Patent ID: 12196164

DETAILED DESCRIPTION

To begin with, examples of relevant techniques will be described. According to a comparative example, a high-pressure pump includes a coil assembly including a coil to open and close an intake valve that adjusts fuel to be sucked into a pressure chamber. The coil assembly is connected to a housing of the high-pressure pump via a cylinder member.

In the high-pressure pump of the comparative example, a yoke of the coil assembly and a fixed core are fixed by welding at an end of the coil assembly facing away from the pressure chamber. On the other hand, at least a gap is formed at a circumferential boundary between an inner peripheral wall of the yoke of the coil assembly and an outer peripheral wall of the cylinder member at an end of the coil assembly facing the pressure chamber. That is, the coil assembly is provided by loose fitting with respect to the cylinder member.

In the high-pressure pump of the comparative example, the coil assembly includes a terminal for energizing the coil. When the high-pressure pump is attached to an internal combustion engine, a portion of the loosely fitted coil assembly at the end facing the pressure chamber may particularly vibrate due to vibration of the internal combustion engine and vibration of the high-pressure pump during operation.

When the coil assembly vibrates, the terminal may vibrate and wear, resulting in poor continuity. As a result, an intake valve portion may have operation malfunction, resulting in unstable discharge of fuel in the high-pressure pump.

In contrast to the comparative example, according to a high-pressure pump of the present disclosure, fuel can be discharged stably.

According to at least one embodiment of the present disclosure, a high-pressure pump includes a pressure chamber forming portion, an intake passage forming portion, a seat member, a valve member, a cylinder member, a needle, a movable core, a fixed core, a coil assembly, a first connection portion and a second connection portion.

The pressure chamber forming portion has a pressure chamber in which fuel is pressurized. The intake passage forming portion has an intake passage through which the fuel flows to be sucked into the pressure chamber. The seat member is arranged in the intake passage and includes a communication passage through which one surface and another surface of the seat member communicate with each other.

The valve member is provided between the seat member and the pressure chamber, and allows or blocks a flow of the fuel through the communication passage by the valve member being separated from the seat member in a valve open state or being in contact with the seat member in a valve closed state. The cylinder member is arranged such that the seat member is between the cylinder member and the pressure chamber.

The needle is reciprocable in an axial direction of the cylinder member inside the cylinder member. The needle has one end movable together with the valve member. The movable core is provided at another end of the needle. The fixed core faces the movable core in an axial direction of the needle.

The coil assembly includes a coil sub-assembly, a first yoke and a second yoke. The coil sub-assembly includes a connector, a terminal provided in the connector, a coil having a cylindrical shape and connected to the terminal, and a resin portion covering the terminal and the coil.

The first yoke is arranged between the coil and the pressure chamber in an axial direction of the coil, and the first yoke forms a magnetic circuit by energization of the coil. The second yoke is arranged such that the coil is between the second yoke and the pressure chamber in the axial direction of the coil, and the second yoke forms a magnetic circuit by energization of the coil.

The first connection portion is arranged such that the coil assembly is between the first connection portion and the pressure chamber. The first connection portion connects the coil assembly and the fixed core. The second connection portion is arranged between the coil assembly and the pressure chamber. The second connection portion connects the coil assembly and the cylinder member.

In the present disclosure, an end of the coil assembly facing away from the pressure chamber is supported by the fixed core via the first connection portion, and another end of the coil assembly facing the pressure chamber is supported by the cylinder member via the second connection portion. That is, both ends of the coil assembly in the axial direction are supported.

Therefore, when the high-pressure pump is attached to an internal combustion engine, vibration of the coil assembly due to vibration of the internal combustion engine and vibration of the high-pressure pump during operation can be reduced. Accordingly, vibration and wear of the terminal can be reduced, and poor continuity can be reduced. As a result, the operation malfunction of an intake valve portion can be reduced, and fuel discharge in the high-pressure pump can be stabilized.

Hereinafter, multiple embodiments for implementing the present disclosure will be described referring to drawings. Among the embodiments, parts that correspond to each other may be assigned the same reference numeral, and redundant explanation for the part may be omitted. When only a part of a configuration is described in an embodiment, explanations of the other parts of the configuration described in another preceding embodiment may be used. Parts may be combined among the embodiments even if it is not explicitly described that the parts can be combined. The embodiments may be partially combined even if it is not explicitly described that the embodiments can be combined, provided there is no harm in the combination.

First Embodiment

FIG.1shows a high-pressure pump according to a first embodiment.

A high-pressure pump10according to the present embodiment is applicable to a fuel supply system including a fuel injection valve that supplies fuel to an internal combustion engine (hereinafter, referred to as “engine”)1of a vehicle (not shown). The high-pressure pump10is attached to, for example, an engine head2of the engine1.

Gasoline or the like as fuel is stored in a fuel tank mounted on the vehicle. A fuel pump pumps up and discharges the fuel in the fuel tank. A fuel supply pipe connects the fuel pump and the high-pressure pump10. Accordingly, the fuel pumped up and discharged by the fuel pump flows into the high-pressure pump10through the fuel supply pipe.

The engine1is provided with a fuel rail together with the high-pressure pump10. The engine1is, for example, a four-cylinder gasoline engine. The fuel rail is provided on the engine head2of the engine1. The fuel injection valve is provided such that a nozzle hole is exposed inside a combustion chamber of the engine1. For example, four fuel injection valves are provided according to the number of cylinders in the engine1. The four fuel injection valves are connected to the fuel rail.

The high-pressure pump10and the fuel rail are connected by a high-pressure fuel pipe8. The fuel that has flowed into the high-pressure pump10from the fuel supply pipe is pressurized by the high-pressure pump10and supplied to the fuel rail through the high-pressure fuel pipe8. Accordingly, the fuel in the fuel rail is kept at a relatively high pressure. The fuel injection valve is opened or closed according to a command from an ECU as a control device (not shown), and injects the fuel in the fuel rail into the combustion chamber of the engine1. As described above, the fuel injection valve is a so-called direct injection type (DI) fuel injection valve.

A sensor is provided on a fuel tank side of the fuel supply pipe with respect to the high-pressure pump10. The sensor can detect a pressure of the fuel in the fuel supply pipe, i.e., a fuel pressure, and a temperature of the fuel, i.e., a fuel temperature, and send corresponding signals to the ECU. The ECU determines a target pressure of the fuel to be discharged from the fuel pump based on the fuel pressure and the fuel temperature in the fuel supply pipe detected by the sensor, and controls operation of a motor of the fuel pump such that the fuel at the target pressure is discharged from the fuel pump.

As shown inFIG.1, the high-pressure pump10includes an upper housing21, a lower housing22, a cylinder23, a holder support portion24, a cover26, a plunger11, an intake valve portion300, an electromagnetic drive portion500, and a discharge passage portion700.

The upper housing21, the lower housing22, the cylinder23, and the holder support portion24are each formed of a metal such as stainless steel. Here, the upper housing21and the lower housing22correspond to a “housing”.

The upper housing21is formed, for example, in a substantially octagonal columnar shape. The upper housing21has an octagonal cylindrical housing outer peripheral wall.

The upper housing21includes a hole portion211, an intake hole portion212, and a discharge hole portion214. The hole portion211is formed to penetrate a center of the upper housing21in a cylindrical shape along an axis of the upper housing21.

The intake hole portion212is formed to extend from the housing outer peripheral wall of the upper housing21toward the hole portion211and to be connected to the hole portion211. An intake passage216is formed inside the intake hole portion212of the upper housing21. Here, the upper housing21corresponds to an “intake passage forming portion”.

The discharge hole portion214is formed to extend toward the hole portion211from a side of the housing outer peripheral wall of the upper housing21opposite to the intake hole portion212and to be connected to the hole portion211. A discharge passage217is formed inside the discharge hole portion214. Here, the discharge hole portion214of the upper housing21corresponds to a “discharge passage forming portion”.

The lower housing22is formed in a substantially disk shape. The lower housing22includes a hole portion221.

The hole portion221is formed to penetrate a center of the lower housing22in a substantially cylindrical shape in a plate thickness direction.

The lower housing22is provided integrally with the upper housing21so as to be fitted into a recess portion formed below the upper housing21.

When the high-pressure pump10is attached to the engine1, the lower housing22is fixed to the engine head2of the engine1by bolts (not shown).

The cylinder23includes a cylinder hole portion231. The cylinder hole portion231is formed in a substantially cylindrical shape so as to extend from one end surface toward the other end surface of a columnar member. That is, the cylinder23is formed in a bottomed cylindrical shape having a cylinder portion and a bottom portion that closes one end of the cylinder portion.

An outer diameter of the cylinder23is slightly larger than an inner diameter of the hole portion211of the upper housing21. The cylinder23passes through the hole portion221of the lower housing22and is provided integrally with the upper housing21and the lower housing22such that an outer peripheral wall on a bottom portion side is fitted into the hole portion211of the upper housing21. The cylinder23includes an intake hole232and a discharge hole233. The intake hole232is formed to connect an end portion of the cylinder hole portion231on a bottom portion side and the intake hole portion212of the upper housing21. The discharge hole233is formed to connect the end portion of the cylinder hole portion231on the bottom portion side and the discharge hole portion214of the upper housing21.

The holder support portion24is formed in a substantially cylindrical shape. The holder support portion24is provided integrally with the lower housing22such that one end of the holder support portion24is fitted into a recess portion formed below the lower housing22. When the high-pressure pump10is attached to the engine1, the holder support portion24is inserted into an attachment hole portion3formed in the engine head2(seeFIG.1).

The plunger11is formed of a metal such as stainless steel in a substantially columnar shape. The plunger11includes a large diameter portion111and a small diameter portion112. An outer diameter of the small diameter portion112is smaller than an outer diameter of the large diameter portion111. The plunger11is provided such that a large diameter portion111side is inserted into the cylinder hole portion231of the cylinder23. A pressure chamber200is provided between a bottom wall and an inner peripheral wall of the cylinder hole portion231and an end portion of the plunger11on the large diameter portion111side. That is, the cylinder23forms the pressure chamber200. Here, the cylinder23corresponds to a “pressure chamber forming portion”. The pressure chamber200is connected to the intake hole232and the discharge hole233.

An outer diameter of the plunger11is formed to be slightly smaller than an inner diameter of the cylinder23, that is, an inner diameter of the cylinder hole portion231. Therefore, the plunger11can axially reciprocate inside the cylinder hole portion231while an outer peripheral wall of the large diameter portion111slides on the inner peripheral wall of the cylinder hole portion231. When the plunger11reciprocates inside the cylinder hole portion231, a capacity of the pressure chamber200increases or decreases. As described above, the plunger11can axially reciprocate inside the cylinder hole portion231such that one end of the plunger11is located in the pressure chamber200.

According to the present embodiment, a seal holder14is provided inside the holder support portion24. The seal holder14is formed of a metal such as stainless steel in a cylindrical shape. The seal holder14is provided such that an outer wall thereof is fitted into an inner wall of the holder support portion24.

A variable capacity chamber201whose capacity changes when the plunger11reciprocates is provided between the seal holder14and a step surface between the large diameter portion111and the small diameter portion112of the plunger11.

Here, an annular space202, which is a space having an annular shape, is formed between the lower housing22, an outer peripheral wall of the cylinder23, an inner peripheral wall of the holder support portion24, and the seal holder14. The annular space202is connected to a hole portion (not shown) penetrating the lower housing22in the plate thickness direction. In addition, the annular space202is connected to the variable capacity chamber201.

A substantially disk-shaped spring seat12is provided at an end portion of the small diameter portion112of the plunger11on a side opposite to the large diameter portion111. A spring13is provided between the seal holder14and the spring seat12. The spring13is, for example, a coil spring, and one end of the spring13is in contact with the spring seat12, and the other end of the spring13is in contact with the seal holder14via a spacer. The spring13urges the plunger11to a side opposite to the pressure chamber200via the spring seat12. When the high-pressure pump10is attached to the engine head2of the engine1, a lifter5is attached to the end portion of the small diameter portion112of the plunger11on the side opposite to the large diameter portion111.

When the high-pressure pump10is attached to the engine1, the lifter5is in contact with a cam4of a camshaft that rotates in conjunction with a drive shaft of the engine1. Accordingly, when the engine1is rotating, the plunger11axially reciprocates due to the rotation of the cam4. At this time, the capacities of the pressure chamber200and the variable capacity chamber201change periodically.

The cover26is formed of a metal such as stainless steel. The cover26includes a cover cylinder portion261and a cover bottom portion262. The cover cylinder portion261is formed in a substantially octagonal cylindrical shape. The cover cylinder portion261has an octagonal cylindrical cover outer peripheral wall.

The cover bottom portion262is provided integrally with the cover cylinder portion261so as to close one end of the cover cylinder portion261. That is, the cover26is formed in a bottomed cylindrical shape. According to the present embodiment, the cover26is provided by, for example, pressing a plate-shaped member. Therefore, the cover26has a relatively small thickness. Since the cover26is not provided with a high-pressure chamber, the thickness of the cover26can be reduced.

The cover26includes a cover hole portion266and a cover hole portion267. The cover hole portion266and the cover hole portion267are each formed in a substantially cylindrical shape so as to connect an inner peripheral wall and an outer peripheral wall, that is, the cover outer peripheral wall of the cover cylinder portion261. The cover hole portion266and the cover hole portion267are formed substantially coaxially so as to face each other with an axis of the cover cylinder portion261sandwiched therebetween.

The cover26accommodates the upper housing21inside, and is provided such that an end portion of the cover cylinder portion261on a side opposite to the cover bottom portion262is in contact with a surface of the lower housing22on an upper housing21side. The cover26forms a fuel chamber260between the upper housing21, the lower housing22, and the cylinder23. Here, the end portion of the cover cylinder portion261and the lower housing22are joined to each other over the entire region in a circumferential direction by, for example, welding. Accordingly, a space between the cover cylinder portion261and the lower housing22is kept liquid-tight. In addition, the cover26is provided such that the cover hole portion266corresponds to the intake hole portion212of the upper housing21and the cover hole portion267corresponds to the discharge hole portion214of the upper housing21.

In this way, the cover26covers at least a part of the cylinder23, the upper housing21, and the lower housing22, and forms the fuel chamber260between the cylinder23, the upper housing21, and the lower housing22.

The cover26is provided with a supply passage portion (not shown). The supply passage portion is formed in a cylindrical shape, and an inner space of the supply passage portion is provided to communicate with the fuel chamber260. The fuel supply pipe is connected to the supply passage portion. Accordingly, the fuel discharged from the fuel pump flows into the fuel chamber260through the fuel supply pipe and the supply passage portion.

The intake valve portion300is provided inside the intake hole portion212of the upper housing21, that is, in the intake passage216. The intake valve portion300includes a seat member31, a stopper35, a valve member40, a spring39, and the like.

The seat member31is formed of a metal such as stainless steel in a substantially disk shape. The seat member31is provided in the intake passage216inside the intake hole portion212. Here, an outer peripheral wall of the seat member31is press-fitted into an inner peripheral wall of the intake hole portion212.

The seat member31includes a communication passage32and a valve seat310. The communication passage32is formed in a substantially cylindrical shape at a center of the seat member31so as to allow communication between one surface and the other surface of the seat member31.

The valve seat310is formed in an annular shape around the communication passage32on a surface of the seat member31at a pressure chamber200side.

The stopper35is formed of a metal such as stainless steel. The stopper35is provided on the pressure chamber200side with respect to the seat member31in the intake passage216.

A part of the intake passage216is formed in the communication passage32of the seat member31. Therefore, the fuel in the fuel chamber260can flow into the pressure chamber200through the intake passage216formed in the communication passage32and the intake hole232.

The valve member40is provided on the pressure chamber200side of the seat member31. The valve member40can reciprocate in an axial direction of the seat member31between the seat member31and the stopper35.

A surface of the valve member40on a seat member31side can come into contact with the surface of the seat member31on the pressure chamber200side, that is, the valve seat310, and a surface of the valve member40on a stopper35side can come into contact with a surface of the stopper35on the seat member31side.

When the surface of the valve member40on the seat member31side is separated from the surface of the seat member31on the pressure chamber200side, that is, the valve seat310, the valve member40can be open to permit the flow of the fuel in the communication passage32, and when the surface of the valve member40on the seat member31side is in contact with the valve seat310, the valve member40can be closed to restrict the flow of the fuel in the communication passage32.

When the valve member40is open, the fuel is permitted to flow in the communication passage32, and the fuel on a fuel chamber260side can flow toward the pressure chamber200through the communication passage32and the intake hole232. In addition, the fuel on the pressure chamber200side can flow toward the fuel chamber260through the intake hole232and the communication passage32. At this time, the fuel flows around the valve member40.

When the valve member40is closed, the fuel is restricted from flowing in the communication passage32, and the fuel on the fuel chamber260side is restricted from flowing toward the pressure chamber200through the communication passage32and the intake hole232. In addition, the fuel on the pressure chamber200side is restricted from flowing toward the fuel chamber260through the intake hole232and the communication passage32.

The spring39is, for example, a coil spring, and is provided between the stopper35and the valve member40. One end of the spring39is in contact with the surface of the stopper35on the seat member31side, and the other end of the spring39is in contact with a surface of the valve member40on the pressure chamber200side. The spring39urges the valve member40toward the seat member31.

The electromagnetic drive portion500is provided to protrude to a radially outer side of the cover outer peripheral wall from the intake hole portion212of the upper housing21through the cover hole portion266of the cover26.

The electromagnetic drive portion500includes a first electromagnetic drive portion501(seeFIG.3) as a “solenoid assembly” and a second electromagnetic drive portion502(seeFIG.2) as a “coil assembly”.

As shown inFIG.3, the first electromagnetic drive portion501as the “solenoid assembly” includes a cylinder member51, a guide member52, a needle53, a spring54as an urging member, a movable core55, a magnetic throttle portion56, a fixed core57, and the like.

The cylinder member51includes a first cylinder portion511, a second cylinder portion512, and a third cylinder portion513. The first cylinder portion511, the second cylinder portion512, and the third cylinder portion513are each formed of, for example, a magnetic material. The first cylinder portion511is formed in a substantially cylindrical shape.

The second cylinder portion512is formed in a cylindrical shape. The second cylinder portion512is formed substantially coaxially and integrally with the first cylinder portion511such that an end portion of the second cylinder portion512is connected to an end portion of the first cylinder portion511. A maximum outer diameter of the second cylinder portion512is smaller than an outer diameter of the end portion of the first cylinder portion511on a second cylinder portion512side.

The third cylinder portion513is formed in a substantially cylindrical shape. The third cylinder portion513is formed substantially coaxially and integrally with the second cylinder portion512such that an end portion of the third cylinder portion513is connected to an end portion of the second cylinder portion512on a side opposite to the first cylinder portion511. An outer diameter of the third cylinder portion513is smaller than the maximum outer diameter of the second cylinder portion512.

A thread is formed on an outer peripheral wall of an end portion of the first cylinder portion511on a side opposite to the second cylinder portion512. A thread groove corresponding to the thread of the first cylinder portion511is formed on an inner peripheral wall of an end portion of the intake hole portion212of the upper housing21on a side opposite to the pressure chamber200.

The cylinder member51is provided such that the thread of the first cylinder portion511is screw-coupled to the thread groove of the upper housing21. Here, an end surface of the first cylinder portion511of the cylinder member51on the pressure chamber200side urges the seat member31and the stopper35toward the pressure chamber200. Therefore, the seat member31and the stopper35are in contact with each other, and an axial movement thereof is restricted.

The first cylinder portion511of the cylinder member51is located inside the cover hole portion266of the cover26. Therefore, an end portion of the first cylinder portion511on the pressure chamber200side is located inside the cover cylinder portion261, and an end portion of the first cylinder portion511on the side opposite to the pressure chamber200, the second cylinder portion512, and the third cylinder portion513are located outside the cover cylinder portion261. An axis of the cylinder member51is orthogonal to an axis Ax1of the cylinder23.

An inner diameter of a portion in the cylinder member51on the pressure chamber200side is larger than an inner diameter of a portion in the cylinder member51on the side opposite to the pressure chamber200. A substantially annular step surface514facing the pressure chamber200is formed inside the cylinder member51. The step surface514is located on the pressure chamber200side slightly with respect to a connection portion between the first cylinder portion511and the second cylinder portion512in an axial direction of the cylinder member51in order to ensure a thickness.

The first cylinder portion511is formed with hole portions515that allows communication between an inner peripheral wall and an outer peripheral wall. The hole portions515are formed at equal intervals in an circumferential direction of the first cylinder portion511. The hole portions515are formed to straddle the cover hole portion266and the fuel chamber260in an axial direction of the first cylinder portion511. Therefore, the fuel in the fuel chamber260can flow into the first cylinder portion511through the hole portions515and flow toward the pressure chamber200through the intake passage216.

A welding ring519is provided on a radially outer side of the first cylinder portion511of the cylinder member51outside the cover26. The welding ring519is formed of, for example, a metal in a substantially cylindrical shape. The welding ring519is provided such that an end portion on the pressure chamber200side expands to the radially outer side, and is in contact with the periphery of the cover hole portion266of the cover outer peripheral wall. The end portion of the welding ring519on the pressure chamber200side is welded to the cover outer peripheral wall over the entire range in the circumferential direction, and a portion of the welding ring519on the side opposite to the pressure chamber200is welded to the outer peripheral wall of the first cylinder portion511over the entire range in the circumferential direction. More specifically, at the end portion of the welding ring519on the pressure chamber200side, a welded portion591, which is formed by melting through welding the welding ring519and the cover26, followed by cooling and solidification, connects the welding ring519and the cover26over the entire range in the circumferential direction. In addition, at the portion of the welding ring519, a welded portion592, which is formed by melting through welding the welding ring519and the cylinder member51, followed by cooling and solidification, connects the welding ring519and the cylinder member51over the entire range in the circumferential direction. Accordingly, the fuel in the fuel chamber260is prevented from leaking to the outside of the cover26through a gap between the cover hole portion266and the outer peripheral wall of the first cylinder portion511. Since a load under a high pressure is received by screws of the cylinder member51, no stress is applied to the welding ring519.

The guide member52is provided inside the first cylinder portion511. The guide member52is formed of, for example, a metal in a substantially columnar shape. The guide member52is fixed inside the first cylinder portion511such that an outer peripheral wall thereof is fitted into the inner peripheral wall of the first cylinder portion511and an outer edge portion of one end surface thereof is in contact with the step surface514of the cylinder member51.

The guide member52has a shaft hole521and a communication hole522. The shaft hole521is formed to axially penetrate a center of the guide member52.

The communication hole522is formed on a radially outer side of the shaft hole521so as to allow communication between a surface on the pressure chamber200side and a surface on the side opposite to the pressure chamber200. The communication hole522allows communication between a space on the pressure chamber200side with respect to the guide member52and a space on the side opposite to the pressure chamber200with respect to the guide member52in a space inside the first cylinder portion511.

The needle53is provided inside the cylinder member51. The needle53is formed of, for example, a metal. The needle53includes a needle body531and a locking portion532. The needle body531is formed in a substantially columnar shape. The locking portion532is provided integrally with the needle body531so as to extend to a radially outer side in a substantially annular shape from an outer peripheral wall of the needle body531.

The needle53is provided such that the needle body531is inserted into the shaft hole521of the guide member52and the locking portion532is located on the pressure chamber200side with respect to the guide member52. An end portion of the needle body531on the pressure chamber200side is located inside the communication passage32of the seat member31and can come into contact with a surface of the valve member40on the side opposite to the pressure chamber200. An end portion of the needle body531on the side opposite to the pressure chamber200is located on the side opposite to the pressure chamber200with respect to an end surface of the third cylinder portion513on a side opposite to the second cylinder portion512.

An outer diameter of a portion of the needle body531corresponding to the shaft hole521is slightly smaller than an inner diameter of the shaft hole521. An outer diameter of the locking portion532is larger than an outer diameter of the shaft hole521. The needle53can axially reciprocate inside the cylinder member51. The outer peripheral wall of the needle body531is slidable with the shaft hole521. Therefore, the guide member52can guide an axial movement of the needle53.

The spring54is, for example, a coil spring, and is provided on the radially outer side of the needle body531. One end of the spring54is in contact with a surface of the guide member52on the pressure chamber200side, and the other end of the spring54is in contact with a surface of the locking portion532on the side opposite to the pressure chamber200. That is, the locking portion532locks the other end of the spring54. The spring54urges the needle53toward the pressure chamber200. In addition, an urging force of the spring54is larger than an urging force of the spring39. Therefore, the spring54urges the valve member40toward the pressure chamber200via the needle53, and presses the surface of the valve member40on the pressure chamber200side against the stopper35. At this time, the valve member40is separated from the valve seat310of the seat member31and is open.

The movable core55is formed of, for example, a magnetic material in a substantially columnar shape. The movable core55has a shaft hole553and a communication hole554. The shaft hole553is formed to axially penetrate a center of the movable core55.

The movable core55is provided integrally with the needle53such that an inner peripheral wall of the shaft hole553is fitted into an outer peripheral wall of the end portion of the needle body531on the side opposite to the pressure chamber200. Here, the movable core55is press-fitted into the needle53and cannot move relative to the needle53.

The communication hole554is formed on a radially outer side of the shaft hole553so as to allow communication between an end surface551on the side opposite to the pressure chamber200and an end surface552on the pressure chamber200side. The communication hole554reduces a fluid resistance during reciprocation of the movable core55and enables the movable core55to move with a high response. In addition, with the communication hole554, the fuel can be supplied to a space between the movable core55and the fixed core57, and occurrence of cavitation erosion can be prevented by preventing a sudden change in pressure.

In the present embodiment, a center of gravity of the needle53and the movable core55that are integrally provided is always located on an axis of the needle53and inside the guide member52from valve opening to valve closing. Therefore, the axial movement of the needle53and the movable core55that are integrally provided can be stabilized.

The magnetic throttle portion56is formed of, for example, a non-magnetic member in a substantially cylindrical shape. An inner diameter and an outer diameter of the magnetic throttle portion56are substantially the same as an inner diameter and the outer diameter of the third cylinder portion513. The magnetic throttle portion56is provided on the side opposite to the pressure chamber200with respect to the cylinder member51so as to be substantially coaxial with the third cylinder portion513. The magnetic throttle portion56and the third cylinder portion513are joined by, for example, welding. More specifically, a welded portion581, which is formed by melting through welding the magnetic throttle portion56and the cylinder member51, followed by cooling and solidification, connects the magnetic throttle portion56and the cylinder member51. Here, the end surface551of the movable core55on the side opposite to the pressure chamber200is located inside the magnetic throttle portion56.

The fixed core57is formed of, for example, a magnetic material. The fixed core57includes a fixed core small diameter portion573and a fixed core large diameter portion574. The fixed core small diameter portion573is formed in a substantially columnar shape. An outer diameter of the fixed core small diameter portion573is slightly larger than the inner diameter of the magnetic throttle portion56. The fixed core small diameter portion573is press-fitted into the magnetic throttle portion56.

The fixed core large diameter portion574is formed in a substantially columnar shape, includes an axial end portion connected to an end portion of the fixed core small diameter portion573so as to be coaxial with the fixed core small diameter portion573, and is provided integrally with the fixed core small diameter portion573. An outer diameter of the fixed core large diameter portion574is larger than the outer diameter of the fixed core small diameter portion573, and is substantially the same as the outer diameter of the magnetic throttle portion56.

The fixed core57is provided on a side of the cylinder member51opposite to the pressure chamber200such that the fixed core small diameter portion573is located inside an end portion of the magnetic throttle portion56on a side opposite to the cylinder member51. The fixed core57and the magnetic throttle portion56are joined by, for example, welding. More specifically, a welded portion582, which is formed by melting through welding the fixed core57and the magnetic throttle portion56, followed by cooling and solidification, connects the fixed core57and the magnetic throttle portion56. Here, an annular step surface between the fixed core small diameter portion573and the fixed core large diameter portion574is in contact with an end surface of the magnetic throttle portion56on the side opposite to the cylinder member51. In addition, an end surface571of the fixed core57on the pressure chamber200side is located on the pressure chamber200side with respect to the end surface of the magnetic throttle portion56on the side opposite to the cylinder member51. In addition, the fixed core57is substantially coaxial with the magnetic throttle portion56. In a state in which the spring54urges the needle53toward the pressure chamber200and the valve member40is separated from the valve seat310, a gap is formed between the end surface571of the fixed core57on the pressure chamber200side and the end surface551of the movable core55on the side opposite to the pressure chamber200.

In this way, the fixed core57is provided to face the movable core55in the axial direction of the needle53.

In the present embodiment, the cylinder member51, the guide member52, the spring54, the needle53, the movable core55, the magnetic throttle portion56, and the fixed core57are sub-assembled so as to be integrally assembled in advance to form the first electromagnetic drive portion501(seeFIG.3).

As shown inFIG.2, the second electromagnetic drive portion502as the “coil assembly” includes a coil sub-assembly650, a yoke641as a “first yoke”, a yoke645as a “second yoke”, an O-ring681, and the like.

The coil sub-assembly650includes a connector65, a terminal651provided in the connector65, a cylindrical coil60connected to the terminal651, and a spool61and a base portion652as “resin portions” with which the terminal651and the coil60are covered.

Specifically, the connector65is formed of a resin in a cylindrical shape. The terminal651is formed of a conductive metal, and has one end located inside the connector65.

The coil60is formed in a cylindrical shape by winding a winding, and is connected to the other end of the terminal651. The spool61is formed of a resin so as to cover the other end side of the terminal651, and both axial ends and a radially inner side of the coil60. The coil60is formed in a cylindrical shape by winding a winding around a cylindrical portion of the spool61.

The base portion652is provided integrally with the connector65by a resin so as to cover a radially outer side of the coil60and both axial ends of the spool61.

In this way, a part of the terminal651and the coil60are covered with the spool61and the base portion652as “resin portions”.

The yoke641is formed of a magnetic material in a plate shape. The yoke641includes a yoke hole portion642. The yoke hole portion642is formed in a substantially cylindrical shape so as to penetrate the yoke641in the plate thickness direction.

The yoke641is provided integrally with the coil sub-assembly650such that one surface thereof is in contact with an end surface of the base portion652in an axial direction of the coil60. Here, the yoke641is provided such that a columnar space inside the spool61and the yoke hole portion642are coaxial with each other.

The yoke645is formed of a magnetic material. The yoke645includes a yoke bottom portion646, a yoke cylinder portion647, and a yoke notch portion648. The yoke bottom portion646is formed in a plate shape. The yoke cylinder portion647is provided integrally with the yoke bottom portion646so as to extend in a cylindrical shape from an outer edge portion of the yoke bottom portion646. The yoke notch portion648is formed by cutting out a part of the yoke cylinder portion647in a circumferential direction.

The yoke645is provided integrally with the yoke641and the coil sub-assembly650in a state in which an end portion of the yoke cylinder portion647on a side opposite to the yoke bottom portion646is in contact with an outer edge portion of one surface of the yoke641while the coil sub-assembly650is sandwiched between the yoke645and the yoke641. The end portion of the yoke cylinder portion647and the yoke641are joined by, for example, welding. More specifically, a welded portion649, which is formed by melting through welding the yoke cylinder portion647and the yoke641, followed by cooling and solidification, connects the yoke cylinder portion647and the yoke641.

Here, the connector65is located on a radially outer side of the yoke645with respect to the yoke notch portion648. A surface of the yoke bottom portion646on a yoke641side is in contact with a surface of the base portion652on a side opposite to the yoke641.

The O-ring681is formed of an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less in an annular shape. The O-ring681is provided between the spool61and the yoke bottom portion646so as to be substantially coaxial with the coil60. The O-ring681is sandwiched between the spool61and the yoke bottom portion646, and is axially compressed. Accordingly, a space between the spool61and the yoke bottom portion646is kept liquid-tight, and water or the like can be prevented from entering the space inside the spool61from the outside of the second electromagnetic drive portion502through the yoke notch portion648.

The electromagnetic drive portion500is formed by assembling the first electromagnetic drive portion501as the “solenoid assembly” shown inFIG.3and the second electromagnetic drive portion502as the “coil assembly” shown inFIG.2.

As shown inFIG.4, the electromagnetic drive portion500includes a welded portion661as a “first connection portion” and an O-ring671as a “second connection portion”.

The welded portion661as the “first connection portion” connects the second electromagnetic drive portion502as the “coil assembly” and the fixed core57on a side of the second electromagnetic drive portion502opposite to the pressure chamber200.

More specifically, the first electromagnetic drive portion501is provided such that an end surface572of the fixed core57on the side opposite to the pressure chamber200is in contact with a surface of the yoke bottom portion646on the pressure chamber200side. The end surface572of the fixed core57and the yoke bottom portion646are joined by welding.

More specifically, the welded portion661, which is formed by melting through welding the yoke bottom portion646and the fixed core57, followed by cooling and solidification, connects the yoke bottom portion646and the fixed core57. Accordingly, the yoke645and the fixed core57cannot move relative to each other. The welded portion661is formed in a continuous annular shape or an intermittent annular shape on the end surface572of the fixed core57. In this way, the welded portion661connects the yoke bottom portion646of the second electromagnetic drive portion502and the fixed core57on the side of the second electromagnetic drive portion502opposite to the pressure chamber200(seeFIG.4).

The O-ring671as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502as the “coil assembly”.

More specifically, the O-ring671is provided in a substantially cylindrical space between the third cylinder portion513of the cylinder member51, a protruding portion615of the spool61, and the base portion652(seeFIG.5).

The O-ring671is formed of an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less in an annular shape. The O-ring671is sandwiched between an outer peripheral wall of the third cylinder portion513of the cylinder member51and inner peripheral walls the protruding portion615of the spool61and the base portion652, and is compressed radially. Accordingly, a space between the outer peripheral wall of the third cylinder portion513of the cylinder member51and the inner peripheral walls of the protruding portion615of the spool61and the base portion652is kept liquid-tight. In this way, the O-ring671connects the spool61and the base portion652as “resin portions” of the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502(seeFIG.4).

In the present embodiment, an outer diameter of the second cylinder portion512of the cylinder member51is smaller than an inner diameter of the yoke hole portion642of the yoke641. Therefore, the cylinder member51is not press-fitted into the yoke hole portion642, and a gap is formed between the second cylinder portion512and the yoke hole portion642in at least a part of the cylinder member51in a circumferential direction.

In the present embodiment, an annular step surface517between the first cylinder portion511and the second cylinder portion512of the cylinder member51and a surface of the yoke641on the pressure chamber200side are separated from each other (seeFIG.5). Therefore, an annular gap is formed between the yoke641and the step surface517of the cylinder member51in the axial direction of the cylinder member51.

A substantially cylindrical gap is formed between outer peripheral walls of the magnetic throttle portion56and the fixed core large diameter portion574and the inner peripheral wall of the spool61.

With the above configuration, the pressure chamber200side of the second electromagnetic drive portion502as the “coil assembly” is supported by the cylinder member51via the O-ring671formed of an elastic member in a radial direction of the cylinder member51. Accordingly, vibration of the engine1and vibration of the high-pressure pump10during operation can be effectively prevented from being transmitted to the second electromagnetic drive portion502via the cylinder member51.

A harness6is connected to the connector65. Accordingly, the terminal651and a female terminal of the harness6are electrically connected to each other, and an electric power is supplied to the coil60via the harness6and the terminal651.

When the second electromagnetic drive portion502as the “coil assembly” vibrates while the terminal651and the female terminal of the harness6are connected to each other, the terminal651and the female terminal of the harness6may slide and wear.

As shown inFIG.4, when the coil60is energized, a magnetic circuit Mc1passing through the fixed core57, the yoke bottom portion646, the yoke cylinder portion647, the yoke641, the second cylinder portion512, and the movable core55is provided in a manner of avoiding the magnetic throttle portion56. Accordingly, an attraction force is generated between the fixed core57and the movable core55, and the movable core55moves toward the fixed core57together with the needle53against the urging force of the spring54. As a result, the valve member40moves toward the seat member31due to the urging force of the spring39and is closed.

In this way, one end of the needle53cooperates with the valve member40.

As described above, by energizing the coil60, the yoke641as the “first yoke” can form the magnetic circuit Mc1on the pressure chamber200side with respect to the coil60in the axial direction of the coil60. In addition, by energizing the coil60, the yoke645as the “second yoke” can form the magnetic circuit Mc1on the side opposite to the pressure chamber200with respect to the coil60in the axial direction of the coil60.

As shown inFIG.5, in the cylinder member51and the yoke641as the “first yoke”, a magnetic path505through which the magnetic circuit Mc1passes is formed by a part of the second cylinder portion512of the cylinder member51and a part of the yoke641that are adjacent to each other in the radial direction of the cylinder member51. The O-ring671as the “second connection portion” is provided on a coil60side with respect to the magnetic path505.

Accordingly, water or the like can be prevented from entering the spool61from the outside of the electromagnetic drive portion500through the gap between the second cylinder portion512of the cylinder member51and the yoke hole portion642of the yoke641.

As shown inFIG.5, the yoke641as the “first yoke” includes a facing portion643facing the base portion652of the coil sub-assembly650in the axial direction of the coil60. The O-ring671as the “second connection portion” is provided on the coil60side with respect to the facing portion643. More specifically, the O-ring671is provided on the coil60side with respect to a virtual plane that passes through the facing portion643and that is orthogonal to an axis of the coil60.

Accordingly, water or the like can be prevented from entering the spool61from the outside of the electromagnetic drive portion500through a space between the yoke notch portion648and the base portion652of the coil sub-assembly650and the facing portion643.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

As shown inFIG.3, first, the O-ring671is provided on a radially outer side of the third cylinder portion513of the cylinder member51in the sub-assembled first electromagnetic drive portion501.

Subsequently, the fixed core57of the first electromagnetic drive portion501provided with the O-ring671is inserted into the yoke hole portion642of the sub-assembled second electromagnetic drive portion502and the spool61.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661(seeFIG.4). Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

When the coil60is not energized, the valve member40is open and the fuel chamber260is in communication with the pressure chamber200. At this time, when the plunger11moves toward the side opposite to the pressure chamber200, the capacity of the pressure chamber200increases, and the fuel in the fuel chamber260flows into the first cylinder portion511through the hole portion515, and the fuel is sucked into the pressure chamber200through the intake hole232. Further, when the plunger11moves toward the pressure chamber200with the valve member40open, the capacity of the pressure chamber200decreases, and the fuel in the pressure chamber200flows toward the valve member40through the intake hole232.

When the coil60is energized while the plunger11is moving toward the pressure chamber200, the valve member40is closed, blocking the flow of the fuel between the fuel chamber260and the pressure chamber200. When the plunger11further moves toward the pressure chamber200with the valve member40closed, the capacity of the pressure chamber200further decreases, and the fuel in the pressure chamber200is pressurized.

In this way, the amount of the fuel to be pressurized in the pressure chamber200is adjusted by closing the valve member40with the electromagnetic drive portion500at any timing when the plunger11is moving toward the pressure chamber200. In the present embodiment, the intake valve portion300and the electromagnetic drive portion500form a normally open type valve device.

As shown inFIG.1, the discharge passage portion700protrudes to the radially outer side of the cover outer peripheral wall from the discharge hole portion214of the upper housing21through the cover hole portion267of the cover26.

The discharge passage portion700includes a discharge joint70, a discharge valve75, a relief valve91, and the like.

The discharge joint70is formed of a metal such as stainless steel in a substantially cylindrical shape. A thread is formed on an outer peripheral wall of a portion separated by a predetermined distance from one end portion toward the other end portion of the discharge joint70. A thread groove corresponding to the thread of the discharge joint70is formed on an inner peripheral wall of the discharge hole portion214of the upper housing21. The discharge joint70is provided such that the thread is screw-coupled to the thread groove of the upper housing21.

The discharge joint70is provided inside the cover hole portion267of the cover26. An end portion of the discharge joint70on the pressure chamber200side is located inside the discharge hole portion214inside the cover cylinder portion261, that is, in the discharge passage217, and an end portion of the discharge joint70on the side opposite to the pressure chamber200is located outside the cover cylinder portion261.

The discharge joint70forms a discharge passage705therein. The fuel discharged from the pressure chamber200flows through the discharge passage705. Here, the discharge joint70corresponds to a “discharge passage forming portion”.

A welding ring709is provided on a radially outer side of the discharge joint70outside the cover26. The welding ring709is formed of, for example, a metal in a substantially cylindrical shape. The welding ring709is provided such that an end portion thereof on the pressure chamber200side expands to the radially outer side, and is in contact with the periphery of the cover hole portion267on the cover outer peripheral wall. The end portion of the welding ring709on the pressure chamber200side is welded to the cover outer peripheral wall over the entire range in the circumferential direction, and a portion of the welding ring709on the side opposite to the pressure chamber200is welded to an outer peripheral wall of the discharge joint70over the entire range in the circumferential direction. Accordingly, the fuel in the fuel chamber260is prevented from leaking to the outside of the cover26through a gap between the cover hole portion267and the outer peripheral wall of the discharge joint70.

The high-pressure fuel pipe8is connected to the end portion of the discharge joint70on the side opposite side to the pressure chamber200. Accordingly, the fuel that has flowed into the fuel chamber260from the fuel supply pipe through the supply passage portion of the high-pressure pump10is pressurized in the pressure chamber200, and is discharged to the high-pressure fuel pipe8through the discharge passage705inside the discharge joint70. The high-pressure fuel discharged to the high-pressure fuel pipe8is supplied to the fuel rail through the high-pressure fuel pipe8.

The discharge valve75and the relief valve91are provided in the discharge passage705inside the discharge joint70.

The discharge valve75in the discharge passage705is open when a differential pressure between the fuel on the pressure chamber200side and the fuel on a high-pressure fuel pipe8side is equal to or larger than a predetermined value with respect to the discharge valve75, and the flow of the fuel in the discharge passage705is permitted. On the other hand, the discharge valve75in the discharge passage705is closed when the differential pressure between the fuel on the pressure chamber200side and the fuel on the high-pressure fuel pipe8side is smaller than the predetermined value with respect to the discharge valve75, and the flow of the fuel in the discharge passage705is restricted.

The relief valve91in the discharge passage705is open when a differential pressure between the fuel on the high-pressure fuel pipe8side and the fuel on the pressure chamber200side is equal to or larger than a predetermined value with respect to the relief valve91, and the flow of the fuel in the discharge passage705is permitted. On the other hand, the relief valve91in the discharge passage705is closed when the differential pressure between the fuel on the high-pressure fuel pipe8side and the fuel on the pressure chamber200side is smaller than the predetermined value with respect to the relief valve91, and the flow of fuel in the discharge passage705is restricted.

When a pressure of the fuel on the high-pressure fuel pipe8side rises to an abnormal value with respect to the relief valve91in the discharge passage705, the relief valve91is open. Therefore, the fuel on the high-pressure fuel pipe8side with respect to the relief valve91in the discharge passage705is returned to the pressure chamber200side. By operating the relief valve91, the pressure of the fuel on the high-pressure fuel pipe8side can be prevented from becoming an abnormal value.

In the present embodiment, the high-pressure pump10further includes a pulsation damper15. The pulsation damper15is provided by, for example, combining two circular disk-shaped metal thin plates and joining outer edge portions thereof by welding. The inside of the pulsation damper15is filled with a gas with a predetermined pressure, such as nitrogen or argon. The pulsation damper15is provided between the cover bottom portion262of the fuel chamber260and the upper housing21.

Next, the attachment of the high-pressure pump10to the engine1will be described.

In the present embodiment, the high-pressure pump10is attached to the engine1such that the holder support portion24is inserted into the attachment hole portion3of the engine head2(seeFIG.1). The high-pressure pump10is fixed to the engine1by fixing the lower housing22to the engine head2with bolts. Here, the high-pressure pump10is attached to the engine1in a posture in which the axis Ax1of the cylinder23extends in a vertical direction.

Next, the operation of the high-pressure pump10according to the present embodiment will be described.

“Intake Process”

When the supply of the electric power to the coil60of the electromagnetic drive portion500is stopped, the valve member40is urged toward the pressure chamber200by the spring54and the needle53. Therefore, the valve member40is separated from the valve seat310, that is, is open. In this state, when the plunger11moves toward the side opposite to the pressure chamber200, the capacity of the pressure chamber200increases, and the fuel on the side opposite to the pressure chamber200with respect to the valve seat310, that is, the fuel chamber260side, is sucked toward the pressure chamber200through the communication passage32.

“Amount Adjustment Process”

When the plunger11moves toward the pressure chamber200with the valve member40opened, the capacity of the pressure chamber200decreases, and the fuel on the pressure chamber200side with respect to the valve seat310is returned toward the fuel chamber260with respect to the valve seat310. When the electric power is supplied to the coil60during an amount adjustment process, the movable core55is attracted toward the fixed core57together with the needle53, and the valve member40is urged by the spring39, comes into contact with the valve seat310, and is closed. When the plunger11moves toward the pressure chamber200, the amount of the fuel returned from the pressure chamber200toward the fuel chamber260is adjusted by closing the valve member40. As a result, the amount of the fuel to be pressurized in the pressure chamber200is determined. When the valve member40is closed, the amount adjustment process of adjusting the amount of the fuel returned the fuel from the pressure chamber200toward the fuel chamber260is completed.

When the fuel injection valve does not inject fuel, that is, during fuel cut, the coil60is not energized, and the discharge amount of the fuel from the high-pressure pump10is 0. At this time, since the valve member40is open, the fuel in the pressure chamber200moves back and forth between the pressure chamber200and the fuel chamber260as the plunger11reciprocates.

“Pressurizing Process”

When the plunger11further moves toward the pressure chamber200with the valve member40closed, the capacity of the pressure chamber200decreases, and the fuel in the pressure chamber200is compressed and pressurized. When the pressure of the fuel in the pressure chamber200is equal to or higher than a valve opening pressure of the discharge valve75, the discharge valve75opens, and the fuel is discharged from the pressure chamber200toward the high-pressure fuel pipe8, that is, toward the fuel rail.

When the supply of the electric power to the coil60is stopped and the plunger11moves to the side opposite to the pressure chamber200, the valve member40opens again. Accordingly, the pressurizing process of pressurizing the fuel is completed, and the intake process of sucking the fuel from the fuel chamber260toward the pressure chamber200is restarted.

By repeating the “intake process”, the “amount adjustment process”, and the “pressurizing process”, the high-pressure pump10pressurizes the fuel in the fuel chamber260sucked into the pressure chamber200and discharges and supplies the pressurized fuel to the fuel rail. The amount of the fuel supplied from the high-pressure pump10to the fuel rail is adjusted by controlling a timing of supplying the electric power to the coil60of the electromagnetic drive portion500or the like.

When the plunger11reciprocates while the valve member40is open in the “intake process”, the “amount adjustment process”, and the like, pressure pulsation caused by the increase or decrease in the capacity of the pressure chamber200may occur in the fuel in the fuel chamber260. The pulsation damper15provided in the fuel chamber260can reduce the pressure pulsation of the fuel in the fuel chamber260by being elastically deformed according to a change in the fuel pressure in the fuel chamber260.

When the plunger11is reciprocating, the pressure pulsation caused by an increase or decrease in the capacity of the variable capacity chamber201may occur. In this case, the pulsation damper15can also reduce the pressure pulsation of the fuel in the fuel chamber260by being elastically deformed according to the change in the fuel pressure in the fuel chamber260.

When the plunger11descends, the capacity of the variable capacity chamber201decreases following a descending speed of the plunger11, and the fuel is pushed out toward the fuel chamber260. As a result, the fuel in the fuel chamber260is easily introduced into the pressure chamber200when the plunger11descends. In addition, when the plunger11rises, the capacity of the variable capacity chamber201increases, and thus the fuel returned from the pressure chamber200during the amount adjustment is easily discharged to the variable capacity chamber201. Due to the above operation, the pulsation of the fuel chamber260is reduced.

When the plunger11reciprocates, the capacity of the variable capacity chamber201increases or decreases, and thus the fuel moves back and forth between the fuel chamber260and the annular space202and between the fuel chamber260and the variable capacity chamber201. Accordingly, the cylinder23and the plunger11, which are heated to a high temperature by heat generated by sliding between the plunger11and the cylinder23and heat generated by the pressurization of the fuel in the pressure chamber200, can be cooled by low-temperature fuel. Accordingly, seizure of the plunger11and the cylinder23can be reduced.

A part of the fuel pressurized in the pressure chamber200flows into the variable capacity chamber201through a clearance between the plunger11and the cylinder23. Accordingly, an oil film is provided between the plunger11and the cylinder23, and the seizure of the plunger11and the cylinder23can be effectively prevented. The fuel that has flowed from the pressure chamber200into the variable capacity chamber201returns to the fuel chamber260through the annular space202.

In the present embodiment, the high-pressure pump10is attached to the engine1and is then for use. Therefore, the lower housing22, the upper housing21, and the like of the high-pressure pump10vibrate due to the vibration of the engine1and the vibration of the high-pressure pump10during operation, and the cylinder member51of the first electromagnetic drive portion501connected to the upper housing21also vibrates. As a result, the vibration may be transmitted to the second electromagnetic drive portion502connected to the upper housing21via the cylinder member51, and the terminal651of the coil sub-assembly650may vibrate.

However, in the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the O-ring671as the “second connection portion” is sandwiched between the first electromagnetic drive portion501and the second electromagnetic drive portion502, and close contact is made such that no gap can be formed after assembly. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502and the fixed core57are connected to each other by the welded portion661as the “first connection portion”, and the coil sub-assembly650of the second electromagnetic drive portion502and the cylinder member51are connected to each other by the O-ring671as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, the yoke641and the yoke645that are exposed to the outside of the second electromagnetic drive portion502are each formed of a material having relatively high corrosion resistance. In addition, water or the like can be prevented from entering the fixed core57side from the outside through the O-ring681, the welded portion661as the “first connection portion”, and the O-ring671as the “second connection portion”. Therefore, corrosion resistance of the yoke641, the yoke645, and the fixed core57can be improved.

In the present embodiment, the O-ring671as the “second connection portion” is provided in an annular space formed between the coil sub-assembly650and the cylinder member51. Therefore, there is no need to change the yoke641and the yoke645as magnetic paths, and the influence on an attraction force can be reduced.

In the present embodiment, by filling the annular space between the coil sub-assembly650and the cylinder member51with the O-ring671as the “second connection portion”, water or the like can be prevented from entering the electromagnetic drive portion500, and the corrosion resistance of the fixed core57or the like can be improved.

As described above, in the present embodiment, the welded portion661as the “first connection portion” connects the second electromagnetic drive portion502and the fixed core57on the side of the second electromagnetic drive portion502as the “coil assembly” opposite to the pressure chamber200. The O-ring671as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

In the present embodiment, the second electromagnetic drive portion502on the side opposite to the pressure chamber200is supported by the fixed core57via the welded portion661, and the second electromagnetic drive portion502on the pressure chamber200side is supported by the cylinder member51via the O-ring671. That is, both axial ends of the second electromagnetic drive portion502are supported by other portions (welded portion661and O-ring671).

Therefore, when the high-pressure pump10is attached to the engine1, the vibration of the second electromagnetic drive portion502due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, the cylinder member51and the yoke641as the “first yoke” form the magnetic path505by a part of the second cylinder portion512of the cylinder member51and a part of the yoke641that are adjacent to each other in the radial direction of the cylinder member51. The O-ring671as the “second connection portion” is provided on a coil60side with respect to the magnetic path505.

Accordingly, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the spool61from the outside of the electromagnetic drive portion500through the gap between the second cylinder portion512of the cylinder member51and the yoke hole portion642of the yoke641. As a result, the fixed core57can be prevented from being corroded.

In the present embodiment, the yoke641as the “first yoke” includes the facing portion643facing the base portion652of the coil sub-assembly650in the axial direction of the coil60. The O-ring671as the “second connection portion” is provided on the coil60side with respect to the facing portion643.

Accordingly, water or the like can be prevented from entering the spool61from the outside of the electromagnetic drive portion500through a space between the yoke notch portion648and the base portion652of the coil sub-assembly650and the facing portion643. As a result, the fixed core57can be effectively prevented from being corroded.

In the present embodiment, the O-ring671as the “second connection portion” is formed of an elastic member in an annular shape.

Therefore, the vibration of the second electromagnetic drive portion502due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be more effectively reduced. In addition, by the O-ring671, the space between the second electromagnetic drive portion502and the cylinder member51can be kept liquid-tight, and the fixed core57or the like inside the space can be prevented from being corroded. Further, the O-ring671can reduce an operating noise of the electromagnetic drive portion500.

Second Embodiment

FIG.6shows a part of a high-pressure pump according to a second embodiment. The second embodiment is different from the first embodiment in the configuration of the second connection portion or the like.

In the present embodiment, the outer peripheral wall of the third cylinder portion513of the cylinder member51on the second cylinder portion512side is formed in a tapered shape so as to approach the axis of the cylinder member51from the second cylinder portion512side toward the magnetic throttle portion56.

The inner peripheral wall of the protruding portion615of the spool61is formed in a tapered shape so as to approach an axis of the spool61from the pressure chamber200side toward the side opposite to the pressure chamber200.

According to the present embodiment, a coating portion672as the “second connection portion” is provided. The coating portion672is formed of an elastic member such as an adhesive, that is, a resin material having an elastic modulus of a predetermined value or less, and is formed in a cylindrical shape so as to cover outer peripheral walls of the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, and the fixed core large diameter portion574of the fixed core57over the entire range in a circumferential direction.

An outer peripheral wall of the coating portion672is in contact with inner peripheral walls of the spool61and the base portion652. Accordingly, the coating portion672connects the spool61and the base portion652of the second electromagnetic drive portion502as the “coil assembly” to the cylinder member51, the magnetic throttle portion56, and the fixed core57. Therefore, the coating portion672connects the spool61and the base portion652to the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502as the “coil assembly”.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

First, the coating portion672is provided so as to cover the outer peripheral walls of the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, and the fixed core large diameter portion574of the fixed core57in the sub-assembled first electromagnetic drive portion501over the entire range in the circumferential direction. At this point, the coating portion672is not cured.

Subsequently, the fixed core57of the first electromagnetic drive portion501provided with the coating portion672is inserted into the yoke hole portion642and the spool61of the sub-assembled second electromagnetic drive portion502. At this point, the coating portion672is also not cured, and the coating portion672is brought into close contact with the inner peripheral walls of the spool61and the base portion652.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661. Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

When a predetermined time elapses after the fixed core57of the first electromagnetic drive portion501is inserted into the second electromagnetic drive portion502, the coating portion672is cured by moisture. In the present embodiment, the coating portion672is formed of a material having elasticity even after being cured.

In the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the outer peripheral walls of the cylinder member51, the magnetic throttle portion56, and the fixed core57in the first electromagnetic drive portion501are coated with the coating portion672formed of a resin, and close contact is made such that no gap can be formed between the first electromagnetic drive portion501and the second electromagnetic drive portion502after assembly. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502and the fixed core57are connected to each other by the welded portion661as the “first connection portion”, and the coil sub-assembly650of the second electromagnetic drive portion502is connected to the cylinder member51, the magnetic throttle portion56, and the fixed core57by the coating portion672as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, the coating portion672as the “second connection portion” is provided in a cylindrical space formed between the coil sub-assembly650and the cylinder member51, the magnetic throttle portion56, and the fixed core57. Therefore, there is no need to change the yoke641and the yoke645as magnetic paths, and the influence on an attraction force can be reduced.

In the present embodiment, by filling the cylindrical space between the coil sub-assembly650and the cylinder member51, the magnetic throttle portion56, and the fixed core57with the coating portion672as the “second connection portion”, water or the like can be prevented from entering the electromagnetic drive portion500, and the corrosion resistance of the fixed core57or the like can be improved.

In the present embodiment, since the coating portion672as the “second connection portion” is formed in a cylindrical shape, a contact area between the coating portion672and the coil sub-assembly650of the second electromagnetic drive portion502, the cylinder member51of the first electromagnetic drive portion501, and the like can be easily increased. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be more effectively reduced.

As described above, in the present embodiment, the coating portion672as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

Therefore, as in the first embodiment, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, a part of the coating portion672as the “second connection portion” is provided on the coil60side with respect to the magnetic path505.

In the present embodiment, a part of the coating portion672as the “second connection portion” is provided on the coil60side with respect to the facing portion643.

Therefore, as in the first embodiment, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the spool61from the outside of the electromagnetic drive portion500. As a result, the fixed core57can be effectively prevented from being corroded.

In the present embodiment, the coating portion672as the “second connection portion” is formed of an elastic member in a cylindrical shape, that is, an annular shape.

Therefore, as in the first embodiment, the vibration of the second electromagnetic drive portion502due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be more effectively reduced. In addition, by the coating portion672, the space between the second electromagnetic drive portion502and the cylinder member51can be kept liquid-tight, and the fixed core57or the like inside the space can be prevented from being corroded. Further, the coating portion672can reduce an operating noise of the electromagnetic drive portion500.

Third Embodiment

FIG.7shows a part of a high-pressure pump according to a third embodiment. The third embodiment is different from the second embodiment in the configuration of the second connection portion or the like.

In the present embodiment, a plate rubber673as the “second connection portion” is provided.

The plate rubber673is formed of an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less, in an annular plate shape.

The plate rubber673connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

The plate rubber673is provided between the yoke641and the cylinder member51in the axial direction of the cylinder member51.

More specifically, an inner diameter of the plate rubber673is substantially the same as the outer diameter of the second cylinder portion512of the cylinder member51. The plate rubber673is provided between the step surface517and the surface of the yoke641on the pressure chamber200side in a radially outer side of the second cylinder portion512of the cylinder member51.

The plate rubber673is sandwiched between the step surface517and the surface of the yoke641on the pressure chamber200side, and is axially compressed. Accordingly, a space between the step surface517of the cylinder member51and the yoke641is kept liquid-tight, and water or the like can be prevented from entering a space inside the electromagnetic drive portion500from the outside of the electromagnetic drive portion500through the space between the step surface517and the yoke641.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

First, the plate rubber673is provided on the radially outer side of the second cylinder portion512of the cylinder member51of the sub-assembled first electromagnetic drive portion501.

Subsequently, the fixed core57of the first electromagnetic drive portion501provided with the plate rubber673is inserted into the yoke hole portion642and the spool61of the sub-assembled second electromagnetic drive portion502.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661. Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

After the first electromagnetic drive portion501and the second electromagnetic drive portion502are assembled, the plate rubber673is axially compressed.

In the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the plate rubber673as the “second connection portion” is sandwiched between the step surface517of the cylinder member51of the first electromagnetic drive portion501and the yoke641of the second electromagnetic drive portion502, and close contact is made such that no gap can be formed in the axial direction of the cylinder member51. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502and the fixed core57are connected to each other by the welded portion661as the “first connection portion”, and the yoke641of the second electromagnetic drive portion502and the cylinder member51are connected to each other by the plate rubber673as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, the plate rubber673as the “second connection portion” is provided in the annular gap formed between the yoke641and the step surface517of the cylinder member51. Therefore, there is no need to change the yoke641and the yoke645as magnetic paths, and the influence on an attraction force can be reduced.

In the present embodiment, by filling the annular gap between the yoke641and the step surface517of the cylinder member51with the plate rubber673as the “second connection portion”, water or the like can be prevented from entering the electromagnetic drive portion500, and the corrosion resistance of the fixed core57or the like can be improved.

In the present embodiment, the plate rubber673as the “second connection portion” is provided at a position visible from the outside. Therefore, the occurrence of shortages and process omissions can be reduced.

As described above, in the present embodiment, the plate rubber673as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

Therefore, as in the second embodiment, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, the plate rubber673as the “second connection portion” is provided between the yoke641as the “first yoke” and the cylinder member51in the axial direction of the cylinder member51.

Accordingly, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the electromagnetic drive portion500from the outside of the electromagnetic drive portion500. As a result, the fixed core57or the like can be prevented from being corroded.

In the present embodiment, the plate rubber673as the “second connection portion” is formed of an elastic member in an annular shape.

Therefore, as in the second embodiment, the vibration of the second electromagnetic drive portion502due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be more effectively reduced. In addition, by the plate rubber673, the space between the second electromagnetic drive portion502and the cylinder member51can be kept liquid-tight, and the fixed core57or the like inside the space can be prevented from being corroded. Further, the plate rubber673can reduce an operating noise of the electromagnetic drive portion500.

Fourth Embodiment

FIG.8shows a part of a high-pressure pump according to a fourth embodiment. The fourth embodiment is different from the third embodiment in the configuration of the second connection portion or the like.

In the present embodiment, a contact surface674as the “second connection portion” is provided.

The contact surface674is provided between the yoke641and the cylinder member51in the axial direction of the cylinder member51.

More specifically, the contact surface674is a contact surface between the yoke641and the step surface517of the cylinder member51in the axial direction of the cylinder member51, and is formed in an annular shape.

More specifically, the contact surface674is a contact surface between the surface of the yoke641on the pressure chamber200side and the step surface517of the cylinder member51in the axial direction of the cylinder member51, and is formed in an annular planar shape.

The contact surface674connects the surface of the yoke641on the pressure chamber200side and the step surface517of the cylinder member51.

That is, the contact surface674connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

An axial force having a predetermined magnitude along the axial direction of the cylinder member51is applied to the contact surface674. Accordingly, a space between the step surface517of the cylinder member51and the yoke641is kept liquid-tight, and water or the like can be prevented from entering a space inside the electromagnetic drive portion500from the outside of the electromagnetic drive portion500through the space between the step surface517and the yoke641.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

First, the fixed core57of the sub-assembled first electromagnetic drive portion501is inserted into the yoke hole portion642and the spool61of the sub-assembled second electromagnetic drive portion502.

Subsequently, the step surface517of the cylinder member51and the surface of the yoke641on the pressure chamber200side are brought into contact with each other, and the first electromagnetic drive portion501is further pushed into the second electromagnetic drive portion502.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661. Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

After the first electromagnetic drive portion501and the second electromagnetic drive portion502are assembled, the axial force having a predetermined magnitude along the axial direction of the cylinder member51is applied to the contact surface674.

In the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the step surface517of the cylinder member51of the first electromagnetic drive portion501and the yoke641of the second electromagnetic drive portion502are brought into contact with each other, and close contact is made such that no gap is formed in the axial direction of the cylinder member51, thereby forming the annular contact surface674. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502is connected to the fixed core57by the welded portion661as the “first connection portion”, and the yoke641of the second electromagnetic drive portion502is connected to the cylinder member51by the contact surface674as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, by filling the annular gap between the yoke641and the step surface517of the cylinder member51with the contact surface674as the “second connection portion”, that is, by eliminating the gap, water or the like can be prevented from entering the electromagnetic drive portion500, and corrosion resistance of the fixed core57or the like can be improved.

In the present embodiment, as in the first to third embodiments, the number of components can be reduced without requiring a separate component as the “second connection portion”.

As described above, in the present embodiment, the contact surface674as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

Therefore, as in the third embodiment, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, the contact surface674as the “second connection portion” is provided between the yoke641as the “first yoke” and the cylinder member51in the axial direction of the cylinder member51.

Accordingly, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the electromagnetic drive portion500from the outside of the electromagnetic drive portion500. As a result, the fixed core57or the like can be prevented from being corroded.

In the present embodiment, the contact surface674as the “second connection portion” is a contact surface between the cylinder member51and the yoke641as the “first yoke” in the axial direction of the cylinder member51and is formed in an annular shape.

Therefore, the vibration of the second electromagnetic drive portion502can be more effectively reduced. In addition, water or the like can be more effectively prevented from entering the electromagnetic drive portion500from the outside of the electromagnetic drive portion500.

Fifth Embodiment

FIG.9shows a part of a high-pressure pump according to a fifth embodiment. The fifth embodiment is different from the third embodiment in the configuration of the second connection portion or the like.

In the present embodiment, the outer diameter of the second cylinder portion512of the cylinder member51is larger than the inner diameter of the yoke hole portion642of the yoke641. The second cylinder portion512of the cylinder member51is press-fitted into the yoke hole portion642.

In the present embodiment, a contact surface675as the “second connection portion” is provided.

The contact surface675is a contact surface between the yoke641and the cylinder member51in the radial direction of the cylinder member51, and is formed in an annular shape.

More specifically, the contact surface675is a contact surface between an inner peripheral wall of the yoke hole portion642of the yoke641and an outer peripheral wall of the second cylinder portion512of the cylinder member51in the radial direction of the cylinder member51, and is formed in a cylindrical shape.

The contact surface675connects the inner peripheral wall of the yoke hole portion642of the yoke641and the outer peripheral wall of the second cylinder portion512of the cylinder member51.

That is, the contact surface675connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

A force having a predetermined magnitude along the radial direction of the cylinder member51is applied to the contact surface675. Accordingly, a space between the outer peripheral wall of the second cylinder portion512of the cylinder member51and the inner peripheral wall of the yoke hole portion642of the yoke641is kept liquid-tight, and water or the like can be prevented from entering the space inside the electromagnetic drive portion500from the outside of the electromagnetic drive portion500through a space between the cylinder member51and the yoke641.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

First, the fixed core57of the sub-assembled first electromagnetic drive portion501is inserted into the yoke hole portion642and the spool61of the sub-assembled second electromagnetic drive portion502.

Subsequently, the outer peripheral wall of the second cylinder portion512of the cylinder member51and the inner peripheral wall of the yoke hole portion642of the yoke641are brought into contact with each other and slid with each other by press fitting, and the first electromagnetic drive portion501is pushed into the second electromagnetic drive portion502.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661. Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

After the first electromagnetic drive portion501and the second electromagnetic drive portion502are assembled, the force having a predetermined magnitude along the radial direction of the cylinder member51is applied to the contact surface675.

In the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the second cylinder portion512of the cylinder member51of the first electromagnetic drive portion501is press-fitted into the yoke hole portion642of the yoke641of the second electromagnetic drive portion502, and close contact is made such that no gap can be formed between the outer peripheral wall of the second cylinder portion512and the inner peripheral wall of the yoke hole portion642in the radial direction of the cylinder member51, thereby forming the cylindrical contact surface675. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502is connected to the fixed core57by the welded portion661as the “first connection portion”, and the yoke641of the second electromagnetic drive portion502is connected to the cylinder member51by the contact surface675as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, the contact surface675as the “second connection portion” is provided between the inner peripheral wall of the yoke hole portion642of the yoke641and the outer peripheral wall of the second cylinder portion512of the cylinder member51. Therefore, there is no need to change the yoke641and the yoke645as magnetic paths, and the influence on an attraction force can be reduced.

In the present embodiment, by filling a cylindrical gap between the yoke hole portion642of the yoke641and the second cylinder portion512of the cylinder member51with the contact surface675as the “second connection portion”, that is, by eliminating the gap, water or the like can be prevented from entering the electromagnetic drive portion500, and corrosion resistance of the fixed core57or the like can be improved.

As described above, in the present embodiment, the contact surface675as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

Therefore, as in the third embodiment, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, the contact surface675as the “second connection portion” is a contact surface between the yoke641and the cylinder member51in the radial direction of the cylinder member51and is formed in an annular shape.

Accordingly, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the electromagnetic drive portion500from the outside of the electromagnetic drive portion500. As a result, the fixed core57or the like can be prevented from being corroded.

Sixth Embodiment

FIG.10shows a part of a high-pressure pump according to a sixth embodiment. The sixth embodiment is different from the third embodiment in the configuration of the second connection portion or the like.

In the present embodiment, a sealing portion676as the “second connection portion” is provided.

The sealing portion676is formed of an elastic member such as a resin, that is, a resin material having an elastic modulus of a predetermined value or less in an annular shape.

The sealing portion676connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

The sealing portion676is provided between the yoke641and the cylinder member51in the axial direction of the cylinder member51.

More specifically, the sealing portion676is provided between the step surface517and the surface of the yoke641on the pressure chamber200side on the radially outer side of the second cylinder portion512of the cylinder member51.

The sealing portion676is provided on a radially outer side of the cylinder member51so as to seal the annular gap between the step surface517and the surface of the yoke641on the pressure chamber200side. Accordingly, a space between the step surface517of the cylinder member51and the yoke641is kept liquid-tight, and water or the like can be prevented from entering a space inside the electromagnetic drive portion500from the outside of the electromagnetic drive portion500through the space between the step surface517and the yoke641.

Next, a method for assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502will be described.

First, the fixed core57of the sub-assembled first electromagnetic drive portion501is inserted into the yoke hole portion642and the spool61of the sub-assembled second electromagnetic drive portion502.

Subsequently, the end surface572of the fixed core57and the yoke bottom portion646are brought into contact with each other, and the fixed core57and the yoke bottom portion646are welded to form the welded portion661.

Subsequently, the annular gap between the step surface517and the surface of the yoke641on the pressure chamber200side is sealed by the sealing portion676. Specifically, the gap is filled with a melted resin material and the melted resin material is cooled and solidified to form the sealing portion676. Accordingly, the assembly of the first electromagnetic drive portion501and the second electromagnetic drive portion502is completed.

After the first electromagnetic drive portion501and the second electromagnetic drive portion502are assembled, the sealing portion676has elasticity.

In the present embodiment, when assembling the first electromagnetic drive portion501and the second electromagnetic drive portion502, the sealing portion676as the “second connection portion” is provided between the step surface517of the cylinder member51of the first electromagnetic drive portion501and the yoke641of the second electromagnetic drive portion502, and close contact is made such that no gap can be formed in the axial direction of the cylinder member51. In addition, after the assembly, the yoke645of the second electromagnetic drive portion502is connected to the fixed core57by the welded portion661as the “first connection portion”, and the yoke641of the second electromagnetic drive portion502is connected to the cylinder member51by the sealing portion676as the “second connection portion”. Therefore, the vibration of the terminal651due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be reduced. Accordingly, wear of the terminal651can be reduced, and poor continuity can be reduced.

In the present embodiment, the sealing portion676as the “second connection portion” is provided in the annular gap formed between the yoke641and the step surface517of the cylinder member51. Therefore, there is no need to change the yoke641and the yoke645as magnetic paths, and the influence on an attraction force can be reduced.

In the present embodiment, by filling the annular gap between the yoke641and the step surface517of the cylinder member51with the sealing portion676as the “second connection portion”, water or the like can be prevented from entering the electromagnetic drive portion500, and corrosion resistance of the fixed core57or the like can be improved.

In the present embodiment, the sealing portion676as the “second connection portion” is provided at a position visible from the outside. Therefore, the occurrence of shortages and process omissions can be reduced.

As described above, in the present embodiment, the sealing portion676as the “second connection portion” connects the second electromagnetic drive portion502and the cylinder member51on the pressure chamber200side of the second electromagnetic drive portion502.

Therefore, as in the third embodiment, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. As a result, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be stabilized.

In the present embodiment, the sealing portion676as the “second connection portion” is provided between the yoke641as the “first yoke” and the cylinder member51in the axial direction of the cylinder member51.

Accordingly, the vibration of the second electromagnetic drive portion502can be effectively reduced while ensuring a cross-sectional area of a magnetic circuit. In addition, water or the like can be prevented from entering the electromagnetic drive portion500from the outside of the electromagnetic drive portion500. As a result, the fixed core57or the like can be prevented from being corroded.

In the present embodiment, the sealing portion676as the “second connection portion” is formed of an elastic member in an annular shape.

Therefore, as in the third embodiment, the vibration of the second electromagnetic drive portion502due to the vibration of the engine1and the vibration of the high-pressure pump10during operation can be more effectively reduced. In addition, by the sealing portion676, the space between the second electromagnetic drive portion502and the cylinder member51can be kept liquid-tight, and the fixed core57or the like inside the space can be prevented from being corroded. Further, the sealing portion676can reduce an operating noise of the electromagnetic drive portion500.

Seventh Embodiment

FIG.11shows a part of a high-pressure pump according to a seventh embodiment. The seventh embodiment is different from the first embodiment in that a “third connection portion” is further provided.

In the present embodiment, an O-ring691as the “third connection portion” is further provided. The O-ring691connects the yoke641as the “first yoke” and the base portion652as the “resin portion”.

More specifically, the O-ring691is provided in a seal groove portion640formed in the yoke641. The seal groove portion640is formed so as to be recessed in an annular shape from a surface of the yoke641on a base portion652side.

The O-ring691is formed of an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less in an annular shape. The O-ring691is sandwiched between a bottom surface of the seal groove portion640and a surface of the base portion652on the yoke641side, and is axially compressed. Accordingly, a space between the seal groove portion640of the yoke641and the surface of the base portion652on the yoke641side is kept liquid-tight.

As described above, in the present embodiment, the O-ring691as the “third connection portion” is further provided. The O-ring691connects the yoke641as the “first yoke” and the base portion652as the “resin portion”. In addition, in the present embodiment, the O-ring691is formed of an elastic member.

In the present embodiment, the upper housing21of the high-pressure pump10vibrates due to the vibration of the engine1, and the electromagnetic drive portion500fixed to the upper housing21also vibrates. In the present embodiment, the O-ring691as the “third connection portion” is additionally provided in the seal groove portion640formed in a contact portion between the base portion652of the coil sub-assembly650and the yoke641, and the base portion652and the yoke641are brought into close contact with each other. Therefore, the vibration to be transmitted to the second electromagnetic drive portion502as the “coil assembly” can be reduced. Accordingly, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. Therefore, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be further stabilized.

When a gap is formed in the contact portion between the base portion652of the coil sub-assembly650and the yoke641, the gap may become a path for water to enter the fixed core57or the like inside the second electromagnetic drive portion502from the outside. In the present embodiment, by filling the contact portion between the base portion652of the coil sub-assembly650and the yoke641with the O-ring691as the “third connection portion”, water can be prevented from entering the contact portion, and corrosion resistance of the fixed core57or the like can be further improved.

Eighth Embodiment

FIG.12shows a part of a high-pressure pump according to an eighth embodiment. The eighth embodiment is different from the seventh embodiment in the arrangement of the “third connection portion” or the like.

In the present embodiment, no seal groove portion640is formed in the yoke641. A seal groove portion653is formed in the base portion652. The seal groove portion653is formed to be recessed in an annular shape from the surface of the base portion652on the yoke641side. The O-ring691as the “third connection portion” is provided in the seal groove portion653.

The O-ring691is sandwiched between a bottom surface of the seal groove portion653and the surface of the yoke641on the base portion652side, and is axially compressed. Accordingly, a space between the seal groove portion653of the base portion652and the surface of the yoke641on the base portion652side is kept liquid-tight.

In the present embodiment, as in the seventh embodiment, the O-ring691as the “third connection portion” can prevent vibration and wear of the terminal651and prevent poor continuity. In addition, by filling the contact portion between the base portion652of the coil sub-assembly650and the yoke641with the O-ring691as the “third connection portion”, water can be prevented from entering the contact portion.

In the present embodiment, as compared with the seventh embodiment, there is no change in a magnetic material for forming the seal groove portion640in the yoke641or the like, and thus the influence on an attraction force for the movable core55can be reduced.

Ninth Embodiment

FIG.13shows a part of a high-pressure pump according to a ninth embodiment. The ninth embodiment is different from the seventh embodiment in the configuration of the “third connection portion” or the like.

In the present embodiment, no seal groove portion640is formed in the yoke641. The “third connection portion” is an adhesive692. The adhesive692is formed of, for example, a resin material having an elastic modulus of a predetermined value or less in an annular plate shape. In the present embodiment, during assembly of the second electromagnetic drive portion502, before the yoke641is brought into contact with the yoke cylinder portion647of the yoke645, a surface of the base portion652on a side opposite to the yoke bottom portion646is coated with the adhesive692. Subsequently, the yoke641is brought into contact with the yoke cylinder portion647. At this point, the adhesive692is not cured, and the adhesive692is brought into close contact with the surface of the base portion652on the yoke641side and the surface of the yoke641on the base portion652side.

Subsequently, the yoke641and the yoke cylinder portion647are welded to form the welded portion649. Accordingly, the assembly, that is, sub-assembly of the second electromagnetic drive portion502is completed. Thereafter, when a predetermined time elapses, the adhesive692is cured by moisture. In the present embodiment, the adhesive692is formed of a material having elasticity even after being cured.

In the present embodiment, as in the seventh embodiment, the adhesive692as the “third connection portion” can prevent the vibration and the wear of the terminal651and prevent the poor continuity. In addition, by filling the contact portion between the base portion652of the coil sub-assembly650and the yoke641with the adhesive692as the “third connection portion”, water can be prevented from entering the contact portion.

In the present embodiment, as in the eighth embodiment, as compared with the seventh embodiment, there is no change in a magnetic material for forming the seal groove portion640in the yoke641or the like, and thus the influence on an attraction force for the movable core55can be reduced.

Tenth Embodiment

FIG.14shows a part of a high-pressure pump according to a tenth embodiment. The tenth embodiment is different from the seventh embodiment in the configuration of the “third connection portion” or the like.

In the present embodiment, no seal groove portion640is formed in the yoke641. The “third connection portion” is a rubber plate693. The rubber plate693is formed of an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less in an annular plate shape. In the present embodiment, during assembly of the second electromagnetic drive portion502, before the yoke641is brought into contact with the yoke cylinder portion647of the yoke645, the rubber plate693is provided on the surface of the base portion652on the side opposite to the yoke bottom portion646. Subsequently, the yoke641is brought into contact with the yoke cylinder portion647. Accordingly, the rubber plate693is in close contact with the surface of the base portion652on the yoke641side and the surface of the yoke641on the base portion652side.

Subsequently, the yoke641and the yoke cylinder portion647are welded to form the welded portion649. Accordingly, the assembly, that is, sub-assembly of the second electromagnetic drive portion502is completed.

In the present embodiment, as in the seventh embodiment, the rubber plate693as the “third connection portion” can prevent the vibration and the wear of the terminal651and prevent the poor continuity. In addition, by filling the contact portion between the base portion652of the coil sub-assembly650and the yoke641with the rubber plate693as the “third connection portion”, water can be prevented from entering the contact portion.

In the present embodiment, as in the ninth embodiment, as compared with the seventh embodiment, there is no change in a magnetic material for forming the seal groove portion640in the yoke641or the like, and thus the influence on an attraction force for the movable core55can be reduced.

Eleventh Embodiment

FIG.15shows a part of a high-pressure pump according to an eleventh embodiment. The eleventh embodiment is different from the seventh embodiment in the configuration of the “third connection portion” or the like.

In the present embodiment, no seal groove portion640is formed in the yoke641. The “third connection portion” is a gasket694. The gasket694is formed of an elastic member such as a relatively soft metal, that is, a metal material having an elastic modulus of a predetermined value or less in an annular plate shape. In the present embodiment, during assembly of the second electromagnetic drive portion502, before the yoke641is brought into contact with the yoke cylinder portion647of the yoke645, the gasket694is provided on the surface of the base portion652on the side opposite to the yoke bottom portion646. Subsequently, the yoke641is brought into contact with the yoke cylinder portion647. Accordingly, the gasket694is in close contact with the surface of the base portion652on the yoke641side and the surface of the yoke641on the base portion652side.

Subsequently, the yoke641and the yoke cylinder portion647are welded to form the welded portion649. Accordingly, the assembly, that is, sub-assembly of the second electromagnetic drive portion502is completed.

In the present embodiment, as in the seventh embodiment, the gasket694as the “third connection portion” can prevent the vibration and the wear of the terminal651and prevent the poor continuity. In addition, by filling the contact portion between the base portion652of the coil sub-assembly650and the yoke641with the gasket694as the “third connection portion”, water can be prevented from entering the contact portion.

In the present embodiment, as in the ninth embodiment, as compared with the seventh embodiment, there is no change in a magnetic material for forming the seal groove portion640in the yoke641or the like, and thus the influence on an attraction force for the movable core55can be reduced.

Twelfth Embodiment

FIG.16shows a part of a high-pressure pump according to a twelfth embodiment. The twelfth embodiment is different from the first embodiment in that an “additional connection portion” is further provided.

In the present embodiment, a filler695as an “additional connection portion” is further provided. The filler695connects the cylinder member51and the fixed core57to the second electromagnetic drive portion502as the “coil assembly”.

More specifically, a space between the second cylinder portion512and the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, the fixed core57, the yoke hole portion642of the yoke641, the base portion652, the O-ring671, the spool61, the O-ring681, and the yoke bottom portion646is filled with the filler695.

The filler695is formed of, for example, an elastic member such as a silicone resin or silicone rubber containing a polymer silicone as a main component, that is, a resin material having an elastic modulus of a predetermined value or less. As described above, the space between the second cylinder portion512and the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, the fixed core57, the yoke hole portion642of the yoke641, the base portion652, the O-ring671, the spool61, the O-ring681, and the yoke bottom portion646is filled with the filler695, and thus the members are in close contact with each other. Accordingly, a space between the cylinder member51and the fixed core57and the second electromagnetic drive portion502as the “coil assembly” is kept liquid-tight.

In the present embodiment, the yoke645is formed with an injection port644. The injection port644is formed to penetrate the yoke bottom portion646in the plate thickness direction. The injection port644is formed at a position corresponding to an outer edge portion of the end surface572of the fixed core57on the side opposite to the pressure chamber200.

In the present embodiment, by welding the fixed core57and the yoke bottom portion646to form the welded portion661, the first electromagnetic drive portion501and the second electromagnetic drive portion502are assembled, and then the filler695in a liquid state is injected from the injection port644to fill the space between the second cylinder portion512and the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, the fixed core57, the yoke hole portion642of the yoke641, the base portion652, the O-ring671, the spool61, the O-ring681, and the yoke bottom portion646. When a predetermined time elapses after filling using the filler695, the filler695is cured. In the present embodiment, the filler695is formed of a material having elasticity even after being cured.

As described above, in the present embodiment, the filler695as the “additional connection portion” is further provided. The filler695connects the cylinder member51and the fixed core57to the second electromagnetic drive portion502as the “coil assembly”. In addition, in the present embodiment, the filler695is formed of an elastic member.

In the present embodiment, the upper housing21of the high-pressure pump10vibrates due to the vibration of the engine1, and the electromagnetic drive portion500fixed to the upper housing21also vibrates. In the present embodiment, the filler695is injected from the injection port644formed in the yoke645, and a part of the fixed core57and the cylinder member51is covered with the filler695, and thus the first electromagnetic drive portion501and the second electromagnetic drive portion502are brought into close contact with each other. Therefore, the vibration to be transmitted to the second electromagnetic drive portion502as the “coil assembly” can be reduced. Accordingly, the vibration and the wear of the terminal651can be reduced, and the poor continuity can be reduced. Therefore, operation malfunction of the intake valve portion300can be reduced, and the fuel discharge of the high-pressure pump10can be further stabilized.

When a gap is formed between the yoke bottom portion646and the fixed core57in the welded portion661or between the cylinder member51and the yoke hole portion642, the gap may become a path for water to enter the fixed core57or the like inside the second electromagnetic drive portion502from the outside. In the present embodiment, by filling the space between the second cylinder portion512and the third cylinder portion513of the cylinder member51, the magnetic throttle portion56, the fixed core57, the yoke hole portion642of the yoke641, the base portion652, the O-ring671, the spool61, the O-ring681, and the yoke bottom portion646with the filler695, water can be prevented from entering the space, and the corrosion resistance of the fixed core57or the like can be further improved.

Thirteenth Embodiment

FIG.17shows a part of a high-pressure pump according to a thirteenth embodiment. The thirteenth embodiment is different from the first embodiment in the configuration of the supply passage portion or the like.

In the present embodiment, a supply passage portion80is provided. The supply passage portion80includes a passage portion body81, supply holes82, a thread portion83, and a thread portion84. The passage portion body81is formed of a metal such as stainless steel in a cylindrical shape having a relatively large thickness. The supply holes82are each formed in a circular shape so as to allow communication between the inside and the outside of the passage portion body81. Four supply holes82are formed at equal intervals in a circumferential direction of the passage portion body81. The thread portion83is formed as a thread on an outer peripheral wall of the passage portion body81at one end. The thread portion84is formed as a thread on an outer peripheral wall of the passage portion body81at the other end.

The cover26is provided with a cover hole portion265. The cover hole portion265is formed in a circular shape so as to allow communication between the outside and the inside of the cover cylinder portion261. The upper housing21is formed with a housing hole portion218. The housing hole portion218is formed at a position corresponding to the cover hole portion265so as to be recessed in a circular shape from the outer peripheral wall of the upper housing21. The housing hole portion218is formed with a housing-side thread portion219. The housing-side thread portion219is formed as a thread groove in an inner peripheral wall of the housing hole portion218.

The supply passage portion80is provided in the upper housing21such that the passage portion body81is inserted into the cover hole portion265and the thread portion84is screw-coupled to the housing-side thread portion219.

A welding ring819is provided on a radially outer side of the passage portion body81outside the cover26. The welding ring819is formed of, for example, a metal in a substantially cylindrical shape. The welding ring819is provided such that an end portion thereof on a cover26side expands to the radially outer side, and is in contact with the periphery of the cover hole portion265of the cover outer peripheral wall. The end portion of the welding ring819on the cover26side is welded to the cover outer peripheral wall over the entire range in the circumferential direction, and a portion of the welding ring819on a side opposite to the cover26is welded to the outer peripheral wall of the passage portion body81over the entire range in the circumferential direction. More specifically, at the end portion of the welding ring819on the cover26side, a welded portion891, which is formed by melting the welding ring819and the cover26through welding, followed by cooling and solidification, connects the welding ring819and the cover26over the entire range in the circumferential direction. In addition, at an end portion of the welding ring819on the side opposite to the cover26, a welded portion892, which is formed by melting the welding ring819and the passage portion body81through welding, followed by cooling and solidification, connects the welding ring819and the passage portion body81over the entire range in the circumferential direction. Accordingly, the fuel in the fuel chamber260is prevented from leaking to the outside of the cover26through a gap between the cover hole portion265and the outer peripheral wall of the passage portion body81.

A fuel supply pipe (not shown) is connected to the supply passage portion80. The fuel supply pipe is, for example, a steel pipe, and is formed with a thread groove in an inner peripheral wall of an end portion on a side opposite to the fuel pump. The thread groove at the end portion of the fuel supply pipe is screw-coupled to the thread portion83of the passage portion body81. Here, a tightening torque when the thread portion84of the passage portion body81is screw-coupled to the housing-side thread portion219is set to be larger than a tightening torque when the fuel supply pipe is screw-coupled to the thread portion83.

Next, a high-pressure pump according to a comparative embodiment will be described.

As shown inFIG.18, according to the comparative embodiment, a supply passage portion29is provided. The supply passage portion29includes a passage portion body291and an annular protrusion portion292. The passage portion body291is formed of a metal such as stainless steel in a cylindrical shape having a relatively small thickness. Here, the thickness of the passage portion body291is smaller than the thickness of the passage portion body81according to the present embodiment.

The annular protrusion portion292is formed to protrude in an annular shape from an outer peripheral wall of the passage portion body291at an end portion. The supply passage portion29is provided on the cover26by inserting the end portion of the passage portion body291into the cover hole portion265and welding the annular protrusion portion292to the outer peripheral wall of the cover cylinder portion261.

A fuel supply pipe (not shown) is connected to the supply passage portion29. The fuel supply pipe is, for example, a relatively soft pipe formed of a resin.

The comparative embodiment has a configuration same as that of a high-pressure pump disclosed in JP-A-2012-215164. In the comparative embodiment, when a stress is applied to a welded portion between the supply passage portion29and the cover26due to pipe pulsation, a pipe external force, vibration of the engine1, vibration of components during operation, and the like, the welded portion may be damaged. When the welded portion is damaged, the fuel in the fuel chamber260may leak to the outside.

An object of the present embodiment is to provide a high-pressure pump capable of preventing damage to a welded portion of a member and preventing leakage of fuel.

In the present embodiment, the supply passage portion80is screw-coupled to the upper housing21and the supply passage portion80and the cover26are welded to each other. Therefore, even when the pipe pulsation, the pipe external force, the vibration of the engine1, the vibration components during operation, and the like occur, a stress applied to the welded portion891and the welded portion892can be reduced. Accordingly, the fuel in the fuel chamber260can be prevented from leaking to the outside through the welded portion891and the welded portion892.

By providing the thread portion83in the supply passage portion80, the supply passage portion80can be connected to a fuel supply pipe formed of a steel pipe having a thread portion, and a risk of fuel leakage can be reduced.

The fuel that has flowed into the supply passage portion80from a fuel supply pipe side flows into the fuel chamber260, which is a wide space, through the supply hole82in an orifice shape. Therefore, the supply hole82serves as an aperture, and low-pressure pulsation on the fuel supply pipe side can be damped.

A tightening torque when the thread portion84of the passage portion body81is screw-coupled to the housing-side thread portion219is set to be larger than a tightening torque when the fuel supply pipe is screw-coupled to the thread portion83. Accordingly, the stress applied to the welded portion891and the welded portion892when the fuel supply pipe is screw-coupled to the thread portion83can be relaxed.

Fourteenth Embodiment

FIG.19shows a part of a high-pressure pump according to a fourteenth embodiment. The fourteenth embodiment is different from the thirteenth embodiment in the configuration of the supply passage portion or the like.

In the present embodiment, the supply passage portion80is not provided with the thread portion84. In addition, the upper housing21is not provided with the housing-side thread portion219. The supply passage portion80is provided in the upper housing21such that the passage portion body81is inserted into the cover hole portion265and the end portion of the passage portion body291is press-fitted into the housing hole portion218.

The present embodiment has a configuration same as that in the thirteenth embodiment except for the above points.

Other Embodiments

In the above embodiments, the example is shown in which the yoke641as the “first yoke” is provided on the pressure chamber200side with respect to the coil60in the axial direction of the coil60. On the other hand, in other embodiments, the yoke641may not be provided on the pressure chamber200side with respect to the coil60as long as a magnetic circuit can be formed on the pressure chamber200side with respect to the coil60in the axial direction of the coil60.

In the first to third and sixth embodiments, the example is shown in which the “second connection portion” is formed of an elastic member in an annular shape. On the other hand, in other embodiments, the “second connection portion” may be formed of a material having an elastic modulus larger than a predetermined value. In addition, the “second connection portion” is not limited to having an annular shape, and may be formed in a shape in which a part in a circumferential direction is interrupted.

In the above embodiments, the example is shown in which the intake valve portion and the electromagnetic drive portion form the normally open type valve device. On the other hand, in other embodiments, an intake valve portion and an electromagnetic drive portion may form a normally closed type valve device.

In other embodiments, the cover26may not be provided. In this case, for example, a supply passage portion may be provided in the upper housing21such that the inside of the supply passage portion and the intake passage216communicate with each other.

In other embodiments, at least two of the cylinder23, the upper housing21, and the lower housing22may be provided integrally. In addition, in other embodiments, at least two of the upper housing21, the seat member31, and the stopper35may be provided integrally.

In other embodiments, the above embodiments may be appropriately combined as long as there is no obstructive factor on the configuration. For example, the seventh embodiment and the twelfth embodiment are combined.

In the above embodiments, the example is shown in which the “third connection portion” and the “additional connection portion” are formed of an elastic member. On the other hand, in other embodiments, the “third connection portion” and the “additional connection portion” may be formed of a material having an elastic modulus larger than a predetermined value.

In other embodiments, a high-pressure pump may be applicable to an internal combustion engine other than a gasoline engine, such as a diesel engine. In addition, the high-pressure pump may be used as a fuel pump that discharges fuel toward a device other than an engine of a vehicle.

As described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in a variety of embodiments without departing from the scope of the present disclosure.

While the present disclosure has been described with reference to embodiments thereof, it is to be understood that the disclosure is not limited to the embodiments and constructions. To the contrary, the present disclosure is intended to cover various modification and equivalent arrangements. In addition, while the various elements are shown in various combinations and configurations, which are exemplary, other combinations and configurations, including more, less or only a single element, are also within the spirit and scope of the present disclosure.