Solenoid valve

A solenoid valve includes a valve portion and a solenoid portion. The valve portion has a sleeve and a valve body. The solenoid portion includes a tubular coil portion, a magnetic yoke having a side surface portion and a bottom portion, a columnar plunger, a shaft, a stator core having a core shaft hole for sliding the plunger in the axial direction, and a base portion having a base shaft hole. In a radial thickness of the sleeve, a thickness of a part corresponding to an end outer peripheral surface is smaller than a thickness of a sliding portion of an inner peripheral surface of the sleeve, which is a portion on which the valve body slides.

CROSS REFERENCE TO RELATED APPLICATION

The present application is based on Japanese Patent Application No. 2020-155322 filed on Sep. 16, 2020, disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a solenoid valve.

BACKGROUND

Conventionally, a solenoid valve includes a solenoid portion in which a plunger slides inside a stator core and a valve portion having a sleeve into which a valve body is inserted inside a coil that generates a magnetic force by energization.

SUMMARY

According to one embodiment of the present disclosure, a solenoid valve includes a valve portion and a solenoid portion.

The valve portion has a tubular sleeve extending along an axial direction and a valve body inserted into the sleeve and sliding in the axial direction.

The solenoid portion includes a tubular coil portion that generates magnetic force when energized, a magnetic yoke that have a side surface portion along the axial direction and a bottom portion formed along a direction intersecting the axial direction, and that accommodates the coil portion, a columnar plunger that slides in the axial direction, a shaft that is arranged between the plunger and the valve body in the axial direction and that moves the valve body in the axial direction according to the sliding of the plunger, a stator core that has a core shaft hole formed in the axial direction, accommodates at least a part of the shaft and the plunger in the core shaft hole, and slides the plunger in the axial direction by the magnetic force generated by the coil portion, and a base portion made of a cylindrical magnetic material and having a base shaft hole.

A sleeve end portion, which is an end portion of the sleeve on a solenoid portion side in the axial direction, is accommodated in the base shaft hole, and an end outer peripheral surface, which is an outer peripheral surface of the sleeve end portion, is fastened. A core end portion, which is an end portion of the stator core on a valve portion side in the axial direction, is accommodated in the base shaft hole and is in contact with the yoke.

In a radial thickness of the sleeve, a thickness of a part corresponding to the end outer peripheral surface is smaller than a thickness of a sliding portion of an inner peripheral surface of the sleeve, which is a portion on which the valve body slides.

The present disclosure can be realized as the following embodiments. For example, the present disclosure can be realized in the embodiment of a solenoid valve, a method of manufacturing a solenoid, and the like.

DETAILED DESCRIPTION

In an assumable example, a solenoid valve includes a solenoid portion in which a plunger slides inside a stator core and a valve portion having a sleeve into which a valve body is inserted inside a coil that generates a magnetic force by energization. In the solenoid valve, a flange portion formed on the sleeve and a yoke of the solenoid portion are fastened by caulking so that the solenoid portion and the valve portion are fixed.

However, a sleeve sliding portion may be deformed due to a radial stress generated when the sleeve is fastened to the solenoid portion. As a result, a gap between the sleeve and the valve body that is inserted into the sleeve and slides in an axial direction is reduced, and it may cause sliding failure of the valve body. Such a problem may occur not only when the flange portion formed on the sleeve and the yoke of the solenoid portion are fastened by caulking, but also when they are fastened by press fitting. That is, the sleeve sliding portion may be deformed at the time of press fitting, and the above-mentioned gap may be reduced. Further, the above problem may occur even when the sleeve and the flange portion are formed separately. Therefore, a technique capable of suppressing the deformation of the sleeve sliding portion and suppressing the sliding failure of the valve body is desired.

The present disclosure can be realized as the following embodiments.

According to one embodiment of the present disclosure, a solenoid valve includes a valve portion and a solenoid portion. The valve portion has a tubular sleeve extending along an axial direction and a valve body inserted into the sleeve and sliding in the axial direction.

The solenoid portion includes a tubular coil portion that generates magnetic force when energized, a magnetic yoke that have a side surface portion along the axial direction and a bottom portion formed along a direction intersecting the axial direction, and that accommodates the coil portion, a columnar plunger that slides in the axial direction, a shaft that is arranged between the plunger and the valve body in the axial direction and that moves the valve body in the axial direction according to the sliding of the plunger, a stator core that has a core shaft hole formed in the axial direction, accommodates at least a part of the shaft and the plunger in the core shaft hole, and slides the plunger in the axial direction by the magnetic force generated by the coil portion, and a base portion made of a cylindrical magnetic material and having a base shaft hole.

A sleeve end portion, which is an end portion of the sleeve on a solenoid portion side in the axial direction, is accommodated in the base shaft hole, and an end outer peripheral surface, which is an outer peripheral surface of the sleeve end portion, is fastened,

A core end portion, which is an end portion of the stator core on a valve portion side in the axial direction, is accommodated in the base shaft hole and is in contact with the yoke.

In a radial thickness of the sleeve, a thickness of a part corresponding to the end outer peripheral surface is smaller than a thickness of a sliding portion of an inner peripheral surface of the sleeve, which is a portion on which the valve body slides.

According to the solenoid valve of the embodiment described above, in the radial thickness of the sleeve, the thickness of the part corresponding to the end outer peripheral surface is smaller than the thickness of the sliding portion which is a portion of the inner peripheral surface of the sleeve on which the valve body slides. In the sleeve, the rigidity of the press-fitting portion to be fastened to the base portion can be made smaller than that of the sliding portion. Therefore, the deformation of the sleeve at the time of fastening is likely to occur at the press-fitting portion, and the deformation of the sleeve sliding portion can be suppressed. As a result, sliding defects of the valve body can be suppressed.

A. First Embodiment

A solenoid valve300of a first embodiment shown inFIG.1is a linear solenoid valve, which is used to control the hydraulic pressure of hydraulic oil supplied to an automatic transmission for vehicles (not shown), and is mounted on a valve body provided on an outer surface of a transmission case (not shown).FIG.1schematically shows a cross section of the solenoid valve300taken along a central axis AX.

The solenoid valve300includes a valve portion200and a solenoid portion100arranged side by side along the central axis AX.FIG.1shows the solenoid valve300in a non-energized state. The solenoid valve300of the present embodiment is a normally closed type, but may be a normally open type.

The valve portion200shown inFIG.1adjusts an opening area of a plurality of oil ports214described later. The valve portion200includes a sleeve210, a valve body220, a spring230, and a spring load adjusting member240.

The sleeve210has a substantially cylindrical external shape. The sleeve210extends along a direction parallel to the central axis AX (hereinafter, also referred to as “axial direction AD”). In the following, a direction from the solenoid portion100side to the valve portion200side toward the axial direction AD is referred to as “tip side direction”, and a direction from the valve portion200side toward the solenoid portion100side toward the axial direction AD is referred to as “base end side direction”. The sleeve210is formed with an insertion hole212penetrating along the central axis AX and a plurality of oil ports214communicating with the insertion hole212and opening in a radial direction. The valve body220is inserted into the insertion hole212. An end of the insertion hole212on the solenoid portion100side is formed to have an enlarged diameter and functions as an elastic member accommodating portion218. An elastic member420described later is accommodated in the elastic member accommodating portion218. The plurality of oil ports214are formed side by side along the axial direction AD. The plurality of oil ports214function as, for example, an input port, an output port, a feedback port, a drain port, and the like. The input port communicates with an oil pump (not shown) to receive a hydraulic pressure. The output port communicates with a clutch piston (not shown) to supply a hydraulic pressure. The feedback port applies a load to the valve body220based on the output hydraulic pressure. The drain port discharges the hydraulic oil. An end outer peripheral surface211of the end portion on the solenoid portion100side in the axial direction AD of the sleeve210is fastened to the inside of the base portion80described later. In the present embodiment, the radial direction means a direction orthogonal to the axial direction AD.

The valve body220has a plurality of large-diameter portions222and small-diameter portion224arranged side by side along the axial direction AD, and has a substantially rod-like external shape. The valve body220slides along the axial direction AD inside the insertion hole212, and adjusts the opening area of the plurality of oil ports214according to a position along the axial direction AD between the large-diameter portion222and the small-diameter portion224. A shaft90for transmitting the thrust of the solenoid portion100to the valve body220is in contact with one end of the valve body220. The spring230is arranged at the other end of the valve body220. The spring230is configured by a compression coil spring, and presses the valve body220in the axial direction AD to urge the valve body220toward the solenoid portion100. The spring load adjusting member240is arranged in contact with the spring230, and adjusts the spring load of the spring230by adjusting an amount of screwing into the sleeve210.

The solenoid portion100is controlled by an electronic control device (not shown), and functions as an actuator that drives the valve portion200by being energized. The solenoid portion100includes a yoke10, a coil20, a plunger30, a stator core40, a base portion80, and the elastic member420.

The yoke10is made of a magnetic metal, and forms an outer shell of the solenoid portion100as shown inFIG.1. The yoke10has a bottomed cylindrical external shape, and accommodates the coil20, the plunger30, and the stator core40. The yoke10has a side surface portion12, a bottom portion14, a thin wall portion17, and an opening portion18.

The side surface portion12has a substantially cylindrical external shape along the axial direction AD, and is disposed radially outside the coil20. The thin wall portion17is connected to an end of the side surface portion12on the valve portion200side and is a portion having a thickness smaller than that of the side surface portion12. The thin wall portion17constitutes the opening portion18of the yoke10. The thin wall portion17is in contact with the base portion80, which will be described in detail later, and is fixed to the base portion80.

The bottom portion14is an end of the side surface portion12, is connected to the end on the side opposite to the valve portion200side, is formed perpendicular to the axial direction AD, and closes the end of the side surface portion12. The bottom portion14faces a base end surface34of the plunger30described later.

The coil20has a tubular shape and is arranged inside the side surface portion12of the yoke10in the radial direction. The coil20generates a magnetic force when it is energized. The coil20generates a loop-shaped magnetic flux passing through the side surface portion12of the yoke10, the bottom portion14of the yoke10, the stator core40, the plunger30, and the base portion80(hereinafter, also referred to as “magnetic circuit C1”). For convenience of explanation, a part of the magnetic circuit C1formed when the coil20is energized is schematically shown by a thick arrow inFIG.1.

The coil20has a winding portion21and a bobbin22. The winding portion21is formed of a conducting wire having an insulating coating. The bobbin22is made of a resin. The bobbin22is connected to a connector26arranged on the outer periphery of the yoke10. A connection terminal24to which the end of the winding portion21is connected is arranged inside the connector26. The connector26electrically connects the solenoid portion100to the electronic control device via a connection line (not shown).

The plunger30has a substantially cylindrical external shape and is made of a magnetic metal. The plunger30is located inside a sliding core60in the radial direction. The plunger30slides in the axial direction AD on an inner peripheral surface of a core portion61of the stator core40described later. The above-described shaft90is disposed in contact with an end surface of the plunger30on the valve portion200side (hereinafter, also referred to as a “distal end surface32”). Thereby, the plunger30is urged toward the bottom portion14side of the yoke10along the axial direction AD by the urging force of the spring230transmitted to the valve body220shown inFIG.1. As shown inFIG.1, an end surface of the plunger30opposite to the distal end surface32(hereinafter, also referred to as a “base end surface34”) faces the bottom portion14of the yoke10. A breathing hole (not shown) penetrating the axial AD is formed inside the plunger30. The breathing hole allows fluids such as hydraulic oil and air, which are located on the base end surface34side and the distal end surface32side of the plunger30, to flow.

The Stator core40is made of a magnetic metal, and is disposed between the coil20and the plunger30. The stator core40is formed with a core shaft hole41in the axial direction AD. The core shaft hole41has a two-stage shaft hole having a small diameter and a large diameter arranged along the axial direction AD. The core shaft hole41accommodates a part of the shaft90in a small-diameter shaft hole, and accommodates the plunger30in a large-diameter shaft hole. The stator core40slides the plunger30in the axial direction AD by the magnetic force generated by the coil20. The stator core40is configured by a member in which a magnetic attraction core50, a sliding core60, and a magnetic flux passage suppressing portion70are integrated.

The magnetic attraction core50is disposed so as to surround the shaft90in a circumferential direction. The magnetic attraction core50constitutes a portion of the stator core40on the valve portion200side, and magnetically attracts the plunger30by the magnetic force generated by the coil20. A stopper55is disposed on a surface of the magnetic attraction core50facing the distal end surface32of the plunger30. A radial length of the stopper55is smaller than the radial length of the plunger30. The stopper55is made of a non-magnetic material, and suppresses a direct contact between the plunger30and the magnetic attraction core50, and also prevents the plunger30from being separated from the magnetic attraction core50due to the magnetic attraction.

The sliding core60constitutes a portion of the stator core40on the bottom portion14side, and is disposed radially outside the plunger30. The sliding core60has a core portion61and a magnetic flux transfer portion65.

The core portion61has a substantially cylindrical external shape, and is disposed between the coil20and the plunger30in the radial direction orthogonal to the axial direction AD. The core portion61guides the movement of the plunger30along the axial direction AD. As a result, the plunger30slides directly on an inner peripheral surface of the core portion61. An end portion of the sliding core60that is located on an opposite side to the magnetic attraction core50side (hereinafter, also referred to as a “first core end portion62”) is in contact with the bottom portion14.

The magnetic flux transfer portion65is formed radially outward from the first core end portion62over the entire circumference of the first core end portion62. Therefore, the magnetic flux transfer portion65is arranged between the bobbin22and the bottom portion14of the yoke10in the axial direction AD. The magnetic flux transfer portion65transfers magnetic flux between the yoke10and the plunger30via the core portion61. The magnetic flux transfer portion65of the present embodiment transfers magnetic flux between the bottom portion14of the yoke10and the plunger30. The magnetic flux transfer portion65may transfer magnetic flux between the side surface portion12of the yoke10and the plunger30. The magnetic flux transfer portion65of the present embodiment is formed integrally with the core portion61.

A magnetic flux passage suppressing portion70is formed between the magnetic attraction core50and the core portion61in the axial direction AD. The magnetic flux passage suppressing portion70suppresses the direct passage of magnetic flux between the core portion61and the magnetic attraction core50. The magnetic flux passage suppressing portion70of the present embodiment is configured such that a radial thickness of the stator core40is formed to be thin, so that the magnetic resistance of the magnetic flux passage suppressing portion70is higher than that of the magnetic attraction core50and the core portion61.

A base portion80is a substantially tubular magnetic material member, and a base shaft hole84is formed in the axial direction AD. The base shaft hole84has a two-stage shaft hole having a small diameter and a large diameter arranged along the axial direction AD. The small-diameter shaft hole of the base shaft hole84accommodates a part of the end portion on the valve portion200side (hereinafter, referred to as “second core end portion53”) of the stator core40in the axial direction AD, and a part of the shaft90. The large-diameter shaft hole of the base shaft hole84accommodates an end portion (hereinafter referred to as “sleeve end portion”) on the solenoid portion100side of the sleeve210in the axial direction AD, and the elastic member420, and a part of the shaft90.

The base portion80is fastened to the end outer peripheral surface211, which is an outer peripheral surface of the sleeve end. The outer peripheral surface of the sleeve210means a first outer peripheral surface. The base portion80is arranged on the outer side in the radial direction of the outer peripheral surface (hereinafter, referred to as “second outer peripheral surface52”) of the magnetic attraction core50, and abuts on the yoke10inside the yoke10. In the present embodiment, the base portion80includes a first inner diameter portion81, a second inner diameter portion82having an inner diameter smaller than that of the first inner diameter portion81, and a connection surface83that connects the first inner diameter portion81and the second inner diameter portion82and is substantially parallel to the radial direction. In the present embodiment, the connection surface83is in contact with the end surface of the sleeve210on the solenoid portion100side in the axial direction AD. In the present embodiment, the base portion80is press-fitted into the end outer peripheral surface211at the first inner diameter portion81and fastened. Further, the base portion80is fitted to the second outer peripheral surface52at the second inner diameter portion82. Further, in the present embodiment, the base portion80is in contact with the side surface portion12of the yoke10in the axial direction AD on the outer side in the radial direction and on the solenoid portion100side in the axial direction AD. The base portion80transfers a magnetic flux between the magnetic attraction core50of the stator core40and the side surface portion12of the yoke10.

The elastic member420is accommodated in an elastic member accommodating portion218formed in the sleeve210of the valve portion200and urges the stator core40toward the bottom portion14. The elastic member420is arranged in contact with the end surface of the magnetic attraction core50in the axial direction AD and on the side opposite to the plunger30side. In the present embodiment, the elastic member420is configured by a compression coil spring having a substantially cylindrical external shape. The end portion of the valve body220is inserted inside the elastic member420in the radial direction. Since the stator core40is urged in the axial direction AD toward the bottom portion14of the yoke10by the elastic member420, the first magnetic flux transfer portion65is pressed against the bottom portion14, and the magnetic flux transfer portion65is pressed to the bottom portion14. Therefore, the loss of the magnetic flux transmitted from the bottom portion14of the yoke10to the magnetic flux transfer portion65is suppressed.

In the present embodiment, the yoke10, the plunger30, and the stator core40are each made of iron. They are not limited to iron, they may be composed of any magnetic material such as nickel and cobalt. In the present embodiment, plating is applied on the outer peripheral surface of the plunger30. By such a plating treatment, the rigidity of the plunger30can be increased, and deterioration of slidability can be suppressed. Further, in the present embodiment, the yoke10is formed by press molding and the stator core40is formed by forging, but each may be formed by any molding method. For example, the yoke10may be integrated by caulking fixing, press-fitting fixing, or the like after the side surface portion12and the bottom portion14are formed separately from each other.

When power is supplied to the winding portion21, the magnetic circuit C1is formed inside the solenoid portion100. The plunger30is drawn toward the magnetic attraction core50by the formation of the magnetic circuit C1and slides on the inner peripheral surface of the core portion61in the axial direction AD. As the current flowing through the coil20increases, the magnetic flux density of the magnetic circuit C1increases, and the stroke amount of the plunger30increases.

The shaft90that abuts on the distal end surface32of the plunger30is arranged between the plunger30and the valve body220in the axial direction AD. When the plunger30strokes toward the magnetic attraction core50side, the valve body220shown inFIG.1is pressed toward the spring230side. As a result, the opening area of the oil port214is adjusted, and a hydraulic pressure proportional to the value of the current flowing through the winding portion21is output.

As shown inFIG.2, in the radial thickness of the sleeve210, a thickness Th1of the part corresponding to the end outer peripheral surface211is smaller than the thickness Th2of the sliding portion SL1which is a portion of the inner peripheral surface of the sleeve on which the valve body220slides. As a result, when the sleeve210is fastened to the base portion80, the rigidity of the press-fitting portion to be fastened to the base portion80can be made smaller than that of the sliding portion SL1, and the deformation of the sleeve210at the time of fastening is likely to occur at the press-fitting portion, and the occurrence at the sliding portion SL1can be suppressed. Therefore, a gap between the sleeve210and the valve body220that is inserted into the sleeve210and slides in the axial direction is reduced, and the sliding failure of the valve body220is suppressed. InFIG.2, the configuration on the base end side direction of the solenoid portion100and the configuration on the tip side direction of the valve portion200are omitted, and a part of the solenoid portion100and a part of the valve portion200are shown.

The coil20of the present embodiment corresponds to the coil portion in the claims. The second core end portion53corresponds to the core end portion in the scope of the claims.

According to the solenoid valve300of the first embodiment described above, in the radial thickness of the sleeve210, the thickness Th1of the part corresponding to the end outer peripheral surface211is smaller than the thickness Th2of the sliding portion SL1which is a portion of the inner peripheral surface of the sleeve210on which the valve body220slides. In the sleeve, the rigidity of the press-fitting portion to be fastened to the base portion can be made smaller than that of the sliding portion. Therefore, the deformation of the sleeve at the time of fastening is likely to occur at the press-fitting portion, and the deformation of the sleeve sliding portion can be suppressed. As a result, sliding defects of the valve body can be suppressed.

B. Second Embodiment

As shown inFIG.3, in a solenoid valve300aof a second embodiment, a groove Ea having the radial direction as the depth direction is formed over the entire circumference in a portion continuous in the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion of the inner surface of the sleeve210, and on end portion on the sliding portion side in the axial direction AD. It differs from the solenoid valve300of the first embodiment in this respect. Since the configuration of the solenoid valve300aof the second embodiment other than this configuration is the same as the configuration of the solenoid valve300of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

As shown inFIG.3, of the inner peripheral surface216of the sleeve210, the groove Ea having a radial direction as a depth direction is formed over the entire circumference on the end portion toward the tip end side of the inner peripheral surface extending in parallel with the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion side.

The solenoid valve300aof the second embodiment described above has the same effect as the solenoid valve300of the first embodiment. In addition, in the solenoid valve300aof the second embodiment, a groove Ea having the radial direction as the depth direction is formed over the entire circumference in a portion continuous in the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion of the inner surface of the sleeve210, and on end portion on the sliding portion side in the axial direction AD. Therefore, in the sleeve210, the rigidity of the press-fitting portion side to be fastened to the base portion80can be made smaller than the rigidity of the sliding portion, and the sleeve210can be more easily deformed to the press-fitting portion side at the time of fastening.

As shown inFIG.4, in a solenoid valve300bof a third embodiment, a groove Eb having the axial direction AD as the depth direction is formed over the entire circumference in a portion continuous in the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion of the inner surface of the sleeve210, and on end portion on the sliding portion side in the axial direction AD. It differs from the solenoid valve300of the first embodiment in this respect. Since the configuration of the solenoid valve300bof the third embodiment other than this configuration is the same as the configuration of the solenoid valve300of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

As shown inFIG.4, of the inner peripheral surface216of the sleeve210, the groove Eb having the axial direction AD as a depth direction is formed over the entire circumference on the end portion toward the tip end side of the inner peripheral surface extending in parallel with the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion side.

The solenoid valve300bof the third embodiment described above has the same effect as the solenoid valve300of the first embodiment. In addition, in a solenoid valve300bof the third embodiment, a groove Eb having the axial direction AD as the depth direction is formed over the entire circumference in a portion continuous in the axial direction AD from the part corresponding to the end outer peripheral surface211to the sliding portion of the inner surface of the sleeve210, and on end portion on the sliding portion side in the axial direction AD. Therefore, in the sleeve210, the rigidity of the press-fitting portion side to be fastened to the base portion80can be made smaller than the rigidity of the sliding portion, and the sleeve210can be more easily deformed to the press-fitting portion side at the time of fastening.

As shown inFIG.5, in the solenoid valve300cof a fourth embodiment, a groove Ec recessed in the radial direction is formed on a first outer peripheral surface of the sleeve210over the entire circumference. It is different from the solenoid valve300of the first embodiment. Since the configuration of the solenoid valve300cof the fourth embodiment other than this configuration is the same as the configuration of the solenoid valve300of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

As shown inFIG.5, a groove Ec is formed over the entire circumference in the radial direction at a position between the end portion of the end outer peripheral surface211on the sliding portion side and the part of the first outer peripheral surface of the sleeve210corresponding to the sliding portion on the solenoid portion100side in the base end side direction in the first outer surface of the sleeve210.

The solenoid valve300cof the fourth embodiment described above has the same effect as the solenoid valve300of the first embodiment. In addition, in the solenoid valve300cof the fourth embodiment, the groove Ec is formed over the entire circumference in the radial direction at a position between the end portion of the end outer peripheral surface211on the sliding portion side and the part of the first outer peripheral surface of the sleeve210corresponding to the sliding portion on the solenoid portion100side in the base end side direction in the first outer surface of the sleeve210. Therefore, in the sleeve210, the rigidity of the press-fitting portion side to be fastened to the base portion80can be made smaller than the rigidity of the sliding portion, and the sleeve210can be more easily deformed to the press-fitting portion side at the time of fastening.

As shown inFIG.6, the solenoid valve300dof the fifth embodiment includes a base portion80dhaving a first tubular portion86and a flange portion87, and this point is different from the solenoid valve300of the first embodiment. Since the configuration of the solenoid valve300dof the fifth embodiment other than this configuration is the same as the configuration of the solenoid valve300of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

As shown inFIG.6, the base portion80dis a substantially tubular magnetic material member, and has the first tubular portion86and the flange portion87protruding in the axial direction AD with respect to the first tubular portion86. The end portion of the sleeve is press-fitted to the first tubular portion86, and the end outer peripheral surface211is fastened to the first tubular portion86. The flange portion87is protruded in the axial direction AD with respect to the first tubular portion86, and has an outer diameter larger than the outer diameter of the first tubular portion86. The flange portion87is arranged on the outer side in the radial direction of the second outer peripheral surface52of the magnetic attraction core50, and abuts on the yoke10inside the yoke10. In the present embodiment, the inner diameter of the first tubular portion86is larger than the inner diameter of the flange portion87. An outer peripheral surface88of the flange portion87is caulked and fixed to the thin wall portion17of the yoke10.

The solenoid valve300dof the fifth embodiment described above has the same effect as the solenoid valve300of the first embodiment. In addition, in the solenoid valve300dof the fifth embodiment, the base portion80further has the first tubular portion86having a smaller radial thickness and the flange portion87having a larger radial thickness than the first tubular portion. Therefore, the rigidity of the base portion80side becomes small. As a result, deformation of the sleeve210at the time of fastening is likely to occur on the outer diameter side of the press-fitting portion of the base portion80rather than the inner diameter side of the sleeve210.

F. Other Embodiments

(F1) In the solenoid valve300of the first embodiment, the outer diameter of the sleeve210at the fastening portion with the base portion80and the outer diameter of the sleeve210corresponding to the sliding portion of the valve body220are substantially the same. However, this disclosure is not limited to this configuration. As shown in the solenoid valve300eofFIG.7, the outer diameter of the sleeve210at the fastening portion with the base portion80may be smaller than the outer diameter of the sleeve210at the part corresponding to the sliding portion of the valve body220. Also in this configuration, as shown inFIG.7, in the radial thickness of the sleeve210, the thickness of the part corresponding to the end outer peripheral surface211is smaller than the thickness of the sliding portion, which is the portion of the inner peripheral surface of the sleeve210on which the valve body220slides. Therefore, the same effect as that of the solenoid valve300of the first embodiment can be obtained. InFIG.7, the configuration on the tip side direction of the valve portion200are omitted, and the solenoid portion100and a part of the valve portion200are shown.

(F2) In the solenoid valve300of the first embodiment, the inner diameter of the sleeve210at the fastening portion with the base portion80was larger than the inner diameter of the sleeve210at the part corresponding to the sliding portion of the valve body220. The present disclosure is not limited to this configuration. As shown in the solenoid valve300fofFIG.8, the inner diameter of the sleeve210at the fastening portion with the base portion80may be the same as the inner diameter of the sleeve210at the part corresponding to the sliding portion of the valve body220. Also in this configuration, as shown inFIG.8, in the radial thickness of the sleeve210, the thickness of the part corresponding to the end outer peripheral surface211is smaller than the thickness of the sliding portion, which is the portion of the inner peripheral surface of the sleeve210on which the valve body220slides. Therefore, the same effect as that of the solenoid valve300of the first embodiment can be obtained. InFIG.8, the configuration on the tip side direction of the valve portion200are omitted, and the solenoid portion100and a part of the valve portion200are shown.

(F3) In the solenoid valve300aof the second embodiment and the solenoid valve300bof the third embodiment, the grooves Ea and Eb are formed over the entire circumference, but instead, they may be formed only on a part of the entire circumference.

(F4) In the solenoid valve300cof the fourth embodiment, the groove Ec is formed over the entire circumference, but instead, it may be formed only on a part of the entire circumference. Further, the groove Ec in the radial direction may be located at any position between the end portion of the end outer peripheral surface211on the sliding portion side and the end portion of the outer peripheral surface of the sleeve210on the end outer peripheral surface211in the base end side direction, which corresponds to the sliding portion on the solenoid portion100side.

(F5) In the solenoid valve300dof the fifth embodiment, the flange portion87accommodates a part of the end portion of the magnetic attraction core50on the valve portion200side, but the present disclosure is not limited to this configuration. The flange portion87may entirely accommodate the end portion on the valve portion200side of the magnetic attraction core50.

(F6) In the solenoid valve300of the first embodiment, the bottom portion14of the yoke10is formed perpendicular to the axial direction AD, but the present disclosure is not limited to this configuration. The bottom portion14of the yoke10may be formed along any direction intersecting the axial direction AD.

The present disclosure should not be limited to the embodiments described above, and various other embodiments may be implemented without departing from the scope of the present disclosure. For example, the technical features in each embodiment corresponding to the technical features in the form described in the summary may be used to solve some or all of the above-described problems, or to provide one of the above-described effects. In order to achieve a part or all, replacement or combination can be appropriately performed. Also, if the technical features are not described as essential in the present specification, they can be deleted as appropriate.