Patent Description:
The present disclosure relates to a field of vehicles, for example, an electric oil pump.

The vehicle industry is developing rapidly towards vehicle performances being safer, more reliable, more stable, fully automatic intelligentizatied, environmental protective and energy saving, an electric oil pump is widely used in at least one of a lubrication system and a cooling system of a vehicle, and can well meeting requirements of a market.

The electric oil pump mainly serves as a power source for at least one of the lubrication system and the cooling system of the vehicle, for example, at least one of a lubrication system and a cooling system of a car. Generally, the electric oil pump includes an electric control board assembly, and how to prevent a working medium from affecting performance of the electric control board assembly is a technical problem that needs to be considered in a design process of the electric oil pump.

<CIT> relates to an electric pump, which includes: a motor section (<NUM>) includes a rotating shaft (<NUM>); and a pump section (<NUM>) includes: a pump body (<NUM>) in which are arranged: a recess section (<NUM>) into which a portion of the motor section (<NUM>) fits; and an accommodating portion (<NUM>) formed by hollowing out a bottom portion of the recessed portion (<NUM>); a gear pump operates portion (<NUM>) housed in the accommodating portion (<NUM>) and coupled to the rotating shaft (<NUM>) inserted into the accommodating portion (<NUM>) from a side near the recessed portion (<NUM>); and a cover (<NUM>) that seals an opening portion of the accommodating portion (<NUM>) from the side near the recessed portion (<NUM>); the pump section (<NUM>) is operated by rotation of the rotating shaft (<NUM>).

<CIT> relates to a pump (<NUM>), has a pump head (<NUM>), which has a pump chamber (<NUM>), and has an electric motor (<NUM>), which drives the pump head (<NUM>) and has a stator (<NUM>) and a rotor (<NUM>), the rotor (<NUM>) is connected to the pump head (<NUM>) and is disposed in a rotor chamber (<NUM>) open toward the pump chamber (<NUM>). The stator (<NUM>) is disposed radially around the rotor chamber (<NUM>), and the rotor chamber (<NUM>) is sealed off from the pump chamber (<NUM>) by a sealing wall (<NUM>) belongs to the stator (<NUM>) and by at least one wall (<NUM>) of the pump housing (<NUM>).

The present disclosure provides an electric oil pump, capable of preventing a working medium from affecting performance of an electric control board.

An electric oil pump includes a pump housing provided with an inner pump cavity, where the inner pump cavity includes a first cavity and a second cavity that are in communication with each other; a first rotor assembly disposed in the first cavity; a stator assembly and a second rotor assembly that are disposed in the second cavity; a pump shaft, where the first rotor assembly is disposed adjacent to a first end of the pump shaft, and the second rotor assembly is disposed adjacent to a second end of the pump shaft; an electric control board assembly; an isolating member, where the stator assembly is disposed at a first side of the isolating member, the electric control board assembly is disposed at a second side of the isolating member, and the isolating member is connected to the pump housing; and a wiring terminal fixedly connected to the isolating member; where a connecting position between the wiring terminal and the isolating member is sealed and a connecting position between the isolating member and the pump housing is sealed, so that the second cavity is unable to communicate with one side of the isolating member where the electric control board assembly is located via the connecting position between the wiring terminal and the isolating member, and via the connecting position between the isolating member and the pump housing.

Since the first cavity and the second cavity of the electric oil pump are in communication with each other, part of the working medium in the first cavity may enter the second cavity and contact with at least part of the stator assembly, and such arrangement is beneficial to heat dissipation of the stator assembly. The electric oil pump includes the isolating member. The stator assembly is disposed on the first side of the isolating member, the electric control board is disposed on the second side of the isolating member, and the isolating member is fixedly connected to the wiring terminal. The connecting position between the wiring terminal and the isolating member is sealed, the connecting position between the isolating member and the pump housing is sealed, the second cavity is not in communication with the one side of the isolating member where the electric control board assembly is located, and the working medium in the second cavity cannot enter the one side of the isolating member where the electric control board is located through the connecting position between the wiring terminal and the isolating member or the connecting position between the isolating member and the pump housing. Such arrangements are beneficial to prevent the working medium from affecting the performance of the electric control board, thereby avoiding affecting performance of the electric oil pump.

An electric oil pump in the present embodiment is able to provide flowing power for a working medium of at least one of a lubrication system and a cooling system of a vehicle.

The electric oil pump in the present embodiment can mainly provide the flowing power for the working medium of the lubrication system and/or the cooling system of the vehicle, specifically, a lubrication system and/or a cooling system of a vehicle transmission system.

Referring to <FIG>, the electric oil pump <NUM> includes a pump housing, a first rotor assembly <NUM>, a stator assembly <NUM>, a second rotor assembly <NUM> and an electric control board assembly <NUM>. The pump housing is provided with an inner pump cavity, and the first rotor assembly <NUM>, the stator assembly <NUM>, the second rotor assembly <NUM> and the electric control board assembly <NUM> are disposed in the pump inner cavity. In the present embodiment, the inner pump cavity includes a first cavity <NUM> and a second cavity <NUM>, where the first rotor assembly <NUM> is disposed in the first cavity <NUM>, and the stator assembly <NUM> and the second rotor assembly <NUM> are disposed in the second cavity <NUM>. The stator assembly <NUM> is sleeved onto an outer periphery of the second rotor assembly <NUM>, the first rotor assembly <NUM> is disposed adjacent to a first end of a pump shaft <NUM>, and the second rotor assembly <NUM> is disposed adjacent to a second end of the pump shaft <NUM>. The first rotor assembly <NUM>, the second rotor assembly <NUM>, the isolating member <NUM>, and the electric control board assembly <NUM> are distributed along an axial direction of the electric oil pump, and the second rotor assembly <NUM> is disposed between the first rotor assembly <NUM> and the electric control board assembly <NUM>. Referring to <FIG>, the stator assembly <NUM> includes a stator iron core <NUM> and a coil <NUM>. When the electric oil pump <NUM> is in operation, the electric control board assembly <NUM> controls current passing through the coil <NUM> of the stator assembly <NUM> to vary according to a predetermined rule, so as to control the stator assembly <NUM> to generate a variable excitation magnetic field; the second rotor assembly <NUM> rotates under action of the excitation magnetic field, and may directly or indirectly drive part of components of the first rotor assembly <NUM> to rotate. When the first rotor assembly <NUM> rotates, a volume of a hydraulic cavity in the first rotor assembly <NUM> varies, so that the working medium is pressed out to a fluid outlet to generate flowing power.

Referring to <FIG>, in the present embodiment, the pump housing includes a first housing <NUM>, a second housing <NUM> and a third housing <NUM>, where the first housing <NUM> is relatively fixedly connected to the second housing <NUM> and the third housing <NUM>, respectively. In the present embodiment, the third housing <NUM> and the second housing <NUM> are connected by a screw or a bolt. Such arrangement enables it easier to disassemble and assemble the electric oil pump, thereby facilitating maintenance of the first rotor assembly <NUM> of the electric oil pump. In an embodiment, the third housing <NUM> and the second housing <NUM> may also be connected in other manners, such as in a plug-in manner, in a clamping manner, etc., and the second housing <NUM> is fixedly connected to the first housing <NUM>. In an embodiment, the second housing <NUM> and the first housing <NUM> are connected by a screw or a bolt. Such arrangement enables it easier to disassemble and assemble the electric oil pump and enables connection between the second housing <NUM> and the first housing <NUM> more reliable. In the present embodiment, the electric control board assembly <NUM> is disposed in an empty cavity between the second housing <NUM> and the first housing <NUM>. Such arrangement also facilitates maintenance of the electric control board assembly <NUM> in the electric oil pump. In an embodiment, the second housing <NUM> and the first housing <NUM> may also be connected in other manners, such as in a plug-in manner, in a clamping manner.

Referring to <FIG>, the first rotor assembly <NUM> includes a first rotor <NUM> and a second rotor <NUM>, where the first rotor <NUM> includes a plurality of internal teeth, and the second rotor <NUM> includes a plurality of external teeth. A hydraulic cavity <NUM> is formed between the internal teeth of the first rotor <NUM> and the external teeth of the second rotor <NUM>. In the present embodiment, the hydraulic cavity <NUM> is also part of the first cavity <NUM>. In the present embodiment, the first rotor <NUM> is sleeved onto an outer periphery of the second rotor <NUM>. Referring to <FIG>, the electric oil pump further includes a fluid inlet <NUM> and a fluid outlet <NUM>, the working medium may enter the hydraulic cavity <NUM> through the fluid inlet <NUM>, and may exit the hydraulic cavity <NUM> through the fluid outlet <NUM>. Because a certain eccentricity exists between the first rotor <NUM> and the second rotor <NUM>, when the second rotor <NUM> rotates, part of the external teeth of the second rotor <NUM> are meshed with part of the internal teeth of the first rotor <NUM>, thereby driving the first rotor <NUM> to rotate. During rotating the first rotor <NUM> and the second rotor <NUM> for one revolution, the volume of the hydraulic cavity <NUM> changes. When the first rotor assembly <NUM> rotates from a starting position to a certain angle, the volume of the hydraulic cavity <NUM> gradually increases to form a local vacuum, and the working medium is sucked into the hydraulic cavity <NUM> from the fluid inlet <NUM>. When the first rotor <NUM> and the second rotor <NUM> continue to rotate, the volume of the hydraulic cavity <NUM> filled with the working medium decreases gradually, and the working medium is squeezed, so that the working medium entering the hydraulic cavity <NUM> is pressed out to the fluid outlet <NUM> to generate the flowing power. In the present embodiment, the electric oil pump <NUM> further includes the pump shaft <NUM>, and the pump shaft <NUM> may drive part of the first rotor assembly <NUM> to rotate. In the present embodiment, the pump shaft <NUM> may drive the second rotor <NUM> to rotate, and is connected to the second rotor <NUM>. The second rotor is arranged adjacent to the first end of the pump shaft <NUM>. The pump shaft <NUM> is connected to the second rotor assembly <NUM>, and the second rotor assembly <NUM> is arranged adjacent to the second end of the pump shaft <NUM>. The second rotor assembly <NUM> drives the second rotor <NUM> to rotate via the pump shaft <NUM>, so as to rotate the first rotor assembly <NUM>, that is, the second rotor <NUM> and the first rotor <NUM> realize transmission through meshing between the internal teeth of the first rotor <NUM> and external teeth of the second rotor <NUM>.

Referring to <FIG>, the first cavity <NUM> may have the working medium flowing through, and the first cavity <NUM> is communicated to the second cavity <NUM>. Part of the working medium in the first cavity <NUM> may enter the second cavity <NUM> and contact with at least part of the stator assembly <NUM> located in the second cavity <NUM>, so that the working medium in the second cavity may exchange or transfer heat with the stator assembly, thereby facilitating heat dissipation of the stator assembly <NUM>. In an embodiment, the electric oil pump <NUM> includes a first flow channel <NUM> and a second flow channel <NUM>. Part of the working medium in the first cavity <NUM> may enter the second cavity <NUM> through the first flow channel <NUM> and contact the stator assembly <NUM> located in the second cavity <NUM>, and then the working medium in the second cavity <NUM> may flow out through the second flow channel <NUM>, so that the working medium located in the second cavity <NUM> has fluidity and the flowing working medium is more conducive to heat dissipation of the stator assembly. Referring to <FIG>, the electric oil pump <NUM> further includes the isolating member <NUM>. The stator assembly <NUM> is disposed on a first side of the isolating member <NUM>, and the electric control board assembly <NUM> is disposed on a second side of the isolating member <NUM>. The isolating member <NUM> is fixedly connected to the wiring terminal <NUM>, and a connecting position between the wiring terminal <NUM> and the isolating member <NUM> is sealed. A sealing structure is provided between the isolating member <NUM> and the pump housing, so that a connecting position between the isolating member <NUM> and the pump housing is sealed. Therefore, the second cavity <NUM> is unable to communicate with one side of the isolating member <NUM> where the electric control board assembly <NUM> is located via the connecting position between the wiring terminal <NUM> and the isolating member <NUM>, and via the connecting position between the isolating member <NUM> and the pump housing. Such arrangements are beneficial to prevent the working medium from entering the one side of the isolating member <NUM> where the electric control board assembly <NUM> is located, thereby helping to prevent the working medium from adversely affecting performance of the electric control board assembly <NUM>, and thereby avoiding affecting performance of the electric oil pump.

Referring to <FIG>, the isolating member <NUM> is provided with a slot <NUM> disposed on an outer peripheral side wall of the isolating member <NUM>. Combined with <FIG>, the electric oil pump <NUM> includes a seal ring <NUM> disposed in the slot <NUM> of the isolating member <NUM>, and the isolating member <NUM> and the seal ring <NUM> may prevent the working medium from entering the one side of the isolating member <NUM> where the electric control board assembly <NUM> is located along the outer peripheral side wall of the isolating member <NUM>.

Referring to <FIG>, the isolating member <NUM> includes a groove <NUM> recessed from an upper surface <NUM> of the isolating member <NUM>. The groove <NUM> does not penetrate through the isolating member <NUM> and the wiring terminal <NUM> passes through the groove <NUM>. A gap is provided between an outer periphery of the wiring terminal <NUM> disposed in the groove <NUM> and an inner wall of the groove <NUM>, and the gap is filled with a sealant (not shown in the figure). Combined with <FIG>, in the present embodiment, when the electric oil pump <NUM> is in operation, the working medium flows into the second cavity <NUM>, such arrangement is conducive to heat dissipation of the stator assembly <NUM>. In order to prevent the working medium from seeping into the one side of the isolating member <NUM> where the electric control board assembly <NUM> is located from the connecting position between the wiring terminal <NUM> and the isolating member <NUM>, the groove <NUM> is filled with the sealant, which is beneficial to prevent the working medium from seeping into the one side of the isolating member <NUM> where the electric control board assembly <NUM> is located from the connecting position between the wiring terminal <NUM> and the isolating member <NUM>. In the present embodiment, the isolating member <NUM> and the wiring terminal <NUM> are integrally formed by injection molding to achieve fixed connection of the isolating member <NUM> and the wiring terminal <NUM>, and then the groove <NUM> is filled with the sealant to get sealed. Therefore, defects such as blowholes generated in an injection molding process of the components are prevented, thereby preventing the working medium from seeping into the one side of the isolating member <NUM> where the electric control board assembly <NUM> is located in <FIG> through the blowholes. In an embodiment, on the premise that the injection molding does not cause defects such as blowholes, the wiring terminal <NUM> may also be directly fixed with the isolating member <NUM> by injection molding to achieve sealing between the wiring terminal <NUM> and the isolating member <NUM>. At this moment, it is not necessary to provide the groove <NUM> and fill the groove <NUM> with the sealant to get sealed. Referring to <FIG> and <FIG>, in the present embodiment, the isolating member <NUM> is located in a cavity of the second housing <NUM>, and at least part of the outer peripheral side wall of the isolating member <NUM> is tightly fitted with an inner peripheral side wall of the second housing <NUM>, thereby achieving fixation of the isolating member <NUM>.

Referring to <FIG>, the electric oil pump <NUM> includes the fluid inlet <NUM> and the fluid outlet <NUM>. The fluid inlet <NUM> is configured for the working medium to flow in, and the fluid outlet <NUM> is configured for the working medium to flow out. In the present embodiment, the fluid inlet <NUM> includes a first fluid inlet <NUM>, a second fluid inlet <NUM>, and a third fluid inlet <NUM>. The first fluid inlet <NUM> and the second fluid inlet <NUM> are in communication with each other, and the first fluid inlet <NUM> and the third fluid inlet <NUM> are in communication with each other. The fluid outlet <NUM> includes a first fluid outlet <NUM> and a second fluid outlet <NUM> that are in communication with each other. The fluid inlet <NUM> and the fluid outlet <NUM> of the electric oil pump in the present embodiment are described in detail below.

Referring to <FIG>, the third housing <NUM> includes the fluid inlet <NUM>, and the fluid inlet <NUM> includes the first fluid inlet <NUM>, the second fluid inlet <NUM>, and the third fluid inlet <NUM>. The first fluid inlet <NUM> and the second fluid inlet <NUM> are in communication with each other, and the first fluid inlet <NUM> and the third fluid inlet <NUM> are in communication with each other. The working medium flows into the electric oil pump through the first fluid inlet <NUM>, part of the working medium that flows into the electric oil pump enters the first flow channel <NUM> in <FIG> through the second fluid inlet <NUM>, and another part of the working medium enters the hydraulic cavity <NUM> in <FIG> through the third fluid inlet <NUM>. Such arrangements are conducive to distribution of the working medium. In an embodiment, the part of the working medium enters the first flow channel <NUM> in <FIG> through the second fluid inlet <NUM>, and then enters the second cavity <NUM> in <FIG> and contacts with the stator assembly located in the second cavity <NUM>. The other part of the working medium enters the hydraulic cavity <NUM> in <FIG> through the third fluid inlet <NUM>, so that the other part of the working medium that enters the hydraulic cavity <NUM> generates the flowing power through volume change of the hydraulic cavity. Referring to <FIG>, the third housing <NUM> includes an end surface <NUM>. Combined with <FIG>, the end surface <NUM> is disposed in contact with the second housing <NUM>. The third housing <NUM> includes a first fluid outlet <NUM> recessed from the end surface <NUM> of the third housing <NUM> toward a direction away from the end surface <NUM> of the third housing <NUM>. In condition that the first fluid outlet <NUM> is orthographically projected to the end surface of the third housing <NUM>, at least part of an outer edge of the first fluid outlet <NUM> coincides with an outer edge of the end surface <NUM> of the third housing <NUM>, and such arrangement facilitates outflow of the working medium. Referring to <FIG>, the second housing <NUM> is provided with the second fluid outlet <NUM> recessed from an upper surface <NUM> of the second housing <NUM> toward a direction away from the upper surface <NUM> of the second housing <NUM>. In condition that the second fluid outlet <NUM> is orthographically projected to the upper surface <NUM> of the second housing <NUM>, at least part of an outer edge of the second fluid outlet <NUM> coincides with an edge of an outer peripheral side wall of the second housing <NUM>, and such arrangement facilitates the outflow of the working medium. Referring to <FIG>, when the third housing <NUM> and the second housing <NUM> are assembled together, a position of the first fluid outlet <NUM> and a position of the second fluid outlet <NUM> are oppositely disposed, so that the first fluid outlet <NUM> is in communication with the second fluid outlet <NUM>, thereby facilitating the outflow of the working medium. In the present embodiment, the fluid outlet <NUM> includes the first fluid outlet <NUM> and the second fluid outlet <NUM>, and the first fluid outlet <NUM> and the second fluid outlet <NUM> are disposed on two different housings, respectively, such arrangement is beneficial to simplify a mold. In an embodiment, only one fluid outlet may be provided, in which case the fluid outlet may be disposed on the first housing <NUM>.

The third housing <NUM> includes at least two first positioning holes <NUM>. Referring to <FIG>, in the present embodiment, the third housing <NUM> includes two first positioning holes <NUM>, where the first positioning holes <NUM> each are a through hole, and the two first positioning holes <NUM> are asymmetrically disposed along a central axis of the first housing <NUM>. The third housing <NUM> includes a first portion <NUM> and a second portion <NUM> that are integrally formed, where an outer peripheral diameter of the first portion <NUM> is less than that of the second portion <NUM>, and the first positioning holes <NUM> each are formed in the second portion <NUM>.

Referring to <FIG>, the second housing <NUM> includes an accommodating portion <NUM> formed with an accommodating cavity. Referring to <FIG>, the first rotor assembly <NUM> is disposed in the accommodating cavity. The second housing <NUM> includes at least two second positioning holes <NUM>. The at least two second positioning holes <NUM> each are a blind hole, the at least two second positioning holes <NUM> are asymmetrically distributed along a central axis of the second housing <NUM>, and positions of the second positioning holes <NUM> and positions of the first positioning holes <NUM> in <FIG> are correspondingly disposed. Referring to <FIG>, during assembling the third housing <NUM> with the second housing <NUM>, positioning posts on an external tooling are used, the first positioning holes <NUM> on the third housing <NUM> are fitted precisely with the positioning posts on the external tooling, the second positioning holes <NUM> on the second housing <NUM> are precisely fitted with the positioning post on the external tooling, so that during assembling the third housing <NUM> with the second housing <NUM>, the first positioning holes <NUM> and the second positioning holes <NUM> are used as positioning reference, and such arrangement is beneficial to improve assembly precision of the third housing <NUM> and the second housing <NUM>. In an embodiment, a positioning post may be formed on the third housing <NUM> and a positioning hole may be formed on the second housing <NUM> corresponding to the positioning post. Assembly precision of the second housing <NUM> and the third housing <NUM> is improved by clearance fit between the positioning post and the positioning hole. In another embodiment, a positioning hole may be formed on the third housing <NUM>, and a positioning post may be formed on the second housing <NUM> corresponding to the positioning hole.

Referring to <FIG>, along an axial direction of the second housing <NUM>, the second positioning hole <NUM> extends from the upper surface <NUM> of the second housing <NUM> toward the direction away from the upper surface <NUM> of the second housing <NUM>. Referring to <FIG>, the upper surface <NUM> of the second housing <NUM> is disposed in contact with the end surface <NUM> of the third housing <NUM> in <FIG>. The second housing <NUM> includes recess portions <NUM> that are recessed from the upper surface <NUM> of the second housing <NUM> toward the direction away from the upper surface <NUM> of the second housing <NUM>, and the recess portions <NUM> are distributed at intervals along a circumferential direction of the second housing <NUM>. In the present embodiment, the second housing <NUM> includes four recess portions <NUM>. The four recess protrusions <NUM> are provided to facilitate reducing weight of the second housing <NUM>, and to further enable a wall thickness of the second housing <NUM> as uniform as possible, thereby facilitating processing and shaping of the second housing. The second housing <NUM> includes a flange portion <NUM> that is arranged to protrude out from the upper surface <NUM> of the second housing <NUM> toward the direction away from the upper surface <NUM> of the second housing <NUM>. Referring to <FIG>, at least part of an outer peripheral side wall of the third housing <NUM> is in clearance fit with an inner peripheral side wall of the flange portion <NUM>, so that during assembling the third housing <NUM> with the second housing <NUM>, the third housing <NUM> is limited in a radial direction of the third housing <NUM>, thereby facilitating assembly of the third housing <NUM> and the second housing <NUM>.

Referring to <FIG>, the second housing <NUM> includes a stepped portion <NUM>. The stepped portion <NUM> includes a first limit surface <NUM> and a second limit surface <NUM> that are disposed perpendicular to each other, here, verticality within a processing error range is within the protection scope of the present application. Referring to <FIG>, the stator assembly <NUM> includes a stator iron core <NUM>. Referring to <FIG>, an outer peripheral side wall <NUM> of the stator iron core <NUM> is tightly fitted with the first limit surface <NUM> of the second housing <NUM> in <FIG>, and an end surface <NUM> of the stator iron core <NUM> is disposed in contact with the second limit surface <NUM> of the second housing <NUM> in <FIG>, so that during assembling the stator assembly <NUM> and the second housing <NUM>, the stator assembly <NUM> is limited in the axial direction and the circumferential direction of the stator assembly <NUM>. Referring to <FIG>, the stator assembly <NUM> includes an insulating frame <NUM> fixedly connected to the stator iron core <NUM>. In the present embodiment, the stator iron core <NUM> is used as an inserting member, the insulating frame <NUM> and the stator iron core <NUM> are integrally formed by injection molding, and the insulating frame <NUM> includes a third positioning hole <NUM>. Referring to <FIG>, the isolating member <NUM> includes a first positioning portion <NUM>. Referring to <FIG>, the first positioning portion <NUM> is inserted into the third positioning hole <NUM> of the stator assembly <NUM> in <FIG> and is correspondingly fitted with the third positioning hole <NUM>. Such arrangements facilitate positioning of the isolating member <NUM> and the stator assembly <NUM> during the assembly of the isolating member <NUM> with the stator assembly <NUM>, and avoiding misassembly of the isolating member <NUM>. In the present embodiment, the isolating member <NUM> includes two first positioning portions <NUM>. A number of the third positioning holes <NUM> is equal to a number of the first positioning portions <NUM>, and the first positioning portions <NUM> each have a cylindrical shape. In an embodiment, each of the first positioning portions <NUM> may also be square, D-shaped, circular-ring shaped, or other special-shaped structures.

Referring to <FIG>, the electric oil pump <NUM> includes the wiring terminal <NUM>, and at least part of the wiring terminal <NUM> passes through the isolating member <NUM> and is fixedly connected to the isolating member <NUM>. A first end of the wiring terminal <NUM> is connected to the stator assembly <NUM> in <FIG>, and a second end of the wiring terminal <NUM> is connected to the electric control board assembly <NUM>. The assembly of the wiring terminal <NUM> with the stator assembly <NUM> and the assembly of the wiring terminal <NUM> with the electric control board assembly <NUM> are described in detail below.

Referring to <FIG>, the wiring terminal <NUM> and the isolating member <NUM> are fixedly connected. In the present embodiment, the wiring terminal <NUM> is used as the inserting member, and the wiring terminal <NUM> is integrally formed with the isolating member <NUM> by injection molding to form one first assembly. Referring to <FIG>, during assembling the first assembly, the first positioning portion <NUM> is inserted into the third positioning hole <NUM> of the stator assembly <NUM> in <FIG> and is correspondingly fitted with the third positioning hole <NUM>, and at least part of the outer peripheral side wall of the isolating member <NUM> is tightly fitted with the inner peripheral side wall of the second housing <NUM>. In the present embodiment, the first assembly is assembled by press fitting, so that the first end of the wiring terminal <NUM> is connected to the stator assembly <NUM> in <FIG>. In the present embodiment, the upper surface <NUM> of the isolating member <NUM> is in contact with the stator assembly <NUM> in <FIG> to realize the axial limit of the isolating member <NUM>. Referring to <FIG>, the electric control board assembly <NUM> includes a connecting hole <NUM>, and the connecting hole <NUM> is correspondingly fitted with the wiring terminal <NUM> in <FIG>. In <FIG>, the second end of the wiring terminal <NUM> is inserted into and tightly fitted with the connecting hole <NUM>, so as to realize connection between the wiring terminal <NUM> and the electric control board assembly <NUM>.

Referring to <FIG>, the isolating member <NUM> includes at least two first protrusion portions <NUM> that are arranged to protrude out from a lower surface <NUM> of the isolating member <NUM> toward a direction away from the lower surface <NUM>, and the at least two first protrusion portions <NUM> are distributed at intervals along a circumferential direction of the isolating member <NUM>. In the present embodiment, the isolating member <NUM> includes five first protrusion portions <NUM>. With reference to <FIG>, on the one hand, the first protrusion portions <NUM> can provide support to the electric control board assembly <NUM> in <FIG>, and on the other hand, during assembling the electric control board assembly <NUM>, the arrangement of the first protrusion portions <NUM> can limit the electric control board assembly <NUM> in the axial direction of the electric control board assembly <NUM>, thereby facilitating the assembly of the electric control board assembly <NUM>.

Referring to <FIG>, the electric oil pump <NUM> includes the first housing <NUM> that capable of covering the electric control board assembly <NUM>. Referring to <FIG> and <FIG>, the first housing <NUM> includes a second positioning portion <NUM> that is arranged to protrude out from a lower surface <NUM> of the first housing <NUM>. Referring to <FIG>, the lower surface <NUM> of the first housing <NUM> is disposed in contact with a lower surface of the second housing <NUM>. Referring to <FIG>, the electric control board assembly <NUM> includes a base plate <NUM> that is configured as a carrier for mounting electrical components and laying wires. The base plate <NUM> includes a fourth positioning hole <NUM>, and the second positioning portion <NUM> is inserted into the fourth positioning hole <NUM> and is correspondingly arranged in clearance fit with the fourth positioning hole <NUM>, so that during assembling the first housing <NUM>, the second positioning portion <NUM> of the first housing <NUM> is in clearance fit with the fourth positioning hole <NUM> of the electric control board assembly <NUM>, thereby facilitating improvement of assembly precision of the first housing <NUM>. In the present embodiment, a number of the fourth positioning holes <NUM> is equal to a number of the second positioning portions <NUM>. In an embodiment, two second positioning portions <NUM> are provided, and the second positioning portion <NUM> each have a cylindrical shape. The second positioning portion <NUM> and the fourth positioning hole <NUM> are arranged in a shape-fit manner, and the "arranged in a shape-fit manner" here means that an outer contour of the second positioning portion <NUM> is substantially the same as a contour of the fourth positioning hole <NUM>. In other embodiments, the second positioning portion <NUM> may also be square, D-shaped, circular-ring shaped, or other special-shaped structures.

Referring to <FIG>, the first housing <NUM> includes a second protrusion portion <NUM> that is arranged to protrude out from an upper surface <NUM> of the first housing <NUM> toward a direction away from the upper surface <NUM> of the first housing <NUM>, and the second protrusion portion <NUM> is provided with a hollow cavity <NUM>. Referring to <FIG>, the electric control board assembly <NUM> includes a capacitor <NUM>. With reference to <FIG>, the capacitor <NUM> is disposed in the hollow cavity <NUM>. In the present embodiment, the second protrusion portion <NUM> is arranged to provide an accommodating space for the capacitor <NUM> on the electric control board assembly <NUM>, thereby preventing the capacitor <NUM> from interfering the assembly of the first housing <NUM>.

<FIG> is a structural schematic view illustrating an electric oil pump in the second implementation manner. Referring to <FIG>, the electric oil pump 100a further includes an isolating member 5a, where the isolating member 5a is at least partially disposed between the stator assembly <NUM> and the electric control board assembly <NUM>, and is detachably connected to the second housing <NUM> and the first housing <NUM>, respectively. In an embodiment, the isolating member 5a may be connected to the second housing <NUM> and the first housing <NUM> by a screw or a bolt, respectively. Referring to <FIG> and <FIG>, the isolating member 5a includes a boss portion 56a that is arranged to protrude out from a lower surface 55a toward a direction away from the lower surface 55a. The boss portion 56a includes a connecting portion 561a formed with a connecting hole 5611a, and the connecting hole 5611a is a through hole. Referring to <FIG>, the boss portion 56a is detachably connected to the second housing <NUM> and the first housing <NUM> by a screw or a bolt, respectively, and the screw or bolt sequentially passes through the connecting hole 5611a of the boss portion 56a and the connecting hole of the second housing <NUM> from the connecting hole of the first housing <NUM>.

Referring to <FIG>, the isolating member 5a includes a slot 50a disposed on an outer peripheral side wall of the isolating member 5a. Combined with <FIG>, the electric oil pump 100a includes a seal ring <NUM> disposed in the slot 50a of the isolating member 5a, and the isolating member 5a and the seal ring <NUM> can prevent the working medium from leaking along the outer peripheral side wall of the isolating member 5a through a connecting position between the isolating member 5a and the second housing <NUM>, thereby helping to prevent the working medium from leaking to an outside of the electric oil pump and affecting the performance of the electric oil pump.

Claim 1:
An electric oil pump, comprising:
a pump housing provided with an inner pump cavity, wherein the inner pump cavity comprises a first cavity (<NUM>) and a second cavity (<NUM>) that are in communication with each other;
a first rotor assembly (<NUM>) disposed in the first cavity (<NUM>);
a stator assembly (<NUM>) and a second rotor assembly (<NUM>) that are disposed in the second cavity (<NUM>); a pump shaft (<NUM>), wherein the first rotor assembly (<NUM>) is disposed adjacent to a first end of the pump shaft (<NUM>), part of the first rotor assembly (<NUM>) is connected to the pump shaft (<NUM>), and the second rotor assembly (<NUM>) is disposed adjacent to a second end of the pump shaft (<NUM>) and is connected to the pump shaft (<NUM>);
an electric control board assembly (<NUM>);
and characterised by comprising
an isolating member (<NUM>), wherein the stator assembly (<NUM>) is disposed at a first side of the isolating member (<NUM>), the electric control board assembly (<NUM>) is disposed at a second side of the isolating member (<NUM>), and the isolating member (<NUM>) is connected to the pump housing; and
a wiring terminal (<NUM>) fixedly connected to the isolating member (<NUM>);
wherein a connecting position between the wiring terminal (<NUM>) and the isolating member (<NUM>) is sealed and a connecting position between the isolating member (<NUM>) and the pump housing is sealed, so that the second cavity (<NUM>) is unable to communicate with one side of the isolating member (<NUM>) where the electric control board assembly (<NUM>) is located via the connecting position between the wiring terminal (<NUM>) and the isolating member (<NUM>), and via the connecting position between the isolating member (<NUM>) and the pump housing.