Electric oil pump

Abstract

The electric oil pump (100) includes a stator unit (4), a circuit board unit (5), and a pump housing (1), at least a portion of the pump housing (1) is electrically conductive, and at least one of a stator core (41) of the stator unit (4) and a reference ground layer of the circuit board unit (5) is electrically connected to a conductive portion in the pump housing (1). The electric oil pump (100) includes a conductive member (9) fixedly connected to the pump housing (1) or provided with a positional restriction, a portion of the conductive member (9) is electrically connected to the conductive portion in the pump housing (1), and at least a portion of an outer surface of another portion of the conductive member (9) constitutes a portion of the outer surface of the electric oil pump (100), which is thus advantageous for reducing electromagnetic radiation from the stator unit (4) and / or the circuit board unit (5), and further advantageous for reducing interference caused by electromagnetic radiation to electronic components of the circuit board unit (5) and / or other external devices.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with an application number of 202110339289.X, filed with the China National Intellectual Property Administration on March 30, 2021, and an invention title of "Electric Oil Pump", and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the field of vehicles, and in particular, to components of a lubrication system and / or a cooling system of a vehicle.

Background Art

[0003] An electric oil pump provides a power source for a lubrication system and / or a cooling system of a vehicle. The electric oil pump includes a stator unit and a circuit board unit. During the use of the electric oil pump, the circuit board unit and / or the stator unit may generate electromagnetic radiation, and this electromagnetic radiation may interfere with the electronic components of the circuit board unit and / or other external devices, and thus affect the performance or use of the electronic components and / or other external devices.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide an electric oil pump that is advantageous for reducing the electromagnetic radiation of the stator unit and / or the circuit board unit, and is advantageous for reducing the interference of the electromagnetic radiation on the electronic components of the circuit board unit and / or other external devices.

Means for Solving the Problems

[0005] To achieve the above object, the electric oil pump of the present invention includes a stator unit, a circuit board unit, and a pump housing. At least a part of the pump housing is conductive. At least one of the stator core of the stator unit and the reference ground layer of the circuit board unit is electrically connected to the conductive part in the pump housing, and includes a conductive member fixedly connected or provided with position limitation to the pump housing. A part of the conductive member is electrically connected to the conductive part in the pump housing, and at least a part of the outer surface of the other part of the conductive member constitutes a part of the outer surface of the electric oil pump.

[0006] In the above form, the outer surface of the other part of the conductive member can be provided in an exposed manner, and this conductive member can be mounted on an external grounding terminal. And a part of this conductive member is electrically connected to the conductive part in the pump housing, and at least one of the stator core of the stator unit and the reference ground layer of the circuit board unit is electrically connected to the conductive part in the pump housing. In this way, indirectly, it is equivalent to enabling at least one of the stator core of the stator unit and / or the reference ground layer of the circuit board unit to be grounded to the outside. In this way, it is advantageous for reducing electromagnetic radiation by the stator unit and / or the circuit board unit, and further advantageous for reducing interference of the electronic components of the circuit board unit and / or other external devices by electromagnetic radiation.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0008] The following further describes the present invention by combining the drawings and specific examples. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, it should be noted that the orientation terms such as up, down, left, right, front, back, inside, outside, top, bottom, etc. mentioned in this specification are defined with respect to the structures shown in the corresponding drawings, and since they are relative concepts, they may change according to different locations and different usage states where they are located. Therefore, these or other orientation terms should not be interpreted as limiting terms.

[0009] Hereinafter, the electric oil pump in the present embodiment can mainly provide power for the operating medium flowing in the lubrication system and / or cooling system of a vehicle. Specifically, it can provide power for the operating medium flowing in the lubrication system and / or cooling system in the vehicle transmission system.

[0010] Referring to FIGS. 1 and 2, the electric oil pump 100 includes a pump housing 1, a first rotor unit 2, a stator unit 4, a second rotor unit 3, and a circuit board unit 5. Here, this circuit board unit 5 may have a function of supplying power to the coil in the stator unit 4, or may have a function of controlling the operation of the first rotor unit 2 in real time according to the operating environment. The electric oil pump 100 has a pump inner chamber, and the first rotor unit 2, the stator unit 4, the second rotor unit 3, and the circuit board unit 5 are provided in the pump inner chamber. In this embodiment, the pump inner chamber includes a first chamber 70, a second chamber 80, and a third chamber 90. The first rotor unit 2 is provided in the first chamber 70, the stator unit 4 and the second rotor unit 3 are provided in the second chamber 80, the circuit board unit 5 is provided in the third chamber 90, the first chamber 70 communicates with the second chamber 80, and this second chamber 80 does not communicate with the third chamber 90. The stator unit 4 includes a stator core 41, an insulating holder 42 covering at least a part of the surface of at least the stator core 41, and a winding 43 wound around the insulating holder 42. When the electric oil pump 100 operates, the circuit board unit 5 controls the stator unit 4 to generate a changing excitation magnetic field by controlling the current flowing through the winding 43 of the stator unit 4 to change according to a predetermined law. The second rotor unit 3 rotates under the action of the excitation magnetic field, and the second rotor unit 3 can directly or indirectly rotate the first rotor unit 2. When the first rotor unit 2 rotates, the volume of the hydraulic chamber between the first rotor units 2 changes, so that the working medium is pushed out to the outlet, and a flowing power is generated. In this embodiment, at least a part of the working medium in the first chamber 70 can flow out into the second chamber 80. Since the stator unit 4 is provided in the second chamber 80, in this way, the working medium located in the second chamber 80 can cool the stator unit 4, which is advantageous for the heat dissipation of the stator unit 4. In this embodiment, the working medium is cooling oil.

[0011] Referring to FIGS. 1 to 3, the first rotor unit 2 includes a first rotor 21 including a plurality of internal teeth and a second rotor 22 including a plurality of external teeth, and a hydraulic chamber 701 is formed between the internal teeth of the first rotor 21 and the external teeth of the second rotor 22. In this embodiment, the hydraulic chamber is also a part of the first chamber 70. In this embodiment, the first rotor 21 is externally inserted on the outer periphery of the second rotor 22. Referring to FIG. 1 again, the electric oil pump further includes an inlet 10 and an outlet (not shown). The working medium can enter the hydraulic chamber 701 through the inlet 10, and the working medium can exit the hydraulic chamber 701 through the outlet (not shown). There is a certain eccentric distance between the first rotor 21 and the second rotor 22. When the second rotor 22 rotates, some of the external teeth of the second rotor 22 mesh with some of the internal teeth of the first rotor 21, rotating the first rotor 21. During the process of one rotation of the first rotor 21 and the second rotor 22, the volume in the hydraulic chamber 701 changes. Specifically, when the first rotor unit 2 rotates from the starting point to a certain angle, the volume in the hydraulic chamber 701 gradually increases to form a local vacuum, and the working medium is sucked from the inlet 10 into the hydraulic chamber 701. When the first rotor 21 and the second rotor 22 continue to rotate, the volume of the hydraulic chamber 701 originally filled with the working medium gradually decreases and the working medium is pressed, so that the working medium that has entered the hydraulic chamber 701 is pushed out to the outlet (not shown), generating a flowing power. In this embodiment, the electric oil pump 100 further includes a pump shaft 6. The pump shaft 6 can rotate a part of the first rotor unit 2. Specifically, in this embodiment, the pump shaft 6 can rotate the second rotor 22. In this embodiment, the pump shaft 6 is connected to the second rotor 22, and the pump shaft 6 is connected to the second rotor unit 3. This second rotor unit 3 rotates the second rotor 22 by the pump shaft 6, enabling the rotation of the first rotor unit 2.

[0012] As shown in FIGS. 1 and 2, the electric oil pump 100 includes a pump housing 1 that is at least partially conductive. The stator core 41 of the stator unit 4 is electrically connected to the conductive portion in the pump housing 1. Specifically, the stator core 41 of the stator unit 4 realizes electrical connection by contacting the conductive portion in the pump housing 1, and the reference ground layer of the circuit board unit 5 may be electrically connected to the conductive portion in the pump housing 1. Specifically, the electric oil pump 100 includes a conductive member 7 and a ground pin 8. The conductive member 7 is fixedly connected to or position-limited to the ground pin 8, or integrally provided. The ground pin 8 is directly electrically connected to the reference ground layer of the circuit board unit 5. The ground pin 8 is electrically connected to the reference ground layer of the circuit board unit 5 and the conductive member 7. The conductive member 7 is electrically connected to the ground pin 8 and the conductive portion in the pump housing 1. With the above configuration, electrical connection between the reference ground layer of the circuit board unit 5 and the conductive portion in the pump housing 1 is realized. In this embodiment, both the stator core 41 of the stator unit 4 and the reference ground layer of the circuit board unit 5 are electrically connected to the conductive portion in the pump housing. As another embodiment, one of the stator core 41 of the stator unit 4 and the reference ground layer of the circuit board unit 5 may be electrically connected to the conductive portion in the pump housing 1. Here, the reference ground layer of this circuit board unit 5 is the zero electric potential point of the electrical system.

[0013] Referring to FIGS. 1 and 2, the electric oil pump 100 includes a conductive member 9 fixedly connected to or position-limited to the pump housing 1. A part of the conductive member 9 is electrically connected to the conductive portion in the pump housing, and at least a part of the outer surface of another part of the conductive member 9 constitutes a part of the outer surface of the electric oil pump 100. In this way, a part of the outer surface of the other part of the conductive member 9 can be provided to be exposed. With the above-described configuration, the exposed conductive member 9 can be mounted on an external ground terminal. Here, the "external" mentioned below may be a lubrication system and / or a cooling system of the vehicle, or may be a vehicle body or another system of the vehicle. A part of the conductive member 9 is electrically connected to a conductive portion in the pump housing, and at least one of the stator core 41 of the stator unit 4 and the reference ground layer of the circuit board unit 5 is electrically connected to the conductive portion in the pump housing. In this way, it is equivalent to enabling at least one of the stator core 41 of the stator unit 4 and / or the reference ground layer of the circuit board unit 5 to be grounded indirectly. In this way, it is advantageous for reducing electromagnetic radiation by the stator unit 4 and / or the circuit board unit 5, and further, it is advantageous for reducing interference of the electronic components of the circuit board unit 5 and / or other external devices due to electromagnetic radiation.

[0014] Regarding the content of the above description, the present invention discloses three embodiments of an electric oil pump, and the following will introduce these three embodiments in detail.

[0015] FIG. 1 and FIG. 2 are configuration diagrams of an electric oil pump according to a first embodiment of the present invention, and the following will introduce the configuration of the electric oil pump according to the first embodiment in detail.

[0016] As shown in FIGS. 1 and 2, the pump housing 1 includes a first housing 11 that can conduct electricity. The first housing 11 has a first housing inner chamber 110 that forms a part of the second chamber 80. In this embodiment, the stator unit 4 is located in the first housing inner chamber 110, and a part of the stator unit 4 may be located in the first housing inner chamber 110. As shown in FIG. 2, the stator core 41 of the stator unit 4 is conductively connected to a corresponding side wall in the first housing inner chamber 110. Specifically, in this embodiment, between the stator core 41 of the stator unit 4 and the corresponding side wall in the inner chamber 110 of the first housing, direct contact between both is realized by means of interference fit, and further, conductive connection between both is realized. Of course, as another embodiment, other conductive components may be provided between both to realize indirect conductive connection. It should be noted here that in this embodiment, the first housing 11 is integral, but as another embodiment, the first housing 11 may be separate, that is, the first housing 11 can be assembled from two or more parts.

[0017] As shown in FIGS. 1 and 2, in this embodiment, the central axis of the conductive member 9 is installed parallel to the height direction of the first housing 11. Then, along the height direction of the electric oil pump 100, a part of the conductive member 9 projects from the first housing 11, and at least a part of the outer surface of the conductive member 9 projecting from the first housing 11 constitutes a part of the outer surface of the electric oil pump 100 and is exposed.

[0018] As shown in FIGS. 1 to 5, in this embodiment, the conductive member 9 is fixedly installed with the first housing 11. Specifically, the conductive member 9 includes a connection portion 91, and male threads 911 are formed on at least a part of the outer peripheral surface of the connection portion 91. The first housing 11 has a threaded hole 111. The male threads 911 of the connection portion 91 and the female threads of the threaded hole 111 are fitted and installed, whereby the conductive member 9 is fixedly installed on the first housing 11.

[0019] As shown in FIGS. 4 and 5, the connection portion 91 has a housing chamber 910. Furthermore, the conductive member 9 includes a contact portion 92, an elastic portion 93, and a lid portion 94. At least a part of the contact portion 92, the elastic portion 93, and at least a part of the lid portion 94 are located in the housing chamber 910. Along the height direction of the conductive member 9, at least a part of the elastic portion 93 is located between the contact portion 92 and the lid portion 94. One end of the elastic portion 93 abuts against the contact portion 92, and the other end of the elastic portion 93 abuts against the lid portion 94. In this embodiment, the elastic part 93 is a spring. As shown in FIGS. 4 and 5, in this embodiment, the lid part 94 is connected to the connection part 91. Specifically, a male thread is formed on the outer peripheral surface of the lid part 94, and a female thread is provided on the corresponding inner peripheral wall in the accommodation chamber 910. The male thread on the outer peripheral surface of the lid part 94 and the female thread on the corresponding inner peripheral wall in the accommodation chamber 910 are fitted and installed to realize the connection between the lid part 94 and the connection part 91. Referring to FIGS. 4 and 5, the lid part 94 has a groove 941 that extends from the lower end surface of the lid part 94 to the upper end surface of the lid part 94 and does not penetrate the upper end surface of the lid part 94. By providing the groove 941, it is easy to align the external driver with the groove 941. On the one hand, it is advantageous for the detachment of the lid part 94, and on the other hand, it is advantageous for the torsion of the lid part 94. Furthermore, since the compression amount of the elastic part 93 can be adjusted, it is advantageous for adjusting the magnitude of the biasing force of the elastic part 93 on the contact part 92.

[0020] As shown in FIGS. 4 and 5, along the height direction of the conductive member 9, a part of the contact part 92 protrudes from the connection part 91, and at least a part of the outer surface of the contact part 92 that protrudes from the connection part 91 constitutes a part of the outer surface of the electric oil pump 100. In this way, it is possible to expose the contact part 92 that protrudes from the connection part 91. In this embodiment, the contact part 92, the elastic part 93, and the lid part 94 are all conductive. In this embodiment, the contact part 92 that protrudes and is exposed from the connection part 91 can be mounted on an external ground terminal. The contact part 92 abuts against one end of the elastic part 93, the other end of the elastic part 93 abuts against the lid part 94, the lid part 94 is in contact connection with the connection part 91, and the connection part 91 is in contact connection with the first housing 11 in FIG. 2. Therefore, in this way, indirectly, it is equivalent to enabling the stator core 41 of the stator unit 4 and the reference ground layer of the circuit board unit 5 in FIG. 2 to be grounded externally. In this way, it is advantageous for reducing the electromagnetic radiation by the stator unit 4 and the circuit board unit 5, and furthermore, it is advantageous for reducing the interference of the electronic components of the circuit board unit 5 and / or other external devices caused by the electromagnetic radiation.

[0021] Referring to FIGS. 4 and 5, when an external force acts on the contact portion 92, the contact portion 92 is movable along the compression direction of the elastic portion 93. And when the external force acting on the contact portion 92 is released, the contact portion 92 is movable along the extension direction of the elastic portion 93, and in the above form, it is advantageous for improving the reliability of the contact between the conductive member 9 and the external system.

[0022] Specifically, as shown in FIG. 5, the connecting portion 91 has a first hole 912 extending from the upper end surface of the connecting portion 91 to a direction approaching the lower end surface of the connecting portion 91 along the height direction of the connecting portion 91. The accommodating chamber 910 extends from the lower end surface of the connecting portion 91 to a direction approaching the upper end surface of the connecting portion 91. The first hole 912 communicates with the accommodating chamber 910. The radial dimension of the corresponding side wall in the first hole 912 is smaller than the radial dimension of the corresponding side wall in the accommodating chamber 910. The contact portion 92 includes a first portion 921 and a second portion 922. The first portion 921 and the second portion 922 are connected. And the outer edge of the first portion 921 is closer to the central axis of the contact portion 92 than the outer edge of the second portion 922, that is, the radial dimension of the outer edge of the first portion 921 is smaller than the radial dimension of the outer edge of the second portion 922. The second portion 922 is located in the accommodating chamber 910. The upper end of the elastic portion 93 abuts against the second portion 922. The first portion 921 passes through the first hole 912, and one end of the first portion 921 protrudes from the connecting portion 91. In this embodiment, the connecting portion 91 includes the first portion 921 and the second portion 922. As another embodiment, the connecting portion 91 may be spherical or other shapes.

[0023] As shown in FIG. 1, the pump housing 1 includes a pump lid 12. In this embodiment, the material of the pump cover 12 is plastic. The pump cover 12 has no electrical conductivity. The pump cover 12 is supported by the first housing 11 and fixedly connected to the first housing 11. At least a part of the pump cover 12 covers the first rotor unit. The pump cover 12 has a through hole 120 that penetrates the pump cover 12 along the height direction of the pump cover 12. The conductive member 9 passes through the through hole 120. Referring to FIG. 2, in this embodiment, the conductive member 9 is located in the extending direction in the radial direction of the first rotor unit 2.

[0024] FIG. 6 is a configuration diagram of an electric oil pump according to the second embodiment of the present invention. The following is a detailed introduction to the configuration of the electric oil pump according to the second embodiment.

[0025] As shown in FIGS. 6 and 7, in this embodiment, the conductive member 9a is fixedly connected to the outer wall of the first housing 11 by welding, and a part of the conductive member 9a has elasticity. Specifically, as shown in FIGS. 6 and 7, the conductive member 9a includes a first fixing portion 95a, a second fixing portion 96a, and a protrusion portion 97a. The protrusion portion 97a connects the first fixing portion 95a and the second fixing portion 96a. The first fixing portion 95a and the second fixing portion 96a are fixedly connected to the side wall of the first housing 11 by welding. The protrusion portion 97a protrudes from the first fixing portion 95a. There is a gap between the protrusion portion 97a and the outer wall of the first housing 11. At least a part of the upper surface of the protrusion portion 97a constitutes the outer surface of the electric oil pump 100a. In this way, the upper surface of the protrusion portion 97a is provided in an exposed manner, and the protrusion portion 97a is used to contact the outside. In this embodiment, the upper surface of the protruding portion 97a located outside and exposed outside the first housing 11 can be mounted on an external ground terminal. In this way, indirectly, it is equivalent to enabling the stator core of the stator unit and the reference ground layer of the circuit board unit to be grounded to the external system. In this way, it is advantageous for reducing electromagnetic radiation by the stator unit and the circuit board unit. Furthermore, it is advantageous for reducing interference of the electronic components of the circuit board unit and / or other external devices due to electromagnetic radiation. As shown in FIGS. 6 and 7, the protruding portion 97a has elasticity, and thus is advantageous for improving the reliability of the contact between the conductive member 9a and the external system. In this embodiment, the conductive member 9a includes a first fixing portion 95a, a second fixing portion 96a, and a protruding portion 97a. As another embodiment, the conductive member 9a may have other morphological structures.

[0026] As shown in FIG. 6, the electric oil pump 100a includes a first seal ring 101 and a second seal ring 102 that are externally inserted into the outer wall of the first housing 11. Then, along the height direction of the first housing 11, the first seal ring 101 and the second seal ring 102 are provided at a preset distance. The conductive member 9a is located between the first seal ring 101 and the second seal ring 102. Regarding other features in this embodiment, reference may be made to the electric oil pump of the first embodiment, and thus it will not be described here.

[0027] FIG. 8 is a configuration diagram of an electric oil pump according to the third embodiment of the present invention. The following will introduce in detail the configuration of the electric oil pump according to the third embodiment.

[0028] As shown in FIGS. 8 to 11, the pump housing 1 includes a bottom cover 13 that at least partially covers the circuit board unit 5 in FIG. 2. The conductive member 9b includes a position limiting portion 98b. Along the height direction of the electric oil pump 100b, the position limiting portion 98b is located between the first housing 11 and the bottom cover 13. And this position limiting portion 98b is conductively connected to the first housing 11. Specifically, as shown in FIG. 8, the pump housing 1 further includes a second housing 14 made of plastic. Along the height direction of the electric oil pump 100b, the second housing 14 is located between the first housing 11 and the bottom cover 13. In this embodiment, the position limiting portion 98b is located between the second housing 14 and the bottom cover 13. Of course, as other embodiments, only a part of the position limiting portion 98b may be located between the second housing 14 and the bottom cover 13, or the position limiting portion 98b may be fitted into the second housing 14 or the bottom cover 13. As shown in FIG. 8, the screw or bolt 103 passes through the bottom cover 13, the position limiting portion 98b, the second housing 14, and the first housing 11. The screw or bolt 103 is conductive and can be conductively connected to the first housing 11 and the position limiting portion 98b. Specifically, in this embodiment, both the conductive connections between the screw or bolt 103 and the first housing 11 are realized by screw connection, and both the conductive connections between the screw or bolt 103 and the through hole 981b of the position limiting portion 98b are realized by an interference fit method. In this embodiment, the electric oil pump 100b includes the second housing 14. As other embodiments, the second housing 14 may not be provided.

[0029] As shown in FIGS. 8 to 11, the conductive member 9b includes a branch portion 99b connected to the position limiting portion 98b. At least a part of the upper surface of the branch portion 99b constitutes a part of the outer surface of the electric oil pump 100b. In this way, the upper surface of the branch portion 99b can be provided to be exposed, and this branch portion 99b is for conductive connection with the outside. In this embodiment, the upper surface of the exposed branch portion 99b can be mounted on an external ground terminal. In this way, indirectly, it is equivalent to enabling the stator core of the stator unit and the reference ground layer of the circuit board unit to be grounded to the external system. In this way, it is advantageous for reducing electromagnetic radiation by the stator unit and the circuit board unit, and is advantageous for reducing interference of the electronic components of the circuit board unit 5 and / or other external devices due to electromagnetic radiation.

[0030] As shown in FIG. 10, the bottom cover 13 includes a mounting portion 131 protruding along the radial direction of the pump cover. The mounting portion 131 has a mounting hole 1310 penetrating the mounting portion 131 along the thickness direction of the mounting portion 131. In this embodiment, the mounting hole 1310 is mainly used for fixed connection with an external system. As shown in FIGS. 8 to 11, the branch portion 99b is supported by the mounting portion 131 and is provided in contact with the upper surface of the mounting portion 131. And this branch portion 99b has a through hole 991b penetrating the branch portion 99b along the thickness direction of the branch portion 99b, and this through hole 991b communicates with the mounting hole 1310. In this way, when mounting the electric oil pump 100b to an external system, an external connection device can pass through the mounting hole 1310 and the through hole 991b, so that the upper surface of the branch portion 99b can contact the external system.

[0031] The above embodiments do not limit the present invention, but are for explaining the present invention. Although this specification has described the present invention in detail with reference to the embodiments, corrections or equivalent substitutions can be made to the present invention, and all improvements that do not depart from the spirit and scope of the present invention all fall within the scope of the claims of the present invention.

Claims

1. An electric oil pump including a stator unit, a circuit board unit, and a pump housing, wherein the pump housing includes a first conductive housing, at least one of the stator core of the stator unit and the reference ground layer of the circuit board unit is electrically connected to a conductive portion in the first housing, including a conductive member fixedly connected to or provided with position limitation on the first housing, a part of the conductive member is in direct contact with and electrically connected to a conductive portion in the first housing, and at least a part of the outer surface of another part of the conductive member constitutes a part of the outer surface of the electric oil pump.

2. The first housing has a first housing inner chamber, at least a part of the stator unit is located in the first housing inner chamber, the stator core of the stator unit is conductively connected to a corresponding side wall in the first housing inner chamber, and the conductive member is fixedly installed on the first housing. The electric oil pump according to claim 1, characterized in that.

3. The central axis of the conductive member is installed parallel to the height direction of the first housing, along the height direction of the electric oil pump, a part of the conductive member projects from the first housing, and the outer surface of the conductive member projecting from the first housing constitutes a part of the outer surface of the electric oil pump. The electric oil pump according to claim 2, characterized in that.

4. The conductive member includes a connection portion, at least a part of the outer peripheral surface of the connection portion is formed with male threads, the first housing has a threaded hole, and the male threads of the connection portion and the female threads of the threaded hole are fitted and installed. The electric oil pump according to claim 3, characterized in that.

5. The connection portion has an accommodation chamber, the conductive member includes a contact portion, an elastic portion, and a cover portion, at least a part of a part of the contact portion, the elastic portion, and the cover portion is located in the accommodation chamber, the cover portion is connected to the connection portion, along the height direction of the conductive member, a part of the contact portion projects from the connection portion, the outer surface of the contact portion projecting from the connection portion constitutes a part of the outer surface of the electric oil pump, and at least a part of the elastic portion is located between the contact portion and the cover portion along the height direction of the conductive member. One end of the elastic part abuts against the contact part. The other end of the elastic part abuts against the lid part. When an external force acts on the contact part, the contact part is movable along the compression direction of the elastic part. When the external force acting on the contact part is released, the contact part is movable along the extension direction of the elastic part. The electric oil pump according to claim 4, characterized in that.

6. The pump housing includes a pump lid that does not have conductivity. The pump lid is supported by the first housing and fixedly connected to the first housing. The electric oil pump includes a first rotor unit. At least a part of the pump lid covers the first rotor unit. The pump lid has a through hole through which the conductive member passes. The conductive member is located in the extending direction in the radial direction of the first rotor unit. The electric oil pump according to any one of claims 3 to 5, characterized in that.

7. The conductive member is fixedly connected to the outer wall of the first housing by welding. A part of the conductive member has elasticity. The electric oil pump according to claim 2, characterized in that.

8. The conductive member includes a first fixing part, a second fixing part, and a protruding part. The protruding part connects the first fixing part and the second fixing part. The first fixing part and the second fixing part are fixedly connected to the side wall of the first housing by welding. The protruding part protrudes from the first fixing part. There is a gap between the protruding part and the outer wall of the first housing. The protruding part has elasticity. The upper surface of the protruding part constitutes a part of the outer surface of the electric oil pump. The electric oil pump according to claim 7, characterized in that.

9. It includes a first seal ring and a second seal ring externally inserted into the outer wall of the first housing. The first seal ring and the second seal ring are provided at a preset distance along the height direction of the first housing. The conductive member is located between the first seal ring and the second seal ring. The electric oil pump according to claim 7 or claim 8, characterized in that.

10. The pump housing includes a bottom lid that at least partially covers the circuit board unit. The conductive member includes a position limiting part and a branch part that are connected to each other. The position limiting part is located between the first housing and the bottom cover along the height direction of the electric oil pump, The position limiting part is conductively connected to the first housing, The electric oil pump according to claim 1, wherein at least a part of the upper surface of the branch portion constitutes a part of the outer surface of the electric oil pump.

11. The bottom cover includes a mounting portion protruding along the radial direction of the bottom cover, The mounting portion has a mounting hole penetrating the mounting portion along the thickness direction of the mounting portion, The branch portion is supported by the mounting portion and is provided in contact with the upper surface of the mounting portion, The branch portion has a through hole penetrating the branch portion along the thickness direction of the branch portion, The electric oil pump according to claim 10, wherein the through hole communicates with the mounting hole.

12. The pump housing includes a second housing made of plastic, Along the height direction of the electric oil pump, the second housing is located between the first housing and the bottom cover, The branch portion is located between the second housing and the bottom cover, The screw or bolt passes through the bottom cover, the branch portion, the second housing and the first housing, The screw or bolt is electrically conductive, The electric oil pump according to claim 10 or claim 11, wherein the screw or bolt is in contact with the first housing and the branch portion.

Images