Electric oil pump and vehicle

Abstract

An electric oil pump includes: a pump housing; the pump cover seals the first end of the pump shell, and an oil inlet and an oil outlet are formed in the pump cover; the PCBA assembly is provided with a PCBA shell, a PCBA cover and a PCBA board, the pump cover, the pump shell and the PCBA shell jointly at least partially surround to form a first space, and the PCBA shell and the PCBA cover jointly at least partially surround to form a second space; a shaft disposed coaxially with the pump housing in the first space; the bearing assembly is provided with a bearing seat and a bearing, the bearing is arranged in the bearing seat, and the bearing is arranged around the shaft; a stator assembly; a rotor assembly; wherein the bearing seat and the PCBA shell are integrally formed.

Description

Technical Field

[0001] The present invention relates to an electric oil pump and a vehicle using the electric oil pump, and more particularly, to an electric oil pump with a simpler structure and a vehicle using the electric oil pump with a simpler structure. Background Art

[0002] The electric oil pump controls the oil delivery by controlling the motor through the PCBA, and requires bearings to support the rotation of the motor. In existing electric oil pumps, the way the bearings are fixed makes the structure of the electric oil pump more complex and the cost higher.

[0003] Therefore, it is desired to provide an electric oil pump with a simpler structure and lower cost. Summary of the Invention

[0004] According to a first aspect of the present invention, an electric oil pump is proposed, comprising: a pump housing having a cylindrical shape; a pump cover arranged at a first end of the pump housing and closing the first end of the pump housing; a PCBA assembly having a PCBA housing and a PCBA board, the PCBA housing being arranged at a second end of the pump housing opposite to the first end, the pump cover, the pump housing and the PCBA housing together at least partially enclosing a first space; a shaft being coaxially arranged in the first space with the pump housing; a bearing assembly being arranged in the first space, having a bearing seat and a bearing, the bearing being arranged in the bearing seat, and the bearing being arranged around the shaft; a stator assembly being arranged in the first space and fixed to the pump housing; a rotor assembly being arranged in the first space and capable of rotating relative to the stator assembly around a rotation axis, the rotation axis being colinear with a central axis of the pump housing; wherein the bearing seat is formed integrally with the PCBA housing.

[0005] According to this solution, the bearing seat and the PCBA housing are formed integrally, so that the structure of the electric oil pump is simpler and the cost is lower.

[0006] The electric oil pump according to the present invention may further have one or more of the following features, alone or in combination.

[0007] In some solutions, the PCBA housing may further include a PCBA cover. The PCBA housing and the PCBA cover together at least partially enclose a second space, and the PCBA board is disposed in the second space.

[0008] In some aspects, the bearing housing may be overmolded to the PCBA housing.

[0009] In some aspects, the pump housing may have a bearing portion disposed around the shaft and proximate the first end of the pump housing.

[0010] In some aspects, the PCBA housing may completely enclose the second end of the pump housing.

[0011] According to this solution, the second space is isolated from the first space, so that the PCBA board in the second space will not be adversely affected by the oil in the first space.

[0012] In some solutions, the PCBA assembly may further include a thermally conductive adhesive, with two sides of the thermally conductive adhesive connected to the PCBA board and the PCBA cover, respectively.

[0013] According to this solution, the heat generated by the PCBA board during operation can be dissipated from the PCBA cover to the outside of the electric oil pump through the thermal conductive adhesive to avoid excessive temperature of the PCBA board.

[0014] In some aspects, the first space may be in communication with the second space.

[0015] In some solutions, the PCBA housing may be provided with at least one through hole, and the first space and the second space are connected through the through hole.

[0016] According to this solution, the oil in the first space can enter the second space, and the heat generated by the PCBA board during operation can be transferred to the outside of the electric oil pump through the oil to prevent the temperature of the PCBA board from being too high.

[0017] In some embodiments, the PCBA assembly may further include a pin, one end of the pin being electrically connected to the PCBA board and the other end of the pin extending from the PCBA housing.

[0018] According to this solution, a signal can be transmitted from the outside to the PCBA board through the pin to control the operating mode of the electric oil pump.

[0019] In some aspects, the stator assembly can be a segmented stator.

[0020] In some solutions, the pump cover may be provided with an oil inlet and an oil outlet.

[0021] According to a second aspect of the present invention, a vehicle is provided. The vehicle includes the electric oil pump according to the first aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 shows a schematic diagram of an electric oil pump according to an embodiment of the present invention;

[0023] Figure 2 shows a cross-sectional view of an electric oil pump according to a first embodiment of the present invention;

[0024] Figure 3 shows a cross-sectional view of an electric oil pump according to a second embodiment of the present invention;

[0025] Figure 4A schematic diagram of a PCBA housing according to a first embodiment of the present invention is shown;

[0026] Figure 5 FIG. 1 is a schematic diagram of a PCBA housing according to a second embodiment of the present invention.

[0027] Reference numerals

[0028] 100 Electric oil pump

[0029] 110 Pump housing

[0030] 112 First End

[0031] 114 Second End

[0032] 116 Bearing

[0033] 120 Pump cover

[0034] 122 Oil inlet

[0035] 124 oil outlet

[0036] 130PCBA components

[0037] 132PCBA housing

[0038] 134PCBA cover

[0039] 136PCBA board

[0040] 138 pins

[0041] 140 axis

[0042] 152 bearing seat

[0043] 154 bearings

[0044] 160 stator assembly

[0045] 170 rotor assembly

[0046] 200 Electric oil pump

[0047] 232PCBA housing

[0048] 233 through hole

[0049] S1 First Space

[0050] S2 Second Space DETAILED DESCRIPTION

[0051] In order to make the purpose, scheme and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0052] Figure 1 A schematic diagram of an electric oil pump 100 according to an embodiment of the present invention is shown. The electric oil pump primarily includes a substantially cylindrical pump housing 110 (having a central axis), a pump cover 120, and a PCBA assembly 130. The pump cover 120 is disposed at a first end 112 of the pump housing 110 and closes the first end 112 of the pump housing 110. The pump cover 120 may be provided with an oil inlet 122 and an oil outlet 124. Oil enters the electric oil pump 100 through the oil inlet 122 and exits the electric oil pump 100 through the oil outlet 124. The PCBA assembly 130 includes a PCBA housing 132 disposed at a second end 114 of the pump housing 110. The pump cover 120, the pump housing 110, and the PCBA housing 132 together at least partially enclose a first space S1. The PCBA assembly 130 may also include a PCBA cover 134. The PCBA housing 132 and the PCBA cover 134 together at least partially enclose a second space S2.

[0053] Figure 2 A cross-sectional view of an electric oil pump 100 according to a first embodiment of the present invention is shown. A shaft 140 coaxially arranged with a pump housing 110, a bearing assembly (including a bearing seat 152 and a bearing 154 disposed within the bearing seat 152), a stator assembly 160 secured to the pump housing 110 (preferably, the stator assembly 160 may be a segmented stator), and a rotor assembly 170 are disposed in a first space S1. Oil delivery is controlled by the rotation of the rotor assembly 170 relative to the stator assembly 160 about a central axis. Bearings 154 are disposed around the shaft 140 to provide support. A PCBA board 136 is disposed in a second space S2. The PCBA board 136 can receive external input signals to control the operating mode of the electric oil pump 100.

[0054] In order to manufacture an electric oil pump 100 with a simpler structure and lower cost, the bearing seat 152 of the present invention is formed integrally with the PCBA housing 132. The integral formation of the bearing seat 152 and the PCBA housing 132 saves space and reduces costs (for example, no screws or other parts are required) compared to other fixed connection methods (for example, screw connection). Specifically, in terms of space saving, the axial length of the electric oil pump 100 of the present invention (the dimension along the extension direction of the shaft 140, i.e., the dimension along the extension direction of the shaft 140) is 1 / 4" (1 / 4"). Figure 2The left and right dimensions in the middle are about 102 mm, and the width (the dimension along the extension direction of the PCBA housing 132, i.e., along the Figure 2 The vertical dimension is approximately 128 mm.

[0055] In some embodiments, the bearing seat 152 can be overmolded onto the PCBA housing 132. It should be understood that the present invention is not intended to limit the specific form of the integral formation of the bearing seat 152 and the PCBA housing 132, and the bearing seat 152 and the PCBA housing 132 can also be integrally formed in any other suitable manner.

[0056] In some embodiments, the pump housing 110 may include a bearing portion 116 disposed around the shaft 140 and proximate the first end 112 of the pump housing 110. The bearing portion 116 may provide more support for the shaft 140 to enhance the stability of the shaft 140, thereby further improving the operational stability of the electric oil pump 100.

[0057] In some embodiments, such as Figure 2 As shown, the PCBA housing 132 can completely enclose the second end 114 of the pump housing 110 (ie, as shown in FIG. Figure 4 As shown, there is no hole connecting the first space S1 and the second space S2 on the PCBA housing 132, so that the second space S2 is isolated from the first space S1, so that the PCBA board 136 in the second space S2 will not be adversely affected by the oil in the first space S1.

[0058] In this case, PCBA 136 is not immersed in the oil and remains dry, preventing the oil from dissipating the heat generated by PCBA 136 during operation. Therefore, PCBA assembly 130 preferably further includes thermally conductive adhesive (not shown), with two ends of the adhesive connected to PCBA 136 and PCBA cover 134, respectively. This allows heat generated by PCBA 136 during operation to be dissipated through PCBA cover 134 to the exterior of electric oil pump 100 via the thermally conductive adhesive, preventing overheating of PCBA 136.

[0059] In some embodiments, such as Figure 3 As shown, the first space S1 can be connected to the second space S2. For example, the PCBA housing 232 can be provided with at least one through hole 233 (such as Figure 5As shown, the first space S1 and the second space S2 are connected via through-holes 233. This allows the oil in the first space S1 to enter the second space S2, and the heat generated by the PCBA board 136 during operation can be transferred to the exterior of the electric oil pump 100 through the oil (first from the second space S2 to the first space S1, and then from the first space S1 to the exterior of the electric oil pump 100 via the oil outlet 124 of the pump cover 120), thereby preventing the PCBA board 136 from overheating. It should be understood that the present invention is not intended to limit the number and location of through-holes 233. The PCBA housing 232 may have one, two, four, or any other suitable number of through-holes 233. The through-holes 233 may be arranged symmetrically around the central axis or in any other suitable manner.

[0060] In some embodiments, PCBA assembly 130 may further include pins 138 , one end of which is electrically connected to PCBA board 136 , and the other end of which extends from PCBA housing 132 (e.g., to be connected to an external controller). In this manner, signals can be transmitted from an external source to PCBA board 136 via pins 138 to control the operating mode of electric oil pump 100 .

[0061] The electric oil pump 100 according to the embodiment of the present invention can be applied to vehicles. Since the electric oil pump 100 has a simple structure and low cost, the arrangement of the electric oil pump in the vehicle is more flexible, while also reducing the cost of the vehicle.

[0062] This document describes in detail several exemplary embodiments of the present invention with reference to preferred embodiments. However, it will be understood by those skilled in the art that various modifications and variations may be made to the above-mentioned specific embodiments without departing from the spirit of the present invention, and that the various technical features and structures proposed in the present invention may be combined without exceeding the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. An electric oil pump, characterized in that: include: Pump housing; a pump cover disposed at the first end of the pump housing and closing the first end of the pump housing; A PCBA assembly includes a PCBA housing, a PCBA cover, and a PCBA board, wherein the PCBA housing is disposed at a second end of the pump housing opposite to the first end, and the pump cover, the pump housing, and the PCBA housing together at least partially enclose a first space; a shaft, coaxially disposed with the pump housing in the first space; a bearing assembly disposed in the first space, comprising a bearing seat and a bearing, wherein the bearing is disposed in the bearing seat and around the shaft; a stator assembly disposed in the first space and fixed to the pump housing; a rotor assembly disposed in the first space and rotatable relative to the stator assembly about a rotation axis, the rotation axis being colinear with a central axis of the pump housing; Wherein, the bearing seat and the PCBA housing are formed integrally.

2. The electric oil pump according to claim 1, characterized in that The bearing seat is overmolded to the PCBA housing.

3. The electric oil pump according to claim 2, characterized in that: The pump housing has a bearing portion disposed around the shaft and adjacent to a first end of the pump housing.

4. The electric oil pump according to claim 1, characterized in that The PCBA housing and the PCBA cover together at least partially enclose a second space, and the PCBA board is disposed in the second space.

5. The electric oil pump according to claim 4, characterized in that: The PCBA housing completely encloses the second end of the pump housing.

6. The electric oil pump according to claim 5, characterized in that The PCBA assembly further includes a thermally conductive adhesive, two sides of which are respectively connected to the PCBA board and the PCBA cover.

7. The electric oil pump according to claim 4, characterized in that The first space is communicated with the second space.

8. The electric oil pump according to claim 7, characterized in that: The PCBA housing is provided with at least one through hole, and the first space and the second space are communicated with each other through the through hole.

9. The electric oil pump according to claim 1, characterized in that The PCBA assembly further includes a pin, one end of which is electrically connected to the PCBA board, and the other end of which extends from the PCBA housing.

10. The electric oil pump according to claim 1, characterized in that The stator assembly is a segmented stator, and the pump housing has a cylindrical shape.

11. The electric oil pump according to claim 1, characterized in that The pump cover is provided with an oil inlet and an oil outlet.

12. A vehicle, characterized in that: The invention comprises the electric oil pump according to any one of claims 1 to 10.

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