Electric pump

Abstract

An electric pump, having an electronic control assembly (8), a first chamber (20), a chamber inflow passage (40) and a chamber outflow passage (50). The chamber inflow passage (40) and the chamber outflow passage (50) are in communication with the first chamber (20). The electronic control assembly (8) comprises a temperature measurement unit (82) and a circuit board (81). The temperature measurement unit (82) is electrically connected to the circuit board (81). Among the projection of the chamber inflow passage (40) on a first surface (811) and the projection of the chamber outflow passage (50) on the first surface (811), the projection closer to a center shaft of the electric pump is a first projection (101'), and the projection farther away from the center shaft of the electric pump is a second projection (102'). The maximum distance from the center of the first projection (101') to the second projection (102') is a first distance. The temperature measurement unit (82) is located within a circular area with the center of the first projection (101') as the center and the first distance as the radius. The electric pump has the characteristic of accurately measuring the temperature of a working medium.

Description

[0001] The present application claims the priorities to Chinese Patent Application No. 202310942539.8, titled "ELECTRIC PUMP", filed with the China National Intellectual Property Administration on July 28, 2023, and Chinese Patent Application No. 202420902860.3, titled "ELECTRIC PUMP", filed with the China National Intellectual Property Administration on April 28, 2024, both of which are incorporated herein by reference in their entireties.FIELD

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

[0003] An electric pump is applied to a lubrication system and / or a cooling system of a vehicle, and may well meet market demands. When the electric pump is in operation, the working medium from the lubrication system and / or the cooling system flows into a motor chamber, where it may dissipate heat from elements in the motor chamber. However, if the working medium flowing into the motor chamber is at a relatively high temperature, certain components in the lubrication system and / or the cooling system may have a shortened service life.SUMMARY

[0004] The working medium from the lubrication system and / or the cooling system flows into the motor chamber. Due to heat generated by a stator assembly and an electronic control assembly arranged in the motor chamber, there is a temperature difference between the working medium in the motor chamber and the working medium within the lubrication system and / or the cooling system. If the temperature of the working medium in the lubrication system and / or the cooling system fails to be accurately detected, the working medium may be at a relatively high temperature, consequently shortening the service life of certain components in the lubrication system and / or the cooling system. An object of the present application is to provide an electric pump that facilitates accurate detection of the temperature of the working medium.

[0005] To achieve the above object, the following technical solution is provided according to the present application.

[0006] An electric pump includes an electronic control assembly and a stator assembly, which is electrically connected to the electronic control assembly. The electric pump has a first chamber. The electronic control assembly is arranged in the first chamber, and the stator assembly is also arranged in the first chamber. The electric pump is formed with a chamber inflow passage and a chamber outflow passage. Both the chamber inflow passage and the chamber outflow passage are in communication with the first chamber. The electronic control assembly includes a temperature detection unit and a circuit board. The temperature detection unit is electrically and fixedly connected to the circuit board. The circuit board has a first surface and a second surface. The stator assembly includes an upper end. The first surface is located closer to the upper end than the second surface in an axial direction of the electric pump. Orthographic projections of both the chamber inflow passage and the chamber outflow passage onto the first surface are defined as follows: the one relatively closer to a central axis of the electric pump is a first projection, and the other one relatively farther away from the central axis of the electric pump is a second projection. A maximum distance between a center of the first projection and the second projection is defined as a first distance. An orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the center of the first projection as a center and the first distance as a radius. Alternatively, a minimum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface is identical to that between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface. The greater of the following two distances is defined as a first distance: a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface, and a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface. An orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the central axis of the electric pump as a center and the first distance as a radius.

[0007] In the above technical solutions, the temperature detection unit is electrically connected to the circuit board, and the temperature detection unit is arranged within a circular area with the center of the first projection as the center and the first distance as the radius. Alternatively, the greater of the following two distances is defined as a first distance: a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface, and a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface, and an orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the central axis of the electric pump as a center and the first distance as a radius. The working medium in the first chamber flows from the chamber inflow passage to the chamber outflow passage. Since the temperature detection unit is arranged in a relatively short flow path of the working medium, where the working medium flows at a high flow rate, and the temperature of the working medium is less affected by the heat generated by the stator assembly and / or the electronic control assembly, thereby facilitating accurate detection of the temperature of the working medium.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 2 is a schematic view of a first housing in FIG. 1; FIG. 3 is a schematic sectional view of the first housing shown in FIG. 2; FIG. 4 is a schematic view of a pump shaft in FIG. 1; FIG. 5 is a schematic view of a pump cover in FIG. 1 from a first perspective; FIG. 6 is another schematic view of the pump cover in FIG. 1 from a second perspective; FIG. 7 is a schematic view of an electronic control assembly in FIG. 1; FIG. 8 is a schematic sectional view of the electronic control assembly shown in FIG. 1; FIG. 9 is a schematic view of projections of both a chamber inflow passage and a chamber outflow passage onto a first surface in FIG. 1; FIG. 10 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 11 is a schematic view of a first housing in FIG. 10; FIG. 12 is a schematic sectional view of the first housing shown in FIG. 11; FIG. 13 is a schematic view of a projection of a first rotor assembly in FIG. 10 onto a chamber wall; FIG. 14 is a schematic view of a combination of a stator assembly, a second rotor assembly and a pump shaft in FIG. 10; FIG. 15 is a schematic view of the pump shaft in FIG. 10; FIG. 16 is a schematic sectional view of a first embodiment of the pump shaft shown in FIG. 15; FIG. 17 is a schematic sectional view of a second embodiment of the pump shaft shown in FIG. 15; FIG. 18 is a schematic view of a pump cover in FIG. 10 from a first perspective; FIG. 19 is another schematic view of the pump cover in FIG. 10 from a second perspective; FIG. 20 is a schematic view of the first rotor assembly in FIG. 1 or FIG. 10; FIG. 21 is a schematic view of an electronic control assembly in FIG. 10; FIG. 22 is a schematic sectional view of the electronic control assembly shown in FIG. 10; FIG. 23 is a schematic view showing an embodiment of projections of a chamber inflow passage and a chamber outflow passage in FIG. 10 onto a first surface; FIG. 24 is a schematic view showing another embodiment of the projections of the chamber inflow passage and the chamber outflow passage in FIG. 10 onto the first surface; FIG. 25 is a schematic view of a second surface of a circuit board shown in FIG. 24; FIG. 26 is a schematic view showing another embodiment of the projections of the chamber inflow passage and the chamber outflow passage in FIG. 10 onto the first surface; FIG. 27 is a schematic view of a second surface of a circuit board shown in FIG. 26; FIG. 28 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 29 is a schematic view of projections of a chamber inflow passage and a chamber outflow passage in FIG. 28 onto a first surface; FIG. 30 is a schematic view showing a first embodiment of an electric pump according to the present application; FIG. 31 is an exploded schematic view of the electric pump shown in FIG. 30; FIG. 32 is a schematic sectional view taken along line B-B in FIG. 30; FIG. 33 is an enlarged schematic view of part C in FIG. 32; FIG. 34 is a schematic view showing a first embodiment of a rotating assembly shown in FIG. 32; FIG. 35 is a schematic sectional view taken along line D-D in FIG. 34 according to a first embodiment; FIG. 36 is a schematic sectional view taken along line D-D in FIG. 34 according to a second embodiment; FIG. 37 is a schematic view showing a second embodiment of the rotating assembly shown in FIG. 32; FIG. 38 is a schematic sectional view of the rotating assembly in FIG. 37; FIG. 39 is a schematic view showing a second embodiment of an electric pump according to the present application; FIG. 40 is an enlarged schematic view of part E in FIG. 39; FIG. 41 is a schematic view showing a third embodiment of an electric pump according to the present application; and FIG. 42 is an enlarged schematic view of part X in FIG. 41.

[0009] List of reference numerals:1.pump cover;11.first inflow passage;12.outflow passage;13.second inflow passage;14.branch passage;141.first communication portion;142.second communication portion;2.first housing;21.chamber wall;211.upper end face;212.lower end face;3.second housing;4.first rotor assembly / pump rotor;41.first rotor;42.second rotor;43.hydraulic chamber;431.first hydraulic chamber;432.second hydraulic chamber;5.stator assembly;51.stator core;52.winding;53.upper end;6.second rotor assembly / motor rotor;7.pump shaft;71.first end;72.first end face;73.second end face;70.rotating assembly;701.first end;702.second end;703.flow passage opening;74.receiving groove;741.groove wall;7411.first side wall;7412.second side wall;75.detection member;8.electronic control assembly;81.circuit board;811.first surface / front surface;812.second surface / rear surface;813.flow guide hole;82.temperature detection unit;821.body part;822.temperature sensing part;823.conductive part;83.sensor;9.connecting part;91.accommodating groove;92.through-hole;921.first opening;922.second opening;95.receiving hole;20.first chamber;30.second chamber;40.chamber inflow passage;401.main flow passage;402.branch passage;50.chamber outflow passage;101'.first projection;102'.second projection. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present application will be further explained below with reference to the accompanying drawings and specific embodiments.

[0011] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings used in the following description show only some of the embodiments of the present application. Based on these technical solutions, those skilled in the art can obtain other technical solutions without creative effort. The orientation terms such as "upper" and "lower" mentioned herein are defined based on the relative positions of the components shown in the accompanying drawings, only for the purpose of clearly and conveniently expressing the technical solutions. It should be understood that the orientation terms used herein shall not limit the protection scope claimed in the present application.

[0012] An electric pump may be applied in a lubrication system and / or a cooling system of a vehicle to provide circulating power for a working medium in the lubrication system and / or the cooling system of the vehicle. The lubrication system and / or the cooling system of the vehicle may provide lubricating oil and / or cooling oil for a transmission system. In the present application, the expression "A is fixedly connected to B" means that no relative displacement will occur between A and B after connection, for example, A and B are welded and fixed together. The expression "A is position-limitedly connected to B" means that a movement of B is limited by A in a certain direction, or vice versa, a movement of A is limited by B in a certain direction.

[0013] Referring to FIGS. 1 to 32, 39 and 41, an electric pump includes a pump housing, which includes a pump cover 1, a first housing 2 and a second housing 3. The pump cover 1 is fixedly connected to the first housing 2, for example, the pump cover 1 is connected to the first housing 2 by screws or bolts. Certainly, the pump cover 1 may also be connected to the first housing 2 by other connection manners, such as plug-in connection or snap-fit connection. The first housing 2 is fixedly connected to the second housing 3, for example, the first housing 2 is connected to the second housing 3 by screws or bolts, facilitating the assembly and disassembly of the electric pump.

[0014] The electric pump includes a first rotor assembly (or a pump rotor) 4, a stator assembly 5, a second rotor assembly (or a motor rotor) 6, a rotating assembly 7 and an electronic control assembly 8. The stator assembly 5 is arranged around an outer periphery of the second rotor assembly 6. The stator assembly 5 is configured to surround the second rotor assembly 6 from a radial outer side of the second rotor assembly 6. The electric pump has a first chamber 20 and a second chamber 30. The first chamber 20 is in communication with the second chamber 30. The first rotor assembly 4 (or at least a portion of the first rotor assembly 4) is arranged in the second chamber 30. The electronic control assembly 8, the second rotor assembly 6 (or at least a portion of the second rotor assembly 6), at least a portion of the rotating assembly 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are arranged in the first chamber 20. The electronic control assembly 8 and the stator assembly 5 are arranged in the same chamber, enabling a reduction in an axial dimension of the electric pump and a compact structure, thereby reducing the production costs of the electric pump.

[0015] The first rotor assembly 4 includes a first rotor 41 and a second rotor 42. The first rotor 41 includes several internal teeth, and the second rotor 42 includes several external teeth. The electric pump has a hydraulic chamber 43, which is located between the first rotor 41 and the second rotor 42. The stator assembly 5 is electrically connected to the electronic control assembly 8. The stator assembly 5 includes a stator core 51 and a winding 52. When the electric pump is in operation, the electronic control assembly 8 is configured to control a current in the winding 52 of the stator assembly 5 to vary according to a predetermined pattern, thereby enabling the stator assembly 5 to generate a varying excitation magnetic field. The second rotor assembly 6 rotates under an influence of this excitation magnetic field, and is configured to directly or indirectly drive the first rotor assembly 4 to rotate. In this embodiment, the rotating assembly 70 includes a pump shaft 7, which is in transmission connection with both the first rotor assembly 4 and the second rotor assembly 6. Specifically, one side of the pump shaft 7 is connected to the second rotor 42, whereas the other side of the pump shaft 7 is connected to the second rotor assembly 6. The second rotor assembly 6 is configured to drive the second rotor 42 to rotate via the pump shaft 7, thereby achieving the rotation of the first rotor assembly 4.

[0016] The first rotor 41 is arranged around an outer periphery of the second rotor 42 and is internally meshed with the second rotor 42. In other embodiments, the first rotor 41 and the second rotor 42 may be externally meshed with each other, in which case the first rotor 41 and the second rotor 42 may be arranged side by side. In this embodiment, a central axis of the first rotor 41 is offset from that of the second rotor 42, meaning that there is a certain eccentricity between the central axes of both the first rotor 41 and the second rotor 42. When the second rotor 42 rotates, at least some of the external teeth of the second rotor 42 are meshed with at least some of the internal teeth of the first rotor 41, thereby enabling the second rotor 42 to drive the first rotor 41 to rotate.

[0017] The electric pump includes a first inflow passage 11 and an outflow passage 12. The first inflow passage 11 is used for inflow of the working medium, and the outflow passage 12 is used for outflow of the working medium. Specifically, the working medium may enter the hydraulic chamber 43 through the first inflow passage 11, and exit the hydraulic chamber 43 through the outflow passage 12. During one complete rotation of the first rotor assembly 4, a volume of the hydraulic chamber 43 between at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 will change. Specifically, during the rotation of the first rotor assembly 4 from its starting position to a certain angle, the volume of the hydraulic chamber 43 formed between the at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 gradually increases, creating a partial vacuum. At this point, the working medium is drawn into the hydraulic chamber 43 from the first inflow passage 11. During the continuous rotation of the first rotor 41 and the second rotor 42, the volume of the hydraulic chamber 43 formed between the at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 gradually decreases to compress the working medium. Thus, the working medium is expelled from the hydraulic chamber 43 into the outflow passage 12, generating a motive force for flow. A flow path of the working medium described above is denoted as S1 in FIG. 1 or 10.

[0018] The hydraulic chamber 43 includes a first hydraulic chamber 431 and a second hydraulic chamber 432. To more clearly distinguish the first hydraulic chambers 431 and the second hydraulic chamber 432, reference is made to FIG. 13, where two different types of hatching patterns are used to distinguish them. In this embodiment, referring to FIG. 10, the first rotor assembly 4 rotates in a counterclockwise direction. The term "counterclockwise" used herein is defined from a top-view perspective when the un-sectioned electric pump is oriented as shown in FIG. 10. The first hydraulic chamber 431 includes several first hydraulic sub-chambers, and the second hydraulic chamber 432 includes several second hydraulic sub-chambers. Along a rotation direction of the first rotor assembly 4, the volume of the first hydraulic sub-chamber gradually increases, thereby creating a partial vacuum. At this point, the working medium is drawn into the first hydraulic sub-chamber. In the second hydraulic chamber 432, along the rotation direction of the first rotor assembly 4, the volume of the second hydraulic sub-chamber gradually decreases to compress the working medium, which is then expelled out of the second hydraulic sub-chamber, generating the motive force for flow.

[0019] Referring to FIGS. 1 to 29, the electric pump has a chamber inflow passage 40 and a chamber outflow passage 50. The chamber inflow passage 40 is in communication with the first chamber 20, and the chamber outflow passage 50 is in communication with the first chamber 20. The electronic control assembly 8 includes a circuit board 81 and a temperature detection unit 82. The temperature detection unit 82 is electrically connected to the circuit board 81, and the temperature detection unit 82 is fixedly connected to the circuit board 81. The temperature detection unit 82 is at least partially arranged on the circuit board 81. The temperature detection unit 82 is directly integrated with the electronic control assembly 8. In this way, it is unnecessary to mechanically connect the temperature detection unit 82 to an external system separately, thereby facilitating a relative reduction in mechanical connections of the system and consequently a simplification of system structure and resulting in a more compact system structure. Furthermore, the working medium may enter the first chamber 20 through the chamber inflow passage 40, which enables the working medium in the first chamber 20 to exchange heat with the electronic control assembly 8, thereby facilitating heat dissipation of the electronic control assembly 8 and thus prolonging the service life of the electric pump. Further, at least a portion of the stator assembly 5 may come into contact with the working medium in the first chamber 20, which enables the working medium in the first chamber 20 to exchange heat with the stator assembly 5, thereby facilitating heat dissipation of the stator assembly 5.

[0020] The circuit board 81 has a first surface 811 and a second surface 812. The stator assembly 5 includes an upper end 53. The first surface 811 is located closer to the upper end 53 than the second surface 812 in an axial direction of the electric pump. Orthographic projections of both the chamber inflow passage 40 and the chamber outflow passage 50 onto the first surface 811 are defined as follows: the one relatively closer to the central axis L of the electric pump is a first projection 101', and the other one relatively farther away from the central axis L of the electric pump is a second projection 102'. A maximum distance between a center O' of the first projection 101' and the second projection 102' is defined as a first distance L1. The temperature detection unit 82 is arranged within a circular area Q with the center O' of the first projection 101' as a center and the first distance L1 as a radius. In one embodiment, referring to FIGS. 28 to 29, a minimum distance between the central axis L of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is identical to that between the central axis L of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. The greater of the following two distances is defined as a first distance: a maximum distance between the central axis L of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811, and a maximum distance between the central axis L of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. An orthographic projection of the temperature detection unit 82 onto the first surface 811 is located within a circular area with the central axis L of the electric pump as a center and the first distance as a radius. In the present application, the central axis L of the electric pump is coincident with a central axis M of the pump shaft. The working medium at an inlet of the chamber inflow passage 40 has a higher pressure than that at an outlet of the chamber outflow passage 50, which results in a pressure difference between the inlet of the chamber inflow passage 40 and the outlet of the chamber outflow passage 50. In accordance with the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the first chamber 20 may flow towards the outlet of the chamber outflow passage 50, meaning that the working medium in the first chamber 20 may flow out of the first chamber 20 through the chamber outflow passage 50. The working medium in the first chamber 20 flows from the chamber inflow passage 40 to the chamber outflow passage 50. Since the temperature detection unit 82 is arranged in a relatively short flow path of the working medium, where the working medium flows at a high flow rate, and the temperature of the working medium is less affected by the heat generated by the stator assembly 5 and / or the electronic control assembly 8, thereby facilitating accurate detection of the temperature of the working medium.

[0021] The temperature detection unit 82 includes a fixing part (not shown), which is electrically connected to its body part 821 and the circuit board 81. In one embodiment, referring to FIGS. 1 to 9, the temperature detection unit 82 includes a body part 821. In a direction parallel to the axial direction of the electric pump, the body part 821 is located closer to the first surface 811 relative to the second surface 812, or the body part 821 is located farther away from the second surface 812 relative to the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is closer to the central axis of the electric pump than the orthographic projection of the chamber inflow passage 40 onto the first surface 811. That is to say, in a radial direction of the electric pump, a minimum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811 is less than that between the central axis of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the first projection 101', and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the second projection 102'. A minimum distance between the temperature detection unit 82 and the second projection 102' is less than that between the temperature detection unit 82 and the first projection 101'. Further, the temperature detection unit 82 is at least partially arranged in the second projection 102', in which case the minimum distance between the temperature detection unit 82 and the second projection 102' is zero. A flow path of the working medium from the chamber inflow passage 40 to the temperature detection unit 82 or a flow path of the working medium from the temperature detection unit 82 to the chamber outflow passage 50 may be straight, so that the working medium flows with low resistance and at a high flow rate. Consequently, the temperature detection unit 82 may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium. Furthermore, the temperature detection unit 82 is located relatively closer to the chamber inflow passage 40, enabling rapid detection of the temperature of the working medium. The temperature detection unit 82 includes the fixing part (not shown in the figure), which is electrically connected to the body part 821 and the circuit board 81.

[0022] The electric pump includes a pump shaft 7, which is at least partially arranged in the first chamber 20. The chamber outflow passage 50 extends through the first end face 72 and the second end face 73 of the pump shaft 7. The pump shaft 7 is formed with an opening in the first end face 72, and an orthographic projection of the opening of the pump shaft 7 onto the first surface 811 is the first projection 101'. The electric pump includes the pump cover 1. The first inflow passage 11 extends through an upper end face and a lower end face of the pump cover 1. The first inflow passage 11 is in communication with the second chamber 30. The electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively located on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber inflow passage 40 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber inflow passage 40 has an opening in the lower end face 212, and an orthographic projection of the opening of the chamber inflow passage 40 onto the first surface 811 is the second projection 102'. The chamber inflow passage 40 is in communication with the second chamber 30. Specifically, the second hydraulic chamber 432 is in communication with the chamber inflow passage 40, and the working medium entering the electric pump may flow from the first inflow passage 11 to the chamber inflow passage 40.

[0023] The pump cover 1 includes a branch passage 14, which is recessed from the lower end face of the pump cover 1. In the axial direction of the pump cover 1, the branch passage 14 does not extend through the upper end face of the pump cover 1. As shown in a fluid path S2 in FIG. 1, the branch passage 14 is in communication with both the chamber outflow passage 50 and the first inflow passage 11, so that the working medium in the first chamber 20 may flow through the chamber outflow passage 50 and the branch passage 14 into the first inflow passage 11, and then be discharged from the outflow passage 12. Such discharge of the working medium from the first chamber 20 into the first inflow passage 11 facilitates an increase in an inlet flow of the pump, thereby enhancing the pump efficiency. Furthermore, since the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8) is arranged in the first chamber 20, the flowing working medium may carry away at least a portion of the heat generated by the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8), thereby enhancing the heat dissipation efficiency of the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8), and consequently meeting heat dissipation requirements for the high-power electric pump. The branch passage 14 includes a first communication portion 141 and a second communication portion 142. The first communication portion 141 is in direct communication with the chamber outflow passage 50. In the radial direction of the pump cover 1, the second communication portion 142 is formed as a portion of a peripheral side wall of the first communication portion 141, enabling communication between the first communication portion 141 and the first inflow passage 11.

[0024] In one embodiment, referring to FIGS. 10 to 27, the orthographic projection of the chamber outflow passage 50 onto the first surface 811 is farther away from the central axis of the electric pump than the orthographic projection of the chamber inflow passage 40 onto the first surface 811. That is to say, in the radial direction of the electric pump, the minimum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is less than that between the central axis of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the second projection 102', and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the first projection 101'. The minimum distance between the temperature detection unit 82 and the first projection 101' is less than that between the temperature detection unit 82 and the second projection 102'. Further, the temperature detection unit 82 is at least partially arranged within the first projection 101', meaning that the minimum distance between the temperature detection unit 82 and the first projection 101' is zero. The flow path of the working medium from the chamber inflow passage 40 to the temperature detection unit 82 or the flow path of the working medium from the temperature detection unit 82 to the chamber outflow passage 50 may be straight, so that the working medium flows with low resistance and at a high flow rate. Consequently, the temperature detection unit 82 may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium; Furthermore, the temperature detection unit 82 is located relatively closer to the chamber inflow passage 40, enabling rapid detection of the temperature of the working medium.

[0025] The electric pump includes a pump shaft 7, which is at least partially arranged in the first chamber 20. The pump shaft 7 has a first end 71 with a first end face 72. In the direction parallel to the axial direction of the electric pump, the first end 71 is located closer to the circuit board 81 than the second rotor assembly 6. The chamber inflow passage 40 is formed in the pump shaft 7, and the chamber inflow passage 40 has an opening in a second end face 73. The chamber inflow passage 40 includes a main flow passage 401 and a branch passage 402. The main flow passage 401 is in communication with the branch passage 402. The branch passage 402 has at least one opening in a side wall of the first end 71. The working medium enters the first chamber 20 through the chamber inflow passage 40 of the pump shaft 7. After following out from the chamber inflow passage 40, the working medium comes into contact with the electronic control assembly 8 prior to reaching the stator assembly 5 and / or the second rotor assembly 6. At this point, the working medium has absorbed minimal heat (or none at all). The temperature of the working medium in the second inflow passage 13 may be accurately obtained by measurement of the temperature detection unit 82. Base on the detected temperature of the working medium, the temperature of the working medium at the stator assembly 5 and the second rotor assembly 6 may be estimated for precise torque distribution. Furthermore, no sensor is needed to be arranged at the inlet of the chamber inflow passage 40, thereby facilitating a reduction in communication channels for relaying information to the electronic control assembly 8 and cost reduction.

[0026] In one embodiment, referring to FIGS. 16 and 17, an extension direction of the branch passage 402 is angled with respect to the central axis of the electric pump. In the case that the chamber inflow passage 40 includes multiple branch passages 402, an extension direction of at least one of the branch passages 402 is angled with respect to the central axis of the electric pump. Referring to FIG. 16, the branch passage 402 is arranged perpendicular to the central axis of the electric pump, meaning that the extension direction of the branch passage 402 is perpendicular to the central axis of the electric pump. The working medium flows within the branch passage 402 in the extension direction of the branch passage 402. When the electric pump is in operation, the pump shaft 7 rotates, and the working medium exiting the branch passage 402 may have a relatively large contact area with the components (such as the stator assembly 5 and the electronic control assembly 8) in the first chamber 20, enhancing the heat dissipation effect of the working medium on these components. In an embodiment, referring to FIG. 17, the branch passage 402 is arranged to be inclined with respect to the central axis of the electric pump. The extension direction of the branch passage 402 intersects with that of the first surface 811, and the extension direction of the first surface 811 is perpendicular to the central axis of the electric pump. The inclined branch passage 402 enables the working medium to flow towards the circuit board 81, facilitating rapid contact between the working medium and the circuit board 81. Further, the extension direction of the branch passage 402 intersects with that of the temperature detection unit 82, and the extension direction of the temperature detection unit 82 is perpendicular to the central axis of the electric pump, facilitating rapid contact between the working medium and the temperature detection unit 82.

[0027] The electric pump includes a second inflow passage 13, which extends through the upper end face and the lower end face of the pump cover 1. The second inflow passage 13 is in communication with the chamber inflow passage 40, allowing the working medium to directly enter the chamber inflow passage 40 from the second inflow passage 13. The working medium exiting the chamber inflow passage 40 has not absorbed any heat. In this case, the temperature of the working medium in the chamber inflow passage 40 may represent the temperature of the working medium in a gearbox. By measuring the temperature of the working medium exiting the chamber inflow passage 40, the temperature of the working medium in the gearbox may be estimated, facilitating comprehensive thermal management of an electric drive system. Furthermore, there is no need to arrange additional temperature detection unit inside the gearbox, thereby facilitating cost reduction. The electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively arranged on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber outflow passage 50 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber outflow passage 50 has an opening in the lower end face 212, and an orthographic projection of the opening of the chamber outflow passage 50 onto the first surface 811 is the second projection 102'. The chamber outflow passage 50 is in communication with both the first chamber 20 and the first hydraulic chamber 431.

[0028] Referring to FIGS. 28 and 29, the electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively arranged on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber outflow passage 50 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber inflow passage 40 has a first opening in the lower end face 212. An orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the orthographic projection 101' of the first opening onto the first surface 811. The chamber outflow passage 50 has a second opening in the lower end face 212. An orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the orthographic projection 102' of the second opening onto the first surface 811. The chamber inflow passage 40 is in communication with both the first chamber 20 and the second hydraulic chamber. The chamber outflow passage 50 is in communication with both the first chamber 20 and the first hydraulic chamber.

[0029] Referring to FIGS. 1 to 27, the temperature detection unit 82 includes a body part 821, which is located closer to the second surface 812 relative to the first surface 811 in the direction parallel to the axial direction of the electric pump. The circuit board 81 is formed with a flow guide hole 813 that extends through both the first surface 811 and the second surface 812. The temperature detection unit 82 is spaced apart from the flow guide hole 813. Since the temperature detection unit 82 is in the flow path of the working medium, it may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium. The flow guide hole 813 is spaced apart from the first projection 101' and / or the second projection 102'. A minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than or equal to a minimum distance L3 between the first projection 101' and the flow guide hole 813. Alternatively, a minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than or equal to a minimum distance between the second projection 102' and the flow guide hole 813. The flow guide hole 813 enhances the circulation of the working medium on the second surface 812, with faster circulation of the working medium near the flow guide hole 813. The temperature detection unit 82 is located relatively closer to the flow guide hole 813, which facilitates enhancing the detection accuracy. Furthermore, the flow guide hole 813 enhances the circulation of the working medium on the second surface 812, thereby facilitating the heat dissipation of the electronic control assembly 8.

[0030] In other embodiments, the circuit board 81 is formed with multiple flow guide holes 813. The minimum distance L2 between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to the minimum distance L3 between the first projection 101' and the flow guide holes 813. The term "minimum distance" here refers to a minimum distance between the flow guide hole 813 closest to the first projection 101' and the first projection 101'. For example, the circuit board 81 is formed with a first flow guide hole and a second flow guide hole. In the case that a minimum distance (indicated by D1) between the first flow guide hole and the first projection 101' is greater than a minimum distance (indicated by D2) between the second flow guide hole and the first projection 101', and D2 is taken as the aforementioned L3. The distance L2 between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to D2.

[0031] In other embodiments, the circuit board 81 is formed with multiple flow guide holes 813. The distance between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to the minimum distance between the second projection 102' and the flow guide holes 813. The term "minimum distance" here refers to a minimum distance between the flow guide hole closest to the second projection 102' and the second projection 102'. For example, the circuit board 81 is formed with a third flow guide hole and a fourth flow guide hole. In the case that a minimum distance (indicated by D3) between the third flow guide hole and the second projection 102' is greater than a minimum distance (indicated by D4) between the fourth flow guide hole and the second projection 102', the distance between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to D4.

[0032] Referring to FIGS. 26 and 27, the flow guide hole 813 is located within the first projection 101' or the second projection 102'. The minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than a maximum distance L4 between the first projection 101' and the second projection 102'. In a direction parallel to the axial direction of the electric pump, the flow guide hole 813 is aligned with either the chamber inflow passage 40 or the chamber outflow passage 50. The working medium circulates more rapidly at the flow guide hole 813. The temperature detection unit 82 is located relatively closer to the flow guide hole 813, thereby facilitating enhancing the detection accuracy.

[0033] Referring to FIGS. 30 to 32, 39, and 41, the electric pump includes a detection member 75 and a sensor 83. The sensor 83 is electrically connected to the circuit board 81. The detection member 75 is arranged in correspondence with the sensor 83 to detect a phase of the second rotor assembly 6. The electric pump includes a first inflow passage 11, a second inflow passage 13, and an outflow passage 12. The first inflow passage 11 and the second inflow passage 13 allow inflow of a working medium, while the outflow passage 12 allows outflow of the working medium. The electric pump includes a chamber inflow passage 40 and a chamber outflow passage 50. The second inflow passage 13 is communication with the chamber inflow passage 40. Each of the chamber inflow passage 40 and the chamber outflow passage 50 is in communication with the first chamber 20. The working medium may enter the first chamber 20 through the chamber inflow passage 40, enabling the working medium in the first chamber 20 to exchange heat with the electronic control assembly 8, thereby facilitating the heat dissipation of the electronic control assembly 8 and consequently prolonging the service life of the electric pump. Further, the stator assembly 5 may be at least partially in contact with the working medium located in the first chamber 20, enabling the working medium in the first chamber 20 to exchange heat with the stator assembly 5, facilitating the heat dissipation of the stator assembly 5. The working medium has a higher pressure at an inlet of the chamber inflow passage 40 than that at an outlet of the chamber outflow passage 50, which results in a pressure difference of the working medium created between the inlet of the chamber inflow passage 40 and the outlet of the chamber outflow passage 50. In accordance with the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the first chamber 20 may flow towards the outlet of the chamber outflow passage 50, meaning that the working medium in the first chamber 20 may exit the first chamber 20 through the chamber outflow passage 50.

[0034] Referring to FIGS. 30 to 42, the electronic control assembly 8 includes a circuit board 81 and a temperature detection unit 82. The temperature detection unit 82 is electrically connected to the circuit board 81, and includes a temperature sensing part 822. The rotating assembly 70 has a first end 701. The chamber inflow passage 40 has a flow passage opening 703 in an end face of the first end 701, and the temperature sensing part 822 is at least partially arranged in the chamber inflow passage 40. Alternatively, the chamber inflow passage 40 has a flow passage opening 703 in a side wall of the first end 701, and the temperature sensing part 822 is configured to be at least partially aligned with the flow passage opening 703 in the radial direction of the electric pump. When the electric pump is in operation, the working medium in the lubrication system and / or the cooling system may flow through the flow passage opening 703 into the first chamber 20. The temperature detection unit 82 may be arranged close to the flow passage opening 703, and thus it may promptly detect the temperature of the working medium in the lubrication system and / or the cooling system, thereby facilitating the accurate detection of the temperature of the working medium in the lubrication system and / or the cooling system. The circuit board 81 includes a front surface 811. In a direction parallel to the axial direction of the electric pump, the temperature detection unit 82 extends from the front surface 811 by a length h1 that is greater than a minimum distance h2 between the front surface 811 and the flow passage opening 703 and less than or equal to a maximum distance h3 between the front surface 811 and the flow passage opening 703. The temperature detection unit 82 may promptly detect the temperature of the working medium exiting the flow passage opening 703.

[0035] In one embodiment, referring to FIGS. 39 and 40, the rotating assembly 70 includes a pump shaft 7. The motor rotor 6 is fixedly or position-limitedly connected to the pump shaft 7. The chamber inflow passage 40 extends through a first end face 72 and a second end face 73 of the pump shaft 7. The first end 701 has the first end face 72. The flow passage opening 703 of the chamber inflow passage 40 is formed in the first end face 72, and the temperature sensing part 822 is at least partially arranged in the chamber inflow passage 40. When the electric pump is in operation, the working medium may directly enter the first chamber 20 from the chamber inflow passage 40. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, there may be a relatively large contact area between the temperature sensing part 822 and the working medium in the chamber inflow passage 40, thereby enhancing the detection accuracy of the temperature detection unit 82.

[0036] In one embodiment, referring to FIGS. 30 to 37, the rotating assembly 70 has a second end 702. The second end 702 is farther away from the circuit board 81 than the first end 701 in the axial direction of the electric pump. The rotating assembly 70 includes a pump shaft 7. The rotating assembly 70 is formed with a receiving groove 74. The receiving groove 74 is recessed from the first end 701 towards the second end 702. The chamber inflow passage 40 has at least one flow passage opening 703 in a groove wall 741 of the receiving groove 74. The temperature sensing part 822 is at least partially arranged in the receiving groove 74. The working medium flows into the receiving groove 74 through the flow passage opening 703. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, there may be a relatively large contact area between the temperature sensing part 822 and the working medium in the receiving groove 74, which facilitates enhancing the detection accuracy of the temperature detection unit 82. In some embodiments, referring to FIGS. 35 and 36, the pump shaft 7 is formed with a receiving groove 74. Alternatively, the rotating assembly 70 includes a pump shaft 7 and a connecting part 9, which is fixedly or position-limitedly connected to the pump shaft 7 and formed with a receiving groove 74, thereby simplifying the manufacturing process for the rotating assembly 70.

[0037] The groove wall 741 includes a first side wall 7411 and a second side wall 7412. In the radial direction of the electric pump, the first side wall 7411 is located closer to the central axis of the electric pump than the second side wall 7412. The at least one flow passage opening 703 of the chamber inflow passage 40 is formed in the first side wall 7411 of the receiving groove 74. The temperature detection unit 82 may be at least partially arranged between the flow passage opening 703 and the second side wall 7412 in the radial direction of the electric pump. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. Further, in the radial direction of the electric pump, the temperature sensing part 822 is arranged between the flow passage opening 703 and the second side wall 7412, and the temperature detection unit 82 may promptly detect the temperature of the working medium after the working medium flows out of the flow passage opening 703, thereby facilitating the accurate detection of the temperature of the working medium. The first end 701 has a greater width than the second end 702 in the radial direction of the electric pump, enabling the first side wall 7411 to be radially spaced apart from the second side wall 7412. In this way, the receiving groove 74 may provide a relatively large space for receiving the temperature detection unit 82, thereby facilitating a reduction in assembly precision required for the temperature detection unit 82 and consequently enhancing assembly efficiency of the electric pump.

[0038] In one embodiment, referring to FIGS. 37 and 38, the rotating assembly 70 includes a pump shaft 7 and a connecting part 9. The pump shaft 7 is integrated with the connecting part 9, which is formed by injection molding using the pump shaft 7 as an insert. Alternatively, the pump shaft 7 is separated from the connecting part 9, which is formed by injection molding and is fixedly or position-limitedly connected to the pump shaft 7, thereby simplifying the manufacturing process. The connecting part 9 is fixedly or position-limitedly connected to the pump shaft 7. A side wall of the first end 701 includes an outer side wall of the pump shaft 7. The flow passage opening 703 of the chamber inflow passage 40 is formed in the outer side wall of the pump shaft 7. The connecting part 9 is formed with an accommodating groove 91 and a through-hole 92. The accommodating groove 91 is in communication with the through-hole 92, which is in communication with both the flow passage opening 703 and the first chamber 20. The temperature sensing part 822 is at least partially arranged in the through-hole 92. The working medium in the chamber inflow passage 40 flows into the first chamber 20 through the through-hole 92. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium.

[0039] Referring to FIGS. 37 and 38, a hole wall of the through-hole 92 includes a portion of a groove wall of the accommodating groove 91. The through-hole 92 has a first opening 921 in an inner side wall of the connecting part 9, and the first opening 921 is in communication with the flow passage opening 703. The through-hole 92 further has a second opening 922 in an outer side wall of the connecting part 9, and the second opening 922 is in communication with the first chamber 20. The working medium may enter the first chamber 20 through the second opening 922. The working medium in the first chamber 20 may exchange heat with the electronic control assembly 8, thereby facilitating the heat dissipation of the electronic control assembly 8 and consequently prolonging the service life of the electric pump. The temperature detection unit 82 includes a temperature sensing part 822 and a conductive part 823. The conductive part 823 is electrically connected to both the circuit board 81 and the temperature sensing part 822. The conductive part 823 generally has a relatively small radial cross-sectional area and low resistance to a radial impact. The conductive part 823 is at least partially arranged in the accommodating groove 91, which helps reduce the impact from the working medium on the conductive part 823, thereby improving the reliability of connection between the temperature detection unit 82 and the circuit board 81. The connecting part 9 is formed with a receiving hole 95. The pump shaft 7 is at least partially arranged in the receiving hole 95. A side wall defining the receiving hole 95 is fixedly or position-limitedly connected to at least a portion of the outer side wall of the pump shaft 7. The temperature detection unit 82 may be arranged close to the flow passage opening 703. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, the detection member 75 may be fixedly or position-limitedly connected to the connecting part 9. The detection member may be arranged close to the sensor 83 by virtue of the connecting part 9, thereby enhancing accuracy of the sensor 83 in sensing the detection member 75. Furthermore, the pump shaft 7 is generally made of a magnetic conductive material, and the connecting part 9 is made of for example a plastic material. The pump shaft 7 is separated from the detection member 75 by the connecting part 9, thereby reducing the influence of the pump shaft 7 on magnetic induction lines of the detection member 75 and consequently enhancing the accuracy of the sensor 83 in sensing magnetism.

[0040] It should be noted that the above embodiments are only intended to illustrate the present application rather than to limit the technical solutions described in the present application. Although the present specification has been described in detail with reference to the embodiments as described above, it should be understood by those skilled in the art that modifications or equivalent substitutions may still be made by those skilled in the art to the technical solutions of the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application shall fall within the scope claimed by the claims of the present application.

Examples

Embodiment Construction

[0010]The present application will be further explained below with reference to the accompanying drawings and specific embodiments.

[0011]In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings used in the following description show only some of the embodiments of the present application. Based on these technical solutions, those skilled in the art can obtain other technical solutions without creative effort. The orientation terms such as "upper" and "lower" mentioned herein are defined based on the relative positions of the components shown in the accompanying drawings, only for the purpose of clearly and conveniently expressing the technical solutions. It should be understood that the orientation terms used herein shall not limit the protection scope c...

[0001] The present application claims the priorities to Chinese Patent Application No. 202310942539.8, titled "ELECTRIC PUMP", filed with the China National Intellectual Property Administration on July 28, 2023, and Chinese Patent Application No. 202420902860.3, titled "ELECTRIC PUMP", filed with the China National Intellectual Property Administration on April 28, 2024, both of which are incorporated herein by reference in their entireties.FIELD

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

[0003] An electric pump is applied to a lubrication system and / or a cooling system of a vehicle, and may well meet market demands. When the electric pump is in operation, the working medium from the lubrication system and / or the cooling system flows into a motor chamber, where it may dissipate heat from elements in the motor chamber. However, if the working medium flowing into the motor chamber is at a relatively high temperature, certain components in the lubrication system and / or the cooling system may have a shortened service life.SUMMARY

[0004] The working medium from the lubrication system and / or the cooling system flows into the motor chamber. Due to heat generated by a stator assembly and an electronic control assembly arranged in the motor chamber, there is a temperature difference between the working medium in the motor chamber and the working medium within the lubrication system and / or the cooling system. If the temperature of the working medium in the lubrication system and / or the cooling system fails to be accurately detected, the working medium may be at a relatively high temperature, consequently shortening the service life of certain components in the lubrication system and / or the cooling system. An object of the present application is to provide an electric pump that facilitates accurate detection of the temperature of the working medium.

[0005] To achieve the above object, the following technical solution is provided according to the present application.

[0006] An electric pump includes an electronic control assembly and a stator assembly, which is electrically connected to the electronic control assembly. The electric pump has a first chamber. The electronic control assembly is arranged in the first chamber, and the stator assembly is also arranged in the first chamber. The electric pump is formed with a chamber inflow passage and a chamber outflow passage. Both the chamber inflow passage and the chamber outflow passage are in communication with the first chamber. The electronic control assembly includes a temperature detection unit and a circuit board. The temperature detection unit is electrically and fixedly connected to the circuit board. The circuit board has a first surface and a second surface. The stator assembly includes an upper end. The first surface is located closer to the upper end than the second surface in an axial direction of the electric pump. Orthographic projections of both the chamber inflow passage and the chamber outflow passage onto the first surface are defined as follows: the one relatively closer to a central axis of the electric pump is a first projection, and the other one relatively farther away from the central axis of the electric pump is a second projection. A maximum distance between a center of the first projection and the second projection is defined as a first distance. An orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the center of the first projection as a center and the first distance as a radius. Alternatively, a minimum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface is identical to that between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface. The greater of the following two distances is defined as a first distance: a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface, and a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface. An orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the central axis of the electric pump as a center and the first distance as a radius.

[0007] In the above technical solutions, the temperature detection unit is electrically connected to the circuit board, and the temperature detection unit is arranged within a circular area with the center of the first projection as the center and the first distance as the radius. Alternatively, the greater of the following two distances is defined as a first distance: a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage onto the first surface, and a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage onto the first surface, and an orthographic projection of the temperature detection unit onto the first surface is located within a circular area with the central axis of the electric pump as a center and the first distance as a radius. The working medium in the first chamber flows from the chamber inflow passage to the chamber outflow passage. Since the temperature detection unit is arranged in a relatively short flow path of the working medium, where the working medium flows at a high flow rate, and the temperature of the working medium is less affected by the heat generated by the stator assembly and / or the electronic control assembly, thereby facilitating accurate detection of the temperature of the working medium.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 2 is a schematic view of a first housing in FIG. 1; FIG. 3 is a schematic sectional view of the first housing shown in FIG. 2; FIG. 4 is a schematic view of a pump shaft in FIG. 1; FIG. 5 is a schematic view of a pump cover in FIG. 1 from a first perspective; FIG. 6 is another schematic view of the pump cover in FIG. 1 from a second perspective; FIG. 7 is a schematic view of an electronic control assembly in FIG. 1; FIG. 8 is a schematic sectional view of the electronic control assembly shown in FIG. 1; FIG. 9 is a schematic view of projections of both a chamber inflow passage and a chamber outflow passage onto a first surface in FIG. 1; FIG. 10 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 11 is a schematic view of a first housing in FIG. 10; FIG. 12 is a schematic sectional view of the first housing shown in FIG. 11; FIG. 13 is a schematic view of a projection of a first rotor assembly in FIG. 10 onto a chamber wall; FIG. 14 is a schematic view of a combination of a stator assembly, a second rotor assembly and a pump shaft in FIG. 10; FIG. 15 is a schematic view of the pump shaft in FIG. 10; FIG. 16 is a schematic sectional view of a first embodiment of the pump shaft shown in FIG. 15; FIG. 17 is a schematic sectional view of a second embodiment of the pump shaft shown in FIG. 15; FIG. 18 is a schematic view of a pump cover in FIG. 10 from a first perspective; FIG. 19 is another schematic view of the pump cover in FIG. 10 from a second perspective; FIG. 20 is a schematic view of the first rotor assembly in FIG. 1 or FIG. 10; FIG. 21 is a schematic view of an electronic control assembly in FIG. 10; FIG. 22 is a schematic sectional view of the electronic control assembly shown in FIG. 10; FIG. 23 is a schematic view showing an embodiment of projections of a chamber inflow passage and a chamber outflow passage in FIG. 10 onto a first surface; FIG. 24 is a schematic view showing another embodiment of the projections of the chamber inflow passage and the chamber outflow passage in FIG. 10 onto the first surface; FIG. 25 is a schematic view of a second surface of a circuit board shown in FIG. 24; FIG. 26 is a schematic view showing another embodiment of the projections of the chamber inflow passage and the chamber outflow passage in FIG. 10 onto the first surface; FIG. 27 is a schematic view of a second surface of a circuit board shown in FIG. 26; FIG. 28 is a schematic view of an electric pump according to an embodiment of the present application; FIG. 29 is a schematic view of projections of a chamber inflow passage and a chamber outflow passage in FIG. 28 onto a first surface; FIG. 30 is a schematic view showing a first embodiment of an electric pump according to the present application; FIG. 31 is an exploded schematic view of the electric pump shown in FIG. 30; FIG. 32 is a schematic sectional view taken along line B-B in FIG. 30; FIG. 33 is an enlarged schematic view of part C in FIG. 32; FIG. 34 is a schematic view showing a first embodiment of a rotating assembly shown in FIG. 32; FIG. 35 is a schematic sectional view taken along line D-D in FIG. 34 according to a first embodiment; FIG. 36 is a schematic sectional view taken along line D-D in FIG. 34 according to a second embodiment; FIG. 37 is a schematic view showing a second embodiment of the rotating assembly shown in FIG. 32; FIG. 38 is a schematic sectional view of the rotating assembly in FIG. 37; FIG. 39 is a schematic view showing a second embodiment of an electric pump according to the present application; FIG. 40 is an enlarged schematic view of part E in FIG. 39; FIG. 41 is a schematic view showing a third embodiment of an electric pump according to the present application; and FIG. 42 is an enlarged schematic view of part X in FIG. 41.

[0009] List of reference numerals:1.pump cover;11.first inflow passage;12.outflow passage;13.second inflow passage;14.branch passage;141.first communication portion;142.second communication portion;2.first housing;21.chamber wall;211.upper end face;212.lower end face;3.second housing;4.first rotor assembly / pump rotor;41.first rotor;42.second rotor;43.hydraulic chamber;431.first hydraulic chamber;432.second hydraulic chamber;5.stator assembly;51.stator core;52.winding;53.upper end;6.second rotor assembly / motor rotor;7.pump shaft;71.first end;72.first end face;73.second end face;70.rotating assembly;701.first end;702.second end;703.flow passage opening;74.receiving groove;741.groove wall;7411.first side wall;7412.second side wall;75.detection member;8.electronic control assembly;81.circuit board;811.first surface / front surface;812.second surface / rear surface;813.flow guide hole;82.temperature detection unit;821.body part;822.temperature sensing part;823.conductive part;83.sensor;9.connecting part;91.accommodating groove;92.through-hole;921.first opening;922.second opening;95.receiving hole;20.first chamber;30.second chamber;40.chamber inflow passage;401.main flow passage;402.branch passage;50.chamber outflow passage;101'.first projection;102'.second projection. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present application will be further explained below with reference to the accompanying drawings and specific embodiments.

[0011] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings used in the following description show only some of the embodiments of the present application. Based on these technical solutions, those skilled in the art can obtain other technical solutions without creative effort. The orientation terms such as "upper" and "lower" mentioned herein are defined based on the relative positions of the components shown in the accompanying drawings, only for the purpose of clearly and conveniently expressing the technical solutions. It should be understood that the orientation terms used herein shall not limit the protection scope claimed in the present application.

[0012] An electric pump may be applied in a lubrication system and / or a cooling system of a vehicle to provide circulating power for a working medium in the lubrication system and / or the cooling system of the vehicle. The lubrication system and / or the cooling system of the vehicle may provide lubricating oil and / or cooling oil for a transmission system. In the present application, the expression "A is fixedly connected to B" means that no relative displacement will occur between A and B after connection, for example, A and B are welded and fixed together. The expression "A is position-limitedly connected to B" means that a movement of B is limited by A in a certain direction, or vice versa, a movement of A is limited by B in a certain direction.

[0013] Referring to FIGS. 1 to 32, 39 and 41, an electric pump includes a pump housing, which includes a pump cover 1, a first housing 2 and a second housing 3. The pump cover 1 is fixedly connected to the first housing 2, for example, the pump cover 1 is connected to the first housing 2 by screws or bolts. Certainly, the pump cover 1 may also be connected to the first housing 2 by other connection manners, such as plug-in connection or snap-fit connection. The first housing 2 is fixedly connected to the second housing 3, for example, the first housing 2 is connected to the second housing 3 by screws or bolts, facilitating the assembly and disassembly of the electric pump.

[0014] The electric pump includes a first rotor assembly (or a pump rotor) 4, a stator assembly 5, a second rotor assembly (or a motor rotor) 6, a rotating assembly 7 and an electronic control assembly 8. The stator assembly 5 is arranged around an outer periphery of the second rotor assembly 6. The stator assembly 5 is configured to surround the second rotor assembly 6 from a radial outer side of the second rotor assembly 6. The electric pump has a first chamber 20 and a second chamber 30. The first chamber 20 is in communication with the second chamber 30. The first rotor assembly 4 (or at least a portion of the first rotor assembly 4) is arranged in the second chamber 30. The electronic control assembly 8, the second rotor assembly 6 (or at least a portion of the second rotor assembly 6), at least a portion of the rotating assembly 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are arranged in the first chamber 20. The electronic control assembly 8 and the stator assembly 5 are arranged in the same chamber, enabling a reduction in an axial dimension of the electric pump and a compact structure, thereby reducing the production costs of the electric pump.

[0015] The first rotor assembly 4 includes a first rotor 41 and a second rotor 42. The first rotor 41 includes several internal teeth, and the second rotor 42 includes several external teeth. The electric pump has a hydraulic chamber 43, which is located between the first rotor 41 and the second rotor 42. The stator assembly 5 is electrically connected to the electronic control assembly 8. The stator assembly 5 includes a stator core 51 and a winding 52. When the electric pump is in operation, the electronic control assembly 8 is configured to control a current in the winding 52 of the stator assembly 5 to vary according to a predetermined pattern, thereby enabling the stator assembly 5 to generate a varying excitation magnetic field. The second rotor assembly 6 rotates under an influence of this excitation magnetic field, and is configured to directly or indirectly drive the first rotor assembly 4 to rotate. In this embodiment, the rotating assembly 70 includes a pump shaft 7, which is in transmission connection with both the first rotor assembly 4 and the second rotor assembly 6. Specifically, one side of the pump shaft 7 is connected to the second rotor 42, whereas the other side of the pump shaft 7 is connected to the second rotor assembly 6. The second rotor assembly 6 is configured to drive the second rotor 42 to rotate via the pump shaft 7, thereby achieving the rotation of the first rotor assembly 4.

[0016] The first rotor 41 is arranged around an outer periphery of the second rotor 42 and is internally meshed with the second rotor 42. In other embodiments, the first rotor 41 and the second rotor 42 may be externally meshed with each other, in which case the first rotor 41 and the second rotor 42 may be arranged side by side. In this embodiment, a central axis of the first rotor 41 is offset from that of the second rotor 42, meaning that there is a certain eccentricity between the central axes of both the first rotor 41 and the second rotor 42. When the second rotor 42 rotates, at least some of the external teeth of the second rotor 42 are meshed with at least some of the internal teeth of the first rotor 41, thereby enabling the second rotor 42 to drive the first rotor 41 to rotate.

[0017] The electric pump includes a first inflow passage 11 and an outflow passage 12. The first inflow passage 11 is used for inflow of the working medium, and the outflow passage 12 is used for outflow of the working medium. Specifically, the working medium may enter the hydraulic chamber 43 through the first inflow passage 11, and exit the hydraulic chamber 43 through the outflow passage 12. During one complete rotation of the first rotor assembly 4, a volume of the hydraulic chamber 43 between at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 will change. Specifically, during the rotation of the first rotor assembly 4 from its starting position to a certain angle, the volume of the hydraulic chamber 43 formed between the at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 gradually increases, creating a partial vacuum. At this point, the working medium is drawn into the hydraulic chamber 43 from the first inflow passage 11. During the continuous rotation of the first rotor 41 and the second rotor 42, the volume of the hydraulic chamber 43 formed between the at least one internal tooth of the first rotor 41 and the corresponding outer tooth of the second rotor 42 gradually decreases to compress the working medium. Thus, the working medium is expelled from the hydraulic chamber 43 into the outflow passage 12, generating a motive force for flow. A flow path of the working medium described above is denoted as S1 in FIG. 1 or 10.

[0018] The hydraulic chamber 43 includes a first hydraulic chamber 431 and a second hydraulic chamber 432. To more clearly distinguish the first hydraulic chambers 431 and the second hydraulic chamber 432, reference is made to FIG. 13, where two different types of hatching patterns are used to distinguish them. In this embodiment, referring to FIG. 10, the first rotor assembly 4 rotates in a counterclockwise direction. The term "counterclockwise" used herein is defined from a top-view perspective when the un-sectioned electric pump is oriented as shown in FIG. 10. The first hydraulic chamber 431 includes several first hydraulic sub-chambers, and the second hydraulic chamber 432 includes several second hydraulic sub-chambers. Along a rotation direction of the first rotor assembly 4, the volume of the first hydraulic sub-chamber gradually increases, thereby creating a partial vacuum. At this point, the working medium is drawn into the first hydraulic sub-chamber. In the second hydraulic chamber 432, along the rotation direction of the first rotor assembly 4, the volume of the second hydraulic sub-chamber gradually decreases to compress the working medium, which is then expelled out of the second hydraulic sub-chamber, generating the motive force for flow.

[0019] Referring to FIGS. 1 to 29, the electric pump has a chamber inflow passage 40 and a chamber outflow passage 50. The chamber inflow passage 40 is in communication with the first chamber 20, and the chamber outflow passage 50 is in communication with the first chamber 20. The electronic control assembly 8 includes a circuit board 81 and a temperature detection unit 82. The temperature detection unit 82 is electrically connected to the circuit board 81, and the temperature detection unit 82 is fixedly connected to the circuit board 81. The temperature detection unit 82 is at least partially arranged on the circuit board 81. The temperature detection unit 82 is directly integrated with the electronic control assembly 8. In this way, it is unnecessary to mechanically connect the temperature detection unit 82 to an external system separately, thereby facilitating a relative reduction in mechanical connections of the system and consequently a simplification of system structure and resulting in a more compact system structure. Furthermore, the working medium may enter the first chamber 20 through the chamber inflow passage 40, which enables the working medium in the first chamber 20 to exchange heat with the electronic control assembly 8, thereby facilitating heat dissipation of the electronic control assembly 8 and thus prolonging the service life of the electric pump. Further, at least a portion of the stator assembly 5 may come into contact with the working medium in the first chamber 20, which enables the working medium in the first chamber 20 to exchange heat with the stator assembly 5, thereby facilitating heat dissipation of the stator assembly 5.

[0020] The circuit board 81 has a first surface 811 and a second surface 812. The stator assembly 5 includes an upper end 53. The first surface 811 is located closer to the upper end 53 than the second surface 812 in an axial direction of the electric pump. Orthographic projections of both the chamber inflow passage 40 and the chamber outflow passage 50 onto the first surface 811 are defined as follows: the one relatively closer to the central axis L of the electric pump is a first projection 101', and the other one relatively farther away from the central axis L of the electric pump is a second projection 102'. A maximum distance between a center O' of the first projection 101' and the second projection 102' is defined as a first distance L1. The temperature detection unit 82 is arranged within a circular area Q with the center O' of the first projection 101' as a center and the first distance L1 as a radius. In one embodiment, referring to FIGS. 28 to 29, a minimum distance between the central axis L of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is identical to that between the central axis L of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. The greater of the following two distances is defined as a first distance: a maximum distance between the central axis L of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811, and a maximum distance between the central axis L of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. An orthographic projection of the temperature detection unit 82 onto the first surface 811 is located within a circular area with the central axis L of the electric pump as a center and the first distance as a radius. In the present application, the central axis L of the electric pump is coincident with a central axis M of the pump shaft. The working medium at an inlet of the chamber inflow passage 40 has a higher pressure than that at an outlet of the chamber outflow passage 50, which results in a pressure difference between the inlet of the chamber inflow passage 40 and the outlet of the chamber outflow passage 50. In accordance with the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the first chamber 20 may flow towards the outlet of the chamber outflow passage 50, meaning that the working medium in the first chamber 20 may flow out of the first chamber 20 through the chamber outflow passage 50. The working medium in the first chamber 20 flows from the chamber inflow passage 40 to the chamber outflow passage 50. Since the temperature detection unit 82 is arranged in a relatively short flow path of the working medium, where the working medium flows at a high flow rate, and the temperature of the working medium is less affected by the heat generated by the stator assembly 5 and / or the electronic control assembly 8, thereby facilitating accurate detection of the temperature of the working medium.

[0021] The temperature detection unit 82 includes a fixing part (not shown), which is electrically connected to its body part 821 and the circuit board 81. In one embodiment, referring to FIGS. 1 to 9, the temperature detection unit 82 includes a body part 821. In a direction parallel to the axial direction of the electric pump, the body part 821 is located closer to the first surface 811 relative to the second surface 812, or the body part 821 is located farther away from the second surface 812 relative to the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is closer to the central axis of the electric pump than the orthographic projection of the chamber inflow passage 40 onto the first surface 811. That is to say, in a radial direction of the electric pump, a minimum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811 is less than that between the central axis of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the first projection 101', and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the second projection 102'. A minimum distance between the temperature detection unit 82 and the second projection 102' is less than that between the temperature detection unit 82 and the first projection 101'. Further, the temperature detection unit 82 is at least partially arranged in the second projection 102', in which case the minimum distance between the temperature detection unit 82 and the second projection 102' is zero. A flow path of the working medium from the chamber inflow passage 40 to the temperature detection unit 82 or a flow path of the working medium from the temperature detection unit 82 to the chamber outflow passage 50 may be straight, so that the working medium flows with low resistance and at a high flow rate. Consequently, the temperature detection unit 82 may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium. Furthermore, the temperature detection unit 82 is located relatively closer to the chamber inflow passage 40, enabling rapid detection of the temperature of the working medium. The temperature detection unit 82 includes the fixing part (not shown in the figure), which is electrically connected to the body part 821 and the circuit board 81.

[0022] The electric pump includes a pump shaft 7, which is at least partially arranged in the first chamber 20. The chamber outflow passage 50 extends through the first end face 72 and the second end face 73 of the pump shaft 7. The pump shaft 7 is formed with an opening in the first end face 72, and an orthographic projection of the opening of the pump shaft 7 onto the first surface 811 is the first projection 101'. The electric pump includes the pump cover 1. The first inflow passage 11 extends through an upper end face and a lower end face of the pump cover 1. The first inflow passage 11 is in communication with the second chamber 30. The electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively located on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber inflow passage 40 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber inflow passage 40 has an opening in the lower end face 212, and an orthographic projection of the opening of the chamber inflow passage 40 onto the first surface 811 is the second projection 102'. The chamber inflow passage 40 is in communication with the second chamber 30. Specifically, the second hydraulic chamber 432 is in communication with the chamber inflow passage 40, and the working medium entering the electric pump may flow from the first inflow passage 11 to the chamber inflow passage 40.

[0023] The pump cover 1 includes a branch passage 14, which is recessed from the lower end face of the pump cover 1. In the axial direction of the pump cover 1, the branch passage 14 does not extend through the upper end face of the pump cover 1. As shown in a fluid path S2 in FIG. 1, the branch passage 14 is in communication with both the chamber outflow passage 50 and the first inflow passage 11, so that the working medium in the first chamber 20 may flow through the chamber outflow passage 50 and the branch passage 14 into the first inflow passage 11, and then be discharged from the outflow passage 12. Such discharge of the working medium from the first chamber 20 into the first inflow passage 11 facilitates an increase in an inlet flow of the pump, thereby enhancing the pump efficiency. Furthermore, since the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8) is arranged in the first chamber 20, the flowing working medium may carry away at least a portion of the heat generated by the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8), thereby enhancing the heat dissipation efficiency of the stator assembly 5 (or both the stator assembly 5 and the electronic control assembly 8), and consequently meeting heat dissipation requirements for the high-power electric pump. The branch passage 14 includes a first communication portion 141 and a second communication portion 142. The first communication portion 141 is in direct communication with the chamber outflow passage 50. In the radial direction of the pump cover 1, the second communication portion 142 is formed as a portion of a peripheral side wall of the first communication portion 141, enabling communication between the first communication portion 141 and the first inflow passage 11.

[0024] In one embodiment, referring to FIGS. 10 to 27, the orthographic projection of the chamber outflow passage 50 onto the first surface 811 is farther away from the central axis of the electric pump than the orthographic projection of the chamber inflow passage 40 onto the first surface 811. That is to say, in the radial direction of the electric pump, the minimum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is less than that between the central axis of the electric pump and the orthographic projection of the chamber outflow passage 50 onto the first surface 811. The orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the second projection 102', and the orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the first projection 101'. The minimum distance between the temperature detection unit 82 and the first projection 101' is less than that between the temperature detection unit 82 and the second projection 102'. Further, the temperature detection unit 82 is at least partially arranged within the first projection 101', meaning that the minimum distance between the temperature detection unit 82 and the first projection 101' is zero. The flow path of the working medium from the chamber inflow passage 40 to the temperature detection unit 82 or the flow path of the working medium from the temperature detection unit 82 to the chamber outflow passage 50 may be straight, so that the working medium flows with low resistance and at a high flow rate. Consequently, the temperature detection unit 82 may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium; Furthermore, the temperature detection unit 82 is located relatively closer to the chamber inflow passage 40, enabling rapid detection of the temperature of the working medium.

[0025] The electric pump includes a pump shaft 7, which is at least partially arranged in the first chamber 20. The pump shaft 7 has a first end 71 with a first end face 72. In the direction parallel to the axial direction of the electric pump, the first end 71 is located closer to the circuit board 81 than the second rotor assembly 6. The chamber inflow passage 40 is formed in the pump shaft 7, and the chamber inflow passage 40 has an opening in a second end face 73. The chamber inflow passage 40 includes a main flow passage 401 and a branch passage 402. The main flow passage 401 is in communication with the branch passage 402. The branch passage 402 has at least one opening in a side wall of the first end 71. The working medium enters the first chamber 20 through the chamber inflow passage 40 of the pump shaft 7. After following out from the chamber inflow passage 40, the working medium comes into contact with the electronic control assembly 8 prior to reaching the stator assembly 5 and / or the second rotor assembly 6. At this point, the working medium has absorbed minimal heat (or none at all). The temperature of the working medium in the second inflow passage 13 may be accurately obtained by measurement of the temperature detection unit 82. Base on the detected temperature of the working medium, the temperature of the working medium at the stator assembly 5 and the second rotor assembly 6 may be estimated for precise torque distribution. Furthermore, no sensor is needed to be arranged at the inlet of the chamber inflow passage 40, thereby facilitating a reduction in communication channels for relaying information to the electronic control assembly 8 and cost reduction.

[0026] In one embodiment, referring to FIGS. 16 and 17, an extension direction of the branch passage 402 is angled with respect to the central axis of the electric pump. In the case that the chamber inflow passage 40 includes multiple branch passages 402, an extension direction of at least one of the branch passages 402 is angled with respect to the central axis of the electric pump. Referring to FIG. 16, the branch passage 402 is arranged perpendicular to the central axis of the electric pump, meaning that the extension direction of the branch passage 402 is perpendicular to the central axis of the electric pump. The working medium flows within the branch passage 402 in the extension direction of the branch passage 402. When the electric pump is in operation, the pump shaft 7 rotates, and the working medium exiting the branch passage 402 may have a relatively large contact area with the components (such as the stator assembly 5 and the electronic control assembly 8) in the first chamber 20, enhancing the heat dissipation effect of the working medium on these components. In an embodiment, referring to FIG. 17, the branch passage 402 is arranged to be inclined with respect to the central axis of the electric pump. The extension direction of the branch passage 402 intersects with that of the first surface 811, and the extension direction of the first surface 811 is perpendicular to the central axis of the electric pump. The inclined branch passage 402 enables the working medium to flow towards the circuit board 81, facilitating rapid contact between the working medium and the circuit board 81. Further, the extension direction of the branch passage 402 intersects with that of the temperature detection unit 82, and the extension direction of the temperature detection unit 82 is perpendicular to the central axis of the electric pump, facilitating rapid contact between the working medium and the temperature detection unit 82.

[0027] The electric pump includes a second inflow passage 13, which extends through the upper end face and the lower end face of the pump cover 1. The second inflow passage 13 is in communication with the chamber inflow passage 40, allowing the working medium to directly enter the chamber inflow passage 40 from the second inflow passage 13. The working medium exiting the chamber inflow passage 40 has not absorbed any heat. In this case, the temperature of the working medium in the chamber inflow passage 40 may represent the temperature of the working medium in a gearbox. By measuring the temperature of the working medium exiting the chamber inflow passage 40, the temperature of the working medium in the gearbox may be estimated, facilitating comprehensive thermal management of an electric drive system. Furthermore, there is no need to arrange additional temperature detection unit inside the gearbox, thereby facilitating cost reduction. The electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively arranged on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber outflow passage 50 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber outflow passage 50 has an opening in the lower end face 212, and an orthographic projection of the opening of the chamber outflow passage 50 onto the first surface 811 is the second projection 102'. The chamber outflow passage 50 is in communication with both the first chamber 20 and the first hydraulic chamber 431.

[0028] Referring to FIGS. 28 and 29, the electric pump includes a chamber wall 21. The first chamber 20 and the second chamber 30 are respectively arranged on opposite sides of the chamber wall 21 in the axial direction of the electric pump. The chamber outflow passage 50 extends through an upper end face 211 and a lower end face 212 of the chamber wall 21. The chamber inflow passage 40 has a first opening in the lower end face 212. An orthographic projection of the chamber inflow passage 40 onto the first surface 811 is the orthographic projection 101' of the first opening onto the first surface 811. The chamber outflow passage 50 has a second opening in the lower end face 212. An orthographic projection of the chamber outflow passage 50 onto the first surface 811 is the orthographic projection 102' of the second opening onto the first surface 811. The chamber inflow passage 40 is in communication with both the first chamber 20 and the second hydraulic chamber. The chamber outflow passage 50 is in communication with both the first chamber 20 and the first hydraulic chamber.

[0029] Referring to FIGS. 1 to 27, the temperature detection unit 82 includes a body part 821, which is located closer to the second surface 812 relative to the first surface 811 in the direction parallel to the axial direction of the electric pump. The circuit board 81 is formed with a flow guide hole 813 that extends through both the first surface 811 and the second surface 812. The temperature detection unit 82 is spaced apart from the flow guide hole 813. Since the temperature detection unit 82 is in the flow path of the working medium, it may promptly detect the temperature of the working medium, thereby facilitating the accurate detection of the temperature of the working medium. The flow guide hole 813 is spaced apart from the first projection 101' and / or the second projection 102'. A minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than or equal to a minimum distance L3 between the first projection 101' and the flow guide hole 813. Alternatively, a minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than or equal to a minimum distance between the second projection 102' and the flow guide hole 813. The flow guide hole 813 enhances the circulation of the working medium on the second surface 812, with faster circulation of the working medium near the flow guide hole 813. The temperature detection unit 82 is located relatively closer to the flow guide hole 813, which facilitates enhancing the detection accuracy. Furthermore, the flow guide hole 813 enhances the circulation of the working medium on the second surface 812, thereby facilitating the heat dissipation of the electronic control assembly 8.

[0030] In other embodiments, the circuit board 81 is formed with multiple flow guide holes 813. The minimum distance L2 between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to the minimum distance L3 between the first projection 101' and the flow guide holes 813. The term "minimum distance" here refers to a minimum distance between the flow guide hole 813 closest to the first projection 101' and the first projection 101'. For example, the circuit board 81 is formed with a first flow guide hole and a second flow guide hole. In the case that a minimum distance (indicated by D1) between the first flow guide hole and the first projection 101' is greater than a minimum distance (indicated by D2) between the second flow guide hole and the first projection 101', and D2 is taken as the aforementioned L3. The distance L2 between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to D2.

[0031] In other embodiments, the circuit board 81 is formed with multiple flow guide holes 813. The distance between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to the minimum distance between the second projection 102' and the flow guide holes 813. The term "minimum distance" here refers to a minimum distance between the flow guide hole closest to the second projection 102' and the second projection 102'. For example, the circuit board 81 is formed with a third flow guide hole and a fourth flow guide hole. In the case that a minimum distance (indicated by D3) between the third flow guide hole and the second projection 102' is greater than a minimum distance (indicated by D4) between the fourth flow guide hole and the second projection 102', the distance between the temperature detection unit 82 and the flow guide holes 813 is less than or equal to D4.

[0032] Referring to FIGS. 26 and 27, the flow guide hole 813 is located within the first projection 101' or the second projection 102'. The minimum distance L2 between the temperature detection unit 82 and the flow guide hole 813 is less than a maximum distance L4 between the first projection 101' and the second projection 102'. In a direction parallel to the axial direction of the electric pump, the flow guide hole 813 is aligned with either the chamber inflow passage 40 or the chamber outflow passage 50. The working medium circulates more rapidly at the flow guide hole 813. The temperature detection unit 82 is located relatively closer to the flow guide hole 813, thereby facilitating enhancing the detection accuracy.

[0033] Referring to FIGS. 30 to 32, 39, and 41, the electric pump includes a detection member 75 and a sensor 83. The sensor 83 is electrically connected to the circuit board 81. The detection member 75 is arranged in correspondence with the sensor 83 to detect a phase of the second rotor assembly 6. The electric pump includes a first inflow passage 11, a second inflow passage 13, and an outflow passage 12. The first inflow passage 11 and the second inflow passage 13 allow inflow of a working medium, while the outflow passage 12 allows outflow of the working medium. The electric pump includes a chamber inflow passage 40 and a chamber outflow passage 50. The second inflow passage 13 is communication with the chamber inflow passage 40. Each of the chamber inflow passage 40 and the chamber outflow passage 50 is in communication with the first chamber 20. The working medium may enter the first chamber 20 through the chamber inflow passage 40, enabling the working medium in the first chamber 20 to exchange heat with the electronic control assembly 8, thereby facilitating the heat dissipation of the electronic control assembly 8 and consequently prolonging the service life of the electric pump. Further, the stator assembly 5 may be at least partially in contact with the working medium located in the first chamber 20, enabling the working medium in the first chamber 20 to exchange heat with the stator assembly 5, facilitating the heat dissipation of the stator assembly 5. The working medium has a higher pressure at an inlet of the chamber inflow passage 40 than that at an outlet of the chamber outflow passage 50, which results in a pressure difference of the working medium created between the inlet of the chamber inflow passage 40 and the outlet of the chamber outflow passage 50. In accordance with the principle that the working medium flows from a high-pressure area to a low-pressure area, the working medium in the first chamber 20 may flow towards the outlet of the chamber outflow passage 50, meaning that the working medium in the first chamber 20 may exit the first chamber 20 through the chamber outflow passage 50.

[0034] Referring to FIGS. 30 to 42, the electronic control assembly 8 includes a circuit board 81 and a temperature detection unit 82. The temperature detection unit 82 is electrically connected to the circuit board 81, and includes a temperature sensing part 822. The rotating assembly 70 has a first end 701. The chamber inflow passage 40 has a flow passage opening 703 in an end face of the first end 701, and the temperature sensing part 822 is at least partially arranged in the chamber inflow passage 40. Alternatively, the chamber inflow passage 40 has a flow passage opening 703 in a side wall of the first end 701, and the temperature sensing part 822 is configured to be at least partially aligned with the flow passage opening 703 in the radial direction of the electric pump. When the electric pump is in operation, the working medium in the lubrication system and / or the cooling system may flow through the flow passage opening 703 into the first chamber 20. The temperature detection unit 82 may be arranged close to the flow passage opening 703, and thus it may promptly detect the temperature of the working medium in the lubrication system and / or the cooling system, thereby facilitating the accurate detection of the temperature of the working medium in the lubrication system and / or the cooling system. The circuit board 81 includes a front surface 811. In a direction parallel to the axial direction of the electric pump, the temperature detection unit 82 extends from the front surface 811 by a length h1 that is greater than a minimum distance h2 between the front surface 811 and the flow passage opening 703 and less than or equal to a maximum distance h3 between the front surface 811 and the flow passage opening 703. The temperature detection unit 82 may promptly detect the temperature of the working medium exiting the flow passage opening 703.

[0035] In one embodiment, referring to FIGS. 39 and 40, the rotating assembly 70 includes a pump shaft 7. The motor rotor 6 is fixedly or position-limitedly connected to the pump shaft 7. The chamber inflow passage 40 extends through a first end face 72 and a second end face 73 of the pump shaft 7. The first end 701 has the first end face 72. The flow passage opening 703 of the chamber inflow passage 40 is formed in the first end face 72, and the temperature sensing part 822 is at least partially arranged in the chamber inflow passage 40. When the electric pump is in operation, the working medium may directly enter the first chamber 20 from the chamber inflow passage 40. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, there may be a relatively large contact area between the temperature sensing part 822 and the working medium in the chamber inflow passage 40, thereby enhancing the detection accuracy of the temperature detection unit 82.

[0036] In one embodiment, referring to FIGS. 30 to 37, the rotating assembly 70 has a second end 702. The second end 702 is farther away from the circuit board 81 than the first end 701 in the axial direction of the electric pump. The rotating assembly 70 includes a pump shaft 7. The rotating assembly 70 is formed with a receiving groove 74. The receiving groove 74 is recessed from the first end 701 towards the second end 702. The chamber inflow passage 40 has at least one flow passage opening 703 in a groove wall 741 of the receiving groove 74. The temperature sensing part 822 is at least partially arranged in the receiving groove 74. The working medium flows into the receiving groove 74 through the flow passage opening 703. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, there may be a relatively large contact area between the temperature sensing part 822 and the working medium in the receiving groove 74, which facilitates enhancing the detection accuracy of the temperature detection unit 82. In some embodiments, referring to FIGS. 35 and 36, the pump shaft 7 is formed with a receiving groove 74. Alternatively, the rotating assembly 70 includes a pump shaft 7 and a connecting part 9, which is fixedly or position-limitedly connected to the pump shaft 7 and formed with a receiving groove 74, thereby simplifying the manufacturing process for the rotating assembly 70.

[0037] The groove wall 741 includes a first side wall 7411 and a second side wall 7412. In the radial direction of the electric pump, the first side wall 7411 is located closer to the central axis of the electric pump than the second side wall 7412. The at least one flow passage opening 703 of the chamber inflow passage 40 is formed in the first side wall 7411 of the receiving groove 74. The temperature detection unit 82 may be at least partially arranged between the flow passage opening 703 and the second side wall 7412 in the radial direction of the electric pump. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. Further, in the radial direction of the electric pump, the temperature sensing part 822 is arranged between the flow passage opening 703 and the second side wall 7412, and the temperature detection unit 82 may promptly detect the temperature of the working medium after the working medium flows out of the flow passage opening 703, thereby facilitating the accurate detection of the temperature of the working medium. The first end 701 has a greater width than the second end 702 in the radial direction of the electric pump, enabling the first side wall 7411 to be radially spaced apart from the second side wall 7412. In this way, the receiving groove 74 may provide a relatively large space for receiving the temperature detection unit 82, thereby facilitating a reduction in assembly precision required for the temperature detection unit 82 and consequently enhancing assembly efficiency of the electric pump.

[0038] In one embodiment, referring to FIGS. 37 and 38, the rotating assembly 70 includes a pump shaft 7 and a connecting part 9. The pump shaft 7 is integrated with the connecting part 9, which is formed by injection molding using the pump shaft 7 as an insert. Alternatively, the pump shaft 7 is separated from the connecting part 9, which is formed by injection molding and is fixedly or position-limitedly connected to the pump shaft 7, thereby simplifying the manufacturing process. The connecting part 9 is fixedly or position-limitedly connected to the pump shaft 7. A side wall of the first end 701 includes an outer side wall of the pump shaft 7. The flow passage opening 703 of the chamber inflow passage 40 is formed in the outer side wall of the pump shaft 7. The connecting part 9 is formed with an accommodating groove 91 and a through-hole 92. The accommodating groove 91 is in communication with the through-hole 92, which is in communication with both the flow passage opening 703 and the first chamber 20. The temperature sensing part 822 is at least partially arranged in the through-hole 92. The working medium in the chamber inflow passage 40 flows into the first chamber 20 through the through-hole 92. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium.

[0039] Referring to FIGS. 37 and 38, a hole wall of the through-hole 92 includes a portion of a groove wall of the accommodating groove 91. The through-hole 92 has a first opening 921 in an inner side wall of the connecting part 9, and the first opening 921 is in communication with the flow passage opening 703. The through-hole 92 further has a second opening 922 in an outer side wall of the connecting part 9, and the second opening 922 is in communication with the first chamber 20. The working medium may enter the first chamber 20 through the second opening 922. The working medium in the first chamber 20 may exchange heat with the electronic control assembly 8, thereby facilitating the heat dissipation of the electronic control assembly 8 and consequently prolonging the service life of the electric pump. The temperature detection unit 82 includes a temperature sensing part 822 and a conductive part 823. The conductive part 823 is electrically connected to both the circuit board 81 and the temperature sensing part 822. The conductive part 823 generally has a relatively small radial cross-sectional area and low resistance to a radial impact. The conductive part 823 is at least partially arranged in the accommodating groove 91, which helps reduce the impact from the working medium on the conductive part 823, thereby improving the reliability of connection between the temperature detection unit 82 and the circuit board 81. The connecting part 9 is formed with a receiving hole 95. The pump shaft 7 is at least partially arranged in the receiving hole 95. A side wall defining the receiving hole 95 is fixedly or position-limitedly connected to at least a portion of the outer side wall of the pump shaft 7. The temperature detection unit 82 may be arranged close to the flow passage opening 703. In this way, the temperature of the working medium is less affected by other factors when it is detected by the temperature detection unit 82, thereby facilitating the accurate detection of the temperature of the working medium. In addition, the detection member 75 may be fixedly or position-limitedly connected to the connecting part 9. The detection member may be arranged close to the sensor 83 by virtue of the connecting part 9, thereby enhancing accuracy of the sensor 83 in sensing the detection member 75. Furthermore, the pump shaft 7 is generally made of a magnetic conductive material, and the connecting part 9 is made of for example a plastic material. The pump shaft 7 is separated from the detection member 75 by the connecting part 9, thereby reducing the influence of the pump shaft 7 on magnetic induction lines of the detection member 75 and consequently enhancing the accuracy of the sensor 83 in sensing magnetism.

[0040] It should be noted that the above embodiments are only intended to illustrate the present application rather than to limit the technical solutions described in the present application. Although the present specification has been described in detail with reference to the embodiments as described above, it should be understood by those skilled in the art that modifications or equivalent substitutions may still be made by those skilled in the art to the technical solutions of the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application shall fall within the scope claimed by the claims of the present application.

Examples

Embodiment Construction

[0010]The present application will be further explained below with reference to the accompanying drawings and specific embodiments.

[0011]In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the accompanying drawings used in the following description show only some of the embodiments of the present application. Based on these technical solutions, those skilled in the art can obtain other technical solutions without creative effort. The orientation terms such as "upper" and "lower" mentioned herein are defined based on the relative positions of the components shown in the accompanying drawings, only for the purpose of clearly and conveniently expressing the technical solutions. It should be understood that the orientation terms used herein shall not limit the protection scope c...

Claims

1. An electric pump, comprising: an electronic control assembly (8) and a stator assembly (5), wherein the stator assembly (5) is electrically connected to the electronic control assembly (8); a first chamber (20), wherein both the electronic control assembly (8) and the stator assembly (5) are arranged in the first chamber (20); and a chamber inflow passage (40) and a chamber outflow passage (50), wherein both the chamber inflow passage (40) and the chamber outflow passage (50) are in communication with the first chamber (20), wherein the electronic control assembly (8) comprises a circuit board (81) and a temperature detection unit (82), which is fixedly and electrically connected to the circuit board (81), the circuit board (81) has a first surface (811) and a second surface (812), the stator assembly (5) comprises an upper end (53), and the first surface (811) is located closer to the upper end (53) than the second surface (812) in an axial direction of the electric pump, and wherein orthographic projections of both the chamber inflow passage (40) and the chamber outflow passage (50) onto the first surface (811) are defined as follows: the one relatively closer to a central axis of the electric pump is a first projection (101'), and the other one relatively farther away from the central axis of the electric pump is a second projection (102'), a maximum distance between a center of the first projection (101') and the second projection (102') is defined as a first distance, and an orthographic projection of the temperature detection unit (82) onto the first surface (811) is located within a circular area with the center of the first projection (101') as a center and the first distance as a radius; or wherein a minimum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage (40) onto the first surface (811) is identical to that between the central axis of the electric pump and the orthographic projection of the chamber outflow passage (50) onto the first surface (811); the greater of the following two distances is defined as a first distance: a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber inflow passage (40) onto the first surface (811), and a maximum distance between the central axis of the electric pump and the orthographic projection of the chamber outflow passage (50) onto the first surface (811); and an orthographic projection of the temperature detection unit (82) onto the first surface (811) is located within a circular area with the central axis of the electric pump as a center and the first distance as a radius.

2. The electric pump according to claim 1, wherein the temperature detection unit (82) comprises a body part (821) that is located farther away from the second surface (812) relative to the first surface (811) in the axial direction of the electric pump, the orthographic projection of the chamber outflow passage (50) onto the first surface (811) is closer to the central axis of the electric pump than the orthographic projection of the chamber inflow passage (40) onto the first surface (811), the orthographic projection of the chamber outflow passage (50) onto the first surface (811) is the first projection (101'), and the orthographic projection of the chamber inflow passage (40) onto the first surface (811) is the second projection (102'); and a minimum distance between the temperature detection unit (82) and the second projection (102') is less than that between the temperature detection unit (82) and the first projection (101').

3. The electric pump according to claim 2, further comprising: a first rotor assembly (4) and a pump shaft (7), which is in transmission connection with the first rotor assembly (4); a second chamber (30), wherein the first rotor assembly (4) is arranged in the second chamber (30); a chamber wall (21), wherein the first chamber (20) and the second chamber (30) are respectively located on opposite sides of the chamber wall (21) in the axial direction of the electric pump, the chamber inflow passage (40) extends through an upper end face (211) and a lower end face (212) of the chamber wall (21) and has an opening in the lower end face (212), an orthographic projection of the opening of the chamber inflow passage (40) onto the first surface (811) is the second projection (102'), and wherein the first rotor assembly (4) comprises a first rotor (41) and a second rotor (42), the first rotor (41) is arranged around an outer periphery of the second rotor (42); and the electric pump further comprises a hydraulic chamber (43), which is located between the first rotor (41) and the second rotor (42) and comprises a second hydraulic chamber (432), the chamber inflow passage (40) is in communication with the second hydraulic chamber (432), the chamber outflow passage (50) extends through a first end face (72) and a second end face (73) of the pump shaft (7), the pump shaft (7) is formed with an opening in the first end face (72), and an orthographic projection of the opening of the pump shaft (7) onto the first surface (811) is the first projection (101').

4. The electric pump according to claim 1, wherein the temperature detection unit (82) comprises a body part (821), which is located farther away from the second surface (812) relative to the first surface (811) in the axial direction of the electric pump, the orthographic projection of the chamber outflow passage (50) onto the first surface (811) is farther away from the central axis of the electric pump than the orthographic projection of the chamber inflow passage (40) onto the first surface (811); the orthographic projection of the chamber outflow passage (50) onto the first surface (811) is the second projection (102'), and the orthographic projection of the chamber inflow passage (40) onto the first surface (811) is the first projection (101'), and a minimum distance between the temperature detection unit (82) and the first projection (101') is less than that between the temperature detection unit (82) and the second projection (102').

5. The electric pump according to claim 4, further comprising: a first rotor assembly (4), a second rotor assembly (6) and a pump shaft (7), which is in transmission connection with both the first rotor assembly (4) and the second rotor assembly (6); a second chamber (30), wherein the first rotor assembly (4) is arranged in the second chamber (30); a chamber wall (21), wherein the first chamber (20) and the second chamber (30) are respectively located on opposite sides of the chamber wall (21) in the axial direction of the electric pump, the chamber outflow passage (50) extends through an upper end face (211) and a lower end face (212) of the chamber wall (21) and has an opening in the lower end face (212), an orthographic projection of the opening of the chamber outflow passage (50) onto the first surface (811) is the second projection (102'); wherein the first rotor assembly (4) comprises a first rotor (41) and a second rotor (42), wherein the first rotor (41) is arranged around an outer periphery of the second rotor (42), and the electric pump further comprises a hydraulic chamber (43), which is located between the first rotor (41) and the second rotor (42) and comprises a first hydraulic chamber (431), and the chamber outflow passage (50) is in communication with the first hydraulic chamber (431), wherein the pump shaft (7) has a first end (71), which is located closer to the circuit board (81) than the second rotor assembly (6) in the axial direction of the electric pump, the chamber inflow passage (40) is formed in the pump shaft (7), and the chamber inflow passage (40) comprises a branch passage (402), which has an opening in a side wall of the first end (71), and wherein an extension direction of the branch passage (402) is angled with respect to the central axis of the electric pump, or intersects with an extension direction of the first surface (811), and the extension direction of the first surface (811) is perpendicular to the central axis of the electric pump.

6. The electric pump according to claim 1, wherein the temperature detection unit (82) comprises a body part (821), which is located closer to the second surface (812) relative to the first surface (811) in the axial direction of the electric pump, the circuit board (81) is formed with a flow guide hole (813) extending through the first surface (811) and the second surface (812), and the temperature detection unit (82) is spaced apart from the flow guide hole (813).

7. The electric pump according to claim 6, wherein the flow guide hole (813) is spaced apart from the first projection (101') and / or the second projection (102'), and a minimum distance between the temperature detection unit (82) and the flow guide hole (813) is less than or equal to that between the first projection (101') and the flow guide hole (813); or a minimum distance between the temperature detection unit (82) and the flow guide hole (813) is less than or equal to that between the second projection (102') and the flow guide hole (813).

8. The electric pump according to claim 6, wherein the flow guide hole (813) is located within the first projection (101') or the second projection (102'), and a minimum distance between the temperature detection unit (82) and the flow guide hole (813) is less than a maximum distance between the first projection (101') and the second projection (102').

9. The electric pump according to claim 1, further comprising a rotating assembly (70), which is at least partially arranged in the first chamber (20), wherein the temperature detection unit (82) comprises a temperature sensing part (822), and the rotating assembly (70) has a first end (701), and the chamber inflow passage (40) has a flow passage opening (703) in an end face of the first end (701), the flow passage opening (703) is in communication with the first chamber (20), and the temperature sensing part (822) is at least partially arranged in the chamber inflow passage (40); or the chamber inflow passage (40) has a flow passage opening (703) in a side wall of the first end (701), and the temperature sensing part (822) is configured to be at least partially aligned with the flow passage opening (703) in a radial direction of the electric pump.

10. The electric pump according to claim 9, wherein the rotating assembly (70) comprises a pump shaft (7), the electric pump comprises a motor rotor (6) that is fixedly or position-limitedly connected to the pump shaft (7), the chamber inflow passage (40) extends through a first end face (72) and a second end face (73) of the pump shaft (7), the first end (701) has the first end face (72), the flow passage opening (703) of the chamber inflow passage (40) is formed in the first end face (72), and the temperature sensing part (822) is at least partially arranged in the chamber inflow passage (40).

11. The electric pump according to claim 9, wherein the rotating assembly (70) has a second end (702), which is farther away from the circuit board (81) than the first end (701) in the axial direction of the electric pump, the rotating assembly (70) is formed with a receiving groove (74) that is recessed from the first end (701) towards the second end (702), the chamber inflow passage (40) has at least one flow passage opening (703) in a groove wall (741) of the receiving groove (74), and the temperature sensing part (822) is at least partially arranged in the receiving groove (74).

12. The electric pump according to claim 11, wherein the groove wall (741) comprises a first side wall (7411) and a second side wall (7412), the first side wall (7411) is located closer to the central axis of the electric pump than the second side wall (7412) in the radial direction of the electric pump, the at least one flow passage opening (703) of the chamber inflow passage (40) is formed in the first side wall (7411), and the temperature sensing part (822) is configured to be at least partially arranged between the flow passage opening (703) and the second side wall (7412) in the radial direction of the electric pump.

13. The electric pump according to claim 9, wherein the rotating assembly (70) comprises a pump shaft (7) and a connecting part (9), which is fixedly or position-limitedly connected to or integrated with the pump shaft (7), the side wall of the first end (701) comprises an outer side wall of the pump shaft (7), the flow passage opening (703) of the chamber inflow passage (40) is formed in the outer side wall of the pump shaft (7), the connecting part (9) is formed with an accommodating groove (91) and a through-hole (92), wherein the accommodating groove (91) is in communication with the through-hole (92), the through-hole (92) is in communication with both the flow passage opening (703) and the first chamber (20), and the temperature sensing part (822) is at least partially arranged in the through-hole (92).

14. The electric pump according to claim 13, wherein a hole wall of the through-hole (92) comprises a portion of a groove wall of the accommodating groove (91), the through-hole (92) has a first opening (921) in an inner side wall of the connecting part (9), the first opening (921) is in communication with the flow passage opening (703), the through-hole (92) further has a second opening (922) in an outer side wall of the connecting part (9), and the second opening (922) is in communication with the first chamber (20). The electric pump according to claim 13, wherein the temperature detection unit (82) comprises a conductive part (823), which is electrically connected to both the circuit board (81) and the temperature sensing part (822), and the conductive part (823) is at least partially arranged in the accommodating groove (91).

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