An electric pump

Abstract

The application relates to an electric pump, which comprises a motor housing and a pump rotor, the motor housing has a containing groove, the pump rotor is located in the containing groove, a corresponding wall part of the containing groove comprises a side part and a partition part, the motor housing comprises a reinforcing part; in the axial direction of the electric pump, the reinforcing part extends from the partition part in a direction away from the pump rotor, or in the radial direction of the electric pump, the reinforcing part extends from the side part to the inner wall of the motor housing, and the application has the characteristics of reducing the noise of the electric pump.

Description

Technical Field

[0001] This application relates to the fields of lubrication and / or refrigeration, and more particularly to an electric pump for vehicles. Background Technology

[0002] An electric pump consists of a motor housing, a pump cover, and a pump rotor. The motor housing and the pump cover are fixedly connected to form a pump chamber. The pump rotor is located in the pump chamber. When the electric pump is working, the rotation of the pump rotor will generate a vibration source. The vibration generated by the vibration source will cause the motor housing itself to deform and vibrate, resulting in a relatively loud noise from the electric pump. Utility Model Content

[0003] This application provides an electric pump that helps reduce the noise of the electric pump.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] An electric pump includes a motor housing and a pump rotor. The motor housing has a receiving groove, the pump rotor is located in the receiving groove, and the wall portion corresponding to the receiving groove includes a side portion and a partition portion. The motor housing includes a reinforcing portion. In the axial direction of the electric pump, the reinforcing portion extends from the partition portion in a direction away from the pump rotor, or in the radial direction of the electric pump, the reinforcing portion extends from the side portion to the inner wall of the motor housing.

[0006] In the above technical solution, the pump rotor is located in the receiving groove, and the wall of the receiving groove includes a side part and a partition part. The motor housing includes a reinforcing part. In the axial direction of the electric pump, the reinforcing part extends from the partition part in a direction away from the pump rotor, or in the radial direction of the electric pump, the reinforcing part extends from the side part to the inner wall of the motor housing. The reinforcing part helps to improve the dynamic stiffness of the motor housing, thereby helping to reduce the amplitude of deformation and vibration of the motor housing caused by the rotation of the pump rotor when the electric pump is working, and further helping to reduce the noise of the electric pump. Attached Figure Description

[0007] Figure 1 This is a cross-sectional schematic diagram of the first embodiment of the electric pump of this application;

[0008] Figure 2 for Figure 1 A schematic diagram of the motor housing from a first-person perspective;

[0009] Figure 3 for Figure 1 A schematic diagram of the motor housing from a second perspective;

[0010] Figure 4 For this Figure 1 A cross-sectional schematic diagram of the motor housing;

[0011] Figure 5A cross-sectional schematic diagram of the second embodiment of the electric pump;

[0012] Figure 6 for Figure 5 A schematic diagram of the motor housing from a first-person perspective;

[0013] Figure 7 for Figure 5 A schematic diagram of the motor housing from a second perspective;

[0014] Figure 8 This is a cross-sectional schematic diagram of the third embodiment of the electric pump of this application;

[0015] Figure 9 for Figure 8 A schematic diagram of the motor housing from a first-person perspective;

[0016] Figure 10 for Figure 8 A schematic diagram of the motor housing from a second perspective;

[0017] Figure 11 for Figure 8 A cross-sectional schematic diagram of the motor housing;

[0018] Figure 12 for Figure 8 Schematic diagram of the structure of the pump cover;

[0019] Figure 13 for Figure 1 or Figure 5 or Figure 8 A frontal view of the rotor of the medium-sized pump projected onto the bottom wall of the partition section.

[0020] Reference numerals: 1. Pump housing; 11. Pump cover; 111. First pin hole; 12. Motor housing; 120. Side; 1201. First side wall; 1202. Second side wall; 121. Partition; 1211. First wall; 12111. First partition wall; 12112. Second partition wall; 122. Receiving groove; 123. Reinforcing part; 1231. First reinforcing part; 1232. Second reinforcing part; 1233. Third reinforcing part; 1234. First reinforcing part; 1235. Third wall; 124. Support part; 125. Sealing groove; 126. Groove; 1261. Inner groove wall; 1262. Outer groove wall; 1263. Bottom wall; 127. Recessed portion; 128. End face; 129. Second pin hole; 12a. Weight reduction groove; 12b. First groove wall; 12c. Second groove wall; 12d. Reinforcing rib; 13. Bottom cover; 2. Channel; 21. First inner wall; 22. Second inner wall; 23. Front end; 24. Rear end; 3. Seal; 4. Pump rotor; 41. Inner rotor; 42. Outer rotor; 43. Hydraulic chamber; 431. Low-pressure chamber; 432. High-pressure chamber; 5. Stator assembly; 6. Motor rotor; 7. Pump shaft; 71. First part; 72. Second part; 73. Third part; 8. Electrical control assembly; 81. Circuit board; 10. Pump chamber; 20. Motor chamber; 30. Electrical control chamber. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this application, the specific embodiments are further described in detail below. Obviously, the embodiments described below are merely some embodiments of this application. For those skilled in the art, other technical solutions can be obtained based on these technical solutions without creative effort.

[0022] Electric pumps can be applied to automotive lubrication and / or cooling systems, providing circulating power for the working medium in these systems, which in turn provide lubricating oil and / or cooling oil to the transmission system. In this application, "A and B fixed connection" means that there is no relative displacement between A and B after the connection, such as A and B being welded together; "A and B limiting connection" means that A restricts B's movement in a certain direction, or B restricts A's movement in a certain direction.

[0023] Please refer to Figures 1 to 13The electric pump includes a pump housing 1, which includes a pump cover 11 and a motor housing 12. The pump cover 11 is fixedly connected to the motor housing 12, for example, by screws or bolts. Alternatively, the pump cover 11 and motor housing 12 can be connected by other methods, such as plug-in or snap-fit ​​connections. Referring to the figure, the electric pump also includes a bottom cover 13, which is fixedly connected to the motor housing 12, for example, by screws or bolts. This connection facilitates easy assembly and disassembly of the electric pump. The electric pump includes a pump rotor 4, a stator assembly 5, a motor rotor 6, a pump shaft 7, and an electrical control assembly 8. The motor rotor 6 is located radially inside the stator assembly 5 and is drively connected to the pump rotor 4. The pump rotor 4 includes an inner rotor 41 and an outer rotor 42. The inner rotor 41 includes multiple external teeth, and the outer rotor 42 includes multiple internal teeth. The outer rotor 42 is located on the outer periphery of the inner rotor 41, and the inner rotor 41 and the outer rotor 42 are internally meshed. In other embodiments, the inner rotor 41 and the outer rotor 42 are externally meshed, in which case the outer rotor 42 and the inner rotor 41 are arranged side by side. In this embodiment, the central axis of the outer rotor 42 is offset from the central axis of the inner rotor 41, that is, there is a certain eccentricity between the central axis of the outer rotor 42 and the central axis of the inner rotor 41. When the inner rotor 41 rotates, at least some of the external teeth of the inner rotor 41 mesh with at least some of the internal teeth of the outer rotor 42, thereby enabling the inner rotor 41 to drive the outer rotor 42 to rotate. The stator assembly 5 includes windings (not shown). When the electric pump is working, the electronic control assembly 8 controls the current in the windings of the stator assembly 5 to change according to a predetermined pattern, thereby controlling the stator assembly 5 to generate a changing excitation magnetic field. The motor rotor 6 rotates under the action of the excitation magnetic field. The motor rotor 6 can directly or indirectly drive the pump rotor 4 to rotate. The pump shaft 7 is driven by the pump rotor 4 and the motor rotor 6. Specifically, one end of the pump shaft 7 is driven by the inner rotor 41, and the other end of the pump shaft 7 is driven by the motor rotor 6. The motor rotor 6 drives the inner rotor 41 to rotate through the pump shaft 7, thereby realizing the rotation of the pump rotor 4. In this embodiment, the pump shaft 7 and the pump rotor 4 are in a limiting fit, and the pump shaft 7 is fixedly connected to the motor rotor 6. It should be noted that the axial direction of the electric pump here and below is the axial extension direction of the pump shaft 7, the central axis of the electric pump is the central axis of the pump shaft 7, the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump, "radial outer" is the direction away from the central axis of the pump shaft 7 relative to the central axis of the pump shaft 7, and "radial inner" is the direction closer to the central axis of the pump shaft 7 relative to the central axis of the pump shaft 7.

[0024] Please refer to Figure 5The electric pump has a pump chamber 10 and a motor chamber 20, which are connected. A pump rotor 4 (or at least a portion of the pump rotor 4) is located in the pump chamber 10, while a motor rotor 6 (or at least a portion of the motor rotor 6), at least a portion of the pump shaft 7, a stator assembly 5 (or at least a portion of the stator assembly 5), and an electronic control assembly 8 are located in the motor chamber 20. When the electric pump is operating, the pump chamber 10 can contain a working medium, and at least a portion of the working medium in the pump chamber 10 flows into the motor chamber 20, providing heat dissipation for the stator assembly 5 and the electronic control assembly 8. For other embodiments, please refer to... Figure 1 or Figure 8 The electric pump has a pump chamber 10, a motor chamber 20, and an electrical control chamber 30. The pump chamber 10 is connected to the motor chamber 20, while the motor chamber 20 and the electrical control chamber 30 are not connected. The pump rotor 4 (or at least part of the pump rotor 4) is located in the pump chamber 10, and the motor rotor 6 (or at least part of the motor rotor 6), at least part of the pump shaft 7, and the stator assembly 5 (or at least part of the stator assembly 5) are located in the motor chamber 20. When the electric pump is working, the pump chamber 10 can have a working medium, and part of the working medium in the pump chamber 10 flows into the motor chamber 20. The motor chamber 20 and the electrical control chamber 30 are not connected, and the electrical control assembly 8 is located in the electrical control chamber 30, which is beneficial for the circuit board 81 of the electrical control assembly 8 to be unaffected by the working medium.

[0025] Please refer to Figures 1 to 13 The motor housing 12 has a receiving groove 122, and the pump rotor 4 is located in the receiving groove 122. The wall portion corresponding to the receiving groove 122 includes a side portion 120 and a partition portion 121. The motor housing 12 includes a reinforcing portion 123. In the axial direction of the electric pump, the reinforcing portion 123 extends from the partition portion 121 in a direction away from the pump rotor 4, or in the radial direction of the electric pump, the reinforcing portion 123 extends from the side portion 120 to the inner wall of the motor housing 12. When the electric pump is working, the rotation of the pump rotor 4 generates a vibration source. The vibration generated by the vibration source causes the motor housing 12 to undergo large-amplitude deformation vibration. The reinforcing portion 123 helps to increase the dynamic stiffness of the motor housing 12, thereby helping to reduce the vibration amplitude of the motor housing 12 and thus helping to reduce the noise of the electric pump.

[0026] Please refer to 1 to 2. Figure 4 and Figure 13The motor housing 12 includes a support portion 124. In the axial direction of the electric pump, at least a portion of the support portion 124 extends from the partition portion 121 in a direction away from the pump rotor 4. The support portion 124 is in a limiting fit with the pump shaft 7. In the radial direction of the electric pump, a reinforcing portion 123 extends from the outer wall surface of the support portion 124 to the inner wall of the motor housing 12. When the electric pump is working, the rotation of the pump shaft 7 generates a vibration source. The vibration generated by the vibration source causes the support part 124 to vibrate significantly. The reinforcing part 123 extends from the support part 124 to the inner wall of the motor housing 12, which helps to reduce the vibration amplitude of the support part 124, thereby helping to reduce the vibration amplitude of the motor housing 12 and thus reducing the noise of the electric pump. Secondly, when manufacturing the motor housing 12, the fluid (such as molten metal or molten plastic) flows from the mold of the reinforcing part to the mold of the support part. The mold of the reinforcing part can play a guiding role, allowing the fluid to flow to the mold of the support part more quickly. The fluid cooling and shrinkage can be more uniform. The fluid in the mold of the reinforcing part is cooled to form the reinforcing part 123, and the fluid in the mold of the support part is cooled to form the support part 124, which helps to improve the quality of the motor housing 12. The reinforcing portion 123 includes a first reinforcing portion 1231 and a second reinforcing portion 1232. In the radial direction of the electric pump, the second reinforcing portion 1232 extends from the outer wall of the support portion 124 to the first reinforcing portion 1231. Along the radial direction of the electric pump, from the support portion 124 to the first reinforcing portion 1231, the axial thickness H1 of the second reinforcing portion 1232 gradually decreases. The axial thickness of the second reinforcing portion 1232 is the same as the thickness of the second reinforcing portion 1232 in the axial direction of the electric pump. The support portion 124 is in a limiting fit with the pump shaft 7, supporting the pump shaft 7. The cross-section of the second reinforcing portion 1232 is similar to a triangle, providing better stability and enhancing the supporting effect of the support portion 124.

[0027] Please refer to Figure 1 or Figure 5 or Figure 8 The pump shaft 7 includes a first part 71, a second part 72 and a third part 73. In the axial direction of the electric pump, the second part 72 is located between the first part 71 and the third part 73. The first part 71 is fixedly connected or driven to the pump rotor 4. The second part 72 is limitedly matched with the support part 124. The third part 73 is fixedly connected or driven to the motor rotor 6.

[0028] Please refer to 1 to 2. Figure 4 and Figure 13The electric pump includes a hydraulic chamber 43, which is located between the inner rotor 41 and the outer rotor 42. The pump chamber 10 includes a hydraulic chamber 43, which includes a low-pressure chamber 431 and a high-pressure chamber 432. The electric pump includes a channel 2, and the motor chamber 20 is connected to the channel 2. Part of the working medium in the low-pressure chamber 431 flows into the motor chamber 20 through the channel 2. The walls corresponding to the first channel 2 include a first inner wall 21 and a second inner wall 22. In the radial direction of the electric pump, the first inner wall 21 is closer to the central axis of the electric pump than the second inner wall 22. The channel 2 also includes a front end 23 and a rear end 24. In the circumference of the pump rotor 4, the front end 23 is farther away from the high-pressure chamber 432 than the rear end 24. The vertical distance between the first inner wall 21 and the second inner wall 22 gradually increases from the rear end 24 to the front end 23. Along the rotation direction of the pump rotor 4, the volume change process of the channel 2 is the same as the volume change process of the working medium in the low-pressure chamber 431. This is beneficial to relatively increasing the flow rate of the working medium entering the motor chamber 20 and the flow rate of the working medium flowing back from the motor chamber 20 to the low-pressure chamber 431 per unit time, thereby improving pump efficiency. In the axial direction of the electric pump, the channel 2 passes through the first wall 1211 and the second wall 1212 of the partition 121. The low-pressure chamber 431 is connected to the channel 2. At least part of the reinforcing part 123 is located in the channel 2. When the electric pump is working, the working medium flows out of the pump chamber 10 from the channel 2. The reinforcing part 123 helps to improve the impact resistance of the partition 121. For example, when the flow rate of the working medium entering the motor chamber 20 from the channel 2 per unit time increases, the reinforcing part 123 in the channel 2 helps to improve the impact resistance of the partition 121.

[0029] The reinforcing section 123 includes a third reinforcing section 1233. Along the axial direction of the electric pump, the third reinforcing section 1233 extends from the first reinforcing section 1231 toward the direction close to the pump rotor 4. The wall corresponding to the first channel 2 includes a first inner wall 21 and a second inner wall 22. In the radial direction of the electric pump, the first inner wall 21 is closer to the central axis of the electric pump than the second inner wall 22. The third reinforcing section 1233 extends from the first inner wall 21 to the second inner wall 22. When the electric pump is working, the working medium flows out of the pump chamber 10 from the channel 2. The third reinforcing section helps to improve the impact resistance of the partition section 121. Furthermore, along the circumferential direction of the electric pump, the width of the third reinforcing section 1233 is less than or equal to the width of the second reinforcing section 1232. Since the second reinforcing section 1232 can help increase the impact resistance of the third reinforcing section 1233 in the axial direction of the electric pump, it is beneficial to relatively reduce the material used in the motor housing 12 while ensuring that the second reinforcing section 1232 has a certain impact resistance, thereby helping to reduce the cost of the electric pump.

[0030] Please refer to 1 to 2. Figure 4The motor housing 12 has a weight-reducing groove 12a and an end face 128. The pump cover 11 contacts the end face 128. The weight-reducing groove 12a is recessed from the end face 128 toward the pump cover, which helps to reduce the weight of the electric pump. The weight-reducing groove 12a has a first groove wall 12b and a second groove wall 12c. The receiving groove 122 is recessed from the end face 128 toward the direction away from the pump cover 11. In the radial direction of the electric pump, the first groove wall 12b is located between the second groove wall 12c and the first side wall 1201 of the receiving groove 122. The motor housing 12 has a reinforcing rib 12d. In the radial direction of the electric pump, the reinforcing rib 12d extends from the first groove wall 12b to the second groove wall 12c. The pump chamber 10 is a pressure chamber. The chamber wall of the pump chamber 10 includes the first side wall 1201 of the receiving groove 122. By setting the reinforcing rib 12d, it is beneficial to prevent the weight-reducing groove 12a from being damaged by the radial force generated by the working medium in the pump chamber 10 when the electric pump is working. The pump cover 11 has a first pin hole (not shown), which is a through hole. The motor housing 12 has a second pin hole 129, which communicates with the first pin hole. The second pin hole 129 is recessed from the end face 128 and is a blind hole. When assembling the pump cover 11 and the motor housing 12, a process pin is inserted into the first pin hole and the second pin hole 129 to restrict the pump cover 11 and the motor housing 12 from rotating in the circumferential direction. After the pump cover 11 and the motor housing 12 are fixedly connected, the process pin is removed. In the axial direction of the electric pump, the height of the first groove wall 12b or the second groove wall 12c is greater than the depth of the second pin hole 129. Under the premise of ensuring the assembly of the pump cover 11 and the motor housing 12, this helps to further reduce the weight of the motor housing 12. The motor housing 12 has a sealing groove 125, which is recessed from the end face 128 toward the direction away from the pump cover. In the radial direction of the electric pump, the sealing groove 125 is located between the first side wall 1201 and the second pin hole 129. At least a portion of the seal 3 is located in the sealing groove 125 and at least a portion of the seal 3 is located between the pump cover 11 and the motor housing 12. This is beneficial for positioning the pump cover 11 and the motor housing 12 during assembly, and also helps to ensure the sealing of the cavity formed after the pump cover 11 and the motor housing 12 are connected.

[0031] Please refer to Figures 5 to 13The motor housing 12 has a groove 126, and the side portion 120 has a first sidewall 1201 and a second sidewall 1202. The groove wall of the receiving groove 122 includes the first sidewall 1201, and the groove wall of the groove 126 includes an inner groove wall 1261 and an outer groove wall 1262. In the radial direction of the electric pump, the inner groove wall 1261 is closer to the axis of the electric pump than the outer groove wall 1262. The inner groove wall 1261 includes the second sidewall 1202, and the reinforcing part 123 extends from the inner groove wall 1261 to the outer groove wall 1262. Especially when the motor housing 12 is made of metal, it is generally heavier than a motor housing made of plastic. The design of the groove 126 helps to reduce the weight of the motor housing 12. The groove wall of the groove 126 includes a bottom wall 1263, and the reinforcing part 123 connects to the bottom wall 1263. The manufacturing process of the motor housing 12 is relatively simple. In other embodiments, the groove wall of the groove 126 includes a bottom wall 1263. In the axial direction of the electric pump, there is a gap between the reinforcing part 123 and the bottom wall 1263, which can further reduce the weight of the motor housing 12 and help to relatively reduce the production cost of the electric pump.

[0032] The inner wall of the motor housing 12 includes an outer groove wall 1262. In the axial direction of the electric pump, the height of the inner groove wall 1261 is greater than the height of the partition 121. The height of the partition 121 is the distance between the first wall 1211 and the second wall 1212. The higher height of the inner groove wall 1261 is beneficial to reducing the weight of the motor housing 12. On the other hand, the axial height of the reinforcing part 123 can be higher, which is beneficial to improving the structural strength of the reinforcing part 123, thereby improving the dynamic stiffness of the motor housing 12, and thus helping to reduce the noise of the electric pump. The wall of the receiving groove 122 includes a first sidewall 1201. Axially, the first sidewall 1201 extends from the second wall 1212 away from the partition 121. Radially, there is a gap between the first sidewall 1201 and the inner groove wall 1261. The pump chamber 10 is a pressure chamber, and its wall includes the wall of the receiving groove 122. The gap between the first sidewall 1201 and the inner groove wall 1261 helps prevent the groove 126 from being damaged by the radial force generated by the working medium within the pump chamber 10 during operation of the electric pump. Furthermore, the radial distance between the first sidewall 1201 and the inner groove wall 1261 is greater than or equal to 2 mm, which further helps prevent the groove 126 from being damaged by the radial force generated by the working medium within the pump chamber 10 during operation of the electric pump.

[0033] The first wall 1211 includes a first partition wall 12111 and a second partition wall 12112. In the axial direction of the electric pump, the second partition wall 12112 is away from the pump rotor 4 relative to the first partition wall 12111. The motor housing 12 includes a recess 127, which is recessed from the second wall 1212 in a direction away from the pump rotor 4. The hydraulic chamber 43 includes a high-pressure chamber 432, which communicates with the recess 127. In the axial direction of the electric pump, the distance from the bottom wall of the recess 127 to the second partition wall 12112 is greater than or equal to 1.5 mm, which helps to ensure the strength of the partition 121 and prevent the partition 121 from deforming due to the axial force generated by the working medium in the pump chamber 10.

[0034] The motor housing 12 has an end face 128, and the pump cover 11 contacts the end face 128. A gap exists between the bottom wall 1263 and the end face 128 along the axial direction of the electric pump. Furthermore, the distance between the bottom wall 1263 and the end face 128 along the axial direction of the electric pump is greater than or equal to 1.5 mm, which helps ensure the structural strength of the motor housing 12. The pump cover 11 has a first pin hole 111, which is a through hole. The motor housing 12 has a second pin hole 129, which communicates with the first pin hole 111. The second pin hole 129 is recessed from the end face 128 and is a blind hole. When assembling the pump cover 11 and the motor housing 12, a process pin is inserted into the first pin hole 111 and the second pin hole 129 to restrict the pump cover 11 and the motor housing 12 from rotating in the circumferential direction. After the pump cover 11 and the motor housing 12 are fixedly connected, the process pin is removed. In the axial direction of the electric pump, the distance from the bottom wall 1263 of the groove 126 to the end face 128 is greater than the depth of the second pin hole 129. This helps to further reduce the weight of the motor housing 12 while ensuring the assembly of the pump cover 11 and the motor housing 12. In the circumferential direction of the electric pump, the reinforcing part 123 with the maximum circumferential width D1 is the first reinforcing part 1234. The diameter of the second pin hole 129 is smaller than D1, and the first reinforcing part 1234 has a portion of the second pin hole 129. This helps to further reduce the weight of the motor housing 12 while ensuring the assembly of the pump cover 11 and the motor housing 12.

[0035] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. An electric pump, characterized in that, The electric pump includes a motor housing (12) and a pump rotor (4). The motor housing (12) has a receiving groove (122), and the pump rotor (4) is located in the receiving groove (122). The wall of the receiving groove (122) includes a side portion (120) and a partition portion (121). The motor housing (12) includes a reinforcing portion (123). In the axial direction of the electric pump, the reinforcing portion (123) extends from the partition portion (121) in a direction away from the pump rotor (4), or... In the radial direction of the electric pump, the reinforcing part (123) extends from the side part (120) to the inner wall of the motor housing (12).

2. The electric pump according to claim 1, characterized in that, The motor housing (12) includes a support portion (124), at least a portion of which extends from the partition portion (121) in a direction away from the pump rotor (4). The electric pump includes a pump shaft (7), and the support portion (124) is in a limiting fit with the pump shaft (7). In the radial direction of the electric pump, the reinforcement portion (123) extends from the outer wall surface of the support portion (124) to the inner wall of the motor housing (12).

3. The electric pump according to claim 2, characterized in that, The reinforcing portion (123) includes a first reinforcing portion (1231) and a second reinforcing portion (1232). In the radial direction of the electric pump, the second reinforcing portion (1232) extends from the outer wall of the support portion (124) to the first reinforcing portion (1231). Along the radial direction of the electric pump, from the support portion (124) to the first reinforcing portion (1231), the axial thickness (H1) of the second reinforcing portion (1232) gradually decreases.

4. The electric pump according to any one of claims 1 to 3, characterized in that, The electric pump includes a hydraulic chamber (43), the pump rotor (4) includes an inner rotor (41) and an outer rotor (42), the hydraulic chamber (43) is located between the inner rotor (41) and the outer rotor (42), the hydraulic chamber (43) includes a low-pressure chamber (431), the electric pump includes a channel (2), the channel (2) penetrates the first wall (1211) and the second wall (1212) of the partition (121) in the axial direction of the electric pump, the low-pressure chamber (431) communicates with the channel (2), and at least part of the reinforcing part (123) is located in the channel (2).

5. The electric pump according to claim 4, characterized in that, The reinforcing portion (123) includes a first reinforcing portion (1231) and a third reinforcing portion (1233). Along the axial direction of the electric pump, the third reinforcing portion (1233) extends from the first reinforcing portion (1231) toward the direction close to the pump rotor (4). The wall corresponding to the channel (2) includes a first inner wall (21) and a second inner wall (22). In the radial direction of the electric pump, the first inner wall (21) is closer to the central axis of the electric pump than the second inner wall (22). The third reinforcing portion (1233) extends from the first inner wall (21) to the second inner wall (22).

6. The electric pump according to claim 1, characterized in that, The motor housing (12) has a groove (126), the side portion (120) has a first sidewall (1201) and a second sidewall (1202), the groove wall of the receiving groove (122) includes the first sidewall (1201), the groove wall of the groove (126) includes an inner groove wall (1261) and an outer groove wall (1262), in the radial direction of the electric pump, the inner groove wall (1261) is closer to the axis of the electric pump relative to the outer groove wall (1262), the inner groove wall (1261) includes the second sidewall (1202), and the reinforcing portion (123) extends from the inner groove wall (1261) to the outer groove wall (1262).

7. The electric pump according to claim 6, characterized in that, The groove (126) has a bottom wall (1263) on its groove wall, and the reinforcing part (123) is connected to the bottom wall (1263). Alternatively, in the axial direction of the electric pump, there is a gap between the reinforcing part (123) and the bottom wall (1263).

8. The electric pump according to claim 6 or 7, characterized in that, The inner wall of the motor housing (12) includes the outer groove wall (1262), and in the axial direction of the electric pump, the height of the inner groove wall (1261) is greater than the height of the partition (121).

9. The electric pump according to any one of claims 6-8, characterized in that, The electric pump includes a pump cover (11) having a first pin hole (111) and a motor housing (12) having a second pin hole (129). The first pin hole (111) communicates with the second pin hole (129). The motor housing (12) has an end face (128). The second pin hole (129) is recessed from the end face (128). In the axial direction of the electric pump, the distance from the bottom wall (1263) of the groove (126) to the end face (128) is greater than the depth of the second pin hole (129).

10. The electric pump according to claim 9, characterized in that, In the circumferential direction of the electric pump, the reinforcing part (123) having the maximum circumferential width (D1) is the first reinforcing part (1234), the diameter of the second pin hole (129) is smaller than (D1), and the first reinforcing part (1234) has a portion of the second pin hole (129).

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