Electric pump

Abstract

The utility model relates to an electric pump which comprises a motor shell, a pump shaft, a pump rotor, a stator assembly, a motor rotor and a retainer, the pump shaft comprises a first part, a second part and a third part, in the axial direction of the electric pump, the second part is located between the first part and the third part, the first part is in transmission connection with the pump rotor, and the stator assembly is located between the first part and the third part. The second part is fixedly connected or in transmission connection with the motor rotor, the retainer is directly or indirectly supported on the third part, the stator assembly is fixedly connected with the motor shell, and the retainer is fixedly connected with the motor shell.

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 shaft, a stator assembly, and a motor rotor. One end of the shaft is fixedly connected to the pump rotor, and the other end of the shaft is fixedly connected to the motor rotor. During the operation of the electric pump, the motor rotor is prone to shaking, which increases the noise of 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, a pump shaft, a pump rotor, a stator assembly, a motor rotor, and a cage. The pump shaft includes a first part, a second part, and a third part. In the axial direction of the electric pump, the second part is located between the first part and the third part. The first part is drivenly connected to the pump rotor, and the second part is fixedly connected to or drivenly connected to the motor rotor. A first support part of the cage directly or indirectly supports the third part. The stator assembly is fixedly connected to the motor housing, and the cage is fixedly connected to the motor housing.

[0006] In the above technical solution, the pump shaft includes a first part, a second part, and a third part. In the axial direction of the electric pump, the second part is located between the first and third parts. The first part is drivenly connected to the pump rotor, and the second part is fixedly or drivenly connected to the motor rotor. The first support part of the cage directly or indirectly supports the third part. The stator assembly is fixedly connected to the motor housing, and the cage is fixedly connected to the motor housing. This reduces the dimensional chain transmission, which helps to reduce the coaxiality tolerance between the cage and the stator assembly, thereby helping to reduce the coaxiality tolerance between the pump shaft and the stator assembly, and further helping to reduce the coaxiality accuracy tolerance between the motor rotor and the stator assembly, thus helping to reduce the wobbling of the motor rotor, and further helping to reduce the noise of the electric pump. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of an embodiment of the electric pump of this application;

[0008] Figure 2 for Figure 1 A schematic diagram of a cross-section of the electric pump is shown.

[0009] Figure 3 for Figure 1 Another cross-sectional schematic diagram of the electric pump shown;

[0010] Figure 4 for Figure 2 or Figure 3 A schematic diagram of the fit between the cage and the pump shaft;

[0011] Figure 5 for Figure 4 A schematic diagram of the cage from one perspective;

[0012] Figure 6 for Figure 5 A schematic cross-sectional view of the cage shown;

[0013] Figure 7 This is a schematic diagram of another embodiment of the electric pump of this application;

[0014] Figure 8 for Figure 7 A schematic diagram of a cross-section of the electric pump is shown.

[0015] Figure 9 for Figure 8 An enlarged schematic diagram of part A in the middle;

[0016] Figure 10 A schematic diagram showing the assembly of the electronic control components, stator assembly, pump shaft, cage, isolator, and pins;

[0017] Figure 11 for Figure 10 Schematic diagram of section AA;

[0018] Figure 12 for Figure 8 A schematic diagram of the cage.

[0019] Reference numerals: 1. Pump housing; 11. Motor housing; 111. First inner circumference; 112. Second inner circumference; 113. Positioning part; 114. Third inner circumference; 115. Second support part; 116. Partition; 12. Bottom cover; 121. First receiving groove; 13. Isolator; 131. First inner wall; 132. Second inner wall; 133. Second receiving groove; 14. Pump cover; 141. Oil inlet; 142. Oil outlet; 2. Cage; 21. Main body; 211. First support part; 2111. First surface; 2112. Second surface; 212. Connecting part; 213. First fixing part; 2131. Third surface; 2132. Fourth surface Surface; 215, Groove; 22, Injection part; 221, Fixing post; 23, Hollowed-out part; 3, Pin; 31, First electrical connection part; 32, Second fixing part; 33, Second electrical connection part; 4, Pump rotor; 41, Outer rotor; 42, Inner rotor; 5, Stator assembly; 51, Stator core; 52, Winding; 53, Insulation part; 6, Motor rotor; 7, Pump shaft; 71, First part; 711, Pump rotor fixing part; 712, Mating part; 72, Second part; 73, Third part; 8, Electrical control assembly; 81, Circuit board; 811, First surface; 82, Sensor; 9, Seal; 10, Magnetic element; 20, Pump chamber; 30, Motor chamber; 40, Electrical control chamber. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, further descriptions are provided 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 solutions without creative effort.

[0021] 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.

[0022] Please refer to Figures 1 to 6 , Figure 1This is a schematic diagram of an embodiment of an electric pump. The electric pump includes a pump housing 1, which includes a pump cover 14, a motor housing 11, and a bottom cover 12. The pump cover 14 has an oil inlet 141 and an oil outlet 142. The oil inlet 141 is used for the inflow of the working medium, and the oil outlet 142 is used for the outflow of the working medium. The pump cover 14 is fixedly connected to the motor housing 11, for example, by screws or bolts. Of course, the pump cover 14 and the motor housing 11 can also be connected by other connection methods, such as plug-in or snap-fit. The motor housing 11 is fixedly connected to the bottom cover 12, for example, by screws or bolts, which facilitates the 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 stator assembly 5 is located radially outside the motor rotor 6. The pump shaft 7 is drively connected to the motor rotor 6. The electric pump has a pump chamber 20 and a motor chamber 30, which are connected. The pump rotor 4 (or at least a portion of the pump rotor 4) is located in the pump chamber 20, and at least a portion of the electrical control assembly 8, the motor rotor 6 (or at least a portion of the motor rotor 6), at least a portion of the pump shaft 7, and the stator assembly 5 (or at least a portion of the stator assembly 5) are located in the motor chamber 30. The electrical control assembly 8 and the stator assembly 5 are located in the same chamber, which can reduce the axial dimension of the electric pump, making it compact and thus reducing the production cost of the electric pump. It should be noted that the axial direction of the electric pump here and below refers to the axial extension direction of the pump shaft, and the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump. "Radially outside" refers to the direction away from the central axis of the pump shaft 7, and "radially inside" refers to the direction closer to the central axis of the pump shaft 7.

[0023] Please refer to Figures 7 to 12 , Figure 7This is a schematic diagram of another embodiment of the electric pump. The electric pump includes a pump housing 1, which includes a pump cover 14, a motor housing 11, a bottom cover 12, and an isolation member 13. The pump cover 14 has an oil inlet 141 and an oil outlet 142. The oil inlet 141 is used for the inflow of the working medium, and the oil outlet 142 is used for the outflow of the working medium. The pump cover 14 is fixedly connected to the motor housing 11, the motor housing 11 is fixedly connected to the isolation member 13, and the bottom cover 12 is fixedly connected to the isolation member 13. For example, the motor housing 11, the bottom cover 12, and the isolation member 13 are connected by screws, which facilitates the 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 stator assembly 5 is electrically connected to the electrical control assembly 8 and is located radially outside the motor rotor 6. The pump shaft 7 is drively connected to the motor rotor 6. The electric pump has a pump chamber 20, a motor chamber 30, and an electrical control chamber 40. The pump chamber 20 communicates with the motor chamber 30, but the motor chamber 30 and the electrical control chamber 40 are not communicated. The pump rotor 4 (or at least a portion of the pump rotor 4) is located in the pump chamber 20. The motor rotor 6 (or at least a portion of the motor rotor 6), at least a portion of the pump shaft 7, and the motor rotor 6 are connected to the motor rotor 6. The stator assembly 5 (or at least part of the stator assembly 5) is located in the motor cavity 30, and the electronic control assembly 8 is located in the electronic control cavity 40. When the electric pump is working, the pump cavity 20 can contain the working medium, which can flow into the motor cavity 30 and contact the stator assembly 5, thereby facilitating heat dissipation of the stator assembly 5. In addition, the motor cavity 30 and the electronic control cavity 40 are not connected, and the working medium in the motor cavity 30 cannot flow into the electronic control cavity 40, thereby helping to prevent the electronic control assembly 8 from contacting the working medium and causing the working medium to corrode the electronic components of the electronic control assembly 8.

[0024] Please refer to Figures 1 to 12 The stator assembly 5 includes a stator core 51, windings 52, and insulation 53. The stator core 51 is fixedly connected to the insulation 53, which supports the windings 52. When the electric pump is working, the electronic control assembly 8 controls the current in the windings 52 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, and the motor rotor 6 can directly or indirectly drive the pump rotor 4 to rotate. In this embodiment, the pump shaft 7 is drivenly connected to the pump rotor 4 and the motor rotor 6. Specifically, the pump shaft 7 includes a first part 71 and a second part 72. The first part 71 is drivenly connected to the inner rotor 42, and the second part 72 is drivenly connected to the motor rotor 6. The motor rotor 6 drives the inner rotor 42 to rotate through the pump shaft 7, thereby realizing the rotation of the pump rotor 4. Please refer to... Figure 2 or Figure 8The outer rotor 41 is located on the outer periphery of the inner rotor 42, and the outer rotor 41 and the inner rotor 42 are internally meshed. In other embodiments, the outer rotor 41 and the inner rotor 42 can also be externally meshed, in which case the outer rotor 41 and the inner rotor 42 are arranged side by side. In this embodiment, the central axis of the outer rotor 41 is offset from the central axis of the inner rotor 42, that is, there is a certain eccentricity between the central axis of the outer rotor 41 and the central axis of the inner rotor 42. When the inner rotor 42 rotates, at least a portion of the external teeth of the inner rotor 42 meshes with at least a portion of the internal teeth of the outer rotor 41, thereby enabling the inner rotor 42 to drive the outer rotor 41 to rotate.

[0025] Please refer to Figures 1 to 12 The electric pump includes a cage 2, and a 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 drivenly connected to the pump rotor 4, and the second part 72 is fixedly connected to the motor rotor 6. The first support part of the cage 2 directly or indirectly supports the third part 73. The stator assembly 5 is fixedly connected to the motor housing 11, and the cage 2 is fixedly connected to the motor housing 11. If the cage 2 is fixedly connected to the stator assembly 5, the cage 2 needs to be positioned through the stator assembly 5, and the stator assembly 5 is positioned through the motor housing 11, resulting in a large dimensional chain transmission. In addition, the cage 2 is generally fixedly connected to the insulating part 53 of the stator assembly 5, and the insulating part 53 is made of plastic. Due to the thermal expansion and contraction characteristics of plastic, the positioning effect may be poor when the cage 2 is positioned through the stator assembly 5. In this application, both the stator assembly 5 and the cage 2 are fixedly connected to the motor housing 11, which reduces the dimensional chain transmission and helps to reduce the coaxiality tolerance between the cage 2 and the stator assembly 5. This, in turn, helps to reduce the coaxiality tolerance between the pump shaft 7 and the stator assembly 5, and further helps to reduce the coaxiality accuracy tolerance between the motor rotor 6 and the stator assembly 5. This, in turn, helps to reduce the wobbling of the motor rotor 6, and further helps to reduce the noise of the electric pump.

[0026] Please refer to Figures 2 to 6The retainer 2 includes a main body 21, which includes a first support 211 and a first fixing part 213. The first support 211 is a metal part, and the third part 73 is directly or indirectly supported by the first support 211. The first fixing part 213 is fixedly connected to the motor housing 11. When the electric pump is running, there will be relative friction between the pump shaft 7 and the first support 211. If the first support 211 is a plastic part, its wear resistance is relatively poor, and the friction between the pump shaft 7 and the first support 211 will generate plastic shavings. This will cause the working medium in the motor cavity 30 to contain more impurities when the electric pump is working. If the impurities flow into the pump cavity 20, it may cause the pump rotor 4 to jam. In this application, the first support 211 is a metal part, which has better wear resistance. In addition, when the pump shaft 7 rotates, the first support 211 is not easily deformed under force, which is beneficial for the first support 211 to support the third part 73. The main body 21 includes a connecting part 212. One end of the connecting part 212 is fixedly connected to the first fixing part 213, and the other end of the connecting part 212 is fixedly connected to the first support part 211. The diameter of the inner side wall of the first fixing part 213 is larger than the diameter of the outer side wall of the first support part 211.

[0027] Please refer to Figure 2 The stator assembly 5 and the cage 2 are located in the motor cavity 30. The wall of the motor cavity 30 includes a first inner peripheral portion 111, a second inner peripheral portion 112, and a positioning portion 113; or the inner peripheral wall of the motor housing 11 includes a first inner peripheral portion 111, a second inner peripheral portion 112, and a positioning portion 113. The positioning portion 113 extends from the first inner peripheral portion 111 to the second inner peripheral portion 112. The first inner peripheral portion 111 is interference-fitted with the outer wall of the stator assembly 5. Further, the first inner peripheral portion 111 is interference-fitted with the outer wall of the stator core 51. The second inner peripheral portion 112 is interference-fitted with the outer wall of the first fixing portion 213. The inner diameter of the first inner peripheral portion 111 is smaller than the inner diameter of the second inner peripheral portion 112. When assembling the cage 2, the cage 2 moves along the second inner peripheral portion 112 toward the stator assembly 5. The positioning portion 113 limits the cage 2, which facilitates the installation of the cage 2 into place. Please refer to... Figure 2 and Figure 6 The first support portion 211 includes a first surface 2111 and a second surface 2112. Along the axial direction of the electric pump, the first surface 2111 is farther away from the stator assembly 5 relative to the second surface 2112. The first fixing portion 213 includes a third surface 2131 and a fourth surface 2132. Along the axial direction of the electric pump, the third surface 2131 is farther away from the stator assembly 5 relative to the fourth surface 2132, and the third surface 2131 is closer to the stator assembly 5 relative to the first surface 2111. This is beneficial for miniaturizing the electric pump in the axial direction. At the same time, it further reduces the axial length of the pump shaft 7, which in turn helps to reduce the coaxiality tolerance between the pump shaft 7 and the stator assembly 5, reduce the shaking of the motor rotor 6, and thus help to reduce the noise of the electric pump.

[0028] Please refer to Figures 2 to 6 The retainer 2 includes an injection-molded portion 22, which is fixedly connected to a first fixing portion 213. The electric pump includes a pin 3 and an electrical control assembly 8. The pin 3 includes a first electrical connection portion 31, a second fixing portion 32, and a second electrical connection portion 33. The first electrical connection portion 31 is located on one side of the second fixing portion 32, and the second electrical connection portion 33 is located on the other side of the second fixing portion 32. The first electrical connection portion 31 is electrically connected to the stator assembly 5, and the second electrical connection portion 33 is electrically connected to the electrical control assembly 8. The second fixing portion 32 is embedded in the injection-molded portion 22. If the retainer 2 is a plastic part, the pin 3 is partially embedded in the retainer 2, resulting in a larger amount of plastic material used in the retainer 2 and a larger deformation amount, which leads to a larger positional accuracy of the pin 3. In this application, the injection-molded portion 22 of the retainer 2 uses relatively less plastic material, the deformation amount of the injection-molded portion 22 is smaller, and the positional accuracy of the pin 3 is smaller, which is beneficial to improving the electrical connection accuracy between the pin 3 and the stator assembly 5, and between the pin 3 and the electrical control assembly 8. When manufacturing the retainer 2, the relative positions of the pin 3 and the main body 21 are first fixed, and then injection molding is performed to form the injection molded part 22, so that the pin 3 and the injection molded part 22 are an integral structure, and the injection molded part 22 and the main body 21 are an integral structure. The injection molded part 22 includes at least two fixing posts 221. The electronic control assembly 8 includes a circuit board 81 and a sensor 82. The electric pump includes a magnetic element 10. The circuit board 81 includes a first surface 811 facing the magnetic element 10. At least part of the sensor 82 is located on the first surface 811. The fixing posts 221 are fixedly connected to the circuit board 81. The magnetic element 10 is fixedly connected to the third part 73. The magnetic element 10 is within the sensing range of the sensor 82. The retainer 2 is fixedly connected to the circuit board 81 through the fixing posts 221. The electronic control assembly 8 can be set close to the retainer 2, which is beneficial to achieve a compact electric pump structure. In addition, reducing the axial length of the pump shaft 7 is beneficial to reducing the coaxiality tolerance of the pump shaft 7 relative to the stator assembly 5 and reducing the shaking of the motor rotor 6. In this embodiment, there are 3 fixing posts 221. The fixing posts 221 are not uniformly distributed along the circumference of the retainer 2. The fixing posts 221 are fixedly connected to the circuit board 81, so that there is a unique installation direction during installation, which helps to prevent the circuit board 81 from being installed incorrectly.

[0029] Please refer to Figure 3The inner wall of the motor housing 11 includes a third inner circumferential portion 114, the inner diameter of which is larger than the inner diameter of the second inner circumferential portion 112. The electric pump includes a seal 9 that contacts the third inner circumferential portion 114. If the inner diameter of the third inner circumferential portion 114 is equal to the inner diameter of the second inner circumferential portion 112, the retainer 2 may scratch the third inner circumferential portion 114 during assembly. After the seal 9 is installed, leakage may occur between the third inner circumferential portion 114 and the seal 9, potentially causing a micro-leakage in the electric pump. In this application, the inner diameter of the third inner circumferential portion 114 is larger than the inner diameter of the second inner circumferential portion 112. When the retainer 2 is assembled, there is a gap between the retainer 2 and the third inner circumferential portion 114, which helps to ensure the sealing performance between the seal 9 and the third inner circumferential portion 114, thereby helping to ensure the sealing performance of the electric pump. The bottom cover 12 is fixedly connected to the motor housing 11. The bottom cover 12 has a first receiving groove 121. The sealing element 9 is located in the first receiving groove 121. The cavity wall of the motor cavity 30 includes at least a portion of the inner wall of the bottom cover 12 and the inner wall of the motor housing 11. The inner wall of the motor housing 11 includes the inner peripheral wall of the motor housing. When the electric pump is working, the motor cavity 30 can have working medium. By providing the sealing element 9 in the first receiving groove 121, it is beneficial to prevent the working medium in the motor cavity 30 from leaking out.

[0030] Please refer to Figures 7 to 12The electric pump includes a bottom cover 12 and an isolator 13. The bottom cover 12 is fixedly connected to the isolator 13, and the isolator 13 is fixedly connected to the motor housing 11. The cavity wall of the motor cavity 30 includes at least a portion of the inner wall of the motor housing 11 and a first inner wall of the isolator 13. The cavity wall of the electrical control cavity 40 includes a second inner wall 132 of the isolator 13 and at least a portion of the inner wall of the bottom cover 12. The isolator 13 has a second receiving groove 133, and a seal 9 is located in the second receiving groove 133. When the electric pump is working, the motor cavity 30 can contain working medium. By providing the seal 9 in the second receiving groove 133, it is beneficial to prevent the working medium in the motor cavity 30 from leaking into the electrical control cavity 40. In the axial direction of the electric pump, there is a gap D1 between the retainer 2 and the stator assembly 5, and a gap D2 between the retainer 2 and the isolator 13. The first fixing part 213 extends from the first support part 211 toward the motor housing 11. In the axial direction of the electric pump, the height H1 of the first fixing part 213 is less than or equal to the height H2 of the first support part 211. When assembling the stator assembly 5, the cage 2, and the isolator 13, a certain gap is set between the cage 2 and the stator assembly 5, and between the cage 2 and the isolator 13, which helps to avoid assembly interference between the stator assembly 5, the cage 2, and the isolator 13. Under the premise that the cage needs to maintain a certain gap with the stator assembly and the isolator, since the first support part 211 indirectly or directly supports the pump shaft 7, the height of the first fixing part 213 is conducive to achieving a compact electric pump structure. In addition, reducing the axial length of the pump shaft 7 helps to reduce the coaxiality tolerance of the pump shaft 7 relative to the stator assembly 5 and reduce the shaking of the motor rotor 6. The first fixing part 213 includes a third surface 2131 and a fourth surface 2132. The cage 2 includes a hollow part 23 that penetrates the third surface 2131 and the fourth surface 2132. Along the axial direction of the electric pump, the third surface 2131 is farther away from the stator assembly 5 relative to the fourth surface 2132. The electric pump includes a pin 3, which includes a first electrical connection part 31 that extends from the second fixing part 32 toward the stator assembly 5. The first electrical connection part 31 is electrically connected to the stator assembly 5, and at least a portion of the first electrical connection part 31 is located in the hollow part 23. In this way, while ensuring the structural strength of the cage 2, it is beneficial to achieve a lightweight design of the electric pump. In one embodiment, please refer to... Figure 11 The retainer 2 has at least one groove 215 that is recessed from the fourth surface 2132 toward the third surface 2131, which is beneficial for achieving a lightweight design of the electric pump. In other embodiments, the groove 215 is recessed from the third surface 2131 toward the fourth surface 2132.

[0031] Please refer to Figures 1 to 12The electric pump includes a second support portion 115, which is integrally formed with the motor housing 11. The first part 71 includes a pump rotor fixing portion 711 and a mating portion 712. Along the axial direction of the electric pump, the pump rotor fixing portion 711 is located on one side of the mating portion 712, and the second part 72 is located on the other side of the mating portion 712. The pump rotor fixing portion 711 is fixedly connected to the pump rotor 4, and the mating portion 712 is directly or indirectly supported by the second support portion 115. It can be understood that along the axial direction of the electric pump, the mating portion 712 is located between the pump rotor 4 and the mounting portion, the pump rotor fixing portion 711 is fixedly connected to the pump rotor 4, and the mating portion 712 is supported by the second support portion 115. Specifically, the motor housing 11 includes a partition portion 116, with the pump chamber 20 and motor chamber 30 located on opposite sides of the partition portion 116. The second support portion 115 is integrally formed with the partition portion 116 and is an annular protrusion extending from the partition portion 116 into the motor chamber 30. Specifically, the mating part 712 is directly supported by the second support part 115, and the mating part 712 and the second support part 115 slide through each other. Alternatively, the mating part 712 can be indirectly supported by the second support part 115 via a second bearing; specifically, the outer peripheral wall of the second bearing contacts the inner peripheral wall of the second support part 115. In this embodiment, the mating part 712 and the second support part 115 are in direct contact. The mating part 712 and the second support part 115 slide through each other. The second bearing can be either a rolling bearing or a sliding bearing. For low- and medium-speed electric pumps, using a sliding bearing can meet the requirements for wear and rotational accuracy, while also reducing costs. For high-speed electric pumps, wear, rotational accuracy, and the bearing's load-bearing capacity are key factors in bearing selection; in this case, rolling bearings are preferred. This arrangement of the second support part 115 and the first support part 211 helps reduce the wobbling of the pump shaft 7, thereby reducing the noise of the electric pump.

[0032] 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 (11), a pump shaft (7), a pump rotor (4), a stator assembly (5), a motor rotor (6), and a cage (2). 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 drivenly connected to the pump rotor (4), and the second part (72) is fixedly connected or drivenly connected to the motor rotor (6). The first support part (211) of the cage (2) is directly or indirectly supported by the third part (73). The stator assembly (5) is fixedly connected to the motor housing (11), and the cage (2) is fixedly connected to the motor housing (11).

2. The electric pump according to claim 1, characterized in that, The retainer (2) includes a main body (21), which includes a first support (211) and a first fixing part (213). The first support (211) is a metal part, and the first fixing part (213) is fixedly connected to the motor housing (11).

3. The electric pump according to claim 2, characterized in that, The inner peripheral wall of the motor housing (11) includes a first inner peripheral part (111), a second inner peripheral part (112), and a positioning part (113). The positioning part (113) extends from the first inner peripheral part (111) to the second inner peripheral part (112). The first inner peripheral part (111) is interference-fitted with the outer side wall of the stator assembly (5), and the second inner peripheral part (112) is interference-fitted with the outer side wall of the first fixing part (213). The inner diameter of the first inner peripheral part (111) is smaller than the inner diameter of the second inner peripheral part (112).

4. The electric pump according to claim 2, characterized in that, The first support portion (211) includes a first surface (2111) and a second surface (2112). Along the axial direction of the electric pump, the first surface (2111) is away from the stator assembly (5) relative to the second surface (2112). The first fixing portion (213) includes a third surface (2131) and a fourth surface (2132). Along the axial direction of the electric pump, the third surface (2131) is away from the stator assembly (5) relative to the fourth surface (2132), and the third surface (2131) is away from the stator assembly (5) relative to the first surface (2111).

5. The electric pump according to claim 3, characterized in that, The first support portion (211) includes a first surface (2111) and a second surface (2112). Along the axial direction of the electric pump, the first surface (2111) is away from the stator assembly (5) relative to the second surface (2112). The first fixing portion (213) includes a third surface (2131) and a fourth surface (2132). Along the axial direction of the electric pump, the third surface (2131) is away from the stator assembly (5) relative to the fourth surface (2132), and the third surface (2131) is away from the stator assembly (5) relative to the first surface (2111).

6. The electric pump according to any one of claims 2-5, characterized in that, The retainer (2) includes an injection molding part (22), which is fixedly connected to the first fixing part (213). The electric pump includes a pin (3) and an electric control assembly (8). The pin (3) includes a first electrical connection part (31), a second fixing part (32), and a second electrical connection part (33). The first electrical connection part (31) is disposed on one side of the second fixing part (32), and the second electrical connection part (33) is disposed on the other side of the second fixing part (32). The first electrical connection part (31) is electrically connected to the stator assembly (5), and the second electrical connection part (33) is electrically connected to the electric control assembly (8). The second fixing part (32) is embedded in the injection molding part (22).

7. The electric pump according to claim 6, characterized in that, The injection molding part (22) includes a fixing post (221), the electronic control assembly (8) includes a circuit board (81) and a sensor (82), the electric pump includes a magnetic element (10), the circuit board (81) includes a first surface (811) facing the magnetic element (10), at least part of the sensor (82) is located on the first surface (811), the fixing post (221) is fixedly connected to the circuit board (81), the magnetic element (10) is fixedly connected to the third part (73), and the magnetic element (10) is within the sensing range of the sensor (82).

8. The electric pump according to claim 2 or 3, characterized in that, The electric pump includes an isolator (13), and in the axial direction of the electric pump, there is a gap (D1) between the cage (2) and the stator assembly (5), and a gap (D2) between the cage (2) and the isolator (13). The first fixing part (213) extends from the first support part (211) toward the motor housing (11), and in the axial direction of the electric pump, the height (H1) of the first fixing part (213) is less than or equal to the height (H2) of the first support part (211).

9. The electric pump according to any one of claims 1-5, characterized in that, The electric pump includes a second support part (115), which is integral with the motor housing (11). The first part (71) includes a pump rotor fixing part (711) and a mating part (712). Along the axial direction of the electric pump, the pump rotor fixing part (711) is disposed on one side of the mating part (712), and the second part (72) is disposed on the other side of the mating part (712). The pump rotor fixing part (711) is fixedly connected to the pump rotor (4), and the mating part (712) is directly or indirectly supported by the second support part (115).

10. The electric pump according to claim 6, characterized in that, The electric pump includes a second support part (115), which is integral with the motor housing (11). The first part (71) includes a pump rotor fixing part (711) and a mating part (712). Along the axial direction of the electric pump, the pump rotor fixing part (711) is disposed on one side of the mating part (712), and the second part (72) is disposed on the other side of the mating part (712). The pump rotor fixing part (711) is fixedly connected to the pump rotor (4), and the mating part (712) is directly or indirectly supported by the second support part (115).

11. The electric pump according to claim 7, characterized in that, The electric pump includes a second support part (115), which is integral with the motor housing (11). The first part (71) includes a pump rotor fixing part (711) and a mating part (712). Along the axial direction of the electric pump, the pump rotor fixing part (711) is disposed on one side of the mating part (712), and the second part (72) is disposed on the other side of the mating part (712). The pump rotor fixing part (711) is fixedly connected to the pump rotor (4), and the mating part (712) is directly or indirectly supported by the second support part (115).

12. The electric pump according to claim 3, characterized in that, The inner wall of the motor housing (11) includes a third inner circumferential portion (114), the inner diameter of which is larger than the inner diameter of the second inner circumferential portion (112). The electric pump includes a seal (9) that contacts the third inner circumferential portion (114). The electric pump includes an isolator (13) and a bottom cover (12). The isolator (13) is fixedly connected to the motor housing (11), and the isolator (13) is fixedly connected to the bottom cover (12). In the radial direction of the electric pump, the seal (9) is located between the isolator (13) and the motor housing (11). Alternatively, the electric pump may include a bottom cover (12) which is fixedly connected to the motor housing (11), and the seal (9) is located between the bottom cover (12) and the motor housing (11).

13. The electric pump according to claim 8, characterized in that, The first fixing part (213) includes a third surface (2131) and a fourth surface (2132). The retainer (2) includes a hollow part (23) that penetrates the third surface (2131) and the fourth surface (2132). The electric pump includes a pin (3) that includes a first electrical connection part (31) that is electrically connected to the stator assembly (5). At least a portion of the first electrical connection part (31) is located in the hollow part (23).

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