An electric pump

Abstract

An embodiment of the present application discloses an electric pump, the electric pump comprises a control unit assembly, an electrical connector, a sealing part, a motor housing and an injection molded part, the injection molded part is formed by injection molding with at least part of the electrical connector as an insert, the electrical connector comprises a main body and a connecting part, at least part of the connecting part is electrically connected to the control unit assembly, the main body comprises a first main body, the injection molded part has an end face, the first main body protrudes from the end face, the sealing part covers at least part of the outer surface and at least part of the end face of the first main body, and in the axial direction of the electric pump, at the same length, the surface area of ​​the first main body is greater than the surface area of ​​the connecting part. The present application has the characteristic of improving the sealing performance of the electric pump.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to an electric pump. Background Art

[0002] The electric pump provides a power source for the vehicle cooling system and / or lubrication system. The electric pump includes a motor housing and an injection molded part. The motor housing and the injection molded part are fixedly connected. An inner cavity is formed between the motor housing and the injection molded part. When the electric pump is working, there is a working medium in the inner cavity, and the working medium in the inner cavity is prone to leakage. It is currently found that the reason for the leakage of the working medium in the inner cavity is that the injection molded part is deformed due to the influence of temperature, which increases the assembly tolerance between the motor housing and the injection molded part. Utility Model Content

[0003] The purpose of the present application is to provide an electric pump, which is helpful in preventing leakage of working medium, thereby helping to improve the sealing effect of the electric pump.

[0004] To achieve the above purpose, one embodiment of the present application adopts the following technical solution:

[0005] An electric pump comprises a control component, an electrical connector, a sealing part, a motor housing and an injection molded part, wherein the injection molded part is formed by injection molding with at least a portion of the electrical connector as an insert, the electrical connector comprises a main body and a connecting part, at least a portion of the connecting part is electrically connected to the control component, the main body comprises a first main body, the injection molded part has an end face, the first main body protrudes from the end face, the sealing part covers at least a portion of the outer surface and at least a portion of the end face of the first main body, and in the axial direction of the electric pump, at the same length, the surface area of ​​the first main body is greater than the surface area of ​​the connecting part.

[0006] In the above technical solution, at least part of the electrical connector is used as an insert injection molding to form an injection molded part, the main body includes a first main body, the injection molded part has an end face, the first main body protrudes from the end face, and the sealing part covers at least part of the outer surface and at least part of the end face of the first main body. In the axial direction of the electric pump, at the same length, the surface area of ​​the first main body is greater than the surface area of ​​the connecting part. When at least part of the electrical connector is used as an insert injection molding to form the injection molded part, the difference in materials between the electrical connector and the injection molded part limits the bonding force between the two. The gap generated at the connection between the electrical connector and the injection molded part due to the limited bonding force can be covered by the sealing part, which is beneficial to preventing the working medium from leaking from the gap when the electric pump is working; the surface area of ​​the first main body is relatively large, which is beneficial to increase the contact area between the sealing part and the first main body, thereby facilitating the bonding force between the sealing part and the first main body, and the seal is not easy to fail, thereby facilitating improving the sealing effect of the electric pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1is a schematic diagram of an electric pump according to an embodiment of the present application;

[0008] Figure 2 yes Figure 1 A schematic cross-sectional view of the electric pump shown;

[0009] Figure 3 yes Figure 1 A schematic diagram of the connection between the injection molded part and the electrical connector from a first perspective;

[0010] Figure 4 yes Figure 1 A schematic diagram of a second viewing angle of the connection between the injection molded part and the electrical connector;

[0011] Figure 5 yes Figure 4 A schematic diagram of the first embodiment of the section AA;

[0012] Figure 6 yes Figure 4 A schematic diagram of a second embodiment of section AA;

[0013] Figure 7 is a schematic diagram of an electric pump according to another embodiment of the present application;

[0014] Figure 8 yes Figure 7 A schematic diagram of a cross section of the electric pump shown;

[0015] Fig. 9 yes Figure 7 A schematic diagram of the connection between the injection molded part and the electrical connector from a first perspective;

[0016] Fig.10 yes Figure 7 A schematic diagram of a second viewing angle of the connection between the injection molded part and the electrical connector;

[0017] Fig.11 yes Fig.10 A schematic diagram of the first embodiment of the cross section BB;

[0018] Fig.12 yes Fig.10 A schematic diagram of the second embodiment of the cross section BB;

[0019] Fig.13 is a schematic diagram of a first embodiment of an electrical connector from a first viewing angle;

[0020] Fig.14 is a schematic diagram of a first embodiment of an electrical connector from a second viewing angle;

[0021] Fig.15 A schematic diagram of a second embodiment of an electrical connector;

[0022] Fig.16 yes Fig.15 Schematic diagram of the CC section;

[0023] Fig.17 is a schematic diagram of a third embodiment of an electrical connector.

[0024] Figure numerals: 11, housing; 111, pump cover; 1111, oil inlet; 1112, oil outlet; 112, motor housing; 113, injection molded part; 1131, plug interface; 1132, first inner wall; 1133, second inner wall; 1134, end face; 114, bottom cover; 12, stator assembly; 121, stator core; 122, insulation; 123, winding; 13, motor rotor assembly; 131, motor rotor; 132, shaft; 14, electrical connector; 141, main body; 1411, first Two main bodies; 1411a, first knurling; 1411b, second knurling; 1412, first main body; 142, connecting part; 1421, first connecting part; 1422, second connecting part; 141a, first surface; 141b, second surface; 141c, crest part; 141d, trough part; 141e, transition part; 15, control unit assembly; 16, pump rotor; 161, outer rotor; 162, inner rotor; 17, pump rotor cavity; 18, motor cavity; 19, sealing part; 20, electronic control cavity. DETAILED DESCRIPTION

[0025] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0026] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0027] The electric pump can be applied to the automobile lubrication system and / or cooling system, and can provide the working medium in the automobile lubrication system and / or cooling system with the circulating power of the flow, and the automobile lubrication system and / or cooling system can provide the transmission system with lubricating oil and / or cooling oil. In the present application, "A and B are fixedly connected" means that there is no relative displacement between A and B after the connection, for example, A and B are fixed by welding; "A and B are limitedly connected" means that A limits B to move in a certain direction, or B limits A to move in a certain direction.

[0028] Please refer to Figures 1 to 17As shown, the electric pump includes a housing 11, a motor rotor assembly 13, a stator assembly 12, a pump rotor 16, and a control unit assembly 15. The stator assembly 12 is electrically connected to the control unit assembly 15. The stator assembly 12 includes a stator core 121, an insulating portion 122, and a winding 123. The insulating portion 122 is coated on at least the surface of the stator core 121, and the winding 123 is wound around the insulating portion 122. The motor rotor assembly 13 includes a motor rotor 131 and a shaft 132. The motor rotor 131 is fixedly connected or positionally connected to the shaft 132. The motor rotor 131 is located on the circumferential outer side of the shaft 132. The motor rotor assembly 13 is transmission-connected to the pump rotor 16. As an implementation method, part of the shaft 132 is fixed to the pump rotor 16. Specifically, the pump rotor 16 and part of the shaft 132 are interference-fitted. The pump rotor 16 includes an inner rotor 162 and an outer rotor 161. The inner rotor 162 includes inner teeth, and the outer rotor 161 includes a plurality of outer teeth. The inner rotor 162 is located at the outer periphery of the outer rotor 161. The inner rotor 162 and the outer rotor 161 are internally meshed. In other embodiments, the inner rotor 162 and the outer rotor 161 may also be externally meshed.

[0029] Please refer to Figures 1 to 17The housing 11 includes a pump cover 111, a motor housing 112 and an injection molded part 113. The pump cover 111 has an oil inlet 1111 and an oil outlet 1112. The oil inlet 1111 is used for the inflow of the working medium, and the oil outlet 1112 is used for the outflow of the working medium. One end of the pump cover 111 is fixedly connected to one end of the motor housing 112. Specifically, as an implementation method, one end of the pump cover 111 is fixedly connected to one end of the motor housing 112 by screws. The motor housing 112 is fixedly connected to the injection molded part 113. The electric pump includes an electrical connector 14, which is electrically connected to the control unit assembly 15. The electrical connector 14 is an integral structure with the injection molded part 113. Specifically, the injection molded part 113 is at least partially formed by injection molding with the electrical connector 14 as an insert. The electrical connector 14 includes a main body 141 and a connecting part 142, at least one end of the connecting part 142 is electrically connected to the control part assembly 15, the main body 141 includes a first main body 1412, the injection molded part 113 has an end face 1134, the first main body 1412 protrudes from the end face 1134, the electric pump includes a sealing part 19, the sealing part 19 covers at least a portion of the end face 1134 and at least a portion of the outer surface of the first main body 1412, when at least a portion of the electrical connector 14 is used as an insert to form the injection molded part 113, the difference in material between the electrical connector 14 and the injection molded part 113 limits the bonding force between the two, and the gap generated at the connection between the electrical connector 14 and the injection molded part 113 due to the limited bonding force can be covered by the sealing part 19, which is beneficial to prevent the working medium from leaking from the gap when the electric pump is working, thereby facilitating improving the sealing effect of the electric pump. In the axial direction of the electric pump, at the same length, the surface area of ​​the first main body 1412 is greater than the surface area of ​​the connecting part 142, and the sealing part 19 can have a larger contact area with the first main body 1412, which is beneficial to improve the bonding force between the sealing part 19 and the first main body 1412, and the seal is not easy to fail, which is beneficial to prevent the working medium from leaking from the gap when the electric pump is working, thereby helping to improve the sealing effect of the electric pump; further, in the axial direction of the electric pump, at the same length and in the radial direction of the electric pump, at the same width, the surface area of ​​the first main body 1412 is greater than the surface area of ​​the connecting part 142; or at the same axial length and the same radial width, the surface area of ​​the first main body 1412 is greater than the surface area of ​​the connecting part 142, where "axial" refers to the axial direction of the electric pump, and "radial" refers to the radial direction of the electric pump. Please refer to Figures 3 to 6 , Figures 9 to 17The main body 141 includes a first main body 1412 and a second main body 1411. The second main body 1411 extends from the first main body 1412 in a direction away from the stator assembly 12. At least a portion of the second main body 1411 is embedded in the injection molded part 113. Under the same length, the surface area of ​​the second main body 1411 is greater than the surface area of ​​the connecting part 142. The electrical connector 14 and the injection molded part 113 have a larger contact area, which is beneficial to increase the bonding force between the electrical connector 14 and the injection molded part 113, thereby facilitating the improvement of the sealing between the electrical connector and the injection molded part, and further facilitating the improvement of the sealing effect of the electric pump; further, in the axial direction of the electric pump, under the same length and in the radial direction of the electric pump, under the same width, the surface area of ​​the second main body 1411 is greater than the surface area of ​​the connecting part 142; or under the same axial length and the same radial width, the surface area of ​​the second main body 1411 is greater than the surface area of ​​the connecting part 142, where "axial" refers to the axial direction of the electric pump, and "radial" refers to the radial direction of the electric pump. In the axial direction of the electric pump, the length of the first main body 1412 is smaller than the length of the second main body 1411, and the injection molded part 113 can have a larger contact area with the second main body 1411, which is beneficial to increase the bonding force between the electrical connector 14 and the injection molded part 113, thereby helping to improve the sealing between the electrical connector 14 and the injection molded part 113, and further helping to improve the sealing effect of the electric pump.

[0030] In one embodiment, please refer to Figures 3 to 6 , Figures 9 to 12 and Fig.17 The outer surface of the second main body 1411 has a first knurl 1411a, which is a straight knurl or a mesh knurl. Preferably, the first knurl 1411a is a straight knurl, and the size of the straight knurl is small. The second main body 1411 can be completely wrapped by the injection molded part 113. The second main body 1411 and the injection molded part 113 have a large contact area, which is conducive to increasing the bonding force between the electrical connector 14 and the injection molded part 113, thereby facilitating the improvement of the sealing between the electrical connector 14 and the injection molded part 113. It is not easy to have a gap between the electrical connector 14 and the injection molded part 113, thereby facilitating the improvement of the sealing effect. The outer surface of the first main body 1412 has a second knurl 1411b, which is a straight knurl or a mesh knurl, which is conducive to increasing the contact area between the glue and the first main body 1412, and is conducive to improving the bonding force between the glue and the first main body 1412, and is not easy to fail in sealing.

[0031] In some embodiments, please refer to Figures 3 to 6 , Figures 9 to 12 and Figure 15 to Figure 16The main body 141 has a first surface 141a and a second surface 141b. The first surface 141a is located between adjacent second surfaces 141b. One end of the first surface 141a is connected to a second surface 141b, and the other end of the second surface 141b is connected to another second surface 141b. The first surface 141a is an arc surface, and the second surface 141b is parallel to the central axis of the electric pump, which is beneficial to increase the contact area between the main body 141 and the injection molded part 113, and the main body 141 and the glue. It is not easy to have a gap between the main body 141 and the injection molded part 113, which is beneficial to improve the sealing effect.

[0032] In some embodiments, please refer to Figures 1 to 14 The main body 141 includes a crest portion 141c, a trough portion 141d and a transition portion 141e. The transition portion 141e connects the crest portion 141c and the trough portion 141d. The extension direction of the transition portion 141e intersects with the length direction of the electrical connector 14. In the length direction of the electrical connector 14, there is a spacing between the crest portion 141c and the trough portion 141d. Compared with the main body 141, which is a straight portion, it is beneficial to increase the contact area between the main body 141 and the injection molded part 113, and the main body 141 and the glue. The main body 141 adopts a smooth transition, which increases the contact area and has a more beautiful appearance.

[0033] Please refer to Figures 1 to 12 The cured adhesive forms a sealing portion 19. The electric pump includes a stator assembly 12. The electric pump has a motor cavity 18. The stator assembly 12 is located in the motor cavity 18. The sealing portion 19 is located in the motor cavity 18. When the electric pump is working, there is a working medium in the motor cavity 18. The sealing portion 19 can prevent the working medium from entering the gap between the injection molded part 113 and the electrical connector 14 to prevent the working medium from leaking. In some embodiments, please refer to Figures 1 to 6The electric pump has a motor housing 112, an injection molded part 113 is fixedly connected to the motor housing 112, and the injection molded part 113 is fixedly connected to the other end of the motor housing 112. Specifically, as an implementation method, the injection molded part 113 is fixedly connected to the other end of the motor housing 112 by screws. The electric pump has a pump rotor cavity 17 and a motor cavity 18. The pump rotor cavity 17 is formed between the pump cover 111 and the motor housing 112. The pump rotor 16 is accommodated in the pump rotor cavity 17. The pump rotor cavity 17 is connected to the motor cavity 18. The cavity wall of the motor cavity 18 at least includes the inner wall of the injection molded part 113 and the inner wall of the motor housing 112. The stator assembly 12, the control unit assembly 15 and part of the motor rotor assembly 13 are accommodated in the motor cavity 18. The connection part 142 includes a first connection part 1421 and a second connection part 1422. The first connection part 1421 extends from the first main body 1412 toward the direction close to the stator assembly 12. The first connection part 1421 is connected to the control part assembly 15, and the second connection part 1422 can be connected to an external power supply. The control part assembly 15 and the external power supply are connected at the same time through the electrical connector 14. The structure is simple and the connection is reliable. The injection molded part 113 has a plug interface 1131. The plug interface 1131 protrudes from the outer surface of the injection molded part 113 toward the direction away from the injection molded part 113. The first connection part 1421 is located in the motor cavity 18, and the second connection part 1422 is located in the plug interface 1131. When the electric pump is working, the motor cavity 18 can have a working medium. The working medium in the motor cavity 18 can exchange heat with the heat generated by the control part assembly 15 and the electrical connector 14, which is beneficial to the heat dissipation of the control part assembly 15, and further beneficial to improving the service life of the electric pump.

[0034] In some embodiments, please refer to Figures 7 to 12The electric pump includes a motor housing 112 and a bottom cover 114. The motor housing 112 is fixedly connected to the injection molded part 113. The injection molded part 113 is fixedly connected to the bottom cover 114. The electric pump has a pump rotor cavity 17, a motor cavity 18 and an electric control cavity 20. The pump rotor cavity 17 is connected to the motor cavity 18, and the motor cavity 18 is not connected to the electric control cavity 20. The pump rotor cavity 17 is formed between the pump cover 111 and the motor housing 112, and the pump rotor 16 is accommodated in the pump rotor cavity 17; the other end of the injection molded part 113 and the motor housing 112 Fixedly connected, a motor cavity 18 is formed between the injection molded part 113 and the motor housing 112, the cavity wall of the motor cavity 18 includes at least the inner wall of the motor housing 112 and the first inner wall 1132 of the injection molded part 113, the cavity wall of the electric control cavity 20 includes at least the second inner wall 1133 of the injection molded part 113 and the inner wall of the bottom cover 114, and the electric control cavity 20 is formed between the injection molded part 113 and the bottom cover 114, the motor rotor assembly 13 and the stator assembly 12 are accommodated in the motor cavity 18, and the control unit assembly 15 is accommodated in the electric control cavity 20. The connecting portion 142 includes a first connecting portion 1421 and a second connecting portion 1422. The first connecting portion 1421 extends from the first main body portion 1412 toward the direction close to the stator assembly 12. The first connecting portion 1421 is connected to the stator assembly 12, and the second connecting portion 1422 is connected to the control portion assembly 15. The control portion assembly 15 and the external power supply are connected at the same time through the electrical connecting member 14. The structure is simple and the connection is reliable. The first connecting portion 1421 is located in the motor cavity 18, and the second connecting portion 1422 is located in the electric control cavity 20. The working medium in the motor cavity 18 can exchange heat with the heat generated by the electrical connecting member 14, which is beneficial to the heat dissipation of the electrical connecting member 14, and further beneficial to improving the service life of the electric pump.

[0035] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. An electric pump, characterized in that: The electric pump comprises a control unit component (15), an electrical connector (14), a sealing portion (19), a motor housing (112) and an injection molded part (113); the motor housing (112) is fixedly connected to the injection molded part (113); at least a portion of the injection molded part (113) is formed by injection molding with the electrical connector (14) as an insert; the electrical connector (14) comprises a main body (141) and a connecting portion (142); at least one end of the connecting portion (142) is electrically connected to the control unit component (15); 5), the main body (141) includes a first main body (1412), the injection molded part (113) has an end surface (1134), the first main body (1412) protrudes from the end surface (1134), the sealing part (19) covers at least a portion of the end surface (1134) and at least a portion of the outer surface of the first main body (1412), and in the axial direction of the electric pump, at the same length, the surface area of ​​the first main body (1412) is greater than the surface area of ​​the connecting part (142).

2. The electric pump according to claim 1, characterized in that: The main body (141) comprises a first surface (141a) and a second surface (141b), wherein the first surface (141a) is located between adjacent second surfaces (141b), one end of the first surface (141a) is connected to one second surface (141b), and the other end of the second surface (141b) is connected to another second surface (141b), the first surface (141a) is an arc surface, and the second surface (141b) is parallel to the central axis of the electric pump.

3. The electric pump according to claim 1, characterized in that: The main body (141) includes a crest portion (141c), a trough portion (141d) and a transition portion (141e), wherein the transition portion (141e) connects the crest portion (141c) and the trough portion (141d), and an extension direction of the transition portion (141e) intersects with a length direction of the electrical connector (14). In the length direction of the electrical connector (14), there is a spacing between the crest portion (141c) and the trough portion (141d).

4. The electric pump according to any one of claims 1 to 3, characterized in that: The sealing portion (19) is formed by curing the adhesive. The electric pump comprises a stator assembly (12). The electric pump has a motor cavity (18). The stator assembly (12) is located in the motor cavity (18). The sealing portion (19) is located in the motor cavity (18).

5. The electric pump according to claim 4, characterized in that: The main body portion (141) includes a second main body portion (1411), the second main body portion (1411) extending from the first main body portion (1412) in a direction away from the stator assembly (12), at least a portion of the second main body portion (1411) being embedded in the injection molded part (113), and in the axial direction of the electric pump, at the same length, the surface area of ​​the second main body portion (1411) is greater than the surface area of ​​the connecting portion (142).

6. The electric pump according to claim 5, characterized in that The outer surface of the second main body (1411) has a first knurling (1411a), and the outer surface of the first main body (1412) has a second knurling (1411b), the first knurling (1411a) is a mesh knurling or a straight knurling, and the second knurling (1411b) is a mesh knurling or a straight knurling.

7. The electric pump according to claim 4, characterized in that: The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the control portion assembly (15), and the second connecting portion (1422) can be connected to an external power source.

8. The electric pump according to claim 5, characterized in that The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the control portion assembly (15), and the second connecting portion (1422) can be connected to an external power source.

9. The electric pump according to claim 6, characterized in that: The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the control portion assembly (15), and the second connecting portion (1422) can be connected to an external power source.

10. The electric pump according to any one of claims 7 to 9, characterized in that: The cavity wall of the motor cavity (18) includes at least the inner wall of the injection molded part (113) and the inner wall of the motor housing (112), and the first connecting portion (1421) and the control portion assembly (15) are located in the motor cavity (18).

11. The electric pump according to claim 4, characterized in that The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the stator assembly (12), and the second connecting portion (1422) is connected to the control portion assembly (15).

12. The electric pump according to claim 5, characterized in that The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the stator assembly (12), and the second connecting portion (1422) is connected to the control portion assembly (15).

13. The electric pump according to claim 6, characterized in that The connecting portion (142) includes a first connecting portion (1421) and a second connecting portion (1422), wherein the first connecting portion (1421) extends from the first main body portion (1412) toward the stator assembly (12), the first connecting portion (1421) is connected to the stator assembly (12), and the second connecting portion (1422) is connected to the control portion assembly (15).

14. The electric pump according to any one of claims 11 to 13, characterized in that: The electric pump comprises a bottom cover (114), the injection molded part (113) is fixedly connected to the bottom cover (114), the electric pump has an electric control cavity (20), the electric control cavity (20) and the motor cavity (18) are not connected, the cavity wall of the motor cavity (18) at least comprises the inner wall of the motor housing (112) and the first inner wall (1132) of the injection molded part (113), the cavity wall of the electric control cavity (20) at least comprises the second inner wall (1133) of the injection molded part (113) and the inner wall of the bottom cover (114), the first connecting portion (1421) is located in the motor cavity (18), and the control portion assembly (15) and the second connecting portion (1422) are located in the electric control cavity (20).

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