Electric pump

Abstract

The utility model discloses an electric pump, the electric pump comprises a motor rotor, a shaft and a detection unit, the shaft and the motor rotor are fixedly connected or in limited connection, the shaft comprises a mounting part, the detection unit comprises a detection part, at least part of the detection part is located in a mounting cavity of the mounting part, the mounting part comprises a body part and a pressing part, and the pressing part is located in the body part. The cavity wall of the installation cavity at least comprises the inner wall of the body part, the pressing part extends from the body part towards the center shaft close to the electric pump, the detection piece comprises a matching part, and in the axial direction of the electric pump, the matching part and the pressing part are arranged in a limiting mode. The utility model has the characteristic of improving the reliability of the electric pump.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to components of a vehicle lubrication system and / or cooling system. Background Art

[0002] The electric pump is used in the vehicle lubrication system and / or cooling system and can well meet the market requirements. The electric pump includes a shaft, a motor rotor, a detection member and a sensor. The shaft is fixedly connected to the motor rotor. The detection member and the sensor are correspondingly arranged to detect the phase of the motor rotor. The detection member is fixed on the shaft. When the electric pump is working, the detection member rotates with the shaft. The detection member is easily thrown out by the centrifugal force. After the detection member falls off, the sensor cannot sense the position of the shaft, so that the phase of the motor rotor cannot be detected, and the operation of the electric pump fails. Utility Model Content

[0003] The purpose of the present application is to provide an electric pump, which is beneficial to improving the reliability 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, the electric pump comprises a motor rotor, a shaft and a detection unit, the shaft is fixedly connected or limit-connected to the motor rotor, the shaft comprises a mounting portion, the detection unit comprises a detection piece, at least part of the detection piece is located in a mounting cavity of the mounting portion, the mounting portion comprises a main body portion and a pressure portion, the cavity wall of the mounting cavity comprises at least an inner wall of the main body portion, the pressure portion extends from the main body portion toward a central axis of the electric pump, the detection piece comprises a mating portion, and in the axial direction of the electric pump, the mating portion and the pressure portion are limit-positioned.

[0006] In the above technical solution, at least part of the detection member is located in the installation cavity of the installation part, the installation part includes a main body part and a pressure part, the cavity wall of the installation cavity includes at least the inner wall of the main body part, the pressure part extends from the main body part toward the central axis of the electric pump, the detection member includes a matching part, and in the axial direction of the electric pump, the matching part and the pressure part are limited. The main body part can limit the detection member radially, and the pressure part can limit the detection member axially. When the electric pump is working, the detection member rotates with the shaft, which is beneficial to prevent the detection member from falling off the shaft due to centrifugal force, thereby helping to improve the reliability of the electric pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the electric pump of the present application;

[0008] Figure 2 yes Figure 1 A schematic diagram of an exploded structure of an electric pump;

[0009] Figure 3 yes Figure 1 Schematic diagram of the structure of the electric pump along the XX section;

[0010] Figure 4 yes Figure 3 A three-dimensional structural schematic diagram of a first embodiment of a fixing method of a motor rotor assembly and a detection member in an electric pump;

[0011] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle BB section;

[0012] Figure 6 yes Figure 5 An enlarged schematic diagram of the first embodiment of part A;

[0013] Figure 7 yes Figure 5 An enlarged schematic diagram of the second embodiment of part A;

[0014] Figure 8 yes Figure 5 An enlarged schematic diagram of the third embodiment of part A;

[0015] Fig. 9 yes Figure 4 yes Figure 3 A three-dimensional structural schematic diagram of a second embodiment of a fixing method of a motor rotor assembly and a detection member in an electric pump;

[0016] Fig.10 yes Fig. 9 Schematic diagram of the structure of the middle BB section;

[0017] Fig.11 yes Fig.10 A magnified schematic diagram of part A;

[0018] Fig.12 yes Figure 3 A schematic diagram of another perspective of an embodiment of a fixing method of a motor rotor assembly and a detection member in an electric pump;

[0019] Fig.13 yes Figure 3 A schematic diagram of another perspective of an embodiment of a fixing method of a motor rotor assembly and a detection member in an electric pump;

[0020] Fig.14 yes Figure 3 A schematic diagram of a three-dimensional structure in one direction of a first embodiment of a connection method between a control panel assembly of an electric pump and a Hall sensor;

[0021] Fig.15 yes Figure 3A schematic diagram of the three-dimensional structure in another direction of the first implementation mode of connecting the control board assembly of the electric pump and the Hall sensor.

[0022] Figure numerals: 11, housing; 111, pump cover; 1111, oil inlet; 1112, oil outlet; 112, motor housing; 113, bottom cover; 12, stator assembly; 121, stator core; 122, insulation; 123, winding; 13, motor rotor assembly; 131, motor rotor; 132, shaft; 1321, mounting portion; 1322, first end; 1323, second end; 1324, inner hole; 1324a, side opening; 1325, main body; 1326, pressure portion; 1326a, outer side Wall; 1326b, first pressure portion; 1326d, first outer side wall; 1326c, second pressure portion; 1326e, second outer side wall; 14, detection unit; 141, detection member; 142, Hall sensor; 143, matching portion; 1431, end wall; 1432, side wall; 1432a, first side wall; 1432b, second side wall; 145, convex portion; 15, control board assembly; 151, substrate; 1511, front side; 1512, back side; 16, pump rotor; 17, first inner cavity; 18, second inner cavity. DETAILED DESCRIPTION

[0023] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0024] 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 paying creative labor. The directional words such as upper and lower involved in this article are defined by the positions of the parts relative to each other shown in the drawings. They are only 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. "A and B are fixedly connected" in this application means that there is no relative displacement between A and B after the connection, for example, A and B are welded and fixed; "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.

[0025] Please refer to Figures 1 to 3As shown, the electric pump includes a housing 11, a motor rotor assembly 13, a stator assembly 12, a pump rotor 16, a control board assembly 15 and a detection unit 14; specifically, the housing 11 includes a pump cover 111, a motor housing 112 and a bottom cover 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 electric pump has a first inner cavity 17 and a second inner cavity 18, the first inner cavity 17 is formed between the pump cover 111 and the motor housing 112, and the pump rotor 16 is accommodated in the first inner cavity 17. The bottom cover 113 is fixedly connected to the other end of the motor housing 112, specifically, as an implementation method, the bottom cover 113 is fixedly connected to the other end of the motor housing 112 by screws. A second inner cavity 18 is formed between the motor housing 112 and the bottom cover 113, and part of the motor rotor assembly 13, the stator assembly 12, the control board assembly 15, and the detection unit 14 are accommodated in the second inner cavity 18. 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 limitedly 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.

[0026] The detection unit 14 includes a detection member 141 and a phase sensor, and the detection member 141 includes a detection magnet. When the electric pump is working, the control board assembly 15 controls the current passing through the stator assembly 12 to change according to a certain rule, thereby controlling the stator assembly 12 to generate a changing excitation magnetic field, and the motor rotor 131 rotates under the action of the excitation magnetic field. The motor rotor 131 drives the pump rotor 16 to rotate through the shaft 132. When the pump rotor 16 rotates, the working medium is pressed out of the oil outlet 1112 to generate flow power. The first inner cavity 17 and the second inner cavity 18 are connected. When the electric pump is working, the working medium enters the first inner cavity 17 through the oil inlet 1111, and the working medium leaves the first inner cavity 17 through the oil outlet 1112. Since the first inner cavity 17 and the second inner cavity 18 are connected, the working medium in the first inner cavity 17 can enter the second inner cavity 18. In this way, the working medium located in the second inner cavity 18 can contact the stator assembly 12 and / or the control board assembly 15, which is beneficial to the heat dissipation of the stator assembly 12 and / or the control board assembly 15.

[0027] Please refer to Figures 1 to 9 The shaft 132 includes a first end 1322 and a second end 1323, the first end 1322 is close to the motor rotor 131, the second end 1323 is close to the pump rotor 16, the first end 1322 is located in the second inner cavity 18, and the second end 1323 is located in the first inner cavity 17. Along the axial direction of the electric pump, at least part of the motor rotor assembly 13 is located on one side of the detection unit 14, and at least part of the control board assembly 15 is located on the other side of the detection unit 14. Specifically, the detection unit 14 includes a detection member 141 and a phase sensor, the detection member 141 is fixed to a part of the shaft 132, and the phase sensor is fixed to the control board assembly 15. In this way, it is beneficial to control the axial gap between the detection member 141 and the phase sensor, and thus it is beneficial to improve the phase detection accuracy of the motor rotor assembly 13.

[0028] The shaft 132 has an inner hole 1324, and along the axial direction of the electric pump, the inner hole 1324 extends from the second end 1323 to the first end 1322. To facilitate the processing of the inner hole 1324, along the axial direction of the electric pump, one end of the inner hole 1324 is connected to the first inner cavity 17, and the other end of the inner hole 1324 is connected to the second inner cavity 18. The inner hole 1324 can flow the working medium. It can be understood that the working medium can enter the second inner cavity 18 through the inner hole 1324; or, it can be understood that the working medium of the second inner cavity 18 can leave the second inner cavity 18 through the inner hole 1324. In one embodiment, the inner hole 1324 penetrates part of the shaft 132 along the length direction of the shaft 132, and the inner hole 1324 includes an opening 1321a, which is located at the first end 1322. In order to reduce the distance between the detection member 141 and the phase sensor in the direction of the shaft 132, the detection member 141 is arranged close to the first end 1322. The inner hole 1324 generally includes two openings, one opening 1321a is located at the first end 1322, and the other opening can be located at the second end 1323. Of course, as other embodiments, the opening can also be located at the peripheral side wall of the shaft 132. In this embodiment, the other opening is located at the second end 1323. In this embodiment, the inner hole 1324 has a side opening 1324a on the outer side wall of the first end 1322, and the side opening 1324a is connected to the second inner cavity 18. The inner hole 1324 can flow the working medium, and the working medium can flow into the second inner cavity 18 through the side opening 1324a. The working medium located in the second inner cavity 18 can contact the stator assembly 12 and / or the control board assembly 15, which is conducive to heat dissipation of the stator assembly 12 and / or the control board assembly 15.

[0029] Please refer to Figures 3 to 11The shaft 132 includes a mounting portion 1321, the detection unit 14 includes a detection member 141, at least part of the detection member 141 is located in the mounting cavity of the mounting portion 1321, the mounting portion 1321 includes a body portion 1325 and a pressing portion 1326, the cavity wall of the mounting cavity includes at least the inner wall of the body portion 1325, the pressing portion 1326 extends from the body portion 1325 toward the central axis of the electric pump, the detection member 141 includes a matching portion 143, in the axial direction of the electric pump, the matching portion 143 and the pressing portion 1326 are limited, the body portion 1325 can radially limit the detection member 141, the pressing portion 1326 is provided, and the body portion 1325 can radially limit the detection member 141. Part 1326 can axially limit the detection member 141. When the electric pump is working, the detection member 141 rotates with the shaft, which is beneficial to prevent the detection member 141 from falling off from the shaft 132 due to centrifugal force, thereby helping to improve the reliability of the electric pump; secondly, compared with the detection member 141 and the shaft 132 being fixed by adhesive, the adhesive can be prevented from failing in a high temperature environment, which is beneficial to increasing the life of the electric pump, and since no adhesive is required, the use of some materials is reduced, which is beneficial to reducing the manufacturing cost of the electric pump; no additional components are required to fix the detection member 141, which is beneficial to simplifying the structure of the electric pump.

[0030] Please refer to Figures 3 to 6 The mating portion 143 includes an end wall 1431 and a side wall 1432. The side wall 1432 extends from the end wall 1431 toward the direction close to the motor rotor 131. The side wall 1432 is clearance-matched with the peripheral side wall of the main body 1325. In the axial direction of the electric pump, the end wall 1431 abuts against the inner side wall of the pressing portion 1326. The pressing portion 1326 limits the axial position of the detection member 141, which is beneficial to prevent the detection member 141 from falling off the shaft 132, thereby helping to improve the reliability of the electric pump; the detection member 141 can be first placed in the installation portion 1321, and the pressing portion 1326 is formed by deforming the extruded material. For example, the pressing portion 1326 can be formed by deforming part of the shaft 132 through a riveting process. When the detection member 141 is installed, it is beneficial to reduce the damage of the detection member 141, thereby helping to improve the yield of the product.

[0031] Please refer to Figures 3 to 5 , Figures 7 and 8 The matching portion 143 has a side wall 1432, and the side wall 1432 includes a first side wall 1432a and a second side wall 1432b. The first side wall 1432a is clearance-matched or transition-matched with the outer peripheral wall of the body portion 1325, and at least part of the second side wall 1432b contacts the inner side wall of the pressing portion 1326. In some embodiments, the second side wall 1432b abuts against the inner side wall of the pressing portion 1326. Using the structure of the shaft 132 itself to limit the position of the detection member 141 is conducive to simplifying the structure of the electric pump compared to fixing the detection member 141 to the shaft 132 by a bracket.

[0032] The extension direction of the first side wall 1432a is parallel to the central axis of the electric pump, and the second side wall 1432b extends obliquely from the first side wall 1432a toward the central axis of the electric pump, or the first side wall 1432a is connected to the second side wall 1432b, and the second side wall 1432b is an arc-shaped wall. The pressing portion 1326 can be arranged in cooperation with the second side wall 1432a, so as to limit the axial movement of the detection member 141, which is beneficial to prevent the detection member 141 from falling off the shaft 132, thereby helping to improve the reliability of the electric pump.

[0033] The mating portion 143 has an end wall 1431, which extends from the second side wall 1432b toward the center axis of the electric pump. In the axial direction of the electric pump, the end wall 1431 abuts against the inner wall of the pressing portion 1326. In addition, the position of the detection member 141 is limited by the structure of the shaft 132 itself, which is beneficial to simplifying the structure of the electric pump compared to fixing the detection member 141 to the shaft 132 by means of a bracket.

[0034] Please refer to Figures 3 to 11 The shaft 132 includes a first end 1322 and a second end 1323. Along the axial direction of the electric pump, the mounting portion 1321 is concave from the first end 1322 to the second end 1323. The detection member 141 is entirely located in the mounting cavity of the mounting portion 1321. The processing of the detection member 141 is relatively simple, which is beneficial to reducing the manufacturing cost of the electric pump.

[0035] Please refer to Figures 3 to 5 , Figures 9 to 11 The motor rotor 131 is located on the circumferential outer side of the shaft 132. The detection member 141 includes a convex portion 145. In the axial direction of the electric pump, the convex portion 145 extends from the matching portion 143 in a direction away from the motor rotor 131. At least part of the convex portion 145 protrudes from the mounting portion 1321. Since the material of the shaft 132 is metal, the magnetic field of the detection member 141 may be absorbed by the shaft 132, so that the phase sensor cannot sense the detection member 141. The convex portion 145 protrudes from the mounting portion 1321. On the one hand, it is beneficial for the phase sensor to sense the detection member 141. On the other hand, the convex portion 145 is close to the phase sensor, which is beneficial to improve the detection accuracy. The convex portion 145 and the matching portion 143 are integrally structured. In the radial direction of the electric pump, the radial width of the convex portion 145 is smaller than the radial width of the matching portion 143. Compared with the detection member 141 with the same radial width and the same axial length, the material of the detection member 141 can be reduced.

[0036] Please refer to Fig.12 and Fig.13, the pressing portion 1326 surrounds the central axis of the electric pump; or, the electric pump includes at least two pressing portions 1326, and the pressing portions 1326 are circumferentially spaced around the central axis of the electric pump. The pressing portions 1326 can have a larger contact area with the detection member 141, which is beneficial to improving the fixing strength of the detection member 141 and preventing the detection member 141 from falling off the shaft 132, thereby helping to improve the reliability of the electric pump.

[0037] Please refer to Figure 8 The pressing portion 1326 has an outer side wall 1326a, and the outer side wall 1326a extends obliquely from the outer side wall of the main body 1325 toward the direction close to the central axis of the electric pump, which is beneficial to increase the contact area between the pressing portion 1326 and the detection member 141; or the pressing portion 1326 includes a first pressing portion 1326b and a second pressing portion 1326c, the first pressing portion 1326b has a first outer side wall 1326d, the second pressing portion 1326c has a second outer side wall 1326e, and the first outer side wall The angle between the extension direction of 1326d and the extension direction of the second outer wall 1326e is 90 degrees to 150 degrees. Since the detection part 141 is usually formed by powder metallurgy sintering, if the angle is small after riveting, it will be unfavorable for the fixation of the detection part; since the detection part 141 is usually formed by powder metallurgy sintering, and the detection part 141 and the inner peripheral wall of the pressing part 1326 must ensure sufficient interference, if the angle is large after riveting, the risk of damaging the detection part 141 during the riveting process is relatively high.

[0038] Please refer to Figures 1 to 15 As shown, the detection unit 14 includes a phase sensor, which includes but is not limited to a Hall sensor 142. The electric pump includes a control board assembly 15, which includes a substrate 151, and the Hall sensor 142 is fixed to the substrate 151. Specifically, the substrate 151 includes a front surface 1511 and a back surface 1512. Along the axial direction of the electric pump, the front surface 1511 is closer to the motor rotor assembly 13 than the back surface 1512, and at least part of the Hall sensor 142 is located on the front surface 1511. In order to improve the detection accuracy of the detection unit 14 on the motor rotor assembly 13, the Hall sensor 142 is arranged close to the central axis of the shaft 132.

[0039] 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 motor rotor (131), a shaft (132) and a detection unit (14); the shaft (132) is fixedly connected or position-limitedly connected to the motor rotor (131); the shaft (132) comprises a mounting portion (1321); the detection unit (14) comprises a detection member (141); at least a portion of the detection member (141) is located in a mounting cavity of the mounting portion (1321); the mounting portion (1321) comprises a body portion (1325) and a pressing portion (1326); a cavity wall of the mounting cavity comprises at least an inner wall of the body portion (1325); the pressing portion (1326) extends from the body portion (1325) toward a central axis of the electric pump; the detection member (141) comprises a matching portion (143); in the axial direction of the electric pump, the matching portion (143) and the pressing portion (1326) are position-limitedly arranged.

2. The electric pump according to claim 1, characterized in that: The shaft (132) is located on the circumferential outer side of the motor rotor (131), and the matching portion (143) includes an end wall (1431) and a side wall (1432), wherein the side wall (1432) extends from the end wall (1431) toward the motor rotor (131), and the side wall (1432) is gap-matched with the circumferential side wall of the main body (1325). In the axial direction of the electric pump, the end wall (1431) abuts against the inner wall of the pressing portion (1326).

3. The electric pump according to claim 1, characterized in that: The mating portion (143) has a side wall (1432), and the side wall (1432) includes a first side wall (1432a) and a second side wall (1432b), wherein the first side wall (1432a) is loosely matched with the peripheral side wall of the main body portion (1325), and at least a portion of the second side wall (1432b) contacts the inner side wall of the pressing portion (1326).

4. The electric pump according to claim 3, characterized in that: The extension direction of the first side wall (1432a) is parallel to the central axis of the electric pump, and the second side wall (1432b) extends obliquely from the first side wall (1432a) toward the central axis of the electric pump; or, the first side wall (1432a) is connected to the second side wall (1432b), and the second side wall (1432b) is an arc-shaped wall.

5. The electric pump according to claim 3 or 4, characterized in that: The matching portion (143) has an end wall (1431), and the end wall (1431) extends from the second side wall (1432b) toward the central axis of the electric pump. In the axial direction of the electric pump, the end wall (1431) abuts against the inner wall of the pressing portion (1326).

6. The electric pump according to claim 3 or 4, characterized in that: The shaft (132) includes a first end (1322) and a second end (1323); along the axial direction of the electric pump, the mounting portion (1321) is concave from the first end (1322) to the second end (1323); and the detection member (141) is entirely located in the mounting cavity of the mounting portion (1321).

7. The electric pump according to claim 1 or 2, characterized in that: The motor rotor (131) is located on the circumferential outer side of the shaft (132), and the detection member (141) includes a convex portion (145). In the axial direction of the electric pump, the convex portion (145) extends from the matching portion (143) in a direction away from the motor rotor (131), and at least a portion of the convex portion (145) protrudes from the mounting portion (1321).

8. The electric pump according to claim 7, characterized in that The convex portion (145) and the matching portion (143) are integrally structured, and in the radial direction of the electric pump, the radial width of the convex portion (145) is smaller than the radial width of the matching portion (143).

9. The electric pump according to any one of claims 1 to 3 and 7, characterized in that: The pressure portion (1326) surrounds the central axis of the electric pump; or, the electric pump includes at least two pressure portions (1326), and the pressure portions (1326) are distributed circumferentially with the central axis of the electric pump as the center.

10. The electric pump according to claim 9, characterized in that The pressing portion (1326) has an outer wall (1326a), and the outer wall (1326a) extends obliquely from the outer wall of the main body (1325) toward the direction close to the central axis of the electric pump; or, the pressing portion (1326) includes a first pressing portion (1326b) and a second pressing portion (1326c), the first pressing portion (1326b) has a first outer wall (1326d), and the second pressing portion (1326c) has a second outer wall (1326e), and the angle (α) between the extension direction of the first outer wall (1326d) and the extension direction of the second outer wall (1326e) is 90 degrees to 150 degrees.

Images