Electronic oil pump and manufacturing method thereof

Abstract

The electronic oil pump comprises a motor rotor assembly and a detection unit, the motor rotor assembly comprises a shaft and a motor rotor, the shaft is fixedly connected with the motor rotor, the shaft is provided with 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, and the peripheral side wall part of the mounting part comprises a base part and a convex part; the base part is in clearance fit or transition fit with the fixing part, the convex part is in interference fit with the fixing part, and the convex part is formed by extruding and deforming a material. The invention further discloses a manufacturing method of the electronic oil pump. Through the mode, the detection piece can be firstly put into the mounting part, the convex part is formed through extrusion deformation of a material, and the convex part is in interference fit with the detection piece, so that when the detection piece is mounted, the damage of the detection piece is reduced, and the yield of products is improved.

Description

Technical Field

[0001] This application relates to the field of fluid control, and particularly to an electronic oil pump.

Background Art

[0002] The electronic oil pump includes a motor rotor assembly and a detection component. The motor rotor assembly includes a shaft, and the shaft has a mounting portion. To ensure the connection strength between the detection component and the shaft, the detection component is in interference fit with the wall portion corresponding to the mounting portion. When pressing the detection component, the detection component is easily damaged, increasing the defective rate of the product.

Summary of the Invention

[0003] The purpose of the present invention is to provide an electronic oil pump and a manufacturing method thereof, which are beneficial to increasing the yield of the product.

[0004] To achieve the above purpose, an embodiment provided in this application adopts the following technical solution: An electronic oil pump includes a motor rotor assembly and a detection unit. The motor rotor assembly includes a shaft and a motor rotor, the shaft is fixedly connected to the motor rotor, the shaft includes a mounting portion, the detection unit includes a detection component, at least part of the detection component is located in the mounting cavity of the mounting portion, the mounting portion includes a fixing portion, the peripheral side wall portion of the mounting portion includes a base portion and a convex portion, the base portion is in clearance fit or transition fit with the fixing portion, the convex portion is in interference fit with the fixing portion, and the convex portion is formed by material extrusion deformation.

[0005] In an embodiment of this application, the peripheral side wall portion corresponding to the mounting portion includes a base portion and a convex portion, the base portion is in clearance fit or transition fit with the fixing portion, and the convex portion is in interference fit with the fixing portion. In this way, the detection component can be first placed into the mounting portion, the convex portion is formed by material extrusion deformation, and the convex portion is in interference fit with the detection component. Thus, when installing the detection component, it is beneficial to reduce the damage of the detection component, and further beneficial to improve the yield of the product.

[0006] An embodiment of a manufacturing method of an electronic oil pump provided in this application adopts the following technical solution: A manufacturing method of an electronic oil pump: Assemble the detection component to the mounting portion of the shaft; Extrude the first end portion of the shaft or extrude the peripheral side wall portion of the mounting portion of the shaft to form a pressing portion. During the forming process of the pressing portion, the wall portion corresponding to the mounting portion is extruded and deformed to form a convex portion, and the formed convex portion presses the fixing portion of the detection component, so that the convex portion is in interference fit with the fixing portion.

[0007] In an embodiment of the present application, a pressing portion is formed by pressing the first end of the shaft or the circumferential side wall portion of the mounting portion of the shaft. After the corresponding wall portion of the mounting portion is pressed and deformed, a convex portion is formed. The formed convex portion presses the fixing portion of the detecting member, so that the convex portion and the fixing portion are in interference fit. In this way, the detecting member can be first placed into the mounting portion, the convex portion is formed by pressing and deforming the material, and the convex portion and the detecting member are in interference fit. Thus, when the detecting member is installed, it is beneficial to reduce the damage of the detecting member, and further beneficial to improve the yield of the product.

Description of the Drawings

[0008] Figure 1 is a perspective structural view of the first embodiment of the electronic oil pump of the present application;

[0009] Figure 2 is Figure 1 an exploded structural view of the electronic oil pump in;

[0010] Figure 3 is Figure 1 a sectional structural view of the first embodiment of the electronic oil pump along X-X in;

[0011] Figure 4 is Figure 3 a perspective structural view of the first embodiment of the fixing manner of the motor rotor assembly and the detecting member in the electronic oil pump in;

[0012] Figure 5 is Figure 4 a sectional structural view of the electronic oil pump along Y-Y in;

[0013] Figure 6 is Figure 5 an enlarged structural view of I in;

[0014] Figure 7 is Figure 5 a perspective structural view in the C direction in;

[0015] Figure 8 is Figure 7 an enlarged structural view of II in;

[0016] Figure 9 is Figure 1 a sectional structural view of the second embodiment of the electronic oil pump along X-X in;

[0017] Figure 10 is Figure 9 a perspective structural view of the first embodiment of the fixing manner of the shaft and the detecting member in the electronic oil pump in;

[0018] Figure 11 is Figure 10 a sectional structural view of the electronic oil pump along Z-Z in;

[0019] Figure 12 is Figure 11 The enlarged schematic structural view at position III in

[0020] Figure 13 is Figure 1 The three-dimensional structural view of the shaft in the third implementation manner of the electronic oil pump in

[0021] Figure 14 is Figure 13 The enlarged schematic structural view at position IV in

[0022] Figure 15 is Figure 3 、 Figure 9 、 Figure 13 The three-dimensional structural view in one direction of the first implementation manner of the connection mode between the control board assembly and the Hall sensor of the electronic oil pump in the implementation manner

[0023] Figure 16 is Figure 3 、 Figure 9 、 Figure 13 The three-dimensional structural view in another direction of the first implementation manner of the connection mode between the control board assembly and the Hall sensor of the electronic oil pump in the implementation manner

[0024] In the drawings: 100, electronic oil pump;

[0025] 11, housing; 111, pump cover; 1111, oil inlet; 1112, oil outlet; 112, motor housing; 113, bottom cover;

[0026] 12, stator assembly; 121, stator core; 122, insulating part; 123, winding;

[0027] 13, motor rotor assembly; 131, motor rotor; 132, shaft; 1321, mounting part;

[0028] 1321a, circumferential side wall part; 1321b, base part; 1321c, convex part; 1321d, bottom part;

[0029] 1322, first end part; 1322a, pressing part; 1323, main body part; 1323a, body part; 1323b, positioning part; 1324, second end part;

[0030] 14, detection unit; 141, detection part; 1411, detection magnet; 1411a, fixing part; 1411b, outer side wall part;

[0031] 142, Hall sensor;

[0032] 15. Control board assembly; 151. Substrate; 1511. Front side; 1512. Back side;

[0033] 16. Pump rotor;

[0034] 17. Pump inner cavity; 18. Motor cavity.

Specific embodiments

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] The following further details the specific embodiments of the present application with reference to the accompanying drawings. First of all, it should be noted that the orientation terms such as up, down, left, right, front, back, inner, outer, top, bottom, etc. mentioned or possibly mentioned in the specification of the present invention are defined relative to the structure shown in the corresponding drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0037] The electronic oil pump 100 can be applied to the automotive lubrication system and / or cooling system, and can provide flowing circulating power for the working medium in the automotive lubrication system and / or cooling system. The automotive lubrication system and / or cooling system can provide lubricating oil and / or cooling oil for the transmission system.

[0038] Please refer to Figures 1 to 16As shown in the figure, the electric oil pump 100 includes a housing 11, a motor rotor 131 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 11, and a bottom cover 113. The pump cover 111 has an oil inlet 1111 and an oil outlet 1112. The oil inlet 1111 is for the inflow of the working medium, and the oil outlet 1112 is for the outflow of the working medium. One end of the pump cover 111 is fixedly connected to one end of the motor housing 11. Specifically, as an implementation manner, one end of the pump cover 111 is fixedly connected to one end of the motor housing 11 by screws. A pump inner cavity 17 is formed between the pump cover 111 and the motor housing 11, and the pump rotor 16 is accommodated in the pump inner cavity 17. The bottom cover 113 is fixedly connected to the other end of the motor housing 11. Specifically, as an implementation manner, the bottom cover 113 is fixedly connected to the other end of the motor housing 11 by screws. A motor cavity 18 is formed between the motor housing 11 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 motor cavity 18. The stator assembly 12 includes a stator core 121, an insulating part 122, and a winding 123. The insulating part 122 is coated on at least the surface of the stator core 121, and the winding 123 is wound around the insulating part 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 assembly 13 is drivingly connected to the pump rotor 16. As an implementation manner, part of the shaft 132 is fixed to the pump rotor 16. Specifically, the pump rotor 16 is in interference fit with part of the shaft 132.

[0039] The detection unit 14 includes a detection part 141 and a phase sensor. Specifically, the detection part 141 includes a detection magnet 1411, and the phase sensor includes a Hall sensor 142. When the electric oil pump 100 works, the control board assembly 15 controls the current passing through the stator assembly 12 to change according to a certain rule, so as to control the stator assembly 12 to generate a changing excitation magnetic field. The motor rotor assembly 13 rotates under the action of the excitation magnetic field. The motor rotor assembly 13 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 a flowing power. The pump inner cavity 17 and the motor cavity 18 are communicated. When the electric oil pump 100 works, the working medium enters the pump inner cavity 17 through the oil inlet 1111 and leaves the pump inner cavity 17 through the oil outlet 1112. Since the pump inner cavity 17 and the motor cavity 18 are communicated, the working medium in the pump inner cavity 17 can enter the motor cavity 18. In this way, the working medium located in the motor cavity 18 can contact the stator assembly 12 and / or the control board assembly 15, which is beneficial to dissipating heat from the stator assembly 12 and / or the control board assembly 15.

[0040] Just as Figures 1 to 16As shown, the shaft 132 includes a first end 1322 and a second end 1324. The first end 1322 is close to the motor rotor 131, and the second end 1324 is close to the pump rotor 16. The first end 1322 is located in the motor cavity 18, and the second end 1324 is located in the inner pump cavity 17. Along the axial direction of the shaft 132 of the electronic oil pump 100, the inner hole extends from the second end 1324 towards the first end 1322. For the convenience of machining the inner hole, along the axial direction of the shaft 132 of the electronic oil pump 100, one end of the inner hole communicates with the inner pump cavity 17, and the other end of the inner hole communicates with the motor cavity 18. The inner hole can allow the working medium to flow through. It can be understood that the working medium can enter the motor cavity 18 through the inner hole; or, it can be understood that the working medium in the motor cavity 18 can leave the motor cavity 18 through the inner hole. Along the axial direction of the shaft 132 of the electronic oil pump 100, at least part of the motor rotor 131 assembly 13 is on one side of the detection unit 14, and at least part of the control board assembly 15 is on the other side of the detection unit 14. Specifically, the detection unit 14 includes a detection piece 141 and a phase sensor. The detection piece 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 clearance between the detection piece 141 and the phase sensor, and thus beneficial to improve the phase detection accuracy of the motor rotor 131 assembly 13. It should be noted that the axial direction of the shaft 132 of the electronic oil pump 100 here and hereinafter is the direction in which the center line of the shaft 132 extends.

[0041] As described above, the electronic oil pump can be applied to the automotive lubrication system and / or cooling system. The working environment of the electronic oil pump is relatively complex. For example, it needs to adapt to different temperatures. Therefore, when ensuring the connection strength between the detection piece 141 and the shaft 132 at different temperatures, it is a technical problem that those skilled in the art need to consider.

[0042] Please refer to Figures 1 to 16As shown, an electronic oil pump 100 includes a motor rotor assembly 13 and a detection unit 14. The motor rotor assembly 13 includes a shaft 132 and a motor rotor 131. The shaft 132 is fixedly connected to the motor rotor 131. The shaft 132 has a mounting portion 1321. The detection unit 14 includes a detection member 141. At least a part of the detection member 141 is located in the mounting portion 1321. The detection member 141 located in the mounting portion 1321 is defined as a fixed portion 1411a. The corresponding peripheral side wall portion 1321a of the mounting portion 1321 includes a base portion 1321b and a convex portion 1321c. The base portion 1321b is in clearance fit or transition fit with the fixed portion 1411a. The convex portion 1321c is formed by material extrusion deformation. The convex portion 1321c is in interference fit with the fixed portion 1411a. In this way, first, through the deformation of the material of the detection member 141 and the shaft 132, the detection member 141 and the shaft 132 are in interference fit, so as to realize the reliable connection between the detection member 141 and the shaft 132. Compared with the way of fixing the detection member 141 and the shaft 132 with an adhesive, the situation that the adhesive fails at different temperatures is effectively avoided, which is beneficial to improving the service life of the electronic oil pump 100. Second, since no adhesive is required, the use of some materials is reduced, which is beneficial to reducing the manufacturing cost of the electronic oil pump 100. Third, the detection member 141 can be first placed into the mounting portion 1321, and the convex portion 1321c is formed by material extrusion deformation. The convex portion 1321c is in interference fit with the detection member 141. In this way, when installing the detection member 141, it is beneficial to reduce the damage of the detection member 141, and thus beneficial to improving the product yield.

[0043] Further, as an implementation manner, please refer to Figures 1 to 16 As shown, the shaft 132 includes a main body portion 1323 and a first end portion 1322. The first end portion 1322 is located at one end of the main body portion 1323. Along the axial direction of the shaft 132 of the electronic oil pump 100, the mounting portion 1321 is recessed from the first end portion 1322 into the main body portion 1323. Specifically, the shaft 132 includes a main body portion 1323, a first end portion 1322, and a second end portion 1324. The first end portion 1322 and the second end portion 1324 are located at both ends of the main body portion 1323. The first end portion 1322 is closer to the control board assembly 15 than the second end portion 1324. In this way, by using the structure of the shaft 132 itself to fix the detection member 141, compared with the way of fixing the detection member 141 to the shaft 132 through a bracket, it is beneficial to simplify the structure of the electronic oil pump 100.

[0044] Further, as an implementation manner, please refer to Figures 1 to 16As shown, the wall portion corresponding to the mounting portion 1321 includes a bottom portion 1321d, and the end portion of at least a part of the fixing portion 1411a abuts against the bottom portion 1321d. In this way, along the axial direction of the electronic oil pump 100, it is beneficial to limit the detection member 141 in the axial direction, beneficial to control the dimension of the detection member 141 in the axial direction of the electronic oil pump 100, so as to further control the gap between the detection member 141 and the detection magnet 1411 in the axial direction of the electronic oil pump 100, and further beneficial to improving the position accuracy of the Hall sensor 142 for detecting the motor rotor assembly 13.

[0045] As an implementation method, please refer to Figures 1 to 16 As shown, the convex portion 1321c is formed by the extrusion deformation of the material. Specifically, the convex portion 1321c is formed by deforming the material through, but not limited to, riveting, and the detection member 141 is extruded, so that the convex portion 1321c and the detection member 141 are in interference fit. In this way, first, to ensure the connection strength between the detection member 141 and the shaft 132, the wall portion corresponding to the detection member 141 and the mounting portion 1321 must ensure a sufficient interference amount. If the detection member 141 is press-fitted after the convex portion 1321c is formed, since the detection member 141 is usually formed by powder metallurgy sintering, it effectively reduces the crushing of the detection member 141 during the press-fitting process, and further beneficial to improving the yield of the electronic oil pump 100. Second, the convex portion 1321c is formed by riveting, and the process method is simple, which reduces the manufacturing cost of the electronic oil pump 100.

[0046] As an implementation method, please refer to Figures 1 to 2 and Figure 13 、 Figure 14 As shown, the first end portion 1322 includes a pressing portion 1322a. Along the radial direction of the electronic oil pump 100, the pressing portion 1322a is located radially outside the circumferential side wall portion 1321a corresponding to the mounting portion 1321. The pressing portion 1322a is concave into the main body portion 1323 from the first end portion 1322. During the formation of the pressing portion 1322a, the convex portion 1321c is formed by the material deforming and protruding along the radial direction of the electronic oil pump 100. Specifically, there are multiple convex portions 1321c, and the multiple convex portions 1321c are evenly distributed in the radial direction outside the circumferential side wall portion 1321a corresponding to the mounting portion 1321 along the circumferential direction of the circumferential side wall portion 1321a corresponding to the mounting portion 1321.

[0047] As an implementation method, please refer to Figures 1 to 8 and Figure 13 and Figure 14 As shown, the detection member 141 is entirely located in the mounting portion 1321, and the plane where the end portion of the detection member 141 is located is flush with the plane where the first end portion 1322 is located.

[0048] As an implementation method, please refer toFigures 1 to 2 , Figures 9 to 12 As shown, the main body portion 1323 includes a body portion 1323a and a positioning portion 1323b. The positioning portion 1323b is closer to the first end portion 1322 relative to the body portion 1323a. Along the axial direction of the electronic oil pump 100, the radial dimension of the peripheral side wall portion 1321a of the positioning portion 1323b is smaller than the radial dimension of the peripheral side wall portion 1321a of the body portion 1323a. The mounting portion 1321 is recessed from the first end portion 1322 into the positioning portion 1323b, and the detecting member 141 protrudes from the first end portion 1322, reducing the influence of the shaft 132 on the magnetic field intensity of the detecting member 141. Furthermore, it is beneficial to improve the phase sensor, specifically, the intensity of the induced magnetic field of the Hall sensor 142, and further beneficial to improve the detection accuracy of the Hall sensor 142. The detecting member 141 protrudes from the first end portion 1322, and there is no special limitation on whether the shaft 132 is magnetically conductive. It can be understood that the shaft 132 can be made of a magnetically conductive material or a non-magnetically conductive material, increasing the selection space for the shaft 132 material. In this embodiment, the shaft 132 is made of a magnetically conductive material, which is beneficial to improve the structural strength of the shaft 132.

[0049] Furthermore, as an implementation manner, please refer to Figures 1 to 2 , Figures 9 to 12 As shown, along the axial direction of the electronic oil pump 100, from the body portion 1323a to the first end portion 1322, the radial dimension of the positioning portion 1323b gradually decreases. Such a structure is more conducive to the deformation of the material to form the convex portion 1321c.

[0050] As an implementation manner, please refer to Figures 1 to 16 As shown, the shaft 132 includes a pressing portion 1322a, and at least part of the pressing portion 1322a is recessed into the peripheral side wall portion 1321a of the positioning portion 1323b. During the formation of the pressing portion 1322a, the convex portion 1321c is formed by the deformation and protrusion of the material along the radial direction of the electronic oil pump 100.

[0051] Please refer to Figures 1 to 16 As shown, the present application also discloses a manufacturing method of an electronic oil pump 100. Assemble the detecting member 141 to the mounting portion 1321 of the shaft 132; extrude the first end portion 1322 of the shaft 132 to form the pressing portion 1322a. During the forming process of the pressing portion 1322a, the corresponding wall portion of the mounting portion 1321 is extruded and deformed to form the convex portion 1321c, and the formed convex portion 1321c extrudes the fixing portion 1411a of the detecting member 141, so that the convex portion 1321c and the fixing portion 1411a are in interference fit. In this way, it is beneficial to simplify the manufacturing steps of the electronic oil pump.

[0052] Please refer to Figures 1 to 16As shown in the figure, the present application also discloses a manufacturing method of an electronic oil pump 100. An inspection piece 141 is assembled to the mounting portion 1321 of the shaft 132; the outer peripheral side wall portion 1321a of the mounting portion 1321 of the shaft 132 is extruded to form a pressing portion 1322a. During the forming process of the pressing portion 1322a, the corresponding wall portion of the mounting portion 1321 is extruded and deformed to form a convex portion 1321c. The formed convex portion 1321c presses the fixing portion 1411a of the inspection piece 141, so that the convex portion 1321c and the fixing portion 1411a are in interference fit. In this way, first, it is beneficial to simplify the manufacturing steps of the electronic oil pump; second, the inspection piece 141 can be first placed into the mounting portion 1321, and the convex portion 1321c is formed by extrusion deformation of the material. The convex portion 1321c and the inspection piece 141 are in interference fit. Thus, when the inspection piece 141 is installed, it is beneficial to reduce the damage of the inspection piece 141, and further beneficial to improve the yield of the product.

[0053] Please refer to Figures 1 to 16 As shown in the figure, the detection unit 14 includes a phase sensor. The phase sensor includes, but is not limited to, a Hall sensor 142. The electronic oil pump 100 includes a control board assembly 15. The control board assembly 15 includes a substrate 151. 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 electronic oil pump 100, the front surface 1511 is closer to the motor rotor assembly 13 than the back surface 1512. The Hall sensor 142 is fixed to the front surface 1511. To improve the detection accuracy of the detection unit 14 for the motor rotor assembly 13, the Hall sensor 142 is arranged close to the central axis 132 line of the shaft 132.

[0054] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify or equivalently replace the present application. All technical solutions and their improvements that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An electronic oil pump (100), characterized in that: the electronic oil pump (100) includes a motor rotor assembly (13) and a detection unit (14), the motor rotor assembly (13) includes a shaft (132) and a motor rotor (131), the shaft (132) is fixedly connected to the motor rotor (131), the 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 detection member (141) includes a fixing portion (1411a), the circumferential side wall portion of the mounting portion (1321) includes a base portion (1321b) and a convex portion (1321c), the base portion (1321b) is in clearance fit or transition fit with the fixing portion (1411a), the convex portion (1321c) is formed by material extrusion deformation, and the convex portion (1321c) is in interference fit with the fixing portion (1411a).

2. The electronic oil pump (100) according to claim 1, characterized in that: the shaft (132) includes a main body portion (1323) and a first end portion (1322), the first end portion (1322) is located at one end of the main body portion (1323), along the axial direction of the electronic oil pump (100), the mounting portion (1321) is concave inward from the first end portion (1322) towards the main body portion (1323).

3. The electronic oil pump (100) according to claim 1 or 2, characterized in that: the wall portion corresponding to the mounting portion (1321) includes a bottom portion (1321d), and at least part of the end portion of the fixing portion (1411a) abuts against the bottom portion (1321d).

4. The electronic oil pump according to any one of claims 1 to 3, characterized in that : the first end portion (1322) includes a pressing portion (1322a), along the radial direction of the electronic oil pump (100), the pressing portion (1322a) is located radially outside the circumferential side wall portion corresponding to the mounting portion (1321), the pressing portion (1322a) is concave inward from the first end portion (1322) towards the main body portion (1323), and during the formation of the pressing portion (1322a), the convex portion (1321c) deforms and protrudes along the radial direction of the electronic oil pump (100).

5. The electronic oil pump (100) according to claim 4, characterized in that : there are a plurality of the convex portions (1321c), and the plurality of convex portions (1321c) are evenly distributed in the radial direction outside the circumferential side wall portion (1321a) corresponding to the mounting portion (1321) along the circumferential direction of the circumferential side wall portion (1321a) corresponding to the mounting portion (1321).

6. The electronic oil pump (100) according to claim 4 or 5, characterized in that : the detection member (141) is entirely located in the mounting portion (1321), and the plane where the end portion of the detection member (141) is located is flush with the plane where the first end portion (1322) is located.

7. The electronic oil pump (100) according to claim 3, characterized in that: The main body part (1323) includes a body part (1323a) and a positioning part (1323b). The positioning part (1323b) is closer to the first end part (1322) relative to the body part (1323a). Along the axial direction of the electronic oil pump (100), the radial dimension of the peripheral side wall part (1321a) of the positioning part (1323b) is smaller than the radial dimension of the peripheral side wall part (1321a) of the body part (1323a). The mounting part (1321) is recessed from the first end part (1322) into the positioning part (1323b), and the detecting part (141) protrudes from the first end part (1322).

8. The electronic oil pump (100) according to claim 7, characterized in that: Along the axial direction of the electronic oil pump (100), from the direction of the body part (1323a) to the first end part (1322), the radial dimension of the positioning part (1323b) gradually decreases.

9. The electronic oil pump (100) according to claim 8, characterized in that: The shaft (132) includes a pressing part (1322a). At least part of the pressing part (1322a) is recessed into the peripheral side wall part (1321a) of the positioning part (1323b). During the formation of the pressing part (1322a), the convex part (1321c) is formed by the material deforming and protruding along the radial direction of the electronic oil pump (100).

10. A manufacturing method of an electronic oil pump (100), characterized in that: Assemble the detecting part (141) to the mounting part (1321) of the shaft (132); Extrude the first end part (1322) of the shaft (132) or extrude the peripheral side wall part (1321a) of the mounting part (1321) of the shaft (132) to form a pressing part (1322a). After the corresponding wall part of the mounting part (1321) is extruded and deformed, a convex part (1321c) is formed. The formed convex part (1321c) presses the fixing part (1411a) of the detecting part (141), so that the convex part (1321c) and the fixing part (1411a) are in interference fit.

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