Method for assembling electric pump

Abstract

The invention relates to an assembling method of an electric pump. The assembling method comprises the steps that an isolation assembly is prepared; a conductive piece and an isolation piece are welded and fixed; or the isolation piece is formed by injection molding by taking the conductive piece as an insert; assembling a stator assembly and the isolation piece, pressing the conductive piece into an insulation frame of the stator assembly, and electrically connecting the conductive piece with a part of windings located on the insulation frame; after the stator assembly and the isolation assembly are assembled, the stator assembly and the motor shell are connected in a limited or fixed mode. The electric pump has the characteristic that the production cost of the electric pump is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an assembling method of an electric pump. BACKGROUND

[0002] The electric pump mainly provides power source for lubricating system and / or cooling system of the vehicle, the electric pump comprises a stator assembly, an isolation component and a motor housing, the stator assembly and the motor housing are fixedly connected, the stator assembly is electrically connected with the isolation component, and the isolation component is fixedly connected with the motor housing, if the electric pump is detected after being assembled, the production cost of the batch production of the electric pump is increased. SUMMARY

[0003] When the electric pump is assembled in batches, the stator assembly and the motor housing are fixedly connected, and the stator assembly and the isolation component are electrically connected, in order to detect whether the conductive part of the isolation component has pierced the winding of the stator assembly, after the isolation component is installed, the electrical performance of the stator assembly is detected, when the stator assembly is found to be faulty in the detection, since the stator assembly and the motor housing have been closely adhered, the difficulty of disassembly is large, and only the defective product can be scrapped, so that the batch production cost of the electric pump is high, and the purpose of the present application is to obtain an assembling method of an electric pump, which is beneficial to reduce the batch production cost of the electric pump.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] An assembling method of an electric pump, the assembling method comprises:

[0006] Preparation of an isolation assembly: welding and fixing a conductive part and an isolation part; or injection molding the isolation part by taking the conductive part as an insert;

[0007] Assembly of a stator assembly and the isolation assembly: pressing the conductive part into an insulating frame of the stator assembly, and electrically connecting the conductive part with part of the winding located in the insulating frame;

[0008] After the stator assembly and the isolation assembly are assembled, the stator assembly and the motor housing are limitingly connected or fixedly connected.

[0009] In the above technical scheme, the conductive part is pressed into the insulating frame of the stator assembly, and the conductive part is electrically connected with part of the winding located in the insulating frame; after the stator assembly and the isolation assembly are assembled, the stator assembly and the motor housing are limitingly connected or fixedly connected, before the stator assembly and the motor housing are connected, the electrical performance of the stator assembly can be detected, if the stator assembly is faulty, the stator assembly is repaired after disassembly or the stator assembly is scrapped, compared with scrapping the stator assembly and the motor housing, the waste of the material of the electric pump can be reduced, and the batch production cost of the electric pump can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1Cross-sectional view of a first embodiment of an electric pump;

[0011] Figure 2 Connection view of a pump housing, a motor housing, a stator assembly and a spacer of a second embodiment of an electric pump;

[0012] Figure 3 Flow chart of one step of an assembly method of a first embodiment of an electric pump;

[0013] Figure 4 Flow chart of one step of an assembly method of a first embodiment of an electric pump;

[0014] Figure 5 Flow chart of one step of an assembly method of a first embodiment of an electric pump;

[0015] Figure 6 Flow chart of one step of an assembly method of a second embodiment of an electric pump;

[0016] Figure 7 Flow chart of one step of an assembly method of a second embodiment of an electric pump;

[0017] Figure 8 Flow chart of one step of an assembly method of a second embodiment of an electric pump.

[0018] 1, pump assembly; 11, pump rotor; 111, inner rotor; 112, outer rotor; 12, motor rotor assembly; 121, motor rotor; 122, shaft; 13, pump cover; 131, inlet passage; 132, outlet passage; 14, pump housing; 15, fixing member; 141, stepped portion; 2, electric drive assembly; 21, stator assembly; 211, insulating frame; 2113, positioning portion; 2114, positioning groove; 212, stator core; 213, winding; 22, electric control assembly; 23, motor housing; 232a, pressing edge; 2321, first limiting portion; 234, pressing portion; 234a, pre-pressing portion; 235, fixing portion; 236, through hole; 242, protruding portion; 244, bottom cover; 245, spacer; 2451, conductive member; 2452, positioning column; 10, first inner cavity; 20, second inner cavity; 30, third inner cavity. DETAILED DESCRIPTION

[0019] The application will be further described below with reference to the drawings and specific embodiments:

[0020] In order to make the skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other embodiments can also be obtained according to these solutions without any creative effort. The up and down orientation words involved herein are defined by the positions of the parts shown in the drawings relative to each other, and are only for the purpose of expressing the clarity and convenience of the technical solutions. It should be understood that the orientation words used herein should not limit the scope of the application claimed.

[0021] The electric pump can be applied in a lubricating system and / or a cooling system of a vehicle, and can provide circulating power for a working medium in the lubricating system and / or the cooling system of the vehicle, which can provide lubricating oil and / or cooling oil for a transmission system. In the present application, "fixed connection of A and B" means that there is no relative displacement between A and B after connection, for example, A and B are welded and fixed; "limiting connection of A and B" means that A limits the movement of B in a certain direction, or B limits the movement of A in a certain direction.

[0022] Please refer to Figure 1 , Figures 3 to 5 , Figure 1The first embodiment of the electric pump of the present application is shown in the schematic diagram. The electric pump comprises a pump assembly 1, an electric drive assembly 2 and a bottom cover 244. The pump assembly 1 comprises a pump rotor 11, a motor rotor assembly 12, a motor housing 23 and a pump cover 13. The electric drive assembly 2 comprises a stator assembly 21, an isolation piece 245 and an electric control assembly 22. The bottom cover 244 is fixedly connected with the isolation piece 245 of the electric drive assembly 2. The motor housing 23 of the pump assembly 1 is fixedly connected with the isolation piece 245 of the electric drive assembly 2. In this embodiment, the screw is sequentially inserted through the bottom cover 244, the isolation piece 245 and the blind groove of the motor housing 23, thereby realizing the fixation of the bottom cover 244, the isolation piece 245 and the motor housing 23. The pump cover 13 is fixedly connected with the motor housing 23. The motor rotor assembly 12 is located at the radially inner side of the stator assembly 21. The stator assembly 21 is limitingly connected with the motor housing 23. The isolation piece 245 has a conductive piece 2451. One end of the conductive piece 2451 is connected with the stator assembly 21. The other end of the conductive piece 2451 is connected with the electric control assembly 22. The isolation piece 245 is fixedly connected with the motor housing 23 and the bottom cover 244. Alternatively, the isolation piece 245 is limitingly connected with the motor housing 23. The motor housing 23 is fixedly connected with the bottom cover 244. The motor rotor assembly 12 comprises a motor rotor 121 and a shaft 122. The motor rotor 121 and the shaft 122 are fixedly connected. The motor rotor 121 is drivingly connected with the pump rotor 11. The electric drive assembly 2 drives the rotation of the pump rotor 11. Specifically, when the electric pump is working, the electric control assembly 22 controls the current passing through the stator assembly 21 to change according to a certain rule, thereby controlling the stator assembly 21 to generate a changing excitation magnetic field. The motor rotor 121 rotates under the action of the excitation magnetic field. The motor rotor 121 drives the pump rotor 11 to rotate through the shaft 122.

[0023] Please refer to Figure 2 、 Figures 6 to 8The electric pump comprises a pump assembly 1 and an electric drive assembly 2, the pump assembly 1 comprises a pump rotor 11 and a pump shell 14, the electric drive assembly 2 comprises a stator assembly 21 and a motor shell 23, the stator assembly 21 is limitingly connected with the motor shell 23, the electric drive assembly 2 drives the rotation of the pump rotor 11, and the pump shell 14 is fixedly connected or limitingly connected with the motor shell 23. The pump assembly 1 further comprises a motor rotor assembly 12 and a pump cover 13, the pump rotor 11 is drivingly connected with the motor rotor assembly 12, and the pump cover 13 is fixedly connected with the pump shell 14. In the embodiment, the pump cover 13 is detachably connected with the pump shell 14, compared with the non-detachable connection, it is convenient to detect and maintain the parts arranged in the inner cavity of the pump shell 14, the inner cavity of the pump cover 13 or the cavity formed by the pump cover 13 and the pump shell 14 together, for example, by opening the connection between the pump cover 13 and the pump shell 14, the running condition of the pump rotor 11 can be detected and the pump rotor 11 can be replaced as required. The electric drive assembly 2 further comprises an electric control assembly 22, when the electric pump works, the electric control assembly 22 controls the current passing through the stator assembly 21 to change according to a certain rule, thereby controlling the stator assembly 21 to generate a changing excitation magnetic field, the motor rotor 121 rotates under the action of the excitation magnetic field, and the motor rotor 121 drives the pump rotor 11 to rotate through a shaft 122.

[0024] Please refer to Figures 1 to 8 The electric pump has a first inner cavity 10 and a second inner cavity 20, the first inner cavity 10 communicates with the second inner cavity 20, the pump rotor 11 is located in the first inner cavity 10, the motor rotor 121 and the stator assembly 21 are located in the second inner cavity 20, and in the embodiment, the electric pump has a third inner cavity 30, the third inner cavity 30 does not communicate with the second inner cavity 20, and the electric control assembly 22 is located in the third inner cavity 30. When the electric pump works, the working medium enters the first inner cavity 10 through an inflow channel 131, and the working medium leaves the first inner cavity 10 through an outflow channel 132. Since the first inner cavity 10 and the second inner cavity 20 are arranged in communication, the working medium in the first inner cavity 10 can enter the second inner cavity 20, and thus the working medium located in the second inner cavity 20 can contact the stator assembly 21, and thus it is beneficial to heat dissipation of the stator assembly 21.

[0025] Please refer to Figures 1 to 8 The preparation method of the electric pump comprises the following steps:

[0026] Preparation of the isolation assembly: welding and fixing the conductive part 2451 and the isolation part 245; or injection molding the isolation part 245 by taking the conductive part 2451 as an insert;

[0027] Assembly of the stator assembly 21 and the isolation assembly: press the conductive part 2451 into the insulating frame 211 of the stator assembly 21, and the conductive part 2451 is electrically connected with the partial winding 213 located in the insulating frame 211;

[0028] After assembling the stator assembly 21 and the isolation assembly, the stator assembly 21 is connected or fixedly connected with the motor housing 23 in position. If the stator assembly 21 and the motor housing 23 are connected in position, in order to detect whether the conductive part 2451 pierces the winding 213 of the stator assembly 21, the electrical performance of the stator assembly 21 is detected after the installation of the isolation part 245. When the stator assembly 21 is found to be faulty, since the stator assembly 21 and the motor housing 23 are tightly attached, it is difficult to disassemble, and only the defective product can be scrapped, which makes the production cost of the electric pump higher. Therefore, how to reduce the production cost of the pump is a technical problem. In the present application, the stator assembly 21 is electrically connected with the conductive part 2451 and then assembled into the motor housing 23. Before being assembled into the motor housing 23, the electrical performance of the stator assembly 21 can be detected. If the stator assembly 21 is faulty, the stator assembly 21 is repaired or scrapped after disassembly, which can relatively reduce the defective product rate or the waste of electric pump materials, and is beneficial to reduce the production cost of the electric pump.

[0029] Between assembling the stator assembly 21 and the isolation assembly and assembling the stator assembly 21 and the motor housing 23, the assembly method comprises: detecting whether the conductive part 2451 is electrically connected with the stator assembly 21. Before being assembled into the motor housing 23, the electrical performance of the stator assembly 21 is detected. If the stator assembly 21 is faulty, the stator assembly 21 is repaired or scrapped after disassembly, which can relatively reduce the defective product rate or the waste of electric pump materials, and is beneficial to reduce the production cost of the electric pump.

[0030] The assembly method of the electric pump comprises forming the positioning part 2113 of the insulating frame 211 with the stator core 212 as an insert, and pressing the conductive part 2451 into the insulating frame 211 while the positioning column 2452 of the isolation part 245 is inserted into the positioning groove 2114 of the positioning part 2113. When assembling the stator assembly 21 and the isolation part 245, the positioning column 2452 can assist in positioning the isolation part 245, which is beneficial to accurately assemble the stator assembly 21 and the isolation part 245.

[0031] After assembling the stator assembly 21 and the isolation part 245, the assembly method of the electric pump further comprises welding the isolation part 245 and the bottom cover 244, or threadedly connecting the isolation part 245 and the bottom cover 244. The connection method of the bottom cover 244 and the isolation part 245 is relatively simple, which is beneficial to improve the production efficiency of the electric pump.

[0032] Please refer to Figures 6 to 8 The assembly method of the electric pump comprises sleeving the motor housing 23 on the circumferential outer side of the stator assembly 21, riveting the outer peripheral wall of the motor housing 23 to form a fixing part 235, and abutting the fixing part 235 against the stator assembly 21. The riveting is at least three-point riveting or whole-circle riveting. The fixing part 235 is tightly attached with the stator assembly 21 to inhibit the radial movement of the stator assembly 21.

[0033] The assembling method of the electric pump comprises assembling the motor rotor assembly 12 and the pump shell 14; sleeving the pump rotor 11 outside the shaft 122 of the motor rotor assembly 12, further sleeving the inner rotor 111 outside the shaft 122 of the motor rotor assembly 12, and then sleeving the outer rotor 112 outside the inner rotor 111; and fixedly connecting the pump shell 14 and the motor shell 23. If the motor rotor assembly 12 and the stator assembly 21 are assembled first, and then assembled with the pump rotor 11, due to the eccentricity between the through hole of the pump rotor 11 and the through hole of the pump shell 14, when the motor rotor assembly 12 and the pump rotor 11 are assembled, the shaft 122 of the motor rotor assembly 12 may not be able to pass through the pump rotor 11. The above-mentioned assembling of the motor rotor assembly 12 and the pump shell 14 takes the shaft 122 of the motor rotor assembly 12 as the center, and the pump rotor 11 and the pump shell 14 are not eccentric, and the assembling is accurate.

[0034] The assembling method of the electric pump comprises forming a stepped portion 141 on the pump shell 14, forming a pre-pressing portion 234a on the motor shell 23, and rolling the pre-pressing portion 234a to form a pressing portion 234, and the pressing portion 234 is fitted with the stepped portion 141. With respect to the fixing of the motor shell 23 and the pump cover 13, the axial length of the motor shell 23 can be relatively reduced, so that the material of the motor shell 23 can be relatively reduced, and the production cost of the electric pump can be relatively reduced.

[0035] Before rolling the pre-pressing portion 234a, the assembling method of the electric pump further comprises pressing the pump shell 14 into the motor shell 23, and limiting the axial position of the pump shell 14 by the stator core 212 of the stator assembly 21. After rolling the pre-pressing portion 234a, the axial position of the pump shell 14 is limited by the pressing portion 234, and the axial position of the pump shell 14 is fixed, and no other additional components are needed to limit the axial position of the pump shell 14 during the assembling process, and the assembling of the pump assembly 1 and the electric drive assembly 2 is relatively simple.

[0036] The assembling method of the electric pump comprises forming a convex portion 242 on the isolation piece 245, forming a pressing edge 232a on the motor shell 23, bending the pressing edge 232a to form a first limiting portion 2321, and the first limiting portion 2321 abuts against the convex portion 242. The connecting method of the motor shell 23 and the isolation piece 245 is relatively simple, which is beneficial to improve the production efficiency of the electric pump.

[0037] Please refer to Figures 3 to 5The assembly method of the electric pump includes: heating the motor housing 23, fitting the motor housing 23 onto the circumferential outer side of the stator assembly 21, and cooling the motor housing 23. Heating the motor housing 23 causes it to expand due to heat, increasing its inner diameter. Then, fitting the motor housing 23 onto the circumferential outer side of the stator assembly 21 for fixation, and after cooling, the inner diameter of the motor housing 23 returns to its original shape. The inner circumferential wall of the motor housing 23 and the outer circumferential wall of the stator assembly 21 form a pressed state, so that the stator assembly 21 and the motor housing 23 fit tightly together, thereby achieving an interference fit between the motor housing 23 and the stator assembly 21.

[0038] The assembly method of the electric pump also includes assembling the motor rotor assembly 12 and the motor housing 23 before limiting or fixing the stator assembly 21 to the motor housing 23; fitting the pump rotor 11 onto the radial outside of the shaft 122 of the motor rotor assembly 12; further, first fitting the inner rotor 111 onto the outside of the shaft 122 of the motor rotor assembly 12, and then fitting the outer rotor 112 onto the outside of the inner rotor 111; the fixing member 15 is screwed into the threaded hole of the motor housing 23 and the threaded hole of the pump cover 13 in sequence. The fixing member 15 is a screw, which can enter the pump cover 13 from the inside of the motor housing 23. Compared with setting fixing parts on the pump cover 13 and the motor housing 23 respectively to fix the pump cover 13 and the motor housing 23, since the fixing parts generally protrude from the outer peripheral wall of the pump cover 13 and the outer peripheral wall of the motor housing 23, it is beneficial to reduce the weight of the pump cover 13 and the motor housing 23, thereby reducing the weight of the electric pump; in addition, reducing the production materials of the pump cover 13 and the motor housing 23 is beneficial to reducing the production cost of the electric pump. Furthermore, when the motor housing 23 and stator assembly 21 are fixedly connected or limited, the stator assembly 21 is fitted onto the outside of the motor rotor assembly 12, and the motor rotor assembly 12 can limit the radial position of the stator assembly 21. In one embodiment, the assembly method of the electric pump, which involves assembling the stator assembly 21 and the isolator 245 and assembling the stator assembly 21 and the motor housing 23, further includes pressing the motor rotor assembly 12 into the radially inner side of the stator assembly 21 along the axial direction of the electric pump. If the motor rotor assembly 12 is pressed into the radially inner side of the stator assembly 21 before assembling the stator assembly 21 and the isolator 245, and an electrical performance test is performed on the stator assembly and a fault is found in the stator assembly 21, the motor rotor assembly 12 needs to be disassembled and reassembled, making the electric pump assembly process complex. In this application, the stator assembly 21 and the isolator 245 are assembled first, and then the motor rotor assembly 12 is pressed into the radial inner side of the stator assembly 21. Since the stator assembly 21 has undergone electrical performance testing during the assembly of the stator assembly 21 and the isolator 245, it is beneficial for the stator assembly 21 to cooperate with the motor rotor assembly 12 and work together. When the motor housing 23 is fitted onto the circumferential outer side of the stator assembly 21, the shaft 122 of the motor rotor assembly 12 passes through the through hole 236 of the motor housing 23.

[0039] The assembling method of the electric pump further comprises the following steps: after assembling the stator assembly 21 and the isolation member 245, pressing the electric control assembly 22 into the isolation member 245, and electrically connecting the circuit board of the electric control assembly 22 with the conductive member 2451. Since the electrical connection between the stator assembly 21 and the conductive member 2451 has been detected before the electric control assembly 22 is electrically connected with the conductive member 2451, if an electrical connection fault occurs subsequently, the electrical connection fault position can be quickly located.

[0040] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and controls can be made, which are within the protection scope of the present application.

Claims

1. A method of assembling an electric pump, characterized by, The assembly method comprises: Preparation of isolation assembly: welding the conductive part (2451) and the isolation part (245); or injection molding the isolation part (245) with the conductive part (2451) as an insert; Assembly of the stator assembly (21) and the isolation assembly: press the conductive part (2451) into the insulating frame (211) of the stator assembly (21), and the conductive part (2451) is electrically connected to the partial winding (213) located in the insulating frame (211); After assembling the stator assembly (21) and the isolation assembly, limit connection or fixed connection is made between the stator assembly (21) and the motor housing (23).

2. The method of assembly of claim 1, wherein, Between the assembly of the stator assembly (21) and the isolation assembly and the assembly of the stator assembly (21) and the motor housing (23), the assembly method comprises: detecting whether the conductive part (2451) is electrically connected to the stator assembly (21).

3. The method of assembling according to claim 1 or 2, characterized in that, The assembly method further comprises assembling the motor rotor assembly (12) and the pump housing (14), the pump rotor (11) is sleeved on the outer side of the shaft (122) of the motor rotor assembly (12), and the pump housing (14) is fixedly connected with the motor housing (23).

4. The method of assembly of claim 3, wherein, In the stepped part (141) of the pump housing (14), a pre-pressing part (234a) is formed on the motor housing (23), and the pre-pressing part (234a) is rolled to form a pressing part (234), and the pressing part (234) is fitted with the stepped part (141).

5. The method of assembly of claim 4, wherein, Before rolling the pre-pressing part (234a), the assembly method of the electric pump further comprises pressing the pump housing (14) into the motor housing (23), and limit connecting the pump housing (14) and the stator core (212) of the stator assembly (21).

6. The method of assembling according to any one of claims 1-5, wherein, The motor housing (23) is sleeved on the circumferential outer side of the stator assembly (21), the outer peripheral wall of the motor housing (23) is riveted to form a fixed part (235), and the fixed part (235) abuts against the stator assembly (21).

7. The method of assembling according to any one of claims 1-6, wherein, In the isolation part (245), a protruding part (242) is formed, and a pressing edge (232a) is formed on the motor housing (23), and the pressing edge (232a) is bent to form a first limiting part (2321), and the first limiting part (2321) abuts against the protruding part (242).

8. The method of assembling according to claim 1 or 2, wherein, Before limit connection or fixed connection of the stator assembly (21) and the motor housing (23), the motor rotor assembly (12) and the motor housing (23) are assembled, the pump rotor (11) is sleeved on the radial outer side of the shaft (122) of the motor rotor assembly (12), and the fixing part (15) is screwed into the threaded hole of the motor housing (23) and the threaded hole of the pump cover (13) in sequence.

9. The method of assembly of claim 8, wherein, The motor housing (23) is heated, the motor housing (23) is sleeved on the circumferential outer side of the stator assembly (21), and the motor housing (23) is cooled, and the inner peripheral wall of the motor housing (23) is fitted with the outer peripheral wall of the stator assembly (21).

10. The method of assembling according to any one of claims 1-9, wherein, The positioning part (2113) of the insulating frame (211) is formed by taking the stator core (212) as an insert, the positioning column (2452) of the isolation piece (245) is inserted into the positioning groove (2114) of the positioning part (2113), and the conductive piece (2451) is pressed into the insulating frame (211).

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