CN110821821B

CN110821821B - Electronic oil pump

Info

Publication number: CN110821821B
Application number: CN201810895280.5A
Authority: CN
Inventors: 不公告发明人
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2018-08-08
Filing date: 2018-08-08
Publication date: 2021-09-28
Anticipated expiration: 2038-08-08
Also published as: CN110821821A

Abstract

The utility model provides an electronic oil pump, includes first casing, second casing and third casing, second casing and first casing relatively fixed, second casing and third casing relatively fixed, electronic oil pump includes stator module and pump shaft, and stator module has first supporting part, and the second casing has the second supporting part, and the pump shaft supports respectively in first supporting part and second supporting part, so is provided with and does benefit to the stability that improves the pump shaft.

Description

Electronic oil pump

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of vehicles, in particular to a pump device.

[ background of the invention ]

With the rapid development of the vehicle industry, the electronic oil pump is widely applied to a vehicle lubricating system and/or a cooling system, the electronic oil pump mainly provides a power source for the vehicle lubricating system and/or the cooling system, the electronic oil pump comprises a pump shaft, the pump shaft is a transmission mechanism of the electronic oil pump, and the stability of the pump shaft is a technical problem to be considered in the design process of the electronic oil pump.

[ summary of the invention ]

The invention aims to provide an electronic oil pump which is beneficial to improving the stability of a pump shaft.

One implementation mode of the invention adopts the following technical scheme: an electronic oil pump comprising a pump shaft, a pump housing, a first rotor assembly, a stator assembly, and a second rotor assembly, the pump housing capable of forming a pump inner cavity, the pump inner cavity comprising a first cavity and a second cavity, the first rotor assembly disposed in the first cavity, the stator assembly and the second rotor assembly disposed in the second cavity; the pump housing includes a first housing, a second housing, and a third housing, the second housing being located between the first housing and the third housing in an axial direction of the electronic oil pump, defining that the first housing is located above the second housing; the second housing comprises a first part, the first cavity is positioned on the upper side of the first part, the second cavity is positioned on the lower side of the first part, and the radial extension direction of the first part is perpendicular to the pump shaft;

the second rotor assembly and the stator assembly are arranged in a clearance mode along the axial direction of the electronic oil pump, the second rotor assembly is located between the stator assembly and the first portion, the stator assembly comprises a stator core and a winding, the stator core comprises a base and a first protruding portion, the first protruding portion extends from the upper surface of the base towards the second rotor assembly, the winding is supported on the first protruding portion, and the axial direction of the winding is parallel to the axial direction of the electronic oil pump;

the base comprises a first supporting part, the first part comprises a second supporting part, the first supporting part and the second supporting part are arranged at intervals, and the second supporting part is provided with a first through hole; the pump shaft comprises a first end portion, a second end portion and a first matching portion, the first matching portion is located between the first end portion and the second end portion, the second end portion of the pump shaft penetrates through the first through hole and is in transmission connection with the first rotor assembly, the first matching portion of the pump shaft is supported on the second supporting portion, and the first end portion of the pump shaft is supported on the first supporting portion.

This technical scheme's electron oil pump, arrange through setting up stator module and second rotor subassembly axial, and then realize that stator module's basal portion has first supporting part, the first portion of second casing has the second supporting part, first supporting part sets up with second supporting part interval, the first end of pump shaft supports in first supporting part, the first cooperation portion of pump shaft supports in the second supporting part, the electron oil pump sets up first supporting part and second supporting part support pump shaft, be favorable to improving the stability of pump shaft.

[ description of the drawings ]

Fig. 1 is a schematic perspective view of an electronic oil pump according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is another schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 4 is a schematic perspective view of a first housing according to one embodiment of the present invention;

FIG. 5 is a schematic view of a second housing according to one embodiment of the present invention;

fig. 6 is a perspective view of a first embodiment of a stator core;

FIG. 7 is a combined schematic view of the stator assembly, pump shaft and second rotor assembly;

fig. 8 is a schematic view of a second embodiment of a stator core;

FIG. 9 is a schematic cross-sectional view of the first embodiment taken along C-C of FIG. 8;

FIG. 10 is a schematic view of the second embodiment taken along C-C of FIG. 8;

FIG. 11 is a schematic view of the third embodiment taken along C-C of FIG. 8;

FIG. 12 is a schematic view of the fourth embodiment taken along C-C of FIG. 8;

FIG. 13 is a schematic view of the fifth embodiment of FIG. 8 taken along C-C;

FIG. 14 is a schematic view of the sixth embodiment taken along C-C of FIG. 8;

FIG. 15 is a schematic perspective view of a pump shaft according to one embodiment of the present invention;

FIG. 16 is a schematic cross-sectional view taken along B-B of FIG. 5;

FIG. 17 is another cross-sectional view taken along B-B of FIG. 5;

FIG. 18 is a schematic view of the combination of the first rotor assembly and the second housing;

FIG. 19 is a schematic view of a combination of a spacer and a connection terminal;

FIG. 20 is an enlarged partial schematic view of FIG. 3;

FIG. 21 is a cross-sectional schematic view of a pump shaft and stator core combination;

FIG. 22 is a schematic view of the seventh embodiment taken along C-C of FIG. 8;

fig. 23 is a schematic view of a third embodiment of a stator core.

[ detailed description ] embodiments

The invention will be further described with reference to the following figures and specific examples:

the electronic oil pump in the embodiment can mainly provide flowing power for the working medium of the vehicle lubricating system and/or cooling system, and particularly can provide flowing power for the working medium of the lubricating system and/or cooling system in the vehicle transmission system.

Referring now to fig. 1-3 and 16-18, the electronic oil pump 1 includes a pump housing, a rotor assembly, a stator assembly 40, and an electronic control board 80, wherein the rotor assembly includes a first rotor assembly 50 and a second rotor assembly 60, the pump housing can form a pump cavity, and the first rotor assembly 50, the stator assembly 40, the second rotor assembly 60, and the electronic control board 80 are disposed in the pump cavity; in the present embodiment, the pump inner cavity includes a first cavity 201 and a second cavity 202, the first rotor assembly 50 is disposed in the first cavity 201, and the stator assembly 40 and the second rotor assembly 60 are disposed in the second cavity 202. Referring to fig. 2, 3 and 18, the first rotor assembly 50 includes a first rotor 51 and a second rotor 52, the first rotor 51 is sleeved on the outer periphery of the second rotor 52, the first rotor 51 includes a plurality of internal teeth, the second rotor 52 includes a plurality of external teeth, a hydraulic pressure chamber 2011 is formed between the internal teeth of the first rotor 51 and the external teeth of the second rotor 52, and it can be known that the hydraulic pressure chamber 2011 is a part of the first chamber 201 or the hydraulic pressure chamber is communicated with the first chamber 201. Referring to fig. 7, the stator assembly 40 includes a stator core 41 and windings 42, when the electronic oil pump works, the electronic control board 80 can output a current varying according to a predetermined rule to the windings 42, so that the stator assembly 40 generates a varying excitation magnetic field, the second rotor assembly 60 rotates under the action of the excitation magnetic field, and the second rotor assembly 60 can directly or indirectly drive the first rotor assembly 50 to rotate, specifically, the electronic oil pump includes a pump shaft 70, the pump shaft 70 is fixedly connected to the second rotor 52 of the first rotor assembly 50, and the pump shaft 70 is also fixedly connected to the second rotor assembly 60, therefore, when the second rotor assembly 60 rotates under the action of the excitation magnetic field, the pump shaft 70 can drive the second rotor 52 to rotate so as to realize the rotation of the first rotor assembly 50, and thus the volume of a hydraulic cavity 2011 formed by the first rotor assembly 50 changes, or the pressure in the hydraulic cavity 2011 formed by the first rotor assembly 50 changes, so that the working medium is introduced into and discharged from the hydraulic chamber 2011 formed by the first rotor assembly 50, and the working medium can flow. Further, referring to fig. 1, the electronic oil pump further includes an inlet and an outlet 104, the working medium can enter the hydraulic chamber 2011 through the inlet, and the working medium can leave the hydraulic chamber 2011 through the outlet; because a certain eccentricity exists between the first rotor 51 and the second rotor 52, when the second rotor 52 rotates, part of external teeth of the second rotor 52 are meshed with part of internal teeth of the first rotor 51, so as to drive the first rotor 51 to rotate, during one rotation of the first rotor 51 and the second rotor 52, the internal volume of the hydraulic chamber 2011 changes, specifically, when the first rotor assembly 50 rotates to a certain angle from the beginning, the volume of the hydraulic chamber 2011 gradually increases, so as to form a partial vacuum, the working medium is sucked into the hydraulic chamber 2011 from the inlet, and when the first rotor 51 and the second rotor 52 continue to rotate, the volume of the hydraulic chamber 2011 originally filled with the working medium gradually decreases, the working medium is squeezed, so that the working medium entering the hydraulic chamber 2011 is squeezed out to the outlet, so as to generate flowing power.

Referring to fig. 1 to 3, 16 and 17, the pump housing includes a first housing 10, a second housing 20 and a third housing 30, the second housing 20 is located between the first housing 10 and the third housing 30 along the axial direction of the electronic oil pump, and for convenience of describing the positional relationship of the components of the electronic oil pump, the first housing 10 is located above the second housing 20, and the third housing 30 is located below the second housing 20. The first shell 10 and the second shell 20 are relatively and fixedly connected to form a first cavity 201, and the second shell 20 and the third shell 30 are relatively and fixedly connected to form a second cavity 202; specifically, the first casing 10 and the second casing 20 are fixedly connected by screws or bolts, so as to facilitate the detachment and installation of the electronic oil pump and also facilitate the maintenance of the first rotor assembly 50 of the electronic oil pump, although the first casing 10 and the second casing 20 may also be connected by other methods, such as plugging, clamping, and the like, and will not be described in detail. The second housing 20 is fixedly connected with the third housing 30, specifically, the second housing 20 is connected with the third housing 30 through screws or bolts, which is beneficial to the disassembly and assembly of the electronic oil pump on the one hand, in this embodiment, the electronic control board 80 is arranged in the inner cavity formed by the third housing 30, which is also beneficial to the maintenance of the electronic control board 80 in the electronic oil pump; the reliability of the connection between the second casing 20 and the third casing 30 can be increased, and the second casing 20 and the third casing 30 can be connected by plugging, clipping, or other connection methods, which will not be described in detail. In the solution of the present invention, the axial direction of the electronic oil pump refers to the extending direction of the pump shaft 70, or the axial direction of the electronic oil pump 1 is perpendicular to the rotation direction of the first rotor assembly 50.

In the present embodiment, the first housing 10 includes the first main body portion 11 and the extended portion 12, the extended portion 12 extends radially from the first main body portion 11, and the height of the extended portion 12 is smaller than the height of the first main body portion 11 in the axial direction of the electronic oil pump. The outer extension portion 12 comprises at least two through holes, the through holes of the outer extension portion 12 are distributed along the circumferential array of the first shell 10, and screws pass through the through holes of the outer extension portion and are matched with threaded holes arranged in the second shell 20 to fasten the first shell 10 and the second shell 20. Referring to fig. 4, the first housing 10 further has an inlet and an outlet 104, a first communicating chamber 105 and a second communicating chamber 106, the first communicating chamber 105 is disposed between the inlet and the hydraulic chamber 2011, the inlet is communicated with the first communicating chamber 105, and the first communicating chamber 105 can be communicated with the hydraulic chamber 2011; set up second intercommunication chamber 106 between export 104 and the hydraulic pressure chamber 2011, export and second intercommunication chamber 106 intercommunication, second intercommunication chamber 106 can communicate with hydraulic pressure chamber 2011, and the electronic oil pump sets up first intercommunication chamber 105 and second intercommunication chamber 106 and buffers working medium, is favorable to improving vibration and noise.

In the present embodiment, the inlet is formed in the first main body 11 of the first casing 10, and the inlet is substantially circular, where "substantially circular" means that the roundness is within 1 mm, but the inlet may have other shapes, such as an oval shape, a square shape, and the like. First communicating chamber 105 is formed in the lower terminal surface of first casing 10, wherein the lower terminal surface of first casing 10 and the contact setting of second casing 20, first communicating chamber 105 is arc approximately, the flow cross-sectional area of first communicating chamber 105 increases from the one end of first communicating chamber 105 to the other end of first communicating chamber 105 gradually, the import corresponds the setting with the one end that the flow cross-sectional area of first communicating chamber 105 is great relatively, so cooperate, be favorable to hydraulic pressure chamber 2011 to form certain vacuum in the one end that the flow cross-sectional area of first communicating chamber 105 is great relatively, be favorable to the suction of working medium. Furthermore, the inlet is also substantially arc-shaped, the shape of the inlet is substantially the same as that of the first communicating cavity 105, the inlet corresponds to the first communicating cavity 105 up and down, and the inlet and the first communicating cavity 105 are matched in such a way that the hydraulic cavity 2011 can form a certain vacuum degree at the tail, which is not only beneficial to suction of working media, but also beneficial to machining and forming of the first housing 10, and can also relatively reduce the weight of the first housing 10. In another embodiment, referring to fig. 1 and 2 in particular, the inlet of the electronic oil pump includes a first inlet 101, a second inlet 102, and a third inlet 103, wherein the first inlet 101 is disposed to communicate with the second inlet 102, the first inlet 101 is disposed to communicate with the third inlet 103, the second inlet 102 is disposed to communicate with the first communicating cavity 105, and the third inlet 103 is disposed near the center of the first housing 10.

The outlet of the electronic oil pump 1 is formed in the outer extension portion 12 of the first housing 10, the second communicating chamber 106 is also formed in the lower end face of the first housing 10, and the flow cross-sectional area of the joint of the outlet and the second communicating chamber 106 is larger than the flow cross-sectional area of the other portion of the second communicating chamber 106, so that the working medium entering the second communicating chamber 106 from the hydraulic chamber 2011 can be discharged as soon as possible. The second communicating chamber 106 and the first communicating chamber 105 are substantially circumferentially distributed in the first housing 10, which is advantageous for utilizing the entire circumference of the electronic oil pump and for increasing the working pressure of the working medium passing through the electronic oil pump. In another technical scheme of the invention, the outlet is arranged on the upper surface of the extension portion 12, so that the outlet and the inlet are both arranged along the axial direction of the electronic oil pump, that is, the inlet and the outlet are arranged in the same direction of the electronic oil pump, the oil inlet direction of the working medium is approximately parallel to the oil outlet direction, only one sealing portion needs to be arranged between the working medium and the transmission system due to the arrangement, and the structure is simple. In another aspect of the present invention, the outlet is disposed on a side wall of the outer extension portion 12, or the side wall of the outer extension portion 12 and a side wall of the second housing 20 form the outlet, or the outlet is disposed on a side wall of the second housing 20, such that the inlet and the outlet are disposed substantially perpendicular to each other, and the side wall of the first main body portion 11 is disposed with a first groove, referring to fig. 1, the electronic oil pump further includes a first sealing ring, specifically, the first sealing ring is disposed in the first groove of the first housing 10, and when the electronic oil pump is installed in an automobile transmission or an electric drive unit of an automobile, such an arrangement is beneficial to isolating a low-pressure working medium at the inlet side from a high-pressure working medium at the outlet side.

Referring to fig. 2, 3, 16 and 17, the second housing 20 includes a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 are integrally formed, a radial extending direction of the first portion 21 is perpendicular to the pump shaft 70, the second portion 22 forms a side wall of the electronic oil pump, it can be known that the radial extending direction of the second portion 22 is substantially perpendicular to the extending direction of the first portion 21, in this embodiment, the first portion 21 is disposed at a middle upper portion of the second housing 20, an upper end surface of the second portion 22 is in contact with a lower end surface of the first housing 10, the first housing 10 and the first portion 21 are detachably connected, a lower end surface of the second portion 22 is in contact with the third housing 30, or a sealing ring is disposed between the lower end surface of the second portion 22 and the third housing 30, the second portion 22 and the third housing 30 are detachably connected, such that the first portion 21 relatively isolates the first cavity 201 from the second cavity 202, that is, the first housing 10 and the second housing 20 form a first chamber 201 therebetween, specifically, the first chamber 201 is located between the first portion 21 and the first housing 10, and the second housing 20 and the third housing 30 form a second chamber 202 therebetween, specifically, the second chamber 202 is located between the first portion 21 and the third housing 30, and it can be known that the first chamber 201 is located at an upper side of the first portion 21, and the second chamber 202 is located at a lower side of the first portion 21. The first part 21 and the second part 22 are integrally formed, so that the structure can ensure the sealing performance of the joint of the second part 22 and the first part 21, can prevent the working medium in the first cavity 201 from leaking at the joint of the first part 21 and the second part 22, and has simple structure.

In the second embodiment of the second housing (not shown), the second housing 20 includes the first portion 21 instead of the second portion, and in this embodiment, the first housing 10 is connected to the first portion 21, and the third housing 30 is connected to the first housing 10 through the first portion 21, so that the first cavity 201 is formed between the first housing 10 and the first portion 21, and the second cavity 202 is formed between the third housing 30 and the first portion 21, which is advantageous to simplify the structure.

The upper surface of the first portion 21 supports the first rotor assembly 50, and since the second rotor 52 is fixedly disposed with the pump shaft 70, the first portion 21 can prevent the stator assembly 40 and the second rotor assembly 60 from moving due to attraction, i.e., axial positioning of the second rotor assembly 60 is achieved. Referring to fig. 3, 5 and 16, the upper surface of the second portion 22 is formed with a first recess 211 and/or a second recess 212, the first recess 211 includes a first head portion 2111 and a first tail portion 2112, the width of the first recess 211 at the body portion of the first head portion 2111 is smaller than the width at the body portion of the first tail portion 2112, specifically, in the present embodiment, the width of the first recess 211 is gradually increased from the body portion of the first head portion 2111 to the body portion of the first tail portion 2112, such that the volume of the hydraulic chamber 2011 between the first rotor 51 and the second rotor 52 is gradually increased to form a partial vacuum, and the working medium is sucked into the hydraulic chamber 2011 from the inlet port, where "the body portion of the first head portion 2111" refers to the feature occupying the main portion in the first head portion 2111, where "the feature occupying the main portion" refers to the feature occupying the area of the first head portion 2111 being more than 60%, and "the tail portion of the first tail portion 2112" refers to the feature occupying the main portion in the first head portion 2112, here, "the feature occupying the major portion" means that the feature occupies 60% or more of the area of the first tail portion 2112; the first notch 211 further includes a first sidewall 2113, specifically, in this embodiment, the first notch 211 includes two first sidewalls 2113, and the two first sidewalls 2113 are substantially opposite to each other, wherein the first sidewall 2113 connects one end of the first head 2111 and one end of the first tail 2112, and the other first sidewall 2113 connects the other end of the first head 2111 and the other end of the first tail 2112, and the above-mentioned "width of the first notch 211" refers to a distance between the two first sidewalls 2113 of the first notch 211; the second groove 212 includes a second head portion and a second tail portion, the second head portion is closer to the first head portion 2111 of the first groove 211 than the second tail portion, the width of the second groove 212 at the body portion of the second head portion is larger than the width at the body portion of the second tail portion, specifically, in the present embodiment, the width of the second groove 212 is gradually smaller from the body portion of the second head portion to the body portion of the second tail portion, the arrangement is such that the volume of the hydraulic pressure chamber 2011 between the first rotor 51 and the second rotor 52 is gradually reduced, the working medium is squeezed, and thus the working medium entering the hydraulic pressure chamber 2011 is squeezed out to the outflow port, where "the body portion of the second head portion" refers to a feature occupying a major portion in the second head portion, where "the feature occupying a major portion" refers to a feature occupying an area of the second head portion of 60% or more, where "the body portion of the second tail portion" refers to a feature occupying a major portion in the second tail portion, here, "the feature occupying the main portion" means that the feature occupies an area of the second tail portion or more; the second groove 212 further includes a second sidewall, specifically, in this embodiment, the second groove 212 includes two second sidewalls, the two second sidewalls are disposed approximately oppositely, one of the second sidewalls is connected to one end of the second head portion and one end of the second tail portion, the other second sidewall is connected to the other end of the second head portion and the other end of the second tail portion, and the above-mentioned "width of the second groove 212" refers to a distance between the two second sidewalls of the second groove 212; in this embodiment, the width of the second groove 212 and the width of the first groove 211 are changed, so that when the first rotor 51 and the second rotor 52 rotate, the volume of the hydraulic cavity 2011 formed between the first rotor 51 and the second rotor 52 is changed, and thus the pressure of the working medium entering the hydraulic cavity 2011 is changed, and the working medium can be smoothly pumped out. The first recess 211 and the second recess 212 are substantially circumferentially distributed on the upper surface of the first portion 21, which facilitates the utilization of the entire circumference of the first portion 21 and the increase of the working pressure of the working medium passing through the electronic oil pump. It is noted that at least part of first recess 211 is disposed opposite first communicating chamber 105, or, in the axial direction of the pump, the projection of first communicating chamber 105 on the upper surface of first portion 21 coincides with at least part of first recess 211, and at least part of second recess 212 is disposed opposite second communicating chamber 106, or, in the axial direction of the pump, the projection of second communicating chamber 106 on the upper surface of first portion 21 coincides with at least part of second recess 212, which facilitates the rapid entry and exit of the working medium into and out of hydraulic chamber 2011.

In the axial direction of the electronic oil pump, the second rotor assembly 60 and the stator assembly 40 are arranged with a gap, and the second rotor assembly 60 is adjacent to the first portion 21 relative to the stator assembly 40, i.e., the second rotor assembly 60 is located between the stator assembly 40 and the first portion 21. Referring to fig. 6-14, the stator assembly 40 includes a stator core 41, a bobbin disposed on at least a portion of an outer surface of the stator core 41, and a winding 42 made of an insulating material for separating the stator core 41 and the winding 42. The stator core 41 includes a base 411 and a first protrusion 413, and the first protrusion 413 extends from the upper surface 401 of the base toward the second rotor assembly 60, wherein the upper surface 401 of the base faces the second rotor assembly 60, and the lower surface of the base 411 faces the electric control board 80. The base 411 and the first protrusion 413 may be provided separately and then fixed by welding, crimping, or riveting, or the first protrusion 413 and the base 411 may be integrally formed. In the present embodiment, the stator core 41 includes six first protrusions 413, the six first protrusions 413 are equally spaced along the circumferential direction of the base 411, and the distances from the first protrusions 413 to the center of the base 411 are substantially equal. The lateral cross-section of the first boss 413 may be circular, square, or triangular. The winding 42 is wound on the bobbin and then sleeved on the first protrusion 413, or the winding is supported by the first protrusion, it can be known that the axial direction of the winding 42 is substantially parallel to the axial direction of the electronic oil pump. In one aspect of the present invention, the base 411 may be a cylinder, wherein the height of the base 411 is relatively smaller than the diameter of the base 411. In another embodiment, referring to fig. 8, the base 411 includes a base main body 4111 and sectors 4112, the sectors 4112 are integrally formed with the base main body 4111, the sectors are circumferentially distributed on a sidewall of the base main body, the sectors 4112 extend from the sidewall of the base main body 4111 in a radial direction, adjacent sidewalls of each sector may be partially disposed in contact or non-contact, and the first protrusion 413 extends from an upper surface of the sector 4112 in an axial direction of the electronic oil pump. This arrangement is advantageous for reducing the weight of the stator assembly 40, allowing for the passage of working medium between adjacent sectors, and also for the flow of working medium around the stator assembly 40. In the technical scheme of the invention, the vertical included angle is 85-95 degrees, and the parallel included angle is-5 degrees and 5 degrees.

The side wall 402 of the base 411 is further formed with first recesses 403, the first recesses 403 penetrating the upper surface 401 of the base 411 and the lower surface of the base 411, the number of the first recesses 403 being twice the number of the first protrusions 413. Accordingly, the winding wire forming the winding has a winding end portion and a winding wire connection portion 415, the winding wire connection portion 415 is integrally formed with the winding end portion, and the winding wire connection portion 415 is placed in the first recess 403, wherein the cross-sectional area of the first recess 403 is larger than the radial cross-sectional area of the winding wire connection portion, so that a passage through which the working medium flows is formed between the first recess and the inner wall of the second housing 20. In another embodiment, the base 411 may be provided with a through hole (not shown), the through hole penetrates through the upper surface 401 of the base 411 and the lower surface of the base 411, a gap exists between the winding connection portion 415 and the through hole, a channel for circulating the working medium is formed between the through hole and the winding connection portion 415, the working medium may enter a space between the spacer 90 and the stator assembly 40 through the channel, which is beneficial to heat dissipation of the stator assembly 40, and of course, the through hole and the first recess may be sealed, which is beneficial to preventing the working medium from penetrating into the electronic control board. The base 411 further includes a clamping portion 414, the clamping portion 414 extends from the lower surface of the base 411 toward the electric control board 80, the winding end is embedded into the clamping portion 414, and the clamping portion 414 is fixed to one end of the connection terminal of the spacer 90 and contacts with the winding end, so as to realize signal connection and/or electrical connection between the connection terminal and the winding 42. It can be appreciated that the number of the snap-in portions 414 is the same as the number of the first recesses.

The electronic oil pump includes a radial positioning portion including a first flange portion 222 and a first recessed portion into which the first flange portion 222 extends to achieve radial positioning of the stator assembly 40. In one embodiment, the inner wall of the second housing 20 is formed with at least one first flange portion 222, the first recessed portion is the first recessed portion 403 of the base 411, and the first flange portion 222 of the second housing 20 is disposed corresponding to the first recessed portion 403 of the base 411 to form the radial positioning of the stator core 41. In other embodiments, the side wall of the base 411 is further formed with a second recess portion provided in correspondence with the first flange portion of the second housing 20 to form a radial positioning of the stator core 41. It is understood that the side wall of the base 411 may also form the first flange portion, and the inner wall of the second housing 20 forms the first recess portion, which are cooperatively disposed to realize the radial positioning of the stator core 41. Referring to fig. 17, the second housing 20 further includes a first step portion 221, the first step portion 221 includes a first step surface 2212 and a second step surface 2211, the first step surface and the second step surface are substantially perpendicular to each other, the first step surface contacts with the upper surface 401 of the base, and the second step surface is in clearance fit with the side wall of the base 411 to facilitate the installation of the stator assembly 40. Alternatively, the first stepped portion has a screw hole having an opening at a first stepped surface, the base 411 includes a first hole having openings at both upper and lower surfaces of the base 411, and a screw passes through the first hole and is engaged with the screw hole of the first stepped portion to fasten the stator assembly and the second housing 20.

Referring to fig. 2 and 3, the second rotor assembly 60 includes a rotor core 61, in this embodiment, the rotor core 61 is a flat cylinder, and defines a first surface, the first surface is perpendicular to the axial direction of the electronic oil pump, and along the axial direction of the electronic oil pump, since the second rotor assembly 60 rotates circumferentially, the projection of the winding 42 on the first surface is located in the projection of the rotor on the first surface, and therefore, the winding 42 is an effective edge, which is beneficial to enhancing the driving capability of the second rotor assembly 60. Like this, the second rotor subassembly can all cut the magnetic induction line, is favorable to increasing drive power. Second rotor subassembly still includes permanent magnet 62, rotor core 61 and the fixed setting of permanent magnet 62, the permanent magnet is located between stator module 40 and the rotor core, along the axial direction of electron oil pump, there is certain clearance between permanent magnet 62 and the stator module 40, in order to make things convenient for the rotation of rotor subassembly, that is, along the axial direction of electron oil pump, the clearance sets up between second rotor subassembly 60 and the stator module 40, or said differently, along the axial direction of electron oil pump, second rotor subassembly 60 is greater than zero with stator module 40's distance. In this embodiment, the second rotor assembly 60 includes four permanent magnets circumferentially distributed on the rotor core and arranged at equal intervals; in addition, the rotor core is placed in a permanent magnet groove, the shape of the groove of the rotor core is the same as that of the permanent magnet, and the fixing mode of the rotor core and the permanent magnet comprises gluing or clamping and the like.

The rotor core comprises a matching hole, and the matching hole is close to the center of the rotor core; the pump shaft 70 includes the cooperation portion, and wherein the cooperation portion of pump shaft 70 includes first cooperation portion and second cooperation portion, and pump shaft 70 passes the mating holes, and the second cooperation portion and the mating holes interference fit of pump shaft 70, therefore when rotor core rotated, can drive pump shaft 70 and rotate. Of course, the second fitting portion of the pump shaft 70 may also be provided as a non-rotating body, and accordingly, the shape of the fitting hole is the same as that of the second fitting portion of the pump shaft 70. In other embodiments, the pump shaft 70 may also include a first pump shaft and a second pump shaft, wherein one end of the first pump shaft is engaged with the stator assembly 40, the other end of the first pump shaft is engaged with the engagement hole of the rotor core, one end of the second pump shaft is engaged with the engagement hole of the rotor core, and the other end of the second pump shaft is engaged with the second rotor assembly 60.

Referring to fig. 6-17, 22 and 23, the electronic oil pump includes a first supporting portion 412 and a second supporting portion 213, the first supporting portion 412 and the second supporting portion 213 are spaced apart from each other, and the first supporting portion 412 and the second supporting portion 213 can provide support for the pump shaft 70 to improve stability of the pump shaft 70, where the support includes the first supporting portion capable of radially limiting the pump shaft and/or axially limiting the pump shaft. Specifically, the first support part 412 is disposed near the center of the base 411, and the first end 72 of the pump shaft 70 is supported by the first support part 412. In the present embodiment, the first supporting part 412 forms a recess from the upper surface of the base 411 toward the lower surface of the base 411, and specifically, the first supporting part 412 may be a groove, wherein an opening of the groove is located on the upper surface of the base 411; or, along the axial direction of electronic oil pump, first supporting part 412 runs through base 411, first supporting part 412 is provided with the opening respectively at the upper surface of base 411 and the lower surface of base 411, specifically, first supporting part 412 can be the through-hole, first tip 72 stretches into first supporting part 412, the first tip 72 of pump shaft and the inner wall clearance fit of first supporting part 412, when pump shaft 70 rotates like this, be favorable to reducing base 411 to the friction of rotating shaft, in addition, there is the clearance between pump shaft 70 and the first supporting part 412, working medium can get into first supporting part 412, can play certain lubricated effect to pump shaft 70, thereby be favorable to improving the life of pump shaft 70. In another embodiment of the present invention, referring to fig. 9, the first supporting portion 412 is formed to be convex from the upper surface of the base 411 toward the second rotor assembly 60, a recess is formed on the end surface of the first end portion, and the first supporting portion 412 extends into the first end portion. Specifically, the first supporting portion 412 is a circular convex column, and a circular groove is formed on an end surface of the first end portion. In a third technical solution of the present invention, referring to fig. 14, the first supporting portion 412 forms a protrusion from the upper surface of the base 411 toward the second rotor assembly 60, the first supporting portion has a protrusion end surface, the protrusion end surface is adjacent to the second rotor assembly relative to the other portion of the first supporting portion, the protrusion end surface forms a recess toward the lower surface of the base, and the first end portion extends into the first supporting portion. The first supporting part is a bulge, and the length of the pump shaft is favorably reduced. Further, the first supporting portion 412 further includes a first extending portion 4121, the first extending portion 4121 is integrally formed with the base 411, the first end portion extends into the first extending portion 4121, the first end portion 72 of the pump shaft is in clearance fit with at least a portion of the first extending portion 4121, for example, the first supporting portion 412 is a groove or a through hole, the first extending portion extends from the upper surface of the base 411 toward the second stator assembly 40, and it can be known that the first extending portion 4121 has a hollow structure; and/or the first extension extends from the lower surface of the base 411 toward the third housing 30, in which case the center of the first extension 4121 may be a blind hole or a through hole. The first support part 412 is provided with the first extension part 4121, which relatively increases the axial length of the first support part 412, and is beneficial to improving the stability of fixing the pump shaft 70. Further, referring to fig. 23, the first supporting portion 412 further includes ribs 4122, and the ribs 4122 are circumferentially arrayed or continuously distributed, and specifically, the ribs 4122 connect the outer wall of the first extending portion 4121 and the upper surface and/or the lower surface of the base portion 411, so that the mechanical strength of the first extending portion is ensured, and the first extending portion is not easily deformed. When the first support part 412 forms a protrusion from the upper surface of the base part 411 toward the second rotor assembly 60, the reinforcing ribs connect the outer wall of the first support part 412 and the upper surface of the base part 411, thereby making the stability of the first support part 412. In the present embodiment, the shape of the rib is substantially triangular, but may be other shapes, such as rectangular or trapezoidal.

Referring to fig. 16 and 17, the second supporting portion 213 is disposed near the center of the first portion 21, the second supporting portion 213 penetrates through the upper surface of the first portion 21 and the lower surface of the first portion 21, the first matching portion of the pump shaft is supported by the second supporting portion 213, the pump shaft 70 penetrates through the second supporting portion 213, and the first matching portion of the pump shaft 70 is in clearance fit with at least a portion of the second supporting portion 213. The second supporting portion 213 has a first through hole, and the inner diameters of the second supporting portions 213 may be the same or different along the axial direction of the electronic oil pump, but the inner diameter of the second supporting portion 213 is larger than the first fitting portion of the pump shaft 70, which is beneficial to the working medium entering the second supporting portion 213, the lubrication of the pump shaft 70, and further the rotation of the pump shaft 70. In addition, since the opening of the second support portion 213 in the upper surface of the first portion 21 is smaller than the outer diameter of the second rotor 52, the first portion 21 can restrict axial movement of the rotor assembly due to suction of the rotor, thereby improving stability of the electronic oil pump. Further, the second supporting portion 213 further includes a second extending portion, the second extending portion can directly or indirectly support the second supporting portion 213, the second extending portion is located in the second cavity 202, the second extending portion forms an annular protrusion from the lower surface of the first portion 21 toward the second rotor assembly 60, and the second extending portion and the second portion 22 are integrally formed. The inner circumferential surface of the second support portion 213 is disposed in contact with the outer circumference of the pump shaft 70, and the inner circumferential surface of the second support portion 213 is provided with a lubrication groove to improve lubrication. The electronic oil pump further includes an oil seal located at the second support portion 213, an inner circumference of the oil seal contacts with an outer circumferential surface of the pump shaft 70, and an outer circumference of the oil seal contacts with an inner wall of the second support portion 213, so as to improve sealability between the first chamber 201 and the second chamber 202.

More closely, the electronic oil pump further includes a first bearing and/or a second bearing, and specifically, the first support part 412 is provided with the second bearing, and the second support part 213 is provided with the first bearing, and the first end of the pump shaft 70 is supported at the first support part 412 by the second bearing, and specifically, when the first support part 412 is a through hole or a groove, an inner circumference of the second bearing is relatively fixed to an outer circumference of the pump shaft 70, and an outer circumference of the second bearing is relatively fixed to an inner circumference of the first support part 412. When the first support part 412 is formed to be convex from the upper surface of the base 411 toward the second rotor assembly 60, a recess is formed at the end surface of the first end part, the inner circumference of the second bearing is fixed to the outer circumference of the first support part 412, and the inner circumference of the second bearing is fixed to the outer circumference of the first end part. Similarly, the first bearing is disposed in the second support 213, and an inner circumference of the first bearing contacts an outer circumference of the pump shaft 70 and an outer circumference of the first bearing contacts an inner circumference of the second support 213. The first bearing and the second bearing can be rolling bearings or sliding bearings, the requirements of abrasion and rotation precision can be met by adopting the sliding bearings for the medium-low speed electronic oil pump, and meanwhile, the cost can be reduced; for the high-speed electronic oil pump, the abrasion, the rotation precision and the bearing capacity of the bearing are key influence factors during the bearing type selection, and the rolling bearing is adopted as much as possible.

Referring to fig. 2, 3 and 20, the electronic oil pump further includes a spacer 90, at least a portion of the spacer 90 is disposed between the stator assembly 40 and the electric control board 80, in this embodiment, the stator assembly 40 is located on one side of an upper surface of the spacer 90, the electric control board 80 is located on one side of a lower surface of the spacer 90, and the spacer 90 may be disposed on the third casing 30 and fixed to the third casing 30 in a snap-fit manner, or disposed on the second casing 20 and fixed to the second casing 20 in a snap-fit manner; the partial spacer 90 may be disposed between the second casing 20 and the third casing 30, and is pressed and fixed by the second casing 20 and the first casing 10. The electronic oil pump 1 comprises a connecting terminal 91, wherein the connecting terminal 91 penetrates through the upper surface and the lower surface of at least part of the partition 90 and is fixedly connected with the partition 90, one end of the connecting terminal 91 is connected with the stator assembly 40, specifically, one end of the connecting terminal 91 is fixedly connected with a clamping part of the stator assembly 40 and is in signal connection and/or electric connection with a winding end part of the stator assembly 40, and the other end of the connecting terminal 91 is fixedly connected with the electric control board 80 and is in signal connection and/or electric connection with the electric control board; since the connection terminal 91 penetrates through at least a part of the spacer 90 and is fixedly connected with the spacer 90, deformation of the connection terminal is prevented when the connection terminal is connected with the stator assembly 40 and the electric control board 80, and reliability of connection between the connection terminal and the stator assembly 40 and the electric control board 80 is improved. The fixing manner of the connection terminal 91 and the spacer 90 includes: the connecting terminal 91 is an insert, and the connecting terminal 91 and the spacer 90 are integrally injection molded; or the connection terminal 91 passes through a through hole of the spacer 90 and is fixed by glue. The partition 90 includes a groove 901, the groove 901 is disposed on the outer peripheral side wall of the partition 90, the electronic oil pump includes a sealing member disposed in the groove of the partition 90, and the working medium can be prevented from entering the space where the electronic control board 80 is located along the side wall of the partition 90 by the partition 90 and the sealing member.

The third housing 30 and the second housing 20 are connected by screws, but may be connected by other connection methods, such as plugging, clipping, or welding. The third housing 30 is further formed with a mounting hole 321, the mounting hole 321 being for connection with a transmission case or a driving unit, and the third housing 30 includes two mounting holes. Third casing 30 still forms there is the heat dissipation portion, the heat dissipation portion is including the heat dissipation muscle, the integrative injection moulding of heat dissipation muscle and third casing 30, in this embodiment, set up the heat dissipation muscle as much as possible on third casing 30 to increase heat radiating area is favorable to the heat dissipation of circuit board, in this embodiment, the transverse section shape of heat dissipation muscle is the rectangle, the transverse section shape of heat dissipation muscle of course also can be other shapes, such as other shapes such as trapezoidal, triangle-shaped, arc.

A second embodiment of the electronic oil pump will be described, referring to fig. 2, and only the differences from the first embodiment will be described. The first portion 21 comprises a first channel 211 ', or further, the first groove 211 penetrates the first portion 21 to form a first channel 211 ', the first channel 211 ' penetrates the upper surface and the lower surface of the first portion 21, the first channel 211 ' can communicate the first chamber 201 and the second chamber 202, and in more detail, the first channel 211 ' can communicate the hydraulic chamber 2011 and the second chamber 202. The first channel 211 'has a first communication port portion 2114 formed in the upper surface of the first portion 21, the first communication port portion forming a first communication port, the first channel 211' has a second communication port portion formed in the lower surface of the first portion 21, the second communication port portion forming a second communication port; along the axial direction of the electronic oil pump, the projection of the first communication cavity on the upper surface of the first portion 21 overlaps with at least part of the first communication port portion 2114, so that when the first rotor assembly 50 operates, the first communication port portion 2114 can be used as a discharge port to enable the working medium in the second cavity 202 to flow into the first cavity 201, and then the working medium flows between the first cavity 201 and the second cavity 202, and the heat dissipation of the stator assembly 40 is facilitated. Further, the first communicating port portion includes a first header portion and a first foot portion, and the width of the first communicating port portion 2114 at the body portion of the first header portion is smaller than that at the body portion of the first foot portion, specifically, in this embodiment, the width of the first recess 211 gradually increases from the body portion of the first head portion to the body portion of the first foot portion, the arrangement is such that the volume of the hydraulic chamber 2011 between the first rotor 51 and the second rotor 52 is gradually increased to form a partial vacuum, working medium is drawn into the hydraulic chamber 2011 from the inlet port, the term "main body portion of the first header portion" as used herein means a feature that occupies a major portion of the first header portion, and the term "main body portion" as used herein means a feature that occupies 60% or more of the area of the first header portion, here, the "main body portion of the first foot portion" means a feature occupying a major portion in the first foot portion, and the "feature occupying a major portion" means that the feature occupies 60% or more of the area of the first foot portion; the first communication port 2114 further includes two first sides, and in this embodiment, the first communication port 2114 includes two first sides, the two first sides are substantially opposite to each other, the first side connects one end of the first header portion and one end of the first foot portion, the other first side connects the other end of the first header portion and the other end of the first foot portion, and the "width of the first communication port 2114" refers to a distance between the two first sides of the first communication port 2114. The upper surface of the first portion 21 also includes a second recess 212, and the second recess 212 is the same as the first embodiment and will not be described in detail. The first communication port and the second groove 212 are substantially circumferentially distributed on the upper surface of the first portion 21, which facilitates the utilization of the entire circumference of the first portion 21 and the increase of the working pressure of the working medium passing through the electronic oil pump. It can be known that at least part of the first communication port is arranged opposite to the first communication chamber 105, or, in the axial direction of the electronic oil pump, the projection of the first communication chamber 105 on the upper surface of the first portion 21 coincides with at least part of the first communication port; at least part of the second groove 212 is arranged opposite to the second communication cavity 106, or, along the axial direction of the electronic oil pump, the projection of the second communication cavity 106 on the upper surface of the first portion 21 coincides with at least part of the second groove 212; this facilitates rapid ingress and egress of working medium into and out of the hydraulic chamber 2011.

Referring to fig. 2, 15 and 21, the pump shaft 70 includes a first end surface and a second end surface, the first end surface and the second end surface are substantially parallel, the first end surface is relatively close to the first casing 10, and the second end surface is relatively close to the third casing 30. In this embodiment, the electric pump includes a second channel 71, and the second channel 71 extends axially from the first end surface to the second end surface, that is, the second channel 71 penetrates the first end surface and the second end surface, specifically, the second channel 71 is provided with a first opening 721 at the first end surface, and the second channel 71 is provided with a second opening 731 at the second end surface. In one embodiment, along the axial direction of the electronic oil pump, the distance between the upper end surface of the second rotor 52 and the lower end surface of the first housing 10 is greater than 1 mm, the third inlet 103 and the second opening 731 are oppositely arranged or staggered, the working medium enters the first cavity 201 through the third inlet 103 and then enters the second channel 71 through the second opening, so that part of the working medium in the first cavity 201 can enter the second cavity 202 through the second channel 71, and the second channel 71 is arranged on the pump shaft 70, which is beneficial to simplifying the processing process and reducing the processing cost. In another embodiment, the third inlet 103 is opposite to the second opening 731, the upper end surface of the second rotor 52 is in clearance fit with the lower end surface of the first housing 10, or the distance between the upper end surface of the second rotor 52 and the lower end surface of the first housing 10 along the axial direction of the electronic oil pump is greater than zero and less than 1 mm, and the working medium of the third inlet 103 can enter the second cavity 202 through the second channel 71, which is favorable for shortening the time for a part of the working medium to enter the second cavity 202, thereby being favorable for improving the cooling efficiency of the stator assembly 40. The second inlet 102 is formed in the first housing 10, so that the weight of the electronic oil pump is reduced, and the amount of the working medium entering the second cavity 202 can be increased, which is beneficial to accelerating the heat dissipation of the stator assembly 40. Referring to fig. 3, the second cavity 202 includes a first sub-cavity 2021 and a second sub-cavity 2022, wherein the first sub-cavity 2021 is located on the upper surface side of the base 411, and the second sub-cavity 2022 is located on the lower surface side of the base 411. Referring to fig. 22, corresponding to the second channel 71 of the pump shaft 70, along the axial direction of the electronic oil pump, the first supporting portion 412 penetrates through the base 411, the first supporting portion 412 is provided with openings on the upper surface and the lower surface of the base 411, respectively, the first end portion 72 extends into the first supporting portion 412, the first opening 721 is communicated with the second sub-cavity, and the second opening 722 of the pump shaft is communicated with the second sub-cavity 2012 through the second channel 71, which is favorable for the flow of the working medium in the second sub-cavity 2012 and the heat dissipation of the electronic oil pump.

Further, the first supporting portion 412 further includes a first extending portion 4121, the first extending portion 4121 is integrally formed with the base portion 411, the first end portion extends into the first extending portion 4121, and the first end portion of the pump shaft 70 is in clearance fit with at least a portion of the first extending portion. Specifically, in the axial direction of the electronic oil pump, a first support part 412 penetrates the base 411, the first support part forming openings at the upper and lower surfaces of the base, a first extension part extending from the lower surface of the base 411 toward the third housing 30 and/or a first extension part extending from the upper surface of the base 411 toward the second rotor assembly 60. In addition, the first supporting portion 412 further includes reinforcing ribs circumferentially arrayed or continuously distributed, and the reinforcing ribs connect the outer wall of the first extension portion 4121 and the upper surface and/or the lower surface of the base portion 411. The first support part 412 further includes a second bearing, an outer wall of which is fixed to an inner wall of the first support part 412, and an outer wall of the first end of the pump shaft 70 is fixed to an inner wall of the first bearing.

Referring to fig. 1 and 20, the electronic oil pump further includes a fourth inlet 105, the fourth inlet 105 is disposed between the second casing 20 and the third casing 30, and the fourth inlet 105 is communicated with the second sub-cavity 2022. Specifically, the third casing 30 includes claw portions 31, wherein the claw portions 31 extend toward the second casing 20 direction relative to the upper end face of the third casing 30, and the claw portions 31 are circumferentially arrayed along the upper end face of the third casing 30 and are arranged at intervals; the claw portion includes a claw portion main body 311 and a claw portion end portion 312, a distance from the claw portion end portion 312 to an axis of the electronic oil pump in an axial direction of the electronic oil pump is smaller than a distance from the claw portion main body 311 to the axis of the electronic oil pump, or in other words, in a radial direction of the electronic oil pump, the claw portion end portion is bent toward the second housing with respect to the claw portion main body; accordingly, the lower end portion of the second housing 20 is provided with a recessed portion, the outer diameter of the recessed portion of the second housing 20 is relatively smaller than the outer diameter of the other portion of the second housing 20, the claw end portion abuts against the recessed portion of the second housing 20, further fixing the second casing and the third casing, in addition, the end part of the claw part and the concave part of the second casing also have the function of limiting, the lower end surface of the second casing 20 and the upper end surface of the third casing 30 may be arranged with a gap therebetween, so that a fourth inlet 105 of the electronic oil pump is formed between the second casing 20 and the third casing 30, and the working medium can enter the second sub-chamber 2022 through the fourth inlet, since the hydraulic chamber 2011 can form a low pressure region, the working medium can be attracted to enter the second sub-chamber from the fourth inlet, enter the first sub-chamber 2021 through the gap between the stator assembly 40 and the inner wall of the second housing 20, and be discharged through the first passage 211' and the first chamber 201. This facilitates heat dissipation from the stator assembly 40, and the fourth inlet is adjacent to the electronic control board 80, which also facilitates heat dissipation from the electronic control board 80. It can be known that the second housing includes claw portions distributed in a circumferential array on a lower end surface of the second housing, each claw portion includes a claw portion main body and a claw portion end portion, the claw portion main body extends from the lower end surface of the second housing toward the claw portion end portion, and the claw portion end portion is bent toward the third housing relative to the claw portion main body along a radial direction of the electronic oil pump; the third casing is provided with the depressed part, and the claw tip and the depressed part butt of third casing, the lower terminal surface of second casing and the up end clearance setting of third casing are in order to form the fourth import, and the fourth import communicates with the second subchamber.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. An electronic oil pump comprising a pump shaft, a pump housing, a first rotor assembly, a stator assembly, and a second rotor assembly, the pump housing capable of forming a pump inner cavity, the pump inner cavity comprising a first cavity and a second cavity, the first rotor assembly disposed in the first cavity, the stator assembly and the second rotor assembly disposed in the second cavity; the pump housing includes a first housing, a second housing, and a third housing, the second housing being located between the first housing and the third housing in an axial direction of the electronic oil pump, defining that the first housing is located above the second housing; the second housing comprises a first part, the first cavity is positioned on the upper side of the first part, the second cavity is positioned on the lower side of the first part, and the radial extension direction of the first part is perpendicular to the pump shaft;

2. The electronic oil pump of claim 1, wherein a second end of the pump shaft is fixedly disposed with a second rotor of the first rotor assembly;

the second supporting part is arranged close to the center of the first part, the second supporting part penetrates through the upper surface of the first part and the lower surface of the first part, and the first matching part of the pump shaft is in clearance fit with at least part of the second supporting part;

or the second supporting part further comprises a first bearing, the outer wall of the first bearing is relatively fixed with at least part of the inner wall of the second supporting part, and the outer wall of the first matching part is relatively fixed with the inner wall of the first bearing.

3. The electronic oil pump of claim 1 or 2, wherein the first support is disposed proximate a center of the base, and the first end extends into the first support and is in clearance fit with at least a portion of the first support;

the first support part forms a recess from an upper surface of the base part toward a lower surface of the base part;

or along the axial direction of the electronic oil pump, the first supporting part penetrates through the base part, and the first supporting part is respectively provided with openings on the upper surface of the base part and the lower surface of the base part;

or the first supporting part forms a bulge from the upper surface of the base part towards the second rotor assembly, and the end surface of the first end part is formed with a recess;

or the first support part forms a protrusion from the upper surface of the base part towards the second rotor assembly, the first support part has a protrusion end surface, and the protrusion end surface is formed with a recess.

4. The electronic oil pump of claim 3, wherein the first support further comprises a first extension integrally formed with the base; the first support portion penetrates the base portion or forms a recess from an upper surface of the base portion toward a lower surface of the base portion in an axial direction of the electronic oil pump; the first extension extends from a lower surface of the base toward the third housing and/or the first extension extends from an upper surface of the base toward the second rotor assembly; the first end portion extends into the first extension portion, and the first end portion of the pump shaft is in clearance fit with at least part of the first extension portion.

5. The electronic oil pump of claim 4, wherein the first support portion further comprises a plurality of ribs distributed in a circumferential array or continuously, the plurality of ribs connecting the outer wall of the first extension portion and the upper surface of the base portion and/or the lower surface of the base portion.

6. The electronic oil pump of claim 3, wherein the first support portion is formed to be convex from the upper surface of the base portion toward the second rotor assembly, the first support portion further comprising reinforcing ribs that are distributed in a circumferential array or continuously, the reinforcing ribs connecting the outer wall of the first support portion and the upper surface of the base portion.

7. The electronic oil pump of claim 3, wherein the first support further comprises a second bearing;

along the axial direction of the electronic oil pump, the first supporting part penetrates through the base part or the first supporting part forms a recess from the upper surface of the base part to the lower surface of the base part, the outer wall of the second bearing is relatively fixed with the inner wall of the first supporting part, and the outer wall of the first end part of the pump shaft is relatively fixed with the inner wall of the second bearing;

or the first supporting part forms a bulge from the upper surface of the base part towards the second rotor assembly, the outer wall of the second bearing is relatively fixed with the depression of the first end part, and the inner wall of the second bearing is relatively fixed with the second supporting part;

or the first supporting part is protruded towards the second rotor assembly from the upper surface of the base part, the first supporting part is provided with a protruded end face, a recess is formed in the protruded end face, the outer wall of the second bearing is relatively fixed with the inner wall of the first supporting part, and the outer wall of the first end part of the pump shaft is relatively fixed with the inner wall of the second bearing.

8. The electronic oil pump according to claim 4, 5 or 6, wherein the first support portion further includes a second bearing;

9. The electronic oil pump according to claim 7, wherein the base portion includes a catching portion extending from a lower surface of the base portion toward the third housing, the winding of the winding includes a winding end portion provided integrally with the winding connecting portion, and a winding connecting portion in which the winding end portion is embedded;

the side wall of the base is formed with a first concave part which penetrates through the upper surface of the base and the lower surface of the base, and the first concave part forms a channel for placing the winding connection part;

or the base part is formed with a through hole, the through hole of the base part is provided with openings on the upper surface and the lower surface of the base part, and the through hole of the base part forms a channel for placing the winding connection part.

10. The electronic oil pump according to claim 8, wherein the base portion includes a catching portion extending from a lower surface of the base portion toward the third housing, the winding of the winding includes a winding end portion provided integrally with the winding connecting portion, and a winding connecting portion in which the winding end portion is embedded;

11. The electronic oil pump according to claim 9 or 10, characterized in that the electronic oil pump includes a radial positioning portion that includes a first flange portion and a first recessed portion into which the first flange portion protrudes;

a first flange portion is formed on the inner wall of the second housing, the first recess portion is provided as a first recess portion, and the first flange portion is inserted into the first recess portion;

or a side wall of the base portion is formed with a second recess portion provided as a first recess portion into which the first flange portion is inserted;

the second shell further comprises a first step part, the first step part comprises a first step surface and a second step surface, the first step surface is in contact with the upper surface of the base part, and part of the side wall of the base part is in clearance fit with the second step surface;

or the second shell further comprises a first step part, the first step part comprises a first step surface and a second step surface, the first step part is provided with a threaded hole, the threaded hole of the first step part is provided with an opening, the base part comprises a first hole, the upper surface and the lower surface of the base part are provided with openings, the first hole is opposite to the threaded hole of the first step part, and the base part and the first step part are fixed through screws.

12. The electronic oil pump according to claim 1, 2, 4, 5, 6, 7, 9, or 10, characterized in that the electronic oil pump includes an outlet, the first housing is formed with an inlet, a first communicating chamber, and a second communicating chamber, the inlet communicates with the first communicating chamber, and the outlet communicates with the second communicating chamber;

the upper surface of the first part supports the first rotor assembly, the first rotor assembly comprises a first rotor and a second rotor, the first rotor is sleeved on the second rotor, the second rotor can drive the first rotor to rotate, the second rotor is fixedly arranged with the second end of the pump shaft, the first rotor and the second rotor form a hydraulic cavity, and the hydraulic cavity can be communicated with the first communicating cavity and the second communicating cavity;

a first groove is formed in the upper surface of the first portion, the first groove comprises a first head portion, a first tail portion and two first side walls, the two first side walls are arranged oppositely, two ends of each first side wall are connected with the first head portion and the first tail portion, the distance between the two first side walls is increased from the first head portion to the first tail portion, and the projection of the first communication cavity on the upper surface of the first portion is overlapped with at least part of the first groove along the axial direction of the electronic oil pump;

and/or, the upper surface of first portion is formed with the second recess, the second recess includes second head, second afterbody and two second lateral walls, two the second lateral wall sets up relatively, the both ends of second lateral wall are connected the second head with the second afterbody, certainly the second head extremely the second afterbody, the distance increase between two second lateral walls, follow the axial direction of electronic oil pump, second intercommunication chamber is in the projection of the upper surface of first portion and at least part the coincidence of second recess.

13. The electronic oil pump according to claim 3, characterized in that the electronic oil pump includes an outlet, the first housing is formed with an inlet, a first communicating chamber, and a second communicating chamber, the inlet communicates with the first communicating chamber, and the outlet communicates with the second communicating chamber;

14. The electronic oil pump according to claim 8, characterized in that the electronic oil pump includes an outlet, the first housing is formed with an inlet, a first communicating chamber, and a second communicating chamber, the inlet communicates with the first communicating chamber, and the outlet communicates with the second communicating chamber;

15. The electronic oil pump according to claim 11, wherein the electronic oil pump includes an outlet, the first housing is formed with an inlet, a first communicating chamber, and a second communicating chamber, the inlet communicates with the first communicating chamber, and the outlet communicates with the second communicating chamber;

16. The electronic oil pump according to claim 12, further comprising a spacer, a seal, a terminal, and an electric control board, the spacer being located between the stator assembly and the electric control board in an axial direction of the electronic oil pump, the spacer being provided to the third housing, a side wall of the spacer being formed with a groove, the seal being provided to the groove of the spacer; binding post runs through the barrier member and with the barrier member is fixed to be set up, binding post's one end with stator module's joint portion joint is fixed, and with stator module's wire winding tip signal connection and/or electricity are connected, binding post's the other end with automatically controlled board relatively fixed and with automatically controlled board signal connection and/or electricity are connected.

17. The electronic oil pump according to claim 13, 14 or 15, characterized in that the electronic oil pump further comprises a spacer, a seal, a terminal, and an electric control board, the spacer is located between the stator assembly and the electric control board in an axial direction of the electronic oil pump, the spacer is provided to the third housing, a side wall of the spacer is formed with a groove, and the seal is provided to the groove of the spacer; binding post runs through the barrier member and with the barrier member is fixed to be set up, binding post's one end with stator module's joint portion joint is fixed, and with stator module's wire winding tip signal connection and/or electricity are connected, binding post's the other end with automatically controlled board relatively fixed and with automatically controlled board signal connection and/or electricity are connected.