CN115217753A

CN115217753A - Oil pump

Info

Publication number: CN115217753A
Application number: CN202110428766.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2022-10-21

Abstract

An oil pump includes a first rotor assembly and a pump housing, the oil pump having a first interior cavity, the first rotor assembly being located in the first interior cavity; the pump shell comprises a pump cover, and the pump cover covers at least part of the first rotor assembly; the pump cover comprises a first circulation division part and a first sub circulation part, the first circulation division part and the first sub circulation part extend from the top surface of the pump cover to the bottom surface of the pump cover, a cavity of the first circulation division part and a cavity of the first sub circulation part are both communicated with the first inner cavity, and a first opening of the first circulation division part and a first opening of the first sub circulation part are formed on the top surface of the pump cover; the first opening of the second flow passage is formed in the outer peripheral surface of the pump housing or the top surface of the pump cover; the first shunting part and the first sub-shunting part are used as two inlet channels of the oil pump, the second shunting part is used as one outlet channel of the oil pump, or the first shunting part and the first sub-shunting part are used as two outlet channels of the oil pump, and the second shunting part is used as one inlet channel of the oil pump; this is advantageous in simplifying the system structure.

Description

Oil pump

Technical Field

The application relates to the technical field of vehicles, in particular to an oil pump.

Background

The oil pump mainly provides a power source for a lubricating system and/or a cooling system of the vehicle; in some lubricating systems and/or cooling systems, two oil pumps are needed to meet the requirements of two groups of oil inlet and outlet channels of the system, so that the system structure is relatively complex; therefore, how to simplify the system structure while meeting the requirements of two sets of oil inlet and outlet circuits of the system is a technical problem to be considered.

Disclosure of Invention

An object of this application is to provide an oil pump, is favorable to simplifying system architecture.

In order to achieve the above purpose, one embodiment of the present application adopts the following technical solutions:

an oil pump comprising a first rotor assembly and a pump housing, the oil pump having a first internal cavity, the first rotor assembly being located in the first internal cavity; the pump housing includes a pump cover that covers at least a portion of the first rotor assembly; the pump cover comprises a first circulation dividing part and a first circulation sub-part, the first circulation dividing part and the first circulation sub-part extend from the top surface of the pump cover to the bottom surface of the pump cover, a cavity of the first circulation dividing part and a cavity of the first circulation sub-part are both communicated with the first inner cavity, and a first opening of the first circulation dividing part and a first opening of the first circulation sub-part are formed on the top surface of the pump cover; the oil pump further comprises a second circulation part, a cavity of the second circulation part is communicated with the first inner cavity, and a first opening of the second circulation part is formed in the outer peripheral surface of the pump shell or the top surface of the pump cover;

the first branch circulation part and the first sub circulation part are used as two inlet passages of the oil pump, and the second circulation part is used as one outlet passage of the oil pump, or the first branch circulation part and the first sub circulation part are used as two outlet passages of the oil pump, and the second circulation part is used as one inlet passage of the oil pump.

In the technical scheme disclosed by the application, the first shunting part and the first sub-shunting part are used as two inflow channels of the oil pump, and the second shunting part is used as one outflow channel of the oil pump, or the first shunting part and the first sub-shunting part are used as two outflow channels of the oil pump, and the second shunting part is used as one inflow channel of the oil pump; therefore, one oil pump can meet the requirements of two groups of oil inlet and outlet channels of the system, and the system structure is simplified.

Drawings

FIG. 1 is a perspective view of an oil pump of the present application;

FIG. 2 is a schematic cross-sectional view of the oil pump of FIG. 1;

FIG. 3 is a schematic diagram of the oil pump of FIG. 1 or FIG. 2 shown in an elevational view with the pump cover removed;

FIG. 4 is a front view of the oil pump of FIG. 1 or FIG. 2 with the pump cap, first rotor assembly and first housing removed;

FIG. 5 is a schematic perspective view of the first embodiment of the pump cap of FIG. 1 or FIG. 2 in one direction;

FIG. 6 is a schematic perspective view of the first embodiment of the pump cap of FIG. 1 or FIG. 2 in another orientation;

FIG. 7 is a schematic perspective view of a second embodiment of the pump cap of FIG. 1 or FIG. 2;

FIG. 8 is a perspective view of a third embodiment of the pump cap of FIG. 1 or FIG. 2;

FIG. 9 is a schematic perspective view of a fourth embodiment of the pump cap of FIG. 1 or FIG. 2;

FIG. 10 is a perspective view of a fifth embodiment of the pump cap of FIG. 1 or FIG. 2 in one direction;

FIG. 11 is a schematic perspective view of the sixth embodiment of the pump cap of FIG. 1 or FIG. 2 in another orientation;

fig. 12 is a schematic block diagram of a connection of the lubrication system of the present application.

Detailed Description

The present application is further described with reference to the following figures and specific examples:

the following detailed description of embodiments of the present application will be made with reference to the accompanying drawings. First, it should be noted that the directional terms such as upper, lower, left, right, front, rear, inner, outer, top, bottom and the like mentioned or possibly mentioned in the present specification are defined with respect to the configurations shown in the corresponding drawings, and they are relative concepts, and thus may be changed correspondingly according to the different positions and the different use states thereof. Therefore, these and other directional terms should not be construed as limiting terms.

The oil pump in the following embodiments is mainly capable of providing flowing power for a working medium of a vehicle lubrication system and/or a cooling system, and in particular is capable of providing flowing power for a working medium of a lubrication system and/or a cooling system in a vehicle transmission system.

Referring to fig. 1 and 2, the oil pump 100 includes a pump housing 1, a first rotor assembly 2, a stator assembly 4, a second rotor assembly 3, a motor rotor assembly 6, and a circuit board assembly 5, where the circuit board assembly 5 may have a function of supplying power to windings in the given rotor assembly 4, and may also have a function of controlling the operation of the first rotor assembly 2 and/or the second rotor assembly 3 in real time according to an operating environment; the oil pump 100 is provided with a first inner cavity 10, a second inner cavity 20 and a third inner cavity 30, the first rotor assembly 2 is arranged in the first inner cavity 10, the second rotor assembly 3 is arranged in the second inner cavity 20, and the stator assembly 4 and the motor rotor assembly 6 are arranged in the third inner cavity 30; the first rotor assembly 2, the second rotor assembly 3 and the motor rotor assembly 6 are distributed along the height direction of the oil pump 100, the second rotor assembly 3 is located between the first rotor assembly 2 and the motor rotor assembly 6, and the motor rotor assembly 6 is in transmission connection with the first rotor assembly 2 and the second rotor assembly 3, where "transmission connection" means that the motor rotor assembly 6 can directly or indirectly rotate the first rotor assembly 2 and the second rotor assembly 3, specifically, in the present embodiment, the oil pump 100 further includes a pump shaft 7, a part of the pump shaft 7 is connected with the motor rotor assembly 6, a part of the pump shaft 7 is connected with the first rotor assembly 2 and the second rotor assembly 3, and the motor rotor assembly 6 indirectly rotates the first rotor assembly 2 and the second rotor assembly 3 through the pump shaft 7; referring to fig. 1, the stator assembly 4 includes a stator core 41, an insulation frame 42 and a winding 43, the insulation frame 42 at least covers at least a part of the surface of the stator core 41, and the winding 43 is wound around the insulation frame 42; when the oil pump 100 works, the circuit board assembly 5 controls the stator assembly 4 to generate a changing excitation magnetic field by controlling the current in the winding 43 of the stator assembly 4 to change according to a preset rule, the motor rotor assembly 6 rotates under the action of the excitation magnetic field, and the motor rotor assembly 6 indirectly drives the first rotor assembly 2 and the second rotor assembly 3 to rotate through the pump shaft 7; when the first rotor assembly 2 rotates, the volume of a hydraulic cavity between the first rotor assembly 2 changes, so that the working medium is pressed out to the outflow port to generate flowing power; when the second rotor assembly 3 rotates, the volume of the hydraulic cavity between the second rotor assembly 3 changes, so that the working medium is pressed out to the other outflow port to generate flowing power; in the present embodiment, the working medium is cooling oil.

Referring to fig. 3, the first inner cavity 10 has a first region 101 and a second region 102, the pressure of the working medium in the second region 102 is greater than the pressure of the working medium in the first region 101, and in order to better distinguish the first region 101 from the second region 102, referring to fig. 3, the first region 101 and the second region 102 are respectively distinguished by two different section lines, in this embodiment, the first rotor assembly 2 rotates in a counterclockwise direction, where "counterclockwise" is viewed from a top view when the oil pump 100 without section is placed as shown in fig. 3; the first area 101 comprises at least two first volume cavities 1011, the second area 102 comprises at least two second volume cavities 1021, and the first volume cavities 1011 and the second volume cavities are also part of the first inner cavity 10 in fig. 2; in the first region 101, the volume of the first volume chamber 1011 gradually increases in the rotational direction of the first rotor assembly 2, and in the second region 102, the volume of the second volume chamber 1021 gradually decreases in the rotational direction of the first rotor assembly 2; referring to fig. 1 and 2, the oil pump 100 includes a first flow-dividing portion 40 and a second flow-dividing portion 50, a chamber of the first flow-dividing portion 40 communicates with a first volume chamber 1011, and a chamber of the second flow-dividing portion 50 communicates with a second volume chamber 1021; the first partial flow portion 40 is used for inflow of the working medium, and the second flow portion 50 is used for outflow of the working medium, and specifically, the working medium can enter the first volume chamber 1011 through the first partial flow portion 40, and the working medium can exit the second volume chamber 1021 through the second flow portion 50.

Specifically, referring to fig. 1 to 3, in the present embodiment, the first rotor assembly 2 includes a first inner rotor 21 and a first outer rotor 22, the first inner rotor 21 includes a plurality of outer teeth, the first outer rotor 22 includes a plurality of inner teeth, the first inner rotor 21 is fixedly connected to the pump shaft 7 in fig. 2, the first outer rotor 22 is sleeved on the outer periphery of the first inner rotor 21, and the central axis of the first inner rotor 21 and the central axis of the first outer rotor 22 are offset; in this embodiment, a certain eccentricity exists between the first inner rotor 21 and the first outer rotor 22, and when the first inner rotor 21 rotates, at least a part of external teeth of the first inner rotor 21 is engaged with at least a part of internal teeth of the first outer rotor 22, so that the first outer rotor 22 can be driven to rotate by the first inner rotor 21. Referring to fig. 3, in the first region 101, the first volume chamber 1011 is located between an outer tooth of the first inner rotor 21 and an inner tooth of the first outer rotor 22 corresponding to the outer tooth, and along the rotation direction of the first rotor assembly 2, the volume of the first volume chamber 1011 is gradually increased to form a partial vacuum, and at this time, the working medium is sucked into the first volume chamber 1011 from the first bypass portion 40; in the second region 102, the second volume chamber 1012 is located between one external tooth of the first inner rotor 21 and the internal tooth of the first outer rotor 22 corresponding to the external tooth, the volume of the second volume chamber 1012 is gradually reduced along the rotation direction of the first rotor assembly 2, and the working medium is compressed, so that the working medium entering the second volume chamber 1012 is pressed out to the second circulation portion 50 to generate flowing power; in the present embodiment, the first rotor assembly 2 is an internal gear, but the first rotor assembly 2 may be an external gear or a blade gear.

Referring to fig. 2 and 4, the second cavity 20 has a third area 201 and a fourth area 202, and in order to better distinguish the third area 201 from the fourth area 202, referring to fig. 4, the third area 201 and the fourth area 202 are respectively distinguished by two different cross-sectional lines, in this embodiment, the second rotor assembly 3 rotates in a counterclockwise direction, where "counterclockwise" is when the oil pump 100 without cross-section is placed as viewed from the top when viewed in the state of fig. 1; the third zone 201 comprises at least two third volumetric cavities 2011, the fourth zone 202 comprises at least two fourth volumetric cavities 2021, and the third volumetric cavities 2011 and the fourth volumetric cavities 2021 are also part of the second inner cavity 20 in fig. 2; in the third region 201, the volume of the third volume chamber 2011 gradually increases along the rotation direction of the second rotor assembly 3, and in the fourth region 202, the volume of the fourth volume chamber 2021 gradually decreases along the rotation direction of the second rotor assembly 3; the oil pump 100 further has a third flow portion 60 and a fourth flow portion 70, a chamber of the third flow portion 60 communicates with the third volume chamber 2011, and a chamber of the fourth flow portion 70 communicates with the fourth volume chamber 2021; the third flow passage 60 is used for inflow of the working medium, and the fourth flow passage 70 is used for outflow of the working medium, and specifically, the working medium can enter the third volume chamber 2011 through the third flow passage 60, and the working medium can exit the fourth volume chamber 2021 through the fourth flow passage 70.

Specifically, referring to fig. 4, in the present embodiment, the second rotor assembly 3 includes a second inner rotor 31 and a second outer rotor 32, the second inner rotor 31 includes a plurality of external teeth, the second outer rotor 32 includes a plurality of internal teeth, the second inner rotor 31 is fixedly connected to the pump shaft 7 in fig. 2, and the second outer rotor 32 is sleeved on the outer circumference of the second inner rotor 31; in this embodiment, a certain eccentricity exists between second inner rotor 31 and second outer rotor 32, and when second inner rotor 31 rotates, at least a part of external teeth of second inner rotor 31 meshes with at least a part of internal teeth of second outer rotor 32, so that second inner rotor 31 can drive second outer rotor 32 to rotate. Referring to fig. 4, in the third region 201, the third volume chamber 2011 is located between one external tooth of the second inner rotor 31 and the internal tooth of the second outer rotor 32 corresponding to the external tooth, along the rotation direction of the second rotor assembly 3, the volume of the third volume chamber 2011 is gradually increased to form a partial vacuum, and at this time, the working medium is sucked into the third volume chamber 2011 from the third flow-through portion 60; in the fourth area 202, the fourth volume chamber 2021 is located between one external tooth of the second inner rotor 31 and the internal tooth of the second outer rotor 32 corresponding to the external tooth, along the rotation direction of the second rotor assembly, the volume of the fourth volume chamber 2021 is gradually reduced, and the working medium is squeezed, so that the working medium entering the fourth volume chamber 2021 is squeezed out to the fourth circulating part 70 to generate flowing power; in the present embodiment, the second rotor assembly 3 is an internal gear, but the second rotor assembly 3 may be an external gear or a blade gear.

Referring to fig. 1, a pump housing 1 includes a pump cover 11, a first housing 12 and a second housing 13, the pump cover 11 is supported on the first housing 12 and fixedly connected to the first housing 12, the pump cover 11 at least partially covers the first rotor assembly 2, a top surface of the pump cover 11 forms at least a portion of a top surface 101 of the pump housing 1, the first housing 12 is located between the pump cover 11 and the second housing 13, and as another embodiment, the first housing 12 may also be partially located between the pump cover 11 and the second housing 13; referring to fig. 2, in the present embodiment, the first inner cavity 20 is formed in the first housing 12, but as another embodiment, the first inner cavity 20 may be formed in part in the first housing 12 and in part in the pump cap 11, or the first inner cavity 20 may be formed in its entirety in the pump cap 11, or other components may be disposed between the first housing 12 and the pump cap 11, and the first inner cavity 20 may have parts formed in its entirety or in part in the space between the first housing 12 and the pump cap 11.

Referring to fig. 1, 5, and 6, first flow dividing portion 40 is formed in pump cover 11, first flow dividing portion 40 extends from top surface 111 of pump cover 11 in a direction toward bottom surface 112 of pump cover 11 along the height direction of pump cover 11, and first opening 401 of first flow dividing portion 40 is formed in top surface 111 of pump cover 11; the cavity of the first branched flow portion 40 communicates with the first inner cavity 10 in fig. 2. The pump cover 11 further has a first sub flow-through 80, the first sub flow-through 80 extends from the top surface 111 of the pump cover 11 toward the bottom surface 112 of the pump cover 11, the cavity of the first sub flow-through 80 communicates with the first inner cavity 10 in fig. 2, and the first opening 801 of the first sub flow-through 80 is formed in the top surface 111 of the pump cover 11; in the present embodiment, the second circulation portion 50 is formed on the outer peripheral surface of the pump housing, specifically, the first opening 501 of the second circulation portion 50 is partially formed on the outer peripheral surface of the first housing 12, and the first opening 501 of the second circulation portion 50 is partially formed on the outer peripheral surface of the pump cover 11; of course, as another embodiment, the first opening 501 of the second flow passage 50 may be formed only in the outer peripheral surface of the pump cover 11, and as another embodiment, the first opening 501 of the second flow passage 50 may be formed in the top surface 111 of the pump cover 11; in this embodiment, the first branch circulation portion 40 and the second circulation portion 50 are used as a set of inlet and outlet passages, wherein the first branch circulation portion 40 is an inlet passage, and the second circulation portion 50 is an outlet passage; the first sub-circulation part 80 and the second circulation part 50 are used as another set of access passages, wherein the first sub-circulation part 80 is an inlet passage of the set of access passages, and the second circulation part 50 is an outlet passage of the set of access passages; of course, as another embodiment, the first branch flow part 40 and the second flow part 50 may be a set of inlet and outlet passages, wherein the first branch flow part 40 is an outlet passage and the second flow part 50 is an inlet passage; correspondingly, the first sub-circulation portion 80 and the second circulation portion 50 serve as another set of inlet and outlet channels, wherein the first sub-circulation portion is an outlet channel of the set of inlet and outlet channels, and the second circulation portion 50 is an inlet channel of the set of inlet and outlet channels; therefore, one oil pump can meet the requirements of two groups of oil inlet and outlet ways of the system, and the system structure is simplified.

Referring to fig. 5, in the present embodiment, the first circulation dividing portion 40 and the first circulation sub-portion 80 are both disposed obliquely, specifically, the distance between the first circulation dividing portion 40 and the first circulation sub-portion 80 gradually decreases from the top surface 111 of the pump cover 11 to the bottom surface 112 of the pump cover 11; of course, as another embodiment, referring to fig. 7, the first sub-circulation part 40 is vertical and the first sub-circulation part 80 is inclined, but as another embodiment, the first sub-circulation part 40 may be inclined and the first sub-circulation part 80 may be vertical; therefore, the first branch circulation part 40 and the first sub circulation part 80 can be communicated with the area corresponding to the first inner cavity 10 in fig. 3 in an inclined arrangement mode, so that only one first inner rotor and one first outer rotor are needed on the design requirement of the first rotor assembly, and the structure is simpler.

Referring to fig. 5, the first opening 401 of the first sub circulation part 40 and the first opening 801 of the first sub circulation part 80 are spaced a predetermined distance; the first bypass portion 40 and the first bypass portion 80 intersect. Specifically, referring to fig. 5, the pump cover 11 has a communication port 110, the communication port 110 communicates with the first internal chamber 10 in fig. 2, and the communication port 110 is closer to the bottom surface of the pump cover 11 than the first opening 401 of the first branch flow portion 40 in the height direction of the pump cover 11; the communication port 110 serves as a second opening of the first sub-communication unit 40 on the pump cover and a second opening of the first sub-communication unit 80 on the pump cover; in the present embodiment, the central axis of the communication port 110 is offset from the central axis of the first inner rotor 21 in fig. 3; this enables the communication port 110 to be relatively more biased toward the volume chamber between the first rotor assembly 2 in fig. 3, which is advantageous in improving the reliability of the communication port 110 with the volume chamber between the first rotor assembly 2.

Referring to fig. 5, in the present embodiment, communication port 110 is formed in bottom surface 112 of pump cover 11; the first opening 401 of the first branch flow part 40 and the first opening of the first sub flow part 80 are projected toward the communication port 110, the projected portion of the first opening 401 of the first branch flow part 40 is located at the communication port 110, and the projected portion of the first opening of the first sub flow part 80 is located at the communication port 110, and in the present embodiment, the communication port 110 is circular; of course, as another embodiment, the communication port 110 may have an elliptical shape or another shape.

As another embodiment, referring to fig. 8, in the present embodiment, the communication port 110 is formed in the bottom surface 112 of the pump cover 11; the circumferential surface corresponding to the communication port 110 comprises a first cambered surface 1101 and a second cambered surface 1102, and the first cambered surface 1101 is connected with the second cambered surface 1102; the first opening 401 of the first branch flow portion 40 is projected toward the communication port 110, the projection of the first opening 401 of the first branch flow portion 40 is at least partially located in the cavity corresponding to the first arc 1101, and the projection of the first opening 801 of the first sub flow portion 80 is at least partially located in the cavity corresponding to the second arc 1102.

As another example, referring to fig. 9, the pump cover 11 further includes a hole portion 113, the hole portion 113 extending from the bottom surface 112 of the pump cover 11 toward the top surface 111 of the pump cover 11 in the height direction of the pump cover 11, a cavity of the hole portion 113 communicating with a cavity of the first sub-circulation portion 40, and a cavity of the hole portion 113 communicating with a cavity of the first sub-circulation portion 80; aperture 1131 of hole 113 is formed in bottom surface 112 of pump cover 11, and aperture 1131 of hole 113 constitutes a communication port.

In the above embodiments, referring to fig. 5 to 9, the pump cover 11 is used as an object, the second flow passage 50 is not spatially communicated with the first branch flow passage 40, and the second flow passage 50 is not spatially communicated with the first sub flow passage 80. Of course, as another embodiment, referring to fig. 10 and 11, the second circulation part 50 may be spatially communicated with the first circulation part 40, and the second circulation part 50 may be spatially communicated with the first circulation part 80; specifically, referring to fig. 10 and 11, pump cap 11 includes a first recess 502, the first recess 502 being recessed from the bottom surface 112 of pump cap 11 along the height direction of pump cap 11, the first recess 502 having a first gap 5021, the first gap 5021 being formed on the outer circumferential surface of pump cap 11, the first gap 5021 constituting at least part of the first opening 501 of the second flow-through portion 50; the communication port 110 is formed in the bottom surface of the first recess 502.

Referring to fig. 1 and 12, the present application further discloses a lubrication system 106, which includes an oil accumulation portion 1061, an oil pump 100, an oil tank 1062, and a portion to be lubricated 1063, wherein the oil pump 100 is the oil pump 100 described in the above embodiments, a first branch portion 40 and a second branch portion 50 of the oil pump 100 are used as a first set of inlet and outlet passages of the oil pump 100, the first branch portion 40 is used as one inlet passage of the first set of inlet and outlet passages, and the second branch portion 50 is used as one outlet passage of the first set of inlet and outlet passages; the third circulation part 60 of the oil pump 100 and the fourth circulation part 70 of the oil pump 100 are used as a second set of inlet and outlet passages of the oil pump 100, wherein the third circulation part of the oil pump 100 is used as one inlet passage of the second set of inlet and outlet passages, and the fourth circulation part of the oil pump 100 is used as one outlet passage of the second set of inlet and outlet passages; the first branch flow part 40 of the oil pump 100 communicates with a chamber corresponding to the oil accumulation part 1061, and the second flow part 50 communicates with an inlet of the oil tank 1062; the third flow portion 60 communicates with an outlet of the oil tank 1062, and the fourth flow portion 70 communicates with a chamber in which the portion to be lubricated 1063 is located; the oil pump 100 further includes a first sub-circulation portion 80, the first sub-circulation portion 80 communicates with a cavity corresponding to the oil accumulation portion 1061, the first sub-circulation portion 80 serves as another inflow channel of the oil pump, and an outflow channel corresponding to the first sub-circulation portion 80 serves as the second sub-circulation portion 50.

It should be noted that: although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can make modifications and substitutions on the present application, and all technical solutions and modifications which do not depart from the spirit and scope of the present application should be covered by the claims of the present application.

Claims

1. An oil pump, characterized in that: the oil pump comprises a first rotor assembly and a pump shell, wherein the oil pump is provided with a first inner cavity, and the first rotor assembly is positioned in the first inner cavity; the pump housing includes a pump cover that covers at least a portion of the first rotor assembly; the pump cover comprises a first circulation dividing part and a first sub circulation part, the first circulation dividing part and the first sub circulation part extend from the top surface of the pump cover to the bottom surface of the pump cover, a cavity of the first circulation dividing part and a cavity of the first sub circulation part are both communicated with the first inner cavity, and a first opening of the first circulation dividing part and a first opening of the first sub circulation part are formed on the top surface of the pump cover; the oil pump further comprises a second circulation part, a cavity of the second circulation part is communicated with the first inner cavity, and a first opening of the second circulation part is formed in the outer peripheral surface of the pump shell or the top surface of the pump cover;

the first flow dividing part and the first sub-flow part are used as two inlet channels of the oil pump, and the second flow part is used as one outlet channel of the oil pump, or the first flow dividing part and the first sub-flow part are used as two outlet channels of the oil pump, and the second flow part is used as one inlet channel of the oil pump.

2. The oil pump of claim 1, wherein: at least one of the first bypass part and the first bypass part is obliquely arranged; the distance between the first sub circulation part and the first sub circulation part is gradually reduced from the top surface of the pump cover to the bottom surface of the pump cover.

3. The oil pump according to claim 1 or 2, characterized in that: the first opening of the first sub circulation part and the first opening of the first sub circulation part are separated by a preset distance; the first bypass portion and the first bypass portion intersect.

4. The oil pump of claim 3, wherein: the pump cover is provided with a communication port, the communication port is communicated with the first inner cavity, and the communication port is closer to the bottom surface of the pump cover than the first opening of the first branch circulation part along the height direction of the pump cover; the communication port is commonly used as a second opening of the first sub-circulation part on the pump cover and a second opening of the first sub-circulation part on the pump cover.

5. The oil pump of claim 4, wherein: the communication port is formed on the bottom surface of the pump cover; projecting the first opening of the first sub-flow portion and the first opening of the first sub-flow portion toward the communication port, wherein a projected portion of the first opening of the first sub-flow portion is located at the communication port, and a projected portion of the first opening of the first sub-flow portion is located at the communication port.

6. The oil pump of claim 5, wherein: the circumferential surface corresponding to the communication port comprises a first cambered surface and a second cambered surface, and the first cambered surface is connected with the second cambered surface; and projecting the first opening of the first branch circulation part towards the communication port, wherein the projection of the first opening of the first branch circulation part is at least partially positioned in the cavity corresponding to the first cambered surface, and the projection of the first opening of the first branch circulation part is at least partially positioned in the cavity corresponding to the second cambered surface.

7. The oil pump of claim 4, wherein: the pump cover further comprises a hole part, the hole part extends from the bottom surface of the pump cover to the top surface of the pump cover along the height direction of the pump cover, and the cavity of the hole part is communicated with the cavity of the first circulation division part; the cavity of the hole part is communicated with the cavity of the first sub-circulation part; the orifice of the hole portion is formed in the bottom surface of the pump cover, and the orifice of the hole portion constitutes the communication port.

8. The oil pump of claim 4, wherein: the pump cover comprises a first concave part, the first concave part is arranged in a recessed mode from the bottom surface of the pump cover along the height direction of the pump cover, the first concave part is provided with a first notch, the first notch is formed in the outer peripheral surface of the pump cover, and the first notch forms at least part of a first opening of the second circulation part; the communication port is formed in a bottom surface of the first recess.

9. The oil pump according to any one of claims 4 to 8, characterized in that: the first rotor assembly comprises a first inner rotor and a first outer rotor, the first outer rotor is sleeved on the periphery of the first inner rotor, the first inner rotor is provided with a plurality of outer teeth, and the first outer rotor is provided with a plurality of inner teeth; the central axis of the first inner rotor is arranged in an offset way with the central axis of the first outer rotor; the central axis of the communication port is offset from the central axis of the first inner rotor.