CN109113958B

CN109113958B - Electric oil pump assembly, steering system and lubricating system

Info

Publication number: CN109113958B
Application number: CN201710496469.2A
Authority: CN
Inventors: 杨胜麟; 刘彦; 吴斌仁; 陈涛
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2017-06-26
Filing date: 2017-06-26
Publication date: 2020-10-23
Anticipated expiration: 2037-06-26
Also published as: CN109113958A

Abstract

The invention discloses an electric oil pump assembly, a steering system and a lubricating system, wherein the electric oil pump assembly is provided with a main oil inlet and a main oil outlet and comprises: the motor assembly is provided with a liquid cooling cavity communicated with the main oil inlet, the liquid cooling cavity comprises a circulating oil duct, and the circulating oil duct is positioned between a stator of the motor assembly and a motor shell of the motor assembly; the oil pump assembly is fixedly connected with the end part of the motor assembly and is in power coupling connection with a motor shaft of the motor assembly, an oil suction port of the oil pump assembly is communicated with the circulating oil duct, and an oil discharge port is communicated with the total oil outlet. The electric oil pump assembly provided by the embodiment of the invention realizes oil absorption of the oil pump component by a fixed connection mode and by arranging the liquid cooling cavity, the oil pump component is firmly assembled, the output pulse of the oil pump component can be reduced, the heat dissipation performance and the working stability of the electric oil pump assembly are improved, the integration level is high, and the light weight level is high.

Description

Electric oil pump assembly, steering system and lubricating system

Technical Field

The invention belongs to the technical field of vehicle manufacturing, and particularly relates to an electric oil pump assembly, a steering system with the electric oil pump assembly and a lubricating system with the electric oil pump assembly.

Background

The electric oil pump is widely applied to a steering system and a lubricating system of a vehicle, in the related technology, the oil pump and the motor of the electric oil pump are split, and the connection relation is only the power coupling connection of the oil pump shaft and the motor shaft, so that the electric oil pump is large in size and large in occupied installation space. In addition, the working noise of the motor and the working noise of the oil pump are large, noise is usually isolated by arranging various damping elements in the related art, the damping elements are complex in structure, large installation space is occupied, production cost is high, assembly process is complex, and improvement space exists.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the electric oil pump assembly which is firm in assembly and good in heat dissipation performance and working stability.

According to the electric oil pump assembly of the embodiment of the present invention, the electric oil pump assembly has a main oil inlet and a main oil outlet, and includes: the motor assembly is provided with a liquid cooling cavity communicated with the main oil inlet, the liquid cooling cavity comprises a circulating oil duct, and the circulating oil duct is positioned between a stator of the motor assembly and a motor shell of the motor assembly; the oil pump assembly is fixedly connected with the end part of the motor assembly and is in power coupling connection with a motor shaft of the motor assembly, an oil suction port of the oil pump assembly is communicated with the circulating oil duct, and an oil discharge port is communicated with the total oil outlet.

According to the electric oil pump assembly provided by the embodiment of the invention, the oil absorption of the oil pump component is realized by the fixed connection mode and the arrangement of the liquid cooling cavity, the oil pump component is firmly assembled, the output pulse of the oil pump component can be reduced, the heat dissipation performance and the working stability of the electric oil pump assembly are improved, the integration level is high, and the light weight level is high.

According to the electric oil pump assembly provided by the embodiment of the invention, the oil pump component is fixedly connected with the front end cover of the motor component through the threaded connecting piece.

According to the electric oil pump assembly, the edge of the front cover plate of the oil pump assembly is provided with the lug which protrudes outwards in the radial direction, and the threaded connecting piece penetrates through the lug and is in threaded connection with the front end cover.

According to the electric oil pump assembly of one embodiment of the invention, the threaded connection member is a plurality of which are arranged at intervals in the circumferential direction.

According to the electric oil pump assembly provided by the embodiment of the invention, the oil pump component is fixedly connected with the front end cover of the motor component, and the oil pump component and the front end cover are positioned through the positioning structure.

According to the electric oil pump assembly provided by the embodiment of the invention, the positioning structure is a positioning pin, and two ends of the positioning pin respectively extend into the positioning grooves on the front cover plate and the front end cover of the oil pump assembly.

According to the electric oil pump assembly of one embodiment of the invention, the positioning structure is a positioning boss protruding from the front end cover or from a front cover plate of the oil pump assembly.

An electric oil pump assembly according to an embodiment of the present invention has: the oil pump comprises an oil pump cavity, wherein the oil pump component is fixedly connected with the front end cover of the motor component, the oil pump component is installed in the oil pump cavity, and oil is filled in the oil pump cavity.

According to the electric oil pump assembly of one embodiment of the invention, the oil pump cavity is communicated with the main oil inlet, and the oil suction port is connected with the oil pump cavity.

According to the electric oil pump assembly of one embodiment of the invention, one end of the channel is connected with the oil discharge port of the oil pump assembly, and the other end of the channel forms the main oil outlet.

According to the electric oil pump assembly of one embodiment of the invention, the oil pump chamber is connected with the oil discharge port of the oil pump assembly and communicated with the main oil outlet.

According to the electric oil pump assembly provided by the embodiment of the invention, the front end cover is provided with the oil outlet channel, one end of the oil outlet channel is connected with the oil pump cavity, and the other end of the oil outlet channel forms the total oil outlet.

According to the electric oil pump assembly, the front end cover is provided with an annular boss extending in the direction away from the motor component along the axial direction, the annular boss forms a side wall of the oil pump cavity, and the top wall of the oil pump cavity is connected with the annular boss through a threaded fastener.

The electric oil pump assembly according to an embodiment of the present invention further includes: and the sound-proof cover is covered outside the outer wall surface of the oil pump cavity.

The electric oil pump assembly according to an embodiment of the present invention further includes: and the low-pressure cover covers the wall surface of the oil pump cavity and limits a low-pressure cavity communicated with the main oil inlet, and the low-pressure cover is connected with the front end cover.

According to the electric oil pump assembly of one embodiment of the present invention, the low-pressure cover has a tapered peripheral wall, and an inner diameter of the low-pressure cover is tapered from a direction close to the main oil inlet to a direction away from the main oil inlet.

According to the electric oil pump assembly, the sealing ring is clamped between the oil pump assembly and the front end cover.

According to the electric oil pump assembly of one embodiment of the invention, the motor assembly and the oil pump assembly are transversely arranged.

According to an electric oil pump assembly of an embodiment of the present invention, the motor assembly further includes: the oil pump assembly is supported on the front end cover in a floating mode, the rear end cover seals the rear end of the motor shell to form a rear cavity of the liquid cooling cavity, the circulating oil ducts are multiple and are arranged at intervals along the circumferential direction, and the circulating oil ducts are communicated with the rear cavity.

According to the electric oil pump assembly of one embodiment of the present invention, the oil in at least one of the plurality of circulation oil passages flows from back to front and is connected to the oil suction port.

According to the electric oil pump assembly, oil in one part of the circulation oil passages flows from back to front, oil in the other part of the circulation oil passages flows from front to back, and two kinds of circulation oil passages with different oil flowing directions are arranged in a staggered mode in the circumferential direction.

According to the electric oil pump assembly of one embodiment of the present invention, one of the plurality of circulation oil passages is connected to the main oil inlet so that oil flows into the liquid cooling chamber through the one of the plurality of circulation oil passages.

According to the electric oil pump assembly provided by the embodiment of the invention, an oil baffle ring is arranged between the stator and the front end cover.

According to the electric oil pump assembly of one embodiment of the present invention, the circulation oil passage extends in the axial direction.

According to the electric oil pump assembly of one embodiment of the invention, the oil pump assembly is supported on the front end cover of the motor assembly in a floating mode, and the front end cover is provided with the oil passage for communicating the circulating oil passage and the oil suction opening.

According to the electric oil pump assembly of one embodiment of the invention, the front end cover is provided with a support flange which protrudes towards the rotor of the motor component along the axial direction, the support flange is used for supporting a bearing of the motor component, the support flange, the motor shaft and the bearing of the motor component jointly define an oil suction cavity connected with the oil suction opening, and the oil passage penetrates through the support flange to communicate the oil suction cavity with the circulating oil passage.

According to the electric oil pump assembly of one embodiment of the invention, the main oil inlet is arranged on the front end cover of the motor component and is communicated with the circulating oil passage.

According to the electric oil pump assembly, the main oil inlet is arranged above the front end cover.

The invention also provides a steering system which is provided with the electric oil pump assembly.

The steering system and the electric oil pump assembly have the same advantages compared with the prior art, and the detailed description is omitted.

The invention also provides a lubricating system which is provided with the electric oil pump assembly.

The lubricating system and the electric oil pump assembly have the same advantages compared with the prior art, and the details are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

1-38 are schematic structural views of an electric oil pump assembly according to some embodiments of the present invention;

FIG. 39 is a cross-sectional schematic view of the motor assembly in the embodiment shown in FIGS. 1, 3, 4, 5, 8, 9, 10, 12, 13, 14, 17, 18, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 36, 37;

FIG. 40 is a cross-sectional schematic view of the motor assembly in the embodiment shown in FIGS. 2, 6, 7, 11, 15, 16, 20, 23, 25, 28, 30, 33, 35, 38;

FIG. 41 is an assembled schematic view of the oil pump assembly of the embodiment shown in FIGS. 10, 11, 12, 24, 25, 34, 35;

FIG. 42 is a schematic structural view of a coupling according to an embodiment of the present invention;

fig. 43 is a schematic configuration diagram of a steering system according to an embodiment of the invention;

fig. 44 is a schematic configuration diagram of a lubrication system according to an embodiment of the present invention.

Reference numerals:

the steering system 1, the lubrication system 2,

the electric oil pump assembly 1000, a main oil inlet 1010, a main oil outlet 1020, an oil pump cavity 1030, a top wall 1031 of an oil pump cavity and a low pressure cavity 1040;

the oil pump assembly 100, the front cover plate 110, the clamping groove 111, the lug 112, the rear cover plate 120 and the oil pump shaft 130;

the motor assembly 200, the front end cover 210, the support flange 211, the oil outlet channel 212, the annular boss 213, the oil passing channel 214, the oil inlet channel 215, the motor shell 220, the rear end cover 230, the support seat 231, the stator 241, the rotor 242, the motor shaft 250, the motor shaft oil channel 251, the oil supply hole 252, the liquid cooling cavity 260, the rear cavity 261, the circulating oil channel 262, the oil suction cavity 263 and the oil blocking ring 271;

the elastic element 311, the positioning element 312, the magnetic element 321, the positioning unit 322, the buckle 331, the hook 332, the guide surface 333 and the threaded connector 341;

coupler 410, coupling hole 411, sound-proof housing 510, low-pressure housing 520.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

An electric oil pump assembly 1000 according to an embodiment of the present invention will be described first with reference to fig. 1 to 42.

Example one

As shown in fig. 1, 4, 5, 10, 13, 14, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 36, 37, 39, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: a motor assembly 200 and an oil pump assembly 100.

The oil pump assembly 100 is coupled to the motor shaft 250, and the motor assembly 200 is used to provide a driving force for operating the oil pump assembly 100, for example, the motor shaft 250 of the motor assembly 200 may be connected to the oil pump shaft 130 of the oil pump assembly 100 through the coupling 410, and of course, the motor assembly 200 is not limited to directly driving the oil pump assembly 100, and may also be connected to the oil pump assembly 100 through a transmission mechanism such as a gearbox or a reducer.

The oil pump assembly 100 is driven by the motor assembly 200 to operate so as to convert low-pressure oil into high-pressure oil for output, the oil pump assembly 100 may have various structural forms, for example, the oil pump assembly 100 may be an external gear pump, a gerotor gear pump, a vane pump or a plunger pump, and the motor assembly 200 may be a synchronous motor, an asynchronous motor, or various types of motors.

The oil pump assembly 100 is mounted at an end of the motor assembly 200, for example, the oil pump assembly 100 may be mounted on the front end cover 210 of the motor assembly 200, the oil pump assembly 100 may be directly mounted on the front end cover 210, or the oil pump assembly 100 may be indirectly mounted on the front end cover 210 through other mounting structures (such as a support plate), specifically, the front cover plate 110 of the oil pump assembly 100 may be supported on the front end cover 210 of the motor assembly 200, where the front cover plate 110 is a cover plate of a power input end of the oil pump assembly 100, that is, the oil pump shaft 130 extends from the front cover plate 110, and correspondingly, the rear cover plate 120 is a cover plate of the other end of the oil pump assembly 100.

The electric oil pump assembly 1000 has a main oil inlet 1010 and a main oil outlet 1020, and oil enters the electric oil pump assembly 1000 from the main oil inlet 1010 and flows out from the main oil outlet 1020. The oil pump assembly 100 has an oil suction port and an oil discharge port, and low-pressure (normal pressure) oil is sucked into the cavity of the oil pump assembly 100 from the oil suction port and is converted into high-pressure oil to be discharged from the oil discharge port.

A motor shaft oil passage 251 is arranged in the motor shaft 250 of the motor assembly 200, the motor shaft oil passage 251 can extend along the axial direction of the motor shaft 250, the motor shaft oil passage 251 is communicated with the main oil inlet 1010, the oil suction port of the oil pump assembly 100 is communicated with the motor shaft oil passage 251, and the oil discharge port of the oil pump assembly 100 is communicated with the main oil outlet 1020.

That is, the flow path of the oil is: the main oil inlet 1010, the motor shaft oil channel 251, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100 and the main oil outlet 1020 can convert low-pressure oil into high-pressure oil, the circularly flowing oil can take away the heat of the motor assembly 200 through the motor shaft 250, the stable work of the motor assembly 200 is ensured, the motor assembly 200 does not need to be provided with a heat dissipation unit independently, and the size and the weight of the electric oil pump assembly 1000 can be reduced.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the oil absorption of the oil pump assembly 100 is realized by arranging the motor shaft oil passage 251, so that the heat dissipation performance and the working stability of the electric oil pump assembly 1000 are improved, the integration level is high, and the light weight level is high.

According to the electric oil pump assembly 1000 in accordance with a preferred embodiment of the present invention, as shown in fig. 1, 4, 5, 10, 13, 14, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 36, 37, 39, the motor assembly 200 may include: front end cap 210, motor casing 220, rear end cap 230, stator 241 and rotor 242.

The front end cover 210 is installed at the front end of the motor casing 220, for example, the front end cover 210 may be connected to the front end of the motor casing 220 by a threaded fastener, and the rear end cover 230 closes the rear end of the motor casing 220, for example, the rear end cover 230 may be connected to the rear end of the motor casing 220 by a threaded fastener, where the front end represents an output end (a right end in fig. 1 to 38) of the motor assembly 200, and the rear end represents an end (a left end in fig. 1 to 38) axially far away from the output end.

Motor assembly 200 may have a liquid cooling chamber 260, liquid cooling chamber 260 may be in communication with a main oil inlet 1010, and motor shaft oil passage 251 is in communication with main oil inlet 1010 through liquid cooling chamber 260.

It is understood that the liquid cooling chamber 260 may be a free space within the chamber of the motor assembly 200, and the oil flow path is: the main oil inlet 1010, the liquid cooling cavity 260, the motor shaft oil channel 251, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100 and the main oil outlet 1020.

The cabin of the motor assembly 200 is filled with flowing oil, the parts inside the motor assembly 200 are soaked in the oil, for example, the stator 241 and the rotor 242 can be in full contact with the oil, the heat capacity of the oil is large, local high temperature generated by the stator 241 and the rotor 242 due to load fluctuation can be avoided, the flowing oil simultaneously provides heat dissipation and lubrication for a moving part, the working stability of the motor assembly 200 is ensured, and the working noise can be reduced.

The rotor 242 of the motor assembly 200 can be immersed in oil (low pressure oil), so that the oil can play a role in delaying the rotation of the rotor 242 to buffer the problems of rapid acceleration or rapid deceleration of the rotor 242 and overlarge inertia modulus, and when the electric oil pump assembly 1000 is used for the steering system 1, the impact on a steering oil path when the motor assembly 200 is unloaded can be prevented, the steering hand feeling is better, and the steering wheel is not easy to shake.

The liquid-cooling chamber 260 includes a circulation oil passage 262 and a rear chamber 261.

As shown in fig. 39, the number of the circulating oil ducts 262 may be multiple, for example, four in fig. 39, and the multiple circulating oil ducts 262 may be arranged at intervals along the circumferential direction of the stator 241, so that heat dissipation at each circumferential position of the motor component 200 is uniform, the circulating oil ducts 262 may be communicated with a main oil inlet 1010, for example, the main oil inlet 1010 may be disposed at the upper portion of the electric oil pump assembly 1000, so as to facilitate gas discharge when oil flows in, and the main oil inlet 1010 may be connected to the uppermost circulating oil duct 262.

The rear cavity 261 is located between the rear end cover 230 and the stator 241, the motor shaft 250, and the rotor 242, and the rear cavity 261 communicates with the circulation oil passages 262, and particularly, a rear end of each circulation oil passage 262 may be connected to the rear cavity 261.

The motor shaft oil passage 251 extends in the axial direction, and the motor shaft oil passage 251 is open at an end away from the oil pump assembly 100, and the motor shaft oil passage 251 is communicated with the liquid cooling chamber 260 at the end, specifically, the motor shaft oil passage 251 is connected with the rear cavity 261 at the end, the rear end cover 230 may have a supporting seat 231, the supporting seat 231 is used for supporting the rear end of the motor shaft 250 (through a bearing), as shown in fig. 1, 4, 5, 10, 13, 14, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 36 and 37, an oil passage may be provided on the supporting seat 231 to communicate the rear cavity 261 with the motor shaft oil passage 251, so that the relatively closed space formed by the supporting seat 231 and the bearing can prevent the oil turbulence of the oil in the liquid cooling chamber 260 caused by the oil suction of the motor shaft oil passage 251.

The other end of the motor shaft oil passage 251 (the end close to the oil pump assembly 100) is provided with an oil supply hole 252 extending in the radial direction, and the oil supply hole 252 may communicate with the oil suction port. The oil supply holes 252 may be a plurality of, for example, four, and the plurality of oil supply holes 252 are uniformly spaced in the circumferential direction, so that the acting force of the oil flow on the motor shaft 250 is balanced in each radial direction, and thus the oil flow in the oil passage 251 of the motor shaft has no influence on the rotation of the motor shaft 250.

As shown in fig. 1, 4, 5, 10, 13, 14, 19, 21, 22, 24, 26, 27, 29, 31, 32, 34, 36, and 37, the front cover 210 may have a support flange 211 protruding toward the rotor 242 of the motor assembly 200 in the axial direction, the support flange 211 may have a circular ring shape, the support flange 211 is used to support a bearing of the motor assembly 200, the support flange 211, the motor shaft 250, and the bearing of the motor assembly 200 together define an oil suction chamber 263, the oil suction chamber 263 is connected to the oil suction port, and the oil supply hole 252 is connected to the oil suction chamber 263. The oil suction chamber 263 serves as a buffer space for the oil suction of the oil pump assembly 100, and facilitates the oil to be discharged from the oil supply hole 252 having a relatively small diameter.

Further, an oil baffle 271 may be disposed between the stator 241 and the front end cover 210, and the oil baffle 271 may be made of an oil-resistant material, such as a linoleum, as shown in fig. 1, fig. 4, fig. 5, fig. 10, fig. 13, fig. 14, fig. 19, fig. 21, fig. 22, fig. 24, fig. 26, fig. 27, fig. 29, fig. 31, fig. 32, fig. 34, fig. 36, and fig. 37, the oil baffle 271 may be annular, the oil baffle 271 may be sleeved outside the support flange 211, a portion of the stator 241 close to the front end cover 210 may be sleeved outside the oil baffle 271, and the oil baffle 271 may prevent the oil pump assembly 100 from directly sucking oil from a nearby cavity, so that oil flows well in all places in the motor assembly 200, thereby dissipating heat in a balanced manner.

Of course, there may be a gap between the stator 241 and the oil deflector 271, and a gap between the oil deflector 271 and the rotor 242, but the gap does not affect the overall flow direction of the oil. Thus, the general flow path of the oil can be ensured as follows: a main oil inlet 1010, a circulating oil passage 262, a rear cavity 261, a motor shaft oil passage 251, an oil supply hole 252, an oil suction cavity 263, an oil suction port of the oil pump assembly 100, an oil discharge port of the oil pump assembly 100 and a main oil outlet 1020.

Example two

As shown in fig. 2, 6, 7, 11, 15, 16, 20, 23, 25, 28, 30, 33, 35, 38, and 40, the electric oil pump assembly 1000 according to an embodiment of the present invention includes: a motor assembly 200 and an oil pump assembly 100.

The motor assembly 200 has the liquid cooling chamber 260, and the liquid cooling chamber 260 can communicate with total oil inlet 1010, and fluid passes through the liquid cooling chamber 260 and inhales oil pump assembly 100, and the liquid cooling chamber 260 can be the vacant space in the cabin of motor assembly 200, and fluid flows into the liquid cooling chamber 260 through total oil inlet 1010, and fluid is filled in the liquid cooling chamber 260, is equivalent to that the inside spare part of motor assembly 200 (for example stator 241, rotor 242 etc.) soaks in fluid.

The liquid cooling chamber 260 is filled with flowing oil, the internal parts of the motor assembly 200 are soaked in the oil, for example, the stator 241 and the rotor 242 can be in full contact with the oil, the heat capacity of the oil is large, local high temperature generated by the stator 241 and the rotor 242 due to load fluctuation can be avoided, the flowing oil provides heat dissipation and lubrication for a moving part, the working stability of the motor assembly 200 is ensured, and the working noise can be reduced.

The liquid cooling chamber 260 includes a circulation oil passage 262, the circulation oil passage 262 is located between the stator 241 of the motor assembly 200 and the motor casing 220 of the motor assembly 200, it is understood that a cavity between the motor casing 220 and the stator 241 may form the circulation oil passage 262, the circulation oil passage 262 may extend in an axial direction of the motor assembly 200, an oil suction port of the oil pump assembly 100 is communicated with the circulation oil passage 262, and an oil discharge port of the oil pump assembly 100 is communicated with the general oil outlet 1020.

That is, the flow path of the oil is: the main oil inlet 1010, the circulating oil channel 262, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100 and the main oil outlet 1020 can convert low-pressure oil into high-pressure oil, heat of the motor assembly 200 can be taken away by circularly flowing oil, particularly a large amount of heat can be taken away by the stator 241, the stable work of the motor assembly 200 is ensured, the motor assembly 200 does not need to be provided with a heat dissipation unit independently, the size and the weight of the electric oil pump assembly 1000 can be reduced, and the circular flow is formed simply and is easy to manufacture.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the oil absorption of the oil pump assembly 100 and the heat dissipation of the motor assembly 200 are realized by arranging the circulating oil passage 262, so that the heat dissipation performance and the working stability of the electric oil pump assembly 1000 are improved, the integration level is high, and the light weight level is high.

According to the electric oil pump assembly 1000 of a preferred embodiment of the present invention, as shown in fig. 2, 6, 7, 11, 15, 16, 20, 23, 25, 28, 30, 33, 35, 38, the motor assembly 200 may include: front end cap 210, motor casing 220, rear end cap 230, stator 241 and rotor 242.

The rear end cover 230 closes the rear end of the motor casing 220 to form a rear cavity 261 of the liquid cooling cavity 260, the number of the circulation oil passages 262 may be plural, such as four in fig. 40, and the plural circulation oil passages 262 may be arranged at intervals in the circumferential direction, and the plural circulation oil passages 262 are communicated through the rear cavity 261. The rear cavity 261 is located between the rear end cover 230 and the stator 241, the motor shaft 250, and the rotor 242, and the rear cavity 261 communicates with the circulation oil passages 262, and particularly, a rear end of each circulation oil passage 262 may be connected to the rear cavity 261.

At least one of the plurality of circulation oil passages 262 is connected to the main oil inlet 1010, oil flows into the circulation oil passage 262 from the main oil inlet 1010 and flows to the rear cavity 261, oil in at least one circulation oil passage 262 of the plurality of circulation oil passages 262 flows from the rear to the front and is connected to the oil suction port, that is, oil in the circulation oil passage 262 flows from the rear cavity 261 to the front end cover 210 and then flows into the oil pump assembly 100 through the oil suction port, as shown in fig. 40, a part of oil in the circulation oil passage 262 of the plurality of circulation oil passages 262 flows from the rear to the front, another part of oil in the circulation oil passage 262 flows from the front to the rear, and two circulation oil passages 262 different in oil flow direction are arranged in a staggered manner in the circumferential direction. The plurality of circulation oil channels 262 may be designed in pairs, the flow direction of the oil may be designed in a staggered manner, and the oil circulates in the motor housing 220 to dissipate heat of the motor assembly 200.

In a specific embodiment, one of the plurality of circulation oil passages 262 (e.g., the uppermost circulation oil passage 262 in fig. 40) is connected to a main oil inlet 1010 to allow oil to flow into the hydraulic chamber 260 through one of the plurality of circulation oil passages 262, and the main oil inlet 1010 may be provided at an upper portion of the electric oil pump assembly 1000 to facilitate gas discharge when oil flows in.

As shown in fig. 2, 6, 7, 11, 15, 16, 20, 23, 25, 28, 30, 33, 35, and 38, the front head cover 210 may be provided with a through oil passage 214, and the circulation oil passage 262 and the oil suction port may communicate through the through oil passage 214.

The front cover 210 may have a support flange 211 protruding toward the rotor 242 of the motor assembly 200 in the axial direction, the support flange 211 may have a circular ring shape, the support flange 211 is used to support a bearing of the motor assembly 200, the support flange 211, the motor shaft 250, and the bearing of the motor assembly 200 together define an oil suction cavity 263, the oil suction cavity 263 is connected to an oil suction port, and the oil passage 214 may penetrate through the support flange 211 to communicate the oil suction cavity 263 with the circulation oil passage 262. The oil suction chamber 263 is equivalent to a buffer space for providing oil suction for the oil pump assembly 100, and the relatively closed space formed by the support flange 211 and the bearing can prevent oil turbulence in the liquid cooling chamber 260 caused by oil suction of the oil pump assembly 100.

Further, an oil baffle 271 may be disposed between the stator 241 and the front end cover 210, and the oil baffle 271 may be made of an oil-resistant material, such as linoleum, as shown in fig. 2, fig. 6, fig. 7, fig. 11, fig. 15, fig. 16, fig. 20, fig. 23, fig. 25, fig. 28, fig. 30, fig. 33, fig. 35, and fig. 38, where the oil baffle 271 may be annular and is sleeved outside the support flange 211, a portion of the stator 241 close to the front end cover 210 may be sleeved outside the oil baffle 271, and the oil baffle 271 may prevent the oil pump assembly 100 from directly sucking oil from a nearby cavity, so that oil flows well at all places in the motor assembly 200, and thus heat dissipation is balanced. It should be noted that, an area of the oil deflector 271 corresponding to the oil passage 214 may be hollowed out to prevent the oil deflector 271 from obstructing the oil pump assembly 100 from sucking oil through the oil passage 214.

Of course, there may be a gap between the stator 241 and the oil deflector 271, and a gap between the oil deflector 271 and the rotor 242, but the gap does not affect the overall flow direction of the oil. Thus, the general flow path of the oil can be ensured as follows: the main oil inlet 1010, the circulating oil channel 262, the rear cavity 261, the circulating oil channel 262, the oil passing channel 214, the oil suction cavity 263, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100 and the main oil outlet 1020.

EXAMPLE III

As shown in fig. 3, 8, 9, 12, 17, and 18, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: a motor assembly 200 and an oil pump assembly 100.

The motor assembly 200 of the electric oil pump assembly 1000 has an oil pump chamber 1030, the front end cover 210 of the motor assembly 200 defines the oil pump chamber 1030, the oil pump chamber 1030 is not limited by the front end cover 210 alone, the front end cover 210 may only define a part of the wall surface of the oil pump chamber 1030, the chamber of the motor assembly 200 is isolated from the oil pump chamber 1030, and the chamber of the motor assembly 200 is isolated from the oil pump chamber 1030 by the front end cover 210 of the motor assembly 200. The motor assembly 200 may be liquid-cooled (oil-cooled), and the cooling oil of the motor assembly 200 is separated from the oil of the oil pump assembly 100, for example, the motor assembly 200 may have a liquid-cooled chamber 260, and the liquid-cooled chamber 260 is isolated from the oil pump assembly 100, and specifically, the liquid-cooled chamber 260 may be isolated from the oil pump assembly 100 by the front end cover 210.

The oil pump assembly 100 is located in the oil pump cavity 1030, an oil suction port of the oil pump assembly 100 is communicated with the main oil inlet 1010, an oil discharge port of the oil pump assembly 100 is communicated with the main oil outlet 1020, and one of the main oil inlet 1010 and the main oil outlet 1020 is communicated with the oil pump cavity 1030.

Thus, the periphery of the oil pump assembly 100 is wrapped by the oil, and the vibration noise of the oil pump assembly 100 can be absorbed by the oil in the oil pump chamber 1030 and reflected by the wall surface of the oil pump chamber 1030, so as to reduce the operating noise of the electric oil pump assembly 1000.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the relatively independent oil pump cavity 1030 is arranged, so that the working noise of the oil pump assembly 100 can be effectively absorbed, the oil pump of the oil pump assembly 100 is not interfered by the flowing of the oil liquid in the motor assembly 200, the oil pumping efficiency of the electric oil pump assembly 1000 is higher, and the operation is stable.

As shown in fig. 18, the oil pump chamber 1030 is communicated with the main oil inlet 1010, and when the oil pump chamber 1030 is communicated with the main oil inlet 1010, the oil inlet of the oil pump assembly 100 can be communicated with the main oil inlet 1010 through the oil pump chamber 1030, and the oil outlet of the oil pump assembly 100 is communicated with the main oil outlet 1020.

The front end cover 210 may be provided with an oil outlet channel 212, one end of the oil outlet channel 212 is connected to an oil discharge port of the oil pump assembly 100, the other end of the oil outlet channel 212 forms a main oil outlet 1020, the front end cover 210 is further provided with an oil inlet channel 215, and the main oil inlet 1010 and the oil pump chamber 1030 are communicated through the oil inlet channel 215.

The flow path of the oil liquid is as follows: the main oil inlet 1010, the oil inlet channel 215, the oil pump cavity 1030, the oil inlet of the oil pump assembly 100, the oil outlet channel 212 and the main oil outlet 1020, so that low-pressure oil can be converted into high-pressure oil, the periphery of the oil pump assembly 100 is wrapped by the low-pressure oil, and vibration noise of the oil pump assembly 100 can be absorbed by the low-pressure oil in the oil pump cavity 1030 and reflected by the wall surface of the oil pump cavity 1030, so that the working noise of the electric oil pump assembly 1000 is reduced.

The pressure of the oil pump chamber 1030 is small, sealing is facilitated, the wall surface of the oil pump chamber 1030 does not have the function of a high-pressure container, the wall surface is not limited by the influence of strength, the possibility of light-weight design is provided, the wall surface of the oil pump chamber 1030 can be arranged to be thin, for example, the wall surface of the oil pump chamber 1030 can be made of thin-wall metal, and therefore the occupied space and the weight of the electric oil pump assembly 1000 are reduced.

The oil pump chamber 1030 according to an alternative embodiment of the present invention is communicated with the main oil inlet 1010, as shown in fig. 3, 8, 9, 12 and 17, the oil pump chamber 1030 is connected with an oil discharge port of the oil pump assembly 100, the oil pump chamber 1030 is communicated with the main oil outlet 1020, the oil discharge port of the oil pump assembly 100 can be communicated with the main oil outlet 1020 through the oil pump chamber 1030, and an oil suction port of the oil pump assembly 100 is communicated with the main oil inlet 1010.

The front end cover 210 is provided with an oil outlet channel 212 and an oil inlet channel 215, one end of the oil outlet channel 212 is connected with the oil pump cavity 1030, the other end of the oil outlet channel 212 forms a main oil outlet 1020, one end of the oil inlet channel 215 is communicated with the main oil inlet 1010, and the other end of the oil inlet channel 215 is connected with the oil suction port.

The flow path of the oil liquid is as follows: the main oil inlet 1010, the oil inlet channel 215, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100, the oil pump chamber 1030, the oil outlet channel 212 and the main oil outlet 1020, so that low-pressure oil can be converted into high-pressure oil.

In one aspect, the periphery of the oil pump assembly 100 is wrapped by the high-pressure oil, and the vibration noise of the oil pump assembly 100 can be absorbed by the high-pressure oil in the oil pump chamber 1030 and reflected by the wall surface of the oil pump chamber 1030, so as to reduce the operating noise of the electric oil pump assembly 1000.

On the other hand, oil pump chamber 1030 can play the role of eliminating oil pulsation and fluid noise reduction, and the elimination of various frequency noises can be realized by designing the size of oil pump chamber 1030.

In another aspect, the high-pressure oil in the oil pump chamber 1030 may apply an axial thrust P to the oil pump assembly 100, for example, the pressure applied by the high-pressure oil to the rear cover plate 120 of the oil pump assembly 100 may support the oil pump assembly 100 on the front end cover 210 of the motor assembly 200, so that the oil pump assembly 100 may receive an additional axial force during the operation process, the fixing manner of the oil pump assembly 100 is less restricted, and the oil pump assembly 100 may remain relatively stable and fixed during the operation process.

Example four

As shown in fig. 1, 2, 3, 19, 20, 29, and 30, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: motor assembly 200, oil pump assembly 100 and elastic member 311.

The oil pump assembly 100 is floatingly mounted at an end of the motor assembly 200, for example, the oil pump assembly 100 may be floatingly mounted on the front end cover 210 of the motor assembly 200, the oil pump assembly 100 may be floatingly mounted directly on the front end cover 210, or the oil pump assembly 100 may be indirectly floatingly mounted on the front end cover 210 through other mounting structures (such as a support plate), specifically, the front cover plate 110 of the oil pump assembly 100 may be supported on the front end cover 210 of the motor assembly 200, where the front cover plate 110 is a cover plate of a power input end of the oil pump assembly 100, that is, the oil pump shaft 130 extends from the front cover plate 110, and correspondingly, the rear cover plate 120 is a cover plate of the other end.

The elastic element 311 is elastically connected between the motor assembly 200 and the oil pump assembly 100, for example, the oil pump assembly 100 is floatingly mounted on the front end cover 210, the elastic element 311 may be elastically connected between the front end cover 210 and the oil pump assembly 100 to apply an axial pre-tightening force to the oil pump assembly 100 toward the motor assembly 200, or the elastic element 311 is in contact with or connected to the oil pump assembly 100 to apply an axial pre-tightening force to the oil pump assembly 100 to make the oil pump assembly 100 floatingly supported on the front end cover 210 of the motor assembly 200.

The oil pump assembly 100 is pre-pressed on the front end cover 210 of the motor assembly 200 under the elastic force of the elastic member 311, for example, the elastic member 311 may be connected between the housing of the oil pump assembly 100 and the front end cover 210 of the motor assembly 200 in an axially stretched manner, the housing of the oil pump assembly 100 may be provided with a lug 112 protruding radially outward, the lug 112 may be spaced from the front end cover 210 in an axially spaced manner, the elastic member 311 may be connected between the lug 112 and the front end cover 210 in an elastically stretched manner, or the elastic member 311 may be connected between the housing of the oil pump assembly 100 and the front end cover 210 of the motor assembly 200 in an axially compressed manner.

The elastic pretightening force of the elastic piece 311 on the oil pump assembly 100 ensures that the oil pump assembly 100 is pre-compressed on the front end cover 210 of the motor assembly 200, the sealing performance of the oil pump assembly 100 is ensured, the large-torque locking of a bolt on the oil pump assembly 100 is not required during assembly, the pretightening force provided by the elastic piece 311 only needs to ensure that the oil pump assembly 100 is installed, so that the working friction force of the oil pump assembly 100 can be reduced, the working energy efficiency of the oil pump assembly 100 is improved, and the mechanical efficiency of the oil pump assembly 100 is higher.

Because the oil pump assembly 100 is installed in a suspension manner, bolts are not required to be fixed on the shell, a certain amount of movable movement can be realized in the radial direction and the axial direction of the oil pump assembly 100 under the action of a certain force, when the motor shaft 250 of the motor assembly 200 rotates, the oil pump shaft 130 of the oil pump assembly 100 can be aligned in a self-adaptive manner, noise caused by the fact that the motor shaft 250, the coupler 410 and the oil pump shaft 130 are not aligned in a self-adaptive manner is effectively avoided, and due to the characteristic of the self-adaptive alignment, the machining precision requirements for machining the motor shaft 250, the coupler 410 and the oil pump shaft 130 can be reduced, so that the machining cost and the assembling precision requirements.

Further, the output pulse of the oil pump assembly 100 can overcome the elastic force of the elastic member 311, so that the oil pump assembly 100 is axially displaced, and the output pulse of the oil pump assembly 100 is reduced or even eliminated.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the elastic member 311 is arranged to pre-mount the oil pump assembly 100, and the oil pump assembly 100 is float-mounted, so that the working friction force of the oil pump assembly 100 can be reduced, the working energy efficiency of the oil pump assembly 100 is improved, the output pulse of the oil pump assembly 100 is reduced, and the electric oil pump assembly 1000 has the characteristic of self-adaptive centering, so that the requirements on the processing precision and the assembly precision of the electric oil pump assembly 1000 can be reduced.

According to the electric oil pump assembly 1000 of a preferred embodiment of the present invention, as shown in fig. 1, 2, 3, 19, 20, 29, and 30, the electric oil pump assembly 1000 may further include: a positioning member 312, the positioning member 312 being connected between the oil pump assembly 100 and the front cover 210, and the positioning member 312 being in clearance fit with at least one of the oil pump assembly 100 and the front cover 210 of the motor assembly 200 in a radial direction.

For example, in an alternative embodiment, the positioning member 312 may be fixedly connected to the oil pump assembly 100 (without radial play activity), and the positioning member 312 may be radially clearance-fitted with the front end cover 210; in another alternative embodiment, the positioning member 312 may be in clearance fit with the oil pump assembly 100 in the radial direction, and the positioning member 312 may be fixedly connected with the front end cover 210 (no radial clearance movement); in an alternative embodiment, the positioning member 312 may be radially clearance-fitted with the oil pump assembly 100, and the positioning member 312 may be radially clearance-fitted with the front head cover 210.

The positioning member 312 is used for pre-positioning and transmitting torque, and according to the clearance fit allowance of the positioning member 312 and the oil pump assembly 100 or the front end cover 210, the radial floating stroke of the oil pump assembly 100 can be limited, and the oil pump assembly 100 is ensured to be always near the radial central area.

Specifically, the positioning element 312 may be a bolt, the outer circumference of the oil pump assembly 100 may be provided with a lug 112, the lug 112 may be provided with a positioning hole, the bolt penetrates through the positioning hole, and the bolt is in threaded connection with the front end cover 210, and the bolt is in clearance fit with the positioning hole, so that the oil pump assembly 100 may float radially. Thus, the positioning element 312 is fixed in position relative to the motor assembly 200 in the axial direction, is not easy to fall off, and is more stable in torque transmission.

The elastic element 311 may be a spring, and the elastic element 311 is sleeved outside the bolt, and the spring elastically abuts between the lug 112 and the head of the bolt. During operation of the electric oil pump assembly 1000, the lug 112 may stop against the spring, and under a certain force applied to the oil pump assembly 100, the oil pump assembly 100 may axially float, so that the spring is further compressed toward the head of the bolt or the compression amplitude is reduced.

The formation of the lug 112 may be varied, for example, at least a portion of the edge of the front cover plate 110 of the oil pump assembly 100 extends radially outward to form the lug 112, so that the lug 112 substantially conforms to the front cover 210 of the motor assembly 200, and the pre-installation of the oil pump assembly 100 is more stable.

Alternatively, the lug 112 may be axially spaced from the front end cover 210, such as at least a portion of the rim of the circumferential housing of the oil pump assembly 100 extending radially outward to form the lug 112, in this embodiment, the elastic member 311 may be elastically stretched between the lug 112 and the front end cover 210, and of course, the elastic member 311 may also be elastically stopped between the lug 112 and the head of the bolt as in the above-described embodiments.

The positioning member 312 and the elastic member 311 may be provided in plurality, the lug 112 is also provided in plurality, the lugs 112 are arranged at intervals in the circumferential direction, the positioning members 312 are arranged at intervals in the circumferential direction of the oil pump assembly 100, the elastic members 311 are arranged at intervals in the circumferential direction of the oil pump assembly 100, preferably, the lugs 112 are arranged at even intervals in the circumferential direction, and the positioning members 312, the elastic members 311 and the lugs 112 correspond to one another. Thus, the pre-installation force of the oil pump assembly 100 in all directions in the circumferential direction is balanced, the oil pump assembly 100 floats in the axial direction in all directions, and the oil pump assembly floats in the radial direction in all directions, and is restrained in all directions.

EXAMPLE five

As shown in fig. 4 to 9, 21 to 23, and 31 to 33, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: motor assembly 200, oil pump assembly 100 and magnetic member 321.

The oil pump assembly 100 is floatingly mounted at an end of the motor assembly 200 in a radial direction, for example, the oil pump assembly 100 may be floatingly mounted on the front end cover 210 of the motor assembly 200 in the radial direction, the oil pump assembly 100 may be floatingly mounted on the front end cover 210 in the radial direction directly, or the oil pump assembly 100 may be floatingly mounted on the front end cover 210 in the radial direction indirectly through other mounting structures (such as a support plate), specifically, the front cover plate 110 of the oil pump assembly 100 may be supported on the front end cover 210 of the motor assembly 200, wherein the front cover plate 110 is a cover plate of a power input end of the oil pump assembly 100, that is, the oil pump shaft 130 extends from the front cover plate 110, and correspondingly.

The magnetic member 321 is used for applying an axial magnetic force to the oil pump assembly 100, so that the oil pump assembly 100 is supported on an end portion of the motor assembly 200 in a radial direction in a floating manner, for example, on the front end cover 210, and the magnetic member 321 may be a permanent magnet. For example, the magnetic member 321 may be fixedly connected to the motor assembly 200, and the oil pump assembly 100 is floatingly mounted at the end of the motor assembly 200 (the front end cap 210) in the radial direction by magnetic attraction of the oil pump assembly 100, or the magnetic member 321 may be fixedly connected to the oil pump assembly 100, and the oil pump assembly 100 is floatingly mounted at the end of the motor assembly 200 (the front end cap 210) in the radial direction by magnetic attraction of the motor assembly 200 and the magnetic attraction of the magnetic member 321 to the oil pump assembly 100 and the magnetic attraction of the motor assembly 200, so that the oil pump assembly 100 is floatingly mounted at the end of the motor assembly 200 (the front end cap.

Oil pump assembly 100 is installed on motor element 200 along radial floating, need not to carry out the big moment of torsion of bolt locking on oil pump assembly 100 when the assembly, the pretension magnetic attraction that magnetic part 321 provided only need guarantee oil pump assembly 100 install can, can reduce oil pump assembly 100's working friction like this, promote oil pump assembly 100's work efficiency, oil pump assembly 100's mechanical efficiency is higher.

Because the magnetic force adsorption is not mandatory limiting, the oil pump assembly 100 is installed in a suspension mode and does not need to be fixed on a shell through bolts, the oil pump assembly 100 can radially move by a certain amount under the action of a certain force, when the motor shaft 250 of the motor assembly 200 rotates, the oil pump shaft 130 of the oil pump assembly 100 can be aligned in a self-adaptive mode, noise caused by the fact that the motor shaft 250, the coupler 410 and the oil pump shaft 130 are not aligned in a self-adaptive mode is effectively avoided, due to the characteristic of the self-adaptive alignment, the machining precision requirements for machining the motor shaft 250, the coupler 410 and the oil pump shaft 130 can be lowered, and the machining cost and the assembling precision requirements of the electric oil pump.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the magnetic member 321 is arranged to pre-mount the oil pump assembly 100, and the oil pump assembly 100 is float-mounted, so that the working friction force of the oil pump assembly 100 can be reduced, the working energy efficiency of the oil pump assembly 100 is improved, the electric oil pump assembly 1000 has the characteristic of self-adaptive centering, and the requirements on the machining precision and the assembling precision of the electric oil pump assembly 1000 can be reduced.

According to the electric oil pump assembly 1000 of a preferred embodiment of the present invention, as shown in fig. 4, 6, 8, 21, 23, 31, and 33, the magnetic member 321 may be connected to one of the front cover plate 110 and the front cover 210 of the oil pump assembly 100, and the other of the front cover plate 110 and the front cover 210 may be made of a ferromagnetic material.

Optionally, the other of the front cover plate 110 and the front cover 210 is provided with a groove corresponding to the magnetic member 321, at least a portion of the magnetic member 321 protrudes from the one of the front cover plate 110 and the front cover 210 and is in clearance fit with the groove in the radial direction, and the rest of the magnetic member 321 is embedded in the one of the front cover plate 110 and the front cover 210.

For example, the magnetic member 321 may be fixedly connected to the front cover plate 110 of the oil pump assembly 100, a portion of the magnetic member 321 is embedded in the front cover plate 110, another portion protrudes from the front cover plate 110, a groove corresponding to the magnetic member 321 may be formed in the front end cover 210 of the motor assembly 200, a portion of the magnetic member 321 protruding from the front cover plate 110 may extend into the groove and radially and loosely fit with the groove, and the front end cover 210 of the motor assembly 200 may be made of a ferromagnetic material, such as a carbon steel material.

Alternatively, the magnetic member 321 may be fixedly connected to the front end cover 210 of the motor assembly 200, a portion of the magnetic member 321 is embedded in the front end cover 210, another portion protrudes from the front end cover 210, a groove corresponding to the magnetic member 321 may be formed on the front end cover 110 of the oil pump assembly 100, a portion of the magnetic member 321 protruding from the front end cover 210 may extend into the groove and radially and loosely fit with the groove, and the front end cover 110 of the oil pump assembly 100 may be made of a ferromagnetic material, such as a carbon steel material.

Optionally, the other of the front cover plate 110 and the front cover 210 is provided with a boss corresponding to the magnetic member 321, and the magnetic member 321 is provided with a groove, and the boss extends into the groove and is in clearance fit with the groove along the radial direction.

For example, the magnetic member 321 may be fixedly connected to the front cover plate 110 of the oil pump assembly 100, the front end cover 210 of the motor assembly 200 may be provided with a boss corresponding to the magnetic member 321, the magnetic member 321 is provided with a groove corresponding to the boss, the boss may extend into the groove and be in clearance fit with the groove along the radial direction, and the front end cover 210 of the motor assembly 200 may be made of a ferromagnetic material, such as a carbon steel material.

Alternatively, the magnetic member 321 may be fixedly connected to the front end cover 210 of the motor assembly 200, a boss corresponding to the magnetic member 321 may be disposed on the front cover plate 110 of the oil pump assembly 100, a groove corresponding to the boss is disposed on the magnetic member 321, the boss may extend into the groove and be in clearance fit with the groove along the radial direction, and the front cover plate 110 of the oil pump assembly 100 may be made of a ferromagnetic material, such as a carbon steel material.

It will be appreciated that the magnetic member 321 may be used for pre-positioning and torque transmission, and that, depending on the clearance fit allowance of the magnetic member 321 with the corresponding boss or groove, the radial floating stroke of the oil pump assembly 100 may be limited and the oil pump assembly 100 is ensured to be always near the radial center area.

The magnetic member 321 may be a plurality of magnetic members 321 arranged at intervals in the circumferential direction, and preferably, the magnetic members 321 may be arranged at even intervals in the circumferential direction between the front cover 210 and the front cover plate 110. Thus, the pre-installation force of the oil pump assembly 100 in all directions in the circumferential direction is balanced, and the constraint in all directions is balanced when the oil pump assembly floats in the radial direction.

As shown in fig. 5, 7, 9, 22 and 32, the electric oil pump assembly 1000 according to another preferred embodiment of the present invention includes: the oil pump chamber 1030, the oil pump assembly 100 is installed in the oil pump chamber 1030, the oil pump chamber 1030 is connected with the oil discharge port of the oil pump assembly 100, and the oil pump chamber 1030 is communicated with the oil outlet 1020.

Thus, on the one hand, the periphery of the oil pump assembly 100 is wrapped by the high-pressure oil, and the vibration noise of the oil pump assembly 100 can be absorbed by the high-pressure oil in the oil pump chamber 1030 and reflected by the wall surface of the oil pump chamber 1030, so as to reduce the operating noise of the electric oil pump assembly 1000.

In yet another aspect, the high pressure oil in the oil pump chamber 1030 may apply an axial thrust to the oil pump assembly 100, for example, the pressure applied by the high pressure oil to the back cover plate 120 of the oil pump assembly 100 may support the oil pump assembly 100 on the front cover 210 of the motor assembly 200, such that the oil pump assembly 100 may be subjected to an additional axial force during operation, and the oil pump assembly 100 may remain relatively stable and stationary during operation.

The oil pump assembly 100 and the front end cover 210 can be pre-positioned by the positioning unit 322, the positioning unit 322 is in clearance fit with at least one of the oil pump assembly 100 and the front end cover 210 in the radial direction, and the back cover plate 120 of the oil pump assembly 100 and the top wall 1031 of the oil pump chamber 1030 are respectively provided with magnetic members 321 with opposite magnetic pole directions.

For example, the positioning unit 322 may be radially clearance-fitted with the front cover plate 110 of the oil pump assembly 100, and the positioning unit 322 may be embedded in the front cover 210; or the positioning unit 322 may be radially clearance-fitted with the front end cover 210, and the positioning unit 322 may be embedded in the front cover plate 110 of the oil pump assembly 100; or as in the embodiments shown in fig. 5, 7, 9, 22, and 32, the positioning unit 322 may be radially clearance-fitted with the front cover plate 110 of the oil pump assembly 100, and the positioning unit 322 may be radially clearance-fitted with the front end cover 210. The positioning unit 322 may be a cylindrical pin.

It should be noted that the magnetic member 321 on the back cover plate 120 of the oil pump assembly 100 may be embedded into the back cover plate 120, and the magnetic member 321 on the top wall 1031 of the oil pump chamber 1030 may be embedded into the top wall 1031 of the oil pump chamber 1030, and the same magnetic poles of the magnetic members 321 at the two positions are oppositely arranged, for example, N pole to N pole, S pole to S pole, preferably, the magnetic members 321 at the two positions are oppositely arranged, and of course, if the back cover plate 120 and the front cover 210 of the oil pump assembly 100 are made of ferromagnetic material, the magnetic members 321 at the two positions may also be arranged in a staggered manner.

The magnetic member 321 may be a plurality of magnetic members 321 arranged at intervals in the circumferential direction, and preferably, the magnetic members 321 are arranged at even intervals in the circumferential direction between the rear cover plate 120 and the top wall 1031 of the oil pump chamber 1030. Thus, the pre-installation force of the oil pump assembly 100 in all directions in the circumferential direction is balanced, and the constraint in all directions is balanced when the oil pump assembly floats in the radial direction.

EXAMPLE six

As shown in fig. 10 to 12, 24, 25, 34, 35, and 41, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: motor assembly 200, oil pump assembly 100 and fastener 331.

The buckle 331 is connected between the oil pump assembly 100 and the motor assembly 200, one of the oil pump assembly 100 and the motor assembly 200 is in clearance fit with the buckle 331, and the other of the oil pump assembly 100 and the motor assembly 200 is fixedly connected with the buckle 331, so that the oil pump assembly 100 is floatingly supported at the end of the motor assembly 200.

For example, the oil pump assembly 100 is floatingly mounted on the front end cover 210, the buckle 331 is connected between the oil pump assembly 100 and the front end cover 210, one of the oil pump assembly 100 and the front end cover 210 is in clearance fit with the buckle 331, and the other of the oil pump assembly 100 and the front end cover 210 is fixedly connected with the buckle 331, so that the oil pump assembly 100 is floatingly supported on the front end cover 210.

For example, the buckle 331 may be fixedly connected to the front cover plate 110 of the oil pump assembly 100, one end of the buckle 331 is embedded into the front cover plate 110, and the buckle 331 is in clearance fit with the front end cover 210 of the motor assembly 200; alternatively, the latch 331 may be fixedly connected to the front cover 210 of the motor assembly 200, one end of the latch 331 is embedded in the front cover 210, and the latch 331 is in clearance fit with the front cover 110 of the oil pump assembly 100.

The oil pump assembly 100 is floatingly mounted at the end of the motor assembly 200, the buckle 331 is connected between the oil pump assembly 100 and the front motor assembly 200, one of the oil pump assembly 100 and the motor assembly 200 is in clearance fit with the buckle 331, and the other of the oil pump assembly 100 and the motor assembly 200 is fixedly connected with the buckle 331, so that the oil pump assembly 100 is floatingly supported on the motor assembly 200.

Such as a snap 331, is connected between the front end cap 210 and the oil pump assembly 100 to achieve the functions of limiting, pre-positioning and transmitting torque, wherein the limiting includes axial and radial limiting, and it should be noted that the limiting described herein is not necessarily limited to being locked, but limits a certain amount of movable movement of the oil pump assembly 100 in the axial and/or radial direction.

Oil pump assembly 100 is pre-installed on motor element 200's front end housing 210 under buckle 331's axial limiting, need not to carry out bolt big moment of torsion locking on oil pump assembly 100 when the assembly, the pretightning force that buckle 331 provided or limit in advance only need guarantee oil pump assembly 100 install can, can reduce oil pump assembly 100's work frictional force like this, promote oil pump assembly 100's work efficiency, oil pump assembly 100's mechanical efficiency is higher.

Because the oil pump assembly 100 is installed in a suspension manner, bolts are not required to be fixed on the shell, the oil pump assembly 100 can have a certain amount of movement in the radial direction and the axial direction under the action of a certain force, when the motor shaft 250 of the motor assembly 200 rotates, the oil pump shaft 130 of the oil pump assembly 100 can be aligned in a self-adaptive manner, noise caused by the fact that the motor shaft 250, the coupler 410 and the oil pump shaft 130 are not aligned in a self-adaptive manner is effectively avoided, the machining precision requirements for machining the motor shaft 250, the coupler 410 and the oil pump shaft 130 can be reduced due to the characteristic of the self-adaptive alignment, and the machining cost and the assembly precision requirements of the electric oil pump.

Further, the output pulse of the oil pump assembly 100 can overcome the elastic force of the buckle 331, so that the oil pump assembly 100 is axially displaced, and the output pulse of the oil pump assembly 100 is reduced or even eliminated.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the oil pump component 100 is pre-installed by arranging the fastener 331, and the oil pump component 100 is installed in a floating manner, so that the working friction force of the oil pump component 100 can be reduced, the working energy efficiency of the oil pump component 100 is improved, the output pulse of the oil pump component 100 is reduced, and the electric oil pump assembly 1000 has the characteristic of self-adaptive centering, so that the requirements on the processing precision and the assembling precision of the electric oil pump assembly 1000 can be reduced.

According to the electric oil pump assembly 1000 of a preferred embodiment of the present invention, as shown in fig. 10-12, 24, 25, 34, 35 and 41, one end of the buckle 331 is fixedly connected to the front cover 210, for example, the end of the buckle 331 can be embedded into the front cover 210, the other end of the buckle 331 is provided with a hook 332, the hook 332 is clamped with the front cover 110 of the oil pump assembly 100, and the hook 332 axially limits the front cover 110. For example, at least a portion of the catch 332 may coincide with at least a portion of the front cover plate 110 in the axial movement path of the oil pump assembly 100.

Specifically, as shown in fig. 41, the front cover plate 110 may be provided with a snap groove 111, the snap groove 111 may be in a ring shape (circular ring shape, square ring shape, or ring shape with other shapes), or the snap groove 111 may be a notch in the embodiment shown in fig. 41.

The buckle 331 penetrates the clamping groove 111, and the buckle 331 is in clearance fit with the clamping groove 111, so that the oil pump assembly 100 can float in the radial direction, namely, a certain movable amount exists in the radial direction, when the motor shaft 250 of the motor assembly 200 rotates, the oil pump shaft 130 of the oil pump assembly 100 can be aligned in a self-adaptive manner, and noise caused by the fact that the motor shaft 250, the coupler 410 and the oil pump shaft 130 are not aligned is effectively avoided.

The end face of the hook 332 facing the front end cover 210 is in clearance fit with the front cover plate 110 of the oil pump assembly 100, so that the oil pump assembly 100 has a small floating amount in the axial direction, the oil pump assembly 100 is not blocked in the axial direction, radial floating of the oil pump assembly 100 is not hindered, and due to the fact that the installation pressure between the oil pump assembly 100 and the motor assembly 200 is small, the working friction force of the oil pump assembly 100 can be reduced, the working energy efficiency of the oil pump assembly 100 is improved, and the mechanical efficiency of the oil pump assembly 100 is higher.

The edge of the front cover plate 110 has a lug 112 protruding outward in the radial direction, the snap-in groove 111 is provided on the lug 112, the snap-in groove 111 may be a closed ring shape on the lug 112, or may be formed by providing a notch on the lug 112, the end surface of the snap hook 332 facing the front cover plate 210 is disposed opposite to the surface of the lug 112 facing away from the front cover plate 210, the snap hook 332 has a guide surface 333, the guide surface 333 is inclined in the radial direction of the front cover plate 110 from inside to outside in the direction away from the front cover plate 210, and the guide surface 333 may be an inclined surface.

The latch 331 may be substantially rod-shaped, so that the latch 331 has good elasticity in the radial direction, and the latch 331 may be made of plastic or metal having certain elasticity.

As shown in fig. 41, when the oil pump assembly 100 is installed, the edge of the snap groove 111 facing the front end cover 210 acts on the guide surface 333 on the hook 332, the buckle 331 is elastically deformed and outwardly bent, after the snap groove 111 passes over the barb of the buckle 331, the buckle 331 rebounds, the front cover plate 110 of the oil pump assembly 100 is limited by the hook 332, the oil pump assembly 100 is relatively fixed, and at this time, the buckle 331 and the snap groove 111 are in clearance fit, the oil pump assembly 100 has a certain amount of movement space in the radial direction and the axial direction, and the oil pump assembly 100 can have a certain amount of movement in the radial direction and the axial direction under the action of a certain external force.

As shown in fig. 41, the number of the buckles 331 may be multiple, the number of the lugs 112 may also be multiple, the multiple lugs 112 are arranged at intervals in the circumferential direction, the multiple buckles 331 are arranged at intervals in the circumferential direction, preferably, the lugs 112 may be arranged at even intervals in the circumferential direction, and the multiple buckles 331 and the multiple lugs 112 correspond to each other one by one. Thus, the pre-installation force of the oil pump assembly 100 in all directions in the circumferential direction is balanced, the oil pump assembly 100 floats in the axial direction in all directions, and the oil pump assembly floats in the radial direction in all directions, and is restrained in all directions.

EXAMPLE seven

As shown in fig. 13 to 18, 26 to 28, and 36 to 38, an electric oil pump assembly 1000 according to an embodiment of the present invention includes: a motor assembly 200 and an oil pump assembly 100.

The motor assembly 200 has an oil pump chamber 1030, the motor assembly 200 includes a front cover 210, the front cover 210 can be used to define the oil pump chamber 1030, the oil pump chamber 1030 is filled with oil, the oil pump chamber 1030 is not limited by the front cover 210 alone, and the front cover 210 can only define a portion of the wall of the oil pump chamber 1030.

The oil pump assembly 100 is fixedly connected with the motor assembly 200, for example, the oil pump assembly 100 may be fixedly connected with the front end cover 210 of the motor assembly 200, the oil pump assembly 100 is located in the oil pump chamber 1030, an oil suction port of the oil pump assembly 100 is communicated with the main oil inlet 1010, and an oil discharge port of the oil pump assembly 100 is communicated with the main oil outlet 1020.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the periphery of the oil pump assembly 100 is wrapped by the oil, and the vibration noise of the oil pump assembly 100 can be absorbed by the oil in the oil pump chamber 1030 and reflected by the wall surface of the oil pump chamber 1030, so as to reduce the working noise of the electric oil pump assembly 1000.

Further, as shown in fig. 13-16, 26-28, and 36-38, the motor assembly 200 may further have a liquid cooling chamber 260, the liquid cooling chamber 260 is communicated with a main oil inlet 1010, the liquid cooling chamber 260 may be a vacant space in a compartment of the motor assembly 200, oil flows into the liquid cooling chamber 260 through the main oil inlet 1010, and the oil is filled in the liquid cooling chamber 260, which is equivalent to that components (such as the stator 241, the rotor 242, and the like) inside the motor assembly 200 are immersed in the oil.

An oil suction port of the oil pump assembly 100 is communicated with the liquid cooling chamber 260, and an oil discharge port of the oil pump assembly 100 is communicated with the main oil outlet 1020.

That is, the flow path of the oil is: the main oil inlet 1010, the hydraulic cooling cavity 260, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100 and the main oil outlet 1020 can convert low-pressure oil into high-pressure oil, heat of the motor assembly 200 can be taken away by circularly flowing oil, the motor assembly 200 is guaranteed to work stably, a heat dissipation unit does not need to be arranged on the motor assembly 200 independently, the size and the weight of the electric oil pump assembly 1000 can be reduced, and the circular flow is simple to form and easy to manufacture.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the liquid cooling cavity 260 communicated with the oil pump assembly 100 is arranged to realize oil absorption of the oil pump assembly 100 and heat dissipation of the motor assembly 200, so that the heat dissipation performance and the working stability of the electric oil pump assembly 1000 are improved, the integration level is high, and the light weight level is high.

In a specific embodiment, as shown in fig. 13-18, 26-28, and 36-38, the oil pump assembly 100 and the front end cap 210 may be fixedly connected by a threaded connection 341. For example, the edge of the front cover plate 110 of the oil pump assembly 100 has a lug 112 protruding outward in the radial direction, and the screw 341 penetrates the lug 112 and is screwed with the front cover 210.

Thus, the oil pump assembly 100 is firmly and conveniently connected with the motor assembly 200, and the friction force of bolt tightening can stably transmit torque.

As shown in fig. 41, there may be a plurality of bolts, a plurality of lugs 112 arranged at intervals in the circumferential direction, and a plurality of bolts arranged at intervals in the circumferential direction, and preferably, the lugs 112 may be arranged at even intervals in the circumferential direction, and the plurality of bolts and the plurality of lugs 112 correspond to each other one by one. Thus, the mounting force of the oil pump assembly 100 in all directions in the circumferential direction is balanced, and the transmission of the torque is more stable.

Further, the oil pump assembly 100 and the front cover 210 may be positioned by a positioning structure (not shown in the drawings). The positioning structure serves to ensure the coaxiality of the oil pump shaft 130 of the oil pump assembly 100 and the motor shaft 250 of the motor assembly 200.

In some alternative embodiments, the positioning structure may be a positioning pin, and both ends of the positioning pin respectively extend into the positioning grooves on the front cover plate 110 and the front cover 210 of the oil pump assembly 100.

In other alternative embodiments, the positioning structure may be a positioning boss protruding from the front end cover 210, and the front cover plate 110 of the oil pump assembly 100 is provided with a positioning groove, and the positioning boss protrudes into the positioning boss to realize the positioning of the oil pump assembly 100.

In further alternative embodiments, the positioning structure may be a positioning boss protruding from the front cover plate 110 of the oil pump assembly 100, and the front end cover 210 of the motor assembly 200 may be provided with a positioning groove, and the positioning boss protrudes into the positioning boss to position the oil pump assembly 100.

It should be noted that, the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment and the seventh embodiment can be further combined with the following features to form a new embodiment.

As shown in fig. 1 to 38, the total oil inlet 1010 may be disposed on the front end cover 210, specifically, the total oil inlet 1010 may be disposed above the front end cover 210, the total oil inlet 1010 may be disposed at the highest point of the entire electric oil pump assembly 1000, when oil flows, residual gas in the electric oil pump assembly 1000 may be smoothly discharged upward, and in some embodiments where the electric oil pump assembly 1000 has the liquid cooling chamber 260, the total oil inlet 1010 may be communicated with the circulation oil passage 262.

As shown in fig. 1 to 38, the electric oil pump assembly 1000 may have: the oil pump chamber 1030, the oil pump assembly 100 is installed in the oil pump chamber 1030, and the oil pump chamber 1030 is filled with oil.

The oil pump chamber 1030 may be formed in various manners, for example, a separate barrel defining the oil pump chamber 1030 and fixedly connected to the front end cover 210 of the motor assembly 200, or a part of the peripheral wall of the oil pump chamber 1030 may be integrally formed with the front end cover 210 to reduce the number of assembling processes of the electric oil pump assembly 1000.

For example, as shown in fig. 1 to 38, the front cover 210 may have an annular boss 213 extending in a direction axially away from the motor assembly 200, the annular boss 213 may form a side wall of the oil pump chamber 1030, the side wall of the oil pump chamber 1030 may be barrel-shaped with both ends open, the side wall of the oil pump chamber 1030 surrounds the oil pump assembly 100, the front cover 210 itself is connected to one end of the side wall of the oil pump chamber 1030 to form a bottom wall of the oil pump chamber 1030, and the top wall 1031 of the oil pump chamber 1030 and the annular boss 213 may be connected by a screw fastener to close the other end of the oil pump chamber 1030. Thus, the oil pump assembly 100 is conveniently installed.

As shown in fig. 1 to 38, a sealing ring may be interposed between the oil pump assembly 100 and the front end cover 210, and the sealing ring may be a rubber ring or the like, and may prevent oil in the oil pump chamber 1030 from leaking, and may isolate the oil pump chamber 1030 from a compartment of the motor assembly 200.

It should be noted that the bottom wall and the top wall are not limited to the up-down direction, but from the assembling perspective of the oil pump assembly 100, the wall surface supporting the oil pump assembly 100 is the bottom wall, and the wall surface opposite to the bottom wall is the top wall, for example, in the embodiment shown in fig. 1 to 38, the electric oil pump assembly 1000 is horizontal, the motor assembly 200 and the oil pump assembly 100 are both horizontal, and the left side wall surface of the oil pump assembly 100 is the bottom wall, and the right side wall surface is the top wall.

The front cover 210 and the annular boss 213 may be made of an aluminum alloy to reduce the total weight of the electric oil pump assembly 1000, and the top wall 1031 of the oil pump chamber 1030 may be made of a steel member, so that the top wall 1031 of the oil pump chamber 1030 may be made thinner to meet the strength requirement, and the axial space of the electric oil pump assembly 1000 may be more compact.

In some alternative embodiments, as shown in fig. 14, 16, 18, 27 and 37, the oil pump chamber 1030 may be communicated with the main oil inlet 1010, the oil suction port of the oil pump assembly 100 may be connected with the oil pump chamber 1030, the front end cover 210 is provided with the oil outlet channel 212, one end of the oil outlet channel 212 is connected with the oil discharge port of the oil pump assembly 100, and the other end of the oil outlet channel 212 forms the main oil outlet 1020.

For example, in the embodiment shown in fig. 14 and 16, the annular boss 213 may be provided with an oil pump chamber inlet and an oil pump chamber outlet, the oil enters the oil pump chamber 1030 from the oil pump chamber inlet, flows out of the oil pump chamber outlet to the liquid cooling chamber 260 of the motor assembly 200, and is sucked into the oil pump assembly 100 through the oil suction port, and the oil pump assembly 100 converts the oil from a low pressure to a high pressure and then discharges the oil to the oil outlet 1020 through the oil discharge port via the oil discharge passage 212.

That is, the flow direction of the oil is: the motor assembly 200 has the advantages that the main oil inlet 1010, the oil pump cavity 1030, the hydraulic cooling cavity 260, the oil suction port of the oil pump assembly 100, the oil discharge port of the oil pump assembly 100, the oil outlet channel 212 and the main oil outlet 1020 are arranged, so that low-pressure oil can be converted into high-pressure oil, heat of the motor assembly 200 can be taken away by the circularly flowing oil, the working stability of the motor assembly 200 is guaranteed, a heat dissipation unit does not need to be arranged in the motor assembly 200 independently, and the size and the weight of the electric oil pump assembly 1000 can be reduced.

Because the fluid of filling in oil pump chamber 1030 is low pressure oil, oil pump chamber 1030 pressure is little, and is convenient for seal, and there is not high-pressure vessel's effect in the wall in oil pump chamber 1030, need not be limited by the influence of intensity, provides the possibility of lightweight design, and what oil pump chamber 1030's wall can set up is thinner, for example oil pump chamber 1030's wall can be made by thin wall metal to reduce electric oil pump assembly 1000's occupation space and weight.

It should be noted that, preferably, in the embodiment in which the oil pump chamber 1030 is filled with low-pressure oil, the housing of the oil pump assembly 100 is fixedly connected with the motor assembly 200, for example, the housing may be fixedly connected by the bolt connection manner described in the seventh embodiment.

In other alternative embodiments, as shown in fig. 1-13, 15, 17, 19-26, 28-36 and 38, the oil pump chamber 1030 is connected to the oil discharge port of the oil pump assembly 100, and the oil pump chamber 1030 is communicated with the total oil outlet 1020, the front end cover 210 may be provided with the oil outlet passage 212, one end of the oil outlet passage 212 is connected to the oil pump chamber 1030, and the other end of the oil outlet passage 212 forms the total oil outlet 1020.

The flow path of the oil liquid is as follows: the main oil inlet 1010, the oil inlet of the oil pump assembly 100, the oil outlet of the oil pump assembly 100, the oil pump cavity 1030, the oil outlet channel 212 and the main oil outlet 1020, so that low-pressure oil can be converted into high-pressure oil.

In the embodiments shown in fig. 1, 4, 5, 10, 13, 19, 20, 21, 24, 26, 29, 31, 32, 34 and 36, the oil inlet 1010 and the oil suction port may be communicated through the liquid cooling cavity 260 and the motor shaft oil passage 251.

In the embodiments shown in fig. 2, 6, 7, 11, 15, 23, 25, 28, 30, 33, 35 and 38, the oil inlet 1010 and the oil suction opening can communicate with each other through the liquid cooling chamber 260.

In the embodiment shown in fig. 3, 8, 9, 12 and 17, the main oil inlet 1010 and the oil suction opening can communicate with each other through the oil inlet channel 215 of the front end cover 210.

On the one hand, oil pump chamber 1030 can play the role of eliminating oil pulsation and fluid noise reduction, and the elimination of various frequency noises can be realized by designing the size of oil pump chamber 1030.

On the other hand, the high-pressure oil in the oil pump chamber 1030 may apply an axial thrust P to the oil pump assembly 100, for example, the pressure P applied by the high-pressure oil to the rear cover plate 120 of the oil pump assembly 100 may support the oil pump assembly 100 on the front end cover 210 of the motor assembly 200, so that the oil pump assembly 100 may receive an additional axial force during the operation, and the oil pump assembly 100 may be relatively stable and fixed during the operation.

It should be noted that, preferably, when the oil pump assembly 100 is floatingly installed, the oil pump chamber 1030 is communicated with the oil discharge port of the oil pump assembly 100.

As in the embodiment shown in fig. 29-38, the electric oil pump assembly 1000 may further include: the noise enclosure 510, the noise enclosure 510 can be covered outside the outer wall of the oil pump chamber 1030, for example, the noise enclosure 510 covers the outer wall of the oil pump chamber 1030, so as to further insulate the operating noise of the oil pump assembly 100.

The sound-proof housing 510 can be made of sound-proof materials, and can be made of sound-proof materials with corresponding frequency spectrums according to the frequency spectrum characteristics of noise, so that the noise is reduced.

As in the embodiment shown in fig. 1-18, the electric oil pump assembly 1000 may further include: and the low-pressure cover 520, the low-pressure cover 520 can be covered outside the wall surface of the oil pump cavity 1030 and defines a low-pressure cavity 1040 communicated with the main oil inlet 1010, and the low-pressure cover 520 is connected with the front end cover 210, for example, the low-pressure cover 520 can be connected with the front end cover 210 in a clamping mode.

The low pressure chamber 1040 may be filled with low pressure oil to further absorb the operating noise of the oil pump assembly 100, the main oil inlet 1010 may be directly connected to the low pressure chamber 1040, and the oil in the liquid cooling chamber 260 or the oil inlet passage 215 may be connected to the main oil inlet 1010 through the low pressure chamber 1040.

The low pressure cover 520 may be made of a material having a smooth inner surface and a hole in the middle, so that the low pressure cover 520 has a strong reflection capability and a good absorption effect on noise. In some embodiments, the low pressure cover 520 may be made of a plastic or metal nylon composite, which is a composite of a nylon substrate with a metal mesh added to the nylon substrate.

The low pressure cover 520 may have a tapered peripheral wall, the low pressure cover 520 is transversely installed, and the inner diameter of the low pressure cover 520 is gradually reduced from a position close to the inlet 1010 to a position far away from the inlet 1010, so that the residual gas in the low pressure chamber 1040 can be discharged toward the inlet 1010 along the tapered surface, and the residual gas in the low pressure cover 520 can be completely discharged when the electric oil pump assembly 1000 is in operation.

In the embodiment shown in fig. 1-38, the motor assembly 200 and the oil pump assembly 100 are transverse. Thus, the influence of the self weight of the oil pump assembly 100 on the assembling pressure between the oil pump assembly 100 and the motor assembly 200 can be eliminated, and the electric oil pump assembly 1000 is small in height and convenient to arrange on a vehicle.

As shown in fig. 1 to 38, the oil pump shaft 130 of the oil pump assembly 100 and the motor shaft 250 of the motor assembly 200 may be coupled by a coupling 410, the coupling 410 is used to transmit torque, that is, the motor shaft 250 may drive the oil pump shaft 130 to rotate by the coupling 410, and the coupling 410 has various structural forms, such as a sliding block coupling, an articulated coupling, a gear coupling, and the like.

In a preferred embodiment, as shown in fig. 42, the shaft coupling 410 has a coupling hole 411, the motor shaft 250 has a first key, the oil pump shaft 130 has a second key, the first key is fitted with the coupling hole 411, the second key is fitted with the coupling hole 411, and the first key and the second key have overlapping sections in the axial direction.

That is, the coupling hole 411 may include two parts staggered from each other to respectively cooperate with the motor shaft 250 and the oil pump shaft 130, and the length of the three parts, i.e., the motor shaft 250, the coupling 410 and the oil pump shaft 130 after cooperation is less than the sum of the lengths of the motor shaft 250 and the oil pump shaft 130, so that the axial length of the coupling 410 is short, and the axial length of the coupling 410 can be shortened by half, so that the axial space of the electric oil pump assembly 1000 is more compact.

Specifically, the coupling hole 411 may be a cross-shaped hole penetrating through the coupling 410, the coupling 410 may be cylindrical, and the coupling hole 411 may be axially opened in the middle of the coupling 410. The first key and the second key can be in a shape of a Chinese character 'yi', the shape of the Chinese character 'yi' includes a continuous strip and also includes a discontinuous strip, and the middle part of at least one of the first key and the second key is provided with an avoidance groove.

In this way, the first key and the second key can be axially overlapped without interference, and the torque is transmitted from the side of the first key of the motor shaft 250 to the coupling 410, and the coupling 410 transmits the torque to the side of the second key of the oil pump shaft 130. Since the torsional shear force of the motor shaft 250 or the oil pump shaft 130 is gradually reduced from the shaft surface to the center when transmitting torque, and is zero at the center, the strength of the key is less affected by the avoidance groove provided at the middle of the key.

When the avoidance groove is formed in a selected key, the avoidance groove can be selected according to the diameter of the shaft, and if the diameter of the oil pump shaft 130 is smaller than that of the motor shaft 250, the avoidance groove is formed in the middle of the first key; if the diameter of the oil pump shaft 130 is greater than the diameter of the motor shaft 250, the middle portion of the second key has an escape groove. Thus, the influence of the opening avoiding groove on the strength of the shaft can be further reduced. Of course, in a specific embodiment, as shown in fig. 42, the first key and the second key may be formed with an avoiding groove at the middle portion thereof to prevent the motor shaft 250 or the oil pump shaft 130 from directly contacting.

In the description herein, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples, such as various mounting arrangements of the oil pump assembly 100 (including floating mounting via the resilient member 311, floating mounting via the snap 331, floating mounting via the magnetic member 321, fixed mounting via the threaded connector 341), various cooling arrangements or oil delivery arrangements of the motor assembly 200 (including oil delivery via the motor shaft oil passage 251, oil delivery via the liquid cooling chamber 260, isolated cooling) may be combined with one another to arrive at a new embodiment.

For example, the features of the first embodiment and the fourth embodiment can be combined to obtain the embodiments shown in fig. 1, 19 and 29.

The features of the first embodiment and the fifth embodiment can be combined to obtain the embodiments shown in fig. 4, 5, 21, 22, 31 and 32.

The features of the first embodiment and the sixth embodiment can be combined to obtain the embodiments shown in fig. 10, 24 and 34.

The features of the first and seventh embodiments may be combined to obtain the embodiments shown in fig. 13, 14, 26, 27, 36 and 37.

The features of the second embodiment and the fourth embodiment are combined to obtain the embodiments shown in fig. 2, 20 and 30.

The features of the second embodiment and the fifth embodiment can be combined to obtain the embodiments shown in fig. 6, 7, 23 and 33.

The features of the second embodiment and the sixth embodiment can be combined to obtain the embodiments shown in fig. 11, 25 and 35.

The features of the second and seventh embodiments can be combined to obtain the embodiments shown in fig. 15, 16, 28 and 38.

In the embodiment shown in fig. 15, 16, 28, and 38, the motor assembly 200 has a liquid cooling chamber 260, the liquid cooling chamber 260 may be communicated with a main oil inlet 1010, oil is sucked into the oil pump assembly 100 through the liquid cooling chamber 260, the liquid cooling chamber 260 may be a vacant space in a cabin of the motor assembly 200, oil flows into the liquid cooling chamber 260 through the main oil inlet 1010, and the oil is filled in the liquid cooling chamber 260, which is equivalent to that components (such as the stator 241, the rotor 242, and the like) inside the motor assembly 200 are soaked in the oil.

As shown in fig. 15, 16, 28, and 38, the motor assembly 200 may include: front end cap 210, motor casing 220, rear end cap 230, stator 241 and rotor 242.

The front end cover 210 is installed at the front end of the motor casing 220, for example, the front end cover 210 may be connected to the front end of the motor casing 220 by a threaded fastener, and the rear end cover 230 closes the rear end of the motor casing 220, for example, the rear end cover 230 may be connected to the rear end of the motor casing 220 by a threaded fastener, where it should be noted that the front end represents an output end (a right end in fig. 15) of the motor assembly 200, and the rear end represents an end (a left end in fig. 15) axially far away from the output end.

In a specific embodiment, one of the plurality of circulation oil passages 262 is connected to a main oil inlet 1010 to allow oil to flow into the hydraulic chamber 260 through one of the plurality of circulation oil passages 262, and the main oil inlet 1010 may be provided at an upper portion of the electric oil pump assembly 1000 to facilitate gas discharge when oil flows in.

Other related technical features of the liquid cooling chamber 260 can be referred to the description of the second embodiment, and are not repeated herein.

The specific connection manner of the oil pump assembly 100 and the front end cover 210 can refer to the description of the seventh embodiment, and is not described herein again.

According to the electric oil pump assembly 1000 of the embodiment of the invention, the oil absorption of the oil pump assembly 100 is realized by the fixed connection mode and the arrangement of the liquid cooling cavity 260, the oil pump assembly 100 is firmly assembled, the output pulse of the oil pump assembly 100 can be reduced, the heat radiation performance and the working stability of the electric oil pump assembly 1000 are improved, the integration level is high, and the light weight level is high.

The features of the third and fourth embodiments may be combined to obtain the embodiment shown in fig. 3.

The features of the third embodiment and the fifth embodiment can be combined to obtain the embodiments shown in fig. 8 and 9.

The features of embodiment three and embodiment six may be combined to yield an embodiment as shown in fig. 12.

The features of the third embodiment and the seventh embodiment can be combined to obtain the embodiments shown in fig. 17 and 18.

The invention also discloses a steering system 1, as shown in fig. 43, the steering system 1 of the embodiment of the invention has the electric oil pump assembly 1000 described in any one of the embodiments, for example, oil output by the electric oil pump assembly 1000 can drive a transverse rod to displace through a piston push rod of a steering power cylinder to realize steering, so that the steering system 1 of the embodiment of the invention has the advantages of compact structure, good steering controllability and good working stability.

The invention further discloses a lubricating system 2, as shown in fig. 44, the lubricating system 2 of the embodiment of the invention is provided with the electric oil pump assembly 1000 described in any one of the embodiments, for example, the electric oil pump assembly 1000 can pump lubricating oil into a system needing lubrication, so that the lubricating system 2 of the embodiment of the invention has a compact structure and good working stability.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides an electric oil pump assembly which characterized in that, electric oil pump assembly has total oil inlet and total oil-out, and includes:

the motor assembly is provided with a liquid cooling cavity communicated with the main oil inlet, the liquid cooling cavity comprises a circulating oil duct, and the circulating oil duct is positioned between a stator of the motor assembly and a motor shell of the motor assembly;

the oil pump assembly is fixedly connected with the end part of the motor assembly and is in power coupling connection with a motor shaft of the motor assembly, an oil suction port of the oil pump assembly is communicated with the circulating oil duct, and an oil discharge port of the oil pump assembly is communicated with the total oil outlet;

the low-pressure cover covers the wall surface of the oil pump cavity and limits a low-pressure cavity communicated with the main oil inlet, and the low-pressure cover is connected with the front end cover of the motor assembly.

2. The electric oil pump assembly of claim 1, wherein the oil pump assembly is fixedly connected to the front end cover of the motor assembly by a threaded connection.

3. The electric oil pump assembly as set forth in claim 2, wherein the rim of the front cover plate of the oil pump assembly has a radially outwardly projecting lug, and the threaded connection extends through the lug and is threadedly connected to the front end cover.

4. The electric oil pump assembly of claim 2 wherein the threaded connection is a plurality of said threaded connections spaced apart circumferentially.

5. The electric oil pump assembly of claim 1, wherein the oil pump assembly is fixedly connected to a front end cover of the motor assembly, and the oil pump assembly and the front end cover are positioned by a positioning structure.

6. The electric oil pump assembly of claim 5, wherein the positioning structure is a positioning pin, and two ends of the positioning pin respectively extend into the positioning grooves on the front cover plate and the front end cover of the oil pump assembly.

7. The electric oil pump assembly of claim 5, wherein the positioning structure is a positioning boss protruding from the front end cover or from a front cover plate of the oil pump assembly.

8. The electric oil pump assembly of claim 1, wherein the oil pump assembly is fixedly connected to a front end cover of the motor assembly, and the oil pump assembly is installed in the oil pump cavity, and the oil pump cavity is filled with oil.

9. The electric oil pump assembly of claim 8 wherein said oil pump chamber is in communication with said main oil inlet, and said oil inlet is connected to said oil pump chamber.

10. The electric oil pump assembly of claim 9, wherein said front end cover is provided with an oil outlet passage, one end of said oil outlet passage is connected to an oil discharge port of said oil pump assembly, and the other end thereof forms said total oil outlet.

11. The electric oil pump assembly of claim 8, wherein the oil pump chamber is connected to an oil drain of the oil pump assembly and communicates with the main oil outlet.

12. The electric oil pump assembly of claim 11 wherein said front end cover defines an oil outlet passage, one end of said oil outlet passage being connected to said oil pump chamber and the other end defining said main oil outlet.

13. The electric oil pump assembly of claim 8 wherein the front end cap has an annular boss extending axially away from the motor assembly, the annular boss forming a side wall of the oil pump chamber, a top wall of the oil pump chamber being connected to the annular boss by a threaded fastener.

14. The electric oil pump assembly of claim 8, further comprising: and the sound-proof cover is covered outside the outer wall surface of the oil pump cavity.

15. The electric oil pump assembly of claim 1, wherein the low pressure cover has a tapered peripheral wall and an inner diameter of the low pressure cover tapers from proximate the main oil inlet to distal the main oil inlet.

16. The electric oil pump assembly of claim 8 wherein a seal ring is interposed between the oil pump assembly and the front end cover.

17. The electric oil pump assembly of claim 1 wherein the motor assembly and the oil pump assembly are transverse.

18. The electric oil pump assembly as set forth in any one of claims 1-17, wherein the electric motor assembly further comprises: the oil pump assembly is supported on the front end cover in a floating mode, the rear end cover seals the rear end of the motor shell to form a rear cavity of the liquid cooling cavity, the circulating oil ducts are multiple and are arranged at intervals along the circumferential direction, and the circulating oil ducts are communicated with the rear cavity.

19. The electric oil pump assembly according to claim 18, wherein the oil of at least one of the plurality of circulation oil passages flows from back to front and is connected to the oil suction port.

20. The electric oil pump assembly according to claim 19, wherein a part of the plurality of circulation oil passages is configured such that oil flows from the rear to the front, and another part of the plurality of circulation oil passages is configured such that oil flows from the front to the rear, and two types of circulation oil passages having different oil flow directions are arranged in a staggered manner in a circumferential direction.

21. The electric oil pump assembly of claim 18 wherein one of said plurality of said circulation galleries is connected to said main oil inlet such that oil flows into said hydraulic chamber through said one of said plurality of circulation galleries.

22. The electric oil pump assembly of claim 18 wherein an oil deflector is disposed between the stator and the front end cover.

23. The electric oil pump assembly according to claim 1, wherein the circulation oil passage extends in an axial direction.

24. The electric oil pump assembly as set forth in claim 1, wherein said oil pump assembly is floatingly supported on a front end cover of said motor assembly, said front end cover being provided with a through oil passage communicating said circulation oil passage with said oil suction port.

25. The electric oil pump assembly as set forth in claim 24, wherein the front end cover has a support flange projecting in an axial direction toward the rotor of the motor assembly for supporting the bearing of the motor assembly, the support flange, the motor shaft and the bearing of the motor assembly together defining an oil suction chamber connected to the oil suction port, and the oil passage extends through the support flange to communicate the oil suction chamber with the circulation oil passage.

26. The electric oil pump assembly according to any one of claims 1 to 17, wherein the oil gallery inlet is provided in a front end cover of the motor component and communicates with the circulation oil passage.

27. The electric oil pump assembly of claim 26 wherein the oil gallery inlet is disposed above the front end cover.

28. A steering system having an electric oil pump assembly as claimed in any one of claims 1 to 27.

29. A lubrication system having an electric oil pump assembly as claimed in any one of claims 1 to 27.