CN118040987A - Integrated oil-cooled motor and cooling method thereof - Google Patents

Abstract

The invention discloses an integrated oil-cooled motor and a cooling method thereof, wherein the motor comprises: the motor assembly is characterized by further comprising end cover assemblies and electric oil pump assemblies which are positioned at two ends of the motor assembly, and a heat exchange assembly which is positioned at the side part of the end cover assemblies; the heat exchange assembly comprises: the oil-water heat exchanger is in a circular design, and is internally provided with a plurality of oil cavities and water cavities which are formed by the separation of rib plates and are radially distributed, the plurality of oil cavities are mutually communicated, the plurality of water cavities are mutually communicated, and the oil cavities and the water cavities are arranged at intervals and exchange heat through the rib plates; the oil-water heat exchanger is provided with a plurality of oil inlet holes which are communicated with the oil cavity, and the bottom of the oil-water heat exchanger is provided with oil holes communicated with the oil cavity; the bottom and the top of the water cavity are respectively provided with water holes, the bottom is a water inlet, and the top is a water outlet; the oil outlet pipe of the heat exchanger is connected with the oil-water heat exchanger and is matched with the oil hole, and is used for guiding out cooled cooling oil; the water pipe joint is connected with the oil-water heat exchanger and is communicated with an external waterway in a matched manner with the water hole.

Description

Integrated oil-cooled motor and cooling method thereof

Technical Field

The invention relates to the field of oil-cooled motors, in particular to an integrated oil-cooled motor and a cooling method thereof.

Background

In the electric drive system for the vehicle, the motor is used as a main heating source and is required to be actively cooled.

With the improvement of the power density of the motor, the scheme of actively water-cooling the motor only through the stator water jacket cannot meet the heat dissipation requirement, and the oil-cooled motor becomes a mainstream technical scheme.

Existing oil-cooled motor systems in the market generally adopt split designs, all parts are provided with independent shells and are connected with each other through pipelines, most products are arranged on a gearbox/reducer through oil storage tanks, filter screens, electric oil pumps, oil-water heat exchangers and other products, and lubricating oil is led to a motor for cooling through pipelines.

The scheme has the advantages of low integration level, space waste, high cost, long cooling system path, large pressure loss, low efficiency, and more external connection points, and increases the risk of environment pollution caused by leakage of cooling medium;

It is therefore desirable to provide a highly integrated, efficient, economical, environmentally friendly oil-cooled motor solution to the above-mentioned problems.

Disclosure of Invention

The invention aims to: an integrated oil-cooled motor and a cooling method thereof are provided to solve the above problems in the prior art.

The technical scheme is as follows: an integrated oil-cooled motor and a cooling method thereof, comprising:

The motor assembly is characterized by further comprising end cover assemblies and electric oil pump assemblies which are positioned at two ends of the motor assembly, and a heat exchange assembly which is positioned at the side part of the end cover assemblies;

The heat exchange assembly comprises:

The oil-water heat exchanger is in a circular design, and is internally provided with a plurality of oil cavities and water cavities which are formed by the separation of rib plates and are radially distributed, the plurality of oil cavities are mutually communicated, the plurality of water cavities are mutually communicated, and the oil cavities and the water cavities are arranged at intervals and exchange heat through the rib plates;

The oil-water heat exchanger is provided with a plurality of oil inlet holes which are communicated with the oil cavity, and the bottom of the oil-water heat exchanger is provided with oil holes communicated with the oil cavity;

The bottom and the top of the water cavity are respectively provided with water holes, the bottom is a water inlet, and the top is a water outlet;

The oil outlet pipe of the heat exchanger is connected with the oil-water heat exchanger and is matched with the oil hole, and is used for guiding out cooled cooling oil;

the water pipe joint is connected with the oil-water heat exchanger and is communicated with an external waterway in a matched manner with the water hole;

The deep groove ball bearing I and the oil seal are arranged on the inner ring of the oil-water heat exchanger;

The oil-water heat exchanger inner ring is provided with an oil seal mounting structure for mounting an oil seal, and the oil seal mounting structure is of the prior art and can be selected according to a specific scheme.

And cooling oil is arranged in the oil cavity, and cooling water is arranged in the water cavity.

According to the invention, the heat exchange operation of cooling oil in the inner cavity of the motor is completed through designing the heat exchange component, the cooling path is short through integrated design and common shell arrangement, and the electric oil pump, the oil pump controller, the filter screen, the oil storage cavity and the oil-water heat exchanger are deeply integrated, so that the space utilization rate is greatly improved, the structural cost is reduced, the sealing reliability is improved, and the hydraulic loss is remarkably reduced through reasonable cooling path arrangement matched with an oil pump starting strategy.

In a further embodiment, the end cap assembly comprises:

the front end cover, and the oil outlet and the first radial oil hole which are arranged on the front end cover;

The oil outlet is arranged on the left end face of the top of the front end cover, and an oil supply joint matched with the oil outlet is arranged on the front end cover, so that cooling oil can be supplied to the external speed reducer/speed changer, and the oil outlet can be blocked when the external cooling oil is not needed.

The first radial oil hole is arranged at the top of the front end cover, is perpendicular to the oil supply joint and is arranged in a radial direction, and the front end cover is provided with an oil injection pipe I matched with the first radial oil hole and can supply oil to the oil injection pipe I;

the lower part of the front end cover is provided with an oil outlet and an oil return joint matched with the oil outlet; the oil chamber of the external transmission/reducer may be communicated with the motor-side oil chamber. When the outside does not need cooling oil, the oil hole can be plugged.

In a further embodiment, the left end face and the left overhanging cylindrical surface of the front end cover are provided with a first O-shaped ring and a second O-shaped ring;

Two O-shaped ring grooves are arranged on the left end face and the left overhanging cylindrical surface of the front end cover and are used for accommodating a first O-shaped ring and a second O-shaped ring;

The front end cover, the first O-shaped ring and the oil-water heat exchanger form a sealing structure to prevent the cooling oil from leaking to the outside.

The sealing structure formed by the front end cover, the second O-shaped ring and the oil-water heat exchanger prevents the pressure release caused by the leakage of cooling oil to the inner cavity.

An O-shaped ring III and an O-shaped ring IV are arranged on the right end face of the front end cover;

two O-shaped ring grooves are concentrically arranged on the right end face of the front end cover and are used for installing an O-shaped ring III and an O-shaped ring IV;

the front end cover, the O-shaped ring 3 and the main shell form a sealing structure to prevent the cooling oil from leaking to the outside.

The front end cover, the O-shaped ring 4 and the motor stator form a sealing structure to prevent the pressure release caused by the leakage of cooling oil to the inner cavity;

The first oil injection pipe is in a radial circular shape, and a plurality of tiny first oil injection holes are arranged on the inner ring; for spraying cooling oil to the motor stator.

In a further embodiment, the motor assembly comprises a motor shaft, two sets of balance end plates and a motor rotor which are assembled on the motor shaft in an interference manner, and a motor stator arranged on the outer ring of the motor rotor;

the motor rotor is positioned between the two groups of balance end plates, and the balance end plates are axially limited in a turning riveting mode at two ends of the motor shaft.

The right end of the motor shaft is provided with a rotary rotor in an interference fit manner, and the right end of the rotary rotor is limited by a pressing sleeve in the interference fit manner;

In a further embodiment, an axial oil inlet is arranged at the center of the motor shaft, a sealing ring groove is formed in the outer wall of the axial oil inlet, and a rotary sealing ring I is arranged in the sealing ring groove; and the first rotary sealing ring is matched with the oil pump end cover to form a seal, so that the pressure relief caused by leakage of cooling oil to the inner cavity is prevented.

The motor shaft is radially provided with a bearing lubrication hole and a main oil way oil outlet hole, and a pressure regulating valve and a throttling plug are arranged between the bearing lubrication hole and the axial oil inlet hole, so that the flow of cooling oil passing through the bearing lubrication hole can be accurately controlled.

Two ends of the oil outlet of the main oil way are provided with rotary sealing rings II; the rotary sealing ring 2 is matched with the front end cover to form a seal, so that the pressure relief caused by leakage of cooling oil to the inner cavity is prevented, and the rotary sealing ring II is arranged in sealing ring grooves arranged at two ends of an oil outlet of a main oil way.

An oil return hole is eccentrically arranged in the motor shaft, and cooling oil between the deep groove ball bearing I and the oil seal can be led to the right end of the motor shaft.

In a further embodiment, the electric oil pump assembly includes:

the oil pump comprises a main shell, an O-shaped ring five, a rotary stator and an oil pump end cover, wherein the O-shaped ring five, the rotary stator and the oil pump end cover are connected with the main shell;

The motor stator is connected with the main shell, the motor stator and the main shell form a sealing structure through five O-shaped rings, a radial cooling oil cavity is formed between the motor stator and the main shell, and the motor stator core part is subjected to immersed cooling;

The top of the main shell is provided with a second radial oil hole perpendicular to the radial cooling oil cavity, and is provided with a second oil injection pipe matched with the second radial oil hole, and the design of the second radial oil hole can supply oil to the second oil injection pipe;

The second oil spraying pipe is in a radial circular shape, and a plurality of tiny second oil spraying holes are arranged in the inner circle of the second oil spraying pipe and can spray cooling oil to the motor stator;

the rotary stator is arranged on the main shell through the spigot.

The main shell and the oil pump end cover are combined to form an inner cavity, and an outer oil pump rotor and an inner oil pump rotor are installed in the inner cavity.

In a further embodiment, a filter screen is arranged on the main shell, and an oil suction port of the filter screen is immersed in cooling oil and is communicated with the inner cavity of the motor;

an oil pumping cavity connected with an oil outlet of the filter screen is arranged on the main shell and is connected through an oil way arranged vertically;

the oil pumping oil cavity is formed by combining a main shell, an oil pump inner rotor and an oil pump outer rotor;

the oil pump end cover is provided with a bushing, and the bushing is used for carrying out auxiliary support on the oil pump motor rotor.

An oil pump oil outlet cavity and an oil way connected with the oil pump oil outlet cavity are arranged on the oil pump end cover, and cooling oil is introduced into an axial oil inlet hole of a motor shaft;

the oil pump oil outlet cavity is formed by combining an oil pump end cover with an oil pump inner rotor and an oil pump outer rotor;

In a further embodiment, an oil pump motor stator, an oil pump motor rotor and an oil pump motor controller are further arranged in the main shell, a rear end cover is arranged at the rear end of the main shell, and the front end is connected with the front end cover;

The main shell and the rear end cover are provided with deep groove ball bearings III;

the oil pump motor stator is fixedly arranged on the main shell;

two ends of the oil pump motor rotor are respectively supported on the main shell and the rear end cover through deep groove ball bearings III;

the inner rotor of the oil pump is arranged on the motor rotor of the oil pump, and is axially limited by the check rings at the two ends, and torque is transmitted through the keys.

The oil pump motor controller is installed on the main shell through a mounting structure and is connected with the rotary stator and the oil pump motor stator through wire harnesses.

The rear end cover is matched with the main shell to form an inner space for accommodating components such as an oil pump motor controller, an oil pump motor (an oil pump motor stator and an oil pump motor rotor), a filter screen, a wire harness and the like;

the main shell is matched with the front end cover to form an inner space for accommodating components such as a motor stator, a motor rotor, a rotary transformer (rotary transformer stator and rotary transformer), an oil pump (an oil pump inner rotor and an oil pump outer rotor) and the like.

In a further embodiment, the left end of the motor shaft is a spline, so that motor power can be output.

A deep groove ball bearing II is arranged on the motor shaft;

The left end of the motor shaft penetrates through the front end cover and is supported on the oil-water heat exchanger through the first deep groove ball bearing, when the motor shaft is assembled, the first deep groove ball bearing and the oil jacket are arranged on the motor shaft, and the motor shaft is also provided with an oil seal mounting structure for adapting to an oil seal, and the oil seal mounting structure is matched with the oil seal to form a sealing structure.

The right end of the motor shaft is supported on an oil pump end cover through a deep groove ball bearing II;

The front end cover is connected with the oil-water heat exchanger.

In a further embodiment, the oil pumping oil chamber and the axial oil inlet are communicated with each other;

the bearing lubrication hole and the main oil way oil outlet are communicated with the axial oil inlet hole;

The oil return hole is communicated with a cavity in which the deep groove ball bearing I is positioned, and an oil return channel which is communicated with the deep groove ball bearing II and is communicated with the oil return hole is arranged in the motor shaft;

An annular channel is arranged between the motor shaft and the front end cover and is used for communicating the deep groove ball bearing I with the bearing lubrication hole;

a preset space is reserved between the front end cover and the oil-water heat exchanger to form an oil storage cavity, and an oil outlet of a main oil way is communicated with the oil storage cavity;

the first radial oil hole, the second radial oil hole and the heat exchanger oil outlet pipe are communicated with the radial cooling oil cavity;

The front end cover, the main shell and the rear end cover are combined to form a motor inner cavity which is used for accommodating a motor assembly and serving as an oil pool for storing cooling oil;

and an oil suction port of the filter screen is communicated with the inner cavity of the motor.

A method of cooling an integrated oil-cooled motor, comprising:

Step 1, cooling oil in an inner cavity of a motor enters a filter screen through an oil suction port of the filter screen, passes through a plurality of layers of filter screens, then enters an oil pumping cavity of the oil pump through an oil outlet of the filter screen and an oil way vertically arranged on a main shell, pumps the cooling oil to an oil outlet cavity of the oil pump through the operation between an inner rotor and an outer rotor of the oil pump, and the cooling oil in the oil pumping cavity of the oil pump enters an axial oil inlet hole in a motor shaft through the oil way;

step 2, cooling oil entering an axial oil inlet hole in a motor shaft is split into two parts:

And (3) a step of: the small part of cooling oil upwards enters a bearing lubrication hole which is radially arranged through a throttle plug and a pressure regulating valve, enters a deep groove ball bearing I through an annular channel formed by a motor shaft and a front end cover to lubricate the deep groove ball bearing I, passes through the deep groove ball bearing I, enters a gap between the deep groove ball bearing I and an oil seal, enters a gap between the motor shaft and an oil pump end cover through an oil return hole and an oil return channel on the motor shaft, finally enters a deep groove ball bearing II to lubricate the deep groove ball bearing II, and returns to the inner cavity of the motor after passing through the deep groove ball bearing II;

and II: most of the cooling oil enters an oil storage cavity formed by the front end cover and the oil-water heat exchanger through a main oil way oil outlet hole on a motor shaft, enters an oil cavity of the oil-water heat exchanger through a plurality of oil inlet holes on the right end surface of the oil-water heat exchanger, and exchanges heat with low-temperature cooling water in a water cavity of the oil-water heat exchanger through a rib plate to cool; the cooled cooling oil enters a radial cooling oil cavity through an oil hole below the oil-water heat exchanger and an oil outlet pipe of the heat exchanger to submerge and cool the stator core part of the motor;

Step 3, entering the first oil spraying pipe and the second oil spraying pipe through the first radial oil hole and the second radial oil hole, spraying the first oil spraying pipe and the second oil spraying pipe to the stator coil part of the motor through a plurality of first oil spraying holes and a plurality of second oil spraying holes which are radially arranged on the first oil spraying pipe and the second oil spraying pipe, and cooling the coil part;

step 4, collecting part of cooling oil sprayed to the coil part by the front end cover, entering an annular area formed by the front end cover and the inside of the motor rotor, forming an evenly-distributed oil film by the centrifugal effect generated by the rotation of the motor rotor to cool the inner edge of the motor rotor core, and finally returning to the inner cavity of the motor through the left end part of the motor rotor;

Step 5, the water cavity of the oil-water heat exchanger is always filled with cooling water, and when heat exchange is needed, the circulating flow and the heat exchange are carried out under the driving of an external water pump and a cooling fan;

And 6, when the external transmission/reducer connected with the motor needs cooling oil for cooling and lubricating, the cooling oil in the radial cooling oil cavity enters the external transmission/reducer through the oil supply joint and finally returns to the inner cavity of the motor through the oil return joint.

The beneficial effects are that: the invention discloses an integrated oil cooling motor and a cooling method thereof, wherein the heat exchange work of cooling oil in the inner cavity of the motor is completed through designing a heat exchange component, the cooling path is short through integrated design and common shell arrangement, and an electric oil pump, an oil pump controller, a filter screen, an oil storage cavity and an oil-water heat exchanger are deeply integrated, so that the space utilization rate is greatly improved, the structural cost is reduced, the sealing reliability is improved, and the hydraulic loss is remarkably reduced through reasonable cooling path arrangement matched with an oil pump starting strategy.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of the specific structure of the present invention.

Fig. 3 is a schematic view of the heat exchange assembly and end cap assembly of the present invention.

Fig. 4 is a schematic view of the motor assembly of the present invention.

Fig. 5 is a schematic view of the electric oil pump assembly of the present invention.

Fig. 6 is a schematic diagram of the cooling oil flow path of the present invention.

The reference numerals are:

11. cooling water; 12. cooling oil;

2. a heat exchange assembly; 21. a water pipe joint; 22. an oil-water heat exchanger; 23. an oil seal; 24. a deep groove ball bearing I; 25. an oil outlet pipe of the heat exchanger;

3. An end cap assembly; 31. an oil supply joint; 32. an oil injection pipe I; 33. o-shaped ring I; 34. o-shaped ring II; 35. an oil return joint; 36. an O-shaped ring III; 37. an O-shaped ring IV; 38. a front end cover;

4. A motor assembly; 401. a motor stator; 402. a balance end plate; 403. a motor rotor; 404. a motor shaft; 405. a deep groove ball bearing II; 406. a rotor; 407. a pressure regulating valve; 408. a first rotary sealing ring; 409. a second rotary sealing ring; 410. throttling and blocking; 411. pressing the sleeve;

5. An electric oil pump assembly; 501. a main housing; 502. an O-shaped ring V; 503. a rotating stator; 504. an oil pump end cap; 505. a retainer ring; 506. a bushing; 507. a key; 508. an inner rotor of the oil pump; 509. an outer rotor of the oil pump; 510. a wave spring; 511. a filter screen; 512. a rear end cover; 513. an oil pump motor stator; 514. an oil pump motor rotor; 515. deep groove ball bearing III; 516. a wire harness; 517. an oil pump motor controller; 518. and a second oil injection pipe.

Detailed Description

The present application relates to an integrated oil-cooled motor and a cooling method thereof, and is explained in detail by means of specific embodiments.

An integrated oil-cooled motor comprising:

The motor assembly 4 is characterized by further comprising end cover assemblies 3 and electric oil pump assemblies 5 positioned at two ends of the motor assembly 4, and a heat exchange assembly 2 positioned at the side part of the end cover assemblies 3;

the heat exchange assembly 2 comprises:

The oil-water heat exchanger 22 is in a circular design, and is internally provided with a plurality of oil cavities and water cavities which are formed by the separation of rib plates and are radially distributed, the plurality of oil cavities are mutually communicated, the plurality of water cavities are mutually communicated, and the oil cavities and the water cavities are arranged at intervals and exchange heat through the rib plates;

The oil-water heat exchanger 22 is provided with a plurality of oil inlet holes which are communicated with the oil cavity, and the bottom of the oil heat exchanger is provided with an oil hole communicated with the oil cavity;

The bottom and the top of the water cavity are respectively provided with water holes, the bottom is a water inlet, and the top is a water outlet;

The heat exchanger oil outlet pipe 25 is connected with the oil-water heat exchanger 22 and matched with the oil hole, and is used for guiding out the cooled cooling oil 12;

the water pipe joint 21 is connected with the oil-water heat exchanger 22 and is communicated with an external waterway in a matched manner with the water hole;

The deep groove ball bearing I24 and the oil seal 23 are arranged on the inner ring of the oil-water heat exchanger 22;

The oil-water heat exchanger 22 inner circle is equipped with oil blanket 23 mounting structure for installation oil blanket 23, oil blanket 23 mounting structure is prior art, can select according to the concrete scheme.

The oil cavity is internally provided with cooling oil 12, and the water cavity is internally provided with cooling water 11.

According to the invention, the heat exchange work of the cooling oil 12 in the inner cavity of the motor is completed through the design of the heat exchange component 2, the cooling path is short through the integrated design and the arrangement of the common shell, and the electric oil pump, the oil pump controller, the filter screen 511, the oil storage cavity and the oil-water heat exchanger 22 are deeply integrated, so that the space utilization rate is greatly improved, the structural cost is reduced, the sealing reliability is improved, and the hydraulic loss is remarkably reduced through the reasonable arrangement of the cooling path and the oil pump starting strategy.

The end cap assembly 3 includes:

A front end cover 38, an oil outlet and a first radial oil hole which are arranged on the front end cover 38;

The oil outlet is arranged on the left end face of the top of the front end cover 38, the front end cover 38 is provided with an oil supply joint 31 matched with the oil outlet, the cooling oil 12 can be provided for the external speed reducer/speed changer, and when the cooling oil 12 is not needed outside, the oil outlet can be blocked.

The first radial oil hole is arranged at the top of the front end cover 38, is perpendicular to the oil supply joint 31 and is arranged in a radial direction, and the front end cover 38 is provided with an oil injection pipe I32 matched with the first radial oil hole, so that oil can be supplied to the oil injection pipe I32;

The lower part of the front end cover 38 is provided with an oil outlet hole and an oil return joint 35 matched with the oil outlet hole; the oil chamber of the external transmission/reducer may be communicated with the motor-side oil chamber. The oil hole may be plugged when the outside does not need to cool the oil 12.

The left end face and the left overhanging cylindrical surface of the front end cover 38 are provided with a first O-shaped ring 33 and a second O-shaped ring 34;

two O-shaped ring grooves are arranged on the left end face and the left overhanging cylindrical surface of the front end cover 38 and are used for accommodating the first O-shaped ring 33 and the second O-shaped ring 34;

the front end cover 38, the first O-ring 33 and the oil-water heat exchanger 22 form a sealing structure to prevent the cooling oil 12 from leaking to the outside.

The front end cover 38, the second O-ring 34 and the oil-water heat exchanger 22 form a sealing structure to prevent the cooling oil 12 from leaking into the inner cavity to cause pressure relief.

The right end face of the front end cover 38 is provided with an O-shaped ring III 36 and an O-shaped ring IV 37;

Two O-shaped ring grooves are concentrically arranged on the right end face of the front end cover 38 and are used for installing an O-shaped ring III 36 and an O-shaped ring IV 37;

the front end cover 38, the O-ring 3, and the main housing 501 constitute a sealing structure to prevent the cooling oil 12 from leaking to the outside.

The front end cover 38, the O-shaped ring 4 and the motor stator 401 form a sealing structure to prevent the pressure release caused by the leakage of the cooling oil 12 to the inner cavity;

the first oil spraying pipe 32 is in a radial circular shape, and a plurality of tiny first oil spraying holes are arranged on the inner ring; for spraying cooling oil 12 to the motor stator 401.

The motor assembly 4 comprises a motor shaft 404, two groups of balance end plates 402 and motor rotors 403 which are assembled on the motor shaft 404 in an interference manner, and a motor stator 401 arranged on the outer ring of the motor rotors 403;

the motor rotor 403 is located between the two sets of balance end plates 402, and performs axial limitation on the balance end plates 402 by means of flip riveting at two ends of the motor shaft 404.

The right end of the motor shaft 404 is provided with a rotary rotor 406 in an interference fit manner, and the right end of the rotary rotor 406 is limited by a press sleeve 411 in the interference fit manner;

an axial oil inlet hole is arranged in the center of the motor shaft 404, a sealing ring groove is formed in the outer wall of the axial oil inlet hole, and a rotary sealing ring I408 is arranged in the sealing ring groove; the first rotary seal ring 408 cooperates with the oil pump end cap 504 to form a seal that prevents the cooling oil 12 from leaking into the interior cavity and causing pressure relief.

The motor shaft 404 is radially provided with a bearing lubrication hole and a main oil way oil outlet hole, and a pressure regulating valve 407 and a throttling plug 410 are arranged between the bearing lubrication hole and the axial oil inlet hole, so that the flow of cooling oil 12 passing through the bearing lubrication hole can be accurately controlled.

Two ends of the oil outlet of the main oil way are provided with rotary sealing rings II 409; the rotary sealing ring 2 is matched with the front end cover 38 to form a seal, so that the pressure release caused by the leakage of the cooling oil 12 to the inner cavity is prevented, and the second rotary sealing ring 409 is arranged in sealing ring grooves arranged at two ends of an oil outlet of the main oil way.

An oil return hole is eccentrically arranged in the motor shaft 404, so that the cooling oil 12 between the deep groove ball bearing I24 and the oil seal 23 can be led to the right end of the motor shaft 404.

The electric oil pump assembly 5 includes:

a main housing 501, an O-ring five 502, a torque stator 503, and an oil pump end cap 504 connected to the main housing 501;

The motor stator 401 is connected with the main shell 501, the motor stator 401 and the main shell 501 form a sealing structure through an O-shaped ring five 502, a radial cooling oil 12 cavity is formed between the motor stator 401 and the main shell 501, and the iron core part of the motor stator 401 is subjected to immersed cooling;

The top of the main shell 501 is provided with a second radial oil hole perpendicular to the radial cooling oil 12 cavity, and is provided with a second oil injection pipe 518 matched with the second radial oil hole, and the second radial oil hole is designed to supply oil to the second oil injection pipe 518;

The second oil spraying pipe 518 is in a radial circular shape, and a plurality of tiny second oil spraying holes are arranged in the inner circle of the second oil spraying pipe and can spray cooling oil 12 to the motor stator 401;

the swirl stator 503 is mounted on the main housing 501 through a spigot.

The main housing 501 and the oil pump end cap 504 are combined to form an inner cavity, and an oil pump outer rotor 509 and an oil pump inner rotor 508 are installed in the inner cavity.

A filter screen 511 is mounted on the main housing 501, and an oil suction port of the filter screen 511 is immersed in the cooling oil 12;

an oil pumping cavity connected with an oil outlet of the filter screen 511 is arranged on the main shell 501 and is connected through an oil path arranged vertically;

The oil pumping cavity is composed of a main shell 501, an oil pump inner rotor 508 and an oil pump outer rotor 509;

the oil pump end cap 504 is provided with a bushing 506, and the bushing 506 supports the oil pump motor rotor 514 in an auxiliary manner.

An oil pump oil outlet cavity and an oil way connected with the oil pump oil outlet cavity are arranged on the oil pump end cover 504, and cooling oil 12 is introduced into an axial oil inlet hole of the motor shaft 404;

The oil pump oil outlet cavity is formed by combining an oil pump end cover 504 with an oil pump inner rotor 508 and an oil pump outer rotor 509;

a wave spring 510 is arranged between the oil pump end cover 504 and the second deep groove ball bearing 405 and is used for pre-tightening the first deep groove ball bearing 24 and the second deep groove ball bearing 405.

The main housing 501 is further provided with an oil pump motor stator 513, an oil pump motor rotor 514 and an oil pump motor controller 517, the rear end of the main housing 501 is provided with a rear end cover 512, and the front end is connected with the front end cover 38;

The main housing 501 and the rear end cap 512 are provided with a third deep groove ball bearing 515;

The oil pump motor stator 513 is fixedly mounted on the main housing 501;

Two ends of the oil pump motor rotor 514 are respectively supported on the main shell 501 and the rear end cover 512 through deep groove ball bearings III 515;

the inner rotor 508 of the oil pump is arranged on the rotor 514 of the oil pump motor, and is axially limited by the check rings 505 at the two ends, and torque is transmitted by the keys 507.

The oil pump motor controller 517 is mounted on the main housing 501 by a mounting structure, and is connected to the swirl stator 503 and the oil pump motor stator 513 by a wire harness 516.

The rear end cover 512 cooperates with the main housing 501 to form an inner space for accommodating components such as an oil pump motor controller 517, an oil pump motor (an oil pump motor stator 513, an oil pump motor rotor 514), a filter screen 511, a wire harness 516, and the like;

The main housing 501 cooperates with the front cover 38 to form an internal space for accommodating the motor stator 401, the motor rotor 403, the rotary transformer (the rotary transformer 503, the rotary transformer 406), the oil pump (the oil pump inner rotor 508, the oil pump outer rotor 509) and the like.

The left end of the motor shaft 404 is provided with a spline 507, so that motor power can be output.

A second deep groove ball bearing 405 is arranged on the motor shaft 404;

The left end of the motor shaft 404 passes through the front end cover 38 and is supported on the oil-water heat exchanger 22 through the first deep groove ball bearing 24, and when in assembly, the first deep groove ball bearing 24 and the oil seal 23 are sleeved on the motor shaft 404, and the motor shaft 404 is also provided with an oil seal 23 mounting structure for adapting to the oil seal 23, and a sealing structure is formed by the cooperation of the oil seal 23 mounting structure and the oil seal 23.

The right end of the motor shaft 404 is supported on the oil pump end cover 504 through a second deep groove ball bearing 405;

The front end cover 38 is connected to the oil-water heat exchanger 22.

The oil pumping oil cavity, the oil pumping oil cavity and the axial oil inlet hole are communicated with each other;

the bearing lubrication hole and the main oil way oil outlet are communicated with the axial oil inlet hole;

The oil return hole is communicated with a cavity where the first deep groove ball bearing 24 is located, and an oil return channel which is communicated with the second deep groove ball bearing 405 and is communicated with the oil return hole is arranged in the motor shaft 404;

an annular channel is arranged between the motor shaft 404 and the front end cover 38 and is used for communicating the deep groove ball bearing I24 with a bearing lubrication hole;

A predetermined space is reserved between the front end cover 38 and the oil-water heat exchanger 22 to form an oil storage cavity, and an oil outlet hole of a main oil way is communicated with the oil storage cavity;

the first radial oil hole, the second radial oil hole and the heat exchanger oil outlet pipe 25 are communicated with the radial cooling oil 12 cavity;

the front end cover 38, the main housing 501 and the rear end cover 512 combine to form a motor cavity for accommodating the motor assembly 4 and serving as an oil pool for storing cooling oil;

the oil suction port of the filter screen 511 is communicated with the inner cavity of the motor.

A method of cooling an integrated oil-cooled motor, comprising:

Step 1, cooling oil 12 in an inner cavity of a motor enters a filter screen 511 through an oil suction port of the filter screen 511, passes through an oil outlet of the filter screen 511 and an oil way vertically arranged on a main shell 501 after passing through a plurality of layers of filter screens 511, enters an oil pumping oil cavity of the oil pump, pumps the cooling oil 12 to an oil outlet cavity of the oil pump through the operation between an inner rotor and an outer rotor of the oil pump, and the cooling oil 12 in the oil pumping oil cavity enters an axial oil inlet hole in a motor shaft 404 through the oil way;

Step2, the cooling oil 12 entering the axial oil inlet hole in the motor shaft 404 is split into two parts:

And (3) a step of: the small part of cooling oil 12 upwards enters a bearing lubrication hole which is radially arranged through a throttle plug 410 and a pressure regulating valve 407, enters a first deep groove ball bearing 24 through an annular channel formed by a motor shaft 404 and a front end cover 38 to lubricate the first deep groove ball bearing 24, passes through the first deep groove ball bearing 24, enters a gap between the first deep groove ball bearing 24 and an oil seal 23, enters a gap between the motor shaft 404 and an oil pump end cover 504 through an oil return hole and an oil return channel on the motor shaft 404, finally enters a second deep groove ball bearing 405 to lubricate the second deep groove ball bearing 405, and returns to the inner cavity of the motor after passing through the second deep groove ball bearing 405;

And II: most of the cooling oil 12 enters an oil storage cavity formed by the front end cover 38 and the oil-water heat exchanger 22 through a main oil way oil outlet hole on the motor shaft 404, enters an oil cavity of the oil-water heat exchanger 22 through a plurality of oil inlet holes on the right end surface of the oil-water heat exchanger 22, and exchanges heat with low-temperature cooling water 11 in a water cavity of the oil-water heat exchanger 22 through a rib plate; the cooled cooling oil 12 enters a radial cooling oil 12 cavity through an oil hole below the oil-water heat exchanger 22 and an oil outlet pipe 25 of the heat exchanger to submerge and cool the iron core part of the motor stator 401;

Step 3, entering the first oil spraying pipe 32 and the second oil spraying pipe 518 through the first radial oil hole and the second radial oil hole, spraying the first oil spraying pipe 32 and the second oil spraying pipe 518 with a plurality of first oil spraying holes and second oil spraying holes arranged radially to the coil part of the motor stator 401, and cooling the coil part;

Step 4, collecting part of the cooling oil 12 sprayed to the coil part by the front end cover 38, entering an annular area formed by the front end cover 38 and the inside of the motor rotor 403, forming an evenly-distributed oil film by the centrifugal effect generated by the rotation of the motor rotor 403 to cool the inner edge of the iron core of the motor rotor 403, and finally returning to the inner cavity of the motor through the left end part of the motor rotor 403;

step 5, the water cavity of the oil-water heat exchanger 22 is always filled with cooling water 11, and when heat exchange is needed, the circulating flow and the heat exchange are carried out under the drive of an external water pump and a cooling fan;

Step 6, when the external transmission/reducer connected with the motor needs the motor cooling oil 12 for cooling and lubrication, the cooling oil 12 in the cavity of the radial cooling oil 12 enters the external transmission/reducer through the oil supply joint 31 and finally returns to the inner cavity of the motor through the oil return joint 35.

Description of working principle: cooling oil 12 in the inner cavity of the motor enters the filter screen 511 through an oil suction port of the filter screen 511, passes through the multiple layers of filter screens 511, then enters an oil pumping oil cavity through an oil outlet of the filter screen 511 and an oil way vertically arranged on the main shell 501, pumps the cooling oil 12 to an oil outlet cavity of the oil pump through the operation between the inner rotor and the outer rotor of the oil pump, and the cooling oil 12 in the oil pumping oil cavity enters an axial oil inlet hole in the motor shaft 404 through the oil way;

the cooling oil 12 entering the axial oil inlet in the motor shaft 404 is split into two parts:

And (3) a step of: the small part of cooling oil 12 upwards enters a bearing lubrication hole which is radially arranged through a throttle plug 410 and a pressure regulating valve 407, enters a first deep groove ball bearing 24 through an annular channel formed by a motor shaft 404 and a front end cover 38 to lubricate the first deep groove ball bearing 24, passes through the first deep groove ball bearing 24, enters a gap between the first deep groove ball bearing 24 and an oil seal 23, enters a gap between the motor shaft 404 and an oil pump end cover 504 through an oil return hole and an oil return channel on the motor shaft 404, finally enters a second deep groove ball bearing 405 to lubricate the second deep groove ball bearing 405, and returns to the inner cavity of the motor after passing through the second deep groove ball bearing 405;

And II: most of the cooling oil 12 enters an oil storage cavity formed by the front end cover 38 and the oil-water heat exchanger 22 through a main oil way oil outlet hole on the motor shaft 404, enters an oil cavity of the oil-water heat exchanger 22 through a plurality of oil inlet holes on the right end surface of the oil-water heat exchanger 22, and exchanges heat with low-temperature cooling water 11 in a water cavity of the oil-water heat exchanger 22 through a rib plate; the cooled cooling oil 12 enters a radial cooling oil 12 cavity through an oil hole below the oil-water heat exchanger 22 and an oil outlet pipe 25 of the heat exchanger to submerge and cool the iron core part of the motor stator 401;

Then the oil enters the oil injection pipe I32 and the oil injection pipe II 518 through the first radial oil hole and the second radial oil hole, and is sprayed to the coil part of the motor stator 401 through a plurality of first oil injection holes and second oil injection holes which are radially arranged on the oil injection pipe I32 and the oil injection pipe II 518, so as to cool the coil part;

Part of the cooling oil 12 sprayed to the coil part is collected by the front end cover 38 and enters an annular area formed by the front end cover 38 and the inside of the motor rotor 403, the centrifugal effect generated by the rotation of the motor rotor 403 forms an evenly distributed oil film for cooling the inner edge of the iron core of the motor rotor 403, and finally, the cooling oil returns to the inner cavity of the motor through the left end part of the motor rotor 403;

The water cavity of the oil-water heat exchanger 22 is always filled with cooling water 11, and when heat exchange is needed, the water is driven by an external water pump and a cooling fan to circularly flow and exchange heat;

when the external transmission/reducer connected with the motor needs the motor cooling oil 12 for cooling lubrication, the cooling oil 12 in the cavity of the radial cooling oil 12 enters the external transmission/reducer through the oil supply joint 31 and finally returns to the inner cavity of the motor through the oil return joint 35.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the embodiments, and various equivalent changes can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and all such equivalent changes belong to the protection scope of the present invention.

Claims (10)

1. An integrated oil-cooled motor comprising:

The motor assembly (4) is characterized by further comprising end cover assemblies (3) and electric oil pump assemblies (5) which are positioned at two ends of the motor assembly (4), and a heat exchange assembly (2) which is positioned at the side part of the end cover assemblies (3);

the heat exchange assembly (2) comprises:

The oil-water heat exchanger (22) is in a circular design, a plurality of oil cavities and water cavities which are formed by rib plates in an isolated mode and distributed radially are formed in the oil-water heat exchanger, the oil cavities are mutually communicated, the water cavities are mutually communicated, and the oil cavities and the water cavities are arranged at intervals and exchange heat through the rib plates;

the oil-water heat exchanger (22) is provided with a plurality of oil inlet holes which are communicated with the oil cavity, and the bottom of the oil heat exchanger is provided with an oil hole communicated with the oil cavity;

The bottom and the top of the water cavity are respectively provided with water holes, the bottom is a water inlet, and the top is a water outlet;

the heat exchanger oil outlet pipe (25) is connected with the oil-water heat exchanger (22) and is matched with the oil hole;

the water pipe joint (21) is connected with the oil-water heat exchanger (22) and is communicated with an external waterway in a matched manner with the water hole.

2. An integrated oil-cooled motor as recited in claim 1, wherein: the end cap assembly (3) comprises:

a front end cover (38), an oil outlet and a first radial oil hole which are arranged on the front end cover (38);

the oil outlet is arranged on the left end face of the top of the front end cover (38), and the front end cover (38) is provided with an oil supply joint (31) matched with the oil outlet;

the first radial oil hole is arranged at the top of the front end cover (38), is perpendicular to the oil supply joint (31) and is arranged in the radial direction, and the front end cover (38) is provided with an oil injection pipe I (32) matched with the first radial oil hole;

The lower part of the front end cover (38) is provided with an oil outlet and an oil return joint (35) matched with the oil outlet;

the first oil injection pipe (32) is in a radial annular shape, and a plurality of tiny first oil injection holes are arranged on the inner ring.

3. An integrated oil-cooled motor as recited in claim 1, wherein: the motor assembly (4) comprises a motor shaft (404), two groups of balance end plates (402) and motor rotors (403) which are assembled on the motor shaft (404) in an interference mode, and motor stators (401) arranged on outer rings of the motor rotors (403).

4. An integrated oil cooled motor according to claim 3, wherein: an axial oil inlet hole is arranged in the center of the motor shaft (404), a sealing ring groove is formed in the outer wall of the axial oil inlet hole, and a rotary sealing ring I (408) is arranged in the sealing ring groove;

a bearing lubrication hole and a main oil way oil outlet hole are radially arranged on the motor shaft (404), and a pressure regulating valve (407) and a throttling plug (410) are arranged between the bearing lubrication hole and the axial oil inlet hole;

two ends of the oil outlet of the main oil way are provided with rotary sealing rings II (409);

an oil return hole is eccentrically arranged in the motor shaft (404).

5. An integrated oil-cooled motor as recited in claim 1, wherein: the electric oil pump assembly (5) includes:

a main housing (501), and an oil pump end cap (504) connected to the main housing (501);

The motor stator (401) is connected with the main shell (501), and a radial cooling oil (12) cavity is formed between the motor stator (401) and the main shell (501);

A second radial oil hole perpendicular to the radial cooling oil (12) cavity is arranged at the top of the main shell (501), and a second oil injection pipe (518) matched with the second radial oil hole is arranged;

The oil spraying pipe II (518) is in a radial circular shape, and a plurality of tiny second oil spraying holes are arranged in the inner circle of the oil spraying pipe II and can spray cooling oil (12) to the motor stator (401);

The main shell (501) and the oil pump end cover (504) are combined to form an inner cavity, and an outer oil pump rotor (509) and an inner oil pump rotor (508) are arranged in the inner cavity.

6. An integrated oil cooled motor as recited in claim 5, wherein: a filter screen (511) is arranged on the main shell (501);

an oil pump oil suction cavity connected with an oil outlet of the filter screen (511) is arranged on the main shell (501);

a bushing (506) is arranged on the oil pump end cover (504);

an oil pump oil outlet cavity is arranged on the oil pump end cover (504), and cooling oil (12) is introduced into an axial oil inlet hole of the motor shaft (404).

7. An integrated oil cooled motor as recited in claim 5, wherein: an oil pump motor stator (513), an oil pump motor rotor (514) and an oil pump motor controller (517) are further arranged in the main shell (501), a rear end cover (512) is arranged at the rear end of the main shell (501), and the front end is connected with a front end cover (38);

A deep groove ball bearing III (515) is arranged on the main shell (501) and the rear end cover (512);

an oil pump motor stator (513) is fixedly mounted on the main housing (501);

Two ends of an oil pump motor rotor (514) are respectively supported on the main shell (501) and the rear end cover (512) through deep groove ball bearings III (515);

The oil pump motor controller (517) is mounted on the main housing (501) by a mounting structure, and is connected with the swirl stator (503) and the oil pump motor stator (513) by a wire harness (516).

8. The integrated oil-cooled motor of claim 4, wherein: a deep groove ball bearing II (405) is arranged on the motor shaft (404);

the left end of the motor shaft (404) passes through the front end cover (38) and is supported on the oil-water heat exchanger (22) through a first deep groove ball bearing (24), and when the motor shaft is assembled, the first deep groove ball bearing (24) and the oil seal (23) are sleeved on the motor shaft (404);

The right end of a motor shaft (404) is supported on an oil pump end cover (504) through a second deep groove ball bearing (405);

the front end cover (38) is connected with the oil-water heat exchanger (22).

9. An integrated oil-cooled motor as recited in claim 1, wherein: the oil pumping oil cavity, the oil pumping oil cavity and the axial oil inlet hole are communicated with each other;

the bearing lubrication hole and the main oil way oil outlet are communicated with the axial oil inlet hole;

The oil return hole is communicated with a cavity in which the first deep groove ball bearing (24) is arranged, and an oil return channel which is communicated with the second deep groove ball bearing (405) and is communicated with the oil return hole is arranged in the motor shaft (404);

an annular channel is arranged between the motor shaft (404) and the front end cover (38), and is used for communicating the deep groove ball bearing I (24) with a bearing lubrication hole;

A preset space is reserved between the front end cover (38) and the oil-water heat exchanger (22) to form an oil storage cavity, and an oil outlet hole of a main oil way is communicated with the oil storage cavity;

the first radial oil hole, the second radial oil hole and the heat exchanger oil outlet pipe (25) are communicated with a radial cooling oil (12) cavity;

The front end cover (38), the main shell (501) and the rear end cover (512) are combined to form a motor inner cavity;

An oil suction port of the filter screen (511) is communicated with the inner cavity of the motor.

10. A method of cooling an integrated oil-cooled motor, comprising:

Step 1, cooling oil (12) in an inner cavity of a motor enters a filter screen (511) through an oil suction port of the filter screen (511), passes through an oil outlet of the filter screen (511) and an oil way vertically arranged on a main shell (501) after passing through a plurality of layers of filter screens (511), enters an oil pumping oil cavity of the oil pump, pumps the cooling oil (12) to an oil outlet cavity of the oil pump through the operation between an inner rotor and an outer rotor of the oil pump, and the cooling oil (12) in the oil pumping oil cavity of the oil pump enters an axial oil inlet hole in a motor shaft (404) through the oil way;

Step 2, cooling oil (12) entering an axial oil inlet hole in a motor shaft (404) is split into two parts:

And (3) a step of: the small part of cooling oil (12) upwards enters a bearing lubrication hole which is radially arranged through a throttle plug (410) and a pressure regulating valve (407), enters a deep groove ball bearing I (24) through an annular channel formed by a motor shaft (404) and a front end cover (38), lubricates the deep groove ball bearing I (24), passes through the deep groove ball bearing I (24), enters a gap between the deep groove ball bearing I (24) and an oil seal (23), enters a gap between the motor shaft (404) and an oil pump end cover (504) through an oil return hole and an oil return channel on the motor shaft (404), finally enters a deep groove ball bearing II (405), lubricates the deep groove ball bearing II (405), and returns to the motor cavity after passing through the deep groove ball bearing II (405);

and II: most of the cooling oil (12) enters an oil storage cavity formed by the front end cover (38) and the oil-water heat exchanger (22) through a main oil way oil outlet on a motor shaft (404), enters an oil cavity of the oil-water heat exchanger (22) through a plurality of oil inlet holes on the right end surface of the oil-water heat exchanger (22), and exchanges heat with low-temperature cooling water (11) in a water cavity of the oil-water heat exchanger (22) through a rib plate; the cooled cooling oil (12) enters a radial cooling oil (12) cavity through an oil hole below an oil-water heat exchanger (22) and an oil outlet pipe (25) of the heat exchanger to submerge and cool the iron core part of the motor stator (401);

Step 3, entering an oil injection pipe I (32) and an oil injection pipe II (518) through a first radial oil hole and a second radial oil hole, spraying a plurality of first oil injection holes and second oil injection holes which are radially arranged on the oil injection pipe I (32) and the oil injection pipe II (518) to a coil part of a motor stator (401), and cooling the coil part;

Step 4, collecting part of cooling oil (12) sprayed to the coil part by the front end cover (38) and entering an annular area formed by the front end cover (38) and the inside of the motor rotor (403), forming an evenly distributed oil film by the centrifugal effect generated by the rotation of the motor rotor (403) to cool the inner edge of the iron core of the motor rotor (403), and finally returning to the inner cavity of the motor through the left end part of the motor rotor (403);

Step 5, the water cavity of the oil-water heat exchanger (22) is always filled with cooling water (11), and when heat exchange is needed, the water cavity is driven by an external water pump and a cooling fan to circularly flow and exchange heat;

And 6, when the external transmission/speed reducer connected with the motor needs cooling and lubrication of the motor cooling oil (12), the cooling oil (12) in the radial cooling oil (12) cavity enters the external transmission/speed reducer through an oil supply joint (31) and finally returns to the inner cavity of the motor through an oil return joint (35).