CN117674507A - Motor cooling device, electric driving device, vehicle and oil-water cooling method - Google Patents

Abstract

The application provides a motor cooling device, an electric driving device, a vehicle and an oil-water cooling method, wherein the motor cooling device comprises a motor main body, a water-oil heat exchanger and a motor stator, and the water-oil heat exchanger is connected to the motor main body; the motor main body comprises a motor shell and a motor water jacket, and a motor water channel is arranged between the motor shell and the motor water jacket; the motor shell is provided with an oil storage cavity, the motor water jacket is provided with a containing cavity and a water jacket oil duct, the motor stator is arranged in the containing cavity, and the motor stator is provided with a stator winding; the oil storage cavity and the water jacket oil duct are respectively communicated with the accommodating cavity; the water-oil heat exchanger is provided with an exchanger water channel and an exchanger oil channel, the motor water channel is communicated with the exchanger water channel, the oil storage cavity is connected with the exchanger oil channel through an oil pump, and the exchanger oil channel is communicated with the water jacket oil channel. The cooling water in the motor cooling device cools the cooling oil through the water-oil heat exchanger. The cooling oil enters the accommodating cavity to be in direct contact with the motor stator, and absorbs heat. So the radiating effect to the motor stator is better.

Description

Motor cooling device, electric driving device, vehicle and oil-water cooling method

Technical Field

The application relates to the technical field of vehicle equipment, in particular to an electric driving device, a motor cooling device, a vehicle and an oil-water cooling method.

Background

Electric drive devices are an important component in current electric vehicles. When the electric drive device works, current flows through the electric drive device, so that the stator iron core and the stator winding are seriously heated. In order to increase the drive power and the operational reliability of the electric drive, it is necessary to cool it.

The existing electric driving equipment is cooled by adopting a water cooling mode, and cooling water flows in the motor water jacket so as to absorb heat emitted by the motor water jacket and the motor stator. However, the mode can only absorb heat through the contact of cooling water and a motor water jacket, and has poor heat dissipation effect on a motor stator, particularly a stator winding.

In view of this, improvements are needed.

Disclosure of Invention

The purpose of the application is to provide an electric drive device, a motor cooling device, a vehicle and an oil-water cooling method with better cooling effect.

The motor cooling device comprises a motor main body and a water-oil heat exchanger, wherein the water-oil heat exchanger is connected to the motor main body; the motor main body comprises a motor shell, a motor stator and a motor water jacket arranged in the motor shell, and a motor water channel is arranged between the motor shell and the motor water jacket; the motor shell is provided with an oil storage cavity, the motor water jacket is provided with an accommodating cavity and a water jacket oil duct, the motor stator is arranged in the accommodating cavity, and the motor stator is provided with a stator winding; the oil storage cavity and the water jacket oil duct are respectively communicated with the accommodating cavity; the water-oil heat exchanger is provided with an exchanger water channel and an exchanger oil channel, the motor water channel is communicated with the exchanger water channel, the oil storage cavity is connected with the exchanger oil channel through an oil pump, and the exchanger oil channel is communicated with the water jacket oil channel.

Further, the motor main body is connected with a motor controller, an electric control water channel is arranged in the motor controller, and the electric control water channel is connected with the motor water channel through a sealing pipe.

Further, a first oil duct communicated with the motor exchanger oil duct and a second oil duct communicated with the water jacket oil duct are arranged on the motor shell; the motor is characterized in that a connecting cover plate is arranged on the motor shell, a cover plate oil duct is arranged in the connecting cover plate, one end of the cover plate oil duct is communicated with the first oil duct, and the other end of the cover plate oil duct is communicated with the second oil duct.

Further, a water jacket oil hole is formed in the motor water jacket, and the water jacket oil duct is communicated with the accommodating cavity through the water jacket oil hole; the motor stator is provided with an oil guide disc for guiding oil for the stator winding, and the oil guide disc is positioned between the stator winding and the water jacket oil hole.

Further, the motor stator comprises a stator rotating shaft rotatable in the accommodating cavity, and the stator rotating shaft is provided with a rotating shaft oil duct and a rotating shaft oil hole; the exchanger oil duct is communicated with the rotating shaft oil duct, and the rotating shaft oil duct is communicated with the accommodating cavity through the rotating shaft oil hole.

Further, a balancing plate is arranged on the stator rotating shaft, an oil outlet with an opening facing the stator winding is arranged in the balancing plate, and the oil outlet is communicated with the rotating shaft oil hole.

Further, a coarse filter and a fine filter are arranged on the motor main body, the coarse filter is connected between the oil storage cavity and the oil pump, and the fine filter is connected between the oil pump and the water-oil heat exchanger.

Further, a speed reducer is arranged on the motor main body, and the speed reducer is provided with a speed reducer shell and a speed reducing bearing arranged in the speed reducer shell; the speed reducer shell is provided with a connecting oil duct with an opening facing the speed reducer bearing, and the connecting oil duct is communicated with the exchanger oil duct.

The technical scheme of the application provides an electric drive device, which comprises the motor cooling device.

The technical scheme of the application provides a vehicle, including foretell motor cooling device.

The technical proposal of the application provides an oil-water cooling method, which comprises a cooling step of adopting the motor cooling device of any one of the above steps for cooling, wherein the cooling step is as follows,

cooling water enters the motor water channel from the outside of the motor shell and then flows into the exchanger water channel of the water-oil heat exchanger; the oil pump pumps cooling oil out of the oil storage cavity and conveys the cooling oil into the oil passage of the exchanger of the water-oil heat exchanger; after the cooling oil in the exchanger oil duct exchanges heat with the cooling water in the exchanger water channel, the cooling oil enters the accommodating cavity through the water jacket oil duct to cool the motor stator; the cooling oil in the accommodating cavity flows back into the oil storage cavity after the motor stator is cooled down.

Further, a filtering step is included; the cooling oil flowing out of the oil storage cavity is filtered by a coarse filter and then enters the oil pump; the cooling oil flowing out from the oil pump is filtered by a fine filter and then enters the exchanger oil passage.

Further, the method comprises the step of cooling the speed reducer and the differential; and part of the cooling oil flowing out of the exchanger oil duct enters a speed reducer shell of the speed reducer through a connecting oil duct on the speed reducer to cool a speed reducer bearing of the speed reducer.

By adopting the technical scheme, the method has the following beneficial effects:

in the motor cooling device, cooling water enters a motor water channel to cool a motor water jacket, and the cooling water also absorbs heat of cooling oil through a water-oil heat exchanger. And then the cooling oil enters the accommodating cavity to be in direct contact with the motor stator, and heat is absorbed. So through the mode that water-cooling and oil cooling combine, improved the cooling effect, cooling oil and motor stator direct contact moreover can improve the cooling efficiency to motor stator. The motor cooling device has better vehicle quality and is not easy to fail.

Drawings

FIG. 1 is a schematic diagram of a motor cooling apparatus according to an embodiment of the present application;

FIG. 2 is another schematic diagram of a motor cooling apparatus according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present application;

FIG. 4 is a schematic illustration of a motor housing and motor water jacket weld in an embodiment of the present application;

FIG. 5 is a schematic illustration of another angular weld of a motor housing and a motor water jacket in an embodiment of the present application;

FIG. 6 is a schematic illustration of an exploded motor housing and motor water jacket in an embodiment of the present application;

FIG. 7 is a schematic view of an alternative angle of the motor housing and motor water jacket exploded in accordance with an embodiment of the present disclosure;

FIG. 8 is a schematic view of a motor water channel and a receiving chamber in an embodiment of the present application;

FIG. 9 is a schematic illustration of a motor housing and a coarse filter according to an embodiment of the present application;

FIG. 10 is a schematic view of a motor housing, an oil pump, and a fine filter according to an embodiment of the present application;

FIG. 11 is a schematic illustration of a motor housing and a water-to-oil heat exchanger in an embodiment of the present application;

FIG. 12 is a schematic illustration of connecting an oil cover and a water jacket gallery in an embodiment of the present application;

FIG. 13 is a schematic view of a first oil passage, a second oil passage, a connecting oil cover and a water jacket oil passage according to an embodiment of the present application;

FIG. 14 is a schematic view of a water jacket oil hole, a receiving cavity and a motor water channel in an embodiment of the present application;

FIG. 15 is a schematic view of a third oil passage and a shaft oil passage according to an embodiment of the present disclosure;

FIG. 16 is a schematic cross-sectional view of a motor housing, a motor water jacket, and a motor stator in an embodiment of the present application;

FIG. 17 is a schematic view of a water-to-oil heat exchanger according to an embodiment of the present application;

FIG. 18 is a flow path diagram of cooling water and cooling oil in an embodiment of the present application;

FIG. 19 is a schematic diagram of a method of cooling oil water in an embodiment of the present application.

Detailed Description

Specific embodiments of the present application are further described below with reference to the accompanying drawings.

It is easy to understand that, according to the technical solution of the present application, those skilled in the art may replace various structural manners and implementation manners without changing the true spirit of the present application. Accordingly, the following detailed description and drawings are merely illustrative of the present application and are not intended to be exhaustive or to be limiting of the application.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.

Fig. 1-3, 6-7, 10-11 and fig. 16-17 show a motor cooling device 10 according to an embodiment of the present application, which includes a motor body 1 and a water-oil heat exchanger 2, wherein the water-oil heat exchanger 2 is connected to the motor body 1.

The motor body 1 includes a motor housing 11, a motor stator 12, and a motor water jacket 13 provided in the motor housing 11, and a motor water channel 14 is provided between the motor housing 11 and the motor water jacket 13.

The motor housing 11 is provided with an oil storage cavity 111, the motor water jacket 13 is provided with a containing cavity 131 and a water jacket oil duct 132, the motor stator 12 is arranged in the containing cavity 131, and the motor stator 12 is provided with a stator winding 121.

The oil reservoir chamber 111 and the water jacket oil passage 132 are respectively communicated with the accommodation chamber 131.

The water-oil heat exchanger 2 has an exchanger water passage 21 and an exchanger oil passage 22, the motor water passage 14 communicates with the exchanger water passage 21, the oil reservoir 111 is connected to the exchanger oil passage 22 through the oil pump 3, and the exchanger oil passage 22 communicates with the water jacket oil passage 132.

The motor cooling device 10 is part of a drive assembly on an electric vehicle, and includes a motor main body 1 and a water-oil heat exchanger 2. The motor body 1 has a motor housing 11, a motor water jacket 13, and a motor stator 12. The motor housing 11 has a mounting cavity 112, the motor water jacket 13 is mounted in the mounting cavity 112, and a motor water channel 14 is formed between the motor water jacket 13 and an inner wall of the mounting cavity 112. The motor shell 11 is provided with a motor water inlet and a motor water outlet which are communicated with the motor water channel 14. The motor water jacket 13 has a housing cavity 131, and the motor stator 12 is mounted in the housing cavity 131, the motor stator 12 having stator windings 121. The motor water jacket 13 is provided with a water jacket oil passage 132, and the water jacket oil passage 132 communicates with the accommodation chamber 131. An oil storage cavity 111 is further formed in the motor shell 11, a water jacket oil outlet is formed in the motor water jacket 13, and the oil storage cavity 111 is communicated with the accommodating cavity 131 through the water jacket oil outlet.

The water-oil heat exchanger 2 has an exchanger water passage 21 and an exchanger oil passage 22, and the liquid flowing through the exchanger water passage 21 can exchange heat with the liquid flowing through the exchanger oil passage 22. Wherein the exchanger water channel 21 is communicated with the motor water channel 14 through a motor water outlet, and the exchanger oil channel 22 is communicated with the water jacket oil channel 132.

The motor housing 11 is provided with an oil pump 3, an inlet of the oil pump 3 is communicated with the oil storage cavity 111, an outlet of the oil pump 3 is communicated with the oil passage 22 of the exchanger,

as shown in fig. 18, the motor cooling device 10 is cooled as follows, and external cooling water enters the motor water passage 14 through the motor water inlet and then enters the exchanger water passage 21 from the motor water outlet. The cooling water contacts with the outer surface of the motor water jacket 13 in the motor water channel 14, and absorbs the heat emitted by the motor water jacket 13. The oil pump 3 pumps out the cooling oil in the oil reservoir chamber 111 and delivers the cooling oil to the exchanger oil passage 22. At this time, the cooling water in the exchanger water passage 21 absorbs the heat of the cooling oil in the exchanger oil passage 22, and cools the cooling oil. The cooling water in the exchanger water passage 21 then flows out to participate in the water circulation of the vehicle, and the cooling oil in the exchanger oil passage 22 flows into the water jacket oil passage 132 and then into the accommodation chamber 131. The cooling oil introduced into the accommodating chamber 131 is poured on the motor stator 12 to contact the stator winding 121, thereby absorbing heat. The cooling oil then flows back from the water jacket oil outlet into the oil storage chamber 111 for the next cycle.

The motor cooling device 10 is provided with two modes of water cooling and oil cooling, and the cooling effect is greatly improved. And the cooling oil flows into the accommodating cavity 131 to be in direct contact with the motor stator 12 to absorb heat, so that the heat of the motor stator 12 can be well reduced, core parts are protected, and the probability of faults is reduced.

Optionally, the motor housing 11 encloses the motor water channel 14 with the motor water jacket 13 and sealing is achieved by welding around. As shown in fig. 3 to 6, there are a first weld 101, a second weld 102, a third weld 103, and a fourth weld 104 between the motor housing 11 and the motor water jacket 13. Specifically, the motor housing 11 is provided with a first housing edge, a second housing edge, a third housing edge, and a fourth housing edge. The motor water jacket 13 is provided with a first water jacket edge, a second water jacket edge, a third water jacket edge, and a fourth water jacket edge. The first shell edge and the first water jacket edge are welded to form a first weld 101. The second shell edge and the second water jacket edge are welded to form a second weld 102. The third shell edge and the third water jacket edge are welded to form a third weld 103. The fourth shell edge and the fourth water jacket edge are welded to form a fourth weld 104.

In one embodiment, as shown in fig. 1-3, a motor controller 4 is connected to the motor main body 1, and an electric control water channel 41 is disposed in the motor controller 4, and the electric control water channel 41 is connected to the motor water channel 14 through a sealing tube 42.

Specifically, the motor housing 11 is connected with an oil motor controller 4, an electric control water channel 41 is arranged in the motor controller, and the electric control water channel 41 is communicated with the motor water channel 14. The cooling water first enters the electric control water passage 41 and then the motor water passage 14. The motor controller 4 is thus subjected to the temperature lowering process.

The electric control water channel 41 is a cavity surrounded by an electric control radiator and a power module in the motor controller 4, and the electric control radiator and the power module are sealed by rubber sealing rings. The cooling water can absorb heat of the electric control radiator and the power module when passing through the electric control water channel 41.

The electric control water channel 41 is connected with the motor water channel 14 through the sealing pipe 42, so that the high integration of the electric control water channel 41 and the motor water channel 14 is realized. Cooling water enters the electric control water channel 41, passes through the sealing pipe 42, and then enters the motor water channel 14 from the motor water inlet.

In one embodiment, as shown in fig. 10 to 13, the motor housing 11 is provided with a first oil passage 113 communicating with the motor exchanger oil passage 22 and a second oil passage 114 communicating with the water jacket oil passage 132. The motor housing 11 is provided with a connecting cover plate 15, a cover plate oil duct 151 is arranged in the connecting cover plate 15, one end of the cover plate oil duct 151 is communicated with the first oil duct 113, and the other end of the cover plate oil duct 151 is communicated with the second oil duct 114.

The exchanger oil passage 22 communicates with the water jacket oil passage 132 through an oil passage provided inside the motor housing 11. Specifically, a first oil passage 113 and a second oil passage 114 are provided in the motor housing 11. A connection cover plate 15 is provided at the outer side of the motor housing 11, and a cover plate oil passage 151 is provided in the connection cover plate 15. One end of the first oil passage 113 communicates with the exchanger oil passage 22, the other end communicates with one end of the cover plate oil passage 151, the other end of the cover plate oil passage 151 communicates with one end of the second oil passage 114, and the other end of the second oil passage 114 communicates with the water jacket oil passage 132. The cooling oil flows out of the exchanger oil passage 22, enters the first oil passage 113, then enters the second oil passage 114 through the cover plate oil passage 151, and then enters the water jacket oil passage 132. So arranged, the first oil passage 113 and the second oil passage 114 are joined by the connecting cover 15 connected to the outside of the motor housing 11. The design of the oil duct in the motor shell 11 is simplified, the complex design in the motor shell 11 is avoided, and the processing difficulty is increased.

Alternatively, as shown in fig. 12, the first oil passage 113 is formed to communicate with the outside of the motor housing 11, and the process hole left by the processing is closed with a sealing plug.

Optionally, the connection cover 15 is detachably connected to the motor housing 11.

In one embodiment, as shown in fig. 12 to 13 and 16, a water jacket oil hole 133 is provided in the motor water jacket 13, and the water jacket oil passage 132 communicates with the accommodation chamber 131 through the water jacket oil hole 133. The motor stator 12 is provided with an oil guide plate 122 for guiding oil to the stator winding 121, and the oil guide plate 122 is located between the stator winding 121 and the water jacket oil hole 133.

Specifically, one end of the water jacket oil hole 133 communicates with the water jacket oil passage 132, and the other end communicates with the accommodation chamber 131. The water jacket oil passage 132 is located above the water jacket oil outlet hole, and the cooling oil in the water jacket oil passage 132 flows into the accommodating chamber 131 through the water jacket oil hole 133 under the influence of gravity. An oil guide plate 122 is provided on the motor stator 12, and the oil guide plate 122 is located below the water jacket oil hole 133 and extends toward the stator winding 121. After flowing out from the water jacket oil hole 133, the cooling oil falls onto the oil guide disc 122, and then falls onto the stator winding 121 along the oil guide disc 122, so that the stator winding 121 is sprayed. The cooling oil poured on the stator winding 121 continues to drip down, converges to the water jacket oil outlet, flows out from the water jacket oil outlet, and flows back into the oil storage cavity 111.

Optionally, the motor stator 12 has stator windings 121 at both ends, and each stator winding 121 is provided with an oil guide disc 122. The motor water jacket 13 has two water jacket oil holes 133 thereon, each water jacket oil hole 133 corresponding to one oil guide pan 122.

In one embodiment, as shown in fig. 1 to 3, 14 to 16, and 18, the motor stator 12 includes a stator rotating shaft 123 rotatable in the accommodation chamber 131, and the stator rotating shaft 123 is provided with a rotating shaft oil passage 1231 and a rotating shaft oil hole 1232. The exchanger oil passage 22 communicates with the rotary shaft oil passage 1231, and the rotary shaft oil passage 1231 communicates with the accommodation chamber 131 through the rotary shaft oil hole 1232.

Specifically, the motor stator 12 includes a stator shaft 123, and the stator winding 121 is connected to the stator shaft 123. A rotation shaft oil passage 1231 and a rotation shaft oil hole 1232 are provided in the stator rotation shaft 123, one end of the rotation shaft oil hole 1232 communicates with the rotation shaft oil passage 1231, and the other end communicates with the accommodation chamber 131.

A third oil passage 115 is further provided in the motor housing 11, and one end of the third oil passage 115 communicates with the exchanger oil passage 22 and the other end communicates with the rotary shaft oil passage 1231. A part of the cooling oil flowing out of the exchanger oil passage 22 enters the water jacket oil passage 132, and a part enters the rotating shaft oil passage 1231 through the third oil passage 115.

The cooling oil in the rotating shaft oil duct 1231 is thrown out from the rotating shaft oil hole 1232 to enter the accommodating cavity 131 under the centrifugal force action of rotation of the rotating shaft, so that the oil throwing and heat dissipation of the motor stator 12 are realized. The cooling oil is thrown out to form a plurality of oil drops, and contacts the stator winding 121. This enlarges the contact area between the cooling oil and the stator winding 121, and further improves the cooling efficiency.

Alternatively, the third oil passage 115 may be designed entirely in the motor housing 11, or the combination of the first oil passage 113, the second oil passage 114 and the connecting cover 15 may be referred to as the foregoing, which is not described herein.

In one embodiment, as shown in fig. 16 and 18, a balancing plate 124 is disposed on the stator rotating shaft 123, an oil outlet 1241 opening toward the stator winding 121 is disposed in the balancing plate 124, and the oil outlet 1241 communicates with the rotating shaft oil hole 1232.

Specifically, the balance plate 124 is disposed at one side of the stator winding 121, and the balance plate 124 is provided with an oil outlet 1241, and the oil outlet 1241 communicates with the rotation shaft oil hole 1232 and faces the stator winding 121. The balance plate 124 has a guiding function, and the cooling oil is thrown out and then directly moves towards the stator winding 121, so that the cooling oil can be quickly contacted with the stator winding 121, and the utilization rate of the cooling oil is improved.

In one embodiment, as shown in fig. 9 to 10 and 18, a rough filter 5 and a fine filter 6 are provided on the motor body 1, the rough filter 5 is connected between the oil reservoir 111 and the oil pump 3, and the fine filter 6 is connected between the oil pump 3 and the water-oil heat exchanger 2.

Specifically, a coarse filter 5 and a fine filter 6 are further arranged in the motor shell 11, a coarse filter oil inlet of the coarse filter 5 is communicated with the oil storage cavity 111, and a coarse filter oil outlet of the coarse filter 5 is connected with an oil inlet of the oil pump 3. The fine filter oil inlet of the fine filter 6 is connected with the oil outlet of the oil pump 3, and the fine filter oil outlet of the fine filter 6 is connected with the exchanger oil duct 22. When the oil pump 3 is operated, the cooling oil in the oil reservoir 111 is first sucked into the rough filter 5, and larger-particle impurities are filtered by the screen of the rough filter 5. The filtered cooling oil enters the oil pump 3 through the rough filtering oil outlet, and is discharged into the fine filtering filter 6 by the oil pump 3. The cooling oil that has entered the fine filter 6 is filtered by the filter screen of the fine filter 6 for small particle foreign matter filtration. Therefore, the cleanliness of the cooling oil is guaranteed, the abrasion of impurities to oil duct parts is reduced, and the service life is prolonged.

In one embodiment, as shown in fig. 1, a speed reducer 7 is provided on a motor main body 1, and the speed reducer 7 is provided with a speed reducer housing 71 and a speed reduction bearing (not shown) mounted in the speed reducer housing 71. The speed reducer housing 71 is provided with a connecting oil passage (not shown) opening toward the speed reducer bearing, the connecting oil passage communicating with the exchanger oil passage 22.

Specifically, the speed reducer 7 has a speed reducer housing 71 and a speed reducer bearing, the speed reducer housing 71 having a housing cavity, the speed reducer bearing being located in the housing cavity. A connecting oil passage is provided in the decelerator casing 71, one end of which is communicated with the exchanger oil passage 22, and the other end of which is communicated with the casing cavity. The portion of the cooling oil flowing out of the exchanger oil passage 22 flows into the connecting oil passage and then into the housing chamber, contacting the reduction bearing to perform oil-cooling of the reduction bearing.

Alternatively, the decelerator casing 71 is provided with an oil decelerator 7 oil chamber, and the decelerator 7 oil chamber communicates with the oil pump 3 and the casing chamber. The cooling oil returns to the oil cavity of the speed reducer 7 for recycling after cooling the speed reducer bearing. In other embodiments, the speed reducer 7 oil chamber communicates with the oil reservoir chamber 111 of the motor housing 11, and the oil pump 3 communicates with the speed reducer 7 oil chamber or the oil reservoir chamber 111.

Alternatively, the design of the oil passages in the speed reducer housing 71 may be referred to the above-described design of the respective oil passages in the motor housing 11, for example, the structure of the connecting oil passage is similar to that of the water jacket oil passage 132. Or, the speed reducer 7 is internally provided with an oil speed reducer 7 rotating shaft, and the speed reducer 7 rotating shaft is similar to the stator rotating shaft 123 in structure and is also provided with a rotating shaft oil duct 1231. So that the oil pouring heat dissipation and the oil throwing heat dissipation of the speed reducer 7 can be realized.

In one embodiment, the motor main body 1 is provided with a differential (not shown) provided with a differential case and a linear shaft (not shown) mounted in the differential case. The differential case is provided with a communication oil passage (not shown) that opens toward the spool, and the communication oil passage communicates with the exchanger oil passage 22.

Specifically, the differential has a differential housing with a mounting cavity 112 and a spool positioned within the mounting cavity 112. A communication oil passage is provided in the differential case, one end of which communicates with the exchanger oil passage 22, and the other end communicates with the installation cavity 112. The part of the cooling oil flowing out of the exchanger oil passage 22 flows into the communication oil passage and then into the installation cavity 112, contacting the spool to perform oil-cooling of the spool.

Alternatively, the oil passage design in the differential case refers to the oil passage design of the intermediate motor case 11 and the oil passage design of the speed reducer case 71 described above, and will not be described in detail herein.

In one embodiment, the motor housing 11 is provided with a fourth oil passage 116, the fourth oil passage 116 communicates with the exchanger oil passage 22, and then the fourth oil passage 116 communicates with the connecting oil passage and the communicating oil passage in two branches, respectively.

An electric drive apparatus is provided according to the present application, comprising a motor cooling apparatus 10 according to any one of the above.

The specific structure and function of the motor cooling device 10 are referred to in the foregoing description, and will not be described in detail herein. The motor cooling device 10 has a good cooling effect, and the electric driving device is not easy to damage.

A vehicle (not shown) according to an aspect of the present application includes the motor cooling device according to any one of the above.

The specific structure and function of the electric drive are not described in detail herein, with reference to the relevant matters in the foregoing description. The electric driving device has good cooling effect and is not easy to fail, thereby improving the quality of the vehicle.

As shown in fig. 1-19, the method for cooling oil and water provided in the present application includes a cooling step of cooling by using the motor cooling device 10 of any one of the above-mentioned aspects, the cooling step is as follows,

the cooling water enters the motor water passage 14 from the outside of the motor housing 11 and then flows into the exchanger water passage 21 of the water-oil heat exchanger 2.

The oil pump 3 pumps the cooling oil from the oil reservoir 111 and delivers the cooling oil to the exchanger oil passage 22 of the water-oil heat exchanger 2.

After the cooling oil in the exchanger oil duct 22 exchanges heat with the cooling water in the exchanger water duct 21, the cooling oil enters the accommodating cavity 131 through the water jacket oil duct 132 to cool the motor stator 12.

And S04, cooling oil in the accommodating cavity 131 flows back into the oil storage cavity 111 after the motor stator 12 is cooled down.

The specific structure and function of the motor cooling device 10 are referred to in the foregoing description, and are not described herein.

The specific steps of cooling by using the motor cooling device 10 are as follows, cooling water in a vehicle enters the motor water channel 14, the cooling water initially cools the motor water jacket 13 in the motor water channel 14, and then enters the exchanger water channel 21. The cooling oil in the oil reservoir chamber 111 is pumped by the oil pump 3 and delivered into the exchanger oil passage 22. The cooling water absorbs the heat of the cooling oil, so that the utilization rate of the cooling water is further improved. The cooling water absorbs heat and flows into a water circulation system of the vehicle for circulation. The cooled cooling oil flows into the water jacket oil duct 132, and then enters the accommodating cavity 131 to contact with the motor stator 12, so as to cool the motor stator 12.

The cooling method adopts two modes of water cooling and oil cooling simultaneously, and the double cooling ensures better cooling effect. And when the oil is cold, the cooling oil is directly contacted with the motor stator 12, so that the cooling effect on the motor stator 12 is improved, and the possibility of faults of the motor stator 12 is reduced.

Alternatively, after the cooling oil enters the accommodating chamber 131 through the water jacket oil passage 132, it is guided to flow toward the stator winding 121 through the oil guide pan 122.

Alternatively, a portion of the cooling oil flowing out of the exchanger oil passage 22 is thrown into the accommodating chamber 131 through the shaft oil passage 1231 of the stator shaft 123 to be in contact with the stator winding 121.

In one embodiment, a filtering step is included.

The cooling oil flowing out of the oil reservoir 111 is filtered by the coarse filter 5 and then enters the oil pump 3.

The cooling oil flowing out from the oil pump 3 is filtered by the fine filter 6 and then enters the exchanger oil passage 22.

After flowing out from the oil outlet cavity, the cooling oil passes through the rough filter 5, enters the oil pump 3, and is discharged by the oil pump 3 to enter the fine filter 6. The twice filtration reduces the impurity in the cooling oil, so that the cooling oil is cleaner.

In one embodiment, the step of cooling the retarder 7 and the differential is included.

Part of the cooling oil flowing out of the exchanger oil passage 22 enters the reducer housing 71 of the reducer 7 through the connecting oil passage on the reducer 7, and cools down the reducer bearing of the reducer 7.

The part of the cooling oil flowing out of the exchanger oil duct 22 enters the differential case of the differential through the communicating oil duct on the differential to cool the linear shaft of the differential.

Specifically, the motor main body 1 is also provided with a speed reducer 7 and a differential mechanism, part of cooling oil flowing out of the exchanger oil duct 22 enters the motor water jacket 13 to cool the motor stator 12, part of cooling oil enters the speed reducer shell 71 to cool the speed reducing bearing, and part of cooling oil enters the differential mechanism shell to cool the linear shaft. Thus realizing the cooling of a plurality of different parts.

In summary, the present application provides a motor cooling device 10, an electric drive device vehicle, and an oil-water cooling method, wherein the motor cooling device 10 includes a motor main body 1, a water-oil heat exchanger 2, and a motor stator 12, and the water-oil heat exchanger 2 is connected to the motor main body 1; the motor main body 1 comprises a motor shell 11 and a motor water jacket 13, and a motor water channel 14 is arranged between the motor shell 11 and the motor water jacket 13; the motor shell 11 is provided with an oil storage cavity 111, the motor water jacket 13 is provided with a containing cavity 131 and a water jacket oil duct 132, the motor stator 12 is arranged in the containing cavity 131, and the motor stator 12 is provided with a stator winding 121; the oil storage chamber 111 and the water jacket oil passage 132 are respectively communicated with the accommodation chamber 131; the water-oil heat exchanger 2 has an exchanger water passage 21 and an exchanger oil passage 22, the motor water passage 14 communicates with the exchanger water passage 21, the oil reservoir 111 is connected to the exchanger oil passage 22 through the oil pump 3, and the exchanger oil passage 22 communicates with the water jacket oil passage 132. In the motor cooling device 10, cooling water enters the motor water channel 14 to cool the motor water jacket 13, and the cooling water also absorbs heat of the cooling oil through the water-oil heat exchanger 2. The cooling oil then enters the receiving chamber 131 to be in direct contact with the motor stator 12, absorbing heat. The cooling effect is improved by combining water cooling and oil cooling, and cooling oil is in direct contact with the motor stator 12, so that the cooling efficiency of the motor stator 12 can be improved. The electric drive device and the vehicle with the motor cooling device 10 have better quality and are not easy to break down. The cooling effect of the oil-water cooling method is better.

The above technical schemes can be combined according to the need to achieve the best technical effect.

The foregoing is only the principles and preferred embodiments of the present application. It should be noted that several other variants are possible to those skilled in the art on the basis of the principles of the present application and should also be considered as the protection scope of the present application.

Claims (13)

1. The motor cooling device is characterized by comprising a motor main body and a water-oil heat exchanger, wherein the water-oil heat exchanger is connected to the motor main body;

the motor main body comprises a motor shell, a motor stator and a motor water jacket arranged in the motor shell, and a motor water channel is arranged between the motor shell and the motor water jacket;

the motor shell is provided with an oil storage cavity, the motor water jacket is provided with an accommodating cavity and a water jacket oil duct, the motor stator is arranged in the accommodating cavity, and the motor stator is provided with a stator winding;

the oil storage cavity and the water jacket oil duct are respectively communicated with the accommodating cavity;

the water-oil heat exchanger is provided with an exchanger water channel and an exchanger oil channel, the motor water channel is communicated with the exchanger water channel, the oil storage cavity is connected with the exchanger oil channel through an oil pump, and the exchanger oil channel is communicated with the water jacket oil channel.

2. The motor cooling device according to claim 1, wherein the motor body is connected with a motor controller, and an electric control water channel is arranged in the motor controller and is connected with the motor water channel through a sealing pipe.

3. The motor cooling device according to claim 1, wherein a first oil passage communicating with the motor exchanger oil passage and a second oil passage communicating with the water jacket oil passage are provided on the motor housing;

the motor is characterized in that a connecting cover plate is arranged on the motor shell, a cover plate oil duct is arranged in the connecting cover plate, one end of the cover plate oil duct is communicated with the first oil duct, and the other end of the cover plate oil duct is communicated with the second oil duct.

4. The motor cooling device according to claim 1, wherein a water jacket oil hole is provided in the motor water jacket, and the water jacket oil passage communicates with the accommodation chamber through the water jacket oil hole;

the motor stator is provided with an oil guide disc for guiding oil for the stator winding, and the oil guide disc is positioned between the stator winding and the water jacket oil hole.

5. The motor cooling apparatus according to claim 1, wherein the motor stator includes a stator rotating shaft rotatable in the accommodation chamber, the stator rotating shaft being provided with a rotating shaft oil passage and a rotating shaft oil hole;

the exchanger oil duct is communicated with the rotating shaft oil duct, and the rotating shaft oil duct is communicated with the accommodating cavity through the rotating shaft oil hole.

6. The motor cooling device according to claim 5, wherein a balance plate is provided on the stator shaft, an oil outlet opening toward the stator winding is provided in the balance plate, and the oil outlet communicates with the shaft oil hole.

7. The motor cooling device according to claim 1, wherein a coarse filter and a fine filter are provided on the motor main body, the coarse filter being connected between the oil storage chamber and the oil pump, the fine filter being connected between the oil pump and the water-oil heat exchanger.

8. The motor cooling device according to claim 1, wherein a speed reducer is provided on the motor main body, the speed reducer being provided with a speed reducer housing and a speed reduction bearing installed in the speed reducer housing;

the speed reducer shell is provided with a connecting oil duct with an opening facing the speed reducer bearing, and the connecting oil duct is communicated with the exchanger oil duct.

9. An electric drive comprising a motor cooling device according to any one of claims 1-8.

10. A vehicle comprising the electric drive apparatus of claim 9.

11. An oil-water cooling method, characterized by comprising a cooling step of cooling by using the motor cooling device according to any one of claims 1 to 8, said cooling step being as follows,

cooling water enters the motor water channel from the outside of the motor shell and then flows into the exchanger water channel of the water-oil heat exchanger;

the oil pump pumps cooling oil out of the oil storage cavity and conveys the cooling oil into the oil passage of the exchanger of the water-oil heat exchanger;

after the cooling oil in the exchanger oil duct exchanges heat with the cooling water in the exchanger water channel, the cooling oil enters the accommodating cavity through the water jacket oil duct to cool the motor stator;

the cooling oil in the accommodating cavity flows back into the oil storage cavity after the motor stator is cooled down.

12. The oil-water cooling method according to claim 11, comprising a filtering step;

the cooling oil flowing out of the oil storage cavity is filtered by a coarse filter and then enters the oil pump;

the cooling oil flowing out from the oil pump is filtered by a fine filter and then enters the exchanger oil passage.

13. The oil-water cooling method according to claim 11, comprising the step of cooling the decelerator;

and part of the cooling oil flowing out of the exchanger oil duct enters a speed reducer shell of the speed reducer through a connecting oil duct on the speed reducer to cool a speed reducer bearing of the speed reducer.