Electric vehicle motor oil cooling system and its matching motor

Abstract

The present application relates to the field of electric vehicle motor cooling systems, and more particularly to an electric vehicle motor oil cooling system and an adapted motor thereof. Among them, an electric vehicle motor oil cooling system includes a cooling oil tank, an oil pump, a cooling oil spray device, and a cooling oil recovery device. The oil pump is installed in the cooling oil tank. The cooling oil spray device includes an oil spray pipe and an oil supply pipe. The oil spray pipe is used to spray cooling oil on the motor rotor. The oil supply pipe is used to connect the oil spray pipe and the oil pump. The cooling oil recovery device recovers the cooling oil for recycling. During cooling, the oil pump transports the cooling oil in the cooling oil tank through the oil supply pipe to the oil spray pipe to spray out the cooling oil to cool the motor rotor. The cooling effect of directly cooling the motor rotor is good, and the evaporated oil vapor lubricates and prevents rust on the motor rotor.

Description

Technical Field

[0001] The present application relates to the field of an electric vehicle motor cooling system, and in particular to an electric vehicle motor oil cooling system and an adapted motor thereof. Background Art

[0002] As one of the three major components of an electric vehicle, the motor is the heart of the electric vehicle and is responsible for converting the battery's electrical energy into kinetic energy. Therefore, as the main power source, the motor needs a good working environment, such as a more suitable working temperature and humidity.

[0003] However, during the operation of the motor, the motor rotor will generate a large amount of heat, causing the temperature of the motor's working environment to rise sharply. Long-term operation under high temperature conditions will lead to accelerated aging of motor components and degradation of motor performance. Therefore, a heat dissipation structure needs to be set on the motor to dissipate the heat of the motor rotor.

[0004] Usually, the heat dissipation of the motor is carried out by a fan. The fan is installed at one end of the motor in the axial direction to blow air to the motor for cooling. However, since the wind from the fan is difficult to blow into the interior of the motor and the part of the motor that generates the most heat is the motor rotor, the fan has a poor cooling effect on the motor. Utility Model Content

[0005] In order to solve the problem of poor heat dissipation effect of the traditional heat dissipation method of dissipating heat from the motor by a fan, the present application provides an electric vehicle motor oil cooling system and an adapted motor thereof.

[0006] In the first aspect, the electric vehicle motor oil cooling system provided by the present application adopts the following technical solution:

[0007] An electric vehicle motor oil cooling system comprises a cooling oil tank, an oil pump, a cooling oil spray device and a cooling oil recovery device. The cooling oil tank is installed in the frame of the electric vehicle, the oil pump is installed in the cooling oil tank, the cooling oil spray device comprises an oil spray pipe and an oil supply pipe, the oil spray pipe is installed inside the motor housing, the oil supply pipe is used to connect the oil spray pipe and the oil pump, the oil spray pipe sprays toward the motor rotor, and the cooling oil recovery device is used to collect the sprayed cooling oil and then transport it to the cooling oil tank.

[0008] By adopting the above technical solution, when the motor rotor rotates and generates heat, the oil pump is started, and the cooling oil in the cooling oil tank is transported to the oil injection pipe through the oil supply pipe by the oil pump, and then sprayed out from the oil injection pipe to cool the motor rotor. Since the motor rotor is cooled directly, the cooling effect is better. At the same time, the oil vapor after the cooling oil is evaporated by the heat of the motor rotor can lubricate and prevent rust on the motor rotor, thereby increasing the working life of the motor rotor. At the same time, the used cooling oil will be recovered by the cooling oil recovery device to the cooling oil tank for recycling.

[0009] Optionally, the cooling oil injection device also includes an oil supply ring, which is coaxially installed with the motor rotor inside the motor housing, the oil supply ring is located at one end of the motor rotor, the oil supply ring is in the shape of a hollow pipe, the oil supply ring is connected to the oil pump through the oil supply pipe, a plurality of oil injection pipes are provided, the oil injection pipes are evenly spaced along the oil supply ring, one end of the oil injection pipe is connected to the side wall of the oil supply ring, the other end of the oil injection pipe is closed, the oil injection pipe is connected to the inside of the oil supply ring, a plurality of injection holes are opened on the oil injection pipe along its length direction, the injection holes spray toward the motor rotor, and the axis of the oil injection pipe is parallel to the axis of the oil supply ring.

[0010] By adopting the above technical solution, the oil injection pipe is fixed in the motor housing through the oil supply ring, and the oil injection pipe is arranged circumferentially along the axis of the motor rotor, so that the cooling oil sprayed by the oil injection pipe is evenly distributed on the motor rotor, which has a better cooling effect on the motor rotor. Moreover, since the oil injection pipe is evenly distributed around the circumference of the motor rotor, the oil injection pipe has less interference with the motor rotor when cutting the magnetic flux lines.

[0011] Optionally, the cooling oil recovery device includes an oil drain pipe and a filtering mechanism, one end of the oil drain pipe passes through the motor housing and is located at the bottom of the motor housing, the oil drain pipe and the motor housing are sealed, and the filtering mechanism is installed on the other end of the oil drain pipe. The filtering mechanism is connected to the cooling oil tank through a pipeline, and the filtering mechanism is used to filter the used cooling oil and then transport it back to the cooling oil tank.

[0012] By adopting the above technical solution, the motor rotor will generate metal debris during operation. After the cooling oil is sprayed on the motor rotor, the metal debris on the motor rotor will be washed down and then discharged through the oil drain pipe. The metal debris on the motor rotor is not easy to interfere with the motor rotor. When the discharged cooling oil flows through the filtering mechanism, the metal debris in the cooling oil is filtered, and the filtered cooling oil will be discharged back into the cooling oil tank for recycling.

[0013] Optionally, the filtering mechanism includes an oil filter box, the oil drain pipe is connected to and communicated with the oil filter box, the oil filter box is connected to the cooling oil tank through a pipeline, there is a potential energy difference between the positions of the oil filter box and the cooling oil tank, and a magnet is provided on the outer bottom wall of the oil filter box.

[0014] By adopting the above technical solution, since the motor rotor is usually made of magnetic metal, the cooling oil can be effectively purified by adsorbing metal debris in the cooling oil through a strong magnet.

[0015] Optionally, the oil filter box is provided with a bottom cover, the bottom wall of the oil filter box is arranged to be open, the bottom cover is detachably mounted on the oil filter box and closes the opening of the oil filter box, and the magnet is arranged on a surface of the bottom cover facing away from the oil filter box.

[0016] By adopting the above technical solution, since the metal debris is adsorbed on the bottom cover by the magnet, when cleaning, it is only necessary to remove the bottom cover and then remove the magnet to clean the metal debris more conveniently.

[0017] In the second aspect, the present application provides an electric vehicle motor oil cooling system adapted to a motor using the following technical solution:

[0018] An electric vehicle motor oil cooling system adapter motor includes a motor housing, a motor rotor and a motor shaft, wherein the motor rotor is mounted on the motor shaft, and the motor shaft is rotatably mounted in the motor housing. A collecting box is provided on the bottom wall of the motor housing, and the bottom wall of the collecting box is open. A collecting plate is detachably mounted on the bottom wall of the collecting box, and one side of the collecting plate is pressed against the collecting box and is concave. One end of the oil drain pipe is sealed and passes through the collecting plate and is located at the bottom of the concave part of the collecting plate.

[0019] By adopting the above technical solution, after the cooling oil enters the motor housing, it will flow into the collection box along the motor housing under the action of gravity, and then be discharged from the oil drain pipe, so the collection of the cooling oil is more convenient.

[0020] Optionally, the motor housing is cylindrical, one end of the motor housing is open, a sealing plate is detachably mounted on the motor housing, the sealing plate closes the opening at one end of the motor housing, and the oil supply ring is mounted on the sealing plate.

[0021] By adopting the above technical solution, when the motor is disassembled and repaired, since the oil supply ring is installed on the sealing plate, the oil supply ring and the fuel injection pipe can be removed simultaneously when the sealing plate is removed, so the overall disassembly of the motor is relatively convenient, and it is easy to inspect and repair the oil supply ring and the fuel injection pipe.

[0022] Optionally, a connecting block is provided on the collecting plate, a connecting hole is formed through the connecting block, the connecting hole is communicated with the interior of the collecting box, one end of the oil drain pipe passes through the connecting hole and is located at the bottom of the recess of the collecting plate, and the end face of the end of the oil drain pipe located in the recess of the collecting plate is an inclined surface, and the end face of the oil drain pipe with the inclined surface faces the direction of the motor housing.

[0023] By adopting the above technical scheme, compared with directly forming a seal between the oil drain pipe and the collecting plate, the sealing effect of forming a seal between the oil drain pipe and the connecting block is better, and the connecting block is used to support the oil drain pipe, so that the oil drain pipe is not easy to shake and tilt, and the sealing connection between the connecting block and the oil drain pipe is relatively stable. At the same time, due to the high viscosity of the oil, the end face of one end of the oil drain pipe located in the recess of the collecting plate is set to an inclined surface, so that the cooling oil can be discharged from the oil drain pipe more smoothly.

[0024] Optionally, an oil delivery channel is provided inside the motor shaft, and the oil delivery channel penetrates one end of the motor shaft. The end of the motor shaft penetrated by the oil delivery channel is connected to the oil pump via the oil supply pipe, and a plurality of oil outlets are opened on the side wall of the motor shaft, and the oil outlets are connected to the oil delivery channel.

[0025] By adopting the above technical solution, the cooling oil is transported to the motor shaft to cool the motor shaft, and then discharged from the motor shaft to cool the motor rotor, thereby further improving the cooling effect on the motor rotor. Moreover, since the motor shaft is directly cooled, the overall cooling effect on the motor rotor is better.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the motor rotor rotates and generates heat, the oil pump is started, and the cooling oil in the cooling oil tank is transported to the oil injection pipe through the oil supply pipe by the oil pump, and then sprayed out from the oil injection pipe to cool the motor rotor. Since the motor rotor is directly cooled, the cooling effect is better. At the same time, the oil vapor after the cooling oil is evaporated by the heat of the motor rotor can lubricate and prevent rust on the motor rotor, thereby increasing the working life of the motor rotor. At the same time, the used cooling oil will be recovered by the cooling oil recovery device to the cooling oil tank for recycling;

[0028] 2. The oil injection pipe is fixed in the motor housing through the oil supply ring, and the oil injection pipe is arranged circumferentially along the axis of the motor rotor, so that the cooling oil sprayed by the oil injection pipe is evenly distributed on the motor rotor, which has a better cooling effect on the motor rotor. In addition, since the oil injection pipe is evenly distributed around the circumference of the motor rotor, the oil injection pipe has less interference with the motor rotor when cutting the magnetic flux lines;

[0029] 3. When disassembling and repairing the motor, since the oil supply ring is installed on the sealing plate, the oil supply ring and the fuel injection pipe can be removed simultaneously when the sealing plate is removed. The overall disassembly of the motor is relatively convenient, and it is also easy to inspect and repair the oil supply ring and the fuel injection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the oil cooling system of the present application.

[0031] Figure 2 It is a three-dimensional structural schematic diagram of the motor of the present application and the oil cooling system thereon.

[0032] Figure 3 It is an exploded schematic diagram of the motor of the present application and its internal structure.

[0033] Figure 4 It is an exploded schematic diagram of the motor of the present application and its internal structure from another direction.

[0034] Figure 5 It is an exploded schematic diagram of the motor housing of the present application.

[0035] Figure 6 It is a cross-sectional view of the motor shaft of the present application.

[0036] Figure 7 It is a cross-sectional view of the oil filter box of the present application.

[0037] Those skilled in the art will appreciate that elements in the drawings are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be exaggerated relative to other elements to help improve understanding of embodiments of the present invention.

[0038] Figure numerals: 1. cooling oil tank; 2. oil pump; 3. cooling oil injection device; 31. oil injection pipe; 311. injection hole; 32. oil supply pipe; 33. oil supply ring; 4. cooling oil recovery device; 41. oil drain pipe; 42. filtering mechanism; 421. oil filter box; 4211. bottom cover; 422. magnet; 5. motor housing; 51. collecting box; 52. sealing plate; 6. motor rotor; 7. motor shaft; 71. oil delivery channel; 72. oil outlet; 8. collecting plate; 81. connecting block; 811. connecting hole. Implementation

[0039] The following is combined with Figure 1-7 This application is described in further detail.

[0040] The embodiment of the present application discloses an electric vehicle motor oil cooling system and an adapted motor thereof.

[0041] Reference Figure 1 , Figure 2 and Figure 3An electric vehicle motor oil cooling system includes a cooling oil tank 1, an oil pump 2, a cooling oil injection device 3 and a cooling oil recovery device 4.

[0042] Reference Figure 1 , Figure 2 and Figure 4 During installation, the cooling oil tank 1 is fixedly mounted on the frame of the electric vehicle, the oil pump 2 is fixedly mounted in the cooling oil tank 1, and the cooling oil injection device 3 includes an oil supply pipe 32 and a plurality of oil injection pipes 31. The oil supply pipe 32 connects the oil injection pipe 31 and the oil pump 2. The oil injection pipe 31 is provided with an injection hole 311 to spray cooling oil on the motor rotor 6 for cooling. The cooling oil recovery device 4 includes an oil drain pipe 41 and a filter mechanism 42. The oil drain pipe 41 is used to discharge the cooling oil in the motor, and the filter mechanism 42 is used to filter the discharged cooling oil. The oil drain pipe 41, the filter mechanism 42 and the cooling oil tank 1 are connected by a pipeline.

[0043] Reference Figure 2 and Figure 5 An electric vehicle motor oil cooling system adaptable motor includes a motor housing 5, a motor rotor 6 and a motor shaft 7. The motor housing 5 is cylindrical, and one end surface of the motor housing 5 is set to be open. A sealing plate 52 is detachably mounted on the motor housing 5 by bolts, and the sealing plate 52 seals the opening of the motor housing 5. The motor shaft 7 is coaxially rotatably mounted in the motor housing 5, and the motor rotor 6 is coaxially fixedly mounted on the motor shaft 7.

[0044] Reference Figure 3 and Figure 4 The cooling oil injection device 3 also includes an oil supply ring 33, which is located inside the motor housing 5 and is detachably mounted on the sealing plate 52. The oil supply ring 33 is coaxial with the motor rotor 6. The oil supply ring 33 is tubular and connected to the oil pump 2 through the oil supply pipe 32. The oil injection pipes 31 are circumferentially spaced around the axis of the oil supply ring 33, and the axis of the oil injection pipes 31 is parallel to the axis of the oil supply ring 33. One end of the oil injection pipes 31 is welded to the side wall of the oil supply ring 33 and communicated with the inside of the oil supply ring 33, and the other end of the oil injection pipes 31 is closed.

[0045] Reference Figure 1 and Figure 3 The oil pump 2 delivers the cooling oil to the fuel injection pipe 31 through the fuel supply pipe 32 and the fuel supply ring 33 in turn. The injection hole 311 on the fuel injection pipe 31 is opened on the side of the side wall of the fuel injection pipe 31 facing the axis of the fuel supply ring 33. After the cooling oil enters the fuel injection pipe 31, it is sprayed from the injection hole 311 to perform fuel injection cooling on the motor rotor 6 coaxial with the fuel supply ring 33.

[0046] Reference Figure 6An oil delivery channel 71 is coaxially opened in the motor shaft 7, and the oil delivery channel 71 is connected to the oil pump 2 through the oil supply pipe 32. Two oil outlets 72 are also opened on the side wall of the motor shaft 7. The cooling oil cools the motor shaft 7 and is discharged through the oil outlet 72 to assist in cooling the motor rotor 6, further improving the cooling effect.

[0047] Reference Figure 2 and Figure 5 A rectangular collecting box 51 is integrally provided at the bottom of the motor housing 5. The bottom of the collecting box 51 is open. A collecting plate 8 is provided on the collecting box 51. The collecting plate 8 is detachably mounted on the collecting box 51 by bolts. One side of the collecting plate 8 is tightly pressed against the bottom wall of the collecting box 51 to close the bottom opening of the collecting box 51. The side of the collecting plate 8 pressed against the collecting box 51 is concave, so that the collecting plate 8 is in a basin shape as a whole.

[0048] Reference Figure 2 and Figure 5 A connecting block 81 is also integrally provided on the outer wall of the collecting plate 8, and a connecting hole 811 is formed through the connecting block 81, and the connecting hole 811 is communicated with the inner depression of the collecting plate 8, and one end of the drain pipe 41 of the cooling oil recovery device 4 passes through the connecting hole 811 and is located at the bottom of the inner depression of the collecting plate 8, and the drain pipe 41 is sealed with the side wall of the connecting hole 811. After cooling the motor rotor 6, the cooling oil flows along the inner wall of the motor housing 5 into the depression of the collecting plate 8, and then is discharged through the drain pipe 41.

[0049] Reference Figure 5 The end surface of one end of the oil drain pipe 41 located in the recess of the collecting plate 8 is an inclined surface, and the end surface faces the direction of the motor housing 5, so that the cooling oil with a higher viscosity can be discharged more smoothly along the oil drain pipe 41.

[0050] Reference Figure 7 The filter mechanism 42 includes an oil filter box 421, which is connected to the oil drain pipe 41 and the cooling oil tank 1 through a pipeline. The bottom wall of the oil filter box 421 is open and closed by a bottom cover 4211, and the bottom cover 4211 is detachably connected to the oil filter box 421 through bolts. A magnet 422 is fixedly installed on a side wall of the bottom cover 4211 away from the oil filter box 421. During the operation of the motor rotor 6, magnetic metal debris will be generated. After the cooling oil washes down the metal debris, the cooling oil mixed with the metal debris is discharged into the oil filter box 421 through the oil drain pipe 41. The magnet 422 absorbs the metal debris in the cooling oil onto the bottom cover 4211 to filter the cooling oil, and then the cooling oil flows along the pipeline to the cooling oil tank 1 for recycling.

[0051] The implementation principle of an electric vehicle motor oil cooling system and its adapted motor in an embodiment of the present application is as follows: after the motor of the electric vehicle is started, the oil pump 2 starts to work, and the cooling oil is transported to the oil supply ring 33 through the oil supply pipe 32, and then enters the oil injection pipe 31, and is sprayed out from the injection hole 311 in the oil injection pipe 31 to cool the motor rotor 6. At the same time, the cooling oil synchronously enters the oil delivery channel 71 of the motor shaft 7 to cool the motor shaft 7, and the cooling oil is sprayed out from the oil outlet 72 to assist in cooling the motor rotor 6.

[0052] The cooled cooling oil flows along the inner wall of the motor housing 5 to the depression of the collecting plate 8, and then is discharged into the oil filter box 421 along the oil drain pipe 41. The magnet 422 of the oil filter box 421 absorbs and filters the metal debris in the cooling oil, and then the cold zone flows through the pipeline to the cooling oil tank 1 for circulation.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric vehicle motor oil cooling system, characterized in that: The invention comprises a cooling oil tank (1), an oil pump (2), a cooling oil spray device (3) and a cooling oil recovery device (4), wherein the cooling oil tank (1) is installed in the frame of the electric vehicle, the oil pump (2) is installed in the cooling oil tank (1), the cooling oil spray device (3) comprises an oil spray pipe (31) and an oil supply pipe (32), the oil spray pipe (31) is installed in the motor housing (5), the oil supply pipe (32) is used to connect the oil spray pipe (31) and the oil pump (2), the oil spray pipe (31) sprays toward the motor rotor (6), and the cooling oil recovery device (4) is used to collect the sprayed cooling oil and then transport it to the cooling oil tank (1).

2. The electric vehicle motor oil cooling system according to claim 1, characterized in that: The cooling oil injection device (3) further comprises an oil supply ring (33), the oil supply ring (33) being coaxially mounted with the motor rotor (6) inside the motor housing (5), the oil supply ring (33) being located at one end of the motor rotor (6), the oil supply ring (33) being in the shape of a hollow pipe, the oil supply ring (33) being connected to the oil pump (2) via the oil supply pipe (32), a plurality of oil injection pipes (31) being provided, the oil injection pipes (31) being arranged along the oil supply ring (3 3) are evenly spaced, one end of the fuel injection pipe (31) is connected to the side wall of the fuel supply ring (33), the other end of the fuel injection pipe (31) is closed, the fuel injection pipe (31) is connected to the inside of the fuel supply ring (33), a plurality of injection holes (311) are formed on the fuel injection pipe (31) along its length, the injection holes (311) spray toward the motor rotor (6), and the axis of the fuel injection pipe (31) is parallel to the axis of the fuel supply ring (33).

3. The electric vehicle motor oil cooling system according to claim 1, characterized in that: The cooling oil recovery device (4) comprises an oil drain pipe (41) and a filtering mechanism (42); one end of the oil drain pipe (41) passes through the motor housing (5) and is located at the bottom of the motor housing (5); the oil drain pipe (41) and the motor housing (5) are sealed; the filtering mechanism (42) is installed on the other end of the oil drain pipe (41); the filtering mechanism (42) is connected to the cooling oil tank (1) via a pipeline; the filtering mechanism (42) is used to filter the used cooling oil and then transport it back to the cooling oil tank (1).

4. The electric vehicle motor oil cooling system according to claim 3, characterized in that: The filtering mechanism (42) comprises an oil filter box (421), the oil drain pipe (41) is connected to and communicates with the oil filter box (421), the oil filter box (421) is connected to the cooling oil tank (1) via a pipeline, there is a potential energy difference between the positions of the oil filter box (421) and the cooling oil tank (1), and a magnet (422) is provided on the outer bottom wall of the oil filter box (421).

5. The electric vehicle motor oil cooling system according to claim 4, characterized in that: The oil filter box (421) is provided with a bottom cover (4211); the bottom wall of the oil filter box (421) is arranged in an open shape; the bottom cover (4211) is detachably mounted on the oil filter box (421) and closes the opening of the oil filter box (421); and the magnet (422) is arranged on a surface of the bottom cover (4211) facing away from the oil filter box (421).

6. An electric vehicle motor oil cooling system adaptable motor, adapted to an electric vehicle motor oil cooling system according to any one of claims 3 to 5, comprising a motor housing (5), a motor rotor (6) and a motor shaft (7), wherein the motor rotor (6) is mounted on the motor shaft (7), and the motor shaft (7) is rotatably mounted in the motor housing (5), characterized in that: A collecting box (51) adapted to the cooling oil recovery device (4) described in any one of claims 3 to 5 is provided on the bottom wall of the motor housing (5); the bottom wall of the collecting box (51) is open; a collecting plate (8) is detachably mounted on the bottom wall of the collecting box (51); one side of the collecting plate (8) is pressed against the collecting box (51) and is concave; one end of the oil drain pipe (41) is sealed and passes through the collecting plate (8) and is located at the bottom of the concave portion of the collecting plate (8).

7. The electric vehicle motor oil cooling system adapter motor according to claim 6, characterized in that: The motor housing (5) is cylindrical, one end of the motor housing (5) is open, a sealing plate (52) is detachably mounted on the motor housing (5), the sealing plate (52) seals the opening at one end of the motor housing (5), and the oil supply ring (33) is mounted on the sealing plate (52).

8. The electric vehicle motor oil cooling system adapter motor according to claim 7, characterized in that: The collecting plate (8) is provided with a connecting block (81), the connecting block (81) is provided with a connecting hole (811), the connecting hole (811) is connected to the inside of the collecting box (51), and one end of the oil drain pipe (41) passes through the connecting hole (811) and is located at the bottom of the depression of the collecting plate (8).

9. The electric vehicle motor oil cooling system adapter motor according to claim 8, characterized in that: An oil delivery passage (71) is provided inside the motor shaft (7), the oil delivery passage (71) passes through one end of the motor shaft (7), the end of the motor shaft (7) passed through by the oil delivery passage (71) is connected to the oil pump (2) via the oil supply pipe (32), and a plurality of oil outlets (72) are provided on the side wall of the motor shaft (7), the oil outlets (72) being in communication with the oil delivery passage (71).

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