Cooling system, transmission and car

Abstract

The present invention provides a cooling system, a gearbox and a car, wherein the cooling system is used for cooling a motor system in a hybrid gearbox, wherein the cooling system is integrated in the hybrid gearbox and comprises an oil pump, a heat exchanger, a drive motor cooling system, a generator cooling system and a rear housing oil storage structure, wherein the oil pump is connected to the heat exchanger, the heat exchanger is connected to the drive motor cooling system and the generator cooling system, the rear housing oil storage structure is mounted on the rear housing of the gearbox, the drive motor cooling system cools the drive motor in the gearbox by spray cooling and oil immersion cooling at the same time, and the generator cooling system cools the generator in the gearbox by spray cooling and oil immersion cooling at the same time.

Description

Technical Field

[0001] The present invention relates to a cooling system, a gearbox and a car, and in particular to a cooling system for cooling a motor system of a hybrid gearbox. Background Art

[0002] Compared with traditional gearboxes, hybrid gearboxes mainly add a motor system. Accordingly, the industry has proposed various solutions to the cooling problem of the motor system in hybrid gearboxes. The cooling of the motor system in a hybrid gearbox is mainly divided into oil cooling and water cooling.

[0003] The water cooling solution uses cooling water circulation to cool the motor system. The motor needs to be sealed with a water jacket to prevent the cooling water from entering the gearbox. The oil cooling solution is basically divided into two categories, namely spray cooling and oil immersion cooling. Spray cooling is to spray oil through the oil pipe to bring the gearbox oil into contact with the motor winding to remove heat; oil immersion cooling is to cool the motor winding by immersing the motor winding in the gearbox oil. Summary of the invention

[0004] One aspect of the present invention aims to solve the technical problem of combining the advantages of spray cooling and oil immersion cooling to cool the motor system uniformly and stably.

[0005] In addition, other aspects of the present invention are also intended to solve or alleviate other technical problems existing in the prior art.

[0006] The present invention provides a cooling system, a gearbox and a car. Specifically, according to one aspect of the present invention, it provides:

[0007] A cooling system for cooling a motor system in a hybrid transmission, wherein the cooling system is integrated in the hybrid transmission, and comprises an oil pump, a heat exchanger, a drive motor cooling system, a generator cooling system and a rear housing oil storage structure, the oil pump is connected to the heat exchanger, the heat exchanger is connected to the drive motor cooling system and the generator cooling system, the rear housing oil storage structure is mounted on the rear housing of the transmission, the drive motor cooling system cools the drive motor in the transmission by spray cooling and oil immersion cooling at the same time, and the generator cooling system cools the generator in the transmission by spray cooling and oil immersion cooling at the same time.

[0008] Optionally, according to one embodiment of the present invention, the drive motor cooling system includes a first mechanical gear bearing plate, a drive motor oil pipe and a drive motor oil storage tank, the first mechanical gear bearing plate is connected to the heat exchanger, the drive motor oil pipe and the first mechanical gear bearing plate are connected, a first valve body unit is constructed on the first mechanical gear bearing plate for distributing the spray cooling oil to the drive motor oil pipe, a first oil spray structure is constructed on the drive motor oil pipe for spraying oil for cooling, the sprayed oil passes through the drive motor and falls into the drive motor oil storage tank and the rear housing oil storage structure to immerse the drive motor in oil for cooling, and the drive motor oil storage tank is arranged below the front winding of the drive motor.

[0009] Optionally, according to one embodiment of the present invention, the generator cooling system includes a second mechanical gear bearing plate, a rear housing oil channel, a generator oil pipe and a generator oil storage tank, the second mechanical gear bearing plate is connected to the heat exchanger, the rear housing oil channel is connected to the second mechanical gear bearing plate, the generator oil pipe is connected to the rear housing oil channel, a second valve body unit is constructed on the second mechanical gear bearing plate for distributing the spray cooling oil to the generator oil pipe, a second oil spray structure is constructed on the generator oil pipe for spraying oil for cooling, the sprayed oil passes through the generator and falls into the generator oil storage tank and the rear housing oil storage structure to immerse the generator in oil for cooling, and the generator oil storage tank is arranged below the front winding of the generator.

[0010] Optionally, according to an embodiment of the present invention, the first valve body unit and the second valve body unit respectively include four solenoid valves for adjusting the amount of cooling oil.

[0011] Optionally, according to an embodiment of the present invention, the first and second oil injection structures are respectively configured to be holes opened in the drive motor oil pipe and the generator oil pipe at the ends close to the drive motor winding and the generator winding.

[0012] Optionally, according to an embodiment of the present invention, the first and second oil injection structures are respectively configured as nozzles installed at the ends of the drive motor oil pipe and the generator oil pipe close to the drive motor winding and the generator winding.

[0013] Optionally, according to an embodiment of the present invention, the rear housing oil storage structure is integrally formed with the housing of the hybrid transmission.

[0014] According to another aspect of the present invention, the present invention provides a gearbox, wherein the gearbox comprises the cooling system described above.

[0015] According to yet another aspect of the present invention, the present invention provides a vehicle, wherein the vehicle comprises the above-mentioned gearbox.

[0016] The benefits of the present invention include: the cooling system of the present invention combines the two cooling methods of oil pipe spray cooling and oil tank immersion cooling to achieve comprehensive cooling, effectively reducing the waste of oil and achieving maximum cooling efficiency with the minimum effective oil volume. Compared with the pure spray cooling method, the number of oil pipes is greatly reduced, from three oil pipes for one motor in the conventional design to only one oil pipe on the top of the motor. Compared with the pure oil immersion cooling method, the amount of oil can be greatly reduced, from the full wrapping requirement to the half wrapping requirement, the sealing requirement is also reduced accordingly, and the construction cost of the cooling system is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic structural diagram of a drive motor cooling system of a cooling system proposed according to an embodiment of the present invention is shown.

[0019] Figure 2 A schematic structural diagram of a generator cooling system of a cooling system proposed according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0021] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for description and distinction purposes, and cannot be understood as indicating or implying the relative importance of the corresponding components.

[0022] The cooling system according to the present invention is integrated in the hybrid transmission for cooling the motor system in the hybrid transmission. A drive motor and a generator are generally installed in the hybrid transmission, and thus the cooling system includes an oil pump, a heat exchanger 100, a drive motor cooling system 200, a generator cooling system 300 and a rear housing oil storage structure 400. The oil pump is Figure 1 and Figure 2 Not shown in Figure 1 and Figure 2 The rear housing 700 of the gearbox is also shown. The oil pump is connected to the heat exchanger 100, and the oil in the gearbox is temperature-controlled through the heat exchanger 100, especially after being cooled by the heat exchanger 100 before entering the gearbox. The oil that has completed the cooling effect eventually circulates back from the rear housing oil storage mechanism 400 to the heat exchanger 100 for cooling again. The oil temperature of the oil entering the gearbox should not be higher than 80°C.

[0023] refer to Figure 1 , which shows a schematic diagram of the structure of a drive motor cooling system 200 of a cooling system proposed according to an embodiment of the present invention. The drive motor cooling system 200 includes a first mechanical gear bearing plate 201, a drive motor oil pipe 202 and a drive motor oil storage tank 203. The first mechanical gear bearing plate 201 is connected to the heat exchanger 100, and the drive motor oil pipe 202 is connected to the first mechanical gear bearing plate 201. When the drive motor needs to be cooled, the oil cooled by the heat exchanger 100 first flows into the first mechanical gear bearing plate 201, and a first valve body unit is constructed in the first mechanical gear bearing plate 201 for distributing the oil to the drive motor oil pipe 202. The first valve body unit includes four solenoid valves, which can determine the oil to be distributed to the drive motor oil pipe 202 according to the working state of the drive motor 500 at this time through the first valve body unit. The amount of oil distributed to the drive motor oil pipe 202 is determined by testing. At the beginning of the test, the amount of oil is distributed according to the theoretical motor heat generation, and then the amount of oil is continuously adjusted according to the actual results of the bench test to achieve the best oil distribution. Three rows of holes are constructed at the end of the drive motor oil pipe 202 near the drive motor winding for oil spraying. The oil is sprayed onto the winding of the drive motor 500 through the holes on the drive motor oil pipe 202 to spray and cool the drive motor winding, and then a part of it falls into the drive motor oil storage tank 203 arranged below the front winding of the drive motor 500, and a part of it falls into the rear housing oil storage mechanism 400 arranged below the rear winding of the drive motor 500 on the gearbox housing, and the oil can be deposited in the drive motor oil storage tank 203 and the rear housing oil storage mechanism 400, and finally a certain height of oil level is maintained to immerse the lower part of the winding of the drive motor 500 in oil, thereby saving oil and improving cooling efficiency.

[0024] refer to Figure 2, which shows a schematic diagram of the structure of a generator cooling system 300 of a cooling system proposed according to an embodiment of the present invention. The invention cooling system 300 includes a second mechanical gear bearing plate 301, a rear housing oil passage 302, a generator oil pipe 303 and a generator oil storage tank 304. The second mechanical gear bearing plate 301 is connected to the heat exchanger 100. When the generator 600 needs to be cooled, the oil cooled by the heat exchanger 100 flows into the second mechanical gear bearing plate 301. A second valve body unit is constructed in the second mechanical gear bearing plate 301 for distributing the oil to the generator oil pipe 303. The second valve body unit includes four solenoid valves, which can determine the oil to be distributed to the generator oil pipe 303 according to the working state of the generator 600 at this time through the second valve body unit. The amount of oil distributed to the generator oil pipe 303 is determined by testing. At the beginning of the test, the amount of oil is distributed according to the theoretical generator heat, and then the amount of oil is continuously adjusted according to the actual results of the bench test to achieve the best oil distribution. Different from the drive motor cooling system 200, the second mechanical gear bearing plate 301 is connected to a rear housing oil passage 302, which is in turn connected to a generator oil pipe 303. After being distributed by the valve unit, the oil first flows to the generator oil pipe 303 via the rear housing oil passage 302. Three rows of holes are configured at the end of the generator oil pipe 303 near the generator winding for spraying the oil. The oil is sprayed onto the winding of the generator 600 through the holes on the generator oil pipe 303 to spray-cool the generator winding, and part of it falls into the generator oil storage tank 304 arranged below the front winding of the generator 600, and part of it falls into the rear housing oil storage mechanism 400 arranged on the gearbox housing below the rear winding of the generator 600. The oil can be deposited in the generator oil storage tank 304 and the rear housing oil storage mechanism 400, and finally maintain a certain oil level to immerse the lower part of the winding of the generator 600 in oil, thereby saving oil and improving cooling efficiency.

[0025] In an embodiment not shown, a nozzle can be configured at the end of the drive motor oil pipe 202 and the generator oil pipe 303 near the drive motor winding and the generator winding instead of the hole arranged at the end of the drive motor oil pipe 202 and the generator oil pipe 303 near the drive motor winding and the generator winding, so as to more accurately control the amount of oil used for spray cooling. The rear housing oil storage structure 400 can also be integrally formed with the rear housing 700 of the hybrid transmission.

[0026] It should be understood that the cooling system according to the present invention can be installed on a hybrid gearbox, and the gearbox of the present invention can be installed on various vehicles, including hybrid vehicles, electric vehicles, etc. Therefore, the subject matter of the present invention is also intended to protect various vehicles equipped with the gearbox of the present invention.

[0027] It should be understood that all the above preferred embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present invention should be within the legal protection scope of the present invention.

Claims

1. A cooling system for cooling a motor system in a hybrid transmission, characterized in that: The cooling system is integrated in the hybrid gearbox, and includes an oil pump, a heat exchanger, a drive motor cooling system, a generator cooling system and a rear housing oil storage structure. The oil pump is connected to the heat exchanger, and the heat exchanger is connected to the drive motor cooling system and the generator cooling system. The rear housing oil storage structure is installed on the rear housing of the gearbox. The drive motor cooling system cools the drive motor in the gearbox by spray cooling and oil immersion cooling at the same time. The generator cooling system cools the generator in the gearbox by spray cooling and oil immersion cooling at the same time. Among them, the drive motor cooling system includes a first mechanical gear bearing plate, a drive motor oil pipe and a drive motor oil storage tank. The first mechanical gear bearing plate is connected to the heat exchanger, and the drive motor oil pipe is connected to the first mechanical gear bearing plate. A first valve body unit is constructed on the first mechanical gear bearing plate for distributing the spray cooling oil to the drive motor oil pipe. A first oil spray structure is constructed on the drive motor oil pipe for spraying oil for cooling. The sprayed oil passes through the drive motor and falls into the drive motor oil storage tank and the rear housing oil storage structure to immerse the drive motor in oil for cooling. The drive motor oil storage tank is arranged below the front winding of the drive motor.

2. The cooling system according to claim 1, characterized in that: The generator cooling system includes a second mechanical gear bearing plate, a rear housing oil channel, a generator oil pipe and a generator oil storage tank. The second mechanical gear bearing plate is connected to the heat exchanger, the rear housing oil channel is connected to the second mechanical gear bearing plate, and the generator oil pipe is connected to the rear housing oil channel. A second valve body unit is constructed on the second mechanical gear bearing plate for distributing the spray cooling oil to the generator oil pipe. A second oil spray structure is constructed on the generator oil pipe for spraying cooling oil. The sprayed oil passes through the generator and falls into the generator oil storage tank and the rear housing oil storage structure to immerse the generator in oil for cooling. The generator oil storage tank is arranged below the front winding of the generator.

3. The cooling system according to claim 2, characterized in that: The first valve body unit and the second valve body unit respectively include four solenoid valves for adjusting the amount of cooling oil.

4. The cooling system according to claim 2, characterized in that: The first and second oil injection structures are respectively configured to be holes opened at the ends of the drive motor oil pipe and the generator oil pipe close to the drive motor winding and the generator winding.

5. The cooling system according to claim 2, characterized in that: The first and second oil injection structures are respectively configured as nozzles installed at the ends of the drive motor oil pipe and the generator oil pipe close to the drive motor winding and the generator winding.

6. The cooling system according to any one of claims 1 to 5, characterized in that: The rear housing oil storage structure is integrally formed with the housing of the hybrid transmission.

7. A gearbox, characterized in that: Comprising a cooling system according to any one of claims 1 to 6.

8. A car, characterized in that: Comprising a gearbox according to claim 7.

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