Cooling and lubricating system, gearbox and vehicle

Abstract

The application provides a cooling lubrication system, a gearbox and an automobile, and relates to the technical field of a dual-motor hybrid gearbox, and provides a cooling lubrication system for a dual-motor hybrid gearbox comprising a generator and a driving motor, which comprises a duplex pump, a low-pressure oil circuit, a high-pressure oil circuit, a valve plate, a distribution oil circuit, a generator cooling lubrication oil circuit, a driving motor cooling lubrication oil circuit and a clutch cooling lubrication oil circuit, the duplex pump is arranged inside the hybrid gearbox and serves as a power source of the low-pressure oil circuit and the high-pressure oil circuit, the duplex pump draws oil from an oil sump of the hybrid gearbox and delivers the oil into the low-pressure oil circuit and the high-pressure oil circuit, the low-pressure oil circuit is connected to the distribution oil circuit through the valve plate, the high-pressure oil circuit is connected to the generator through the valve plate, and the distribution oil circuit is connected to the generator cooling lubrication oil circuit, the driving motor cooling lubrication oil circuit and the clutch cooling lubrication oil circuit, respectively.

Description

Technical Field

[0001] This invention relates to a cooling and lubrication system, a transmission, and an automobile, and more particularly to a cooling and lubrication system for a dual-motor hybrid transmission including a generator and a drive motor. Background Technology

[0002] With increasingly stringent requirements for vehicle emissions and fuel efficiency, the automotive industry is seeking various energy-saving solutions. Dual-motor hybrid transmissions can reduce fuel consumption by combining timely engine intervention and energy recovery with the high efficiency of the electric motor. For the lubrication and cooling systems of hybrid transmissions, most current technologies employ water cooling for the electric motor and conventional cooling for the transmission interior.

[0003] In the patent for motor oil cooling system (CN06411050A), a single-motor oil cooling method is used to cool the motor in the gearbox. Summary of the Invention

[0004] One aspect of the technical problem to be solved by the present invention is how to adapt the oil cooling of the dual motors in a dual-motor hybrid transmission to meet the special cooling requirements of the dual motors. The driving conditions of a dual-motor hybrid transmission are completely different from those of a car equipped with a single-motor transmission. The dual-motor hybrid transmission has multiple thermal management scenarios, including generator charging, pure electric mode driven by the drive motor, and simultaneous operation of both motors.

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

[0006] This invention provides a cooling and lubrication system, a transmission, and an automobile. Specifically, according to one aspect of the invention, it provides:

[0007] A cooling and lubrication system is provided for a dual-motor hybrid transmission including a generator and a drive motor. The cooling and lubrication system includes a tandem pump, a low-pressure oil circuit, a high-pressure oil circuit, a valve plate, a distribution oil circuit, a generator cooling and lubrication oil circuit, a drive motor cooling and lubrication oil circuit, and a clutch cooling and lubrication oil circuit. The tandem pump is arranged inside the hybrid transmission and serves as the power source for the low-pressure oil circuit and the high-pressure oil circuit. The tandem pump draws oil from the oil pan of the hybrid transmission and delivers it to the low-pressure oil circuit and the high-pressure oil circuit. The low-pressure oil circuit is connected to the distribution oil circuit via a valve plate, and the high-pressure oil circuit is connected to the generator via a valve plate. The distribution oil circuit is connected to the generator cooling and lubrication oil circuit, the drive motor cooling and lubrication oil circuit, and the clutch cooling and lubrication oil circuit, respectively.

[0008] Optionally, according to one embodiment of the invention, an oil with a dynamic viscosity of 0.168 Pa·s at -10°C and a dynamic viscosity of 0.00427 Pa·s at 90°C is used in the cooling and lubrication system.

[0009] Optionally, according to one embodiment of the present invention, a branch oil circuit is constructed in the cooling and lubrication oil circuit of the drive motor for cooling the shifting actuator.

[0010] Optionally, according to one embodiment of the present invention, a valve body is constructed on the valve plate, the valve body being configured such that when it is closed, oil from the high-pressure oil circuit can flow into the generator cooling lubrication oil circuit, and when it is open, oil from the high-pressure oil circuit can flow into the low-pressure oil circuit.

[0011] Optionally, according to one embodiment of the present invention, an oil guide nozzle is constructed at the output shaft of the generator to guide the oil flowing into the generator cooling lubrication oil passage into the shaft hole of the generator output shaft and the bearing, and a hole is constructed on the oil guide nozzle for lubricating the bearing.

[0012] Optionally, according to one embodiment of the present invention, a cooling circuit is constructed on the low-pressure oil circuit for cooling the oil in the low-pressure oil circuit, the cooling circuit including an oil-water heat exchanger, an inverter and a low-temperature cooling circulation radiator connected in sequence.

[0013] Optionally, according to one embodiment of the present invention, the cooling and lubrication system further includes an oil reservoir arranged below the generator and drive motor for storing sprayed cooling oil and for immersing the generator and drive motor in oil for lubrication.

[0014] Optionally, according to one embodiment of the present invention, the cooling and lubrication system further includes an oil guide groove, which is arranged above the main reduction gear of the hybrid transmission. The oil guide groove collects the oil stirred up by the main reduction gear of the hybrid transmission and guides it into an oil reservoir.

[0015] According to another aspect of the present invention, a gearbox is provided, wherein the gearbox includes the cooling and lubrication system described above.

[0016] According to another aspect of the present invention, an automobile is provided, wherein the automobile includes the transmission described above.

[0017] The advantages of this invention include: the cooling and lubrication system according to this invention can independently control the cooling of the two motors in a hybrid transmission, and can cool and lubricate the rotors, support bearings, and other components of the motors. Branch lines can be added to the cooling and lubrication system to cool and lubricate other parts requiring cooling. The flow rate in the oil circuit can be adjusted according to operating conditions, and the flow rate can also be controlled by the valve body in the valve plate to adjust the workload of the oil pump in a timely manner, thereby improving the efficiency of the transmission. The motor stator is cooled by spray cooling using spray oil pipes. The spray oil pipes have a large inner diameter and multiple spray holes, resulting in a small pressure drop in the system and reducing the energy consumption of the oil pump. Attached Figure Description

[0018] Referring to the accompanying drawings, the above and other features of the present invention will become apparent, wherein,

[0019] Figure 1 A schematic diagram of a cooling and lubrication system according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the structure of a dual pump in a cooling and lubrication system according to an embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of the flow distribution during cooling is shown in a cooling and lubrication system according to an embodiment of the present invention. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0023] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0024] refer to Figure 1This diagram illustrates a structural schematic of a cooling and lubrication system according to an embodiment of the present invention. The system is used in a dual-motor hybrid gearbox comprising a generator and a drive motor. The system includes a dual pump 1, a low-pressure oil circuit 2, a high-pressure oil circuit 3, a valve plate 4, a distribution oil circuit 5, a generator cooling and lubrication oil circuit 6, a drive motor cooling and lubrication oil circuit 7, and a clutch cooling and lubrication oil circuit 8. (Reference) Figure 2 This diagram illustrates the structure of a dual-pump cooling and lubrication system according to an embodiment of the present invention. The dual-pump 1 includes a pump body 101, an oil pump motor 102, and an oil pump controller 103. The dual-pump 1 is driven by the oil pump motor 102, which is controlled by the oil pump controller 103. The pump body of the dual-pump 1 is divided into two chambers, which output low-pressure oil and high-pressure oil at different pressures, respectively, for the low-pressure oil circuit 2 and the high-pressure oil circuit 3. The dual-pump 1 is integrated into the gearbox, and its oil pump motor 102 is splash-cooled by the reduction gears in the gearbox. Because the dual-pump 1 is covered by the gearbox housing and lubricated by gearbox lubricating oil, better NVH performance can be achieved. Compared to the dual-pump 1, the real-time displacement of a mechanical pump is strongly correlated with vehicle speed; the flow rate is large at high speeds and small at low speeds. The dual-pump 1, however, can adjust the displacement as needed when the vehicle is running at low speeds and can ensure the high pressure of the high-pressure oil circuit 3.

[0025] The oil used in the cooling and lubrication system according to one embodiment of the present invention is an oil with a dynamic viscosity of 0.168 Pa·s at -10°C and a dynamic viscosity of 0.00427 Pa·s at 90°C.

[0026] Low-pressure oil circuit 2 and high-pressure oil circuit 3 are connected to valve plate 4. Valve plate 4 has a valve body and a structure for guiding the oil circuits. Through this structure, high-pressure oil circuit 3 is connected to generator 100 and low-pressure oil circuit 2 via valve plate 4. Low-pressure oil circuit 2 is connected to distribution oil circuit 5 via valve plate 4. Distribution oil circuit 5 is connected to generator cooling and lubrication oil circuit 6, drive motor cooling and lubrication oil circuit 7, and clutch cooling and lubrication oil circuit 8, respectively. High-pressure oil circuit 3 is generally used for gear shifting of clutch 300. When the valve body on valve plate 4 is closed, excess high-pressure oil from gear shifting can flow through valve plate 4 into generator cooling and lubrication oil circuit 6. When the valve body is open, excess high-pressure oil from gear shifting can flow through valve plate 4 into low-pressure oil circuit 2. Low-pressure oil from low-pressure oil circuit 2 can be used for cooling and lubrication of generator 100, motor 200, and clutch 300 via valve plate 4, i.e., flowing into generator cooling and lubrication oil circuit 6, drive motor cooling and lubrication oil circuit 7, and clutch cooling and lubrication oil circuit 8, respectively. In another embodiment of the invention, the valve plate 4 may also be without a valve body, in which case the generator 100 is always lubricated by a combination of high-pressure oil and low-pressure oil. Furthermore, an oil guide nozzle is constructed at the output shaft of the generator 100 to guide the oil flowing from the generator cooling lubrication oil passage 6 into the shaft bore of the generator 100 and the bearings. The oil guide nozzle has holes for lubricating the bearings as needed, and a high-speed sealing ring is installed on the oil guide nozzle to maintain oil pressure.

[0027] The generator cooling and lubrication oil circuit 6 cools and lubricates the generator 100. First, the generator stator is cooled by spraying oil from above through oil pipes. The oil pipes used for spraying cooling have a large diameter and multiple spray holes to reduce the system pressure drop. Then, the oil reaches the generator rotor and the support bearings of the generator 100 through the integrated oil circuit in the gearbox housing, where it is cooled and lubricated. The oil used to cool the generator stator finally falls into the oil reservoir 400 located below the generator 100, at which point the stator windings of the generator 100 are also immersed in oil for lubrication.

[0028] The drive motor cooling and lubrication oil circuit 7 cools and lubricates the drive motor 200. First, the drive motor stator is sprayed with oil from above through oil pipes for cooling. Then, the oil flows through the integrated oil circuit of the gearbox housing to the drive motor rotor and the support bearings of the drive motor 200, where it is cooled and lubricated. The oil used to cool the drive motor stator finally falls into the oil reservoir 400 located below the drive motor 200, thus providing oil immersion lubrication for the stator. Branch oil circuits can be constructed within the drive motor cooling and lubrication oil circuit 7 to cool the gearbox's shift actuators.

[0029] The transmission also includes an oil guide groove positioned above the main reduction gear. This groove is configured to guide oil from areas with higher oil levels (i.e., rich oil zones) to areas with lower oil levels (i.e., lean oil zones). The oil guide groove collects oil splashed from the main reduction gear and directs it into an oil reservoir 400 located below the generator 100 and drive motor 200.

[0030] refer to Figure 3 This diagram illustrates the flow distribution of a cooling and lubrication system according to an embodiment of the present invention.

[0031] First, the dual pump 1 draws transmission fluid from the oil pan and delivers it to the high-pressure oil circuit 3 and the low-pressure oil circuit 2 respectively. The fluid in the low-pressure oil circuit 2 is first filtered by the fine filter 9, and then cooled by the cooling circuit 10. The cooling circuit 10 includes an oil-water heat exchanger (SPHE) 11, an inverter (TPIM) 12, and a low-temperature cooling circulating radiator (LTR) 13 connected in sequence. The low-pressure fluid is cooled by the oil-water heat exchanger 11 in the cooling circuit 10, while the water heated by the cooling fluid in the oil-water heat exchanger 11 is cooled by the inverter 12 and the low-temperature cooling circulating radiator 13. The high-pressure oil circuit 3 and the low-pressure oil circuit 2 are connected to the valve plate 4. The high-pressure oil circuit 3 is connected to the generator cooling lubrication oil circuit 6 through the valve plate 4. The low-pressure oil circuit 2 is connected to the distribution oil circuit 5 through the valve plate 4. The distribution oil circuit 5 is connected to the generator cooling lubrication oil circuit 6, the drive motor cooling lubrication oil circuit 7, and the clutch cooling lubrication oil circuit 8, respectively. Therefore, the oil used to cool and lubricate the generator 100 can include both high-pressure and low-pressure oil, while the oil used to lubricate the drive motor 200 and clutch 300 contains only low-pressure oil. A valve body is constructed in the valve plate 4, and the valve body is controlled by the transmission controller (HTCP). When the valve body is closed, the connection between the low-pressure oil circuit 2 and the generator cooling and lubrication oil circuit 6 is interrupted, and the generator 100 is cooled and lubricated only by high-pressure oil. When the valve body is open, the generator 100 is cooled and lubricated by both high-pressure and low-pressure oil simultaneously.

[0032] It should be understood that the cooling and lubrication system and transmission of the present invention can be installed in various vehicles, including passenger cars, trucks, buses, hybrid vehicles, etc. Therefore, the subject matter of the present invention also aims to protect various vehicles equipped with the cooling and lubrication system and transmission of the present invention.

[0033] It should be understood that all the above preferred embodiments are exemplary and not 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 and lubrication system, characterized in that, The cooling and lubrication system is used in a dual-motor hybrid transmission including a generator and a drive motor. The cooling and lubrication system includes a tandem pump, a low-pressure oil circuit, a high-pressure oil circuit, a valve plate, a distribution oil circuit, a generator cooling and lubrication oil circuit, a drive motor cooling and lubrication oil circuit, and a clutch cooling and lubrication oil circuit. The tandem pump is arranged inside the hybrid transmission and serves as the power source for the low-pressure oil circuit and the high-pressure oil circuit. The tandem pump draws oil from the oil pan of the hybrid transmission and delivers it to the low-pressure oil circuit and the high-pressure oil circuit. The low-pressure oil circuit is connected to the distribution oil circuit through the valve plate, and the high-pressure oil circuit is connected to the generator through the valve plate. The distribution oil circuit is connected to the generator cooling and lubrication oil circuit, the drive motor cooling and lubrication oil circuit, and the clutch cooling and lubrication oil circuit, respectively.

2. The cooling and lubrication system according to claim 1, characterized in that, The cooling and lubrication system uses an oil with a dynamic viscosity of 0.168 Pa·s at -10°C and a dynamic viscosity of 0.00427 Pa·s at 90°C.

3. The cooling and lubrication system according to claim 1, characterized in that, A valve body is constructed on the valve plate, the valve body being configured such that when it is closed, oil from the high-pressure oil circuit can flow into the generator cooling lubrication oil circuit, and when it is open, oil from the high-pressure oil circuit can flow into the low-pressure oil circuit.

4. The cooling and lubrication system according to claim 1, characterized in that, An oil guide nozzle is constructed at the output shaft of the generator to guide the oil flowing from the generator cooling and lubrication oil circuit into the shaft hole of the generator output shaft and the bearing. The oil guide nozzle has holes for lubricating the bearing.

5. The cooling and lubrication system according to claim 1, characterized in that, A cooling circuit is constructed on the low-pressure oil line to cool the oil in the low-pressure oil line. The cooling circuit includes an oil-water heat exchanger, an inverter, and a low-temperature cooling circulation radiator connected in sequence.

6. The cooling and lubrication system according to claim 1, characterized in that, The cooling and lubrication system also includes an oil reservoir, which is arranged below the generator and drive motor to store sprayed cooling oil and to immerse the generator and drive motor in oil for lubrication.

7. The cooling and lubrication system according to claim 6, characterized in that, The cooling and lubrication system also includes an oil guide groove, which is arranged above the main reduction gear of the hybrid transmission. The oil guide groove collects the oil stirred up by the main reduction gear of the hybrid transmission and guides it into an oil reservoir.

8. A gearbox, characterized in that, Includes the cooling and lubrication system according to any one of claims 1 to 7.

9. A car, characterized in that, Including the gearbox as described in claim 8.

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