Cooling device, vehicle driving system and vehicle

Abstract

The utility model relates to the technical field of vehicle engineering, in particular to a cooling device, a vehicle driving system and a vehicle. A return pipeline is arranged between the circulating pump and the cooling cavity; the liquid level sensor is arranged in the cooling cavity; the valve unit is arranged on the backflow pipeline; when a liquid level signal sent by the liquid level sensor indicates that the liquid level in the cooling cavity is lower than a first preset liquid level value, the control valve unit is controlled to be closed so as to increase the cooling oil in the cooling cavity, and when the liquid level signal indicates that the liquid level in the cooling cavity is higher than a second preset liquid level value, the control valve unit is controlled to be opened. The flow and the liquid level of cooling oil in the cooling cavity are accurately controlled, it is ensured that the cooling oil is always kept within the optimal range, enough oil in the cooling cavity is effectively cooled, the motor is prevented from being overheated, the service life of the motor is prolonged, power loss is reduced, and the efficiency and the reliability of the system are improved.

Description

Technical Field

[0001] This application relates to the field of vehicle engineering technology, and in particular to a cooling device, a vehicle drive system, and a vehicle. Background Technology

[0002] With the development of electric and hybrid vehicles, in-wheel motors, which offer higher driving efficiency and more precise control, are attracting increasing attention from researchers.

[0003] As the power of hub motors increases, so does their heat generation, leading to higher temperatures. Excessive heat can reduce the lifespan of the hub motor. Therefore, internal cooling is necessary to keep the temperature within acceptable limits.

[0004] In existing technology, the cooling oil in a hub motor accumulates in the motor housing to cool the motor. However, after a vehicle has been driving on a road with a certain slope for a period of time, due to gravity, the cooling oil will quickly flow from the higher motor side to the lower motor side, resulting in a reduction of cooling oil in the higher motor. This makes it impossible to effectively cool the higher motor, affecting its lifespan. Utility Model Content

[0005] This application provides a cooling device, a vehicle drive system, and a vehicle, which solves the problem of motors located at higher positions not being effectively cooled, leading to a reduction in motor lifespan, by controlling the cooling oil.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] On one hand, this application provides a cooling device for a vehicle drive system, comprising:

[0008] At least two cooling chambers are formed in the corresponding drive motors of the vehicle drive system, and the cooling chambers store cooling oil to cool the corresponding drive motors.

[0009] A circulating pump is provided, with return pipes between the inlet of the circulating pump and the outlets of at least two cooling chambers;

[0010] A liquid level sensor, which corresponds to at least two cooling chambers and is disposed in the corresponding cooling chambers;

[0011] The valve unit corresponds to the liquid level sensor and is located on the corresponding return pipeline;

[0012] When the liquid level signal from the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the corresponding valve unit is controlled to close to increase the cooling oil in the cooling chamber. When the liquid level signal indicates that the liquid level in the cooling chamber is higher than the second preset liquid level value, the corresponding valve unit is controlled to open.

[0013] In one possible implementation, a controller is also included, which is connected to the level sensor and valve unit for control.

[0014] The controller is used to acquire the liquid level signal emitted by the liquid level sensor and compare the liquid level signal with the preset signal value to control the start and stop of the valve unit.

[0015] In one possible implementation, the preset signal value includes a first preset signal value and a second preset signal value, wherein the first preset signal value corresponds to a first preset liquid level value and the second preset signal value corresponds to a second preset liquid level value.

[0016] When the liquid level signal is lower than the first preset signal value, the controller controls the valve unit to close; when the liquid level signal is higher than the second preset signal value, the controller controls the valve unit to open.

[0017] In one possible implementation, the circulation pump includes at least two, with at least two circulation pumps corresponding to the cooling chamber, and a return pipeline is provided between the liquid inlet of the corresponding circulation pump and the liquid outlet of the cooling chamber.

[0018] When the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the corresponding circulation pump speed is increased to increase the amount of cooling oil entering the cooling chamber; and when the liquid level sensor indicates that the liquid level in the cooling chamber is higher than the second preset liquid level value, the corresponding circulation pump speed is restored.

[0019] In one possible implementation, a filter is also included, with its inlet connected to the end of the return line away from the cooling chamber and its outlet connected to the inlet of the circulation pump.

[0020] In one possible implementation, an oil pan is formed below the cooling chamber to store cooling oil. A level sensor is located in the oil pan to sense the height of the cooling oil in the oil pan and thus send a level signal.

[0021] In one possible implementation, the outlet of the cooling chamber is located in the oil pan, and the end of the return pipeline away from the circulation pump is connected to the oil pan.

[0022] In one possible implementation, the outlet of the cooling chamber is located at the bottom of the oil pan.

[0023] In one possible implementation, the oil pan is provided with an oil drain port.

[0024] In one possible implementation, a filter is also included, which is located on the return line and between the cooling chamber and the valve unit.

[0025] In one possible implementation, a heat exchanger is also included, with its inlet connected to the outlet of the circulating pump, and an inlet pipe provided between the outlet of the heat exchanger and the inlet of the cooling chamber.

[0026] In one possible implementation, a cooling oil tank is also included, with the outlet of the heat exchanger connected to the inlet of the cooling oil tank, and the outlet of the cooling oil tank connected to the inlet of the cooling chamber via an inlet pipe.

[0027] In one possible implementation, the liquid inlet of the cooling chamber is located at the top of the cooling chamber.

[0028] In one possible implementation, an inlet oil pump is also included, which is located on the inlet pipeline.

[0029] In one possible implementation, an angle sensor is also included, which is mounted on the frame of the vehicle's drive system, and the controller is connected to the angle sensor.

[0030] In one possible implementation, a temperature sensor is also included, which is located in the cooling chamber, and the controller is connected to the temperature sensor.

[0031] On the other hand, this application provides a cooling device for a vehicle drive system, comprising: a first cooling chamber, the first cooling chamber being formed in a first drive motor of the vehicle drive system, the first cooling chamber storing cooling oil to cool the first drive motor, and a first liquid level sensor being provided in the first cooling chamber;

[0032] The second cooling chamber is formed in the second drive motor on the side of the vehicle drive system opposite to the first drive motor. The second cooling chamber stores cooling oil to cool the second drive motor. The second cooling chamber is equipped with a second liquid level sensor.

[0033] A circulating pump is provided with a first return pipeline between the inlet of the circulating pump and the outlet of the first cooling chamber, and a second return pipeline between the inlet of the circulating pump and the outlet of the second cooling chamber. A first valve unit is provided on the first return pipeline, and a second valve unit is provided on the second return pipeline.

[0034] When the first liquid level signal from the first liquid level sensor indicates that the liquid level in the first cooling chamber is lower than the first preset liquid level value, the first valve unit is controlled to close to increase the cooling oil in the first cooling chamber. When the first liquid level signal indicates that the liquid level in the first cooling chamber is higher than the second preset liquid level value, the first valve unit is controlled to open. When the second liquid level signal from the second liquid level sensor indicates that the liquid level in the second cooling chamber is lower than the first preset liquid level value, the second valve unit is controlled to close to increase the cooling oil in the second cooling chamber. When the second liquid level signal indicates that the liquid level in the second cooling chamber is higher than the second preset liquid level value, the second valve unit is controlled to open.

[0035] On the other hand, this application provides a vehicle drive system, including a power supply and the aforementioned cooling device.

[0036] In another aspect, this application provides a vehicle including the aforementioned vehicle drive system.

[0037] This application provides a cooling device, a vehicle drive system, and a vehicle. By installing a valve unit on the return pipe between the circulating pump and the cooling chamber, and a liquid level sensor in the cooling chamber, when the cooling oil in the cooling chamber decreases, the liquid level sensor detects the drop in the cooling oil level and controls the corresponding valve unit to close. This prevents cooling oil from flowing out of the outlet of the corresponding cooling chamber, while cooling oil continues to flow in from the inlet, increasing the amount of cooling oil in the cooling chamber until the liquid level rises to a certain height. At this point, the corresponding valve unit opens, thereby precisely controlling the flow and level of cooling oil in the cooling chamber. This ensures that the cooling oil is always maintained within the optimal range, providing sufficient oil for effective cooling, preventing motor overheating, extending motor lifespan, reducing power loss, and improving system efficiency and reliability. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is one of the structural schematic diagrams of the cooling device provided in the embodiments of this application;

[0040] Figure 2 for Figure 1 A schematic diagram of the cooling device tilted toward the first drive motor.

[0041] Figure 3 for Figure 1 A schematic diagram of the cooling device tilted toward the second drive motor;

[0042] Figure 4 This is a second schematic diagram of the cooling device provided in the embodiments of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100-Cooling device; 10-Chassis; 20-First drive motor; 21-First cooling chamber; 22-First return pipe; 23-First liquid level sensor; 24-First valve unit; 25-First oil pan; 26-First drain port; 30-Second drive motor; 31-Second cooling chamber; 32-Second return pipe; 33-Second liquid level sensor; 34-Second valve unit; 35-Second oil pan; 36-Second drain port; 40-Circulation pump; 50-Heat exchanger; 51-First inlet pipe; 52-Second inlet pipe; 60-Filter; 70-Cooling oil tank; 81-First inlet oil pump; 82-Second inlet oil pump; 91-Angle sensor; 92-Temperature sensor. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0046] With the development of electric and hybrid vehicles, in-wheel motors, which offer higher driving efficiency and more precise control, are attracting increasing attention from researchers.

[0047] As the power of hub motors increases, so does their heat generation, leading to higher temperatures. Excessive heat can reduce the lifespan of the hub motor. Therefore, internal cooling is necessary to keep the temperature within acceptable limits.

[0048] In existing technology, the cooling oil in a hub motor accumulates in the motor housing to cool the motor. However, after a vehicle has been driving on a road with a certain slope for a period of time, due to gravity, the cooling oil will quickly flow from the higher motor side to the lower motor side, resulting in a reduction of cooling oil in the higher motor. This makes it impossible to effectively cool the higher motor, affecting its lifespan.

[0049] To overcome the shortcomings of the existing technology, after repeated consideration and verification, the inventors discovered that if a valve unit is installed between the drive motor and the oil pump, and a liquid level sensor is installed in the drive motor, the valve unit can be closed when the cooling oil decreases, so that the cooling oil in the corresponding cooling chamber will not flow out from the outlet, but will continue to flow in from the inlet, increasing the amount of cooling oil in the cooling chamber. After the liquid level rises to a certain height, the valve unit will be opened, ensuring that the cooling oil is always kept within the optimal range, so that there is enough oil in the cooling chamber for effective cooling.

[0050] In view of this, this application provides a cooling device for a vehicle drive system, comprising:

[0051] At least two cooling chambers are formed in the corresponding drive motors of the vehicle drive system, and the cooling chambers store cooling oil to cool the corresponding drive motors.

[0052] A circulating pump is provided, with return pipes between the inlet of the circulating pump and the outlets of at least two cooling chambers;

[0053] A liquid level sensor, which corresponds to at least two cooling chambers and is disposed in the corresponding cooling chambers;

[0054] The valve unit corresponds to the liquid level sensor and is located on the corresponding return pipeline;

[0055] When the liquid level signal from the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the corresponding valve unit is controlled to close to increase the cooling oil in the cooling chamber. When the liquid level signal indicates that the liquid level in the cooling chamber is higher than the second preset liquid level value, the corresponding valve unit is controlled to open.

[0056] A valve unit is installed on the return pipeline between the circulating pump and the cooling chamber, and a liquid level sensor is installed in the cooling chamber. When the cooling oil in the cooling chamber decreases, the liquid level sensor detects the drop in the cooling oil level and controls the corresponding valve unit to close. This prevents the cooling oil in the corresponding cooling chamber from flowing out of the outlet, while the cooling oil continues to flow in from the inlet, increasing the amount of cooling oil in the cooling chamber. Until the liquid level rises to a certain height, the corresponding valve unit opens, thus precisely controlling the flow and level of the cooling oil in the cooling chamber. This ensures that the cooling oil is always kept within the optimal range, providing sufficient oil in the cooling chamber for effective cooling, preventing motor overheating, extending motor life, reducing power loss, and improving system efficiency and reliability.

[0057] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0058] Figure 1 This is one of the structural schematic diagrams of the cooling device provided in the embodiments of this application. Figure 2 for Figure 1 The diagram shows a structure in which the cooling device is tilted toward the first drive motor. Figure 3 for Figure 1 The diagram shows a cooling device that is tilted toward the second drive motor. Figure 4 This is a second schematic diagram of the cooling device provided in the embodiments of this application.

[0059] The specific structure of the cooling device and various possible implementation methods are described in detail below.

[0060] like Figure 1 As shown, the cooling device 100 provided in this embodiment is used in a vehicle drive system. The vehicle drive system is mounted on a vehicle. The vehicle drive system includes a frame 10 and at least two drive motors. The drive motors are mounted on the frame.

[0061] The cooling device 100 includes at least two cooling chambers, a liquid level sensor, a valve unit, and a circulation pump 40.

[0062] At least two cooling chambers are formed in the corresponding drive motors of the vehicle drive system. These chambers store cooling oil to cool the respective drive motors. Return lines are provided between the inlet of the circulating pump and the outlets of the at least two cooling chambers. A level sensor corresponds to and is located within each of the at least two cooling chambers. A valve unit, corresponding to the level sensor, is located on the corresponding return line.

[0063] When the liquid level signal from the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the corresponding valve unit is controlled to close to increase the cooling oil in the cooling chamber. When the liquid level signal indicates that the liquid level in the cooling chamber is higher than the second preset liquid level value, the corresponding valve unit is controlled to open.

[0064] The first preset liquid level value is lower than the second preset liquid level value.

[0065] In one possible implementation, a controller is also included, which is connected to the level sensor and valve unit for control.

[0066] The controller is used to acquire the liquid level signal emitted by the liquid level sensor and compare the liquid level signal with the preset signal value to control the start and stop of the valve unit.

[0067] In one possible implementation, the preset signal value includes a first preset signal value and a second preset signal value, wherein the first preset signal value corresponds to a first preset liquid level value and the second preset signal value corresponds to a second preset liquid level value.

[0068] When the liquid level signal is lower than the first preset signal value, the controller controls the valve unit to close; when the liquid level signal is higher than the second preset signal value, the controller controls the valve unit to open.

[0069] In one possible implementation, the circulation pump 40 includes at least two, with at least two circulation pumps 40 corresponding to the cooling chamber, and a return pipeline is provided between the liquid inlet of the corresponding circulation pump 40 and the liquid outlet of the cooling chamber.

[0070] When the liquid level signal from the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the speed of the corresponding circulation pump 40 is increased to increase the amount of cooling oil entering the cooling chamber; and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than the second preset liquid level value, the speed of the corresponding circulation pump 40 is restored.

[0071] In one possible implementation, the drive motor includes a first drive motor 20 and a second drive motor 30.

[0072] The first drive motor 20 is mounted on the frame 10. The second drive motor 30 is mounted on the side of the frame 10 opposite to the first drive motor 20. The circulation pump 40 is connected to both the first drive motor 20 and the second drive motor 30. The heat exchanger 50 is connected to the first drive motor 20, the second drive motor 30, and the circulation pump 40. The circulation pump 40 circulates cooling oil within the device, ensuring that the cooling oil flows between the first drive motor 20, the second drive motor 30, and the heat exchanger 50, effectively removing the heat generated by the first drive motor 20 and the second drive motor 30. The heat exchanger 50 lowers the temperature of the cooling oil; the cooling oil flows within the heat exchanger 50, and the heat in the cooling oil is removed by the flow of air or other heat exchange media. A controller is connected to the circulation pump 40 to control the circulation of the cooling oil.

[0073] The first drive motor 20 is also equipped with a first liquid level sensor 23 and a first valve unit 24. The first drive motor 20 has a first cooling chamber 21. A first return pipe 22 is provided between the inlet of the circulating pump 40 and the outlet of the first cooling chamber 21. The first liquid level sensor 23 is located in the first cooling chamber 21. The first valve unit 24 is located on the first return pipe 22. The first liquid level sensor 23 is used to sense the height of the cooling oil in the first cooling chamber 21, thereby emitting a first liquid level signal.

[0074] The second drive motor 30 is also equipped with a second liquid level sensor 33 and a second valve unit 34. The second drive motor 30 has a second cooling chamber 31. A second return pipe 32 is provided between the inlet of the circulating pump 40 and the outlet of the second cooling chamber 31. The second liquid level sensor 33 is located in the second cooling chamber 31. The second valve unit 34 is located on the second return pipe 42. The second liquid level sensor 33 is used to sense the height of the cooling oil in the second cooling chamber 31, thereby emitting a second liquid level signal.

[0075] The inlet of the heat exchanger 50 is connected to the outlet of the circulating pump 40, and the outlet of the heat exchanger 50 is connected to the inlets of the first cooling chamber 21 and the second cooling chamber 31, respectively.

[0076] The controller is also connected to the first liquid level sensor 23, the second liquid level sensor 33, the first valve unit 24, and the second valve unit 34.

[0077] Please also refer to Figure 3 When the vehicle tilts towards the second drive motor 30, cooling oil flows towards the second drive motor 30 through the pipeline, reducing the amount of cooling oil in the first cooling chamber 21. The controller closes the first valve unit 24 when the first liquid level signal from the first liquid level sensor 23 is lower than a first preset liquid level value, preventing cooling oil from flowing out of the outlet of the first cooling chamber 21 while maintaining the constant flow of cooling oil from the inlet, thus increasing the amount of cooling oil in the first cooling chamber 21 and ensuring sufficient oil for effective cooling. When the increased cooling oil in the first cooling chamber 21 is sufficient, i.e., when the first liquid level signal is higher than a second preset liquid level value, the controller opens the first valve unit 24, allowing the cooling oil in the first cooling chamber 21 to circulate, preventing excessive cooling oil levels in the first cooling chamber 21 from affecting the efficiency of the first drive motor 20.

[0078] Please also refer to Figure 2When the vehicle tilts towards the first drive motor 20, cooling oil flows towards the first drive motor 20 through the pipeline, reducing the amount of cooling oil in the second cooling chamber 31. The controller also controls the second valve unit 34 to close when the second liquid level signal from the second liquid level sensor 33 is lower than the first preset liquid level value, preventing cooling oil from flowing out of the outlet of the second cooling chamber 31 while maintaining the constant flow of cooling oil from the inlet, thus increasing the amount of cooling oil in the second cooling chamber 31 and ensuring sufficient oil for effective cooling. When the amount of cooling oil in the second cooling chamber 31 is sufficient, i.e., when the second liquid level signal is higher than the second preset liquid level value, the controller controls the second valve unit 34 to open, allowing the cooling oil in the second cooling chamber 31 to circulate, preventing excessive cooling oil levels in the second cooling chamber 31 from affecting the efficiency of the second drive motor 30. By monitoring the oil level in the cooling chamber in real time through the first liquid level sensor 23 and the second liquid level sensor 33, the flow and level of the cooling oil in the first cooling chamber 21 and the second cooling chamber 31 are precisely controlled to ensure that the cooling oil in the first drive motor 20 and the second drive motor 30 is always kept within the optimal range. This ensures that the first cooling chamber 21 and the second cooling chamber 31 have enough oil to effectively cool the first drive motor 20 and the second drive motor 30, prevent the motor from overheating, extend the service life of the motor, reduce power loss, and improve the efficiency and reliability of the system.

[0079] In one possible implementation, the circulating pump 40 can be an oil pump or other fluid pump, etc.

[0080] In one possible implementation, the first valve unit 24 and the second valve unit 34 can be solenoid valves, gate valves, ball valves, regulating valves, etc.

[0081] In one possible implementation, the first valve unit 24 and the second valve unit 34 are 2-way solenoid valves or 3-way solenoid valves.

[0082] In one possible implementation, a heat exchanger 50 is also included, the inlet of which is connected to the outlet of the circulating pump 40, and an inlet pipe is provided between the outlet of the heat exchanger 50 and the inlet of the cooling chamber.

[0083] In one possible implementation, a filter 60 is also included, with its inlet connected to the end of the return pipe away from the cooling chamber and its outlet connected to the inlet of the circulation pump 40.

[0084] In one possible implementation, a filter 60 is also included, which is located on the return line and between the cooling chamber and the valve unit.

[0085] In one possible implementation, the cooling device 100 further includes a filter 60, the inlet of which is connected to the end of the first return pipe 22 away from the first cooling chamber 21 and the end of the second return pipe 32 away from the second cooling chamber 31, and the outlet of the filter 60 is connected to the inlet of the circulation pump 40.

[0086] The filter 60 effectively removes impurities, particles, and contaminants from the cooling oil, keeping it clean and reducing wear on the circulation pump 40, first drive motor 20, second drive motor 30, first valve unit 24, and second valve unit 34 in the pipeline. This extends the service life of these components and reduces maintenance and replacement costs. Simultaneously, clean cooling oil has better heat conduction properties, enabling it to absorb and transfer heat more effectively, thereby improving the efficiency of the cooling device 100.

[0087] In one possible implementation, an oil pan is formed below the cooling chamber to store cooling oil. A level sensor is located in the oil pan to sense the height of the cooling oil in the oil pan and thus send a level signal.

[0088] In one possible implementation, a first oil pan 25 is formed below the first cooling chamber 21. The first oil pan 25 is used to store cooling oil. A first liquid level sensor 23 is disposed in the first oil pan 25. The first liquid level sensor 23 is used to sense the height of the cooling oil in the first oil pan 25, thereby emitting a first liquid level signal.

[0089] By setting a first oil sump 25 below the first cooling chamber 21, the cooling oil in the first drive motor 20 can be effectively collected and stored, ensuring that the cooling oil can quickly flow back and be recycled, thus improving the cooling efficiency of the system. The first oil sump 25 can also assist in heat dissipation, helping to reduce the temperature of the oil. A first liquid level sensor 23 is installed in the first oil sump 25 to monitor the liquid level of the cooling oil in real time.

[0090] In one possible implementation, a second oil pan 35 is formed below the second cooling chamber 31. The second oil pan 35 is used to store cooling oil. A second liquid level sensor 33 is disposed in the second oil pan 35. The second liquid level sensor 33 is used to sense the height of the cooling oil in the second oil pan 35, thereby emitting a second liquid level signal.

[0091] Please also refer to Figure 4 In one possible implementation, the first level sensor 23 is mounted on the side of the first oil pan 25 away from the second drive motor 30, thereby increasing the sensitivity to a decrease in the cooling oil in the first oil pan 25.

[0092] In one possible implementation, the second level sensor 33 is mounted on the side of the second oil pan 35 away from the first drive motor 20, thereby increasing the sensitivity to a decrease in cooling oil in the second oil pan 35.

[0093] In one possible implementation, the outlet of the cooling chamber is located in the oil pan, and the end of the return pipeline away from the circulation pump is connected to the oil pan.

[0094] In one possible implementation, the outlet of the first cooling chamber 21 is located in the first oil pan 25, and the end of the first return pipe 22 away from the circulation pump 40 is connected to the first oil pan 25.

[0095] By placing the outlet in the first oil sump 25, the cooling oil is naturally guided back to the first oil sump 25 by gravity, facilitating the return of cooling oil through the first return pipe 22. This allows for faster oil circulation, reducing reliance on the pumping system, improving cooling efficiency, and lowering energy consumption. It also helps reduce the residence time of the cooling oil in the first cooling chamber 21, ensuring rapid oil circulation and preventing localized overheating. Simultaneously, it ensures a stable liquid level in the first oil sump 25, facilitating monitoring and control by the first liquid level sensor 23.

[0096] In one possible implementation, the outlet of the second cooling chamber 31 is located in the second oil pan 35, and the end of the second return pipe 32 away from the circulation pump 40 is connected to the second oil pan 35.

[0097] In one possible implementation, the outlet of the cooling chamber is located at the bottom of the oil pan.

[0098] In one possible implementation, the outlet of the first cooling chamber 21 is located at the bottom of the first oil pan 25.

[0099] By placing the outlet of the first cooling chamber 21 at the bottom of the first oil pan 25, the cooling oil in the first oil pan 25 can be discharged to the maximum extent. This helps prevent oil stagnation and ensures that the oil in the first cooling chamber 21 can circulate fully. At the same time, the bottom of the first oil pan 25 is where impurities and deposits are most likely to accumulate. Placing the outlet of the first cooling chamber 21 at the bottom of the first oil pan 25 helps to carry away these deposits during oil flow, keeping the oil clean and reducing wear on the system.

[0100] In one possible implementation, the outlet of the second cooling chamber 31 is located at the bottom of the second oil pan 35.

[0101] In one possible implementation, the oil pan is provided with an oil drain port.

[0102] In one possible implementation, the first oil pan 25 is provided with a first oil drain port 26.

[0103] The first drain port 26 simplifies and expedites the draining of cooling oil, facilitating regular oil changes and ensuring that the cooling oil in the first cooling chamber 21 remains in optimal condition. The first drain port 26, located in the first oil pan 25, ensures the complete drainage of all oil, including impurities and sediment deposited at the bottom, helping to maintain the cleanliness of the first oil pan 25.

[0104] In one possible implementation, the second oil pan 35 is provided with a second oil drain port 36.

[0105] In one possible implementation, the filter 60 is disposed on the first return pipe 22 and located between the first cooling chamber 21 and the first valve unit 24; and / or the filter 60 is disposed on the second return pipe 32 and located between the second cooling chamber 31 and the second valve unit 34.

[0106] By installing a filter 60 before the first valve unit 24 and the second valve unit 34, impurities and particles in the cooling oil can be effectively removed, preventing these contaminants from entering the first valve unit 24 and the second valve unit 34, reducing the risk of wear and blockage, and thus extending the service life of the first valve unit 24 and the second valve unit 34.

[0107] In one possible implementation, a first inlet pipe 51 is provided between the outlet of the heat exchanger 50 and the inlet of the first cooling chamber 21, and a second inlet pipe 52 is provided between the outlet of the heat exchanger 50 and the inlet of the second cooling chamber 31.

[0108] With independent piping, the cooling oil can be evenly distributed to each cooling chamber, ensuring that each motor receives enough cooling oil, thereby improving cooling efficiency.

[0109] In one possible implementation, a cooling oil tank 70 is also included, with the outlet of the heat exchanger 50 connected to the inlet of the cooling oil tank 70, and the outlet of the cooling oil tank 70 connected to the inlet of the cooling chamber via an inlet pipe.

[0110] In one possible implementation, the cooling device 100 further includes a cooling oil tank 70, the outlet of the heat exchanger 50 is connected to the inlet of the cooling oil tank 70, the outlet of the cooling oil tank 70 is connected to the inlet of the first cooling chamber 21 through a first inlet pipe 51, and the outlet of the cooling oil tank 70 is connected to the inlet of the second cooling chamber 31 through a second inlet pipe 52.

[0111] The cooling oil tank 70 stores and buffers cooling oil, ensuring a stable supply of cooling oil to each cooling chamber and guaranteeing sufficient oil levels under various operating conditions. Simultaneously, the cooling oil tank 70 helps settle and separate air bubbles and impurities from the oil, ensuring purer oil entering the cooling chambers and reducing system wear. Furthermore, the cooling oil tank 70 provides a centralized point for easy oil inspection, replenishment, and replacement, simplifying system maintenance.

[0112] In one possible implementation, an inlet oil pump is also included, which is located on the inlet pipeline.

[0113] In one possible implementation, the cooling device 100 further includes a first inlet oil pump 81 and a second inlet oil pump 82, with the first inlet oil pump 81 located on the first inlet pipe 51 and the second inlet oil pump 82 located on the second inlet pipe 52.

[0114] By equipping each cooling chamber with an independent inlet oil pump, the flow rate of cooling oil entering each chamber can be precisely controlled. It can work in conjunction with level sensors and valve units to adjust the cooling oil supply according to specific cooling needs, thereby improving cooling efficiency. The independent oil pumps can also quickly respond to changes in cooling demand, providing instant flow rate adjustments to ensure stable system operation.

[0115] In one possible implementation, the cooling device 100 also includes an angle sensor 91, which is mounted on the frame 10, and the controller is connected to the angle sensor 91.

[0116] Angle sensor 91 can monitor the vehicle's tilt angle and attitude in real time, which helps to dynamically adjust the operating parameters of cooling device 100. Based on the vehicle's tilt angle, the controller can adjust the flow path or flow rate of cooling oil to ensure that the cooling oil can still circulate effectively under the influence of gravity, thereby maintaining optimal cooling performance.

[0117] In one possible implementation, a temperature sensor 92 is also included, which is located in the cooling chamber, and the controller is connected to the temperature sensor 92.

[0118] In one possible implementation, the cooling device 100 further includes a temperature sensor 92, which is disposed in the first cooling chamber 21 and / or the second cooling chamber 31, and the controller is connected to the temperature sensor 92.

[0119] Temperature sensor 92 can monitor the temperature inside the cooling chamber in real time, providing accurate data to reflect the current cooling status, promptly detecting abnormal temperatures in the drive motor, and preventing overheating. The controller can dynamically adjust operating parameters based on the data provided by temperature sensor 92, such as adjusting the flow rate of cooling oil or activating additional cooling measures to maintain the optimal operating temperature.

[0120] In one possible implementation, the liquid inlet of the cooling chamber is located at the top of the cooling chamber.

[0121] In one possible implementation, the liquid inlet of the first cooling chamber 21 is located at the top of the first cooling chamber 21; and / or the liquid inlet of the second cooling chamber 31 is located at the top of the second cooling chamber 31.

[0122] By placing the inlet at the top of the cooling chamber, the cooling oil can flow naturally downwards under gravity, ensuring that the oil fully covers the entire cooling chamber. This guarantees that all components requiring cooling receive effective cooling, reduces the risk of localized overheating, and improves heat exchange efficiency. Simultaneously, because the oil enters from the top, any air bubbles that may be present in the piping can be more easily expelled from the cooling chamber, reducing their impact on cooling efficiency.

[0123] The cooling device 100 provided in this embodiment includes at least two cooling chambers, a circulating pump 40, a liquid level sensor, and a valve unit. The at least two cooling chambers are respectively formed in the corresponding drive motors of the vehicle drive system. Cooling oil is stored in the cooling chambers to cool the corresponding drive motors. The liquid level sensor corresponds to the at least two cooling chambers and is located in the corresponding cooling chamber. A return pipeline is provided between the liquid inlet of the circulating pump 40 and the liquid outlet of the at least two cooling chambers. The valve unit corresponds to the liquid level sensor and is located in the corresponding return pipeline. When the liquid level signal emitted by the liquid level sensor indicates that the liquid level in the cooling chamber is lower than a first preset liquid level value, the control valve unit closes to increase the cooling oil in the cooling chamber. When the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the control valve unit opens.

[0124] A valve unit is installed on the return pipeline between the circulating pump 40 and the cooling chamber, and a liquid level sensor is installed in the cooling chamber. When the cooling oil in the cooling chamber decreases, the liquid level sensor detects the drop in the cooling oil level and controls the corresponding valve unit to close. This prevents the cooling oil in the corresponding cooling chamber from flowing out of the outlet, while the cooling oil continues to flow in from the inlet, increasing the amount of cooling oil in the cooling chamber until the liquid level rises to a certain height. At this point, the corresponding valve unit opens, thus precisely controlling the flow and level of the cooling oil in the cooling chamber. This ensures that the cooling oil is always kept within the optimal range, providing sufficient oil in the cooling chamber for effective cooling, preventing motor overheating, extending motor life, reducing power loss, and improving system efficiency and reliability.

[0125] On the other hand, this application also provides a vehicle drive system. The vehicle drive system includes a power supply, wheels, and a cooling device 100. The wheels are respectively connected to a first drive motor 20 and a second drive motor 30. The power supply is used to provide power to the first drive motor 20, the second drive motor 30, and the circulation pump 40, etc.

[0126] Given that the vehicle drive system in this embodiment includes the cooling device 100 described in any of the above embodiments, the structural features and beneficial effects of the vehicle drive system including the cooling device 100 will not be elaborated further in this embodiment.

[0127] In another aspect, embodiments of this application also provide a vehicle, including the vehicle drive system described above.

[0128] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0129] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0130] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0131] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cooling device for use in a vehicle drive system, characterized by The application relates to a cooling system of a vehicle driving system. The cooling system comprises: at least two cooling cavities formed in corresponding driving motors of the vehicle driving system, wherein cooling oil is stored in the cooling cavities to cool the corresponding driving motors; a circulating pump (40), wherein a return pipeline is arranged between the liquid inlet of the circulating pump (40) and the liquid outlet of the at least two cooling cavities; a liquid level sensor corresponding to the at least two cooling cavities and arranged in the corresponding cooling cavities; a valve unit corresponding to the liquid level sensor and arranged on the corresponding return pipeline; 2. Cooling device according to claim 1, characterized in that when the liquid level signal sent by the liquid level sensor indicates that the liquid level in the cooling cavity is lower than a first preset liquid level value, the corresponding valve unit is controlled to be closed to increase the cooling oil in the cooling cavity; and when the liquid level signal indicates that the liquid level in the cooling cavity is higher than a second preset liquid level value, the corresponding valve unit is controlled to be opened. The cooling system further comprises a controller connected with the liquid level sensor and the valve unit; 3. Cooling device according to claim 2, characterized in that the controller is used for acquiring the liquid level signal sent by the liquid level sensor and comparing the liquid level signal with a preset signal value to control the opening and closing of the valve unit. The preset signal value comprises a first preset signal value corresponding to the first preset liquid level value and a second preset signal value corresponding to the second preset liquid level value; 4. The cooling device of claim 1, wherein when the liquid level signal is lower than the first preset signal value, the controller controls the valve unit to be closed; and when the liquid level signal is higher than the second preset signal value, the controller controls the valve unit to be opened. The circulating pump (40) comprises at least two circulating pumps (40) corresponding to the cooling cavities, wherein a return pipeline is arranged between the liquid inlet of the corresponding circulating pump (40) and the liquid outlet of the cooling cavity; 5. The cooling device of claim 1, wherein when the liquid level signal sent by the liquid level sensor indicates that the liquid level in the cooling cavity is lower than the first preset liquid level value, the rotating speed of the corresponding circulating pump (40) is controlled to be increased to increase the cooling oil entering the cooling cavity; and when the liquid level signal indicates that the liquid level in the cooling cavity is higher than the second preset liquid level value, the rotating speed of the corresponding circulating pump (40) is controlled to be restored.

6. The cooling device of claim 1, wherein The cooling system further comprises a filter (60), wherein the liquid inlet of the filter (60) is communicated with one end of the return pipeline away from the cooling cavity, and the liquid outlet of the filter (60) is communicated with the liquid inlet of the circulating pump (40).

7. Cooling device according to claim 6, characterized in that An oil sump is formed below the cooling cavities, the oil sump is used for storing cooling oil, the liquid level sensor is arranged in the oil sump, and the liquid level sensor is used for sensing the height of the cooling oil in the oil sump to send the liquid level signal.

8. Cooling device according to claim 7, characterized in that The liquid outlet of the cooling cavity is arranged on the oil sump, and one end of the return pipeline away from the circulating pump is communicated with the oil sump.

9. The cooling device of claim 6, wherein, The liquid outlet of the cooling cavity is arranged on the bottom of the oil sump.

10. The cooling device of claim 1, wherein, The oil sump is provided with a drain port. The cooling system further comprises a filter (60), wherein the filter (60) is arranged on the return pipeline and located between the cooling cavities and the valve unit.

11. The cooling device of claim 1, wherein, Further comprising a heat exchanger (50), a liquid inlet of the heat exchanger (50) being communicated with a liquid outlet of the circulating pump (40), and a liquid inlet of the cooling cavity being communicated with a liquid outlet of the heat exchanger (50) through a liquid inlet pipeline.

12. Cooling device according to claim 11, characterized in that Further comprising a cooling oil tank (70), the liquid outlet of the heat exchanger (50) being communicated with a liquid inlet of the cooling oil tank (70), and the liquid outlet of the cooling oil tank (70) being communicated with the liquid inlet of the cooling cavity through the liquid inlet pipeline.

13. Cooling device according to claim 12, characterized in that The liquid inlet of the cooling cavity is arranged at a top of the cooling cavity.

14. The cooling device of claim 11, wherein, Further comprising a liquid inlet oil pump arranged on the liquid inlet pipeline.

15. The cooling device of claim 2, wherein, Further comprising an angle sensor (91) arranged on a vehicle frame (10) in the vehicle driving system, and the controller being in control connection with the angle sensor (91).

16. The cooling device of claim 2, wherein, Further comprising a temperature sensor (92) arranged in the cooling cavity, and the controller being in control connection with the temperature sensor (92).

17. A cooling device for use in a vehicle drive system, characterized by Comprise: A first cooling cavity (21) formed in a first driving motor (20) in the vehicle driving system, the first cooling cavity (21) storing cooling oil to cool the first driving motor (20), and a first liquid level sensor (23) being arranged in the first cooling cavity (21); A second cooling cavity (31) formed in a second driving motor (30) on a side of the vehicle driving system away from the first driving motor (20), the second cooling cavity (31) storing cooling oil to cool the second driving motor (30), and a second liquid level sensor (33) being arranged in the second cooling cavity (31); A circulating pump (40), a first return pipeline (22) being arranged between a liquid inlet of the circulating pump (40) and a liquid outlet of the first cooling cavity (21), and a second return pipeline (32) being arranged between the liquid inlet of the circulating pump (40) and a liquid outlet of the second cooling cavity (31), a first valve unit (24) being arranged on the first return pipeline (22), and a second valve unit (34) being arranged on the second return pipeline (32); When a first liquid level signal emitted by the first liquid level sensor (23) indicates that a liquid level in the first cooling cavity (21) is lower than a first preset liquid level value, the first valve unit (24) is controlled to be closed to increase the cooling oil in the first cooling cavity (21), and when the first liquid level signal indicates that the liquid level in the first cooling cavity (21) is higher than a second preset liquid level value, the first valve unit (24) is controlled to be opened; when a second liquid level signal emitted by the second liquid level sensor (33) indicates that a liquid level in the second cooling cavity (31) is lower than the first preset liquid level value, the second valve unit (34) is controlled to be closed to increase the cooling oil in the second cooling cavity (31), and when the second liquid level signal indicates that the liquid level in the second cooling cavity (31) is higher than the second preset liquid level value, the second valve unit (34) is controlled to be opened.

18. A vehicle drive system, characterized by, A cooling device as claimed in any one of claims 1-17, including a power source.

19. A vehicle characterized by comprising: A vehicle drive system as claimed in claim 18.

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