Cooling device, vehicle driving system and vehicle

Abstract

The invention 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] The present application relates to the field of vehicle engineering technology, and in particular to a cooling device, a vehicle drive system and a vehicle. Background Art

[0002] With the development of electric vehicles and hybrid vehicles, wheel hub motors with higher driving efficiency and more precise control have attracted the attention of more and more researchers.

[0003] As the power of the hub motor increases, the heat generated by the hub motor also increases, causing the temperature of the hub motor to rise. Excessive temperature will reduce the life of the hub motor. Therefore, it is necessary to cool the inside of the hub motor to keep the temperature of the hub motor within the allowable range.

[0004] In the prior art, the cooling oil of the wheel hub motor is collected in the motor's shaft housing to cool the motor. However, when the vehicle runs on a road with a certain slope for a period of time, due to the effect of gravity, the cooling oil will quickly flow from the higher motor side to the lower motor side, resulting in a reduction in the cooling oil in the higher motor, so that the higher motor cannot be effectively cooled, which affects the life of the motor. Summary of the invention

[0005] The present application provides a cooling device, a vehicle drive system and a vehicle, which solve the problem that a motor located at a higher position cannot be effectively cooled, resulting in a reduced life of the motor, by controlling the cooling oil.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] In one aspect, the present application provides a cooling device for use in a vehicle drive system, comprising:

[0008] At least two cooling chambers, the at least two cooling chambers are respectively formed in corresponding drive motors in the vehicle drive system, and cooling oil is stored in the cooling chambers to cool the corresponding drive motors;

[0009] A circulating pump, wherein a reflux pipeline is provided between a liquid inlet of the circulating pump and liquid outlets of at least two cooling chambers;

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

[0011] A valve unit, the valve unit corresponds to the liquid level sensor and is arranged on a corresponding return pipeline;

[0012] 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 corresponding valve unit is controlled to be closed to increase the cooling oil in the cooling chamber, and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the corresponding valve unit is controlled to be opened.

[0013] In a possible implementation, it also includes a controller, which is control-connected to the liquid level sensor and the valve unit;

[0014] The controller is used to obtain the liquid level signal sent 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 a possible implementation, the preset signal value includes a first preset signal value and a second preset signal value, the first preset signal value corresponds to the first preset liquid level value, and the second preset signal value corresponds to the 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 a possible implementation, the circulation pumps include at least two, the at least two circulation pumps correspond to the cooling chambers, and a reflux 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 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 speed of the corresponding circulating pump is controlled to increase so as to increase the cooling oil entering the cooling chamber; and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the speed of the corresponding circulating pump is controlled to resume.

[0019] In a possible implementation, a filter is further included, wherein a liquid inlet of the filter is connected to an end of the reflux pipeline away from the cooling chamber, and a liquid outlet of the filter is connected to a liquid inlet of a circulation pump.

[0020] In a possible implementation, an oil pan is formed below the cooling cavity, the oil pan is used to store cooling oil, a liquid level sensor is disposed in the oil pan, and the liquid level sensor is used to sense the height of the cooling oil in the oil pan, thereby sending a liquid level signal.

[0021] In a possible implementation, the liquid outlet of the cooling chamber is arranged on the oil pan, and one end of the return pipe away from the circulation pump is connected to the oil pan.

[0022] In a possible implementation, the liquid outlet of the cooling chamber is arranged at the bottom of the oil pan.

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

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

[0025] In a possible implementation, a heat exchanger is further included, wherein a liquid inlet of the heat exchanger is connected to a liquid outlet of the circulation pump, and a liquid inlet pipeline is provided between the liquid outlet of the heat exchanger and the liquid inlet of the cooling chamber.

[0026] In a possible implementation, a cooling oil tank is further included, the liquid outlet of the heat exchanger is connected to the liquid inlet of the cooling oil tank, and the liquid outlet of the cooling oil tank is connected to the liquid inlet of the cooling chamber through a liquid inlet pipeline.

[0027] In a possible implementation, the liquid inlet of the cooling cavity is arranged at the top of the cooling cavity.

[0028] In a possible implementation, it also includes a liquid inlet oil pump, which is arranged on the liquid inlet pipeline.

[0029] In a possible implementation, an angle sensor is further included. The angle sensor is arranged on a frame in the vehicle drive system, and the controller is control-connected to the angle sensor.

[0030] In a possible implementation, a temperature sensor is further included. The temperature sensor is disposed in the cooling chamber, and the controller is controllably connected to the temperature sensor.

[0031] On the other hand, the present application provides a cooling device for use in a vehicle drive system, comprising: a first cooling cavity, the first cooling cavity is formed in a first drive motor in the vehicle drive system, cooling oil is stored in the first cooling cavity to cool the first drive motor, and a first liquid level sensor is provided in the first cooling cavity;

[0032] A second cooling chamber, the second cooling chamber is formed in the second drive motor on the side of the vehicle drive system away from the first drive motor, the second cooling chamber stores cooling oil to cool the second drive motor, and the second cooling chamber is provided with a second liquid level sensor;

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

[0034] When a first liquid level signal emitted by the first liquid level sensor indicates that the liquid level in the first cooling chamber is lower than a first preset liquid level value, the first valve unit is controlled to be closed to increase the cooling oil in the first cooling chamber, and when the first liquid level signal indicates that the liquid level in the first cooling chamber is higher than a second preset liquid level value, the first valve unit is controlled to be opened; when a second liquid level signal emitted by 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 be closed to increase the cooling oil in the second cooling chamber, and 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 be opened.

[0035] On the other hand, the present application provides a vehicle driving system, including a power source and the above-mentioned cooling device.

[0036] On the other hand, the present application provides a vehicle, comprising the above-mentioned vehicle drive system.

[0037] The present application provides a cooling device, a vehicle drive system and a vehicle. A valve unit is provided on the return line between the circulating pump and the cooling chamber, and a liquid level sensor is provided in the cooling chamber. When the cooling oil in the cooling chamber decreases, the liquid level sensor provided therein senses that the liquid level of the cooling oil has decreased, and controls the corresponding valve unit to close, so that the cooling oil in the corresponding cooling chamber will not flow out from the liquid outlet, while the cooling oil will continue to flow in from the liquid inlet, so that the cooling oil in the cooling chamber increases until the liquid level rises to a certain height, and the corresponding valve unit opens, thereby accurately controlling the flow and liquid level of the cooling oil in the cooling chamber, 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, preventing the motor from overheating, extending the service life of the motor, reducing power loss, and improving the efficiency and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 One of the structural schematic diagrams of the cooling device provided in the embodiment of the present application;

[0040] Figure 2 for Figure 1 A schematic structural diagram showing that the cooling device is tilted toward one side of the first drive motor;

[0041] Figure 3 for Figure 1 A schematic structural diagram showing that the cooling device is tilted toward the second drive motor side;

[0042] Figure 4 This is a second schematic diagram of the structure of the cooling device provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 100-cooling device; 10-frame; 20-first drive motor; 21-first cooling chamber; 22-first return line; 23-first liquid level sensor; 24-first valve unit; 25-first oil pan; 26-first oil drain port; 30-second drive motor; 31-second cooling chamber; 32-second return line; 33-second liquid level sensor; 34-second valve unit; 35-second oil pan; 36-second oil drain port; 40-circulating pump; 50-heat exchanger; 51-first liquid inlet line; 52-second liquid inlet line; 60-filter; 70-cooling oil tank; 81-first liquid inlet oil pump; 82-second liquid inlet oil pump; 91-angle sensor; 92-temperature sensor. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] With the development of electric vehicles and hybrid vehicles, wheel hub motors with higher driving efficiency and more precise control have attracted the attention of more and more researchers.

[0047] As the power of the hub motor increases, the heat generated by the hub motor also increases, causing the temperature of the hub motor to rise. Excessive temperature will reduce the life of the hub motor. Therefore, it is necessary to cool the inside of the hub motor to keep the temperature of the hub motor within the allowable range.

[0048] In the prior art, the cooling oil of the wheel hub motor is collected in the motor's shaft housing to cool the motor. However, when the vehicle runs on a road with a certain slope for a period of time, due to the effect of gravity, the cooling oil will quickly flow from the higher motor side to the lower motor side, resulting in a reduction in the cooling oil in the higher motor, so that the higher motor cannot be effectively cooled, which affects the life of the motor.

[0049] In order to overcome the defects in the prior art, after repeated thinking and verification, the inventors found that if a valve unit is arranged between the drive motor and the oil pump, and a liquid level sensor is arranged in the drive motor, the valve unit can be closed when the cooling oil is reduced, so that the cooling oil in the corresponding cooling chamber will not flow out from the liquid outlet, and the cooling oil will continue to flow in from the liquid inlet, so that the cooling oil in the cooling chamber increases, and after the liquid level rises to a certain height, the valve unit is opened to ensure 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, the present application provides a cooling device for use in a vehicle drive system, comprising:

[0051] At least two cooling chambers, the at least two cooling chambers are respectively formed in corresponding drive motors in the vehicle drive system, and cooling oil is stored in the cooling chambers to cool the corresponding drive motors;

[0052] A circulating pump, wherein a reflux pipeline is provided between a liquid inlet of the circulating pump and liquid outlets of at least two cooling chambers;

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

[0054] A valve unit, the valve unit corresponds to the liquid level sensor and is arranged on a corresponding return pipeline;

[0055] 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 corresponding valve unit is controlled to be closed to increase the cooling oil in the cooling chamber, and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the corresponding valve unit is controlled to be opened.

[0056] By setting a valve unit on the return pipeline between the circulation pump and the cooling chamber, and setting a liquid level sensor in the cooling chamber. When the cooling oil in the cooling chamber decreases, the liquid level sensor therein senses the decrease in the liquid level of the cooling oil, and controls the corresponding valve unit to close, so that the cooling oil in the corresponding cooling chamber will not flow out from the liquid outlet, but the cooling oil will continue to flow in from the liquid inlet, so that the cooling oil in the cooling chamber increases until the liquid level rises to a certain height, and the corresponding valve unit opens, thereby accurately controlling the flow and liquid level of the cooling oil in the cooling chamber, 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, preventing the motor from overheating, extending the service life of the motor, reducing power loss, and improving the efficiency and reliability of the system.

[0057] The contents of the present application will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present application more clearly and in detail.

[0058] Figure 1 This is one of the structural schematic diagrams of the cooling device provided in the embodiment of the present application. Figure 2 for Figure 1 A schematic structural diagram of the cooling device shown is tilted toward the first drive motor. Figure 3 for Figure 1 A schematic structural diagram of the cooling device shown is inclined toward the second drive motor. Figure 4 This is a second schematic diagram of the structure of the cooling device provided in an embodiment of the present application.

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

[0060] like Figure 1 As shown, the cooling device 100 provided in the embodiment of the present application is used in a vehicle drive system. The vehicle drive system is arranged 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 in the vehicle drive system, and cooling oil is stored in the cooling chambers to cool the corresponding drive motors. Return pipes are respectively arranged between the liquid inlet of the circulation pump and the liquid outlets of the at least two cooling chambers. The liquid level sensor corresponds to the at least two cooling chambers and is arranged in the corresponding cooling chamber. The valve unit corresponds to the liquid level sensor and is arranged on the corresponding return pipe.

[0063] 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 corresponding valve unit is controlled to be closed to increase the cooling oil in the cooling chamber, and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the corresponding valve unit is controlled to be opened.

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

[0065] In a possible implementation, it also includes a controller, which is control-connected to the liquid level sensor and the valve unit;

[0066] The controller is used to obtain the liquid level signal sent 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 a possible implementation, the preset signal value includes a first preset signal value and a second preset signal value, the first preset signal value corresponds to the first preset liquid level value, and the second preset signal value corresponds to the 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 a possible implementation, the circulation pump 40 includes at least two, at least two circulation pumps 40 correspond to the cooling chamber, and a reflux 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 emitted by 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 circulating pump 40 is controlled to increase so as to increase the 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 circulating pump 40 is controlled to resume.

[0071] In a 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 away from the first drive motor 20. The circulation pump 40 is connected to 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 is used to circulate cooling oil in the device, so that the cooling oil flows between the first drive motor 20, the second drive motor 30 and the heat exchanger 50, ensuring that the cooling oil can effectively take away the heat generated by the first drive motor 20 and the second drive motor 30. The heat exchanger 50 is used to reduce the temperature of the cooling oil. The cooling oil flows in the heat exchanger 50 and takes away the heat in the cooling oil through the flow of air or other heat exchange medium. The controller is connected to the circulation pump 40 to control the circulation pump 40 to circulate the cooling oil.

[0073] The first drive motor 20 is also provided 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 reflux pipeline 22 is provided between the liquid inlet of the circulation pump 40 and the liquid outlet of the first cooling chamber 21. The first liquid level sensor 23 is provided in the first cooling chamber 21. The first valve unit 24 is provided on the first reflux pipeline 22. The first liquid level sensor 23 is used to sense the height of the cooling oil in the first cooling chamber 21, thereby sending a first liquid level signal.

[0074] The second drive motor 30 is also provided 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 reflux pipeline 32 is provided between the liquid inlet of the circulation pump 40 and the liquid outlet of the second cooling chamber 31. The second liquid level sensor 33 is provided in the second cooling chamber 31. The second valve unit 34 is provided on the second reflux pipeline 42. The second liquid level sensor 33 is used to sense the height of the cooling oil in the second cooling chamber 31, thereby sending a second liquid level signal.

[0075] The liquid inlet of the heat exchanger 50 is communicated with the liquid outlet of the circulation pump 40 , and the liquid outlet of the heat exchanger 50 is communicated with the liquid 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 see Figure 3 When the vehicle tilts toward the second drive motor 30, the cooling oil flows toward the second drive motor 30 through the pipeline, so that the cooling oil in the first cooling chamber 21 is reduced. The controller is used to control the first valve unit 24 to close when the first liquid level signal sent by the first liquid level sensor 23 is lower than the first preset liquid level value, so that the cooling oil in the first cooling chamber 21 will not flow out from the liquid outlet, and the cooling oil flowing in from the liquid inlet remains unchanged, and the cooling oil in the first cooling chamber 21 is increased to ensure that there is enough oil in the first cooling chamber 21 for effective cooling. When the cooling oil added to the first cooling chamber 21 is sufficient, that is, when the first liquid level signal is higher than the second preset liquid level value, the first valve unit 24 is controlled to open, so that the cooling oil in the first cooling chamber 21 circulates, and prevents the cooling oil in the first cooling chamber 21 from being too high, which affects the efficiency of the first drive motor 20.

[0078] Please also see Figure 2When the vehicle tilts toward the first drive motor 20, the cooling oil flows toward the first drive motor 20 through the pipeline, so that the cooling oil in the second cooling chamber 31 is reduced. The controller is also used to control the second valve unit 34 to close when the second liquid level signal sent by the second liquid level sensor 33 is lower than the first preset liquid level value, so that the cooling oil in the second cooling chamber 31 will not flow out from the liquid outlet, and the cooling oil flowing in from the liquid inlet remains unchanged, and the cooling oil in the second cooling chamber 31 is increased to ensure that there is enough oil in the second cooling chamber 31 for effective cooling. When the cooling oil added to the second cooling chamber 31 is sufficient, that is, when the second liquid level signal is higher than the second preset liquid level value, the second valve unit 34 is controlled to open, so that the cooling oil in the second cooling chamber 31 circulates, and prevents the cooling oil in the second cooling chamber 31 from being too high, which affects the efficiency of the second drive motor 30. The first liquid level sensor 23 and the second liquid level sensor 33 monitor the oil level in the cooling chamber in real time, and accurately control the flow and liquid level of the cooling oil in the first cooling chamber 21 and the second cooling chamber 31, 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, so 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 a possible implementation, the circulation pump 40 may be an oil pump or other fluid pumps.

[0080] In a possible implementation, the first valve unit 24 and the second valve unit 34 may be solenoid valves, stop valves, ball valves, regulating valves, etc.

[0081] In a 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 a possible implementation, a heat exchanger 50 is further included, the liquid inlet of the heat exchanger 50 is connected to the liquid outlet of the circulation pump 40, and a liquid inlet pipeline is provided between the liquid outlet of the heat exchanger 50 and the liquid inlet of the cooling chamber.

[0083] In a possible implementation, a filter 60 is further included, wherein a liquid inlet of the filter 60 is communicated with an end of the reflux pipeline away from the cooling chamber, and a liquid outlet of the filter 60 is communicated with a liquid inlet of the circulation pump 40 .

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

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

[0086] The filter 60 can effectively remove impurities, particles and pollutants in the cooling oil, keep the cooling oil clean, reduce the wear of the circulation pump 40, the first drive motor 20, the second drive motor 30, the first valve unit 24 and the second valve unit 34 in the pipeline, thereby extending the service life of these components and reducing maintenance and replacement costs. At the same time, clean cooling oil has better thermal conductivity and can absorb and transfer heat more effectively, thereby improving the efficiency of the cooling device 100.

[0087] In a possible implementation, an oil pan is formed below the cooling cavity, the oil pan is used to store cooling oil, a liquid level sensor is disposed in the oil pan, and the liquid level sensor is used to sense the height of the cooling oil in the oil pan, thereby sending a liquid 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, and the first liquid level sensor 23 is used to sense the height of the cooling oil in the first oil pan 25, thereby issuing a first liquid level signal.

[0089] By arranging the first oil pan 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 again, thereby improving the cooling efficiency of the system. The first oil pan 25 can also assist in heat dissipation and help reduce the temperature of the oil. The first liquid level sensor 23 is installed in the first oil pan 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, and the second liquid level sensor 33 is used to sense the height of the cooling oil in the second oil pan 35, thereby issuing a second liquid level signal.

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

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

[0093] In a possible implementation, the liquid outlet of the cooling chamber is arranged on the oil pan, and one end of the return pipe away from the circulation pump is connected to the oil pan.

[0094] In a possible implementation, the liquid outlet of the first cooling chamber 21 is disposed at the first oil sump 25 , and one end of the first reflux pipeline 22 away from the circulation pump 40 is in communication with the first oil sump 25 .

[0095] By setting the liquid outlet in the first oil pan 25, the cooling oil is naturally guided back to the first oil pan 25 by gravity, so that the first return line 22 can return and absorb the cooling oil, and the circulation of the cooling oil can be completed more quickly, which reduces the dependence on the pumping system, improves the cooling efficiency, and reduces energy consumption. It also helps to reduce the retention time of the cooling oil in the first cooling chamber 21, ensures the rapid circulation of the oil, and prevents local overheating. At the same time, it can also ensure that the liquid level in the first oil pan 25 is stable, which is convenient for the monitoring and control of the first liquid level sensor 23.

[0096] In a possible implementation, the liquid outlet of the second cooling chamber 31 is disposed at the second oil sump 35 , and one end of the second return line 32 away from the circulation pump 40 is in communication with the second oil sump 35 .

[0097] In a possible implementation, the liquid outlet of the cooling chamber is arranged at the bottom of the oil pan.

[0098] In a possible implementation, the liquid outlet of the first cooling chamber 21 is disposed at the bottom of the first oil sump 25 .

[0099] By arranging the liquid outlet of the first cooling chamber 21 at the bottom of the first oil pan 25, it is ensured that the cooling oil in the first oil pan 25 can be discharged to the maximum extent. This helps to prevent oil retention and ensure that the oil in the first cooling chamber 21 can be fully circulated. At the same time, the bottom of the first oil pan 25 is where impurities and sediments are most likely to accumulate. Arranging the liquid outlet of the first cooling chamber 21 at the bottom of the first oil pan 25 helps to take away these sediments during the flow of oil, keep the oil clean, and reduce wear on the system.

[0100] In a possible implementation, the liquid outlet of the second cooling chamber 31 is disposed at the bottom of the second oil sump 35 .

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

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

[0103] The provision of the first oil drain port 26 makes the discharge of the cooling oil simple and quick, and facilitates the regular replacement of the oil, ensuring that the cooling oil in the first cooling chamber 21 is always kept in the best condition. The first oil drain port 26 provided in the first oil pan 25 can ensure that all the oil, including the impurities and sediments deposited at the bottom, are completely drained, which helps to keep the first oil pan 25 clean.

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

[0105] In one possible implementation, the filter 60 is disposed on the first return line 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 line 32 and located between the second cooling chamber 31 and the second valve unit 34.

[0106] By setting the 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 pollutants 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 a possible implementation, a first liquid inlet pipeline 51 is provided between the liquid outlet of the heat exchanger 50 and the liquid inlet of the first cooling chamber 21 , and a second liquid inlet pipeline 52 is provided between the liquid outlet of the heat exchanger 50 and the liquid inlet of the second cooling chamber 31 .

[0108] Through independent pipelines, the cooling oil can be evenly distributed to each cooling cavity, ensuring that each motor can get enough cooling oil, thereby improving cooling efficiency.

[0109] In a possible implementation, a cooling oil tank 70 is further included, and the liquid outlet of the heat exchanger 50 is connected to the liquid inlet of the cooling oil tank 70, and the liquid outlet of the cooling oil tank 70 is connected to the liquid inlet of the cooling cavity through a liquid inlet pipeline.

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

[0111] The setting of the cooling oil tank 70 can store and buffer the cooling oil, so that stable cooling oil can be provided to each cooling cavity, ensuring that the cooling cavity can obtain sufficient oil under various operating conditions. At the same time, the cooling oil tank 70 also helps to settle and separate bubbles and impurities in the oil, ensuring that the oil entering the cooling cavity is purer and reducing wear on the system. In addition, the cooling oil tank 70 provides a centralized point for easy inspection, replenishment and replacement of the oil, simplifying the maintenance of the system.

[0112] In a possible implementation, it also includes a liquid inlet oil pump, which is arranged on the liquid inlet pipeline.

[0113] In a possible implementation, the cooling device 100 further includes a first liquid inlet oil pump 81 and a second liquid inlet oil pump 82 . The first liquid inlet oil pump 81 is disposed on the first liquid inlet pipeline 51 , and the second liquid inlet oil pump 82 is disposed on the second liquid inlet pipeline 52 .

[0114] By equipping each cooling cavity with an independent inlet oil pump, the cooling oil flow entering each cooling cavity can be accurately controlled. It can cooperate with the liquid level sensor and valve unit to adjust the cooling oil supply according to specific cooling needs and improve cooling efficiency. The independent oil pump can also quickly respond to changes in cooling needs, provide instant flow adjustment, and ensure stable operation of the system.

[0115] In a possible implementation, the cooling device 100 further includes an angle sensor 91 . The angle sensor 91 is disposed on the vehicle frame 10 , and the controller is control-connected to the angle sensor 91 .

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

[0117] In a possible implementation, a temperature sensor 92 is further included. The temperature sensor 92 is disposed in the cooling chamber, and the controller is control-connected to the temperature sensor 92 .

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

[0119] The temperature sensor 92 can monitor the temperature in the cooling chamber in real time, provide accurate data to reflect the current cooling status, and promptly detect abnormal temperature of the drive motor to prevent overheating. The controller can dynamically adjust the operating parameters according to the data provided by the temperature sensor 92, such as adjusting the flow of cooling oil or starting additional cooling measures to maintain the optimal operating temperature.

[0120] In a possible implementation, the liquid inlet of the cooling cavity is arranged at the top of the cooling cavity.

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

[0122] By setting the liquid inlet at the top of the cooling chamber, the cooling oil can flow downward naturally under the action of gravity, ensuring that the oil can fully cover the entire cooling chamber, ensuring that all parts that need to be cooled can be effectively cooled, reducing the risk of local overheating, and improving heat exchange efficiency. At the same time, since the oil enters from the top, the bubbles that may exist in the pipeline can be more easily discharged from the cooling chamber, reducing the impact of bubbles on cooling efficiency.

[0123] The cooling device 100 provided in the embodiment of the present application 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 in the vehicle drive system. Cooling oil is stored in the cooling chamber to cool the corresponding drive motors. The liquid level sensor corresponds to the at least two cooling chambers and is arranged in the corresponding cooling chambers. A reflux 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 arranged on the corresponding reflux pipeline. When the liquid level signal emitted by the liquid level sensor indicates that the liquid level in the cooling chamber is lower than the first preset liquid level value, the control valve unit is closed to increase the cooling oil in 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 control valve unit is opened.

[0124] By arranging a valve unit on the return pipeline between the circulation pump 40 and the cooling chamber, and arranging a liquid level sensor in the cooling chamber, when the cooling oil in the cooling chamber decreases, the liquid level sensor arranged therein senses the decrease in the liquid level of the cooling oil, and controls the corresponding valve unit to close, so that the cooling oil in the corresponding cooling chamber will not flow out from the liquid outlet, but the cooling oil will continue to flow in from the liquid inlet, so that the cooling oil in the cooling chamber increases, until the liquid level rises to a certain height, and the corresponding valve unit opens, so as to accurately control the flow and liquid level of the cooling oil in the cooling chamber, ensure that the cooling oil is always kept in the optimal range, so that there is enough oil in the cooling chamber for effective cooling, prevent the motor from overheating, extend the service life of the motor, reduce power loss, and improve the efficiency and reliability of the system.

[0125] On the other hand, the embodiment of the present application further 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 the first drive motor 20 and the second drive motor 30, and the power supply is used to provide power for the first drive motor 20, the second drive motor 30 and the circulating pump 40.

[0126] In view of the fact 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 are not further described in this embodiment.

[0127] On the other hand, an embodiment of the present application further provides a vehicle, comprising the above-mentioned vehicle drive system.

[0128] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0129] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0130] It should be easily understood that the terms “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0131] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description 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 in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooling device for a vehicle drive system, characterized in that: include: At least two cooling chambers, the at least two cooling chambers are respectively formed in corresponding drive motors in the vehicle drive system, and cooling oil is stored in the cooling chambers to cool the corresponding drive motors; A circulation pump (40), wherein a reflux pipeline is provided between a liquid inlet of the circulation pump (40) and liquid outlets of the at least two cooling chambers; A liquid level sensor, the liquid level sensor corresponds to the at least two cooling cavities and is disposed in the corresponding cooling cavities; a valve unit, the valve unit corresponding to the liquid level sensor and arranged on 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 corresponding valve unit is controlled to be closed to increase the cooling oil in the cooling chamber; and when the liquid level signal indicates that the liquid level in the cooling chamber is higher than a second preset liquid level value, the corresponding valve unit is controlled to be opened.

2. The cooling device according to claim 1, characterized in that: It also includes a controller, which is control-connected to the liquid level sensor and the valve unit; The controller is used to obtain the liquid level signal sent by the liquid level sensor and compare the liquid level signal with a preset signal value to control the start and stop of the valve unit.

3. The cooling device according to claim 2, characterized in that: The preset signal value includes a first preset signal value and a second preset signal value, the first preset signal value corresponds to the first preset liquid level value, and the second preset signal value corresponds to the second preset liquid level value; 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.

4. The cooling device according to claim 1, characterized in that: The circulation pumps (40) include at least two, the at least two circulation pumps (40) corresponding to the cooling chambers, and a reflux pipeline is provided between the liquid inlet of the corresponding circulation pump (40) and the liquid outlet of the cooling chamber; When the liquid level signal emitted by 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 controlled to increase so as to increase the 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 controlled to resume.

5. The cooling device according to claim 1, characterized in that: It also comprises a filter (60), wherein a liquid inlet of the filter (60) is in communication with an end of the reflux pipeline away from the cooling chamber, and a liquid outlet of the filter (60) is in communication with a liquid inlet of the circulation pump (40).

6. The cooling device according to claim 1, characterized in that: An oil pan is formed below the cooling cavity, and the oil pan is used to store cooling oil. The liquid level sensor is arranged in the oil pan, and the liquid level sensor is used to sense the height of the cooling oil in the oil pan, thereby sending out the liquid level signal.

7. The cooling device according to claim 6, characterized in that: The liquid outlet of the cooling chamber is arranged on the oil pan, and one end of the return pipeline away from the circulation pump is communicated with the oil pan.

8. The cooling device according to claim 7, characterized in that: The liquid outlet of the cooling chamber is arranged at the bottom of the oil pan.

9. The cooling device according to claim 6, characterized in that: The oil pan is provided with an oil drain port.

10. The cooling device according to claim 1, characterized in that: It also comprises a filter (60), wherein the filter (60) is arranged on the return pipeline and located between the cooling chamber and the valve unit.

11. The cooling device according to claim 1, characterized in that: It also comprises a heat exchanger (50), the liquid inlet of the heat exchanger (50) being in communication with the liquid outlet of the circulation pump (40), and a liquid inlet pipeline being provided between the liquid outlet of the heat exchanger (50) and the liquid inlet of the cooling chamber.

12. The cooling device according to claim 11, characterized in that It also includes a cooling oil tank (70), the liquid outlet of the heat exchanger (50) is in communication with the liquid inlet of the cooling oil tank (70), and the liquid outlet of the cooling oil tank (70) is in communication with the liquid inlet of the cooling chamber via the liquid inlet pipeline.

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

14. The cooling device according to claim 11, characterized in that It also includes a liquid inlet oil pump, which is arranged on the liquid inlet pipeline.

15. The cooling device according to claim 2, characterized in that: It also includes an angle sensor (91), the angle sensor (91) being arranged on a vehicle frame (10) in the vehicle drive system, and the controller being control-connected to the angle sensor (91).

16. The cooling device according to claim 2, characterized in that: It also includes a temperature sensor (92), the temperature sensor (92) being arranged in the cooling cavity, and the controller being control-connected to the temperature sensor (92).

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

18. A vehicle driving system, characterized in that: It comprises a power supply and a cooling device as described in any one of claims 1 to 17.

19. A vehicle, characterized in that: Comprising the vehicle drive system as claimed in claim 18.

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