Cooling and lubricating system, electric drive assembly and vehicle

Abstract

The invention discloses a cooling and lubricating system, an electric drive assembly and a vehicle, and relates to the technical field of electric drive cooling and lubricating, the cooling and lubricating system comprises a pumping assembly and a cooling and lubricating pipeline, the cooling and lubricating pipeline comprises a cooling assembly, a main pipeline, a cooling pipeline, a lubricating pipeline and an oil pan, and the oil pan is used for storing lubricating oil; the cooling assembly is used for cooling lubricating oil, the two ends of the pumping assembly communicate with the oil pan and the main pipeline correspondingly, the two ends of the lubricating pipeline communicate with the main pipeline and the change gear set correspondingly, the two ends of the cooling assembly communicate with the main pipeline and the cooling pipeline correspondingly, and the cooling pipeline communicates with the motor assembly. The oil pan is used for communicating with the motor assembly and the change gear set. The main pipeline is divided into the main pipeline, the cooling pipeline and the lubricating pipeline, so that the flow velocity in the cooling pipeline and the lubricating pipeline can be reduced, the flow resistance of the cooling and lubricating system can be reduced on the premise of not obviously increasing the number of oil paths, and the power consumption is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive cooling and lubrication, and in particular to a cooling and lubrication system, an electric drive assembly and a vehicle. Background Art

[0002] With the development of science and technology and people's needs, new energy vehicles are increasingly used in people's lives due to their clean and environmentally friendly characteristics. New energy vehicles are deeply favored by consumers.

[0003] In the prior art, the cooling and lubrication system of new energy vehicles uses a pumping system to pump the lubricating oil in the oil pan to the motor and gear set for lubrication and cooling at the same time. Under normal circumstances, the cooling oil circuit and the lubricating oil circuit are not specifically distinguished, but the oil channels are arranged according to the principle of proximity, that is, the cooling oil circuit and the lubricating oil circuit are mixed. As electric drives adopt more active lubrication solutions, the oil volume in the lubricating oil circuit will increase significantly, which will cause an increase in the oil volume passing through the main circuit and the oil-water exchanger, which will increase the overall flow resistance of the cooling and lubrication system.

[0004] Therefore, it is necessary to provide a new cooling and lubrication system, electric drive assembly and vehicle to solve the above technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a cooling and lubrication system, an electric drive assembly and a vehicle, aiming to improve the technical problem in the prior art that the flow resistance of the cooling and lubrication system is too large, thereby causing increased power consumption.

[0006] To achieve the above object, the present invention provides a cooling and lubricating system for providing lubricating oil to an electric drive assembly, wherein the electric drive assembly includes a motor assembly and a speed change gear set drivingly connected to the motor assembly, and the cooling and lubricating system includes:

[0007] Pumping components;

[0008] A cooling and lubrication pipeline, the cooling and lubrication pipeline includes a cooling component, a main pipeline, a cooling pipeline, a lubrication pipeline and an oil pan, the oil pan is used to store the lubricating oil, the cooling component is used to cool the lubricating oil, the two ends of the pumping component are respectively connected to the oil pan and the main pipeline, the two ends of the lubrication pipeline are respectively connected to the main pipeline and the speed gear set, the two ends of the cooling component are respectively connected to the main pipeline and the cooling pipeline, the cooling pipeline is used to communicate with the motor assembly, and the oil pan is used to communicate with the motor assembly and the speed gear set.

[0009] In one embodiment, the pumping assembly is configured to be in driving connection with the speed change gear set.

[0010] In one embodiment, the pumping assembly includes a mechanical pump and an electronic pump, both ends of the mechanical pump and the electronic pump are respectively connected to the oil pan and the main pipeline, and the mechanical pump is used for driving connection with the speed change gear set.

[0011] In one embodiment, the cooling pipeline includes a first cooling branch and a second cooling branch, one end of the first cooling branch and the second cooling branch are both connected to the cooling component, and the other ends of the first cooling branch and the second cooling branch are respectively used to connect to the stator of the motor component and the rotor of the motor component.

[0012] In one embodiment, the lubrication pipeline includes a first lubrication branch and a second lubrication branch, one end of the first lubrication branch and the second lubrication branch are both connected to the main pipeline, and the other ends of the first lubrication branch and the second lubrication branch are respectively used to connect to the bearings of the speed change gear set and the gears of the speed change gear set.

[0013] In one embodiment, the cooling and lubrication system further comprises a solenoid valve, and the solenoid valve is arranged in the cooling pipeline; or,

[0014] The solenoid valve is arranged on the main pipeline, and the solenoid valve is located between the lubrication pipeline and the cooling component.

[0015] In one embodiment, the cooling assembly includes an oil-water heat exchanger and a cooling water circuit, the cooling water circuit is connected to the oil-water heat exchanger, and both ends of the oil-water heat exchanger are respectively connected to the main pipeline and the cooling pipeline.

[0016] In one embodiment, the cooling water circuit includes a water pump, a water tank and a cooler, and the oil-water heat exchanger includes a first inlet, a second inlet, a first outlet and a second outlet, the first inlet is connected to the main pipeline, the first outlet is connected to the cooling pipeline, the second inlet and the second outlet are respectively connected to the water pump, and the water pump is connected to the water tank, and the water pump is used to pump the cooling water in the water tank to the oil-water heat exchanger.

[0017] In one embodiment, the cooling and lubrication system further includes a controller, a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used to detect the temperature of the lubricating oil in the oil pan, and the second temperature sensor is used to detect the temperature of the motor assembly, and the first temperature sensor, the second temperature sensor and the pumping assembly are all connected to the controller signal.

[0018] In one embodiment, the cooling water circuit further includes a cooler, and the cooler is respectively connected to the controller, the water pump and the oil-water heat exchanger.

[0019] The present invention also proposes an electric drive assembly, including a housing, a motor assembly, a speed gear set and the cooling and lubrication system described above, wherein the motor assembly and the speed gear set are both arranged in the housing, and the speed gear set is drivingly connected to the motor assembly.

[0020] In one embodiment, the housing includes a right housing, a middle housing and a left housing, the motor assembly includes a motor cavity, the speed gear set includes a gear cavity, the right housing, the middle housing and the left housing are assembled together to form the oil pan, and the oil pan is respectively connected to the motor cavity and the gear cavity.

[0021] The present invention also proposes a vehicle, comprising the electric drive assembly as described above, wherein the number of the electric drive assemblies is two, and the two electric drive assemblies are respectively used for the front drive of the vehicle and the rear drive of the vehicle, or the two electric drive assemblies are arranged 180° opposite to each other.

[0022] In the above scheme, the cooling and lubrication system is used to provide lubricating oil to the electric drive assembly. The electric drive assembly includes a motor assembly and a speed gear set transmission-connected to the motor assembly. The cooling and lubrication system includes a pumping assembly and a cooling and lubrication pipeline. The cooling and lubrication pipeline includes a cooling assembly, a main pipeline, a cooling pipeline, a lubrication pipeline and an oil pan. The oil pan is used to store lubricating oil. The cooling assembly is used to cool the lubricating oil. The two ends of the pumping assembly are respectively connected to the oil pan and the main pipeline. The two ends of the lubrication pipeline are respectively used to communicate with the main pipeline and the speed gear set. The two ends of the cooling assembly are respectively connected to the main pipeline and the cooling pipeline. The cooling pipeline is used to communicate with the motor assembly. The oil pan is used to communicate with the motor assembly and the speed gear set. Specifically, the pumping assembly is started, and the pumping assembly pumps the lubricating oil in the oil pan into the main pipeline, and then the oil is split from the main pipeline and flows into the lubrication pipeline and the cooling assembly respectively. The lubricating oil flowing into the lubrication pipeline continues to flow into the speed change gear set to lubricate the gears and bearings. After the lubrication is completed, the lubricating oil in the speed change gear set will flow back to the oil pan to realize the lubrication circulation of the speed change gear set, and at the same time, the lubricating oil flowing into the cooling assembly is cooled. After the lubricating oil is cooled, it flows out of the cooling assembly to the cooling pipeline, and then continues to flow into the motor assembly to cool the stator and rotor. After the cooling is completed, the lubricating oil in the motor assembly will flow back to the oil pan to realize the cooling of the motor assembly. ; In the prior art, cooling pipelines and lubrication pipelines are not specifically distinguished from each other, but the oil channels are arranged according to the principle of proximity, that is, the cooling pipelines and lubrication pipelines are mixedly arranged; as electric drives adopt more active lubrication solutions, the amount of oil in the lubrication oil circuit increases significantly, which will cause an increase in the amount of oil passing through the main pipeline and the cooling component, which will result in the need to make the cooling component larger and increase the overall flow resistance of the cooling and lubrication system; therefore, in the present invention, after distinguishing the lubrication pipeline from the cooling pipeline, the flow resistance of the cooling and lubrication system can be effectively reduced without increasing the number of pipelines too much, while reducing the flow rate of lubricating oil flowing into the cooling component, thereby effectively reducing the size of the cooling component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a first embodiment of a cooling and lubrication system provided by the present invention;

[0025] Figure 2 A schematic structural diagram of a second embodiment of a cooling and lubrication system provided by the present invention;

[0026] Figure 3 This is a schematic structural diagram of a third embodiment of the cooling and lubrication system provided by the present invention.

[0027] Description of Figure Numbers:

[0028] 100. Cooling and lubrication system; 1. Pumping assembly; 2. Cooling and lubrication pipeline; 201. Motor assembly; 202. Speed ​​change gear set; 21. Cooling assembly; 22. Main pipeline; 23. Cooling pipeline; 24. Lubrication pipeline; 25. Oil pan; 11. Mechanical pump; 12. Electronic pump; 231. First cooling branch; 232. Second cooling branch; 201a. Stator; 201b. Rotor; 241. First lubrication branch; 242. Second lubrication branch; 202a. Bearing; 202b. Gear; 3. Solenoid valve; 211. Oil-water heat exchanger; 212. Cooling water circuit; 212a. Water pump; 212b. Water tank; 4. Controller; 5. First temperature sensor; 6. Second temperature sensor; 212c. Cooler.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] In the prior art, the cooling and lubrication system of new energy vehicles uses a pumping system to pump the lubricating oil in the oil pan to the motor and gear set for lubrication and cooling at the same time. Under normal circumstances, the cooling oil circuit and the lubricating oil circuit are not specifically distinguished, but the oil channels are arranged according to the principle of proximity, that is, the cooling oil circuit and the lubricating oil circuit are mixed. As electric drives adopt more active lubrication solutions, the oil volume in the lubricating oil circuit will increase significantly, which will cause an increase in the oil volume passing through the main circuit and the oil-water exchanger, which will increase the overall flow resistance of the cooling and lubrication system.

[0034] See also Figure 1The present invention proposes a cooling and lubricating system 100, which is used to provide lubricating oil to an electric drive assembly. The electric drive assembly includes a motor component 201 and a speed gear set 202 drivingly connected to the motor component 201. The cooling and lubricating system 100 includes a pumping component 1 and a cooling and lubricating pipeline 2. The cooling and lubricating pipeline 2 includes a cooling component 21, a main pipeline 22, a cooling pipeline 23, a lubricating pipeline 24 and an oil pan 25. The oil pan 25 is used to store lubricating oil. The cooling component 21 is used to cool the lubricating oil. The two ends of the pumping component 1 are respectively connected to the oil pan 25 and the main pipeline 22. The two ends of the lubricating pipeline 24 are respectively connected to the main pipeline 22 and the speed gear set 202. The two ends of the cooling component 21 are respectively connected to the main pipeline 22 and the cooling pipeline 23. The cooling pipeline 23 is used to communicate with the motor component 201. The oil pan 25 is used to communicate with the motor component 201 and the speed gear set 202. Specifically, the pumping assembly 1 is started, and the pumping assembly 1 pumps the lubricating oil in the oil pan 25 into the main pipeline 22, and then the oil is divided from the main pipeline 22 and flows into the lubricating pipeline 24 and the cooling assembly 21 respectively. The lubricating oil flowing into the lubricating pipeline 24 continues to flow into the speed change gear set 202 to lubricate the gear 202b and the bearing 202a. After the lubrication is completed, the lubricating oil in the speed change gear set 202 will flow back to the oil pan 25 to realize the lubrication cycle of the speed change gear set 202, and at the same time, the lubricating oil flowing into the cooling assembly 21 is cooled. After the lubricating oil is cooled, it flows out of the cooling assembly 21 to the cooling pipeline 23, and then continues to flow into the motor assembly 201 to cool the stator 201a and the rotor 201b. After the cooling is completed, the lubricating oil in the motor assembly 201 will flow back to the oil pan. 25, the cooling of the motor assembly 201 is realized; in the prior art, the cooling pipeline 23 and the lubrication pipeline 24 are not specifically distinguished, but the oil channels are arranged according to the principle of proximity, that is, the cooling pipeline 23 and the lubrication pipeline 24 are mixedly arranged; as the electric drive adopts more active lubrication solutions, the oil volume in the lubrication oil circuit increases significantly, which will cause the oil volume passing through the main pipeline 22 and the cooling assembly 21 to increase, which will lead to the need to make the cooling assembly 21 larger, and also increase the overall flow resistance of the cooling and lubrication system 100; and in the present invention, after the lubrication pipeline 24 and the cooling pipeline 23 are distinguished, the flow resistance of the cooling and lubrication system 100 can be effectively reduced without increasing the number of pipelines too much, and at the same time, the flow rate of the lubricating oil flowing into the cooling assembly 21 is reduced, so that the size of the cooling assembly 21 can be effectively reduced.

[0035] In one embodiment, the pumping assembly 1 is used for transmission connection with the speed gear set 202. Specifically, by transmission connection of the pumping assembly 1 with the speed gear set 202, when the electric drive assembly is started, the speed gear set 202 starts to rotate, and the pumping assembly 1 transmission connection with the speed gear set 202 starts to pump oil, and the pumping assembly 1 pumps the lubricating oil in the oil pan 25 into the main line 22, and then branches from the main line 22 to flow into the lubricating line 24 and the cooling assembly 21 respectively, and then the lubricating oil in the lubricating line 24 continues to flow into the speed gear set 202 to lubricate the gears and bearings 202a, and after the lubrication is completed, the lubricating oil in the speed gear set 202 will flow back to the oil pan The oil pan 25 is used for the lubrication circulation of the speed change gear set 202, and the lubricating oil flowing into the cooling component 21 is cooled by the cooling component 21. After the lubricating oil is cooled, it flows out from the cooling component 21 to the cooling pipe 23, and then continues to flow into the motor component 201 to cool the stator 201a and the rotor 201b. After the cooling is completed, the lubricating oil in the motor component 201 will flow back to the oil pan 25 to cool the motor component 201. In this way, there is no need to drive the pumping component 1 separately for pumping, which reduces the production cost. The flow rate of the pump oil changes with the vehicle speed, so that the cooling and lubrication needs can be met in real time.

[0036] Figure 3 The solid line in the middle is the flow route of the lubricating oil, the dotted line above is the flow route of the cooling water, and the dotted line below is the control line.

[0037] See also Figure 3 In one embodiment, the pumping assembly 1 includes a mechanical pump 11 and an electronic pump 12. Both ends of the mechanical pump 11 and the electronic pump 12 are respectively connected to the oil pan 25 and the main pipeline 22. The mechanical pump 11 is used for transmission connection with the speed gear set 202. By setting the mechanical pump 11, the mechanical pump 11 is transmission connected with the speed gear set 202. When the electric drive assembly is started and the speed gear set 202 starts to rotate, the mechanical pump 11 starts to pump oil following the rotation, and no additional drive parts are needed to drive the mechanical pump 11 to work. Generally, when the vehicle speed is sufficient, the flow rate of the pumped lubricating oil can meet the cooling needs of the motor assembly 201 and the lubrication needs of the speed gear set 202; when the cooling needs of the motor assembly 201 are insufficient or the lubrication needs of the speed gear set 202 are insufficient, the electronic pump 12 replenishes the lubricating oil. For example, when the vehicle speed is low and the amount of oil pumped by the mechanical pump 11 is insufficient, or when the wheel speeds on both sides of the distributed electric drive are inconsistent, resulting in insufficient oil in the mechanical pump 11, etc., the electronic pump 12 starts and pumps oil at the same time as the mechanical pump 11, so that the amount of oil meets the cooling needs of the motor assembly 201 or the lubrication needs of the speed gear set 202.

[0038] See also Figure 2 and Figure 3In one embodiment, the cooling pipeline 23 includes a first cooling branch 231 and a second cooling branch 232, one end of each of the first cooling branch 231 and the second cooling branch 232 is connected to the cooling assembly 21, and the other ends of the first cooling branch 231 and the second cooling branch 232 are respectively used to communicate with the stator 201a of the motor assembly 201 and the rotor 201b of the motor assembly 201. Specifically, the first cooling branch 231 is used to provide lubricating oil for cooling the stator 201a of the motor assembly 201 of the electric drive assembly, and the second cooling branch 232 is used to provide lubricating oil for cooling the rotor 201b of the motor assembly 201 of the electric drive assembly. In this way, the stator 201a and the rotor 201b of the motor assembly 201 can be provided with lubricating oil for cooling, thereby reducing the working temperature of both; by such a setting, the cooling pipeline 23 is branched into two branches, which can further reduce the flow resistance of the cooling pipeline 23, further reduce the power consumption of the entire cooling and lubrication system 100, and further save the use cost.

[0039] Furthermore, a plurality of first branch paths are provided at one end of the stator 201a connected to the motor assembly 201 of the electric drive assembly via the first cooling branch 231, and lubricating oil is provided to a plurality of different regions of the stator 201a via the plurality of first branch paths, thereby enabling faster cooling of the plurality of regions of the stator 201a.

[0040] The second cooling branch 232 is connected to the motor assembly 201 of the electric drive assembly. One end of the rotor 201b is provided with multiple second branch roads. Cooling oil is provided to multiple different areas of the rotor 201b through the multiple second branch roads, so that the cooling of multiple areas of the rotor 201b can be achieved more quickly.

[0041] See also Figure 2 and Figure 3 In one embodiment, the lubrication pipeline 24 includes a first lubrication branch 241 and a second lubrication branch 242. One end of each of the first lubrication branch 241 and the second lubrication branch 242 is connected to the main pipeline 22, and the other ends of the first lubrication branch 241 and the second lubrication branch 242 are respectively used to communicate with the bearing 202a of the speed gear set 202 and the gear of the speed gear set 202. Specifically, the first lubrication branch 241 is used to provide lubricating oil to lubricate the gear 202b of the speed gear set 202 of the electric drive assembly, and the second lubrication branch 242 is used to provide lubricating oil to lubricate the bearing 202a of the speed gear set 202 of the electric drive assembly. In this way, the gear 202b and the bearing 202a of the speed gear set 202 can be lubricated with lubricating oil; by such a setting, the lubrication pipeline 24 is branched into two branches, which can further reduce the flow resistance of the lubrication pipeline 24, further reduce the power consumption of the entire cooling and lubricating system 100, and further save the use cost.

[0042] Furthermore, the first lubrication branch 241 and the second lubrication branch 242 can also be expanded, that is, the first lubrication branch 241 and the second lubrication branch 242 can be branched into sub-branches corresponding to the various components in the speed gear set 202, such as the differential active lubrication sub-branch, the clutch active lubrication sub-branch and the oil seal active lubrication sub-branch, etc., so that each component can be actively lubricated separately.

[0043] Furthermore, a plurality of third branch roads are provided between the first lubrication branch road 241 and one end of the gear 202b of the speed gear set 202 of the electric drive assembly, and lubricating oil is provided to the plurality of gears 202b through the plurality of third branch roads, so that the simultaneous lubrication of the plurality of gears 202b can be achieved more quickly.

[0044] A plurality of fourth branches are provided between the second lubrication branch 242 and one end of the bearing 202a of the speed change gear set 202 of the electric drive assembly, and lubricating oil is provided to the plurality of bearings 202a through the plurality of fourth branches, so that the simultaneous lubrication of the plurality of bearings 202a can be achieved more quickly.

[0045] Furthermore, the first cooling branch 231, the second cooling branch 232, the first lubrication branch 241 and the second lubrication branch 242 may be external pipes as connecting pieces between adjacent components, or may be channels formed in the housing of the electric drive assembly as connecting pieces between adjacent components.

[0046] See also Figures 1 to 3 In one embodiment, the cooling and lubrication system 100 further includes a solenoid valve 3, which is disposed in the cooling pipeline 23; or

[0047] The solenoid valve 3 is arranged in the main pipeline 22, and the solenoid valve 3 is located between the lubrication pipeline 24 and the cooling assembly 21. The solenoid valve 3 is a hydraulic valve that converts the input electrical signal into force or displacement in proportion to control the flow rate. The solenoid valve 3 is used to adjust the flow rate ratio of the lubricating oil flowing into the cooling pipeline 23. When the temperature is extremely low, the motor assembly 201 does not need to be cooled by the lubricating oil, and the cooling can be achieved by the external environment. Therefore, the cooling pipeline 23 is disconnected from the main pipeline 22 through the solenoid valve 3, which reduces the flow resistance of the cooling and lubrication system 100 under extremely low temperature conditions, reduces power consumption, and improves the efficiency of electric drive.

[0048] Furthermore, the cooling and lubricating system 100 further includes a flow regulating valve, which is disposed on the lubrication pipeline 24 and is located between the main pipeline 22 and the speed gear set 202, so that the flow of the lubricating oil entering the speed gear set 202 can be regulated;

[0049] It is understandable that when the vehicle is horizontal or at a small inclination, the splash lubrication inside the reduction box can meet the lubrication needs of the bearing 202a, and the lubrication pipeline 24 can be closed, thereby reducing the amount of oil delivered by the cooling lubrication system 100 and reducing power consumption. When the vehicle is at a large angle of longitudinal or lateral inclination, the flow regulating valve is opened to allow the lubricating oil to flow into the lubrication pipeline 24, actively lubricating and replenishing the bearing 202a.

[0050] See also Figure 2 and Figure 3 In one embodiment, the cooling assembly 21 includes an oil-water heat exchanger 211 and a cooling water circuit 212. The cooling water circuit 212 is connected to the oil-water heat exchanger 211. Both ends of the oil-water heat exchanger 211 are respectively connected to the main line 22 and the cooling line 23. Specifically, the oil-water heat exchanger 211 is used to cool down the lubricating oil in the main line 22 that enters the oil-water heat exchanger 211. The oil-water heat exchanger 211 is connected to the cooling water circuit 212 and is in the cooling water circulation path. The low-temperature cooling water flows into the oil-water heat exchanger 211, absorbs the heat of the lubricating oil entering the oil-water heat exchanger 211 from the main line 22, cools the lubricating oil and enters the cooling line 23, and then continues to flow to the motor assembly 201 to cool the motor assembly 201; the oil-water heat exchanger 211 usually has a high heat transfer coefficient, which means that they can exchange heat quickly and effectively. The oil-water heat exchanger 211 can transfer heat without direct contact, reducing the risk of mixing the two fluids. For flammable or toxic liquids, the oil-water heat exchanger 211 provides a safe isolation measure to prevent potential safety accidents. Compared with direct contact heat exchange systems, the design of the oil-water heat exchanger 211 makes cleaning and maintenance simpler, with a compact structure and easy disassembly and cleaning, thereby reducing maintenance time and cost. The oil-water heat exchanger 211 can also help maintain stable oil and water temperatures, prevent equipment damage caused by overheating or overcooling, and help protect mechanical equipment and extend its service life.

[0051] See also Figure 3In one embodiment, the cooling water circuit 212 includes a water pump 212a and a water tank 212b, and the oil-water heat exchanger 211 includes a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet is connected to the main pipeline 22, the first outlet is connected to the cooling pipeline 23, the second inlet and the second outlet are connected to the water pump 212a respectively, the water pump 212a is connected to the water tank 212b, and the water pump 212a is used to send the cooling water in the water tank 212b to the oil-water heat exchanger 211; specifically, the water pump 212a sends the cooling water in the water tank 212b to the second inlet, and the cooling water enters the oil-water heat exchanger. In the cooling water pipeline in the heat exchanger 211, the lubricating oil enters the oil pipeline in the oil-water heat exchanger 211 from the first inlet, and the oil pipeline and the cooling water pipeline are close to each other, so that the cooling water will absorb the heat of the lubricating oil in the oil pipeline, thereby reducing the temperature of the lubricating oil, and then the lubricating oil flows out from the first outlet to the cooling pipeline 23, and then cools the motor assembly 201. The cooling water that has absorbed the heat will flow out of the water pump 212a from the second outlet, and then return to the water tank 212b, thus realizing the cooling water circulation. Through such a setting, the cooling water can be circulated, the loss of cooling water is reduced, and the use cost is further reduced.

[0052] See also Figure 3 In one embodiment, the cooling and lubricating system 100 further includes a controller 4, a first temperature sensor 5 and a second temperature sensor 6. The first temperature sensor 5 is used to detect the temperature of the lubricating oil in the oil pan 25, and the second temperature sensor 6 is used to detect the temperature of the motor assembly 201. The first temperature sensor 5, the second temperature sensor 6 and the pumping assembly 1 are all connected to the controller 4 by signal. Specifically, the second temperature sensor 6 detects the temperature of the motor assembly. When the temperature of the motor assembly 201 is high and the current flow cannot cool the motor assembly 201, the controller 4 controls the pumping assembly 1 to increase the speed and output power, so that the pumped lubricating oil can be increased, so that the temperature of the motor assembly 201 can be kept within the safe value, and the use safety of the motor assembly 201 can be ensured. The first temperature sensor 5 is used to detect the temperature of the lubricating oil in the oil pan 25. When the first temperature sensor 5 detects that the temperature of the lubricating oil has dropped to a preset value, the surface motor 201 assembly has been cooled down. In this way, the pumping assembly 1 is controlled by the controller 4 to reduce the speed and output power back to a normal state. The second temperature sensor 6 and the first temperature sensor 1 work together to control the speed and output power through the controller 4.

[0053] See also Figure 3In one embodiment, the cooling water circuit 212 further includes a cooler 212c, and the cooler 212c is respectively connected to the controller 4, the water pump 212a and the oil-water heat exchanger 211. Specifically, the water pump 212a pumps the cooling water in the water tank 212b to the cooler 212c, and the cooler 212c cools the controller 4. Then the cooling water flows out of the cooler 212c and enters the second inlet. The cooling water enters the cooling water pipeline in the oil-water heat exchanger 211, and the lubricating oil enters the oil pipeline in the oil-water heat exchanger 211 from the first inlet. The oil pipeline and the cooling water pipeline are close to each other, so that the cooling water will absorb the heat of the lubricating oil in the oil pipeline, thereby reducing the temperature of the lubricating oil. Then the lubricating oil flows out from the first outlet to the cooling pipeline 23, and then cools the motor assembly 201. The cooling water that has absorbed the heat will flow out of the water pump 212a from the second outlet, and then return to the water tank 212b, thus realizing the cooling water circulation; through such a setting, the controller 4 can be cooled to ensure the normal operation of the controller 4.

[0054] The present invention also proposes an electric drive assembly, including a housing, a motor assembly 201, a speed gear set 202 and the above-mentioned cooling and lubricating system 100, wherein the motor assembly 201 and the speed gear set 202 are both arranged in the housing, and the speed gear set 202 is connected to the motor assembly 201 in a transmission manner. The housing has an installation cavity, the motor assembly 201 is arranged in the installation cavity, and the speed gear set 202 is arranged in the installation cavity and is connected to the motor assembly 201 in a transmission manner. In this way, the motor assembly 201 can drive the speed gear set 202 to rotate, thereby driving the tire to rotate, and when the speed gear set 202 rotates, the mechanical pump 11 can follow the rotation and pump oil. It can be understood that since the mechanical pump 11 is arranged in the installation cavity of the housing, the housing can reduce its noise; since the electric drive assembly includes all implementation methods of all embodiments of the above-mentioned cooling and lubricating system 100, it at least has all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0055] In one embodiment, the housing includes a right housing, a middle housing and a left housing, the motor assembly 201 includes a motor cavity, the speed gear set 202 includes a gear cavity, the right housing, the middle housing and the left housing are assembled to form an oil pan 25, and the oil pan 25 is respectively connected to the motor cavity and the gear cavity; the motor assembly 201 cooling and the speed gear set 202 lubrication are designed for common oil. First, the right housing, the middle housing and the left housing are electrically driven to form an oil pan 25 after the housing is assembled, and the oil in the motor cavity and the gear cavity will enter the oil pan 25 through the drainage structure, and the lubricating oil in the oil pan 25 is pumped to the main pipeline 22 under the action of the lubricating oil pumping assembly 1, and then diverted to the lubrication pipeline 24 and the cooling pipeline 23, so as to realize the cooling of the motor assembly 201 and the lubrication of the speed gear set 202, and realize the full circulation of the lubricating oil. With such a setting, it is not necessary to take oil from the outside, which greatly simplifies the structure and reduces the production cost.

[0056] The present invention also proposes a vehicle, comprising the electric drive assembly as described above, the number of the electric drive assemblies is two, the two electric drive assemblies are used for the front drive of the vehicle and the rear drive of the vehicle respectively, or the two electric drive assemblies are arranged 180° opposite to each other. The two sets of electric drive assemblies are oriented in opposite directions, that is, the two sets of electric drive assemblies are 180° opposite to each other. Since the two sets of electric drive assemblies are oriented in opposite directions, when one set of electric drive assemblies rotates forward, the other electric drive assembly will rotate in reverse. The lubrication of the bearing 202a of the speed change gear set 202 is achieved by rotating the oil guide ribs on the gear 202b of the speed change gear set 202. The reverse rotation of the gear 202b will change the amount of oil delivered, and the above change will affect the lubrication of the bearing 202a of the speed change gear set 202. When the bearing 202a of the speed gear set 202 is insufficiently supplied with oil, the oil supply to the bearing 202a can be compensated by adjusting the flow regulating valve; if the distributed electric drive is distributed 180° to the front and rear axles of the vehicle, a bidirectional mechanical pump 11 is used to pump the lubricating oil, which can ensure the continuous supply of the lubricating oil flow; since the vehicle includes all implementation methods of all the embodiments of the above-mentioned electric drive assembly, it has at least all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0057] In the description of the present application, the description with reference to the terms "some embodiments", "exemplarily", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0058] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooling and lubricating system for providing lubricating oil to an electric drive assembly, wherein the electric drive assembly comprises a motor assembly and a speed change gear set drivingly connected to the motor assembly, characterized in that: The cooling and lubrication system comprises: Pumping components; A cooling and lubrication pipeline, the cooling and lubrication pipeline includes a cooling component, a main pipeline, a cooling pipeline, a lubrication pipeline and an oil pan, the oil pan is used to store the lubricating oil, the cooling component is used to cool the lubricating oil, the two ends of the pumping component are respectively connected to the oil pan and the main pipeline, the two ends of the lubrication pipeline are respectively connected to the main pipeline and the speed gear set, the two ends of the cooling component are respectively connected to the main pipeline and the cooling pipeline, the cooling pipeline is used to communicate with the motor assembly, and the oil pan is used to communicate with the motor assembly and the speed gear set.

2. The cooling and lubrication system according to claim 1, characterized in that: The pumping assembly is used for transmission connection with the speed change gear set.

3. The cooling lubrication system according to claim 2, characterized in that: The pumping assembly comprises a mechanical pump and an electronic pump. Both ends of the mechanical pump and the electronic pump are respectively connected to the oil pan and the main pipeline. The mechanical pump is used for transmission connection with the speed change gear set.

4. The cooling and lubrication system according to claim 1, characterized in that: The cooling pipeline includes a first cooling branch and a second cooling branch, one end of the first cooling branch and the second cooling branch are both connected to the cooling component, and the other ends of the first cooling branch and the second cooling branch are respectively used to communicate with the stator of the motor component and the rotor of the motor component.

5. The cooling lubrication system according to claim 1, characterized in that: The lubrication pipeline includes a first lubrication branch and a second lubrication branch, one end of the first lubrication branch and the second lubrication branch are both connected to the main pipeline, and the other ends of the first lubrication branch and the second lubrication branch are respectively used to communicate with the bearings of the speed change gear set and the gears of the speed change gear set.

6. The cooling lubrication system according to claim 5, characterized in that: The cooling and lubrication system further comprises a solenoid valve, which is arranged in the cooling pipeline; or, The solenoid valve is arranged on the main pipeline, and the solenoid valve is located between the lubrication pipeline and the cooling component.

7. The cooling lubrication system according to any one of claims 1 to 6, characterized in that: The cooling assembly comprises an oil-water heat exchanger and a cooling water circuit. The cooling water circuit is connected to the oil-water heat exchanger. Both ends of the oil-water heat exchanger are connected to the main pipeline and the cooling pipeline respectively.

8. The cooling lubrication system according to claim 7, characterized in that: The cooling water circuit includes a water pump, a water tank and a cooler. The oil-water heat exchanger includes a first inlet, a second inlet, a first outlet and a second outlet. The first inlet is connected to the main pipeline, the first outlet is connected to the cooling pipeline, the second inlet and the second outlet are respectively connected to the water pump, and the water pump is connected to the water tank. The water pump is used to pump the cooling water in the water tank to the oil-water heat exchanger.

9. The cooling lubrication system according to claim 8, characterized in that: The cooling and lubrication system also includes a controller, a first temperature sensor and a second temperature sensor. The first temperature sensor is used to detect the temperature of the lubricating oil in the oil pan, and the second temperature sensor is used to detect the temperature of the motor assembly. The first temperature sensor, the second temperature sensor and the pumping assembly are all connected to the controller signal.

10. The cooling lubrication system according to claim 9, characterized in that: The cooling water circuit also includes a cooler, which is communicated with the controller, the water pump and the oil-water heat exchanger respectively.

11. An electric drive assembly, characterized in that: It comprises a housing, a motor assembly, a speed gear set and a cooling and lubrication system as claimed in any one of claims 1 to 10, wherein the motor assembly and the speed gear set are both arranged in the housing, and the speed gear set is drivingly connected to the motor assembly.

12. The electric drive assembly according to claim 11, characterized in that: The housing includes a right housing, a middle housing and a left housing, the motor assembly includes a motor cavity, the speed gear set includes a gear cavity, the right housing, the middle housing and the left housing are assembled together to form the oil pan, and the oil pan is communicated with the motor cavity and the gear cavity respectively.

13. A vehicle, characterized in that: It comprises an electric drive assembly as described in any one of claims 11 or 12 above, wherein the number of the electric drive assemblies is two, and the two electric drive assemblies are respectively used for the front drive of the vehicle and the rear drive of the vehicle, or the two electric drive assemblies are arranged 180° opposite to each other.

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