An oil cooling system, an electric drive assembly and a vehicle

Abstract

The embodiment of the application provides an oil cooling system, an electric drive assembly and a vehicle, and relates to the technical field of vehicles. The oil cooling system comprises: a cooling oil circuit, which is used for conveying oil to an electric drive component to be cooled; an oil cooler, an output end of the oil cooler being connected with an input end of the cooling oil circuit, and the oil cooler being used for cooling the oil; and an oil pump, which has an oil inlet, a first oil outlet and a second oil outlet, oil entering the oil pump through the oil inlet being selectively discharged from the first oil outlet or the second oil outlet; the first oil outlet being connected with the input end of the oil cooler, and the second oil outlet being connected with the input end of the cooling oil circuit. The oil cooling system has the first oil outlet and the second oil outlet through the oil pump, and the design that the oil can be selectively discharged from the first oil outlet or the second oil outlet, so that the cooling demand and energy consumption optimization under different working conditions are considered, and the overall efficiency of the oil cooling system is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to an oil cooling system, an electric drive assembly, and a vehicle. Background Technology

[0002] The electric drive assembly includes components such as a motor, reducer, motor controller, and housing assembly. During operation, the motor and reducer require cooling and lubrication.

[0003] Oil cooling systems are used to cool motors and gearboxes, and typically include components such as oil pumps and oil coolers. The oil pump delivers oil to the oil cooler, where it is cooled before being sent to the motor and gearbox to achieve both cooling and lubrication.

[0004] In related technologies, oil cooling systems experience significant flow resistance in the oil circuit under low oil temperature conditions. Utility Model Content

[0005] This application provides an oil cooling system, an electric drive assembly, and a vehicle to solve the problem of high flow resistance in the oil circuit of the oil cooling system under low oil temperature conditions in the related art.

[0006] In a first aspect, embodiments of this application provide an oil cooling system, including:

[0007] Cooling oil circuit, used to deliver oil to the electric drive components that need to be cooled;

[0008] An oil cooler, the output end of which is connected to the input end of the cooling oil circuit, is used to cool the oil.

[0009] An oil pump has an oil inlet, a first oil outlet, and a second oil outlet. The oil entering the oil pump through the oil inlet can be selectively discharged from the first oil outlet or from the second oil outlet. The first oil outlet is connected to the input end of the oil cooler, and the second oil outlet is connected to the input end of the cooling oil circuit.

[0010] The oil cooling system, with its oil pump featuring a first and second oil outlet and the ability to selectively discharge oil from either, allows for several advantages. Under low oil temperature conditions, the oil is discharged from the second outlet and enters the cooling oil circuit without passing through an oil cooler. This reduces flow resistance, accelerates oil temperature rise to lower viscosity, minimizes resistance losses, and enables rapid warm-up of the electric drive assembly, improving starting performance. Conversely, under high oil temperature conditions, the oil is discharged from the first outlet, cooled by an oil cooler, and then delivered to the electric drive components. This ensures the components operate within a safe temperature range, guaranteeing their safety and reliability. The oil cooling system balances cooling requirements under different operating conditions with energy efficiency optimization, improving its overall efficiency.

[0011] In some possible implementations, the oil cooling system further includes:

[0012] The first pipeline is connected to the first oil outlet and the input end of the oil cooler;

[0013] A first check valve is installed on the first pipeline, and along the direction from the first oil outlet to the oil cooler, the first check valve is a passage;

[0014] And / or,

[0015] The oil cooling system also includes:

[0016] The second pipeline is connected to the second oil outlet and the input end of the cooling oil circuit;

[0017] The second check valve is installed in the second pipeline, and is the passage along the direction from the second oil outlet to the cooling oil circuit.

[0018] In some possible implementations, the oil pump includes:

[0019] The pump housing has a mounting cavity, an oil inlet, a first oil outlet, and a second oil outlet; along the axial direction of the pump housing, the projections of the oil inlet, the first oil outlet, and the second oil outlet on the pump housing are spaced apart circumferentially around the pump housing.

[0020] The outer rotor is rotatably mounted within the mounting cavity;

[0021] An inner rotor is rotatably disposed inside the outer rotor, meshes with the outer rotor and is eccentrically disposed, the number of teeth of the inner rotor is less than the number of teeth of the outer rotor; an oil suction chamber and an oil pressure chamber are formed between the outer rotor and the inner rotor; the oil inlet is connected to the oil suction chamber, and the first oil outlet and the second oil outlet are both connected to the oil pressure chamber;

[0022] Wherein, when the inner rotor rotates along the first rotation direction, the oil entering from the oil inlet is discharged through the first oil outlet; when the inner rotor rotates along the second rotation direction, the oil entering from the oil inlet is discharged through the second oil outlet; the first rotation direction and the second rotation direction are opposite.

[0023] In some possible implementations, the pump housing further includes a first oil outlet groove and a second oil outlet groove, the first and second oil outlet grooves being located on opposite sides of the outer rotor along the axial direction and respectively, and both communicating with the oil pressure chamber; the first oil outlet is connected to the first oil outlet groove; and / or,

[0024] The pump casing also has a third oil outlet groove and a fourth oil outlet groove. The third oil outlet groove and the fourth oil outlet groove are located on both sides of the outer rotor along the axial direction and are arranged opposite to each other. Both are connected to the oil pressure chamber. The second oil outlet is connected to the third oil outlet groove.

[0025] In some possible implementations, the pump housing also has an oil inlet groove, the oil inlet groove and the oil inlet are respectively located on both sides of the outer rotor along the axial direction and are arranged opposite to each other, and the oil inlet groove is connected to the oil suction chamber.

[0026] In some possible implementations, the pump housing includes:

[0027] The pump housing has the first oil outlet, the first oil outlet groove, the fourth oil outlet groove, and the oil inlet groove;

[0028] The pump cover is connected to the pump housing and forms the mounting cavity. The pump cover has the oil inlet, the second oil outlet groove, and the third oil outlet groove.

[0029] Secondly, embodiments of this application provide an electric drive assembly, including:

[0030] Housing assembly;

[0031] The motor is installed within the housing assembly;

[0032] The speed reducer is installed within the housing assembly;

[0033] The oil cooling system described in the first aspect provides oil to both the motor and the reducer via its cooling oil circuit.

[0034] The electric drive assembly uses an oil cooling system to provide lubrication and cooling for the motor and reducer, taking into account both cooling requirements under different operating conditions and energy consumption optimization, thereby improving the overall efficiency of the electric drive system.

[0035] In some possible implementations, flow channels are provided on the housing assembly, which form the cooling oil passages of the oil cooling system.

[0036] In some possible implementations, the housing assembly has an oil reservoir with its inlet connected to the outlet of the cooling oil circuit; the outlet of the oil reservoir is connected to the inlet of the oil cooling system; and the oil reservoir is used to store the oil output from the cooling oil circuit.

[0037] In some possible implementations, the electric drive assembly further includes:

[0038] A temperature sensor is used to detect the temperature of the motor windings;

[0039] The controller is electrically connected to both the temperature sensor and the oil pump. Based on the temperature collected by the temperature sensor, the controller controls the operation of the oil pump so that the oil pump discharges oil through the first oil outlet or through the second oil outlet.

[0040] Thirdly, embodiments of this application provide a vehicle including the oil cooling system described in the first aspect or the electric drive assembly described in the second aspect.

[0041] It should be understood that the second and third aspects of this application correspond to the technical solutions of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an oil cooling system provided in one or more embodiments of this application;

[0043] Figure 2 Schematic diagram of the structure of the oil pump of the oil cooling system provided in one or more embodiments of this application Figure 1 ;

[0044] Figure 3 Explosion diagram of the oil pump of the oil cooling system provided in one or more embodiments of this application Figure 1 ;

[0045] Figure 4 Schematic diagram of the structure of the oil pump of the oil cooling system provided in one or more embodiments of this application Figure 2 ;

[0046] Figure 5 Explosion diagram of the oil pump of the oil cooling system provided in one or more embodiments of this application Figure 2 ;

[0047] Figure 6 Schematic diagram of the pump housing structure of the oil pump provided in one or more embodiments of this application Figure 1 ;

[0048] Figure 7 Schematic diagram of the pump housing structure of the oil pump provided in one or more embodiments of this application Figure 2 ;

[0049] Figure 8 A schematic diagram of the structure of the pump cover of an oil pump provided in one or more embodiments of this application;

[0050] Figure 9 This is a schematic diagram of the structure of an electric drive assembly provided in one or more embodiments of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100-Oil cooling system, 110-Cooling oil circuit, 120-Oil cooler, 130-Oil pump, 130a-Oil inlet, 130b-First oil outlet, 130c-Second oil outlet, 130d-Mounting cavity, 130e-First oil outlet groove, 130f-Second oil outlet groove, 130g-Third oil outlet groove, 130h-Fourth oil outlet groove, 130i-Oil inlet groove, 131-Pump housing, 131a-Allowing hole, 1311-Pump housing, 1311a-First inner bottom wall, 1311b-First outer peripheral wall, 1312-Pump cover, 1312a-Second inner bottom wall, 1312b-Second outer peripheral wall, 132-Outer rotor, 1 33-Inner rotor, 133a-Oil suction chamber, 133b-Oil pressure chamber, 133b1-First oil pressure chamber, 133b2-Second oil pressure chamber, 140-First pipeline, 150-First check valve, 160-Second pipeline, 170-Second check valve, 10-Electric drive component, 200-Housing assembly, 200a-Oil reservoir, 200b-Motor mounting cavity, 200c-Reducer mounting cavity, 210-Motor half-house, 220-Integrated housing, 230-Reducer half-house, 240-Oil pan, 300-Motor, 400-Reducer, 500-Temperature sensor, 600-Controller, 1000-Electric drive assembly. Detailed Implementation

[0053] The electric drive assembly includes components such as a motor, reducer, motor controller, and housing assembly. During operation, the motor and reducer require cooling and lubrication.

[0054] Oil cooling systems are used to cool motors and gearboxes, and typically include components such as oil pumps and oil coolers. The oil pump delivers oil to the oil cooler, where it is cooled before being sent to the motor and gearbox to achieve both cooling and lubrication.

[0055] In related technologies, oil cooling systems are mainly single-loop forced cooling systems: when the oil is at a low temperature and does not need to be cooled, it still needs to flow through the oil cooler. The oil cooler increases the flow resistance of the oil circuit and slows down the rate of oil temperature rise, resulting in higher oil viscosity and increased oil circuit resistance loss.

[0056] Therefore, in related technologies, oil cooling systems suffer from high oil flow resistance and low thermal efficiency under low oil temperature conditions, which affects the starting performance and energy economy of the electric drive assembly.

[0057] In view of this, this application designs an oil cooling system 100, an electric drive assembly 1000, and a vehicle. The oil cooling system 100, the electric drive assembly 1000, and the vehicle provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0058] like Figure 1As shown, the oil cooling system 100 includes: a cooling oil passage 110, an oil cooler 120, and an oil pump 130. The cooling oil passage 110 is used to supply oil to the electric drive component 10 to be cooled. The output end of the oil cooler 120 is connected to the input end of the cooling oil passage 110, and the oil cooler 120 is used to cool the oil. The oil pump 130 has an oil inlet 130a, a first oil outlet 130b, and a second oil outlet 130c. The oil entering the oil pump 130 through the oil inlet 130a can be selectively discharged from the first oil outlet 130b or from the second oil outlet 130c. The first oil outlet 130b is connected to the input end of the oil cooler 120, and the second oil outlet 130c is connected to the input end of the cooling oil passage 110.

[0059] The cooling oil passage 110 is used to supply oil to the electric drive component 10 of the electric drive assembly 1000. The electric drive component 10 may be the rotor of the motor 300, the stator of the motor 300, the gears of the reducer 400, etc. in the electric drive assembly 1000, and is not limited in this application. The cooling oil passage 110 delivers oil to the electric drive component 10, the oil lubricates and cools the electric drive component 10, and finally the oil can flow back to the oil reservoir 200a of the electric drive assembly 1000 for storage through the cooling oil passage 110.

[0060] Oil pump 130 is used to draw oil from oil storage tank 200a. After being pressurized by oil pump 130, the oil is selectively delivered to oil cooler 120 or directly to cooling oil circuit 110 without passing through oil cooler 120. Specifically, oil inlet 130a of oil pump 130 is used to communicate with oil storage tank 200a to draw oil from oil storage tank 200a. The oil entering oil pump 130 can be selectively discharged from first oil outlet 130b or second oil outlet 130c.

[0061] The input end of the cooling oil circuit 110 is connected to the output end of the oil cooler 120 and the second oil outlet 130c of the oil pump 130. The oil discharged from the output end of the oil cooler 120 and the oil discharged from the second oil outlet 130c of the oil pump 130 can both be sent to the cooling oil circuit 110.

[0062] The oil cooler 120 is used to cool the oil. When the oil pump 130 discharges oil from the first oil outlet 130b, the oil can enter the oil cooler 120, where it is cooled. After cooling, the oil is sent to the cooling oil passage 110, and then to the electric drive component 10, thus achieving cooling of the electric drive component 10. The type of oil cooler 120 is diverse, such as air-cooled oil coolers and liquid-cooled oil coolers. The structures of these oil coolers 120 are known to those skilled in the art and will not be described or limited in this application.

[0063] The structure of the oil pump 130 is also diverse. For example, the oil pump 130 is a gear pump, which is provided with a first oil outlet 130b and a second oil outlet 130c. Solenoid valves are provided at both the first oil outlet 130b and the second oil outlet 130c. By controlling the opening and closing of the solenoid valves, the opening and closing of the first oil outlet 130b and the second oil outlet 130c are controlled, thereby controlling the oil to be discharged from the first oil outlet 130b or the second oil outlet 130c. Another example is that the oil pump 130 is a dual-outlet screw pump, which is provided with a first oil outlet 130b and a second oil outlet 130c. The direction of rotation or axial displacement of the screw assembly is controlled by a servo motor to change the discharge path of the oil in the pump chamber. When rotating in the forward direction, the oil is discharged from the first oil outlet 130b, and when rotating in the reverse direction, it is discharged from the second oil outlet 130c.

[0064] The oil cooling system 100, through the oil pump 130, has a first oil outlet 130b and a second oil outlet 130c, and is designed to selectively discharge oil from either the first oil outlet 130b or the second oil outlet 130c. This design allows for low-temperature operation, where oil is discharged from the second oil outlet 130c of the oil pump 130 and enters the cooling oil circuit 110 without passing through the oil cooler 120. This reduces oil flow resistance, accelerates oil temperature rise to reduce oil viscosity, minimizes resistance loss, and enables rapid warm-up of the electric drive assembly 1000, improving starting performance. Conversely, under high-temperature operation, oil is discharged from the first oil outlet 130b of the oil pump 130, cooled by the oil cooler 120, and then sent to the electric drive component 10, ensuring that the operating temperature of the electric drive component 10 remains within a safe range, guaranteeing its operational safety and reliability. The oil cooling system 100 balances cooling requirements under different operating conditions with energy consumption optimization, improving the overall efficiency of the oil cooling system 100.

[0065] In some embodiments, the oil cooling system 100 further includes a first pipeline 140 and a first check valve 150. The first pipeline 140 is connected to the first oil outlet 130b and the input end of the oil cooler 120. The first check valve 150 is installed on the first pipeline 140, and the first check valve 150 is a passage along the direction from the first oil outlet 130b to the oil cooler 120.

[0066] One end of the first pipeline 140 is connected to the first oil outlet 130b, and the other end is connected to the input end of the oil cooler 120. It is used to transport the oil discharged from the first oil outlet 130b to the oil cooler 120 for cooling. The first check valve 150 is installed on the first pipeline 140, and its conduction direction matches the oil delivery direction. That is, along the direction from the first oil outlet 130b to the oil cooler 120, the first check valve 150 is in a pass state, ensuring that the oil flows smoothly to the oil cooler 120; along the direction from the oil cooler 120 to the first oil outlet 130b, the first check valve 150 is in a closed state, which can prevent the oil from flowing backward.

[0067] After the first check valve 150 is set, on the one hand, when the oil pump 130 discharges oil from the second oil outlet 130c, the first check valve 150 can ensure that all the oil output from the second oil outlet 130c enters the cooling oil circuit 110, preventing the oil in the cooling oil circuit 110 from flowing back into the oil cooler 120 due to pressure, thereby meeting the needs of the electric drive component 10 for uncooled oil; on the other hand, the first check valve 150 can isolate the pressure fluctuations on the oil cooler 120 side caused by changes in operating conditions, preventing them from being transmitted to the first pipeline 140 and the oil pump 130, thereby ensuring the stability of the oil circuit pressure and effectively ensuring the stability of oil delivery.

[0068] In some embodiments, the oil cooling system 100 further includes a second pipeline 160 and a second check valve 170. The second pipeline 160 is connected to the second oil outlet 130c and the input end of the cooling oil passage 110. The second check valve 170 is installed on the second pipeline 160, and is a passage along the direction from the second oil outlet 130c to the cooling oil passage 110.

[0069] One end of the second pipeline 160 is connected to the second oil outlet 130c, and the other end is connected to the input end of the cooling oil circuit 110. It is used to transport the oil discharged from the second oil outlet 130c to the cooling oil circuit 110, directly providing the electric drive component 10 with oil that has not passed through the oil cooler 120. The second check valve 170 is installed on the second pipeline 160, and its conduction direction matches the oil delivery direction. That is, along the direction from the second oil outlet 130c to the cooling oil circuit 110, the second check valve 170 is in the open state, ensuring that the oil flows smoothly into the cooling oil circuit 110; along the direction from the cooling oil circuit 110 to the second oil outlet 130c, the second check valve 170 is in the closed state, which can prevent the oil from flowing backward.

[0070] With the second check valve 170 installed, on the one hand, when the oil pump 130 discharges oil from the first oil outlet 130b, the oil cooled by the oil cooler 120 enters the cooling oil circuit 110. The second check valve 170 can direct all the oil to the electric drive component 10, preventing the oil from being diverted to the second pipeline 160 due to pressure changes in the cooling oil circuit 110, thereby meeting the cooling oil requirements of the electric drive component 10. On the other hand, the second check valve 170 can isolate the pressure fluctuations on the cooling oil circuit 110 caused by changes in the operating conditions of the electric drive component 10 (such as load fluctuations and speed changes), preventing them from being transmitted to the second pipeline 160 and the oil pump 130, thereby ensuring the stable output pressure of the oil pump 130, preventing oil stagnation in the second pipeline 160, and effectively improving the stability and reliability of the oil delivery in the entire oil cooling system 100.

[0071] In some embodiments, the oil cooling system 100 further includes a first pipeline 140, a first check valve 150, a second pipeline 160, and a second check valve 170. The first pipeline 140 is connected to the first oil outlet 130b and the input end of the oil cooler 120; the first check valve 150 is installed on the first pipeline 140, and is open along the direction from the first oil outlet 130b to the oil cooler 120. The second pipeline 160 is connected to the second oil outlet 130c and the input end of the cooling oil passage 110; the second check valve 170 is installed on the second pipeline 160, and is open along the direction from the second oil outlet 130c to the cooling oil passage 110.

[0072] Figure 3 The direction indicated by arrow a is the first rotation direction, and the direction indicated by arrow b is the second rotation direction. For example... Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the oil pump 130 includes a pump housing 131, an outer rotor 132, and an inner rotor 133. The pump housing 131 has a mounting cavity 130d, an oil inlet 130a, a first oil outlet 130b, and a second oil outlet 130c. Along the axial direction of the pump housing 131, the projections of the oil inlet 130a, the first oil outlet 130b, and the second oil outlet 130c on the pump housing 131 are spaced apart circumferentially around the pump housing 131. The outer rotor 132 is rotatably disposed within the mounting cavity 130d. The inner rotor 133 is rotatably disposed within the outer rotor 132, meshes with the outer rotor 132, and is eccentrically disposed, with the number of teeth of the inner rotor 133 being less than the number of teeth of the outer rotor 132. An oil suction cavity 133a and an oil pressure cavity 133b are formed between the outer rotor 132 and the inner rotor 133. The oil inlet 130a is connected to the oil suction chamber 133a, and the first oil outlet 130b and the second oil outlet 130c are both connected to the oil pressure chamber 133b. When the inner rotor 133 rotates in a first rotation direction, the oil entering through the oil inlet 130a is discharged through the first oil outlet 130b; when the inner rotor 133 rotates in a second rotation direction, the oil entering through the oil inlet 130a is discharged through the second oil outlet 130c. The first and second rotation directions are opposite.

[0073] In these embodiments, the oil pump 130 is a cycloidal gear pump. The outer rotor 132 is disposed within the mounting cavity 130d and can rotate within it. The inner rotor 133 is located within the outer rotor 132 and can rotate within it. The axes of the outer rotor 132 and the inner rotor 133 are eccentrically arranged, meaning their axes are not coaxial. The outer rotor 132 has more teeth than the inner rotor 133. In some embodiments, the number of teeth on the outer rotor 132 is n, and the number of teeth on the inner rotor 133 is n-1, where n is an integer and greater than 4. An oil suction chamber 133a and an oil pressure chamber 133b are formed between the inner rotor 133 and the outer rotor 132. The oil suction chamber 133a communicates with the oil inlet 130a, allowing the oil entering through the oil inlet 130a to reach the oil suction chamber 133a.

[0074] It should be noted that when the cycloidal gear pump is in use, the external drive shaft drives the inner rotor 133 to rotate. Since the inner rotor 133 meshes with the outer rotor 132, the rotation of the inner rotor 133 also drives the outer rotor 132 to rotate together. When the inner rotor 133 and the outer rotor 132 rotate, under the combined action of the inner rotor 133 and the outer rotor 132, a negative pressure is formed in the oil suction chamber 133a, and the oil will be drawn into the oil suction chamber 133a through the oil inlet 130a; a positive pressure is formed in the oil pressure chamber 133b, and the oil will be gradually discharged through the first oil outlet 130b or the second oil outlet 130c connected to the oil pressure chamber 133b.

[0075] The oil is discharged either through the first oil outlet 130b or the second oil outlet 130c, depending on the rotation direction of the inner rotor 133. Specifically, the oil pressure chamber 133b can be divided into a first oil pressure chamber 133b1 and a second oil pressure chamber 133b2. The first oil outlet 130b is connected to the first oil pressure chamber 133b1, and the second oil outlet 130c is connected to the second oil pressure chamber 133b2. When the inner rotor 133 rotates in the first rotation direction under the drive of the external output shaft, the oil entering from the oil inlet 130a first enters the suction chamber 133a, and then, under the combined action of the inner rotor 133 and the outer rotor 132, enters the first oil pressure chamber 133b1, and is finally discharged through the first oil outlet 130b. It should be noted that when the inner rotor 133 rotates in the first rotation direction, the second oil pressure chamber 133b2 switches to become part of the suction chamber 133a, and the oil will also be sucked into the second oil pressure chamber 133b2. When the inner rotor 133 rotates in the second rotation direction under the drive of the external output shaft, the oil entering from the oil inlet 130a first enters the oil suction chamber 133a, and then, under the combined action of the inner rotor 133 and the outer rotor 132, enters the second oil pressure chamber 133b2, and is finally discharged through the second oil outlet 130c. It should be noted that when the inner rotor 133 rotates in the second rotation direction, the first oil pressure chamber 133b1 switches to become part of the oil suction chamber 133a, and the oil will also be sucked into the first oil pressure chamber 133b1.

[0076] Cycloidal gear pumps in related technologies typically have only one inlet and one outlet. Oil enters through the inlet 130a and exits through the outlet. Some cycloidal gear pumps in related technologies have an inner rotor that can rotate clockwise or counterclockwise, but this only changes the direction of oil flow; for example, when rotating clockwise, oil enters through the inlet and exits through the outlet; when rotating counterclockwise, oil enters through the outlet and exits through the inlet 130a. The cycloidal gear pump provided in this embodiment, through its two outlet designs, allows oil to be discharged from different outlets when the inner rotor 133 rotates in different directions. This achieves selective discharge of oil from either the first outlet 130b or the second outlet 130c, simplifying the structure of the pump 130.

[0077] It should be noted that the type of oil pump 130 in this embodiment is a cycloidal gear pump. For cycloidal gear pumps, the tooth profile and matching relationship of the inner rotor 133 and the outer rotor 132 are diverse and known to those skilled in the art. Therefore, they will not be described or limited in this application.

[0078] In some embodiments, the oil pump 130 further includes a bearing sleeved on the outer rotor 132, the bearing being located between the outer rotor 132 and the inner peripheral wall of the pump housing 131, for supporting the outer rotor 132 and allowing the outer rotor 132 to rotate within the mounting cavity 130d.

[0079] like Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, the pump housing 131 also has a first oil outlet groove 130e and a second oil outlet groove 130f. The first oil outlet groove 130e and the second oil outlet groove 130f are located on both sides of the outer rotor 132 along the axial direction and are arranged opposite to each other. They are both connected to the oil pressure chamber 133b, and the first oil outlet 130b is connected to the first oil outlet groove 130e.

[0080] The first oil pressure chamber 133b1 is located between the first oil outlet groove 130e and the second oil storage groove 200a. When oil is forced into the first oil pressure chamber 133b1 through the oil suction chamber 133a, the oil can be contained in the first oil storage groove 200a and the second oil outlet groove 130f, and discharged through the first oil outlet 130b connecting the first oil outlet groove 130e. The first oil outlet groove 130e and the second oil outlet groove 130f provide oil containing space for the first oil pressure chamber 133b1, avoiding a sudden increase in oil pressure due to insufficient local volume when the inner rotor 133 and the outer rotor 132 are meshing and pressing oil, thus playing a pressure buffering role and ensuring the stability of the oil output pressure.

[0081] In some embodiments, the pump housing 131 further has a third oil outlet groove 130g and a fourth oil outlet groove 130h. The third oil outlet groove 130g and the fourth oil outlet groove 130h are located on both sides of the outer rotor 132 along the axial direction and are arranged opposite to each other. They are both connected to the oil pressure chamber 133b, and the second oil outlet 130c is connected to the third oil outlet groove 130g.

[0082] The second oil pressure chamber 133b2 is located between the third oil outlet 130g and the fourth oil storage tank 200a. When oil is forced into the second oil pressure chamber 133b2 through the oil suction chamber 133a, the oil can be contained in the third oil storage tank 200a and the fourth oil outlet 130h, and discharged through the second oil outlet 130c on the third oil outlet 130g. The third oil outlet 130g and the fourth oil outlet 130h provide sufficient oil storage space for the second oil pressure chamber 133b2, avoiding a sudden increase in oil pressure due to insufficient local volume when the inner rotor 133 and the outer rotor 132 are meshing and pressing oil, thus playing a pressure buffering role and ensuring the stability of the oil output pressure.

[0083] Understandably, the oil pump 130 may also include two check valves respectively installed at the first oil outlet 130b and the second oil outlet 130c. The check valve at the first oil outlet 130b only allows oil to be discharged from the first oil outlet 130b and does not allow oil to enter from the first oil outlet 130b. Similarly, the check valve at the second oil outlet 130c only allows oil to be discharged from the second oil outlet 130c and does not allow oil to enter from the second oil outlet 130c. With this design, when the inner rotor 133 rotates around the first rotation direction, the oil suction chamber 133a draws in oil, and the oil will not enter from the second oil outlet 130c, but only from the oil inlet 130a, thus avoiding oil backflow in the second pipeline 160. Similarly, when the inner rotor 133 rotates around the second rotation direction, the oil suction chamber 133a sucks in oil, and the oil does not enter from the first oil outlet 130b, but only from the oil inlet 130a, thus avoiding the backflow of oil in the first pipeline 140.

[0084] Understandably, when a first check valve 150 is installed on the first pipeline 140, a check valve may not be installed at the first oil outlet 130b. The first check valve 150 prevents oil from flowing back through the first oil outlet 130b. Similarly, when a second check valve 170 is installed on the second pipeline 160, a check valve may not be installed at the second oil outlet 130c. The second check valve 170 prevents oil from flowing back through the second oil outlet 130c.

[0085] In some embodiments, the pump housing 131 further includes a first oil outlet groove 130e, a second oil outlet groove 130f, a third oil outlet groove 130g, and a fourth oil outlet groove 130h. The first oil outlet groove 130e and the second oil outlet groove 130f are located on opposite sides of the outer rotor 132 along the axial direction and are arranged opposite to each other. Both are connected to the oil pressure chamber 133b, and the first oil outlet 130b is connected to the first oil outlet groove 130e. The third oil outlet groove 130g and the fourth oil outlet groove 130h are located on opposite sides of the outer rotor 132 along the axial direction and are arranged opposite to each other. Both are connected to the oil pressure chamber 133b, and the second oil outlet 130c is connected to the third oil outlet groove 130g.

[0086] In some embodiments, the pump housing 131 further has an oil inlet groove 130i, the oil inlet groove 130i and the oil inlet 130a are respectively located on both sides of the outer rotor 132 along the axial direction and are arranged opposite to each other, and the oil inlet groove 130i is connected to the oil suction chamber 133a.

[0087] When the oil is drawn into the suction chamber 133a through the oil inlet 130a, the oil can be contained in the oil inlet groove 130i. The oil inlet groove 130i provides additional oil storage space for the suction chamber 133a, which can buffer the pressure fluctuation caused by the sudden change in volume of the suction chamber 133a, reduce the instantaneous peak value of local negative pressure, and reduce the impact noise during the oil flow process.

[0088] like Figure 3 and Figure 5 As shown, in some embodiments, the pump housing 131 includes a pump housing 1311 and a pump cover 1312. The pump housing 1311 has a first oil outlet 130b, a first oil outlet groove 130e, a fourth oil outlet groove 130h, and an oil inlet groove 130i. The pump cover 1312 is connected to the pump housing 1311 and forms an installation cavity 130d. The pump cover 1312 has an oil inlet 130a, a second oil outlet groove 130f, and a third oil outlet groove 130g.

[0089] The pump housing 1311 and the pump cover 1312 are fixedly and sealed together. This connection can be achieved through bolts, snap-fitting, welding, or other methods, and can be sealed by using a sealing ring or sealant between them. Designing the pump housing 131 as two separate parts (pump housing 1311 and pump cover 1312) allows for individual machining of the two components. After individual machining, they are then assembled to form the pump housing 131, reducing machining difficulty and improving machining efficiency.

[0090] like Figure 3 and Figure 6As shown, in some embodiments, the pump housing 1311 has a first inner bottom wall 1311a and a first outer peripheral wall 1311b. The oil inlet groove 130i, the fourth oil outlet groove 130h, and the first oil outlet groove 130e are all formed on the first inner bottom wall 1311a and are spaced apart circumferentially along the pump housing 1311. The first oil outlet 130b is formed on the first outer peripheral wall 1311b.

[0091] like Figure 8 As shown, in some embodiments, the pump cover 1312 has a second inner bottom wall 1312a opposite to the first inner bottom wall 1311a, and the pump cover 1312 also has a second outer peripheral wall 1312b. An oil inlet 130a, a second oil outlet groove 130f, and a third oil outlet groove 130g are formed on the second inner bottom wall 1312a and are spaced apart circumferentially along the pump cover 1312. A second oil outlet 130c is formed on the second outer peripheral wall 1312b.

[0092] In some embodiments, the outer rotor 132 and the inner rotor 133 are both located between the first inner bottom wall 1311a and the second inner bottom wall 1312a, and the two end faces of the outer rotor 132 along the axial direction are respectively attached to the first inner bottom wall 1311a and the second inner bottom wall 1312a, and the two end faces of the inner rotor 133 along the axial direction are also respectively attached to the first inner bottom wall 1311a and the second inner bottom wall 1312a. The first inner bottom wall 1311a and the second inner bottom wall 1312a limit the axial position of the outer rotor 132 and the inner rotor 133.

[0093] like Figure 3 As shown, in some embodiments, the pump housing 1311 is provided with a clearance hole 131a for avoiding the drive shaft, and one end of the drive shaft is located in the mounting cavity 130d through the clearance hole 131a and connected to the inner rotor 133.

[0094] like Figure 9 As shown, based on the same concept, this application also provides an electric drive assembly 1000, which includes: a housing assembly 200, a motor 300, a reducer 400, and an oil cooling system 100. The motor 300 and the reducer 400 are both mounted within the housing assembly 200. The cooling oil passage 110 of the oil cooling system 100 supplies oil to both the motor 300 and the reducer 400.

[0095] The motor 300 and the reducer 400 are electric drive components 10 to be cooled. The cooling oil passage 110 of the oil cooling system 100 supplies oil to both the motor 300 and the reducer 400 to cool and lubricate them. Since the electric drive assembly 1000 includes the aforementioned oil cooling system 100, it naturally possesses all the beneficial effects of the oil cooling system 100, which will not be elaborated upon here.

[0096] The housing assembly 200 provides support and protection for the internal motor 300 and reducer 400, and can be made of lightweight and thermally conductive materials such as aluminum alloy. Lightweight construction meets the overall vehicle weight reduction requirements, while high thermal conductivity helps dissipate the heat generated by the motor 300 and reducer 400 during operation.

[0097] The housing assembly 200 has a motor mounting cavity 200b, a reducer mounting cavity 200c, and an oil reservoir 200a. The motor 300 is mounted in the motor mounting cavity 200b, and the reducer 400 is mounted in the reducer mounting cavity 200c. The motor mounting cavity 200b and the reducer mounting cavity 200c are connected, allowing the output shaft of the motor 300 to connect to the input shaft of the reducer 400, enabling the motor 300 to drive the reducer 400 to rotate. The oil reservoir 200a stores oil. The oil pump 130 draws oil from the oil reservoir 200a and delivers it to the motor 300 and the reducer 400, providing lubrication for both. Simultaneously, the oil circulation absorbs heat from both components, aiding in cooling.

[0098] In some embodiments, the housing assembly 200 includes a motor half-housing 210, an integrated housing 220, and a reducer half-housing 230 connected in sequence, and also includes an oil pan 240. The oil pan 240 has an oil reservoir 200a. The integrated housing 220 and the reducer half-housing 230 together form a reducer mounting cavity 200c, and the integrated housing 220 and the motor half-housing 210 together form a motor mounting cavity 200b; the oil pan 240 is disposed below the integrated housing 220 and is detachably connected to the integrated housing 220.

[0099] The housing assembly 200 comprises four parts: a reducer half-house 230, an integrated housing 220, a motor half-house 210, and an oil pan 240. This allows each of the reducer half-house 230, integrated housing 220, motor half-house 210, and oil pan 240 to be manufactured independently before being assembled into the housing assembly 200. This helps reduce the manufacturing difficulty and cost of the housing assembly 200. It is understood that both the reducer half-house 230 and the motor half-house 210 are detachably connected to the integrated housing 220, allowing them to be disassembled separately for convenient maintenance of components such as the motor 300 and the reducer 400.

[0100] In some embodiments, a flow channel is provided on the housing assembly 200, which forms the cooling oil passage 110 of the oil cooling system 100.

[0101] In other words, the reducer half-shell 230, integrated shell 220, motor half-shell 210, and oil pan 240 of the housing assembly 200 have internal flow channels that form cooling oil passages 110 to deliver oil to the motor 300, reducer 400, etc. With this design, the oil cooling system 100 no longer needs to have separate pipes to form the cooling oil passages 110. Instead, the cooling oil passages 110 are integrated into the housing assembly 200, which improves the integration of the oil cooling system 100 and helps to reduce the size of the electric drive assembly 1000.

[0102] In some embodiments, the housing assembly 200 has an oil reservoir 200a, the oil inlet of the oil reservoir 200a is connected to the output end of the cooling oil circuit 110, and the oil outlet of the oil reservoir 200a is connected to the oil inlet 130a of the oil pump 130 of the oil cooling system 100. The oil reservoir 200a is used to store the oil output from the cooling oil circuit 110.

[0103] The oil is initially stored in the oil reservoir 200a. When the oil pump 130 starts, its inlet 130a draws oil from the reservoir 200a, pressurizes it, and then selectively delivers it according to operating conditions. Under low oil temperature conditions, the oil enters the cooling oil circuit 110 directly from the second outlet 130c; under high oil temperature conditions, the oil enters the oil cooler 120 from the first outlet 130b for cooling, and then flows into the cooling oil circuit 110. Subsequently, the cooling oil circuit 110 delivers the oil to the electric drive components such as the motor 300 and the reducer 400. After lubrication and cooling, the oil flows back to the oil reservoir 200a through the output end of the cooling oil circuit 110.

[0104] In some embodiments, the electric drive assembly 1000 further includes a temperature sensor 500 and a controller 600. The temperature sensor 500 is used to detect the temperature of the windings of the motor 300; the controller 600 is electrically connected to both the temperature sensor 500 and the oil pump 130, and the controller 600 controls the operation of the oil pump 130 based on the temperature collected by the temperature sensor 500, so that the oil pump 130 discharges oil through the first oil outlet 130b or through the second oil outlet 130c.

[0105] The controller 600 may be a motor controller of the electric drive assembly 1000, etc., and is not limited thereto in this application. The temperature sensor 500 is installed next to the stator winding of the motor 300 to detect the temperature of the stator winding in real time and output a temperature signal. The controller 600 is electrically connected to the temperature sensor 500 to receive the temperature signal. The controller 600 is also electrically connected to the oil pump 130 and can control the oil pump 130 to switch to the first oil outlet 130b or the second oil outlet 130c to discharge oil based on the comparison result between the temperature value collected by the temperature sensor 500 and a preset threshold. When the detected stator winding temperature is higher than the preset threshold, the controller 600 controls the oil pump 130 to switch to the first oil outlet 130b to discharge oil, so that the oil is cooled by the oil cooler 120 and then delivered to the motor 300 and the reducer 400; when the detected stator winding temperature is lower than the preset threshold, the controller 600 controls the oil pump 130 to switch to the second oil outlet 130c to discharge oil, so that the oil is delivered directly to the motor 300 and the reducer 400 without passing through the oil cooler 120, thereby achieving targeted cooling and thermodynamic regulation.

[0106] In some embodiments, when the temperature value detected by the temperature sensor 500 is ≥40°C, the controller 600 controls the oil pump 130 to switch to the first oil outlet 130b to discharge oil, so that the oil is cooled by the oil cooler 120 and then delivered to the motor 300 and the reducer 400; when the temperature value detected by the temperature sensor 500 is <40°C, the controller 600 controls the oil pump 130 to switch to the second oil outlet 130c to discharge oil, so that the oil is delivered directly to the motor 300 and the reducer 400 without passing through the oil cooler 120.

[0107] Based on the same concept, embodiments of this application also provide a vehicle, including the oil cooling system 100 or the electric drive assembly 1000 described above.

[0108] Since the vehicle includes the aforementioned oil cooling system 100, it naturally possesses all the beneficial effects of the oil cooling system 100, which will not be elaborated upon here.

[0109] The types of vehicles are diverse, including passenger cars, commercial vehicles, etc., and are not limited in this application.

[0110] The term "multiple" in this document refers to two or more. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects. Additionally, it should be understood that in the description of the embodiments of this application, terms such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0111] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0112] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. An oil cooling system, characterized in that, include: Cooling oil passage (110) is used to deliver oil to the electric drive components (10) to be cooled; An oil cooler (120) is provided, the output end of which is connected to the input end of the cooling oil circuit (110), and the oil cooler (120) is used to cool the oil. The oil pump (130) has an oil inlet (130a), a first oil outlet (130b), and a second oil outlet (130c). The oil entering the oil pump (130) through the oil inlet (130a) can be selectively discharged from the first oil outlet (130b) or from the second oil outlet (130c). The first oil outlet (130b) is connected to the input end of the oil cooler (120), and the second oil outlet (130c) is connected to the input end of the cooling oil circuit (110).

2. The oil cooling system according to claim 1, characterized in that, The oil cooling system (100) also includes: The first pipeline (140) is connected to the first oil outlet (130b) and the input end of the oil cooler (120); A first check valve (150) is installed in the first pipeline (140) along the direction from the first oil outlet (130b) to the oil cooler (120), and the first check valve (150) is a passage. And / or, The oil cooling system (100) also includes: The second pipeline (160) is connected to the second oil outlet (130c) and the input end of the cooling oil circuit (110); The second check valve (170) is installed in the second pipeline (160) and is a passage along the direction from the second oil outlet (130c) to the cooling oil passage (110).

3. The oil cooling system according to claim 1, characterized in that, The oil pump (130) includes: The pump housing (131) has a mounting cavity (130d), an oil inlet (130a), a first oil outlet (130b), and a second oil outlet (130c); along the axial direction of the pump housing (131), the projections of the oil inlet (130a), the first oil outlet (130b), and the second oil outlet (130c) on the pump housing (131) are spaced apart circumferentially around the pump housing (131); The outer rotor (132) is rotatably disposed within the mounting cavity (130d); An inner rotor (133) is rotatably disposed within the outer rotor (132), meshes with the outer rotor (132) and is eccentrically disposed therein, the number of teeth of the inner rotor (133) is less than the number of teeth of the outer rotor (132); an oil suction chamber (133a) and an oil pressure chamber (133b) are formed between the outer rotor (132) and the inner rotor (133); the oil inlet (130a) is connected to the oil suction chamber (133a), and the first oil outlet (130b) and the second oil outlet (130c) are both connected to the oil pressure chamber (133b). When the inner rotor (133) rotates in the first rotation direction, the oil entering from the oil inlet (130a) is discharged through the first oil outlet (130b); when the inner rotor (133) rotates in the second rotation direction, the oil entering from the oil inlet (130a) is discharged through the second oil outlet (130c); the first rotation direction and the second rotation direction are opposite.

4. The oil cooling system according to claim 3, characterized in that, The pump casing (131) also has a first oil outlet groove (130e) and a second oil outlet groove (130f), the first oil outlet groove (130e) and the second oil outlet groove (130f) are respectively located on both sides of the outer rotor (132) along the axial direction and are arranged opposite to each other, and both are connected to the oil pressure chamber (133b), the first oil outlet (130b) is connected to the first oil outlet groove (130e); and / or, The pump casing (131) also has a third oil outlet groove (130g) and a fourth oil outlet groove (130h). The third oil outlet groove (130g) and the fourth oil outlet groove (130h) are located on both sides of the outer rotor (132) along the axial direction and are arranged opposite to each other. Both are connected to the oil pressure chamber (133b). The second oil outlet (130c) is connected to the third oil outlet groove (130g).

5. The oil cooling system according to claim 4, characterized in that, The pump housing (131) also has an oil inlet groove (130i), the oil inlet groove (130i) and the oil inlet (130a) are located on both sides of the outer rotor (132) along the axial direction and are arranged opposite to each other. The oil inlet groove (130i) is connected to the oil suction chamber (133a).

6. The oil cooling system according to claim 5, characterized in that, The pump casing (131) includes: The pump housing (1311) has the first oil outlet (130b), the first oil outlet groove (130e), the fourth oil outlet groove (130h) and the oil inlet groove (130i). The pump cover (1312) is connected to the pump housing (1311) and forms the mounting cavity (130d). The pump cover (1312) has the oil inlet (130a), the second oil outlet groove (130f) and the third oil outlet groove (130g).

7. An electric drive assembly, characterized in that, include: Housing assembly (200); The motor (300) is installed within the housing assembly (200); A speed reducer (400) is installed within the housing assembly (200); The oil cooling system (100) according to any one of claims 1-6, wherein the cooling oil passage (110) of the oil cooling system (100) supplies oil to both the motor (300) and the reducer (400).

8. The electric drive assembly according to claim 7, characterized in that, A flow channel is provided on the housing assembly (200), which forms the cooling oil passage (110) of the oil cooling system (100).

9. The electric drive assembly according to claim 7, characterized in that, The housing assembly (200) has an oil reservoir (200a), the oil inlet of which is connected to the output of the cooling oil circuit (110); the oil outlet of which is connected to the oil inlet (130a) of the oil cooling system (100); the oil reservoir (200a) is used to store the oil output from the cooling oil circuit (110).

10. The electric drive assembly according to claim 7, characterized in that, The electric drive assembly (1000) also includes: A temperature sensor (500) is used to detect the temperature of the windings of the motor (300); The controller (600) is electrically connected to both the temperature sensor (500) and the oil pump (130). The controller (600) controls the operation of the oil pump (130) based on the temperature collected by the temperature sensor (500) so that the oil pump (130) discharges oil through the first oil outlet (130b) or through the second oil outlet (130c).

11. A vehicle, characterized in that, It includes the oil cooling system (100) according to any one of claims 1-6 or the electric drive assembly (1000) according to any one of claims 7-10.

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