Dual-motor drive assembly with cooling and lubrication system

Abstract

This application provides a dual-motor drive assembly with a cooling and lubrication system, including the cooling and lubrication system, a first motor, and a second motor. Both the first and second motors include a stator, a rotor, a motor shaft, bearings, and a reduction mechanism. The rotor is ringed around the outer circumference of the motor shaft, and the stator is ringed around the outer circumference of the rotor. The motor shaft is drively connected to the reduction mechanism, and both the motor shaft and the reduction mechanism are equipped with matching bearings. The cooling and lubrication system includes a first drive pump, a second drive pump, a first oil passage, and a second oil passage. The first drive pump provides lubricating oil to the first oil passage, which is used for cooling and lubricating the first motor. The second drive pump provides lubricating oil to the second oil passage, which is used for cooling and lubricating the second motor. Both the first and second oil passages include multiple branches, which are used to cool and lubricate the stator, rotor, motor shaft, bearings, and reduction mechanism, respectively. This configuration improves the lubrication effect of the dual-motor drive assembly.

Description

Technical Field

[0001] This application relates to the field of cooling system technology, and in particular to a dual-motor drive assembly with a cooling and lubrication system. Background Technology

[0002] Currently, with the rapid development of the new energy vehicle market, the demand for integrated and efficient electric drive systems is increasing. In the current market, in addition to the traditional single-motor architecture, dual-motor architectures suitable for mid-size and large vehicles, high-performance vehicles, and off-road vehicles are also flourishing.

[0003] Dual-motor drive assemblies have a higher degree of integration than single-motor drive assemblies. The motor and reducer drive assemblies, as core components, place higher demands on the cooling and lubrication system. In existing technologies, the motor rotor and stator of a dual-motor drive assembly are cooled by forced oil spraying through internal oil circuits and pipes, while the reducer bearings and gears are lubricated by oil splashing. This makes it difficult to independently control the lubricating oil flow of both motors simultaneously, failing to meet the varying flow requirements under different motor loads. This can easily lead to poor lubrication and hinder improvements in the cooling and lubrication system and the overall efficiency of the dual-motor drive assembly. Summary of the Invention

[0004] In view of this, this application provides a dual-motor drive assembly with a cooling and lubrication system to improve the lubrication effect of the dual-motor drive assembly.

[0005] Specifically, the following technical solutions are included:

[0006] This application provides a dual-motor drive assembly with a cooling and lubrication system. The dual-motor drive assembly includes a cooling and lubrication system, a first motor, and a second motor. Both the first motor and the second motor include a stator, a rotor, a motor shaft, and a reduction mechanism. The rotor is arranged in a ring around the outer periphery of the motor shaft, and the stator is arranged in a ring around the outer periphery of the rotor. The motor shaft is drivenly connected to the reduction mechanism, and both the motor shaft and the reduction mechanism are provided with matching bearings.

[0007] The cooling and lubrication system includes a first drive pump, a second drive pump, a first oil passage, and a second oil passage. The first drive pump is used to provide lubricating oil to the first oil passage, and the first oil passage is used to cool and lubricate the first motor. The second drive pump is used to provide lubricating oil to the second oil passage, and the second oil passage is used to cool and lubricate the second motor.

[0008] Both the first oil passage and the second oil passage include multiple branches, which are used to cool and lubricate the stator, the rotor, the motor shaft, the bearing, and the reduction mechanism, respectively.

[0009] In one optional embodiment, both the first oil passage and the second oil passage include a first distribution branch and a second distribution branch, wherein the first distribution branch is used to supply oil to the stator and the second distribution branch is used to supply oil to the reduction mechanism.

[0010] In one optional embodiment, the reduction mechanism includes a first gear pair, a connecting shaft, and a second gear pair. The first gear pair includes a first gear and a second gear that mesh with each other, and the first gear is coaxially connected to the motor shaft. The second gear pair includes a third gear and a fourth gear that mesh with each other, and the third gear and the second gear are coaxially connected to the connecting shaft.

[0011] The second oil passage includes a first motor branch and a second motor branch. The first motor branch is used to supply oil to the third gear of the first motor and / or the bearing that is paired with the third gear. The second motor branch is used to supply oil to the fourth gear of the first motor and / or the bearing that is paired with the fourth gear.

[0012] In one alternative embodiment, the oil inlet of the second cross-motor branch is located at the stator of the second motor to receive lubricating oil flowing down from the first distribution branch of the second oil passage.

[0013] In one optional embodiment, the first oil passage includes a third motor branch and a fourth motor branch, wherein the third motor branch is used to supply oil to the third gear and / or the bearing of the third gear, and the fourth motor branch is used to supply oil to the fourth gear and / or the bearing mated with the fourth gear.

[0014] In one optional embodiment, the oil inlet of the third cross-motor branch is located at the stator of the first motor to receive lubricating oil flowing down from the first distribution branch of the first oil passage.

[0015] In one optional embodiment, the motor shaft includes a sidewall and a hollow cavity formed by the sidewall. A branch oil passage is provided on the sidewall. The extension direction of the branch oil passage is set at an angle to the axial direction of the motor shaft. The branch oil passage passes through the sidewall and communicates with the hollow cavity.

[0016] The cooling and lubrication system further includes a third oil passage, which is formed by the intersection of the first oil passage and the second oil passage. The third oil passage is connected to the hollow cavity of the first motor and the hollow cavity of the second motor, respectively, thereby supplying oil to the rotors of the first motor and the second motor and / or the bearings that are matched with the motor shaft.

[0017] In an optional embodiment, the third oil passage is also used to supply oil to the fourth gear and / or the bearing mated with the fourth gear.

[0018] In one optional embodiment, both the first oil passage and the second oil passage include at least one third distribution branch, each of the third distribution branches being used to supply oil to at least one of the bearings.

[0019] In one optional embodiment, the cooling and lubrication system further includes a first filter, a first heat exchanger, a second filter, and a second heat exchanger;

[0020] The first drive pump, the first filter, and the first heat exchanger are connected in sequence.

[0021] The second drive pump, the second filter, and the second heat exchanger are connected in sequence.

[0022] The beneficial effects of the technical solution provided in this application embodiment include at least the following: by setting a first drive pump to provide lubricating oil to the first oil passage and a second drive pump to provide lubricating oil to the second oil passage, the first oil passage cools and lubricates the first motor, and the second oil passage cools and lubricates the second motor, thereby achieving independent oil supply to the first motor and the second motor to meet the different flow requirements of the first motor and the second motor when the load is different, and reducing the power consumption of the dual-motor drive assembly; by setting multiple branches to provide multi-directional cooling and lubrication to the stator, rotor, motor shaft, bearings and reduction mechanism, the cooling and lubrication effect of the dual-motor drive assembly is effectively improved. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the cooling and lubrication system of the dual-motor drive assembly provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the dual-motor drive assembly provided in the embodiments of this application;

[0026] Figure 3 A schematic diagram of the architecture of the first oil passage provided in an embodiment of this application;

[0027] Figure 4 A schematic diagram of the architecture of the second oil passage provided in an embodiment of this application;

[0028] Figure 5This is a schematic diagram of the architecture of the third oil passage provided in an embodiment of this application.

[0029] The reference numerals in the figure indicate:

[0030] 11-First drive pump; 12-Second drive pump; 21-First oil passage; 211-First distribution branch; 212-Second distribution branch; 213-Third distribution branch; 214-Third cross-motor branch; 215-Fourth cross-motor branch; 22-Second oil passage; 221-First cross-motor branch; 222-Second cross-motor branch; 23-Third oil passage;

[0031] 100-First motor; 200-Second motor; 101-Stator; 102-Rotor; 103-Motor shaft; 1031-Hollow cavity; 104-Connecting shaft; 1051-First gear; 1052-Second gear; 1053-Third gear; 1054-Fourth gear; 1061-First bearing; 1062-Second bearing; 1063-Third bearing; 1064-Fourth bearing; 1065-Fifth bearing; 1066-Sixth bearing; 1071-First filter; 1072-Second filter; 1081-First heat exchanger; 1082-Second heat exchanger; 109-Oil tank.

[0032] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0035] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. Some technical terms appearing in the embodiments of this application are described below.

[0036] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0037] This application provides a dual-motor drive assembly with a cooling and lubrication system, such as... Figure 1 and Figure 2 As shown, the dual-motor drive assembly includes a cooling and lubrication system, a first motor 100, and a second motor 200. Both the first motor 100 and the second motor 200 include a stator 101, a rotor 102, a motor shaft 103, and a reduction mechanism. The rotor 102 is arranged around the outer periphery of the motor shaft 103, and the stator 101 is arranged around the outer periphery of the rotor 102 and spaced apart from the rotor 102. The motor shaft 103 is connected to the reduction mechanism for transmission, and both the motor shaft 103 and the reduction mechanism are equipped with matching bearings.

[0038] like Figure 1 As shown, the cooling and lubrication system includes a first drive pump 11, a second drive pump 12, a first oil passage 21, and a second oil passage 22. The first drive pump 11 is used to provide lubricating oil to the first oil passage 21, which is used to cool and lubricate the first motor 100. The second drive pump 12 is used to provide lubricating oil to the second oil passage 22, which is used to cool and lubricate the second motor 200.

[0039] The first oil passage 21 and the second oil passage 22 both include multiple branches, which are used to cool and lubricate the stator 101, rotor 102, motor shaft 103, bearings and reduction mechanism respectively.

[0040] Among them, the branch can be in the form of pipes, holes, grooves, etc., set on the housing of the dual motor drive assembly, as long as it can form a certain lubricating oil flow path.

[0041] Understandably, lubricating oil can be replaced with other fluid media used for cooling or lubrication. The type and amount of lubricating oil are set according to actual needs, ensuring that the first drive pump 11 and the second drive pump 12 can still fully draw in lubricating oil even at the defined extreme tilt positions of the dual-motor drive assembly, so as to avoid uncontrollable effects on lubricating oil distribution caused by air intake.

[0042] For example, solenoid valves are provided in the first oil passage 21 and the second oil passage 22. The opening degree of the solenoid valves can be controlled according to the working conditions and the actual temperature values ​​of the motor stator 101 and rotor 102, thereby controlling the flow rate of the lubricating oil to each branch.

[0043] The first motor 100 and the second motor 200 are two motors in a dual-motor drive assembly. The first drive pump 11 and the second drive pump 12 operate independently to provide clean and sufficient lubricating oil pressure and flow. Specifically, the first drive pump 11 outputs lubricating oil to the first oil passage 21, achieving independent cooling and lubrication of the first motor 100, while the second drive pump 12 outputs lubricating oil to the second oil passage 22, achieving independent cooling and lubrication of the second motor 200. Furthermore, the lubricating oil from the first oil passage 21 and the second oil passage 22 can cross-lubricate the components within the dual-motor drive assembly housing, improving the cooling and lubrication effect.

[0044] The first motor 100 and the second motor 200 are both mounted on the housing of the dual-motor drive assembly. The first motor 100 and the second motor 200 can be arranged symmetrically, for example... Figure 2 As shown, the first motor 100 and the second motor 200 are symmetrical about the left and right.

[0045] When the loads of the first motor 100 and the second motor 200 are different, the cooling and lubrication system provided in this application embodiment can output lubricating oil with different flow rates or pressures to the first motor 100 and the second motor 200 through the first drive pump 11 and the second drive pump 12, so as to ensure the cooling and lubrication effect and prevent the reliability and service life of the dual motor drive assembly from being affected.

[0046] The first oil passage 21 and the second oil passage 22 each form multiple branches, which can distribute the lubricating oil output by the first drive pump 11 and the second drive pump 12 to different components according to different paths, so as to fully lubricate each component. It can be understood that the above "parallel connection" means that the upstream ends of the multiple branches are connected to each other.

[0047] The cooling and lubrication system includes an oil tank 109, which is located below the first motor 100 and the second motor 200 and is used to collect lubricating oil for the first drive pump 11 and the second drive pump 12 to draw in.

[0048] The dual-motor drive assembly provided in this application embodiment provides lubricating oil to the first oil passage 21 by setting a first drive pump 11 to provide lubricating oil to the first oil passage 21 and a second drive pump 12 to provide lubricating oil to the second oil passage 22. This allows the first oil passage 21 to cool and lubricate the first motor 100, and the second oil passage 22 to cool and lubricate the second motor 200, thereby achieving independent oil supply to the first motor 100 and the second motor 200. This meets the different flow requirements of the first motor 100 and the second motor 200 under different loads, reducing the power consumption of the dual-motor drive assembly. By setting multiple branches to provide multi-directional cooling and lubrication to the stator 101, rotor 102, motor shaft 103, bearings, and reduction mechanism, the cooling and lubrication effect of the dual-motor drive assembly is effectively improved.

[0049] In one specific embodiment, both the first oil passage 21 and the second oil passage 22 include a first distribution branch 211 and a second distribution branch 212. The first distribution branch 211 is used to supply oil to the stator 101, and the second distribution branch 212 is used to supply oil to the reduction mechanism.

[0050] The first distribution branch 211 of the first oil passage 21 sprays lubricating oil onto the stator 101 of the first motor 100 to cool and lubricate the stator 101 of the first motor 100. The first distribution branch 211 of the second oil passage 22 sprays lubricating oil onto the stator 101 of the second motor 200 to cool and lubricate the stator 101 of the second motor 200.

[0051] Specifically, such as Figure 1 and Figure 3 As shown, the lubricating oil in the first distribution branch 211 is sprayed onto the surface of the stator 101, and then flows to the left and right sides of the stator 101 to the oil passage end ring. It is then sprayed from the oil hole of the oil passage end ring to the end of the winding of the stator 101 to cool the winding. Finally, the lubricating oil falls into the oil tank 109.

[0052] It is understandable that the lubricating oil flowing out from the first distribution branch 211, after falling from the surface of the stator 101, can fall onto the surface of other components to cool and lubricate them, such as the motor shaft 103 and its bearings.

[0053] In a further embodiment, the reduction mechanism includes a first gear pair, a connecting shaft 104, and a second gear pair. The first gear pair includes a first gear 1051 and a second gear 1052 that mesh with each other. The first gear 1051 is coaxially connected to the motor shaft 103. The second gear pair includes a third gear 1053 and a fourth gear 1054 that mesh with each other. The third gear 1053 and the second gear 1052 are coaxially connected to the connecting shaft 104.

[0054] Please refer to the following: Figures 1 to 3 The lubricating oil flowing out of the second distribution branch 212 is sprayed onto the surface of the third gear 1053 and flows along the axial direction of the third gear 1053 to the second gear 1052, which can cool and lubricate the first gear 1051, the second gear 1052, the second bearing 1062 and the third bearing 1063, thereby improving the cooling and lubrication efficiency.

[0055] The second oil passage 22 includes a first motor branch 221 and a second motor branch 222. The first motor branch 221 is used to supply oil to the third gear 1053 of the first motor 100 and / or the bearing that matches the third gear 1053. The second motor branch 222 is used to supply oil to the fourth gear 1054 of the first motor 100 and / or the bearing that matches the fourth gear 1054.

[0056] It is understandable that the bearing that matches the component means the bearing that is installed on the component.

[0057] For example, such as Figure 2 As shown, the motor shaft 103 of the first motor 100 and the motor shaft 103 of the second motor 200 are both equipped with a first bearing 1061 and two second bearings 1062. The first bearing 1061 and the second bearing 1062 are located on opposite axial sides of the stator 101, and the two second bearings 1062 are located on opposite axial sides of the first gear 1051. The second gear 1052 is equipped with a third bearing 1063, which is located on the side of the stator 101 closest to the motor. The third gear 1053 is equipped with a fourth bearing 1064, which is located on the side of the third gear 1053 away from the motor. The fourth gear 1054 is equipped with a fifth bearing 1065 and a sixth bearing 1066, which are located on opposite axial sides of the fourth gear 1054, with the fifth bearing 1065 located on the side of the fourth gear 1054 closest to the motor and the sixth bearing 1066 located on the side of the fourth gear 1054 away from the motor.

[0058] The first span motor branch 221 and the second span motor branch 222 are both branches of the second oil passage 22, and both are directly or indirectly supplied with oil by the second drive pump 12.

[0059] For example, such as Figure 4 As shown, the oil outlet of the first motor branch 221 is located near the third gear 1053 and the fourth bearing 1064 of the first motor 100. The lubricating oil flowing out of the first motor branch 221 sprays onto the surfaces of the third gear 1053 and the fourth bearing 1064 of the first motor 100, providing cooling and lubrication. It can be understood that during the meshing and rotation of the third gear 1053 and the fourth gear 1054, the lubricating oil flowing out of the first motor branch 221 can cool and lubricate the fourth gear 1054, and also cool and lubricate the fifth bearing 1065 and the sixth bearing 1066.

[0060] For example, such as Figure 4 As shown, the oil outlet of the second cross motor branch 222 is located near the fifth bearing 1065 of the first motor 100. The lubricating oil flowing out of the second cross motor branch 222 is sprayed onto the surface of the fifth bearing 1065 of the first motor 100 to cool and lubricate the fifth bearing 1065 of the first motor 100.

[0061] In this embodiment, by setting the first cross-motor branch 221 and the second cross-motor branch 222, cross-lubrication between the first motor 100 and the second motor 200 is achieved, which helps to improve cooling and lubrication efficiency and ensure the overall cooling and lubrication effect of the first motor 100 and the second motor 200.

[0062] In a further embodiment, the oil inlet of the second cross-motor branch 222 is located at the stator 101 of the second motor 200 to receive lubricating oil flowing down from the first distribution branch 211 of the second oil passage 22.

[0063] like Figure 4 As shown, the oil inlet of the second cross motor branch 222 is not connected in parallel with other branches of the second oil passage 22, but is located below the oil outlet of the first distribution branch 211 of the second oil passage 22. The lubricating oil flowing out from the first distribution branch 211 drips down after cooling the windings of the stator 101 and flows into the oil inlet of the second cross motor branch 222. Then it is sprayed onto the fifth bearing 1065 of the first motor 100 to cool and lubricate the fifth bearing 1065.

[0064] In this embodiment, by setting the oil inlet of the second cross-motor branch 222 at the stator 101 of the second motor 200, the lubricating oil in the second oil passage 22 can be fully utilized, the utilization rate of the lubricating oil can be improved, and the cooling and lubrication effect on the dual-motor drive assembly can be enhanced.

[0065] In a further embodiment, the first oil passage 21 includes a third cross-motor branch 214 and a fourth cross-motor branch 215, the third cross-motor branch 214 being used to supply oil to the third gear 1053 and / or the bearing mated with the third gear 1053, and the fourth cross-motor branch 215 being used to supply oil to the fourth gear 1054 and / or the bearing mated with the fourth gear 1054.

[0066] The third span motor branch 214 and the fourth span motor branch 215 are both branches of the first oil passage 21, and both are directly or indirectly supplied with oil by the first drive pump 11.

[0067] For example, such as Figure 3 As shown, the oil outlet of the third motor branch 214 is located near the fourth bearing 1064 of the second motor 200. The lubricating oil flowing from the first motor branch 221 is sprayed onto the surface of the fourth bearing 1064 of the first motor 100, providing cooling and lubrication. It can be understood that the lubricating oil flowing from the third motor branch 214 can also be sprayed onto the third gear 1053 of the second motor 200 to provide cooling and lubrication to the fourth gear 1054 during its meshing rotation with the third gear 1053. It can also provide cooling and lubrication to the fifth bearing 1065 and the sixth bearing 1066.

[0068] For example, such as Figure 3 As shown, the fourth cross motor branch 215 is located near the fifth bearing 1065 of the second motor 200. The lubricating oil flowing out of the second cross motor branch 222 is sprayed onto the surface of the fifth bearing 1065 of the first motor 100 to cool and lubricate the fifth bearing 1065 of the first motor 100.

[0069] In this embodiment, by setting the third cross-motor branch 214 and the fourth cross-motor branch 215, cross-lubrication between the first motor 100 and the second motor 200 is achieved, which helps to improve the cooling and lubrication efficiency and ensure the overall cooling and lubrication effect of the first motor 100 and the second motor 200.

[0070] In a further embodiment, the oil inlet of the third cross motor branch 214 is located at the stator 101 of the first motor 100 to receive the lubricating oil flowing down from the first distribution branch 211 of the first oil passage 21.

[0071] like Figure 3 As shown, the oil inlet of the third cross motor branch 214 is not connected in parallel with the other branches of the first oil passage 21, but is located below the oil outlet of the first distribution branch 211 of the first oil passage 21. The lubricating oil flowing out from the first distribution branch 211 drips down after cooling the windings of the stator 101 and flows into the oil inlet of the third cross motor branch 214. Then it is sprayed onto the fourth bearing 1064 of the second motor 200 to cool and lubricate the fourth bearing 1064.

[0072] In this embodiment, by setting the oil inlet of the third cross motor branch 214 at the stator 101 of the first motor 100, the lubricating oil in the first oil passage 21 can be fully utilized, the utilization rate of the lubricating oil can be improved, and the cooling and lubrication effect on the dual motor drive assembly can be enhanced.

[0073] In a further embodiment, the motor shaft 103 includes a sidewall and a hollow cavity 1031 formed by the sidewall. A branch oil passage is provided on the sidewall. The extension direction of the branch oil passage is set at an angle to the axial direction of the motor shaft 103. The branch oil passage passes through the sidewall and is connected to the hollow cavity 1031.

[0074] The cooling and lubrication system also includes a third oil passage 23, which is formed by the intersection of the first oil passage 21 and the second oil passage 22. The third oil passage 23 is connected to the hollow cavity 1031 of the first motor 100 and the hollow cavity 1031 of the second motor 200, thereby supplying oil to the rotors 102 of the first motor 100 and the second motor 200 and / or the bearings that are matched with the motor shaft 103.

[0075] Specifically, the lubricating oil in the third oil passage 23 comes from the first drive pump 11 and the second drive pump 12, and the first oil passage 21 and the second oil passage 22 converge to form the third oil passage 23.

[0076] The hollow cavity 1031 extends axially along the motor shaft 103, and has one or more branch oil passages, with the oil outlet of at least one branch oil passage located at the rotor 102. The lubricating oil flowing out from the third oil passage 23 flows to the motor shaft 103 of the first motor 100 and the motor shaft 103 of the second motor 200, flows into the hollow cavity 1031 from one end of the motor shaft 103, and flows to the rotor 102 through the branch oil passages to cool and lubricate the rotor 102.

[0077] The branch oil passage can extend radially along the motor shaft 103, or it can extend in a direction inclined to the axial direction of the motor shaft 103. For example, the extension direction of the branch oil passage is inclined to the axial direction of the motor shaft 103, and there are multiple branch oil passages. The oil outlet of at least one branch oil passage is located at the second bearing 1062 to cool and lubricate the second bearing 1062, thereby improving the cooling and lubrication efficiency of the third oil passage 23.

[0078] In a further embodiment, the third oil passage 23 is also used to supply oil to the fourth gear 1054 and / or the bearing mated with the fourth gear 1054.

[0079] For example, such as Figure 5 As shown, the third oil passage 23 has four oil outlets, two of which are located at the motor shaft 103 of the first motor 100 and the motor shaft 103 of the second motor 200, respectively, and the other two are located at the sixth bearing 1066 of the first motor 100 and the sixth bearing 1066 of the second motor 200, respectively, so as to simultaneously lubricate the sixth bearing 1066 of the first motor 100 and the sixth bearing 1066 of the second motor 200, making full use of the lubricating oil in the third oil passage 23, which helps to improve the cooling and lubrication efficiency.

[0080] In one embodiment, both the first oil passage 21 and the second oil passage 22 include at least one third distribution branch 213, each third distribution branch 213 being used to supply oil to at least one bearing.

[0081] For example, such as Figure 1 As shown, the first oil passage 21 includes two third distribution branches 213, one of which is used to force oil supply to the third bearing 1063 of the first motor 100, and the other of which is used to force oil supply to the first bearing 1061 of the first motor 100, so as to ensure the cooling and lubrication effect of the third bearing 1063 and the first bearing 1061.

[0082] For example, such as Figure 1As shown, the second oil passage 22 includes two third distribution branches 213. One third distribution branch 213 is used to force oil supply to the first bearing 1061 of the second motor 200. The other third distribution branch 213 is connected to the branch oil passage of the motor shaft 103 of the second motor 200, and the oil outlet of the third distribution branch 213 is located at the third bearing 1063 of the second motor 200. The lubricating oil flowing into the hollow cavity 1031 of the second motor 200 in the third oil passage 23 flows into the third distribution branch 213 through the branch oil passage and flows out from the third distribution branch 213, spraying onto the third bearing 1063 of the second motor 200 to cool and lubricate the third bearing 1063.

[0083] The cooling and lubrication system also includes a first filter 1071, a first heat exchanger 1081, a second filter 1072, and a second heat exchanger 1082. A first drive pump 11, the first filter 1071, and the first heat exchanger 1081 are connected in sequence. A second drive pump 12, the second filter 1072, and the second heat exchanger 1082 are connected in sequence.

[0084] The lubricating oil flowing from the first drive pump 11 flows through the first filter 1071 and the first heat exchanger 1081, and flows out downstream of the first heat exchanger 1081, branching into multiple branches to form the first oil passage 21. The lubricating oil flowing from the second drive pump 12 flows through the second filter 1072 and the second heat exchanger 1082, and flows out downstream of the second heat exchanger 1082, branching into multiple branches to form the second oil passage 22.

[0085] The first filter 1071 and the second filter 1072 are used to filter out harmful impurities in the lubricating oil pumped out by the first drive pump 11, so as to provide clean lubricating oil for the first motor 100 and the second motor 200.

[0086] The first heat exchanger 1081 and the second heat exchanger 1082 are used to cool the lubricating oil flowing out from the first filter 1071 and the second filter 1072, to ensure the cooling effect on the first motor 100 and the second motor 200, and to prevent the components in the first motor 100 and the second motor 200 from being affected by overheating and affecting normal operation.

[0087] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0088] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0089] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A dual-motor drive assembly with a cooling and lubrication system, characterized in that, The dual-motor drive assembly includes a cooling and lubrication system, a first motor (100) and a second motor (200). Both the first motor (100) and the second motor (200) include a stator (101), a rotor (102), a motor shaft (103), and a reduction mechanism. The rotor (102) is arranged around the outer periphery of the motor shaft (103), and the stator (101) is arranged around the outer periphery of the rotor (102). The motor shaft (103) is connected to the reduction mechanism. Both the motor shaft (103) and the reduction mechanism are provided with matching bearings. The cooling and lubrication system includes a first drive pump (11), a second drive pump (12), a first oil passage (21), and a second oil passage (22). The first drive pump (11) is used to provide lubricating oil to the first oil passage (21), which is used to cool and lubricate the first motor (100). The second drive pump (12) is used to provide lubricating oil to the second oil passage (22), which is used to cool and lubricate the second motor (200). Both the first oil passage (21) and the second oil passage (22) include multiple branches, which are respectively used for cooling and lubricating the stator (101), the rotor (102), the motor shaft (103), the bearing, and the reduction mechanism; both the first oil passage (21) and the second oil passage (22) include a first distribution branch (211) and a second distribution branch (212), the first distribution branch (211) is used to supply oil to the stator (101), and the second distribution branch (212) is used for... Oil is supplied to the reduction mechanism; the reduction mechanism includes a first gear pair, a connecting shaft (104), and a second gear pair. The first gear pair includes a first gear (1051) and a second gear (1052) that mesh with each other. The first gear (1051) is coaxially connected to the motor shaft (103). The second gear pair includes a third gear (1053) and a fourth gear (1054) that mesh with each other. The third gear (1053) and the second gear (1052) are coaxially connected to the connecting shaft (104). The second oil passage (22) includes a first cross-motor branch (221) and a second cross-motor branch (222). The first cross-motor branch (221) is used to supply oil to the third gear (1053) of the first motor (100) and / or the bearing that is matched with the third gear (1053). The second cross-motor branch (222) is used to supply oil to the fourth gear (1054) of the first motor (100) and / or the bearing that is matched with the fourth gear (1054). The first oil passage (21) includes a third cross motor branch (214) and a fourth cross motor branch (215). The third cross motor branch (214) is used to supply oil to the third gear (1053) and / or the bearing of the third gear (1053), and the fourth cross motor branch (215) is used to supply oil to the fourth gear (1054) and / or the bearing that is matched with the fourth gear (1054).

2. The dual-motor drive assembly according to claim 1, characterized in that, The oil inlet of the second cross motor branch (222) is located at the stator (101) of the second motor (200) to receive the lubricating oil flowing down from the first distribution branch (211) of the second oil passage (22).

3. The dual-motor drive assembly according to claim 1, characterized in that, The oil inlet of the third cross motor branch (214) is located at the stator (101) of the first motor (100) to receive the lubricating oil flowing down from the first distribution branch (211) of the first oil passage (21).

4. The dual-motor drive assembly according to claim 1, characterized in that, The motor shaft (103) includes a side wall and a hollow cavity (1031) formed by the side wall. A branch oil passage is provided on the side wall. The extension direction of the branch oil passage is set at an angle to the axial direction of the motor shaft (103). The branch oil passage passes through the side wall and is connected to the hollow cavity (1031). The cooling and lubrication system further includes a third oil passage, which is formed by the intersection of the first oil passage (21) and the second oil passage (22). The third oil passage is connected to the hollow cavity (1031) of the first motor (100) and the hollow cavity (1031) of the second motor (200) respectively, thereby supplying oil to the rotor (102) of the first motor (100) and the second motor (200) and / or the bearing that is matched with the motor shaft (103).

5. The dual-motor drive assembly according to claim 4, characterized in that, The third oil passage is also used to supply oil to the fourth gear (1054) and / or the bearing that is paired with the fourth gear (1054).

6. The dual-motor drive assembly according to claim 1, characterized in that, Both the first oil passage (21) and the second oil passage (22) include at least one third distribution branch (213), each of the third distribution branches (213) being used to supply oil to at least one of the bearings.

7. The dual-motor drive assembly according to claim 1, characterized in that, The cooling and lubrication system also includes a first filter (1071), a first heat exchanger (1081), a second filter (1072), and a second heat exchanger (1082). The first drive pump (11), the first filter (1071), and the first heat exchanger (1081) are connected in sequence; The second drive pump (12), the second filter (1072), and the second heat exchanger (1082) are connected in sequence.

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