Dual-motor power assembly of oil collection lubrication differential mechanism and vehicle

Abstract

The utility model provides a dual-motor power assembly of an oil collection lubrication differential mechanism and a vehicle. The dual-motor power assembly comprises two motors and a speed reducer. The assembly shell is used for forming a speed reducer cavity and two motor cavities. The reducer cavity is used for containing the parallel shaft gear set and the differential mechanism. The assembly shell comprises a differential shaft hole and two motor shaft holes. The cavity wall of the speed reducer cavity comprises a bearing groove and an oil collecting protrusion, and the oil collecting protrusion is used for collecting lubricating oil and guiding the lubricating oil to the differential mechanism. The distance between the center of the bearing groove and the other motor shaft hole is larger than the distance between at least one of one motor shaft hole or one differential shaft hole and the other motor shaft hole, and the oil collecting protrusions are arranged between the middle wheel or the output wheel of the parallel shaft gear set and the cavity wall of one speed reducer cavity. Under the scene of a vertical speed reducer, the oil collecting and guiding functions are integrated on the oil collecting protrusions, the service life of a differential mechanism is prolonged, the structural strength of a power assembly is improved, and driving safety is ensured.

Description

Technical Field

[0001] The present application relates to the field of powertrain, and in particular to a dual-motor powertrain and a vehicle with an oil-collecting lubricating differential. Background Art

[0002] In the new energy vehicle industry, the powertrain is the main source of power for the vehicle. Among them, the differential, as an important part of the powertrain, can achieve the left and right wheels rotating at different speeds through the cooperation of the transmission components inside the differential when the vehicle turns or drives on uneven roads. However, there is currently a problem of insufficient lubrication inside the differential, which may cause serious wear of the transmission components, reduce the service life of the differential, damage the structural strength of the powertrain, and thus affect driving safety. Utility Model Content

[0003] Embodiments of the present application provide a dual-motor powertrain and a vehicle with an oil-collecting lubrication differential.

[0004] In the first aspect, the embodiment of the present application provides a dual-motor powertrain with an oil-collecting lubricating differential. The dual-motor powertrain includes two motors and a reducer. The assembly housing of the dual-motor powertrain is used to form a reducer cavity and two motor cavities arranged in parallel. The two motor cavities are used to fix the stators of the two motors respectively, and a reducer cavity is used to accommodate a parallel shaft gear set and a differential of a reducer. Among them, the assembly housing includes a differential shaft hole and two motor shaft holes. A differential shaft hole is used to pass through a wheel drive shaft, a motor shaft hole is used to connect a motor cavity and a reducer cavity, and another motor shaft hole is used to connect another motor cavity and a reducer cavity. The cavity wall of a reducer cavity includes a bearing groove and an oil collecting protrusion. A bearing groove is used to fix the bearing of an intermediate shaft of a parallel shaft gear set, and an oil collecting protrusion is used to collect lubricating oil and guide it to a differential. The distance between the center of a bearing groove and the center of another motor shaft hole is greater than the distance between the center of at least one of a motor shaft hole or a differential shaft hole and the center of another motor shaft hole. An oil collecting protrusion is arranged between an intermediate wheel or an output wheel of a parallel shaft gear set and a cavity wall of a reducer cavity.

[0005] In the embodiment of the present application, the parallel shaft gear set and the differential are located in the reducer cavity, the cavity wall of the reducer cavity includes an oil collecting protrusion, and the differential receives the lubricating oil collected by the oil collecting protrusion to prevent serious wear of the differential. One of the sources of the lubricating oil collected by the oil collecting protrusion is the oil thrown off an intermediate wheel or an output wheel of the parallel shaft gear set.

[0006] In the implementation of this application, the position of the oil collecting protrusion needs to be coordinated with the parallel shaft gear set, and the gear arrangement of the parallel shaft gear set is affected by the layout of other internal components in the dual-motor powertrain. Therefore, it is necessary to adjust the position of the oil collecting protrusion according to the layout of the internal components of the dual-motor powertrain, otherwise it may have a negative impact on the oil collecting and oil guiding functions of the oil collecting protrusion, reducing the lubrication efficiency of the differential.

[0007] The positional relationship between the two motor cavities and the reducer cavity represents the positional relationship between the two motors and the reducer in the dual-motor powertrain, that is, the two motors are arranged in parallel on one side of the reducer. The positional relationship between the two motor shaft holes, the differential shaft hole and the bearing slot represents the layout characteristics of the reducer in the dual-motor powertrain. Specifically, the distance between the center of a bearing slot and the center of the other motor shaft hole is greater than the distance between the center of at least one of a motor shaft hole or a differential shaft hole and the center of the other motor shaft hole, indicating that the parallel shaft gear set has a transmission connection relationship with one motor. In order to avoid interference between the parallel shaft gear set and the differential of the reducer and the other motor, it is necessary to stagger the other motor and the reducer, so that the reducer presents a vertical reducer structure in the dual-motor powertrain. Among them, the vertical reducer is opposite to the horizontal reducer. The main difference between the two is not the arrangement characteristics inside the reducer, but the arrangement characteristics of the reducer as a whole inside the powertrain.

[0008] Based on the layout of the internal components of the above-mentioned dual-motor powertrain and the structure of the vertical reducer, the oil collecting protrusion in the embodiment of the present application is located between an intermediate wheel or an output wheel of a parallel shaft gear set and the wall of a reducer cavity, which is equivalent to the oil collecting protrusion being arranged in the overlapping area of ​​the axial projection of an intermediate wheel and an output wheel along the dual-motor powertrain, so that no matter whether the differential protrudes toward or away from an intermediate wheel, the oil collecting protrusion can collect part of the lubricating oil swung by the parallel shaft gear set and guide the lubricating oil to the differential.

[0009] In one embodiment, along the axial direction of the dual-motor powertrain, a motor shaft hole is used to align with an input wheel of a parallel shaft gear set, an input wheel is used to mesh with an intermediate wheel, and along the axial direction of the dual-motor powertrain, a differential shaft hole is used to align with a differential. Wherein, the distance between the center of a motor shaft hole and the center of a differential shaft hole is smaller than the distance between the center of at least one of a motor shaft hole or a differential shaft hole and the center of the other motor shaft hole. Along the radial direction of the dual-motor powertrain, an oil collecting protrusion is arranged between a motor shaft hole and a differential shaft hole.

[0010] In the embodiment of the present application, the oil collecting protrusion is arranged between a motor shaft hole and a differential shaft hole, a motor shaft hole is used to align with the input wheel of the parallel shaft gear set, and the differential shaft hole is used to align with the differential, and the positional relationship between a motor shaft hole and the differential shaft hole represents the positional relationship between the input wheel and the differential. The distance between the center of a motor shaft hole and the center of a differential shaft hole is smaller than the distance between the center of at least one of a motor shaft hole or a differential shaft hole and the center of another motor shaft hole, which can shorten the distance that the lubricating oil flows between the input wheel and the oil collecting protrusion and between the oil collecting protrusion and the differential, which is conducive to improving the efficiency of oil collecting and oil guiding of the oil collecting protrusion.

[0011] In one embodiment, a distance between an oil collecting protrusion and a center of a differential shaft hole is smaller than a distance between an oil collecting protrusion and a center of a motor shaft hole.

[0012] In the embodiment of the present application, the oil collecting protrusion is closer to the differential shaft hole relative to the motor shaft hole, which is beneficial to shorten the movement path of the lubricating oil from the oil collecting protrusion to the differential, and can improve the accuracy of the lubricating oil flowing to the differential.

[0013] In one embodiment, a cavity wall of a motor cavity includes an oil return hole, and the oil return hole is used to connect a motor cavity and a reducer cavity. In the radial direction of the dual-motor powertrain, an oil return hole is arranged between a motor shaft hole and an oil collecting protrusion, and the distance between the center of an oil return hole and an oil collecting protrusion is smaller than the distance between the center of an oil return hole and the center of a motor shaft hole.

[0014] In an embodiment of the present application, a motor shaft hole, an oil collecting protrusion, and a differential shaft hole are arranged along the radial direction of the dual-motor powertrain, that is, there is a height difference between a motor and the oil collecting protrusion and the differential along the radial direction of the dual-motor powertrain. An oil return hole in the cavity wall of a motor cavity is located between a motor shaft hole and the oil collecting protrusion, so that there is also a height difference between the oil return hole and the oil collecting protrusion and the differential housing. The two openings of an oil return hole along the axial direction of the dual-motor powertrain are connected to the motor cavity and the reducer cavity respectively. Under the effect of the height difference, the lubricating oil in a motor cavity can flow to the oil collecting protrusion through an oil return hole, which is beneficial to increase the amount of lubricating oil collected by the oil collecting protrusion and improve the utilization rate of the lubricating oil.

[0015] In an embodiment of the present application, the distance between the center of a motor shaft hole and the oil collecting protrusion is greater than the distance between the oil collecting protrusion and the center of the differential shaft hole, providing sufficient space for opening an oil return hole between a motor shaft hole and the oil collecting protrusion, so that an oil return hole can be close to the bottom of a motor cavity, thereby facilitating the lubricating oil deposited at the bottom of a motor cavity due to gravity to flow to the oil collecting protrusion through an oil return hole.

[0016] In the embodiment of the present application, the oil throwing of an output wheel and an intermediate wheel and the oil return of an oil return hole all belong to the passive oil collection method of the oil collecting protrusion. The passive oil collection is greatly affected by the motor speed, that is, the lubricating oil needs to rely on the power brought by the high-speed rotation of the motor. When the motor speed is high, the oil collecting protrusion can provide more lubricating oil to the differential through passive oil collection, which is beneficial to the differential being fully lubricated under high-speed rotation.

[0017] In one embodiment, another intermediate wheel of a parallel shaft gear set is used to mesh with an output wheel, and a bearing groove along the axial direction of the dual-motor powertrain is used to align with an intermediate wheel and another intermediate wheel. Wherein, the distance between an oil collecting protrusion and the center of a bearing groove is less than the distance between an oil collecting protrusion and the center of any one of a motor shaft hole or a differential shaft hole.

[0018] In an embodiment of the present application, one intermediate wheel and another intermediate wheel are both sleeved on the intermediate shaft of the parallel shaft gear set, the intermediate wheel is spaced from the output wheel, and the intermediate wheel is meshed with the output wheel. Along the axial direction of the dual-motor powertrain, one intermediate wheel and the other intermediate wheel are aligned with the bearing groove. The oil collecting protrusion is closer to the bearing groove than one motor shaft hole and the differential shaft hole. When the oil collecting protrusion is located between the cavity wall of the reducer cavity and the output wheel, the oil collecting protrusion is close to the bearing groove, which is conducive to the oil collecting protrusion collecting part of the lubricating oil thrown out of the other intermediate wheel. When the oil collecting protrusion is located between the cavity wall of the reducer cavity and an intermediate wheel, the oil collecting protrusion is close to the bearing groove, which is conducive to the oil collecting protrusion collecting part of the lubricating oil thrown out of an intermediate wheel. By adjusting the distance between the oil collecting protrusion and the bearing groove, a motor shaft hole and the differential shaft hole, the embodiment of the present application can reduce the difficulty of oil collecting by the oil collecting protrusion in different scenarios.

[0019] In one embodiment, an oil collecting protrusion protrudes toward an intermediate wheel along the axial direction of the dual-motor powertrain, and a distance between an oil collecting protrusion and an intermediate wheel is smaller than a distance between a differential shaft hole and an intermediate wheel.

[0020] In an embodiment of the present application, the protruding direction of the oil collecting protrusion is related to the arrangement of the differential in the speed reducer. When the differential protrudes toward an intermediate wheel, the protruding direction of the oil collecting protrusion is also toward an intermediate wheel, so that the oil collecting protrusion can collect part of the lubricating oil thrown out by an intermediate wheel, thereby improving the oil collecting efficiency. The oil collecting protrusion is closer to an intermediate wheel relative to the differential shaft hole, which can shorten the movement path of the lubricating oil between an intermediate wheel and the oil collecting protrusion, and can also prevent the lubricating oil of the oil collecting protrusion from flowing directly to the differential shaft hole. If the lubricating oil flows directly to the differential shaft hole, the lubricating oil may accumulate in the differential shaft hole, causing oil stirring loss.

[0021] In one embodiment, an oil collecting protrusion protrudes toward an output wheel along the axial direction of the dual-motor powertrain, and a distance between an oil collecting protrusion and an output wheel is smaller than a distance between a differential shaft hole and an output wheel.

[0022] In the embodiment of the present application, when the differential is away from an intermediate wheel protrusion, the protrusion direction of the oil collecting protrusion is toward the output wheel, so that the oil collecting protrusion can collect part of the lubricating oil thrown out by the output wheel, thereby improving the oil collecting efficiency. The oil collecting protrusion is closer to the output wheel relative to the differential shaft hole, which can shorten the movement path of the lubricating oil between the output wheel and the oil collecting protrusion, and can also prevent the lubricating oil of the oil collecting protrusion from flowing directly to the differential shaft hole.

[0023] In one embodiment, an oil collecting protrusion includes two oil collecting sections, one end of one oil collecting section intersects with one end of the other oil collecting section, the other end of one oil collecting section is spaced from the other end of the other oil collecting section, and the opening of the angle between one oil collecting section and the other oil collecting section along the radial direction of the dual-motor powertrain is toward a motor shaft hole and away from a differential shaft hole.

[0024] In an embodiment of the present application, one oil collecting section and another oil collecting section are in a V shape. Among them, the opening of the angle between one oil collecting section and another oil collecting section is away from the differential shaft hole, which is equivalent to the end where one oil collecting section and another oil collecting section intersect facing the differential, which can play a role in gathering the lubricating oil and draining it to the differential. The opening of the angle between one oil collecting section and another oil collecting section faces a motor shaft hole, which is equivalent to the other end of the interval between one oil collecting section and another oil collecting section facing the input wheel and an oil return hole, which is beneficial to improving the efficiency of the oil collecting protrusion in collecting lubricating oil from the input wheel and an oil return hole. In an embodiment of the present application, both sides of one oil collecting section and another oil collecting section along the circumference of the dual-motor powertrain can be used to collect lubricating oil.

[0025] In one embodiment, the distance between the other end of one oil collecting section and the center of one bearing groove is smaller than the distance between the other end of another oil collecting section and the center of another motor shaft hole.

[0026] In an embodiment of the present application, the other end of one oil collecting section is spaced apart from the other end of another oil collecting section, and the distance between the other end of one oil collecting section and the bearing groove is smaller than the distance between the other end of another oil collecting section and the other motor shaft hole, that is, the oil collecting protrusion is closer to the bearing groove relative to the other motor shaft hole, so that the oil collecting protrusion can collect part of the lubricating oil thrown out by one intermediate wheel or another intermediate wheel.

[0027] In one embodiment, an oil collecting protrusion includes a through-hole, and a through-hole passes through one end of an oil collecting protrusion, and the distance between the center of a through-hole and the center of a differential shaft hole is smaller than the distance between the other end of an oil collecting protrusion and the center of a differential shaft hole.

[0028] In the embodiment of the present application, along the radial direction of the dual-motor powertrain, the through-hole runs through one end of the oil collecting protrusion, and the distance between the through-hole and the differential shaft hole is smaller than the distance between the other end of the oil collecting protrusion and the differential shaft hole, so that the lubricating oil collected by the oil collecting protrusion tends to move to the through-hole first, and then be guided to the differential, thereby improving the accuracy of the oil guide and achieving directional lubrication of the differential. If the oil collecting protrusion does not include a through-hole, the lubricating oil may flow out before flowing to one end of the oil collecting protrusion, and it cannot be ensured that the lubricating oil collected by the oil collecting protrusion can flow directly into the differential, which is not conducive to improving the lubrication effect of the differential.

[0029] In the embodiment of the present application, the two ends of the oil collecting protrusion cooperate with the through-flow hole to realize simultaneous oil collection and oil guiding, reduce the lubricating oil accumulated on the oil collecting protrusion, and enable the oil collecting protrusion to have enough space for collecting the lubricating oil. If the oil collecting protrusion does not include the through-flow hole, the lubricating oil may need to accumulate to a certain extent on the oil collecting protrusion before overflowing from the oil collecting protrusion, thereby reducing the efficiency of oil collection and oil guiding.

[0030] In one embodiment, a differential includes a planetary shaft and a differential gear set, wherein the planetary shaft is used for driving connection with the differential gear set, wherein a through-flow hole is at least partially aligned with a planetary shaft in the radial direction of the dual-motor powertrain, the inner diameter of the through-flow hole is less than or equal to the outer diameter of the planetary shaft, the through-flow hole is used for guiding lubricating oil to the planetary shaft, and the planetary shaft is used for throwing the lubricating oil to a differential gear set.

[0031] In the embodiment of the present application, a through-flow hole along the radial direction of the dual-motor powertrain is at least partially aligned with a planetary shaft, which means that the projection of the through-flow hole along the radial direction of the dual-motor powertrain overlaps with the projection of the planetary shaft at least partially, so that the oil collecting protrusion can guide the collected lubricating oil to the planetary shaft. The inner diameter of the through-flow hole is less than or equal to the outer diameter of the planetary shaft, which improves the accuracy of the through-flow hole in guiding the lubricating oil to the planetary shaft.

[0032] In the embodiment of the present application, the planetary shaft is drivingly connected to the differential gear set. When the planetary shaft rotates, the lubricating oil is thrown by the planetary shaft to the differential gear set, thereby lubricating the differential gear set. The embodiment of the present application uses the planetary shaft as an intermediate medium to lubricate the differential gear set. By diverting the lubricating oil to the planetary shaft, the coverage of the lubricating oil is expanded by the rotation of the planetary shaft, thereby realizing the redistribution of the lubricating oil in the differential housing. If the oil collecting protrusion directly guides the lubricating oil to a single gear in the differential gear, although the lubricating oil has a better lubricating effect on the single gear, the coverage of the lubricating oil is limited to the single gear and the gears adjacent to it, which may cause some gears of the differential to have a problem of insufficient local lubrication.

[0033] In one embodiment, the oil collecting protrusion is used to form an oil collecting groove with the cavity wall of the reducer cavity, and the notch of an oil collecting groove along the axial direction of the dual-motor powertrain faces an intermediate wheel or an output wheel. In the radial direction of the dual-motor powertrain, the distance between a through-flow hole and a differential housing is smaller than the distance between the groove bottom of an oil collecting groove and a differential housing of a differential. A differential housing is used to be fixed to an output wheel and to accommodate a planetary shaft and a differential gear set.

[0034] In the embodiment of the present application, the bottom of the oil collecting groove along the axial direction of the dual-motor powertrain is opposite to the notch, and the bottom of the oil collecting groove is part of the cavity wall of the reducer cavity. The through-flow hole is closer to the differential housing than the bottom of the oil collecting groove, so that the lubricating oil at the bottom of the oil collecting groove tends to flow to the through-flow hole, avoiding excessive lubricating oil from accumulating at the bottom of the oil collecting groove, and improving the utilization rate of the lubricating oil.

[0035] In one embodiment, the distance between a through hole and a differential housing along the radial direction of the dual-motor powertrain is equal to the distance between the bottom of an oil collecting tank and a differential housing. The embodiment of the present application can reduce the processing difficulty and cost of the oil collecting tank without increasing the flow resistance of the lubricating oil.

[0036] In one embodiment, a through-flow hole is adjacent to and communicated with a notch of an oil collecting tank along the axial direction of the dual-motor powertrain.

[0037] In an embodiment of the present application, the axial flow hole and the notch of the oil collecting tank along the dual-motor powertrain are both located at one end of the oil collecting protrusion facing the oil collecting protrusion of the parallel shaft gear set. The flow hole and the notch of the oil collecting tank are connected to accelerate the discharge of the lubricating oil.

[0038] In one embodiment, a through hole is spaced apart from a slot of an oil collecting tank along the axial direction of the dual-motor powertrain, and a distance between a slot of an oil collecting tank and a differential housing along the radial direction of the dual-motor powertrain is smaller than a distance between a through hole and a differential housing.

[0039] In the embodiment of the present application, although the axial through-hole along the dual-motor powertrain is spaced from the notch of the oil collecting tank, the through-hole is closer to the differential housing than the notch of the oil collecting tank, so that part of the lubricating oil flowing to the notch of the oil collecting tank can flow back to the through-hole, thereby lubricating the differential in a directional manner. In one embodiment, the through-hole is closer to the differential housing than the notch and the bottom of the oil collecting tank. The embodiment of the present application is conducive to reducing the degree of accumulation of lubricating oil in the oil collecting tank.

[0040] In one embodiment, the cavity wall of a reducer cavity further includes an oil spray hole, and the oil spray hole is used to fix a nozzle, and the nozzle is used to spray lubricating oil to an oil collecting protrusion. Wherein, an oil spray hole is arranged between an oil collecting protrusion and another motor shaft hole, and the distance between the center of an oil spray hole and an oil collecting protrusion is smaller than the distance between the center of an oil spray hole and the center of another motor shaft hole.

[0041] In the embodiment of the present application, the oil spray hole is used to spray lubricating oil to the oil collecting protrusion through the nozzle. The oil spray hole is closer to the oil collecting protrusion relative to the center of the motor shaft hole, which is conducive to reducing the difficulty of spraying the lubricating oil to the oil collecting protrusion. The oil collecting protrusion collects the lubricating oil sprayed by the nozzle, which is an active oil collection method. Compared with passive oil collection, active oil collection is less affected by the motor speed. Under both high-speed and low-speed conditions of the motor, the nozzle can actively spray oil to the oil collecting protrusion.

[0042] In a second aspect, an embodiment of the present application provides a vehicle, comprising a frame and a dual-motor powertrain as described in any embodiment of the first aspect, the frame being used to mount the dual-motor powertrain, a differential of the dual-motor powertrain being used to drive the wheels of the vehicle, and an oil collecting protrusion being higher than a differential along the direction of gravity.

[0043] In an embodiment of the present application, when the dual-motor powertrain is applied to a vehicle scenario, since the flow of the lubricating oil is affected by gravity, it is necessary to set the oil collecting protrusion higher than the differential in the direction of gravity so that the flow path of the lubricating oil between the oil collecting protrusion and the differential conforms to the direction of gravity, which is beneficial to reducing flow resistance.

[0044] In one embodiment, the minimum angle between an oil collecting protrusion and the ground is greater than or equal to 20 degrees and less than or equal to 35 degrees.

[0045] The embodiment of the present application sets the minimum angle between the oil collecting protrusion and the ground to 20 to 35 degrees, which can effectively reduce the risk of backflow of the lubricating oil of the oil collecting protrusion, avoid the negative impact of the lubricating effect of the differential on the special working conditions, and thus help improve the safety performance of the vehicle and ensure the smooth driving of the vehicle. If the minimum angle between the side of the oil collecting protrusion that plays the role of oil blocking and the ground is too small, when the vehicle goes uphill or downhill, the lubricating oil will fall on the side and it will be difficult to flow to the differential, and even the lubricating oil will flow back on the oil collecting protrusion, which will damage the lubricating effect on the differential. If the minimum angle between the side that plays the role of oil blocking and the ground is too large, although it will not affect the oil collecting and guiding effect of the oil collecting protrusion in the uphill and downhill working conditions of the vehicle, when the vehicle is driving on a horizontal ground, it will reduce the angle between the oil collecting section and the oil collecting section of the oil collecting protrusion, thereby reducing the space for oil collecting in the oil collecting tank, so that the amount of lubricating oil that can be collected by the oil collecting protrusion is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0047] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0048] Figure 2 is a schematic structural diagram of a dual-motor powertrain provided in an embodiment of the present application;

[0049] Figure 3 is a schematic structural diagram of a dual-motor powertrain provided in an embodiment of the present application;

[0050] Figure 4 is a structural schematic diagram of an assembly housing provided in an embodiment of the present application;

[0051] Figure 5 is a schematic diagram of a partial structure of an assembly housing provided in an embodiment of the present application;

[0052] Figure 6 yes Figure 4 A partial enlarged view of the M1 portion of the assembly housing is shown;

[0053] Figure 7 is a schematic diagram of a partial structure of an assembly housing provided in an embodiment of the present application;

[0054] Figure 8 is a schematic diagram of a partial structure of an assembly housing provided in an embodiment of the present application;

[0055] Fig. 9 is a partial exploded view of a dual-motor powertrain provided in an embodiment of the present application;

[0056] Fig.10 yes Fig. 9 A partial enlarged view of the M2 part of the dual-motor powertrain shown;

[0057] Fig.11 It is a partial structural schematic diagram of the dual-motor powertrain provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0059] The current differential has the problem of insufficient lubrication. The embodiment of the present application provides a dual-motor powertrain with an oil-collecting lubricating differential, and the dual-motor powertrain includes two motors and a reducer. The assembly housing of the dual-motor powertrain is used to form a reducer cavity and two motor cavities arranged in parallel, the two motor cavities are used to fix the stators of the two motors respectively, and a reducer cavity is used to accommodate a parallel shaft gear set and a differential of a reducer. Among them, the assembly housing includes a differential shaft hole and two motor shaft holes, one differential shaft hole is used to pass through a wheel drive shaft, one motor shaft hole is used to connect a motor cavity and a reducer cavity, and the other motor shaft hole is used to connect another motor cavity and a reducer cavity. The cavity wall of a reducer cavity includes a bearing groove and an oil collecting protrusion, a bearing groove is used to fix the bearing of an intermediate shaft of a parallel shaft gear set, and an oil collecting protrusion is used to collect lubricating oil and guide it to a differential. The distance between the center of a bearing groove and the center of another motor shaft hole is greater than the distance between the center of at least one of a motor shaft hole or a differential shaft hole and the center of another motor shaft hole. An oil collecting protrusion is arranged between an intermediate wheel or an output wheel of a parallel shaft gear set and a cavity wall of a reducer cavity.

[0060] In the scenario of a vertical reducer, the embodiment of the present application integrates the functions of oil collection and oil guidance into an oil collecting protrusion to achieve lubrication of the differential, which is beneficial to increasing the service life of the differential and the structural strength of the powertrain, thereby ensuring driving safety.

[0061] The powertrain provided in the embodiments of the present application can be applied to vehicles.

[0062] See also Figure 1 , Figure 1 A schematic diagram of the structure of the vehicle 1 provided in the embodiment of the present application. In the embodiment of the present application, the vehicle 1 refers to a wheeled device driven or towed by a power device. In the embodiment of the present application, the vehicle 1 includes a frame 20, a battery pack 30 and a dual-motor powertrain 10. Among them, the frame 20 is the structural skeleton of the vehicle 1, and the frame 20 is used to install the battery pack 30 and the dual-motor powertrain 10, and can bear the internal and external environmental loads of the vehicle 1. The battery pack 30 is used to supply power to the dual-motor powertrain 10, and the battery pack 30 can also be called a power battery. The dual-motor powertrain 10 is the power source of the vehicle 1, and the dual-motor powertrain 10 is used to drive the wheels 40 of the vehicle 1.

[0063] See also Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of a dual-motor powertrain 10 provided in an embodiment of the present application. Figure 3The schematic diagram of the structure of the dual-motor powertrain 10 provided in the embodiment of the present application. In the embodiment of the present application, the dual-motor powertrain 10 includes two motors 200 and a reducer 300, and a reducer 300 includes a parallel shaft gear set 310 and a differential 320. At least one of the two motors 200 transmits power to a differential 320 through a parallel shaft gear set 310. For example, Figure 2 and Figure 3 As shown, in one embodiment, a parallel shaft gear set 310 includes an input wheel 311, an intermediate wheel 312a, another intermediate wheel 312b and an output wheel 314. An input wheel 311 is drivingly connected to a motor 200 and meshes with an intermediate wheel 312a. An intermediate wheel 312a and another intermediate wheel 312b are both sleeved on an intermediate shaft 313, and another intermediate wheel 312b meshes with an output wheel 314. An output wheel 314 is drivingly connected to a differential 320. Figure 2 and Figure 3 As shown, in one embodiment, a differential 320 protrudes toward either an intermediate wheel 312 a or an output wheel 314 .

[0064] like Figure 2 and Figure 3 As shown, in one embodiment, the vehicle further includes two wheel drive shafts 50, each wheel drive shaft 50 is respectively connected to the differential 320 and the wheel, and the power generated by the dual-motor powertrain 10 can be sequentially transmitted to the wheel drive shafts 50 and the wheels to enable the vehicle to travel. When the vehicle is turning or driving on an uneven road, the differential 320 can enable the left and right wheel drive shafts 50 to rotate at different speeds, thereby enabling the left and right wheels to rotate at different speeds, which can ensure the wheels to roll.

[0065] In one embodiment, the dual-motor powertrain 10 is a pure electric powertrain, and both motors 200 are electric motors. The electric motors are used to convert electrical energy into mechanical energy, and transmit the mechanical energy to the differential 320 through the parallel shaft gear set 310 .

[0066] like Figure 2 and Figure 3As shown, in one embodiment, the dual-motor powertrain 10 is a hybrid power system, and the dual-motor powertrain 10 also includes an engine 400, one of the two motors 200 is an electric motor, and the other motor 200 is a generator. Among them, the engine 400 is used to convert other forms of energy into kinetic energy. For example, the engine 400 can be a fuel engine, which is used to convert chemical energy into kinetic energy. The engine 400 is connected to the generator in a transmission manner, and the engine 400 provides power to the generator, and the generator converts the kinetic energy output by the engine 400 into electrical energy. In one embodiment, the generator can charge the battery pack 30.

[0067] like Figure 2 and Figure 3 As shown, in one embodiment, the dual-motor powertrain 10 further includes a power supply device 500, which is electrically connected to the generator, the battery pack 30, and the motor, and is used to control the power mode of the powertrain. In one embodiment, the power supply device 500 includes at least one of a motor controller, an on-board charging device, a DC conversion device, a DC power supply device, and a vehicle controller.

[0068] In a dual-motor powertrain, the differential is the core component used to achieve different speeds for the left and right wheels. There are usually complex transmission components inside the differential. If there is severe wear between these contacting transmission components, the service life may be shortened, and in serious cases, it may even lead to safety accidents.

[0069] The embodiment of the present application can enhance the lubrication effect on the differential and improve the safety performance of the dual-motor powertrain and the vehicle by improving the layout of the oil collecting components in the dual-motor powertrain.

[0070] See also Figures 4 to 6 , Figure 4 This is a schematic diagram of the structure of the assembly housing 100 provided in an embodiment of the present application. Figure 5 This is a schematic diagram of a partial structure of an assembly housing 100 provided in an embodiment of the present application. Figure 6 for Figure 4 The partial enlarged view of the M1 part of the assembly housing 100 is shown. In order to clearly show the arrangement of the oil collecting protrusions 111 in the assembly housing 100, Figure 5 Only a partial structure of the assembly housing 100 is retained.

[0071] like Figure 4 and Figure 5 As shown, the assembly housing 100 of the dual-motor powertrain 10 is used to form a reducer cavity 110 and two motor cavities 120 arranged in parallel. The two motor cavities 120 are used to fix the stators of the two motors 200 respectively, and the reducer cavity 110 is used to accommodate a parallel shaft gear set and a differential of a reducer 300. Figure 4 and Figure 5 As shown, the assembly housing 100 includes a differential shaft hole 130 and two motor shaft holes 140. One differential shaft hole 130 is used to pass a wheel drive shaft, one motor shaft hole 140 is used to connect a motor cavity 120 and a reducer cavity 110, and the other motor shaft hole 140 is used to connect another motor cavity 120 and a reducer cavity 110.

[0072] like Figure 6 As shown, the cavity wall of a reducer cavity 110 includes a bearing groove 112 and an oil collecting protrusion 111. A bearing groove 112 is used to fix a bearing of an intermediate shaft of a parallel shaft gear set, and an oil collecting protrusion 111 is used to collect lubricating oil and guide it to a differential. Figure 5 As shown, the distance between the center of a bearing groove 112 and the center of another motor shaft hole 140 is greater than the distance between the center of at least one of a motor shaft hole 140 or a differential shaft hole 130 and the center of another motor shaft hole 140. An oil collecting protrusion 111 is arranged between an intermediate wheel 312a or an output wheel 314 of a parallel shaft gear set 310 and a cavity wall of a reducer cavity 110.

[0073] In the embodiments of the present application, for the convenience of description, Figure 2 and Figure 3 As shown, the two motors 200 are respectively referred to as a motor 200a and another motor 200b. Figure 4 As shown, the two motor cavities 120 of the assembly housing 100 are respectively referred to as one motor cavity 120a and the other motor cavity 120b, and the two motor shaft holes 140 of the assembly housing 100 are respectively referred to as one motor shaft hole 140a and the other motor shaft hole 140b, one motor shaft hole 140a is used to connect one motor cavity 120a with one reducer cavity 110, and the other motor shaft hole 140b is used to connect the other motor cavity 120b with one reducer cavity 110. Among them, one motor cavity 120a and another motor cavity 120b are arranged in parallel, which means that the two are arranged in parallel relative to one reducer cavity 110, that is, the arrangement direction of one motor cavity 120a and another motor cavity 120b intersects with the arrangement direction of one motor cavity 120a and one reducer cavity 110, and the arrangement direction of the other motor cavity 120b and one reducer cavity 110.

[0074] In the embodiment of the present application, the parallel shaft gear set 310 and the differential 320 are located in the reducer cavity 110, and the cavity wall of the reducer cavity 110 includes an oil collecting protrusion 111. The differential 320 receives the lubricating oil collected by the oil collecting protrusion 111 to avoid serious wear of the differential 320. One of the sources of the lubricating oil collected by the oil collecting protrusion 111 is the oil thrown from an intermediate wheel 312a or an output wheel 314 of the parallel shaft gear set 310. In one embodiment, an intermediate wheel 312a and an output wheel 314 are arranged at intervals along the axial direction O of the dual-motor powertrain 10, and an output wheel 314 is drivingly connected to the differential 320, and the differential 320 protrudes toward or away from an intermediate wheel 312a.

[0075] In the implementation of this application, the position of the oil collecting protrusion 111 needs to cooperate with the parallel shaft gear set 310, and the gear arrangement of the parallel shaft gear set 310 is affected by the layout of other internal components in the dual-motor powertrain. Therefore, it is necessary to adjust the position of the oil collecting protrusion 111 according to the layout of the internal components of the dual-motor powertrain, otherwise it may have a negative impact on the oil collecting and oil guiding functions of the oil collecting protrusion 111, reducing the lubrication efficiency of the differential 320.

[0076] The positional relationship between the motor cavity 120a, the motor cavity 120b and the reducer cavity 110 represents the positional relationship between the motor 200a, the motor 200b and the reducer 300 in the dual-motor powertrain, that is, the motor 200a and the motor 200b are arranged in parallel on one side of the reducer 300. The positional relationship between the motor shaft hole 140a, the motor shaft hole 140b, the differential shaft hole 130 and the bearing slot 112 represents the layout characteristics of the reducer 300 in the dual-motor powertrain 10. Specifically, as Figure 5 As shown, the distance between the center of the bearing groove 112 and the center of the motor shaft hole 140b is recorded as L1, the distance between the center of the motor shaft hole 140a and the center of the motor shaft hole 140b is recorded as L2, and the distance between the center of the differential shaft hole 130 and the center of the motor shaft hole 140b is recorded as L3. L1 is greater than at least one of L2 or L3, indicating that the parallel shaft gear set 310 and the motor 200a have a transmission connection relationship. In order to avoid interference between the parallel shaft gear set 310 and the differential 320 of the reducer 300 and the motor 200b, the motor 200b and the reducer 300 need to be staggered, so that the reducer 300 presents a vertical reducer structure in the dual-motor powertrain 10. Among them, the vertical reducer is opposite to the horizontal reducer. The main difference between the two is not the arrangement characteristics inside the reducer, but the arrangement characteristics of the reducer as a whole inside the powertrain.

[0077] Based on the layout of the internal components of the dual-motor powertrain 10 and the structure of the vertical reducer, the oil collecting protrusion 111 in the embodiment of the present application is located between an intermediate wheel 312a or an output wheel 314 of a parallel shaft gear set 310 and the cavity wall of the reducer cavity 110, which is equivalent to the oil collecting protrusion 111 being arranged in the overlapping area of ​​the projection of an intermediate wheel 312a and an output wheel 314 along the axial direction O of the dual-motor powertrain 10, so that no matter whether the differential 320 protrudes toward or away from an intermediate wheel 312a, the oil collecting protrusion 111 can collect part of the lubricating oil swung by the parallel shaft gear set 310 and guide the lubricating oil to the differential 320. If the layout of the oil collecting protrusion in the embodiment of the present application is applied to a horizontal reducer, that is, the oil collecting protrusion is arranged in the overlapping area of ​​the axial projection of an intermediate wheel and an output wheel of the horizontal reducer, it will increase the difficulty of the oil collecting protrusion to collect and guide the oil, which is not conducive to achieving lubrication of the differential.

[0078] In one embodiment, one oil collecting protrusion 111 is higher than one differential 320 along the gravity direction.

[0079] In the embodiment of the present application, when the dual-motor powertrain 10 is applied to the vehicle 1 scenario, since the flow of the lubricating oil is affected by gravity, it is necessary to set the oil collecting protrusion 111 higher than the differential 320 along the direction of gravity, so that the flow path of the lubricating oil between the oil collecting protrusion 111 and the differential 320 conforms to the direction of gravity, which is beneficial to reduce flow resistance.

[0080] See also Figure 7 , Figure 7 This is a schematic diagram of a partial structure of an assembly housing 100 provided in an embodiment of the present application. Figure 7 Part of the structure of the assembly housing 100 is omitted. In one embodiment, a motor shaft hole 140a along the axial direction O of the dual-motor powertrain 10 is used to align with an input wheel of a parallel shaft gear set, and a differential shaft hole 130 along the axial direction O of the dual-motor powertrain 10 is used to align with a differential. The distance between the center of a motor shaft hole 140a and the center of a differential shaft hole 130 is smaller than the distance between the center of at least one of a motor shaft hole 140a or a differential shaft hole 130 and the center of another motor shaft hole 140b, and an oil collecting protrusion 111 is arranged between a motor shaft hole 140a and a differential shaft hole 130 along the radial direction R of the dual-motor powertrain 10.

[0081] In the embodiment of the present application, the oil collecting protrusion 111 is arranged between the motor shaft hole 140a and the differential shaft hole 130. The motor shaft hole 140a is used to align with the input wheel 311 of the parallel shaft gear set 310. The differential shaft hole 130 is used to align with the differential 320. The positional relationship between the motor shaft hole 140a and the differential shaft hole 130 represents the positional relationship between the input wheel 311 and the differential 320.

[0082] In the embodiments of the present application, Figure 7 As shown, the distance between the center of the motor shaft hole 140a and the center of the differential shaft hole 130 is recorded as L4, and L4 is smaller than at least one of L2 or L3, which can shorten the distance that the lubricating oil flows between the input wheel 311 and the oil collecting protrusion 111 and between the oil collecting protrusion 111 and the differential 320, and is beneficial to improving the efficiency of oil collecting and guiding the oil collecting protrusion 111.

[0083] See also Figure 8 , Figure 8 This is a schematic diagram of a partial structure of an assembly housing 100 provided in an embodiment of the present application. Figure 8 Part of the structure of the assembly housing 100 is omitted. In one embodiment, the distance between one oil collecting protrusion 111 and the center of one differential shaft hole 130 is smaller than the distance between one oil collecting protrusion 111 and the center of one motor shaft hole 140a.

[0084] In the embodiments of the present application, Figure 8 As shown, the distance between an oil collecting protrusion 111 and the center of a differential shaft hole 130 is recorded as L5, and the distance between an oil collecting protrusion 111 and the center of a motor shaft hole 140a is recorded as L6. L5 is smaller than L6, and the oil collecting protrusion 111 is closer to the differential shaft hole 130 relative to the motor shaft hole 140a, which is beneficial to shorten the moving path of the lubricating oil from the oil collecting protrusion 111 to the differential 320, and can improve the accuracy of the lubricating oil flowing to the differential 320.

[0085] Please continue reading Figure 6 In one embodiment, the cavity wall of a motor cavity 120a includes an oil return hole 121, and the oil return hole 121 is used to connect a motor cavity 120a and a reducer cavity 110. In the radial direction R of the dual-motor power assembly 10, an oil return hole 121 is arranged between a motor shaft hole 140a and an oil collecting protrusion 111, and the distance between the center of an oil return hole 121 and an oil collecting protrusion 111 is smaller than the distance between the center of an oil return hole 121 and the center of a motor shaft hole 140a.

[0086] In the embodiment of the present application, the motor shaft hole 140a, the oil collecting protrusion 111 and the differential shaft hole 130 are arranged along the radial direction R of the dual-motor power assembly 10, that is, there is a height difference between the motor 200a and the oil collecting protrusion 111 and the differential 320 along the radial direction R of the dual-motor power assembly 10. An oil return hole 121 of the cavity wall of the motor cavity 120a is located between the motor shaft hole 140a and the oil collecting protrusion 111, so that there is also a height difference between the oil return hole 121 and the oil collecting protrusion 111 and the differential housing 323. For ease of expression, the oil return hole 121 is recorded as oil return hole 121a. The two openings of the oil return hole 121a along the axial direction O of the dual-motor powertrain 10 are respectively connected to the motor cavity 120a and the reducer cavity 110. Under the action of the height difference, the lubricating oil in the motor cavity 120a can flow to the oil collecting protrusion 111 through the oil return hole 121a, which is beneficial to increase the amount of lubricating oil collected by the oil collecting protrusion 111 and improve the utilization rate of the lubricating oil.

[0087] In the embodiments of the present application, Figure 8 As shown, the distance L6 between the center of the motor shaft hole 140a and the oil collecting protrusion 111 is greater than the distance L5 between the oil collecting protrusion 111 and the center of the differential shaft hole 130, providing sufficient space for opening the oil return hole 121a between the motor shaft hole 140a and the oil collecting protrusion 111, so that the oil return hole 121a can be close to the bottom of the motor cavity 120a, so that the lubricating oil deposited at the bottom of the motor cavity 120a due to gravity can flow to the oil collecting protrusion 111 through the oil return hole 121a.

[0088] In the embodiment of the present application, the oil throwing of an output wheel 314 and an intermediate wheel 312a and the oil return of the oil return hole 121a all belong to the passive oil collection method of the oil collecting protrusion 111. The passive oil collection is greatly affected by the motor speed, that is, the lubricating oil needs to rely on the power brought by the high-speed rotation of the motor. When the motor speed is high, the oil collecting protrusion 111 can provide more lubricating oil to the differential 320 through passive oil collection, which is beneficial for the differential 320 to be fully lubricated under high-speed rotation.

[0089] Please continue reading Figure 6 In one embodiment, the cavity wall of one motor cavity 120a further includes another oil return hole 121, and the other oil return hole 121 is used to connect one motor cavity 120a and one reducer cavity 110. Among them, along the circumferential direction C of the dual-motor power assembly 10, the other oil return hole 121 is arranged alternately with an oil collecting protrusion 111, and along the circumferential direction C of the dual-motor power assembly 10, the inner diameter of one oil return hole 121 is smaller than the inner diameter of the other oil return hole 121.

[0090] In the embodiment of the present application, for the convenience of expression, the other oil return hole 121 is recorded as another oil return hole 121b. The oil return hole 121a and the oil return hole 121b cooperate to achieve the reasonable distribution of the lubricating oil in the reducer 300. Specifically, the oil return hole 121b and the oil collecting protrusion 111 are arranged at intervals along the circumferential direction C of the dual-motor powertrain 10, so the lubricating oil flowing through the oil return hole 121b is difficult to flow directly to the oil collecting protrusion 111. The inner diameter of the oil return hole 121b is larger than the inner diameter of the oil return hole 121a, so that the oil return efficiency of the oil return hole 121b is higher than the oil return efficiency of the oil return hole 121a. Among the lubricating oil flowing from the motor cavity 120a into the reducer cavity 110, a small portion of the lubricating oil flows to the differential 320 through the oil return hole 121a and the oil collecting protrusion 111, and most of the lubricating oil flows to the bottom of the reducer cavity 110 through the oil return hole 121b to provide oil reserve for the parallel shaft gear set 310. When the reducer 300 is working, the parallel shaft gear set 310 swings the lubricating oil at the bottom of the reducer cavity 110, which is beneficial to reducing the wear of the parallel shaft gear set 310, and part of the swinging lubricating oil can also be collected by the oil collecting protrusion 111.

[0091] Please continue reading Figure 8 In one embodiment, one bearing groove 112 along the axial direction O of the dual-motor powertrain 10 is used to align with one intermediate wheel and another intermediate wheel. Figure 8 As shown, the distance between an oil collecting protrusion 111 and the center of a bearing groove 112 is smaller than the distance between an oil collecting protrusion 111 and the center of any one of a motor shaft hole 140 a and a differential shaft hole 130 .

[0092] In the embodiments of the present application, Figure 2 and Figure 3 As shown, the intermediate wheel 312a and the intermediate wheel 312b are both sleeved on the intermediate shaft 313 of the parallel shaft gear set 310, the intermediate wheel 312a is spaced from the output wheel 314, and the intermediate wheel 312b is meshed with the output wheel 314. Among them, the intermediate wheel 312a can also be called an intermediate driven gear, and the intermediate wheel 312b can also be called an intermediate driving gear.

[0093] In the embodiment of the present application, the intermediate wheels 312a and 312b are aligned with the bearing groove 112 along the axial direction O of the dual-motor powertrain 10. Figure 8As shown, the distance between the oil collecting protrusion 111 and the center of the bearing groove 112 is recorded as L7, L7 is less than L5 and L7 is less than L6, indicating that the oil collecting protrusion 111 is closer to the bearing groove 112 relative to the motor shaft hole 140a and the differential shaft hole 130. When the oil collecting protrusion 111 is located between the cavity wall of the reducer cavity 110 and the output wheel 314, the oil collecting protrusion 111 close to the bearing groove 112 is conducive to the oil collecting protrusion 111 collecting part of the lubricating oil thrown out of the intermediate wheel 312b. When the oil collecting protrusion 111 is located between the cavity wall of the reducer cavity 110 and the intermediate wheel 312a, the oil collecting protrusion 111 close to the bearing groove 112 is conducive to the oil collecting protrusion 111 collecting part of the lubricating oil thrown out of the intermediate wheel 312a. The embodiment of the present application can reduce the difficulty of oil collecting protrusion 111 in different scenarios by adjusting the distance between the oil collecting protrusion 111 and the bearing groove 112, the motor shaft hole 140a and the differential shaft hole 130.

[0094] In one embodiment, an oil collecting protrusion 111 protrudes toward an intermediate wheel 312a along the axial direction O of the dual-motor powertrain 10. The distance between an oil collecting protrusion 111 and an intermediate wheel 312a is less than the distance between a differential shaft hole 130 and an intermediate wheel 312a.

[0095] In the embodiment of the present application, the protruding direction of the oil collecting protrusion 111 is related to the arrangement of the differential 320 in the reducer 300. When the differential 320 protrudes toward the intermediate wheel 312a, the protruding direction of the oil collecting protrusion 111 is also toward the intermediate wheel 312a, so that the oil collecting protrusion 111 can collect part of the lubricating oil thrown out by the intermediate wheel 312a, thereby improving the oil collecting efficiency. The oil collecting protrusion 111 is closer to the intermediate wheel 312a relative to the differential shaft hole 130, which can shorten the moving path of the lubricating oil between the intermediate wheel 312a and the oil collecting protrusion 111, and can also prevent the lubricating oil of the oil collecting protrusion 111 from flowing directly to the differential shaft hole 130. If the lubricating oil flows directly to the differential shaft hole 130, the lubricating oil may accumulate in the differential shaft hole 130, causing oil stirring loss.

[0096] In one embodiment, an oil collecting protrusion 111 protrudes toward an output wheel 314 along the axial direction O of the dual-motor powertrain 10. The distance between an oil collecting protrusion 111 and an output wheel 314 is less than the distance between a differential shaft hole 130 and an output wheel 314.

[0097] In the embodiment of the present application, when the differential 320 is protruded away from the intermediate wheel 312a, the protruding direction of the oil collecting protrusion 111 is toward the output wheel 314, so that the oil collecting protrusion 111 can collect part of the lubricating oil thrown out by the output wheel 314, thereby improving the oil collecting efficiency. The oil collecting protrusion 111 is closer to the output wheel 314 relative to the differential shaft hole 130, which can shorten the moving path of the lubricating oil between the output wheel 314 and the oil collecting protrusion 111, and can also prevent the lubricating oil of the oil collecting protrusion 111 from flowing directly to the differential shaft hole 130.

[0098] Please continue reading Figure 6 In one embodiment, an oil collecting protrusion 111 includes two oil collecting sections 1111, one end of one oil collecting section 1111 intersects with one end of the other oil collecting section 1111, the other end of one oil collecting section 1111 is spaced from the other end of the other oil collecting section 1111, and the opening of the angle between one oil collecting section 1111 and the other oil collecting section 1111 along the radial direction R of the dual-motor powertrain 10 is toward a motor shaft hole 140a and away from a differential shaft hole 130.

[0099] In the embodiment of the present application, for the convenience of description, the two oil collecting sections 1111 are respectively referred to as one oil collecting section 1111a and the other oil collecting section 1111b. The oil collecting section 1111a and the oil collecting section 1111b are V-shaped. Among them, the opening of the angle between the oil collecting section 1111a and the oil collecting section 1111b is away from the differential shaft hole 130, which is equivalent to the end where the oil collecting section 1111a and the oil collecting section 1111b intersect toward the differential 320, which can play a role in gathering and draining the lubricating oil to the differential 320. The opening of the angle between the oil collecting section 1111a and the oil collecting section 1111b is toward the motor shaft hole 140a, which is equivalent to the other end of the interval between the oil collecting section 1111a and the oil collecting section 1111b facing the input wheel 311 and the oil return hole 121a, which is conducive to improving the efficiency of the oil collecting protrusion 111 in collecting lubricating oil from the input wheel 311 and the oil return hole 121a.

[0100] In the embodiment of the present application, both sides of the oil collecting section 1111a and the oil collecting section 1111b along the circumferential direction C of the dual-motor powertrain 10 can be used to collect lubricating oil. When the vehicle 1 is in different working conditions, the movement path of the lubricating oil between the parallel shaft gear set 310 and the oil collecting protrusion 111 will change, and the two sides of the oil collecting section 1111a and the two sides of the oil collecting section 1111b can play a complementary role in collecting oil.

[0101] Assuming that the positive rotation direction of the output wheel 314 is clockwise, the two side surfaces of the oil collecting section 1111a along the circumferential direction C of the dual-motor powertrain 10 are respectively recorded as the first side surface and the second side surface, and the two side surfaces of the oil collecting section 1111b along the circumferential direction C of the dual-motor powertrain 10 are respectively recorded as the third side surface and the fourth side surface. Among them, the second side surface and the third side surface along the circumferential direction C of the dual-motor powertrain 10 are located between the first side surface and the second side surface. In one embodiment, when the vehicle is driving forward on a horizontal road, the output wheel 314 rotates in a clockwise direction, so that the lubricating oil thrown by the output wheel 314 also has a tendency to move to the first side surface and the third side surface in a clockwise direction. In one embodiment, when the vehicle is reversing on a horizontal road, the output wheel 314 needs to be reversed, and the lubricating oil thrown by the output wheel 314 tends to move to the second side surface and the fourth side surface in a counterclockwise direction. In one embodiment, when the vehicle goes uphill, the oil collecting section 1111a and the oil collecting section 1111b rotate counterclockwise relative to the horizontal ground, so that the second side and the fourth side can receive the falling lubricating oil. In one embodiment, when the vehicle goes downhill, the oil collecting section 1111a and the oil collecting section 1111b rotate clockwise relative to the horizontal ground, so that the first side and the third side can receive the falling lubricating oil.

[0102] Please continue reading Figure 4 In one embodiment, the distance between the other end of one oil collecting section 1111a and the center of one bearing groove 112 is smaller than the distance between the other end of another oil collecting section 1111b and the center of another motor shaft hole 140b.

[0103] In the embodiment of the present application, the other end of the oil collecting section 1111a is spaced apart from the other end of the oil collecting section 1111b, and the distance between the other end of the oil collecting section 1111a and the bearing groove 112 is smaller than the distance between the other end of the oil collecting section 1111b and the other motor shaft hole 140b, that is, the oil collecting protrusion 111 is closer to the bearing groove 112 relative to the motor shaft hole 140b, so that the oil collecting protrusion 111 can collect part of the lubricating oil thrown out by the intermediate wheel 312a or the intermediate wheel 312b.

[0104] In one embodiment, the minimum angle between an oil collecting protrusion 111 and the ground is greater than or equal to 20 degrees and less than or equal to 35 degrees.

[0105] In the embodiment of the present application, if the minimum angle between the side of the oil collecting protrusion 111 that plays the role of oil blocking and the ground is too small, when the vehicle 1 goes uphill or downhill, the lubricating oil will fall on the side and it will be difficult to flow to the differential 320, and even the lubricating oil will flow back on the oil collecting protrusion 111, which will damage the lubrication effect of the differential 320. If the minimum angle between the side that plays the role of oil blocking and the ground is too large, although it will not affect the oil collecting and oil guiding effect of the oil collecting protrusion 111 in the uphill and downhill conditions of the vehicle 1, when the vehicle 1 is driving on the horizontal ground, the angle between the oil collecting section 1111a and the oil collecting section 1111b of the oil collecting protrusion 111 will be reduced, thereby reducing the space for oil collecting in the oil collecting groove 1113, so that the amount of lubricating oil that can be collected by the oil collecting protrusion 111 is reduced. Exemplarily, the minimum angle between an oil collecting protrusion 111 and the ground can be any one of 20 degrees, 22 degrees, 25 degrees, 27 degrees, 30 degrees, 32 degrees or 35 degrees.

[0106] Please continue reading Figure 4 and Figure 6 In one embodiment, an oil collecting protrusion 111 includes a through hole 1112, and a through hole 1112 passes through one end of an oil collecting protrusion 111, and the distance between the center of a through hole 1112 and the center of a differential shaft hole 130 is smaller than the distance between the other end of an oil collecting protrusion 111 and the center of a differential shaft hole 130.

[0107] In the embodiment of the present application, along the radial direction R of the dual-motor powertrain 10, the through-hole 1112 penetrates one end of the oil collecting protrusion 111, and the distance between the through-hole 1112 and the differential shaft hole 130 is smaller than the distance between the other end of the oil collecting protrusion 111 and the differential shaft hole 130, so that the lubricating oil collected by the oil collecting protrusion 111 tends to move to the through-hole 1112 first, and then be guided to the differential 320, thereby improving the accuracy of oil guidance and achieving directional lubrication of the differential 320. If the oil collecting protrusion 111 does not include the through-hole 1112, the lubricating oil may flow out before flowing to one end of the oil collecting protrusion 111, and it cannot be ensured that the lubricating oil collected by the oil collecting protrusion 111 can flow directly into the differential 320, which is not conducive to improving the lubrication effect of the differential 320.

[0108] In the embodiment of the present application, the two ends of the oil collecting protrusion 111 cooperate with the through-hole 1112 to realize simultaneous oil collection and oil guiding, reduce the lubricating oil accumulated on the oil collecting protrusion 111, and enable the oil collecting protrusion 111 to have enough space for collecting the lubricating oil. If the oil collecting protrusion 111 does not include the through-hole 1112, the lubricating oil may need to accumulate to a certain extent on the oil collecting protrusion 111 before overflowing from the oil collecting protrusion 111, thereby reducing the efficiency of oil collection and oil guiding.

[0109] See also Fig. 9 and Fig.10 , Fig. 9 This is a partial exploded view of the dual-motor powertrain 10 provided in an embodiment of the present application. Fig.10 for Fig. 9 A partial enlarged view of the M2 portion of the dual-motor powertrain 10 shown. In one embodiment, a differential 320 includes a planetary shaft 321 and a differential gear set 322, and a planetary shaft 321 is used for driving connection with a differential gear set 322. In which, along the radial direction R of the dual-motor powertrain 10, a through hole 1112 is at least partially aligned with a planetary shaft 321, the inner diameter of a through hole 1112 is less than or equal to the outer diameter of a planetary shaft 321, and a through hole 1112 is used to guide lubricating oil to a planetary shaft 321, and a planetary shaft 321 is used to throw the lubricating oil to a differential gear set 322.

[0110] In the embodiment of the present application, the planetary shaft 321 of the differential 320 is used for driving connection with the differential gear set 322. Exemplarily, in one embodiment, the differential gear set 322 includes planetary gears and side gears, the planetary gears are used to be sleeved on the planetary shaft 321 and meshed with the side gears, the side gears are used to be sleeved on the wheel drive shaft 50, and the planetary gears and the side gears surround the circumference of the planetary shaft 321. The output wheel 314 transmits power to the planetary shaft 321 and the planetary gears, and the rotation of the planetary gears drives the side gears to rotate, thereby driving the wheels 40 to rotate through the wheel drive shaft 50.

[0111] In the embodiment of the present application, one through-hole 1112 is at least partially aligned with one planetary shaft 321 along the radial direction R of the dual-motor powertrain 10, which means that the projection of the through-hole 1112 along the radial direction R of the dual-motor powertrain 10 at least partially overlaps with the projection of the planetary shaft 321, so that the oil collecting protrusion 111 can guide the collected lubricating oil to the planetary shaft 321. The inner diameter of the through-hole 1112 is less than or equal to the outer diameter of the planetary shaft 321, which improves the accuracy of the through-hole 1112 in guiding the lubricating oil to the planetary shaft 321. In one embodiment, a differential housing 323 includes a window 3231, a window 3231 penetrates a differential housing 323, a planetary shaft 321 is exposed to the window 3231, an oil collecting protrusion 111 is at least partially aligned with a window 3231 along the radial direction R of the dual-motor powertrain 10, and an oil collecting protrusion 111 is used to guide lubricating oil through a window 3231 to a planetary shaft 321.

[0112] In the embodiment of the present application, the planetary shaft 321 is connected to the differential gear set 322 in a transmission manner. When the planetary shaft 321 rotates, the lubricating oil is thrown from the planetary shaft 321 to the differential gear set 322, thereby lubricating the differential gear set 322. In the embodiment of the present application, the planetary shaft 321 is used as an intermediate medium for lubricating the differential gear set 322. By diverting the lubricating oil to the planetary shaft 321, the coverage of the lubricating oil is expanded by the rotation of the planetary shaft 321, thereby realizing the redistribution of the lubricating oil in the differential housing 323. If the oil collecting protrusion 111 directly guides the lubricating oil to a single gear in the gears of the differential 320, although the lubricating oil has a good lubricating effect on the single gear, the coverage of the lubricating oil is limited to the single gear and the gears adjacent to it, which may cause some gears of the differential 320 to have a problem of insufficient local lubrication.

[0113] Please continue reading Figure 6 and Fig.10 In one embodiment, the oil collecting protrusion 111 is used to form an oil collecting groove 1113 with the cavity wall of the reducer cavity 110, and the notch of the oil collecting groove 1113 is oriented toward an intermediate wheel or an output wheel along the axial direction O of the dual-motor powertrain 10. Along the radial direction R of the dual-motor powertrain 10, the distance between a through-flow hole 1112 and a differential housing 323 is smaller than the distance between the groove bottom of an oil collecting groove 1113 and a differential housing 323 of a differential 320. A differential housing 323 is used to be fixed to an output wheel 314 and to accommodate a planetary shaft 321 and a differential gear set 322.

[0114] In the embodiment of the present application, the bottom of the oil collecting groove 1113 is opposite to the notch along the axial direction O of the dual-motor powertrain 10, and the bottom of the oil collecting groove 1113 is part of the cavity wall of the reducer cavity 110. The through-hole 1112 is closer to the differential housing 323 than the bottom of the oil collecting groove 1113, so that the lubricating oil at the bottom of the oil collecting groove 1113 tends to flow to the through-hole 1112, avoiding excessive lubricating oil from accumulating at the bottom of the oil collecting groove 1113, and improving the utilization rate of the lubricating oil.

[0115] In one embodiment, the distance between a through hole 1112 and a differential housing 323 along the radial direction R of the dual-motor powertrain 10 is equal to the distance between the bottom of an oil collecting groove 1113 and a differential housing 323. The embodiment of the present application can reduce the processing difficulty and cost of the oil collecting groove 1113 without increasing the flow resistance of the lubricating oil.

[0116] Please continue reading Figure 6 and Fig.10 In one embodiment, along the axial direction O of the dual-motor powertrain 10 , a through hole 1112 is adjacent to and connected to a notch of an oil collecting groove 1113 .

[0117] In the embodiment of the present application, the flow hole 1112 and the notch of the oil collecting groove 1113 along the axial direction O of the dual-motor powertrain 10 are both located at one end of the oil collecting protrusion 111 facing the oil collecting protrusion 111 of the parallel shaft gear set 310. The flow hole 1112 and the notch of the oil collecting groove 1113 are connected to accelerate the discharge of the lubricating oil.

[0118] In one embodiment, along the axial direction O of the dual-motor powertrain 10 , a distance between a through hole 1112 and a slot of an oil collecting groove 1113 is smaller than a distance between a through hole 1112 and a differential housing 323 along the radial direction R of the dual-motor powertrain 10 .

[0119] In the embodiment of the present application, although the through-hole 1112 is spaced from the notch of the oil collecting groove 1113 along the axial direction O of the dual-motor powertrain 10, the through-hole 1112 is closer to the differential housing 323 than the notch of the oil collecting groove 1113, so that part of the lubricating oil flowing to the notch of the oil collecting groove 1113 can flow back to the through-hole 1112, thereby lubricating the differential 320 in a directional manner. In one embodiment, the through-hole 1112 is closer to the differential housing 323 than the notch and the bottom of the oil collecting groove 1113. The embodiment of the present application is conducive to reducing the degree of accumulation of lubricating oil in the oil collecting groove 1113.

[0120] Please refer to Figure 4 and Fig.11 , Fig.11 This is a partial structural diagram of the dual-motor powertrain 10 provided in the embodiment of the present application. To clearly show the positional relationship between the oil collecting protrusion 111 and the nozzle 600, Fig.11 The structures other than the oil collecting protrusion 111 and the nozzle 600 in the dual-motor powertrain are omitted.

[0121] In one embodiment, if Figure 4 As shown, the cavity wall of a reducer cavity 110 also includes an oil injection hole 113. Figure 4 and Fig.11 As shown, one oil spray hole 113 is used to fix one nozzle 600, and one nozzle 600 is used to spray lubricating oil to one oil collecting protrusion 111. Among them, one oil spray hole 113 is arranged between one oil collecting protrusion 111 and another motor shaft hole 140, and the distance between the center of one oil spray hole 113 and one oil collecting protrusion 111 is smaller than the distance between the center of one oil spray hole 113 and the center of another motor shaft hole 140.

[0122] In an embodiment of the present application, the oil spray hole 113 is used to spray lubricating oil onto the oil collecting protrusion 111 through the nozzle 600. The oil spray hole 113 is closer to the oil collecting protrusion 111 relative to the center of the motor shaft hole 140, which helps to reduce the difficulty of spraying the lubricating oil onto the oil collecting protrusion 111. The oil collecting protrusion 111 collects the lubricating oil sprayed by the nozzle 600, which belongs to an active oil collection method. Compared with passive oil collection, active oil collection is less affected by the rotation speed of the motor 200. Under both high-speed and low-speed conditions of the motor 200, the nozzle 600 can actively spray oil onto the oil collecting protrusion 111. Exemplarily, in one embodiment, the dual-motor powertrain 10 also includes an oil pump, which is used to communicate with the oil spray hole 113, and the power for the nozzle 600 to spray the lubricating oil comes from the oil pump.

[0123] Please continue reading Fig.11 In one embodiment, along the axial direction O of the dual-motor powertrain 10 , the distance between a nozzle 600 and the bottom of an oil collecting groove 1113 is smaller than the distance between a through hole 1112 and the bottom of an oil collecting groove 1113 .

[0124] In the embodiment of the present application, the nozzle 600 is closer to the bottom of the oil collecting groove 1113 relative to the flow hole 1112, that is, the nozzle 600 extends into the oil collecting groove 1113, which can improve the accuracy of the nozzle 600 in spraying lubricating oil onto the oil collecting protrusion 111 and improve the efficiency of the active oil collection of the oil collecting protrusion 111.

[0125] In one embodiment, the oil collecting protrusion 111 is integrally die-casted on the assembly housing 100 .

[0126] In one embodiment, the oil collecting protrusion 111 and the assembly housing 100 are separate structures, and the oil collecting protrusion 111 is fixedly connected to the assembly housing 100 by welding, gluing, etc.

[0127] The above is a detailed introduction to the dual-motor powertrain and vehicle of the oil-collecting lubricated differential provided in the embodiment of the present application. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those of ordinary skill in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A dual-motor powertrain with an oil-collecting lubricated differential, characterized in that: The dual-motor powertrain includes two motors and a reducer. The assembly housing of the dual-motor powertrain is used to form a reducer cavity and two motor cavities arranged in parallel. The two motor cavities are used to fix the stators of the two motors respectively. The one reducer cavity is used to accommodate a parallel shaft gear set and a differential of the one reducer, wherein: The assembly housing includes a differential shaft hole and two motor shaft holes, wherein the differential shaft hole is used to pass a wheel drive shaft, one motor shaft hole is used to connect one motor cavity and the one reducer cavity, and the other motor shaft hole is used to connect another motor cavity and the one reducer cavity; The cavity wall of the reducer cavity includes a bearing groove and an oil collecting protrusion, the bearing groove is used to fix the bearing of an intermediate shaft of the parallel shaft gear set, the oil collecting protrusion is used to collect lubricating oil and guide it to the differential, the distance between the center of the bearing groove and the center of the other motor shaft hole is greater than the distance between the center of at least one of the motor shaft hole or the differential shaft hole and the center of the other motor shaft hole, and the oil collecting protrusion is arranged between an intermediate wheel or an output wheel of the parallel shaft gear set and the cavity wall of the reducer cavity.

2. The dual-motor powertrain according to claim 1, characterized in that: The motor shaft hole along the axial direction of the dual-motor powertrain is used to align with an input wheel of the parallel shaft gear set, and the input wheel is used to mesh with the intermediate wheel. The differential shaft hole along the axial direction of the dual-motor powertrain is used to align with the differential, wherein: The distance between the center of the one motor shaft hole and the center of the one differential shaft hole is smaller than the distance between the center of at least one of the one motor shaft hole or the one differential shaft hole and the center of the other motor shaft hole, and the one oil collecting protrusion is arranged between the one motor shaft hole and the one differential shaft hole along the radial direction of the dual-motor powertrain.

3. The dual-motor powertrain according to claim 2, characterized in that: The distance between the one oil collecting protrusion and the center of the one differential shaft hole is smaller than the distance between the one oil collecting protrusion and the center of the one motor shaft hole.

4. The dual-motor powertrain according to claim 3, characterized in that: The cavity wall of the one motor cavity comprises an oil return hole, and the one oil return hole is used to connect the one motor cavity and the one reducer cavity, wherein: Along the radial direction of the dual-motor power assembly, the oil return hole is arranged between the motor shaft hole and the oil collecting protrusion, and the distance between the center of the oil return hole and the oil collecting protrusion is smaller than the distance between the center of the oil return hole and the center of the motor shaft hole.

5. The dual-motor powertrain according to claim 1, characterized in that: The other intermediate wheel of the parallel shaft gear set is used to mesh with the output wheel, and the bearing groove along the axial direction of the dual-motor powertrain is used to align with the intermediate wheel and the other intermediate wheel, wherein: The distance between the one oil collecting protrusion and the center of the one bearing groove is smaller than the distance between the one oil collecting protrusion and the center of any one of the one motor shaft hole and the one differential shaft hole.

6. The dual-motor powertrain according to claim 1, characterized in that: Along the axial direction of the dual-motor powertrain, the oil collecting protrusion protrudes toward the intermediate wheel, and the distance between the oil collecting protrusion and the intermediate wheel is smaller than the distance between the differential shaft hole and the intermediate wheel.

7. The dual-motor powertrain according to claim 1, characterized in that: Along the axial direction of the dual-motor power assembly, the one oil collecting protrusion is protruded toward the one output wheel, and the distance between the one oil collecting protrusion and the one output wheel is smaller than the distance between the one differential shaft hole and the one output wheel.

8. The dual-motor powertrain according to any one of claims 1 to 7, characterized in that: The oil collecting protrusion includes two oil collecting sections, one end of the oil collecting section intersects with one end of the other oil collecting section, the other end of the one oil collecting section is spaced apart from the other end of the other oil collecting section, and the opening of the angle between the one oil collecting section and the other oil collecting section along the radial direction of the dual-motor powertrain is toward the one motor shaft hole and away from the one differential shaft hole.

9. The dual-motor powertrain according to claim 8, characterized in that: The distance between the other end of the one oil collecting section and the center of the one bearing groove is smaller than the distance between the other end of the other oil collecting section and the center of the other motor shaft hole.

10. The dual-motor powertrain according to any one of claims 1 to 7, characterized in that: The oil collecting protrusion includes a through-hole, which passes through one end of the oil collecting protrusion, and the distance between the center of the through-hole and the center of the differential shaft hole is smaller than the distance between the other end of the oil collecting protrusion and the center of the differential shaft hole.

11. The dual-motor powertrain according to claim 10, characterized in that: The differential comprises a planetary shaft and a differential gear set, wherein the planetary shaft is used for driving connection with the differential gear set, wherein: The one flow hole is at least partially aligned with the one planetary shaft in the radial direction of the dual-motor powertrain, the inner diameter of the one flow hole is less than or equal to the outer diameter of the one planetary shaft, the one flow hole is used to guide the lubricating oil to the one planetary shaft, and the one planetary shaft is used to throw the lubricating oil to the one differential gear set.

12. The dual-motor powertrain according to any one of claims 1 to 7, characterized in that: The cavity wall of the reducer cavity further comprises an oil spray hole, the oil spray hole is used to fix a nozzle, and the nozzle is used to spray lubricating oil to the oil collecting protrusion, wherein: The one oil injection hole is arranged between the one oil collecting protrusion and the other motor shaft hole, and the distance between the center of the one oil injection hole and the one oil collecting protrusion is smaller than the distance between the center of the one oil injection hole and the center of the other motor shaft hole.

13. A vehicle, characterized in that: The vehicle includes a frame and a dual-motor powertrain as described in any one of claims 1-12, the frame is used to install the dual-motor powertrain, the one differential of the dual-motor powertrain is used to drive the wheels of the vehicle, and the one oil collecting protrusion is higher than the one differential along the direction of gravity.

14. The vehicle according to claim 13, characterized in that The minimum angle between the oil collecting protrusion and the ground is greater than or equal to 20 degrees and less than or equal to 35 degrees.

Images