Oil cooling power assembly and electric automobile

Abstract

The invention provides an oil cooling power assembly and an electric vehicle. The oil cooling power assembly comprises a speed reducer, a motor, an oil pipe and a plurality of cantilever columns. A motor shaft of the motor is used for being in transmission connection with an input shaft of the speed reducer, the input shaft penetrates through a shaft cavity of the input shaft in the axial direction of the motor, and the oil pipe is used for communicating with the shaft cavity of the motor shaft through the shaft cavity of the input shaft. One end of each cantilever column is used for being fixed to the peripheral face of the oil pipe, the other ends of the multiple cantilever columns are arranged at intervals in the circumferential direction of the motor, and the other end of each cantilever column is spaced from the peripheral face of the oil pipe in the radial direction of the motor. The distance between the other end of each cantilever column in the radial direction of the motor and the central axis of the oil pipe is larger than or equal to the radius of a shaft cavity of the input shaft. The heat dissipation performance of the oil cooling power assembly and the overall performance of the electric automobile are good.

Description

Technical Field

[0001] The present application relates to the technical field of powertrains, and more specifically, to an oil-cooled powertrain and an electric vehicle. Background Art

[0002] Existing electric vehicles usually use an integrated powertrain as the power source. Currently, the powertrain includes multiple components such as a motor, a motor controller, a reducer, and a heat exchanger, making the powertrain large in volume and high in working temperature. To improve the overall performance of the electric vehicle, the powertrain needs to comprehensively consider various design requirements such as miniaturization and heat dissipation performance. Among them, in order to reduce the temperature of the powertrain when it is in the working state and the volume of the powertrain, coolant flow channels are usually arranged in the components of the powertrain, and coolant is introduced into the coolant flow channels for heat exchange to achieve temperature reduction.

[0003] Generally, the motor shaft in the powertrain and the input shaft of the reducer are connected by spline transmission. In this way, the high-speed rotation of the motor shaft will cause relative rotation between the motor shaft and the input shaft, resulting in loosening of the oil-passing components in the input shaft or the motor shaft. Furthermore, it affects the heat dissipation performance of the powertrain. Summary of the Invention

[0004] The present application provides an oil-cooled powertrain and an electric vehicle, and the heat dissipation performance of the oil-cooled powertrain and the overall performance of the electric vehicle are better.

[0005] In a first aspect, an oil-cooled powertrain is provided. The oil-cooled powertrain includes a reducer, a motor, an oil-passing pipe, and a plurality of cantilever columns. Among them, the motor shaft of the motor is used for drivingly connecting the input shaft of the reducer, the shaft cavity of the input shaft penetrates the input shaft along the axial direction of the motor, and the oil-passing pipe is used for communicating the shaft cavity of the motor shaft through the shaft cavity of the input shaft. One end of each cantilever column is used for being fixed on the outer peripheral surface of the oil-passing pipe, the other ends of the plurality of cantilever columns are arranged at intervals along the circumferential direction of the motor, the other end of each cantilever column is spaced from the outer peripheral surface of the oil-passing pipe along the radial direction of the motor, and the distance between the other end of each cantilever column and the central axis of the oil-passing pipe is greater than or equal to the radius of the shaft cavity of the input shaft.

[0006] For the oil-cooled powertrain provided by the present application, since the distance between the free end of each cantilever column and the central axis of the oil-passing pipe is greater than or equal to the radius of the shaft cavity of the input shaft, in this way, when the oil-passing pipe is inserted into the shaft cavity of the input shaft, the free end of each cantilever column can abut against the inner wall of the shaft cavity of the input shaft, which can prevent the oil-passing pipe from axially moving along the input shaft, ensure that the oil-passing pipe rotates synchronously with the input shaft, and furthermore, the oil-passing pipe can stably transport the coolant, preventing impurities from entering the oil-passing pipe so as to affect the heat dissipation performance of the oil-cooled powertrain.

[0007] In addition, by fixing a plurality of cantilever columns on the outer peripheral surface of the oil pipe, the oil pipe can be prevented from axially moving along the input shaft, thereby simplifying the processing technology of the oil-cooled powertrain and the assembly process of the oil pipe and the input shaft.

[0008] In one implementation, the shaft cavity of the input shaft is used to accommodate the oil pipe. The inner circumferential surface of the shaft cavity of the input shaft includes a plurality of grooves, each groove is used to accommodate the other end of at least one cantilever column, and the distance between each groove and the opening of the shaft cavity of the input shaft toward the motor along the motor axis is less than the length of the oil pipe.

[0009] By machining a plurality of grooves on the inner circumference of the shaft cavity of the input shaft, the other end of each cantilever column can be clamped in a groove, so that the other end of the cantilever column can be firmly clamped in the shaft cavity of the input shaft.

[0010] In one implementation, a plurality of grooves are connected along the circumference of the motor to form an annular groove. The annular groove includes a groove bottom and two groove walls arranged opposite to each other along the axial direction of the motor, the groove bottom is used to connect the two groove walls respectively, and the distance between the two groove walls gradually decreases in the direction away from the central axis of the oil pipe in the radial direction of the motor.

[0011] The distance between the two groove walls gradually decreases in the direction radially away from the center axis of the oil pipe along the motor. In this way, during the process of inserting the oil pipe into the axial cavity of the input shaft and during the process of removing the oil pipe from the axial cavity of the input shaft, the axial force between each cantilever column and the axial cavity of the input shaft can be reduced, making the loading and unloading process of the oil pipe relatively simple.

[0012] In addition, by machining an annular groove on the inner peripheral surface of the shaft cavity of the input shaft, the oil pipe can be prevented from axially moving along the input shaft, thereby simplifying the machining process of the input shaft and reducing the machining cost of the input shaft.

[0013] In one implementation, the shaft cavity of the input shaft includes two input shaft cavities connected along the axial direction of the motor, and the size of one input shaft cavity is larger than the size of the other input shaft cavity along the radial direction of the motor. One input shaft cavity is used to accommodate the oil pipe, and the other input shaft cavity is used to accommodate at least a portion of the motor shaft. In this way, the other input shaft cavity can again prevent the universal pipe from moving along the axial direction of the motor.

[0014] In one implementation, the oil-cooled powertrain also includes a support structure, one end of each cantilever column is fixed to the outer circumferential surface of the oil pipe through the support structure, the outer circumferential surface of the support structure includes a plurality of protrusions, the plurality of protrusions are arranged at intervals along the circumference of the motor, and the distance between each protrusion and the central axis of the oil pipe along the radial direction of the motor is greater than or equal to the radius of the shaft cavity of the input shaft.

[0015] By machining a plurality of protrusions on the outer peripheral surface of the support structure, the support structure and the shaft cavity of the input shaft are made to be an interference fit, which can prevent the oil pipe from moving along the radial direction of the motor and further ensure that the oil pipe rotates synchronously with the input shaft.

[0016] In addition, compared to the solution of making the size of the support structure larger so that the distance between the support structure and the central axis of the oil pipe is greater than or equal to the radius of the axial cavity of the input shaft, processing multiple protrusions on the outer circumferential surface of the support structure can reduce the pressure of the axial cavity of the input shaft on the support structure, thereby avoiding failure of the support structure due to excessive pressure.

[0017] In one implementation, the size of each protrusion along the motor axial direction is greater than the size of each protrusion along the motor radial direction. In this way, by machining relatively few protrusions on the outer peripheral surface of the support structure, the oil pipe can be prevented from moving along the motor radial direction, simplifying the machining process of the support structure and reducing the machining cost of the support structure.

[0018] In one implementation, the oil-cooled powertrain further includes at least one weight-reducing groove, the size of each weight-reducing groove along the motor axis is smaller than the size of the cantilever column or the supporting structure, and the plurality of weight-reducing grooves are arranged at intervals along the motor circumference. In this way, the cantilever column or the supporting structure can be lightweight, so that the oil-cooled powertrain can be lightweight.

[0019] In one implementation, the size of each cantilever column along the motor axis is greater than or equal to the support structure. The distance between the support structure and one end of the oil pipe along the motor axis is less than the distance between the support structure and the other end of the oil pipe. In this way, the elasticity of the other end of each cantilever column is improved, so that the other end of each cantilever column can move flexibly along the motor radial direction.

[0020] In one implementation, the side of the other end of each cantilever column away from the oil pipe includes a protrusion, each protrusion is used to be embedded in the shaft cavity of the input shaft, and the size of each protrusion along the axial direction of the motor and in the radial direction of the motor away from the central axis of the oil pipe first increases and then decreases.

[0021] In this way, during the process of inserting the oil pipe into the shaft cavity of the input shaft and removing the oil pipe from the shaft cavity of the input shaft, the axial force between each protrusion on each cantilever column and the shaft cavity of the input shaft can be reduced, making the loading and unloading process of the oil pipe relatively simple.

[0022] In addition, by processing a protrusion on the side of the other end of the cantilever column facing away from the oil pipe, during the process of inserting the oil pipe into the shaft cavity of the input shaft, each protrusion at the other end of each cantilever column can be embedded in a groove on the inner circumferential surface of the shaft cavity of the input shaft, so that the oil pipe and the shaft cavity of the input shaft can be firmly fixed, simplifying the processing technology of the oil pipe and reducing the processing cost of the oil pipe.

[0023] In one implementation, there is a gap between one ends of two cantilever columns arranged adjacent to each other along the circumferential direction of the motor. In this way, from the outside of the shaft cavity of the input shaft, a special tool is used to hook the oil delivery pipe through the gap between two cantilever columns arranged adjacent to each other along the circumferential direction of the motor, and the oil delivery pipe is hooked out from the shaft cavity of the input shaft, so that the disassembly process of the oil delivery pipe is simple and the disassembly efficiency of the oil delivery pipe is improved.

[0024] In one implementation, the oil delivery pipe and the motor shaft are arranged along the axial direction of the motor. The shaft cavity of the motor shaft includes two motor shaft cavities communicating along the axial direction of the motor. The size of one motor shaft cavity is larger than that of the other motor shaft cavity along the radial direction of the motor. Among them: one motor shaft cavity is used to accommodate part of the oil delivery pipe along the axial direction of the motor. In this way, the other motor shaft cavity can prevent the general pipe from moving along the axial direction of the motor again.

[0025] In one implementation, there is a gap between the outer peripheral surface of the oil delivery pipe and one motor shaft cavity along the radial direction of the motor, and there is a gap between the oil delivery pipe and the other motor shaft cavity along the axial direction of the motor. In this way, it can ensure that there is enough safety gap between the oil delivery pipe and the motor shaft.

[0026] In one implementation, the oil-cooled powertrain further includes a sealing structure. The oil delivery pipe is used to be sealed and fixed with the inner wall of the shaft cavity of the input shaft through the sealing structure. The oil delivery pipe, the sealing structure, and the input shaft are arranged in sequence along the radial direction of the motor. The cantilever column, the sealing structure, and the motor shaft are arranged at intervals in sequence along the axial direction of the motor. In this way, the sealing structure can not only support the oil delivery pipe on the side away from the motor shaft, but also realize the sealing and fixing between the oil delivery pipe and the cavity of the input shaft.

[0027] In one implementation, one end of the oil delivery pipe is arranged on the side away from the motor shaft with respect to the other end of the oil delivery pipe along the axial direction of the motor. Among them, the distance between the sealing structure and one end of the oil delivery pipe along the axial direction of the motor is greater than the distance between the sealing structure and the other end of the oil delivery pipe. The distance between the sealing structure and the other end of the oil delivery pipe along the axial direction of the motor is equal to the distance between the other end of the cantilever column and one end of the oil delivery pipe. The distances between the sealing structure and the support structure along the axial direction of the motor are respectively greater than the distance between the sealing structure and the other end of the oil delivery pipe and the distance between the support structure and one end of the oil delivery pipe. In this way, when the oil delivery pipe with the support structure and the sealing structure is installed in the shaft cavity of the input shaft, the center of gravity of the oil delivery pipe can be located on the central axis of the oil delivery pipe, reducing the unbalance of the powertrain.

[0028] In a second aspect, an electric vehicle is provided. The electric vehicle includes wheels, a transmission mechanism, and the oil-cooled powertrain according to any one of the first aspect and the possible implementation manners of the first aspect. The oil-cooled powertrain drives the wheels through the transmission mechanism.

[0029] According to the description of the technical effects of the first aspect above, the oil-cooled powertrain has good heat dissipation performance. Furthermore, the overall performance of the electric vehicle is good. Description of the Drawings

[0030] Figure 1 This is a schematic structural diagram of an electric vehicle provided by an embodiment of the present application.

[0031] Figure 2 This is an exploded structural diagram of an oil-cooled powertrain provided by an embodiment of the present application.

[0032] Figure 3 This is another exploded structural diagram of an oil-cooled powertrain provided by an embodiment of the present application.

[0033] Figure 4 This is a schematic structural diagram of a reducer end cover provided by an embodiment of the present application.

[0034] Figure 5 This is a schematic cross-sectional view of a reducer end cover provided by an embodiment of the present application.

[0035] Figure 6 This is another schematic cross-sectional view of a reducer end cover provided by an embodiment of the present application.

[0036] Figure 7 This is a schematic diagram of a partial cross-section of an oil-cooled powertrain provided by an embodiment of the present application.

[0037] Figure 8 This is a schematic cross-sectional view of a motor shaft provided by an embodiment of the present application.

[0038] Figure 9 This is a schematic cross-sectional view of an input shaft provided by an embodiment of the present application.

[0039] Figure 10 For Figure 7 An enlarged schematic view of part A of the oil-cooled powertrain shown.

[0040] Figures 11 to 13 These are schematic structural diagrams of an oil pipe provided by an embodiment of the present application respectively.

[0041] Figure 14 For Figure 7 An enlarged schematic view of part B of the oil-cooled powertrain shown.

[0042] Figures 15 to 17 Respectively Figure 2 Schematic structural diagrams of the oil guiding member of the oil-cooled powertrain shown in

[0043] Figure 18 And Figure 19 Respectively Figure 2Schematic cross-sectional view of the oil-cooled powertrain shown in

[0044] Figure 20 is Figure 2 Schematic cross-sectional view of the assembly of the oil guide part and the reducer end cover in the oil-cooled powertrain shown in

[0045] Figures 21 to 23 respectively are Figure 3 Schematic structural view of the oil guide part of the oil-cooled powertrain shown in

[0046] Figure 24 and Figure 25 respectively are Figure 3 Schematic cross-sectional view of the oil-cooled powertrain shown in Detailed implementation manners

[0047] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0048] In the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; herein, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0049] The terms "upper", "lower", "inner", "outer", etc. in the embodiments of the present application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.

[0050] Referring to "some embodiments" described in this specification means that in one or more embodiments of the present application, specific features, structures, or characteristics described in combination with the embodiment are included. Thus, the statements "in some embodiments" etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0051] The "equal / to be equal to" involved in the present application is not strictly equal / to be equal to, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. "Perpendicular" is not strictly perpendicular, but within the allowable error range.

[0052] In the embodiments of the present application, the same reference numeral represents the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings. The reference numeral also applies to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0053] The embodiments of the present application provide an oil-cooled powertrain. The oil-cooled powertrain includes a reducer, a motor, an oil pipe, and a plurality of cantilever columns. Among them, the motor shaft of the motor is used for driving connection with the input shaft of the reducer. The shaft cavity of the input shaft penetrates the input shaft along the axial direction of the motor. The oil pipe is used to communicate with the shaft cavity of the motor shaft through the shaft cavity of the input shaft. One end of each cantilever column is used to be fixed on the outer peripheral surface of the oil pipe. The other ends of the plurality of cantilever columns are arranged at intervals along the circumferential direction of the motor. Along the radial direction of the motor, the other end of each cantilever column is spaced from the outer peripheral surface of the oil pipe. Along the radial direction of the motor, the distance between the other end of each cantilever column and the central axis of the oil pipe is greater than or equal to the radius of the shaft cavity of the input shaft.

[0054] Since the distance between the free end of each cantilever column and the central axis of the oil pipe is greater than or equal to the radius of the shaft cavity of the input shaft, in this way, when the oil pipe is inserted into the shaft cavity of the input shaft, the free end of each cantilever column can abut against the inner wall of the shaft cavity of the input shaft, which can prevent the oil pipe from axially moving along the input shaft, ensure that the oil pipe rotates synchronously with the input shaft, and further, the oil pipe can stably transport the coolant and prevent impurities from entering the oil pipe so as to affect the heat dissipation performance of the oil-cooled powertrain. In addition, by fixedly arranging a plurality of cantilever columns on the outer peripheral surface of the oil pipe, the axial movement of the oil pipe along the input shaft can be avoided, and the processing technology of the oil-cooled powertrain and the assembly technology of the oil pipe and the input shaft are simplified.

[0055] The embodiments of the present application also provide an electric vehicle. The following will be combined with Figure 1 to describe the electric vehicle provided by the embodiments of the present application in detail.

[0056] Figure 1 It is a schematic structural diagram of an electric vehicle provided by the embodiments of the present application. As Figure 1 shown, the electric vehicle includes one or more oil-cooled powertrains 10, a battery 20, and wheels 30. Among them, the oil-cooled powertrain 10 is used to receive power supply from the battery 20 and drive the wheels 30. The oil-cooled powertrain 10 is used to convert electrical energy into mechanical energy.

[0057] The electric vehicles provided by the embodiments of the present application include pure electric vehicles, hybrid electric vehicles, range extended electric vehicles, plug-in hybrid electric vehicles, or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicle, or simply HEV. Range extended electric vehicles are also called range extended electric vehicle, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicle, or simply PHEV. New energy vehicles are also called new energy vehicle, or simply NEV.

[0058] The following will combine Figures 2 to 25 to describe in detail the structure of the oil-cooled powertrain 10 provided by the embodiments of the present application.

[0059] The oil-cooled powertrain 10 includes a housing. The housing includes a motor accommodation cavity for accommodating a motor, and the motor is used to provide power for the oil-cooled powertrain 10. The motor accommodation cavity penetrates the housing along the axial direction of the motor. The oil-cooled powertrain 10 further includes a motor end cover for covering the opening of the motor accommodation cavity, and the opening of the motor accommodation cavity faces away from the axial direction of the motor.

[0060] The housing further includes a controller accommodation cavity for accommodating a motor controller, and the motor controller is used to control the start or stop, forward or reverse rotation, increase or decrease of speed, increase or decrease of driving torque, increase or decrease of braking torque, etc. of the motor. The controller accommodation cavity and the motor accommodation cavity are arranged in a first direction. The oil-cooled powertrain 10 further includes a motor controller cover plate for covering the opening of the controller accommodation cavity, and the opening of the controller accommodation cavity faces a second direction.

[0061] The housing further includes a reducer accommodation cavity for accommodating a reducer. The reducer accommodation cavity and the motor accommodation cavity are arranged and communicated along the axial direction of the motor, and the controller accommodation cavity is not communicated with the reducer accommodation cavity and the motor accommodation cavity. The oil-cooled powertrain 10 further includes a reducer end cover 210 as shown in Figure 2 or Figure 3 for covering the opening of the reducer accommodation cavity, and the opening of the reducer accommodation cavity faces the axial direction of the motor.

[0062] In some embodiments, the first direction, the second direction, and the motor axial direction are perpendicular to each other. It should be noted that the motor axial direction refers to the axial direction of the motor shaft, which can also be called the axial direction of the input shaft of the reducer. In addition, the motor radial direction can also be called the radial direction of the input shaft of the reducer, and the motor circumferential direction can also be called the circumferential direction of the input shaft of the reducer.

[0063] The oil-cooled powertrain 10 also includes a motor, which includes Figure 2 or Figure 3 The motor shaft 110, the motor rotor and the motor stator are shown. The motor rotor is used for transmission connection with the motor shaft 110. The motor shaft 110 passes through the shaft hole of the motor rotor, so that the motor rotor is sleeved on the motor shaft. The motor rotor passes through the shaft hole of the motor stator, so that the motor stator is sleeved on the motor rotor.

[0064] In some embodiments, the motor shaft 110 includes two end surfaces that are arranged opposite to each other along the motor shaft direction, and the shaft cavity of the motor shaft 110 is recessed from one of the two end surfaces of the motor shaft 110 toward the inside of the motor shaft 110 .

[0065] In other embodiments, Figure 7 and Figure 8 As shown, the shaft cavity Q1 of the motor shaft 110 passes through the motor shaft 110 along the motor shaft. Further, in some embodiments, as Figure 7 and Figure 8 As shown, the shaft cavity of the motor shaft includes two motor shaft cavities connected along the motor axial direction and a motor shaft cavity Q along the motor radial direction. 11 The size is larger than the other motor shaft cavity Q 12 .

[0066] like Figure 2 and Figure 8 As shown, the outer circumference of the motor shaft 110 includes a plurality of protrusions 111, each of which protrudes from the outer circumference of the motor shaft 110 toward a side away from the inner part of the motor shaft 110, and the plurality of protrusions 111 on the outer circumference of the motor shaft 110 are arranged at intervals along the circumferential direction of the motor, and the plurality of protrusions 111 on the outer circumferential surface of the motor shaft 110 surround the outer circumferential surface of the motor shaft 110 along the circumferential direction of the motor. In this way, the plurality of protrusions 111 on the outer circumferential surface of the motor shaft 110 form an external spline of the motor shaft 110.

[0067] In some embodiments, the size of each protrusion 111 on the outer circumference of the motor shaft 110 along the motor axis is smaller than the size of the motor shaft 110. Further, in some embodiments, each protrusion 111 on the outer circumference of the motor shaft 110 along the motor axis extends from one end A1 of the motor shaft 110 to the other end A2 of the motor shaft 110. In this way, the processing cost of the motor shaft 110 can be reduced.

[0068] The oil-cooled powertrain 10 further includes a speed reducer, which is drivingly connected to the motor and is used to adjust the output speed and torque of the motor. The speed reducer includes an input shaft 120 of the speed reducer as shown in Figure 2 or Figure 3 . The end cover of the speed reducer is rotatably connected to the input shaft 120.

[0069] The input shaft 120 is drivingly connected to the motor shaft 110. As shown in Figure 2 and Figure 9 , the inner circumferential surface of the input shaft 120 includes a plurality of protrusions 121. Each protrusion 121 on the inner circumferential surface of the input shaft 120 protrudes from the inner circumferential surface of the input shaft 120 toward the side facing the inside of the input shaft 120. The plurality of protrusions 121 on the inner circumferential surface of the input shaft 120 are arranged at intervals along the circumferential direction of the motor, and the plurality of protrusions 121 on the inner circumferential surface of the input shaft 120 surround the inner circumferential surface of the input shaft 120 in one circle along the circumferential direction of the motor. In this way, the plurality of protrusions 121 on the inner circumferential surface of the input shaft 120 form an internal spline of the input shaft 120. Furthermore, the input shaft 120 is drivingly connected to the motor shaft 110 through the cooperation of the internal spline on the inner circumferential surface of the input shaft 120 and the external spline on the outer circumferential surface of the motor shaft 110.

[0070] In some embodiments, the size of each protrusion 121 on the inner circumferential surface of the input shaft 120 along the axial direction of the motor is smaller than the size of the input shaft 120. Further, in some embodiments, each protrusion 121 on the inner circumferential surface of the input shaft 120 along the axial direction of the motor extends from one end A1 of the input shaft 120 to the other end A2 of the input shaft 120. In this way, the processing cost of the input shaft 120 can be reduced.

[0071] In some embodiments, as shown in Figure 7 , the shaft cavity Q2 of the input shaft 120 along the axial direction of the motor penetrates through the input shaft 120, and the shaft cavity Q2 of the input shaft 120 is used to accommodate at least a part of the oil pipe 130 and the motor shaft 110.

[0072] In some embodiments, the inner circumferential surface of the shaft cavity of the input shaft 120 includes a plurality of grooves, and each groove is used to accommodate the other end of at least one cantilever column. Along the axial direction of the motor, the distance between each groove and the opening of the shaft cavity of the input shaft facing the motor is smaller than the length of the oil pipe 130.

[0073] Further, as shown in Figure 2 , Figure 7 and Figure 9 , the plurality of grooves communicate with each other along the circumferential direction of the motor to form an annular groove G1. As shown in Figure 9 and Figure 14 , the annular groove G1 includes a groove bottom G 11 and two groove walls G 12 -G 13 arranged opposite to each other along the axial direction of the motor. The groove bottom G11 respectively used to connect two slot walls G 12 -G 13 , the distance between the two slot walls G in the direction radially away from the central axis of the oil pipe 130 along the motor 12 -G 13 gradually decreases.

[0074] In some embodiments, the distance between the bottom of the slot G 11 and the central axis of the oil pipe 130 is related to the magnitude of the pulling-out force / pressing-in force of the oil pipe 130. For example, when other parameters such as the number of cantilever columns 140, the dimensions of the cantilever columns 140 along the circumferential direction of the motor, and the dimensions of the inner cavity of the input shaft 120 remain unchanged, the distance between the bottom of the slot G 11 and the central axis of the oil pipe 130 may have a positive correlation with the magnitude of the pulling-out force / pressing-in force of the oil pipe 130.

[0075] In some embodiments, the angle between the slot wall G 12 or the slot wall G 13 and the bottom of the slot G 11 is related to the magnitude of the pulling-out force / pressing-in force of the oil pipe 130. For example, when other parameters such as the number of cantilever columns 140, the dimensions of the cantilever columns 140 along the circumferential direction of the motor, and the dimensions of the inner cavity of the input shaft 120 remain unchanged, the angle between the slot wall G 12 or the slot wall G 13 and the bottom of the slot G 11 may have a negative correlation with the magnitude of the pulling-out force / pressing-in force of the oil pipe 130.

[0076] In some embodiments, as shown in Figure 2 and Figure 9 , the shaft cavity Q2 of the input shaft 120 includes two input shaft cavities communicating axially along the motor, and the size of one input shaft cavity Q 21 is larger than that of the other input shaft cavity Q 22 . Among them, one input shaft cavity Q 21 is used to accommodate the oil pipe 130 described below, and the other input shaft cavity Q 22 is used to accommodate at least a part of the motor shaft 110. In some embodiments, a chamfer is provided on one side of one input shaft cavity Q 21 facing away from the other input shaft cavity Q 22 . In this way, the oil pipe 130 described below can be quickly inserted into the shaft cavity of the input shaft along the chamfer on one side of one input shaft cavity Q 21 , improving the assembly efficiency of the oil pipe 130.

[0077] In some embodiments, one input shaft cavity Q 21The angle of the chamfer on one side is related to the magnitude of the axial force received by the through oil pipe 130. For example, when other parameters such as the number of cantilever columns 140, the dimensions of the cantilever columns 140 along the circumferential direction of the motor, and the dimensions of the annular groove G1 remain unchanged, an input shaft cavity Q 21 The angle of the chamfer on one side and the axial force received by the through oil pipe 130 can have a positive correlation.

[0078] Such as Figures 4 to 6 As shown, the side surface 211 of the reducer end cover 210 includes a radial through hole 211, and the radial through hole 211 is used to communicate with the through oil pipe 130. Among them, the radial through hole 211 forms a radial flow path of the reducer end cover 210.

[0079] In some embodiments, the radial through hole 211 on the reducer end cover 210 is directly communicated with the through oil pipe 130. In this embodiment, along the axial direction of the motor and along the extending direction of the radial through hole 211, the projection of the radial through hole 211 overlaps with the projection of the through oil pipe 130. In this way, the coolant in the radial through hole 211 can flow into the through oil pipe 130 along the radial through hole 211.

[0080] In some embodiments, such as Figure 2 And Figure 3 As shown, the oil-cooled power assembly 10 further includes an oil guiding member 170. The oil guiding member 170 and the through oil pipe 130 are arranged along the axial direction of the motor. The radial through hole 211 on the reducer end cover 210 is communicated with the through oil pipe 130 through the oil guiding member 170. In this way, the oil guiding member 170 can guide the coolant to flow into the through oil pipe 130.

[0081] In this embodiment, the radial through hole 211 is used to communicate with the radial groove 171 of the oil guiding member 170, that is, along the extending direction of the radial through hole 211, the projection of the radial through hole 211 overlaps with the projection of the radial groove 171 of the oil guiding member 170. In this way, the coolant in the radial through hole 211 can flow into the radial groove 171 of the oil guiding member 170 along the radial through hole 211.

[0082] In addition, in this embodiment, as Figures 4 to 6 Shown, the reducer end cover 210 further includes a mounting hole 212. Along the axial direction of the motor, the mounting hole penetrates through the reducer end cover. The mounting hole 212 is communicated with the radial through hole 211, and the mounting hole 212 is used to embed the oil guiding member 170. In this way, without disassembling the housing of the oil-cooled power assembly 10, the oil guiding member 170 can be disassembled from the mounting hole 212 along the axial direction of the motor, making the loading and unloading process of the oil guiding member 170 relatively simple.

[0083] The following combines Figures 7 to 14 To describe in detail the structure of the through oil pipe 130 provided by the embodiments of the present application.

[0084] The oil-cooled power assembly 10 further includes such asFigure 2 The shown oil pipe 130 is used to connect the shaft cavity of the motor shaft 110 through the shaft cavity of the input shaft 120. In other words, the oil pipe 130 is accommodated in the shaft cavity of the input shaft 120 and communicates with the shaft cavity of the motor shaft 110. As Figure 7 shown, the oil pipe 130 and the motor shaft 110 are arranged along the motor axis. As Figure 7 shown, a part of the oil pipe 130 is accommodated in a motor shaft cavity Q of the shaft cavity of the motor shaft 11 . In this way, another motor shaft cavity Q of the shaft cavity of the motor shaft 12 can prevent the general pipe 130 from moving along the motor axis again.

[0085] In some embodiments, as Figure 10 shown, there is a gap J1 between the outer peripheral surface of the oil pipe 130 and a motor shaft cavity Q along the motor radial direction, and there is a gap J2 between the oil pipe 130 and another motor shaft cavity Q along the motor axial direction. 11 In this way, it can ensure that there is enough safety gap between the oil pipe 130 and the motor shaft. 12

[0086] The oil-cooled power assembly 10 further includes a plurality of cantilever columns 140. One end of each cantilever column 140 is used to be fixed on the outer peripheral surface of the oil pipe 130. The other ends of the plurality of cantilever columns 140 are arranged at intervals along the motor circumferential direction. Along the motor radial direction, the other end of each cantilever column 140 is spaced from the outer peripheral surface of the oil pipe 130, and the distance between the other end of each cantilever column 140 and the central axis of the oil pipe 130 is greater than or equal to the radius of the shaft cavity of the input shaft 120.

[0087] In some embodiments, the number of the cantilever columns 140 is related to the magnitude of the pulling force / pressing force of the oil pipe 130. For example, when other parameters such as the dimensions of the cantilever columns 140 along the motor circumferential direction, the dimensions of the annular groove G1, and the dimensions of the inner cavity of the input shaft 120 remain unchanged, the number of the cantilever columns 140 and the pulling force / pressing force of the oil pipe 130 can have a positive correlation.

[0088] In some embodiments, as Figure 7 、 Figures 11 to 14As shown, the other end of each cantilever column 140 facing away from the side of the through-oil pipe 130 includes a protrusion P1. Each protrusion P1 of each cantilever column 140 is used to be embedded in a groove or an annular groove G1 on the inner peripheral surface of the shaft cavity of the input shaft 120. Along the axial direction of the motor, the dimension of each protrusion P1 of each cantilever column 140 in the direction away from the central axis of the through-oil pipe 130 along the radial direction of the motor first increases and then decreases. In this way, during the process of inserting the through-oil pipe 130 into the shaft cavity of the input shaft 120 and during the process of removing the through-oil pipe 130 from the shaft cavity of the input shaft 120, the axial force between each protrusion P1 on each cantilever column 140 and the shaft cavity of the input shaft 120 can be reduced, making the loading and unloading process of the through-oil pipe 130 relatively simple. In addition, by machining the protrusion P1 on the side of the other end of the cantilever column 140 facing away from the through-oil pipe 130, during the process of inserting the through-oil pipe 130 into the shaft cavity of the input shaft 120, each protrusion P1 at the other end of each cantilever column 140 can be embedded in a groove or an annular groove G1 on the inner peripheral surface of the shaft cavity of the input shaft 120, enabling the through-oil pipe 130 and the shaft cavity of the input shaft 120 to be firmly fixed, simplifying the processing technology of the through-oil pipe 130 and reducing the processing cost of the through-oil pipe 130.

[0089] In some embodiments, one end of multiple cantilever columns 140 is directly fixed to the outer peripheral surface of the through-oil pipe 130. For example, each cantilever column 140 includes an axially connected part and a radially connected part. The axially connected part extends along the radial direction of the motor from the outer peripheral surface of the through-oil pipe 130, and the radially connected part extends along the axial direction of the motor. In addition, the part where the axially connected part is connected to the outer peripheral surface of the through-oil pipe 130 is called one end of the cantilever column 140, and the end of the radially connected part facing away from the axially connected part is called the other end of the cantilever column 140. In this way, the structural strength of each cantilever column 140 and the stability between the through-oil pipe 130 and the cantilever column 140 can be enhanced.

[0090] Furthermore, in some embodiments, each cantilever column 140 and the through-oil pipe 130 are integrally formed. In this way, the production cost of the cantilever column 140 is reduced.

[0091] In some other embodiments, the oil-cooled power assembly 10 further includes a support structure 150. Along the radial direction of the motor, the through-oil pipe 130, the support structure 150, and the input shaft 120 are arranged in sequence. Along the axial direction of the motor, the support structure 150 and the motor shaft 110 are arranged at intervals. One end of each cantilever column 140 is fixed to the outer peripheral surface of the through-oil pipe 130 through the support structure 150. In this way, the stability between the through-oil pipe 130 and the cantilever column 140 can be increased.

[0092] Further, in some embodiments, each cantilever column 140, the support structure 150, and the through oil pipe 130 are integrally formed, or each cantilever column 140 and the support structure 150 are integrally formed, or the support structure 150 and the through oil pipe 130 are integrally formed. In this way, the structural strength of each cantilever column 140 can be enhanced.

[0093] In some embodiments, the outer peripheral surface of the support structure 150 or the side surface of the radial part of each cantilever column 140 facing away from the through oil pipe includes a plurality of protrusions P2. The plurality of protrusions P2 are arranged at intervals along the circumferential direction of the motor. Along the radial direction of the motor, the distance between each protrusion P2 and the central axis of the through oil pipe 130 is greater than or equal to the radius of the shaft cavity of the input shaft 120. In this way, by machining a plurality of protrusions P2 on the outer peripheral surface of the support structure 150 or the side surface of the radial part of each cantilever column 140 facing away from the through oil pipe, the fit between the support structure 150 or the cantilever column and the shaft cavity of the input shaft 120 is an interference fit, which can prevent the through oil pipe 130 from moving radially along the motor and further ensure that the through oil pipe 130 rotates synchronously with the input shaft 120. In addition, compared with the solution of making the size of the radial part of the support structure 150 or the cantilever column 140 larger so that the distance between the side of the radial part of the support structure 150 or the cantilever column 140 facing away from the through oil pipe and the central axis of the through oil pipe 130 is greater than or equal to the radius of the shaft cavity of the input shaft 120, machining a plurality of protrusions P2 on the outer peripheral surface of the support structure 150 or the side surface of the radial part of each cantilever column 140 facing away from the through oil pipe can reduce the pressure of the shaft cavity of the input shaft 120 on the support structure 150, thereby avoiding the failure of the support structure 150 due to excessive pressure.

[0094] In some embodiments, the dimension of each protrusion P2 along the axial direction of the input shaft 120 is greater than the dimension of each protrusion P2 along the radial direction of the input shaft 120. In this way, by machining relatively few protrusions P2 on the outer peripheral surface of the support structure 150 or the side surface of the radial part of the cantilever column 140 facing away from the through oil pipe, the through oil pipe 130 can be prevented from moving radially along the motor, simplifying the processing technology of the support structure 150 and reducing the processing cost of the support structure 150.

[0095] In some embodiments, the number of the protrusions P2 is related to the magnitude of the pressing force of the through oil pipe 130. For example, the number of the protrusions P2 and the pressing force of the through oil pipe 130 are in a positive correlation.

[0096] In some embodiments, the difference between the distance between each protrusion P2 and the central axis of the through oil pipe 130 along the radial direction of the motor and the radius of the shaft cavity of the input shaft 120 is related to the magnitude of the pressing force of the through oil pipe 130. For example, the difference and the pressing force of the through oil pipe 130 are in a positive correlation.

[0097] In some embodiments, the radial portion of the cantilever column 140 or the support structure 150 further includes at least one weight-reducing groove T3, and a plurality of weight-reducing grooves are arranged at intervals along the circumferential direction of the input shaft 120. In one example, along the axial direction of the motor, each weight-reducing groove T3 penetrates through the radial portion of the cantilever column 140 or the support structure 150. In another example, as Figure 11 and Figure 13 shown, each weight-reducing groove T3 is recessed from the end face of the radial portion of the cantilever column 140 facing away from the motor shaft 110 or the end face of the support structure 150 facing away from the motor shaft 110 towards the inside of the cantilever column 140 or the support structure 150. Along the axial direction of the motor, the size of each weight-reducing groove T3 is smaller than the size of the radial portion of the cantilever column 140 or the support structure 150. In this way, the cantilever column 140 or the support structure 150 can be lightened, so that the oil-cooled power assembly 10 is lightened.

[0098] In some embodiments, along the axial direction of the motor, the size of each cantilever column 140 is greater than or equal to that of the support structure 150. Along the axial direction of the motor, the distance between the support structure 150 and one end of the through oil pipe 130 is smaller than the distance between the support structure 150 and the other end of the through oil pipe 130. Along the axial direction of the motor, one end of the through oil pipe 130 is arranged on the side away from the motor shaft of the other end of the through oil pipe 130. In this way, the elastic performance of the other end of each cantilever column 140 is improved, so that the other end of each cantilever column 140 can move flexibly along the radial direction of the motor.

[0099] In some embodiments, there is a gap J3 between one ends of two adjacent cantilever columns 140 arranged along the circumferential direction of the motor. In this way, from the outside of the shaft cavity of the input shaft 120, a special tool is used to hook the through oil pipe 130 through the gap J3 between two adjacent cantilever columns 140 arranged along the circumferential direction of the motor, and the through oil pipe 130 is hooked out of the shaft cavity of the input shaft 120, so that the disassembly process of the through oil pipe 130 is simple and the disassembly efficiency of the through oil pipe 130 is improved.

[0100] Exemplarily, the size of the cantilever column 140 along the circumferential direction of the motor is related to the pulling force / pressing force of the through oil pipe 130. For example, when other parameters such as the number of cantilever columns 140, the size of the annular groove G1, and the size of the inner cavity of the input shaft 120 remain unchanged, the size of the cantilever column 140 along the circumferential direction of the motor and the pulling force / pressing force of the through oil pipe 130 can be in a positive correlation.

[0101] In some embodiments, the oil-cooled power assembly 10 further includes a sealing structure 160, and the through oil pipe 130 is used to be fixedly sealed with the inner wall of the shaft cavity of the input shaft 120 through the sealing structure 160. Along the radial direction of the motor, the through oil pipe 130, the sealing structure 160, and the input shaft 120 are arranged in sequence. Along the axial direction of the motor, the cantilever column 140, the sealing structure 160, and the motor shaft are arranged at intervals in sequence.

[0102] In one example, the outer peripheral surface of the sealing structure 160 includes an annular groove G2 for accommodating a sealing ring. The annular groove G2 is recessed from the outer peripheral surface of the sealing structure 160 towards the inside of the sealing structure 160, and the size of the annular groove G2 along the axial direction of the motor is smaller than the size of the sealing structure 160. In this way, the inner wall of the shaft cavity of the oil delivery pipe 130 and the input shaft 120 is hermetically fixed through the sealing ring.

[0103] In another example, the outer peripheral surface of the sealing structure 160 includes a plurality of protrusions. Each protrusion on the outer peripheral surface of the sealing structure 160 protrudes from the outer peripheral surface of the sealing structure 160 towards the outside of the sealing structure 160. The plurality of protrusions on the outer peripheral surface of the sealing structure 160 are arranged at intervals along the circumferential direction of the motor. The distance from each protrusion on the outer peripheral surface of the sealing structure 160 to the central axis of the oil delivery pipe is greater than or equal to the radius of the shaft cavity of the input shaft along the radial direction of the motor. In this way, by machining a plurality of protrusions on the outer peripheral surface of the sealing structure 160, the fit between the sealing structure 160 and the shaft cavity of the input shaft is an interference fit, realizing the hermetic fixation of the inner wall of the shaft cavity of the oil delivery pipe 130 and the input shaft 120, and can prevent the oil delivery pipe from moving along the radial direction of the motor again, further ensuring that the oil delivery pipe rotates synchronously with the input shaft. In addition, compared with the solution of making the size of the sealing structure larger so that the distance between the sealing structure and the central axis of the oil delivery pipe is greater than or equal to the radius of the shaft cavity of the input shaft, machining a plurality of protrusions on the outer peripheral surface of the sealing structure can reduce the pressure of the shaft cavity of the input shaft on the sealing structure, thereby avoiding the failure of the sealing structure due to excessive pressure.

[0104] In some embodiments, the distance between the sealing structure 160 and one end of the oil delivery pipe 130 along the axial direction of the motor is greater than the distance between the sealing structure 160 and the other end of the oil delivery pipe 130. The distance between the sealing structure 160 and the other end of the oil delivery pipe 130 along the axial direction of the motor is equal to the distance between the other end of the cantilever column 140 and one end of the oil delivery pipe 130. The distances between the sealing structure 160 and the support structure 150 along the axial direction of the motor are respectively greater than the distance between the sealing structure 160 and the other end of the oil delivery pipe 130 and the distance between the support structure 150 and one end of the oil delivery pipe 130. In this way, when the oil delivery pipe 130 with the support structure 150 and the sealing structure 160 is inserted into the shaft cavity of the input shaft 120, the center of gravity of the oil delivery pipe 130 can be located on the central axis of the oil delivery pipe 130, reducing the unbalance of the oil-cooled power assembly 10.

[0105] In some embodiments, such as Figure 12As shown, the end face of the sealing structure 160 facing away from the cantilever column 140 further includes at least one weight-reducing groove T4, and a plurality of weight-reducing grooves T4 are arranged at intervals along the circumferential direction of the input shaft 120. In one example, each weight-reducing groove T4 is recessed from the end face facing away from the cantilever column 140 towards the inside of the sealing structure 160, and the size of each weight-reducing groove T4 along the axial direction of the motor is smaller than the size of the sealing structure 160. In another example, each weight-reducing groove T4 penetrates through the sealing structure 160 along the axial direction of the motor. In this way, the sealing structure 160 can be lightened, enabling the oil-cooled power assembly 10 to be lightened.

[0106] In some embodiments, the outer peripheral surface of the through oil pipe 130 further includes at least one group of radial through holes, each group of radial through holes includes at least one radial through hole, and a plurality of radial through holes are arranged at intervals along the circumferential direction of the motor, and each radial through hole penetrates through the through oil pipe 130 along the radial direction of the motor.

[0107] Exemplarily, as Figure 11 and Figure 12 shown, a group of radial through holes T1 are arranged between each cantilever column 140 and the sealing structure 160 along the axial direction of the motor. In this way, the coolant in the through oil pipe 130 can flow into the gap between the through oil pipe 130 and the shaft cavity of the input shaft 120 along each radial through hole T1, and flow along the gap between two adjacent arranged cantilever columns 140 to the bearing on the input shaft 120 of the reducer, so as to lubricate the bearing on the input shaft 120 of the reducer and reduce the wear between the input shaft 120 and the bearing. In addition, the plurality of radial through holes T1 are arranged at intervals along the circumferential direction of the motor, so that the coolant can flow to the bearing on the input shaft 120 of the reducer from different positions, improving the lubrication effect of the coolant on the bearing on the input shaft 120 of the reducer and avoiding bearing failure.

[0108] Exemplarily, as Figure 11 and Figure 12 shown, each radial through hole T2 of another group of radial through holes T2 along the axial direction of the motor communicates with the end face of the through oil pipe 130 facing the motor shaft 110. In this way, the coolant in the through oil pipe 130 can flow into the gap between the through oil pipe 130 and the shaft cavity of the motor shaft 110 along each radial through hole T2, and flow along the gap between the through oil pipe 130 and the shaft cavity of the motor shaft 110 to the space between the external spline on the outer peripheral surface of the motor shaft 110 and the internal spline in the shaft cavity of the input shaft 120, so as to lubricate the spline transmission between the motor shaft 110 and the input shaft 120 and reduce the wear between the input shaft 120 and the motor shaft 110. In addition, the plurality of radial through holes T2 are arranged at intervals along the circumferential direction of the motor, so that the coolant can flow to the space between the external spline on the outer peripheral surface of the motor shaft 110 and the internal spline in the shaft cavity of the input shaft 120 from different positions, improving the lubrication effect of the coolant on the spline transmission between the motor shaft 110 and the input shaft 120 and avoiding the failure of the spline transmission between the motor shaft 110 and the input shaft 120.

[0109] In some embodiments, such as Figure 11 and Figure 12 shown, along the axial direction of the motor, each cantilever column 140, a set of radial through-holes T1, and the sealing structure 160 are arranged at intervals in sequence. In this way, crosstalk between the coolant flowing to the bearing on the input shaft 120 of the speed reducer and the coolant flowing to the other end of the through-oil pipe 130 can be avoided, and the lubrication effect on the bearing of the speed reducer and the connection between the motor shaft 110 and the speed reducer can be improved.

[0110] In some embodiments, the distance between each radial through-hole T1 of a set of radial through-holes T1 and each cantilever column 140 along the axial direction of the motor is equal to the distance between each radial through-hole T1 of the set of radial through-holes T1 and the sealing structure 160. In this way, the coolant flowing from each radial through-hole T1 of the set of radial through-holes T1 to the bearing on the input shaft 120 of the speed reducer and the coolant flowing to the other end of the through-oil pipe 130 are relatively uniform.

[0111] In some embodiments, the distances between another set of radial through-holes T2 and the sealing structure 160 are respectively smaller than the distances between each cantilever column 140 and the sealing structure 160, and the distances between the set of radial through-holes T1 and the sealing structure 160 or each cantilever column 140. On the one hand, the distance between the sealing structure 160 and another set of radial through-holes T2 is relatively small, which can shorten the cooling path of the coolant between another set of radial through-holes T2 and the sealing structure 160 and reduce the loss of the coolant. On the other hand, the distances between each cantilever column 140 and the sealing structure 160 and between the sealing structure 160 and the set of radial through-holes T1 are relatively large, which can avoid interference between the coolant flowing to the bearing on the input shaft 120 of the speed reducer and the coolant flowing to the other end of the through-oil pipe 130, and is beneficial to improving the lubrication effect on the spline transmission between the bearing of the speed reducer, the motor shaft 110, and the input shaft 120.

[0112] In some embodiments, such as Figure 11 and Figure 12 shown, the outer peripheral surface of the through-oil pipe 130 includes at least one groove G3, and a plurality of grooves G3 on the outer peripheral surface of the through-oil pipe 130 are arranged at intervals along the circumferential direction of the motor. Each groove G3 on the outer peripheral surface of the through-oil pipe 130 is recessed from the outer peripheral surface of the through-oil pipe 130 towards the inside of the through-oil pipe 130, and each groove G3 on the outer peripheral surface of the through-oil pipe 130 along the axial direction of the motor communicates with one radial through-hole T2 of another set of radial through-holes T2. In this way, the coolant flowing out from each radial through-hole T2 can flow along each groove G3 to between the external spline on the outer peripheral surface of the motor shaft 110 and the internal spline in the shaft cavity of the input shaft 120.

[0113] In some embodiments, the size of each groove G3 on the outer peripheral surface of the oil pipe 130 along the axial direction of the motor is larger than the size of each radial through-hole T2. On the one hand, the size of each radial through-hole T2 along the axial direction of the motor is relatively small, which can avoid opening an overly large through-hole at the end face of the oil pipe 130 and improve the structural strength of the oil pipe 130. On the other hand, the size of each groove G3 on the outer peripheral surface of the oil pipe 130 along the axial direction of the motor is relatively large, which is conducive to each groove G3 on the outer peripheral surface of the oil pipe 130 playing a role in guiding the flow direction. If the length of each groove G3 on the outer peripheral surface of the oil pipe 130 is too short, it may cause the coolant to be difficult to flow to the external spline on the outer peripheral surface of the motor shaft 110 and the internal spline in the shaft cavity of the input shaft 120.

[0114] In some embodiments, the size of each groove G3 on the outer peripheral surface of the oil pipe 130 along the circumferential direction of the motor is larger than the size of each radial through-hole T2. This is conducive to reducing the flow resistance of the coolant in each groove G3 on the outer peripheral surface of the oil pipe 130.

[0115] The following will Figures 15 to 25 describe in detail the structure of the oil guiding member provided in the embodiments of the present application.

[0116] As Figures 15 to 17 、 Figures 21 to 23 shown, the oil guiding member 170 includes an outer peripheral surface and two end faces arranged oppositely along the axial direction of the motor. Among them, the outer peripheral surface of the oil guiding member 170 includes a radial groove 171, and the end face of the oil guiding member 170 facing the oil pipe 130 includes an axial oil guiding hole 172. One end of the axial oil guiding hole 172 is communicated with the radial groove 171, and the other end of the axial oil guiding hole 172 is used to communicate with the oil pipe 130. Since both the radial groove 171 and the axial oil guiding hole 172 are provided on the oil guiding member 170, and both the radial groove 171 and the axial oil guiding hole 172 are arranged independently of other components of the oil-cooled power assembly 10, that is, the oil guiding member 170 does not need to jointly form an oil guiding flow channel with other components of the oil-cooled power assembly 10 such as the reducer end 210 cover. Therefore, almost all of the coolant of the oil guiding member 170 can flow into the axial oil guiding hole 172 and then into the oil pipe 130, reducing the leakage amount of the coolant and improving the utilization rate of the coolant.

[0117] As Figure 15 、 Figure 16 、 Figure 21 、 Figure 22As shown, the radial groove 171 includes a groove wall 1711 and another groove wall 1712 that are arranged opposite to each other along the circumferential direction of the motor. Along the radial direction of the motor away from the central axis of the oil guiding member 170, the distance between the groove wall 1711 and the other groove wall 1712 gradually increases. That is, along the radial direction of the motor towards the central axis of the oil guiding member 170, the circumferential dimension of the radial groove 171 of the oil guiding member 170 is different and gradually decreases. In this way, the flow resistance of the coolant in the radial groove 171 of the oil guiding member 170 is small, so that the flow rate of the coolant in the oil-cooled power assembly 10 is relatively fast. Furthermore, the heat dissipation performance of the oil-cooled power assembly 10 is improved.

[0118] In some embodiments, the range of the angle θ between one groove wall 1711 and the other groove wall 1712 is 30° to 60°.

[0119] As Figure 16 and Figure 22 shown, the radial groove 171 includes a groove bottom 1713 and a groove opening 1714 that are arranged opposite to each other along the radial direction of the motor. In some embodiments, the distance between the groove bottom 1713 and the groove opening 1714 along the radial direction of the motor is equal to the maximum distance between the axial oil guiding hole 172 and the groove opening 1714. In this way, the coolant flowing into the radial groove 171 can immediately flow into the axial oil guiding hole 172 without waiting to fill the accommodation space along the radial direction of the motor between the groove bottom 1713 and the axial oil guiding hole 172, thereby effectively reducing the flow resistance of the coolant.

[0120] In some embodiments, the projection of the groove bottom 1713 of the radial groove 171 along the axial direction of the motor is a curve, and the bending direction of the curve is away from the groove opening 1714 of the radial groove 171. The radius of curvature of the curve is equal to the radius of the axial oil guiding hole 172. The dimension range of the outer peripheral surface of the oil guiding member 170 along the axial direction of the motor is 7 - 12 mm. In this way, the flow resistance of the coolant can be reduced.

[0121] In some embodiments, the inner diameter of the axial oil guiding hole 172 is less than or equal to the minimum dimension of the radial groove 171 along the circumferential direction of the motor. The dimension range of the outer peripheral surface of the oil guiding member 170 along the axial direction of the motor is 7 - 12 mm. In this way, the flow resistance of the coolant can be further reduced.

[0122] In some embodiments, the oil-cooled power assembly 10 further includes at least one sleeve structure. The axial oil guiding hole 172 is communicated with the through oil pipe 130 through a sleeve structure, and the inner diameter of each sleeve structure is greater than or equal to the diameter of the axial oil guiding hole 172. In this way, the sleeve structure can prevent the coolant from splashing, and further improves the utilization rate of the coolant.

[0123] In one example, as Figure 21 , Figure 22 , Figure 24 and Figure 25As shown, the outer diameter of a sleeve structure 175 is smaller than the inner diameter of the oil through-tube 130, and the oil through-tube 130 is used to accommodate part of a sleeve structure 175. In this way, almost all of the coolant flowing into the axial oil guiding hole 172 can flow into the oil through-tube 140, further reducing the leakage amount of the coolant and improving the utilization rate of the coolant.

[0124] Furthermore, in some embodiments, as Figure 24 and Figure 25 shown, there is a gap between a sleeve structure 175 and the oil through-tube 130 along the radial direction of the motor. In this way, when the input shaft of the reducer rotates at a high speed, it can avoid wear between the stationary oil guiding member 170 and the oil through-tube 130 rotating at a high speed, and reduce the failure risk of the oil guiding member 170 and the oil through-tube 130.

[0125] In one example, as Figure 15 、 Figure 16 、 Figure 18 and Figure 19 shown, the inner diameter of a sleeve structure 175 is larger than the inner diameter of the oil through-tube 130, and a sleeve structure 175 is used to accommodate part of the oil through-tube 130. Another sleeve structure 176 is used to be sleeved on a sleeve structure 175, and there is a gap between another sleeve structure 176 and the oil through-tube 130 along the axial direction of the motor. In this way, when the input shaft of the reducer rotates at a high speed, the coolant can flow into the axial oil guiding hole 172 along the radial groove 171 of the oil guiding member 170 and flow into the oil through-tube 130 in a non-contact manner, avoiding wear between the oil guiding member 170 and the oil through-tube 130, and reducing the failure risk of the oil guiding member 170 and the oil through-tube 130.

[0126] Furthermore, in some embodiments, as Figure 15 、 Figure 16 、 Figure 18 and Figure 19 shown, there are gaps between a sleeve structure 175, another sleeve structure 176 and the oil through-tube 130 along the radial direction of the motor respectively. In this way, when the input shaft of the reducer rotates at a high speed, it can avoid wear between the stationary oil guiding member 170 and the oil through-tube 130 rotating at a high speed, and reduce the failure risk of the oil guiding member 170 and the oil through-tube 130.

[0127] In some embodiments, the inner wall of the mounting hole 212 includes at least one set of protrusions, each set of protrusions includes at least one protrusion, and multiple sets of protrusions on the inner wall of the mounting hole 212 are arranged along the axial direction of the motor. In one example, multiple protrusions in each set of protrusions on the inner wall of the mounting hole 212 are arranged at intervals along the circumferential direction of the motor. In another example, multiple protrusions in each set of protrusions on the inner wall of the mounting hole 212 form an annular protrusion along the circumferential direction of the motor. For example, as Figure 5 and Figure 6As shown, a set of protrusions on the inner wall of the circumferential mounting hole 212 of the motor form an annular protrusion P3. As Figure 6 shown, another set of protrusions on the inner wall of the circumferential mounting hole 212 of the motor form an annular protrusion P4.

[0128] Among them, each protrusion in a set of protrusions on the inner wall of the mounting hole 212 includes two sides arranged back to back along the axial direction of the motor, and one of the two sides includes a groove G4. In one example, as Figure 6 shown, the groove G4 of each protrusion communicates with the side of each protrusion facing the oil guiding member 170. In one example, as Figure 5 shown, the groove G4 of each protrusion penetrates each protrusion along the axial direction of the motor. Its characteristic lies in that

[0129] In some embodiments, another set of protrusions on the inner wall of the mounting hole 212 form a shoulder along the axial direction of the motor, which can prevent the oil guiding member 170 from moving towards the side of the through oil pipe along the axial direction of the motor. For example, as Figure 6 shown, the size of each protrusion in a set of protrusions on the inner wall of the circumferential mounting hole 212 of the motor is equal to the size of the oil guiding member 170. Each protrusion in another set of protrusions on the inner wall of the circumferential mounting hole 212 of the motor is connected to one protrusion in a set of protrusions. Another set of protrusions is arranged on the side of a set of protrusions facing the through oil pipe 130 along the axial direction of the motor. The size of each protrusion in another set of protrusions is larger than the size of each protrusion in a set of protrusions along the radial direction of the motor. In this way, another set of protrusions on the inner wall of the mounting hole 212 forms a shoulder along the axial direction of the input shaft, which can prevent the oil guiding member from moving towards the side of the through oil pipe along the axial direction of the input shaft.

[0130] In some embodiments, the outer peripheral surface of the oil guiding member 170 includes at least one set of protrusions, each set of protrusions includes at least one protrusion, and a plurality of protrusions are arranged at intervals along the circumferential direction of the motor. The size of each protrusion along the axial direction of the motor is smaller than the size of the outer peripheral surface of the oil guiding member 170. As Figures 15 to 17 、 Figures 20 to 23 shown, each protrusion P5 of a set of protrusions on the outer peripheral surface of the oil guiding member 170 is used to be embedded in a groove G4 of one protrusion in a set of protrusions on the inner wall of the mounting hole 212. In this way, during the process of installing the oil guiding member 170 into the mounting hole 212, each protrusion on the outer peripheral surface of the oil guiding member 170 is embedded into the groove on the inner wall of the mounting hole 212. On the one hand, it can prevent the oil guiding member 170 from rotating along the axial direction of the motor. On the other hand, it can also avoid misinstalling the oil guiding member 170 so that the radial groove 171 on the oil guiding member 170 is not communicated with the radial through hole 211 on the reducer end cover 210. Furthermore, the functions of anti-rotation and anti-fooling are realized.

[0131] In some embodiments, the size of each groove G4 along the axial direction of the motor is equal to the size of each protrusion P5, and the size of each groove G4 along the circumferential direction of the motor is equal to the size of each protrusion P5.

[0132] In some embodiments, another group of protrusions on the outer peripheral surface of the oil guide member 170 form shoulders along the axial direction of the motor, which can prevent the oil guide member 170 from moving axially away from the oil pipe 130. For example, as Figures 15 to 19 shown, a plurality of protrusions of another group of protrusions on the outer peripheral surface of the oil guide member 170 communicate circumferentially along the input shaft to form an annular protrusion P6, and another group of protrusions on the outer peripheral surface along the axial direction of the motor are arranged on the side of a group of protrusions away from the oil pipe 130.

[0133] In some embodiments, along the axial direction of the motor, each protrusion P5 of a group of protrusions on the outer peripheral surface of the oil guide member 170 is connected to the annular protrusion P6 formed by a plurality of protrusions of another group of protrusions. In this way, the processing technology of the two groups of protrusions on the outer peripheral surface of the oil guide member 170 is simple.

[0134] In some embodiments, as Figures 21 to 23 shown, the oil guide member 170 further includes a through hole 173. The through hole 173 of the oil guide member 170 penetrates the oil guide member 170 along the axial direction of the motor. Along the axial direction of the motor, the projections of the through hole 173 of the oil guide member 170, the radial groove 171, and the axial oil guide hole 172 do not overlap. In this way, the coolant on the side of the oil guide member 170 away from the oil pipe 130 can flow into the side of the oil guide member 170 facing the oil pipe 130 along the through hole 173 of the oil guide member 170. Furthermore, it avoids the large pressure of the coolant on the side of the oil guide member 170 away from the oil pipe 130, so as to damage the oil guide member 170.

[0135] Furthermore, in some embodiments, since the coolant on the side of the oil guide member 170 away from the oil pipe 130 is relatively less, in order not to affect the structural strength of the oil guide member 170 itself, the diameter of the through hole 173 of the oil guide member 170 is not set too large, such as setting the diameter of the through hole 173 of the oil guide member 170 to be smaller than the diameter of the axial oil guide hole 172 of the oil guide member 170.

[0136] In some embodiments, in order to achieve the light weight of the oil guide member 170 and the oil-cooled power assembly 10, as Figures 15 to 25 shown, the end face of the oil guide member 170 away from the oil pipe 130 includes a plurality of weight-reducing grooves 174. The plurality of weight-reducing grooves 174 are arranged at intervals along the circumferential direction of the motor. Along the axial direction of the motor, the projections of each weight-reducing groove 174, the radial groove 171, and the axial oil guide hole 172 do not overlap.

[0137] In some embodiments, as Figure 2 and Figure 3As shown, the oil-cooled powertrain 10 further includes a plugging member 180. The plugging member 180 is used to be embedded in the mounting hole 212 to seal the mounting hole 212. Along the axial direction of the motor, the plugging members 180 are arranged on the side of the oil guiding member 170 away from the through oil pipe 130 to limit the movement of the oil guiding member 170 along the circumferential direction of the motor to the side away from the through oil pipe 130.

[0138] Further, in some embodiments, there is a gap between the plugging member 180 and the oil guiding member 170 along the axial direction of the motor. In this way, the coolant on the side of the oil guiding member 170 away from the through oil pipe 130 can be stored in the gap between the plugging member 180 and the oil guiding member 170. Furthermore, it avoids the large pressure of the coolant on the side of the oil guiding member 170 away from the through oil pipe 130, so as to prevent damage to the oil guiding member 170.

[0139] In some embodiments, the outer peripheral surface of the plugging member 180 has an external thread, and the inner wall of the mounting hole 212 of the reducer end cover 310 has an internal thread. In this way, through the cooperation of the external thread on the outer peripheral surface of the plugging member 180 and the internal thread on the inner wall of the mounting hole 212 of the reducer end cover 310, the plugging member 180 is hermetically fixed to the reducer end cover 310 to prevent the cooling oil from leaking out of the oil-cooled powertrain 10 through the mounting hole 212.

[0140] In other embodiments, the outer peripheral surface of the plugging member 180 includes an annular groove, and the annular groove on the outer peripheral surface of the plugging member 180 is used to embed a sealing ring. In this way, the plugging member 180 is hermetically fixed to the reducer end cover 310 through the sealing ring to prevent the cooling oil from leaking out of the oil-cooled powertrain 10 through the mounting hole 212.

[0141] The oil-cooled powertrain 10 further includes a motor controller 200, and the motor controller 200 is used to control the start or stop, forward or reverse rotation, speed increase or decrease, drive torque increase or decrease, braking torque increase or decrease, etc. of the motor 100.

[0142] Exemplarily, the through oil pipe 130, the support structure 150, the sealing structure 160, the cantilever column 140, or the oil guiding member 170 are made of materials such as nylon. In this way, the through oil pipe 130, the support structure 150, the sealing structure 160, the cantilever column 140, or the oil guiding member 170 not only have a certain toughness, but also are light in weight, low in cost, and convenient for mass production and mold opening.

[0143] Exemplarily, the plugging member 180 is made of a metal material. In this way, it is beneficial to improve the rigidity of the plugging member 180 and ensure that the cooling oil does not leak out of the oil-cooled powertrain 10 through the mounting hole 212.

[0144] Exemplarily, the types of coolant involved in the embodiments of the present application include, but are not limited to, ethylene glycol-based cooling oils, synthetic oils, mineral oils, and the like.

[0145] It should be noted that Figures 15 to 25 Taking the outer shape of the oil guide member 170 as a circle as an example, it should not constitute a limitation to the present application. For example, the outer shape of the oil guide member 170 can also be square, oval, etc. In addition, Figures 2 to 6 , Figures 18 to 20 , Figure 23 and Figure 24 The outer shape of the reducer end cover 210 shown is only an example and should not constitute a limitation to the present application.

[0146] As mentioned above, the above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An oil-cooled powertrain, characterized in that, The oil-cooled powertrain includes: a speed reducer and a motor, the motor shaft of the motor is used for drivingly connecting the input shaft of the speed reducer, and the shaft cavity of the input shaft along the axial direction of the motor penetrates through the input shaft; a through oil pipe, the through oil pipe is used for communicating the shaft cavity of the motor shaft through the shaft cavity of the input shaft; a plurality of cantilever columns, one end of each cantilever column is used for being fixed on the outer peripheral surface of the through oil pipe, the other ends of the plurality of cantilever columns are arranged at intervals along the circumferential direction of the motor, and the other end of each cantilever column is spaced from the outer peripheral surface of the through oil pipe along the radial direction of the motor, and the distance between the other end of each cantilever column and the central axis of the through oil pipe along the radial direction of the motor is greater than or equal to the radius of the shaft cavity of the input shaft.

2. The oil-cooled power assembly according to claim 1, wherein The shaft cavity of the input shaft is used for accommodating the through oil pipe, the inner peripheral surface of the shaft cavity of the input shaft includes a plurality of grooves, each groove is used for accommodating the other end of at least one cantilever column, and the distance between each groove and the opening of the shaft cavity of the input shaft facing the motor along the axial direction of the motor is less than the length of the through oil pipe.

3. The oil-cooled power assembly according to claim 2, wherein The plurality of grooves communicate with each other along the circumferential direction of the motor to form an annular groove, the annular groove includes a groove bottom and two groove walls arranged oppositely along the axial direction of the motor, the groove bottom is respectively used for connecting the two groove walls, and the distance between the two groove walls gradually decreases along the radial direction of the motor away from the central axis of the through oil pipe.

4. The oil-cooled power assembly according to any one of claims 1 to 3, characterized in that, The shaft cavity of the input shaft includes two input shaft cavities communicating with each other along the axial direction of the motor, and the size of one input shaft cavity is larger than that of the other input shaft cavity along the radial direction of the motor, wherein: one input shaft cavity is used for accommodating the through oil pipe, and the other input shaft cavity is used for accommodating at least a part of the motor shaft.

5. The oil-cooled power assembly according to any one of claims 1 to 4, characterized in that, The oil-cooled powertrain further includes a support structure, one end of each cantilever column is fixed on the outer peripheral surface of the through oil pipe through the support structure, the outer peripheral surface of the support structure includes a plurality of protrusions, the plurality of protrusions are arranged at intervals along the circumferential direction of the motor, and the distance between each protrusion and the central axis of the through oil pipe along the radial direction of the motor is greater than or equal to the radius of the shaft cavity of the input shaft.

6. The oil-cooled power assembly according to claim 5, characterized in that, The size of each protrusion along the axial direction of the motor is larger than the size of each protrusion along the radial direction of the motor.

7. The oil-cooled power assembly according to any one of claims 1 to 6, characterized in that, The oil-cooled powertrain further includes at least one weight-reducing groove, the size of each weight-reducing groove along the axial direction of the motor is smaller than the size of the cantilever column or the support structure, and the plurality of weight-reducing grooves are arranged at intervals along the circumferential direction of the motor.

8. The oil-cooled powertrain according to any one of claims 5 to 7, characterized in that, The size of each cantilever column along the axial direction of the motor is greater than or equal to that of the support structure; The distance between the support structure and one end of the through oil pipe along the axial direction of the motor is less than the distance between the support structure and the other end of the through oil pipe.

9. The oil-cooled power assembly according to any one of claims 1 to 8, characterized in that, The side surface of the other end of each cantilever column facing away from the through oil pipe includes a protrusion, each protrusion is used for being embedded in the shaft cavity of the input shaft, and the size of each protrusion along the radial direction of the motor away from the central axis of the through oil pipe first increases and then decreases along the axial direction of the motor.

10. The oil-cooled power assembly according to any one of claims 1 to 9, characterized in that, There is a gap between one ends of two adjacent cantilever columns arranged along the circumferential direction of the motor.

11. The oil-cooled power assembly according to any one of claims 1 to 10, characterized in that, The oil delivery pipe and the motor shaft are arranged along the axial direction of the motor. The shaft cavity of the motor shaft includes two motor shaft cavities that communicate with each other along the axial direction of the motor. In the radial direction of the motor, the size of one motor shaft cavity is larger than that of the other motor shaft cavity, where: In the axial direction of the motor, one motor shaft cavity is used to accommodate a part of the oil delivery pipe.

12. The oil-cooled power assembly according to claim 11, characterized in that, There is a gap between the outer peripheral surface of the oil delivery pipe and the one motor shaft cavity in the radial direction of the motor, and there is a gap between the oil delivery pipe and the other motor shaft cavity in the axial direction of the motor.

13. The oil-cooled power assembly according to any one of claims 1 to 12, characterized in that, The oil-cooled power assembly further includes a sealing structure. The oil delivery pipe is used to be fixedly sealed with the inner wall of the shaft cavity of the input shaft through the sealing structure; In the radial direction of the motor, the oil delivery pipe, the sealing structure, and the input shaft are arranged in sequence; In the axial direction of the motor, the cantilever column, the sealing structure, and the motor shaft are arranged at intervals in sequence.

14. The oil-cooled powertrain according to claim 13, characterized in that, In the axial direction of the motor, one end of the oil delivery pipe is arranged on the side away from the motor shaft of the other end of the oil delivery pipe, where: In the axial direction of the motor, the distance between the sealing structure and one end of the oil delivery pipe is greater than the distance between the sealing structure and the other end of the oil delivery pipe; In the axial direction of the motor, the distance between the sealing structure and the other end of the oil delivery pipe is equal to the distance between the other end of the cantilever column and one end of the oil delivery pipe; In the axial direction of the motor, the distances between the sealing structure and the support structure are respectively greater than the distance between the sealing structure and the other end of the oil delivery pipe and the distance between the support structure and one end of the oil delivery pipe.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels, a transmission mechanism, and the oil-cooled power assembly according to any one of claims 1 to 14. The oil-cooled power assembly drives the wheels through the transmission mechanism.

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