Power assembly and electric vehicle

Abstract

The invention provides a power assembly and an electric vehicle. A shell of the power assembly comprises a speed reducer groove, a speed reducer end cover, a motor groove and an electric control groove. The reducer groove is used for containing an input shaft, an intermediate shaft and an output shaft of the reducer. A notch of the speed reducer groove and a notch of the motor groove are opposite in the axial direction of the driving motor, and the electric control groove is stacked on the speed reducer groove and the motor groove. The first internal flow channel is used for receiving oil output by the oil pump. The groove bottom of the speed reducer groove comprises a first oil outlet hole, and the first oil outlet hole is used for conveying oil in the first internal flow channel through the first nozzle to actively lubricate a bearing of the intermediate shaft and a bearing of the output shaft. The first oil outlet holes are distributed between the middle shaft and the output shaft and are close to the electric control groove relative to the middle shaft and the output shaft in the stacking direction of the electric control groove and the speed reducer groove. The first oil outlet hole is used for giving consideration to active lubrication of the bearing of the intermediate shaft and the bearing of the output shaft, and the lubrication efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a powertrain and an electric vehicle. Background Art

[0002] The powertrain is the main power source for electric vehicles. The drive motor of the powertrain can convert the electrical energy delivered by the power battery into mechanical energy, and the reducer of the powertrain can convert the high-speed kinetic energy into greater torque output to meet the needs of the vehicle during driving.

[0003] With the continuous development of the new energy vehicle industry, the power density requirements for powertrains are getting higher and higher, making the lubrication of powertrains face greater challenges. If the powertrain has insufficient lubrication, it will shorten the service life of the powertrain and have a negative impact on the normal driving of electric vehicles. Summary of the invention

[0004] Embodiments of the present application provide a powertrain and an electric vehicle with an active bearing lubrication function.

[0005] In a first aspect, an embodiment of the present application provides a powertrain, wherein the housing of the powertrain includes a reducer slot, a reducer end cover, a motor slot, and an electric control slot. The reducer end cover is used to enclose the notch of the reducer slot, and the reducer slot is used to accommodate the input shaft, intermediate shaft, and output shaft of the reducer in the powertrain. The intermediate shaft is used to drive and connect the input shaft and the output shaft. The notch of the reducer slot and the notch of the motor slot are opposite to each other along the axial direction of the drive motor in the powertrain, and the electric control slot is stacked on the reducer slot and the motor slot.

[0006] The internal flow channel of the housing includes a first internal flow channel, and the first internal flow channel is used to receive the oil output by the oil pump of the power assembly. The groove bottom of the reducer groove includes a first oil outlet hole, and the first oil outlet hole is used to transmit the oil in the first internal flow channel through the first nozzle to actively lubricate a bearing of the intermediate shaft and a bearing of the output shaft. The first oil outlet hole is distributed between the intermediate shaft and the output shaft, and the first oil outlet hole is close to the electric control groove relative to the intermediate shaft and the output shaft along the stacking direction of the electric control groove and the reducer groove.

[0007] In the embodiment of the present application, the intermediate shaft is used to transmit power from the input shaft to the output shaft. One bearing of the output shaft and one bearing of the intermediate shaft rotate with the output shaft and the intermediate shaft respectively, and it is necessary to ensure that one bearing of the output shaft and one bearing of the intermediate shaft are adequately lubricated to extend the service life of the reducer and improve the safety performance of the powertrain.

[0008] However, the current lubrication method for reducer bearings is usually passive lubrication: by collecting the oil thrown out by the gears and other rotating parts of the reducer, or collecting the oil leaked from certain structures, and then guiding the collected oil to the reducer bearings. This passive lubrication method is limited by the speed of the rotating parts and the temperature of the oil. If the speed of the rotating parts is too low, the oil will lack sufficient power during the transmission process, and if the temperature of the oil is too low, the oil viscosity will be high. Both of the above factors will have a negative impact on the collection of the oil, which is not conducive to improving the lubrication efficiency.

[0009] In the embodiment of the present application, in order to avoid the defects caused by only passive lubrication of the bearings of the reducer, the embodiment of the present application uses an oil pump to actively deliver oil to the bearings of the reducer. Driven by the oil pump, the flow of the oil is not easily affected by the rotation speed of the rotating parts and the oil temperature, so that one bearing of the output shaft and one bearing of the intermediate shaft can be stably lubricated.

[0010] Among them, active lubrication involves the problem of oil delivery. The embodiment of the present application utilizes the first internal flow channel to receive the oil from the oil pump. The first internal flow channel is the internal flow channel of the shell, which is integrally formed with the shell and has strong structural stability. The first internal flow channel is located inside the shell and can also avoid interference from the drive motor or reducer, which is conducive to ensuring that the first internal flow channel stably delivers oil. In addition, the first internal flow channel does not occupy the accommodation space of the shell of the powertrain, which is conducive to realizing the miniaturized design of the powertrain.

[0011] In an embodiment of the present application, the first oil outlet is used to transmit the oil of the first internal flow channel through the first nozzle. By using the first nozzle to transmit the oil, the position layout of the first oil outlet can be adjusted according to the actual lubrication needs, which is beneficial to expand the coverage of the oil in the reducer groove. In an embodiment of the present application, the first oil outlet is arranged between the output shaft and the intermediate shaft, which can take into account the active lubrication of one bearing of the output shaft and one bearing of the intermediate shaft, improve the lubrication efficiency, and also help to reduce the number of oil outlets of the powertrain housing, and reduce the risk of damage to the structural strength of the powertrain housing. The first oil outlet uses a nozzle to transmit the oil, so that the opening direction of the first oil outlet does not have to point directly to a bearing of the output shaft and a bearing of the intermediate shaft, which is beneficial to reduce the processing difficulty and cost of the first oil outlet.

[0012] In the embodiment of the present application, the groove bottom of the reducer groove is adjacent to the groove bottom of the motor groove along the axial direction of the drive motor. It can be understood that the structural strength and vibration resistance of the reducer groove are generally better than the reducer end cover. Compared with the first oil outlet hole distributed in the reducer end cover, the embodiment of the present application arranges the first oil outlet hole at the groove bottom of the reducer groove, which can enhance the stability of the first oil outlet hole transmitting oil to the first nozzle and reduce the interference to the first nozzle.

[0013] In an embodiment of the present application, along the stacking direction of the electric control slot and the reducer slot, the distance between the first oil outlet and the electric control slot is smaller than the distance between the intermediate shaft, the output shaft and the electric control slot. The first oil outlet is close to the electric control slot relative to the intermediate shaft and the output shaft, which facilitates the movement of the oil with the help of gravity after being sprayed from the first nozzle, which is beneficial to reduce the power loss of the oil in the transmission path. If the first oil outlet is far away from the electric control slot relative to the output shaft and the intermediate shaft, the oil sprayed from the first nozzle will also need to resist the effect of gravity, which may result in the oil not having enough power to move to a bearing of the output shaft and a bearing of the intermediate shaft, which is not conducive to improving the lubrication efficiency of a bearing of the output shaft and a bearing of the intermediate shaft.

[0014] In one embodiment, the first internal flow channel is distributed inside the groove bottom of the reducer groove, and the extension direction of the first internal flow channel intersects with the opening direction of the first oil outlet hole.

[0015] In an embodiment of the present application, the first internal flow channel is distributed inside the groove bottom of the reducer groove, which is conducive to enhancing the structural stability of the first internal flow channel. The first internal flow channel and the first oil outlet hole are both distributed at the groove bottom of the reducer groove, which facilitates the direct connection between the first internal flow channel and the first oil outlet hole, reducing the difficulty of oil flowing from the first internal flow channel to the first oil outlet hole. In an embodiment of the present application, the extension direction of the first internal flow channel intersects with the opening direction of the first oil outlet hole, and the first oil outlet hole can change the flow direction of the oil, so that the path of the first internal flow channel does not have to directly point to a bearing of the output shaft and a bearing of the intermediate shaft.

[0016] In one embodiment, the oil pump of the power assembly is distributed on a side of the intermediate shaft and the output shaft away from the electronic control tank, and the first internal flow channel is distributed between the intermediate shaft and the output shaft.

[0017] In the embodiment of the present application, the first internal flow channel and the oil pump are arranged compactly, which facilitates the first internal flow channel to connect to the oil pump, shortens the length of the first internal flow channel, reduces the power loss of the oil transmitted in the first internal flow channel, and improves the lubrication efficiency of a bearing of the output shaft and a bearing of the intermediate shaft. The first internal flow channel and the first oil outlet are both distributed between the intermediate shaft and the output shaft, which is conducive to shortening the transmission path of the oil. In addition, the embodiment of the present application reuses the space between the intermediate shaft and the output shaft, which is convenient for controlling the volume of the powertrain.

[0018] In one embodiment, the groove bottom of the reducer groove includes a first output bearing groove, and the first output bearing groove is used to accommodate a bearing of the output shaft.

[0019] The first oil outlet is distributed between the intermediate shaft and the first output bearing groove. The first oil injection port of the first nozzle is used to transmit oil to the notch of the groove wall of the first output bearing groove, and the notch of the groove wall of the first output bearing groove is distributed between the first oil outlet and the output shaft.

[0020] In the embodiment of the present application, the first oil injection port of the first nozzle is used to spray oil to the notch of the groove wall of the first output bearing groove, and the oil flows into the first output bearing groove from the notch of the groove wall of the first output bearing groove to actively lubricate a bearing of the output shaft. Lubricating a bearing of the output shaft by spraying oil from a nozzle can reduce the number of internal flow channels of the housing, and reduce the processing difficulty and cost of the housing of the powertrain.

[0021] In the embodiment of the present application, the distance between the notch in the groove wall of the first output bearing groove and the first oil outlet hole is smaller than the distance between the output shaft and the first oil outlet hole, and the notch in the groove wall of the first output bearing groove is distributed on the side of the output shaft close to the first oil outlet hole, which is beneficial to shorten the path of the oil moving from the first nozzle to the first output bearing groove, thereby enhancing the lubrication effect on a bearing of the output shaft.

[0022] In one embodiment, the first output bearing groove is recessed relative to the groove bottom of the motor groove away from the reducer end cover along the axial direction of the output shaft. The first oil guide rib at the groove bottom of the reducer groove extends from the motor groove toward the notch of the groove wall of the first output bearing groove. Along the stacking direction of the electric control groove and the reducer groove, the first oil guide rib is distributed on the side of the notch of the groove wall of the first output bearing groove away from the first oil outlet.

[0023] In the embodiment of the present application, the bottom of the first output bearing groove is recessed along the axial direction of the output shaft away from the motor groove, which is equivalent to the first output bearing groove utilizing the space on the outer peripheral side of the motor groove. It can expand the accommodating space of the reducer groove without increasing the axial length of the powertrain, which is conducive to optimizing the layout of the reducer.

[0024] In the embodiment of the present application, when the first output bearing groove is recessed away from the reducer end cover, the oil sprayed from the first oil injection port of the first nozzle is easy to leak at the gap of the first output bearing groove. In order to improve the lubrication efficiency, in the embodiment of the present application, the groove bottom of the reducer groove includes a first oil guide rib, which is distributed on the side of the gap of the first output bearing groove away from the first oil outlet, and the first oil guide rib points from the motor groove to the gap of the first output bearing groove. The oil leaked from the gap of the first output bearing groove can continue to flow into the gap of the first output bearing groove under the guidance of the first oil guide rib, reducing the loss of oil.

[0025] In one embodiment, the first oil guide rib is used to form an oil collecting groove with the groove wall of the first output bearing groove, and the concave direction of the oil collecting groove along the axial direction of the output shaft is away from the reducer end cover. The groove depth of the oil collecting groove along the axial direction of the output shaft is less than the groove depth of the first output bearing groove, and the notch of the groove wall of the first output bearing groove faces the oil collecting groove.

[0026] In the embodiment of the present application, when the oil sprayed by the first nozzle splashes at the notch of the groove wall of the first output bearing groove, if the groove wall of the first output bearing groove cannot play the role of blocking the oil, it will cause some oil to be difficult to flow into the first output bearing groove. In the embodiment of the present application, the groove wall of the first output bearing groove cooperates with the first oil guide rib to form an oil collecting groove, and the oil collecting groove can block the splashing oil and guide it to the notch of the groove wall of the first output bearing groove, which is conducive to reducing the loss of oil. In the embodiment of the present application, the groove depth of the oil collecting groove is less than the groove depth of the first output bearing groove, which is conducive to avoiding the accumulation of oil in the oil collecting groove and accelerating the flow of oil.

[0027] In one embodiment, the groove bottom of the reducer groove includes a first intermediate bearing groove, and the first intermediate bearing groove is used to accommodate a bearing of the intermediate shaft. The first intermediate bearing groove protrudes toward the reducer end cover relative to the first oil outlet hole along the axial direction of the intermediate shaft, and the first intermediate bearing groove is away from the first oil outlet hole relative to the output shaft.

[0028] The first oil injection port of the first nozzle is used to transmit oil to the second oil guide rib at the bottom of the reducer groove. The second oil guide rib is from the electric control groove toward the notch of the groove wall of the first intermediate bearing groove, and the notch of the groove wall of the first intermediate bearing groove is toward the electric control groove and away from the intermediate shaft.

[0029] In the embodiment of the present application, the first oil outlet hole delivers oil to the notch of the first output bearing groove and the notch of the first intermediate bearing groove respectively through the first nozzle.

[0030] In the embodiment of the present application, the distance between the intermediate bearing groove and the first oil outlet is relatively far. If the first oil injection port of the first nozzle directly sprays oil to the notch of the first intermediate bearing groove, the length of the first nozzle needs to be extended. In addition, the first intermediate bearing groove protrudes toward the reducer end cover relative to the first oil outlet, so that the groove wall of the first intermediate bearing groove will block the oil sprayed from the first oil injection port of the first nozzle. In order to reduce the space occupied by the first nozzle and enhance the effect of oil lubricating a bearing of the intermediate shaft, in the embodiment of the present application, the groove bottom of the reducer groove also includes a second oil guide rib, which is distributed between the electric control groove and the notch of the first intermediate bearing groove. The second oil guide rib can be used as an intermediate structure for transmitting oil between the first nozzle and the notch of the first intermediate bearing groove. The second oil guide rib is used to receive the oil sprayed from the first oil injection port of the first nozzle, and to transmit oil to the notch of the first intermediate bearing groove, so that the first oil outlet and the first nozzle can adapt to the application scenario where the first intermediate bearing groove is placed below.

[0031] In one embodiment, the inner diameter of the notch of the groove wall of the first intermediate bearing groove increases along the intermediate shaft in a direction toward the second oil guiding rib.

[0032] In the embodiment of the present application, the notch of the first intermediate bearing groove is from the intermediate shaft toward the second oil guide rib, and the notch of the first intermediate bearing groove is used to receive the oil delivered by the first nozzle to the second oil guide rib, and to transmit the oil to the first intermediate bearing groove. The inner diameter of the notch of the first intermediate bearing groove at one end close to the second oil guide rib is relatively large, and the oil guided by the second oil guide rib is easier to flow into the notch of the first intermediate bearing groove, which can improve the efficiency of the notch of the first intermediate bearing groove in receiving the oil and reduce the oil loss. The inner diameter of the notch of the first intermediate bearing groove at the other end close to the intermediate shaft is relatively small, so that the inner wall of the notch of the first intermediate bearing groove can play a role in gathering and guiding the oil, which helps to reduce the flow resistance of the oil.

[0033] In one embodiment, the intermediate driving wheel of the reducer and the intermediate driven wheel of the reducer are fixed to the intermediate shaft. The first oil outlet hole, the first intermediate bearing groove and the second oil guide rib are distributed on the side of the intermediate driving wheel away from the intermediate driven wheel along the axial direction of the intermediate shaft, and the outer diameter of the intermediate driving wheel is smaller than the outer diameter of the intermediate driven wheel.

[0034] The second oil guide rib along the axial direction of the intermediate shaft protrudes toward the intermediate driving wheel relative to the first intermediate bearing groove, and the intermediate driving wheel along the radial direction of the intermediate shaft is distributed between the second oil guide rib and the intermediate shaft. The distance between the second oil guide rib and the intermediate driving wheel along the radial direction of the intermediate shaft is smaller than the distance between the center of the first oil outlet hole and the intermediate driving wheel.

[0035] In the embodiment of the present application, one surface of the intermediate driving wheel along the axial direction of the intermediate shaft faces the groove bottom of the reducer groove, and the other surface of the intermediate driving wheel along the axial direction of the intermediate shaft faces the intermediate driven wheel. The intermediate driven wheel is used to mesh with the input wheel, and the intermediate driving wheel is used to mesh with the output wheel. The outer diameter of the intermediate driving wheel is smaller than the outer diameter of the intermediate driven wheel, so that the reducer can play the role of reducing speed and increasing torque.

[0036] In the embodiment of the present application, in addition to being used to lubricate a bearing of the intermediate shaft, the second oil guide rib can also actively lubricate the intermediate driven wheel and the intermediate shaft, thereby realizing the reuse of the second oil guide rib. Specifically, the axial distance between the second oil guide rib and the other surface of the intermediate driving wheel is smaller than the axial distance between the groove wall of the first intermediate bearing groove and the other surface of the intermediate driving wheel, which is equivalent to the second oil guide rib extending to one side of the intermediate driving wheel along the radial direction of the intermediate shaft. The second oil guide rib can transmit the oil in the first internal flow channel to the intermediate driving wheel and the intermediate shaft, and the intermediate shaft can continue to throw the oil to the first intermediate bearing groove. While the second oil guide rib can lubricate a bearing of the intermediate shaft, it can also lubricate the intermediate driving wheel, which is beneficial to reduce the wear of the intermediate driving wheel and the output wheel.

[0037] In the embodiment of the present application, the outer diameter of the intermediate driving wheel is relatively small, and the distance between the second oil guide rib and the intermediate driving wheel is smaller than the distance between the first oil outlet hole and the intermediate driving wheel. Compared with directly spraying oil to the intermediate driving wheel through the first nozzle, the embodiment of the present application lubricates the intermediate driving wheel with the help of the second oil guide rib, which can avoid extending the length of the first nozzle.

[0038] In one embodiment, the differential of the reducer is arranged between the first output bearing groove and the end cover of the reducer. The output wheel of the reducer is used to drive the differential housing of the differential, and the differential housing is used to accommodate the planetary shafts and differential gear sets of the differential, and the planetary shafts are used to drive the differential gear sets. The differential housing includes a window, the window passes through the differential housing, and the planetary shafts are exposed to the window of the differential housing. The windows of the differential housing are distributed between the output shaft and the first oil outlet. The first oil injection port of the first nozzle is used to transmit oil to the window of the differential housing.

[0039] In the embodiment of the present application, the distance between the window of the differential case and the first oil outlet hole is smaller than the distance between the output shaft and the first oil outlet hole, and the window of the differential case is distributed on the side of the output shaft close to the first oil outlet hole, which helps to shorten the path of the oil moving from the first nozzle to the window of the differential case, thereby enhancing the lubrication effect on the differential.

[0040] In the embodiment of the present application, the planetary shaft is used as an intermediate medium for lubricating the differential gear set. By directing the oil to the planetary shaft and expanding the coverage of the oil with the help of the rotation of the planetary shaft, it is beneficial to realize the redistribution of the oil in the differential housing.

[0041] In one embodiment, the internal flow channel of the housing includes a second internal flow channel, and the second internal flow channel is distributed inside the groove wall of at least one of the reducer groove or the motor groove. The inlet of the second internal flow channel is used to receive the oil of the first internal flow channel through the heat exchanger of the powertrain. The outlet of the second internal flow channel is used to transmit the oil of the first internal flow channel to actively lubricate one bearing of the input shaft and another bearing of the input shaft.

[0042] The groove bottom of the reducer groove includes a second oil outlet hole, and the second oil outlet hole is used to transmit the oil in the first internal flow channel through the second nozzle to actively lubricate another bearing of the intermediate shaft and another bearing of the output shaft.

[0043] In the embodiment of the present application, for the convenience of description, one bearing of the input shaft is recorded as bearing c, the other bearing of the input shaft is recorded as bearing d, the other bearing of the intermediate shaft is recorded as bearing e, and the other bearing of the output shaft is recorded as bearing f.

[0044] In the embodiment of the present application, the position of the second internal flow channel inside the housing is different from that of the first internal flow channel. The second internal flow channel is distributed inside the groove wall of at least one of the reducer groove or the motor groove, and the second internal flow channel is connected to the first internal flow channel, and the coverage of the oil in the powertrain can be expanded with the help of the second internal flow channel. The heat exchanger is used to cool the oil transmitted from the first internal flow channel to the second internal flow channel, so that the oil in the second internal flow channel can lubricate and cool the components of the powertrain.

[0045] In an embodiment of the present application, the second oil outlet is used to transmit the oil of the first internal flow channel through the second nozzle. By using the second nozzle to transmit the oil, the position layout of the second oil outlet can be adjusted according to the actual lubrication needs, which is beneficial to expand the coverage of the oil in the powertrain. The second oil outlet adopts a nozzle to transmit the oil, so that the opening direction of the second oil outlet does not have to point directly to the other bearing of the intermediate shaft and the other bearing of the output shaft, which is beneficial to reduce the processing difficulty and cost of the first oil outlet. Compared with the second oil outlet distributed on the reducer end cover, the embodiment of the present application arranges the second oil outlet at the bottom of the reducer groove, which can enhance the stability of the second oil outlet to transmit the oil to the second nozzle and reduce the interference of the second nozzle.

[0046] In the embodiment of the present application, the first internal flow channel and the second oil outlet hole are both distributed at the bottom of the reducer groove, so as to facilitate direct connection between the first internal flow channel and the second oil outlet hole, thereby reducing the difficulty of oil flowing from the first internal flow channel to the second oil outlet hole.

[0047] In the embodiment of the present application, active lubrication of the bearings of the input shaft, the intermediate shaft and the output shaft is achieved through the cooperation of the first internal flow channel, the second internal flow channel, the first oil outlet hole and the second oil outlet hole, which is beneficial to reduce the risk of insufficient local lubrication of the reducer.

[0048] In one embodiment, the groove bottom of the reducer groove includes a first input bearing groove, which is used to accommodate a bearing of the input shaft. The first input bearing groove is recessed toward the motor groove along the axial direction of the input shaft so that the groove bottom of the motor groove forms an annular protrusion.

[0049] The second internal flow channel is used to transmit oil to the oil holes of the first input bearing groove, and the oil holes of the first input bearing groove are distributed on the inner surface of the groove wall of the first input bearing groove. The opening direction of the oil holes of the first input bearing groove along the radial direction of the input shaft faces the axis of the first input bearing groove.

[0050] In the embodiment of the present application, the input shaft of the reducer is used for transmission connection with the motor shaft of the driving motor, the axial direction of the input shaft is parallel to the axial direction of the driving motor, the bottom of the first input bearing groove along the axial direction of the input shaft is opposite to the bottom of the motor groove, and the first input bearing groove is recessed toward the motor groove along the axial direction of the input shaft. In this case, in order to facilitate the second internal flow channel to communicate with the oil hole of the first input bearing groove, at least part of the second internal flow channel is distributed on the groove wall of the motor groove.

[0051] In the embodiment of the present application, since the oil of the first input bearing groove comes from the second internal flow channel instead of the nozzle, the first input bearing groove is different from the first intermediate bearing groove and the first output bearing groove in that the oil is transported by the oil holes distributed on the inner surface of the groove wall, and the opening direction of the oil holes of the first input bearing groove is radially toward the axis of the first input bearing groove along the input shaft. A radial flow channel can be used to connect the oil holes of the second internal flow channel and the first input bearing groove, or the oil holes of the first input bearing groove can be directly connected to the second internal flow channel.

[0052] In the embodiment of the present application, the first input bearing groove is recessed toward the motor groove, which is equivalent to borrowing part of the space in the motor groove to form the first input bearing groove, which is beneficial to reducing the axial length of the powertrain while lubricating one bearing of the input shaft.

[0053] In one embodiment, the reducer end cover includes a second input bearing groove, a fixing hole and an oil guide protrusion, the second input bearing groove is used to accommodate another bearing of the input shaft, and the fixing hole is used to fix the sealing member.

[0054] The second input bearing groove is recessed away from the reducer groove along the axial direction of the input shaft. The fixing hole passes through the bottom of the second input bearing groove. The oil guide protrusion is distributed on the surface of the reducer end cover away from the reducer groove.

[0055] The internal flow channel of the housing includes a third internal flow channel, and the third internal flow channel is distributed inside the oil guide protrusion. The third internal flow channel is used to transmit the oil in the second internal flow channel to the oil through hole of the second input bearing groove and the oil through hole of the fixing hole. The oil through hole of the fixing hole is distributed on the inner surface of the fixing hole, and is arranged in sequence along the axial plugging member of the input shaft, the oil through hole of the fixing hole, and the shaft cavity of the input shaft. The oil through hole of the second input bearing groove is distributed at the groove bottom of the second input bearing groove.

[0056] In the embodiment of the present application, the second input bearing groove and the fixing hole are both distributed on the reducer end cover, the second input bearing groove is used to accommodate another bearing of the input shaft, and the fixing hole is used to fix the plugging member. In order to realize active lubrication of the other bearing of the input shaft and the input shaft, a third internal flow channel can be arranged on the reducer end cover to guide the oil in the second internal flow channel to the oil hole of the second input bearing groove and the oil hole of the fixing hole. Specifically, the second input bearing groove is recessed away from the reducer groove, so that the outer peripheral side of the second input bearing groove has space for arranging the oil guide protrusion, and the third internal flow channel is distributed inside the oil guide protrusion. In order to ensure that the third internal flow channel can take into account the lubrication of the input shaft and the other bearing of the input shaft, the oil hole of the second input bearing groove needs to be distributed at the bottom of the second input bearing groove, and the oil hole of the second input bearing groove and the oil hole of the fixing hole form parallel branches. If the oil holes of the second input bearing groove are distributed on the inner surface of the groove wall of the second input bearing groove, since the distance between the groove wall of the second input bearing groove and the third internal flow channel is smaller than the distance between the fixed hole and the third internal flow channel, the oil in the third internal flow channel will need to first flow into the second input bearing groove to lubricate the other bearing of the input shaft, and then flow to the input shaft through the fixed hole, which is not conducive to improving the lubrication efficiency.

[0057] In the embodiment of the present application, part of the oil in the third internal flow channel can flow into the shaft cavity of the input shaft through the oil hole of the fixed hole. In one embodiment, the oil flowing into the shaft cavity of the input shaft can continue to flow to the shaft cavity of the motor shaft, which is conducive to lubricating the mating part of the input shaft and the motor shaft and cooling the motor shaft. The opening direction of the fixed hole is away from the bottom of the second input bearing groove, and the plugging parts are distributed in the fixed hole, which can prevent the oil flowing out of the oil hole of the fixed hole from leaking.

[0058] In one embodiment, the reducer end cover includes a second intermediate bearing groove, which is used to accommodate another bearing of the intermediate shaft. The second intermediate bearing groove protrudes toward the intermediate driven wheel of the reducer along the axial direction of the intermediate shaft, and the outer diameter of the intermediate driven wheel is larger than the outer diameter of the second intermediate bearing groove.

[0059] The two third oil guide ribs of the reducer end cover along the circumference of the intermediate shaft are distributed on both sides of the notch of the groove wall of the second intermediate bearing groove. The second oil outlet hole is distributed between the electronic control groove and the intermediate driven wheel, and the second oil outlet hole is used to transmit oil to the gap between the two third oil guide ribs through the second oil injection port of the second nozzle.

[0060] In the embodiment of the present application, one surface of the intermediate driven wheel along the axial direction of the intermediate shaft faces the reducer end cover, and the other surface of the intermediate driven wheel along the axial direction of the intermediate shaft faces the bottom of the reducer groove. The second intermediate bearing groove is distributed on the reducer end cover, and the second oil outlet is distributed on the bottom of the reducer groove, which is equivalent to the intermediate driven wheel being arranged between the second intermediate bearing groove and the second oil outlet. Among them, the outer diameter of the intermediate driven wheel is larger than the outer diameter of the second intermediate bearing groove. If the second oil outlet directly delivers oil to the gap of the second intermediate bearing groove through the second nozzle, the oil may be blocked by the intermediate driven wheel.

[0061] In this case, the embodiment of the present application arranges two third oil guide ribs on both sides of the notch of the groove wall of the second intermediate bearing groove, and the second oil injection port of the second nozzle sprays oil to the gap between the two third oil guide ribs. The two third oil guide ribs can guide the oil to the notch of the groove wall of the second intermediate bearing groove, which can effectively prevent the oil from being blocked by the intermediate driven wheel and improve the lubrication efficiency of the other bearing of the intermediate shaft. In order to realize the transmission of oil from the second nozzle to the gap between the two third oil guide ribs, the second oil outlet needs to be arranged between the electric control groove and the intermediate driven wheel along the stacking direction of the electric control groove and the reducer groove.

[0062] In the embodiment of the present application, the second intermediate bearing groove protrudes from the reducer end cover toward the intermediate driven wheel, and the two third oil guide ribs actually utilize the space on the outer peripheral side of the second intermediate bearing groove, which can effectively control the axial space occupied by the second intermediate bearing groove and the two third oil guide ribs, and is conducive to the miniaturization design of the reducer and powertrain.

[0063] In one embodiment, the reducer end cover includes a second output bearing groove, and the second output bearing groove is used to accommodate another bearing of the output shaft. The second oil outlet hole is used to transmit oil to the oil through hole of the groove wall of the second output bearing groove through the second oil injection port of the second nozzle. A third oil guide rib is arranged on the side of the notch of the groove wall of the second intermediate bearing groove facing the output shaft. The oil through holes of the groove wall of the second output bearing groove are distributed between the output shaft and a third oil guide rib.

[0064] In the embodiment of the present application, the active lubrication of another bearing of the output shaft and another bearing of the intermediate shaft shares the second oil outlet hole. When the second oil outlet hole delivers oil to one third oil guide rib and another third oil guide rib through the second oil injection port of the second nozzle, in order to reduce the difficulty of the second oil injection port of the second nozzle delivering oil to the oil through hole of the second output bearing groove, the oil through hole of the second output bearing groove should be adjacent to one third oil guide rib, which is conducive to shortening the movement path of the oil.

[0065] In one embodiment, the distance between the center of the second oil outlet hole and the input shaft is smaller than the distance between the center of the first oil outlet hole and the input shaft. The second oil injection port of the second nozzle is used to deliver oil to the meshing position of the input wheel and the intermediate driven wheel, and the second oil injection port of the second nozzle is used to deliver oil to the meshing position of the output wheel and the intermediate driving wheel.

[0066] In the embodiment of the present application, the distance between the center of the second oil outlet and the input shaft is smaller than the distance between the center of the first oil outlet and the input shaft, and the second oil outlet is arranged between the electric control slot and the intermediate driven wheel. The intermediate driving wheel is coaxial with the intermediate driven wheel, and the outer diameter of the intermediate driving wheel is smaller than the outer diameter of the intermediate driven wheel, so the second oil outlet is also arranged between the electric control slot and the intermediate driving wheel. Compared with the first oil outlet, the second oil outlet is more convenient in position to deliver oil to the meshing point between the input wheel and the intermediate driven wheel, and the meshing point between the output wheel and the intermediate driving wheel, and can shorten the oil transmission path without increasing the space occupied by the nozzle.

[0067] In one embodiment, the slot wall of the motor slot includes a third oil outlet hole, and the third oil outlet hole is used to transmit the oil in the second internal flow channel to the stator cooling channel and the oil spray ring of the drive motor. The stator cooling channel is formed between a portion of the outer surface of the stator of the drive motor and the slot wall of the motor slot, and the extension direction of the stator cooling channel is parallel to the axial direction of the drive motor. The oil spray ring surrounds the end of the winding along the circumference of the drive motor, and the oil spray ring is used to spray oil to the end of the winding and the rotary bearing of the drive motor.

[0068] In an embodiment of the present application, the second internal flow channel is distributed inside the slot wall of the motor slot. The second internal flow channel transmits oil to the outer surface of the stator and the oil injection ring through the third oil outlet hole to achieve cooling of the stator, windings and rotary bearings, reduce the risk of over-temperature failure of the components of the drive motor, and help improve the working efficiency of the drive motor.

[0069] In one embodiment, the bottom of the first intermediate bearing groove includes a through hole, which penetrates the bottom of the first intermediate bearing groove. The through hole is opposite to the oil injection ring along the axial direction of the drive motor. The through hole is used to transport part of the oil in the motor groove to the first intermediate bearing groove to actively lubricate a bearing of the intermediate shaft.

[0070] In the embodiment of the present application, the oil sprayed by the oil spray ring to the end of the winding falls to the slot wall of the motor slot, and then flows into the first intermediate bearing slot through the through hole, so as to replenish the oil volume used to lubricate a bearing of the intermediate shaft. The through hole is opposite to the oil spray ring, which is conducive to reducing the difficulty of oil flowing from the motor slot into the first intermediate bearing slot.

[0071] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising a power battery and a powertrain as described in any one of the embodiments of the first aspect, wherein the powertrain is used to receive power from the power battery and to drive wheels of the electric vehicle.

[0072] In the embodiments of the present application, the powertrain described in the first aspect is applied to an electric vehicle. Since the lubrication effect of the powertrain is improved, it is helpful to ensure the smooth and safe driving of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] 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.

[0074] Figure 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0075] Figure 2 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0076] Figure 3 is an exploded diagram of a powertrain provided in an embodiment of the present application;

[0077] Figure 4 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0078] Figure 5 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0079] Figure 6 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0080] Figure 7 is a cross-sectional view of a powertrain provided in an embodiment of the present application;

[0081] Figure 8 yes Figure 5 A partial enlarged view of the M part of the powertrain shown;

[0082] Fig. 9 is an exploded diagram of a powertrain provided in an embodiment of the present application;

[0083] Fig.10 is an exploded diagram of a powertrain provided in an embodiment of the present application;

[0084] Fig.11 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0085] Fig.12 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0086] Fig.13 is a cross-sectional view of a powertrain provided in an embodiment of the present application;

[0087] Fig.14 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0088] Fig.15 It is a schematic diagram of a powertrain provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] 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.

[0090] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0091] Parallelism: The parallelism defined in the embodiments of the present application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for the existence of situations where the absolute parallelism is not caused by factors such as assembly tolerance, design tolerance, and structural flatness.

[0092] Perpendicularity: The perpendicularity defined in the embodiments of the present application is not limited to an absolute perpendicular intersection relationship, and it is allowed that there are situations where the intersection is not absolutely perpendicular due to factors such as assembly tolerance, design tolerance, and structural flatness. Small angle errors are allowed, for example, within the range of 80 to 100 degrees, which can be understood as a perpendicular relationship.

[0093] The current powertrain has the problem of insufficient lubrication. An embodiment of the present application provides a powertrain, the housing of which includes a reducer slot, a reducer end cover, a motor slot and an electric control slot. The reducer end cover is used to enclose the notch of the reducer slot, and the reducer slot is used to accommodate the input shaft, intermediate shaft and output shaft of the reducer in the powertrain. The intermediate shaft is used to transmit and connect the input shaft and the output shaft. The motor slot is used to accommodate the drive motor of the powertrain. The electric control slot is used to accommodate the motor controller of the powertrain. The notch of the reducer slot and the notch of the motor slot are opposite to each other along the axial direction of the drive motor, and the bottom of the reducer slot and the bottom of the electric control slot are adjacent to each other along the axial direction of the drive motor. The electric control slot is stacked on the reducer slot and the motor slot, and the stacking direction of the electric control slot, the reducer slot and the motor slot intersects with the axial direction of the drive motor.

[0094] The internal flow channel of the housing includes a first internal flow channel, and the first internal flow channel is used to receive the oil output by the oil pump of the power assembly. The groove bottom of the reducer groove includes a first oil outlet hole, and the first oil outlet hole is used to transmit the oil in the first internal flow channel to the reducer groove through a first nozzle to actively lubricate a bearing of the intermediate shaft and a bearing of the output shaft. The first oil outlet hole is distributed between the intermediate shaft and the output shaft, and the first oil outlet hole is close to the electric control groove relative to the intermediate shaft and the output shaft along the stacking direction of the electric control groove and the reducer groove.

[0095] The embodiment of the present application utilizes the first oil outlet hole to actively lubricate a bearing of the intermediate shaft and a bearing of the output shaft, which is beneficial to improving lubrication efficiency and reducing the number of oil outlet holes in the housing. The power assembly provided by the embodiment of the present application can be applied to electric vehicles.

[0096] See also Figure 1 , Figure 1 A schematic diagram of an electric vehicle 1 provided in an embodiment of the present application. In one embodiment, the electric vehicle 1 includes a powertrain 10 and a power battery 20. In one embodiment, the electric vehicle 1 also includes a frame 30, and the frame 30 is used to install the powertrain 10 and the power battery 20. Among them, the frame 30 is the structural skeleton of the electric vehicle 1, and can bear the internal and external environmental loads of the electric vehicle 1. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device. The power battery 20 is used to supply power to the powertrain 10, and the power battery 20 can also be called a battery pack. The powertrain 10 is the power source of the electric vehicle 1, and the powertrain 10 is used to drive the wheels 40 of the electric vehicle 1.

[0097] See also Figure 2 , Figure 2 Schematic diagram of a powertrain 10 provided in an embodiment of the present application. In one embodiment, the powertrain 10 includes a reducer 200, a drive motor 300, and a motor controller 400. The power battery is used to supply power to the drive motor 300 through the motor controller 400. The drive motor 300 is used to convert the electrical energy transmitted by the power battery into mechanical energy, and then transmit the mechanical energy to the reducer 200 to drive the wheel 40 to rotate.

[0098] In one embodiment, the power assembly 10 further includes an oil pump 500 , and the oil pump 500 is used to deliver oil to at least one of the reducer 200 , the drive motor 300 , or the motor controller 400 .

[0099] In one embodiment, the motor controller 400 is used to convert the direct current transmitted by the power battery 20 into alternating current. In one embodiment, the motor controller 400 is used to control the drive motor 300 and the reducer 200 .

[0100] In one embodiment, the drive motor 300 includes a stator 310, a rotor 320 and a motor shaft 330. The winding 311 of the stator 310 generates an alternating magnetic flux after the alternating current converted by the motor controller 400 is passed through it. The alternating magnetic flux generated by the winding 311 interacts with the permanent magnetic flux generated by the rotor 320, so that the rotor 320 rotates relative to the stator 310. The rotor 320 is fixedly connected to the motor shaft 330 so that the motor shaft 330 rotates with the rotor 320. The stator 310 is rotationally connected to the motor shaft 330 so that the motor shaft 330 can rotate relative to the stator 310 to convert electrical energy into mechanical energy. The output end of the motor shaft 330 is used to transmit mechanical energy.

[0101] In one embodiment, the shaft and gears of the reducer 200 are used to change the transmission ratio between the drive motor 300 and the wheel. In one embodiment, the inner ring of the bearing of the reducer 200 is fixed to the shaft of the reducer 200, and the bearing of the reducer 200 is used to position and support the shaft of the reducer 200. Among them, the shaft of the reducer 200 includes an input shaft 210, an intermediate shaft 220 and an output shaft 230, and the gears of the reducer 200 include an input wheel 240, an intermediate driven wheel 250a, an intermediate driving wheel 250b and an output wheel 260. The reducer 200 also includes a differential 600, and the differential 600 is used to realize that the left and right wheels rotate at different speeds. The input shaft 210 is used to drive the motor shaft 330 of the drive motor 300, the intermediate shaft 220 is used to drive the input shaft 210 and the output shaft 230, and the output shaft 230 is used to drive the differential 600. The input wheel 240 is fixed to the input shaft 210, the intermediate driven wheel 250a and the intermediate driving wheel 250b are fixed to the intermediate shaft 220, and the output wheel 260 is fixed to the output shaft 230. The input wheel 240 is used to mesh with the intermediate driven wheel 250a, and the intermediate driving wheel 250b is used to mesh with the output wheel 260.

[0102] In one embodiment, the input shaft 210 and the motor shaft 330 are fixedly connected by spline fitting, and the axial direction of the input shaft 210 is parallel to the axial direction of the drive motor 300 .

[0103] In one embodiment, the reducer 200 is a parallel axis reducer 200 , that is, the axial direction of the input shaft 210 is parallel to the axial direction of the intermediate shaft 220 and the axial direction of the output shaft 230 .

[0104] During the operation of the powertrain, the reducer bearings need to rotate at high speed with the reducer shaft and bear various loads. Therefore, one of the key factors to improve bearing reliability is the lubrication effect of the bearings. If the lubrication is insufficient and the bearings lack lubricating oil to form an oil film, it will cause rapid wear of the bearings, which may cause safety risks in severe cases.

[0105] The embodiments of the present application can enhance the lubrication effect on the bearings of the reducer by improving the lubrication method for the bearings of the reducer, thereby ensuring the normal operation of the powertrain and the electric vehicle.

[0106] The powertrain 10 provided in the embodiment of the present application is described in detail below.

[0107] Please refer to Figures 2 to 5 , Figure 3 An exploded view of a powertrain 10 provided in an embodiment of the present application, Figure 4 A schematic diagram of a powertrain 10 provided in an embodiment of the present application, Figure 5 A schematic diagram of a powertrain 10 provided in an embodiment of the present application.

[0108] In one embodiment, the housing 100 of the power assembly 10 includes a reducer slot 110, a reducer end cover 120, a motor slot 130, and an electric control slot 140. The reducer end cover 120 is used to enclose the notch of the reducer slot 110, and the reducer slot 110 is used to accommodate the input shaft 210, the intermediate shaft 220, and the output shaft 230 of the reducer 200 in the power assembly 10. The intermediate shaft 220 is used to drive and connect the input shaft 210 and the output shaft 230. The notch of the reducer slot 110 and the notch of the motor slot 130 are opposite to each other along the axial direction O of the driving motor 300 in the power assembly 10, and the electric control slot 140 is stacked on the reducer slot 110 and the motor slot 130.

[0109] The internal flow channel of the housing 100 includes a first internal flow channel 150a, and the first internal flow channel 150a is used to receive the oil output by the oil pump 500 of the power assembly 10. The groove bottom of the reducer groove 110 includes a first oil outlet hole 111, and the first oil outlet hole 111 is used to transmit the oil in the first internal flow channel 150a through the first nozzle 270 to actively lubricate a bearing 221 of the intermediate shaft 220 and a bearing 231 of the output shaft 230. The first oil outlet hole 111 is distributed between the intermediate shaft 220 and the output shaft 230, and along the stacking direction of the electric control groove 140 and the reducer groove 110, the first oil outlet hole 111 is close to the electric control groove 140 relative to the intermediate shaft 220 and the output shaft 230.

[0110] In the embodiment of the present application, for ease of description, a bearing 231 of the output shaft 230 is referred to as bearing 231a, and a bearing 221 of the intermediate shaft 220 is referred to as bearing 221a. In one embodiment, the inner ring of the bearing 231a is fixed to the output shaft 230, and the inner ring of the bearing 221a is fixed to the intermediate shaft 220.

[0111] In the embodiment of the present application, the motor slot 130 is used to accommodate the drive motor 300, and the electric control slot 140 is used to accommodate the motor controller 400. In one embodiment, the stacking direction of the electric control slot 140 and the reducer slot 110 intersects at the axial direction O of the drive motor 300. In one embodiment, the stacking direction of the electric control slot 140 and the reducer slot 110 is perpendicular to the axial direction O of the drive motor 300, which is conducive to controlling the overall axial length of the power assembly 10.

[0112] In the embodiment of the present application, the intermediate shaft 220 is used to transmit the power from the input shaft 210 to the output shaft 230. The bearing 231a and the bearing 221a rotate with the output shaft 230 and the intermediate shaft 220 respectively, and it is necessary to ensure that the bearing 231a and the bearing 221a are adequately lubricated to extend the service life of the reducer 200 and improve the safety performance of the power assembly 10.

[0113] However, currently, the lubrication method for the bearings of the reducer 200 is usually passive lubrication: by collecting the oil thrown out by the rotating parts such as the gears of the reducer 200, or collecting the oil leaked from certain structures, and then guiding the collected oil to the bearings of the reducer 200. This passive lubrication method is limited by the rotation speed of the rotating parts and the temperature of the oil. If the rotation speed of the rotating parts is too low, the oil will lack sufficient power during the transmission process, and if the temperature of the oil is too low, the oil viscosity will be high. Both of the above factors will have a negative impact on the collection of the oil, which is not conducive to improving the lubrication efficiency.

[0114] In the embodiment of the present application, in order to avoid the defects caused by only passive lubrication of the bearings of the reducer 200, the embodiment of the present application uses an oil pump 500 to actively deliver oil to the bearings of the reducer 200. Driven by the oil pump 500, the flow of the oil is not easily affected by the rotation speed of the rotating parts and the oil temperature, so that the bearing 231a and the bearing 221a can be stably lubricated. In one embodiment, the oil can be any one of ethylene glycol cooling oil, synthetic oil and mineral oil.

[0115] Among them, active lubrication involves the problem of oil delivery. The embodiment of the present application utilizes the first internal flow channel 150a to receive the oil from the oil pump 500. The first internal flow channel 150a is the internal flow channel of the housing 100, and is integrally formed with the housing 100, and has strong structural stability. The first internal flow channel 150a is located inside the housing 100 and can also avoid interference from the drive motor 300 or the reducer 200, which is conducive to ensuring that the first internal flow channel 150a stably delivers oil. In addition, the first internal flow channel 150a does not occupy the accommodation space of the housing 100 of the powertrain 10, which is conducive to realizing the miniaturized design of the powertrain 10.

[0116] In the embodiment of the present application, the first oil outlet hole 111 is used to transmit the oil of the first internal flow channel 150a through the first nozzle 270. By using the first nozzle 270 to transmit the oil, the position layout of the first oil outlet hole 111 can be adjusted according to the actual lubrication needs, which is conducive to expanding the coverage of the oil in the reducer groove 110. In the embodiment of the present application, the first oil outlet hole 111 is arranged between the output shaft 230 and the intermediate shaft 220, which can take into account the active lubrication of the bearing 231a and the bearing 221a, improve the lubrication efficiency, and also help to reduce the number of oil outlet holes of the housing 100 of the power assembly 10, and reduce the risk of damage to the structural strength of the housing 100 of the power assembly 10. The first oil outlet hole 111 uses a nozzle to transmit the oil, so that the opening direction of the first oil outlet hole 111 does not have to directly point to the bearing 231a and the bearing 221a, which is conducive to reducing the processing difficulty and cost of the first oil outlet hole 111.

[0117] In the embodiment of the present application, the groove bottom of the reducer groove 110 is adjacent to the groove bottom of the motor groove 130 along the axial direction O of the drive motor 300. It can be understood that the structural strength and vibration resistance of the reducer groove 110 are generally better than the reducer end cover 120. Compared with the first oil outlet 111 distributed in the reducer end cover 120, the embodiment of the present application arranges the first oil outlet 111 at the groove bottom of the reducer groove 110, which can enhance the stability of the first oil outlet 111 transmitting oil to the first nozzle 270 and reduce the interference of the first nozzle 270. In one embodiment, the first oil outlet 111 is used to fix the first nozzle 270.

[0118] In the embodiment of the present application, along the stacking direction of the electric control slot 140 and the reducer slot 110, the distance between the first oil outlet 111 and the electric control slot 140 is smaller than the distance between the intermediate shaft 220 and the output shaft 230 and the electric control slot 140. The first oil outlet 111 is close to the electric control slot 140 relative to the intermediate shaft 220 and the output shaft 230, which is convenient for the oil to move with the help of gravity after being sprayed from the first nozzle 270, which is beneficial to reduce the power loss of the oil in the transmission path. If the first oil outlet 111 is far away from the electric control slot 140 relative to the output shaft 230 and the intermediate shaft 220, the oil sprayed from the first nozzle 270 needs to resist the gravity, which may cause the oil to have insufficient power to move to the bearings 231a and 221a, which is not conducive to improving the lubrication efficiency of the bearings 231a and 221a.

[0119] Please refer to Figures 5 to 7 , Figure 6 A schematic diagram of a powertrain 10 provided in an embodiment of the present application, Figure 7 A cross-sectional view of a powertrain 10 provided in an embodiment of the present application.

[0120] In one embodiment, the first internal flow channel 150 a is distributed inside the groove bottom of the reducer groove 110 , and the extension direction of the first internal flow channel 150 a intersects with the opening direction of the first oil outlet hole 111 .

[0121] In the embodiment of the present application, the first internal flow channel 150a is distributed inside the groove bottom of the reducer groove 110, which is conducive to enhancing the structural stability of the first internal flow channel 150a. The first internal flow channel 150a and the first oil outlet hole 111 are both distributed at the groove bottom of the reducer groove 110, which facilitates the direct connection between the first internal flow channel 150a and the first oil outlet hole 111, and reduces the difficulty of oil flowing from the first internal flow channel 150a to the first oil outlet hole 111. In the embodiment of the present application, the extension direction of the first internal flow channel 150a intersects with the opening direction of the first oil outlet hole 111, and the first oil outlet hole 111 can change the flow direction of the oil, so that the path of the first internal flow channel 150a does not have to directly point to the bearing 231a and the bearing 221a.

[0122] In one embodiment, the opening direction of the first oil outlet hole 111 is perpendicular to the extending direction of the first internal flow channel 150 a. In one embodiment, the opening direction of the first oil outlet hole 111 is parallel to the axial direction O of the driving motor 300 .

[0123] Please continue reading Figures 5 to 7 In one embodiment, the oil pump 500 of the power assembly 10 is distributed on the side of the intermediate shaft 220 and the output shaft 230 away from the electronically controlled tank 140 , and the first internal flow channel 150 a is distributed between the intermediate shaft 220 and the output shaft 230 .

[0124] In the embodiment of the present application, the first internal flow channel 150a and the oil pump 500 are arranged compactly, which facilitates the first internal flow channel 150a to connect with the oil pump 500, shortens the length of the first internal flow channel 150a, reduces the power loss of the oil transmitted in the first internal flow channel 150a, and improves the lubrication efficiency of the bearing 231a and the bearing 221a. The first internal flow channel 150a and the first oil outlet 111 are both distributed between the intermediate shaft 220 and the output shaft 230, which is conducive to shortening the transmission path of the oil. In addition, the embodiment of the present application reuses the space between the intermediate shaft 220 and the output shaft 230, which is convenient for controlling the volume of the power assembly 10. In one embodiment, the oil pump 500 is distributed on the side of the intermediate shaft 220 and the output shaft 230 away from the electric control tank 140, which is also conducive to the oil pump 500 to recover the oil to improve the utilization rate of the oil.

[0125] Please refer to Figure 4 , Figure 5 and Figure 8 , Figure 8 for Figure 5 A partial enlarged view of the M portion of the powertrain 10 is shown.

[0126] In one embodiment, the groove bottom of the reducer groove 110 includes a first output bearing groove 112 , and the first output bearing groove 112 is used to accommodate the bearing 231 a of the output shaft 230 .

[0127] The first oil outlet hole 111 is distributed between the intermediate shaft 220 and the first output bearing groove 112. The first oil injection port 271 of the first nozzle 270 is used to transmit oil to the notch 1121 of the groove wall of the first output bearing groove 112, and the notch 1121 of the groove wall of the first output bearing groove 112 is distributed between the first oil outlet hole 111 and the output shaft 230.

[0128] In the embodiment of the present application, for the convenience of description, the notch 1121 distributed between the first oil outlet hole 111 and the output shaft 230 in the groove wall of the first output bearing groove 112 is recorded as a notch 1121a, and the first oil injection port 271 in the first nozzle 270 for transmitting oil to the notch 1121a is recorded as a first oil injection port 271a. The first oil injection port 271a of the first nozzle 270 is used to spray oil to the notch 1121a of the first output bearing groove 112, and the oil flows into the first output bearing groove 112 from the notch 1121a to actively lubricate the bearing 231a. Lubricating the bearing 231a by spraying oil from a nozzle can reduce the number of internal flow channels of the housing 100 and reduce the processing difficulty and cost of the housing 100 of the power assembly 10.

[0129] In the embodiment of the present application, the distance between the notch 1121a of the first output bearing groove 112 and the first oil outlet hole 111 is smaller than the distance between the output shaft 230 and the first oil outlet hole 111, and the notch 1121a of the first output bearing groove 112 is distributed on the side of the output shaft 230 close to the first oil outlet hole 111, which helps to shorten the path of the oil moving from the first nozzle 270 to the first output bearing groove 112, thereby enhancing the lubrication effect on the bearing 231a.

[0130] Please continue reading Figure 4 , Figures 5 to 8 In one embodiment, the first output bearing groove 112 is recessed relative to the groove bottom of the motor groove 130 away from the reducer end cover 120 along the axial direction O of the output shaft 230. The first oil guide rib 161 at the groove bottom of the reducer groove 110 extends from the motor groove 130 toward the notch 1121a of the groove wall of the first output bearing groove 112. Along the stacking direction of the electric control groove 140 and the reducer groove 110, the first oil guide rib 161 is distributed on the side of the notch 1121a of the groove wall of the first output bearing groove 112 away from the first oil outlet 111.

[0131] In the embodiment of the present application, the first output bearing groove 112 is recessed at the bottom of the groove away from the motor groove 130 along the axial direction O of the output shaft 230, which is equivalent to the first output bearing groove 112 utilizing the space on the outer peripheral side of the motor groove 130. It can expand the accommodating space of the reducer groove 110 without increasing the axial length of the powertrain 10, which is beneficial to optimizing the layout of the reducer 200.

[0132] In the embodiment of the present application, when the first output bearing groove 112 is recessed away from the reducer end cover 120, the oil sprayed from the first oil injection port 271a of the first nozzle 270 is easy to leak in the notch 1121a of the first output bearing groove 112. In order to improve the lubrication efficiency, in the embodiment of the present application, the groove bottom of the reducer groove 110 includes a first oil guide rib 161, which is distributed on the side of the notch 1121a of the first output bearing groove 112 away from the first oil outlet 111, and the first oil guide rib 161 points from the motor groove 130 to the notch 1121a. The first oil guide rib 161 used to cooperate with the notch 1121a is recorded as the first oil guide rib 161a. The oil leaked from the notch 1121a can continue to flow into the notch 1121a under the guidance of the first oil guide rib 161a, reducing the loss of oil.

[0133] Please continue reading Figure 8 In one embodiment, the first oil guide rib 161a is used to form an oil collecting groove 113 with the groove wall of the first output bearing groove 112, and the concave direction of the oil collecting groove 113 along the axial direction O of the output shaft 230 is away from the reducer end cover 120. The groove depth of the oil collecting groove 113 along the axial direction O of the output shaft 230 is less than the groove depth of the first output bearing groove 112, and the notch 1121a of the groove wall of the first output bearing groove 112 faces the oil collecting groove 113.

[0134] In the embodiment of the present application, the oil collecting groove 113 formed by the first oil guide rib 161a and the groove wall of the first output bearing groove 112 is recorded as the oil collecting groove 113a. When the oil sprayed by the first nozzle 270 splashes at the notch 1121a, if the groove wall of the first output bearing groove 112 cannot play the role of blocking the oil, it will cause some oil to be difficult to flow into the first output bearing groove 112. In the embodiment of the present application, the groove wall of the first output bearing groove 112 cooperates with the first oil guide rib 161a to form the oil collecting groove 113a, and the oil collecting groove 113a can block the splashing oil and drain it into the notch 1121a, which is conducive to reducing the loss of oil. In the embodiment of the present application, the groove depth of the oil collecting groove 113a is less than the groove depth of the first output bearing groove 112, which is conducive to avoiding the accumulation of oil in the oil collecting groove 113a and accelerating the flow of oil.

[0135] Please continue reading Figure 4 , Figure 5 and Figure 8In one embodiment, the groove bottom of the reducer groove 110 includes a first intermediate bearing groove 114, and the first intermediate bearing groove 114 is used to accommodate the bearing 221a of the intermediate shaft 220. Along the axial direction O of the intermediate shaft 220, the first intermediate bearing groove 114 protrudes toward the reducer end cover 120 relative to the first oil outlet hole 111, and the first intermediate bearing groove 114 is away from the first oil outlet hole 111 relative to the output shaft 230.

[0136] The first oil injection port 271 of the first nozzle 270 is used to transfer oil to the second oil guide rib 162 at the bottom of the reducer groove 110. The second oil guide rib 162 extends from the electric control groove 140 toward the notch 1141 of the groove wall of the first intermediate bearing groove 114, and the notch 1141 of the groove wall of the first intermediate bearing groove 114 faces the electric control groove 140 and away from the intermediate shaft 220.

[0137] In the embodiment of the present application, for ease of description, the first oil injection port 271 in the first nozzle 270 for transmitting oil to the second oil guide rib 162 is recorded as the first oil injection port 271b. The first oil outlet 111 transmits oil to the notch 1121a of the first output bearing groove 112 and the notch 1141 of the first intermediate bearing groove 114 through the first oil injection port 271a and the first oil injection port 271b of the first nozzle 270, respectively. Integrating the first oil injection port 271a and the first oil injection port 271b into the first nozzle 270 is conducive to reducing the number of nozzles.

[0138] In the embodiment of the present application, the first intermediate bearing groove 114 is relatively far from the first oil outlet 111. If the first oil injection port 271b of the first nozzle 270 directly sprays oil to the notch 1141 of the first intermediate bearing groove 114, the length of the first nozzle 270 needs to be extended. In addition, the first intermediate bearing groove 114 is protruded toward the reducer end cover 120 relative to the first oil outlet 111, so that the groove wall of the first intermediate bearing groove 114 will block the oil sprayed from the first oil injection port 271b of the first nozzle 270. In order to reduce the space occupied by the first nozzle 270 and enhance the effect of oil lubrication of the bearing 221a, in the embodiment of the present application, the groove bottom of the reducer groove 110 also includes a second oil guide rib 162, which is distributed between the electric control groove 140 and the notch 1141 of the first intermediate bearing groove 114. The second oil guide rib 162 can be used as an intermediate structure for transmitting oil between the first nozzle 270 and the notch 1141. The second oil guide rib 162 for transmitting the oil from the first oil injection port 271b to the gap 1141 is recorded as the second oil guide rib 162a. The second oil guide rib 162a is used to receive the oil sprayed from the first oil injection port 271b of the first nozzle 270, and to transmit the oil to the gap 1141 of the first middle bearing groove 114, so that the first oil outlet 111 and the first nozzle 270 can adapt to the application scenario where the first middle bearing groove 114 is placed below.

[0139] Please continue reading Figure 8 In one embodiment, the inner diameter of the notch 1141 of the groove wall of the first intermediate bearing groove 114 increases along the intermediate shaft 220 toward the second oil guide rib 162 a.

[0140] In the embodiment of the present application, the notch 1141 of the first intermediate bearing groove 114 is directed from the intermediate shaft 220 toward the second oil guide rib 162a, and the notch 1141 is used to receive the oil delivered by the first nozzle 270 to the second oil guide rib 162a, and to transmit the oil to the first intermediate bearing groove 114. The inner diameter of the end of the notch 1141 close to the second oil guide rib 162a is relatively large, and the oil guided by the second oil guide rib 162a is easier to flow into the notch 1141, which can improve the efficiency of the notch 1141 in receiving the oil and reduce the oil loss. The inner diameter of the other end of the notch 1141 close to the intermediate shaft 220 is relatively small, so that the inner wall of the notch 1141 can play a role in gathering and guiding the oil, which helps to reduce the flow resistance of the oil.

[0141] Please refer to Figure 8 and Fig. 9 , Fig. 9 An exploded view of a powertrain 10 provided in an embodiment of the present application.

[0142] In one embodiment, the intermediate driving wheel 250b of the reducer 200 and the intermediate driven wheel 250a of the reducer 200 are fixed to the intermediate shaft 220. The first oil outlet hole 111, the first intermediate bearing groove 114 and the second oil guide rib 162a are distributed on the side of the intermediate driving wheel 250b away from the intermediate driven wheel 250a along the axial direction O of the intermediate shaft 220, and the outer diameter of the intermediate driving wheel 250b is smaller than the outer diameter of the intermediate driven wheel 250a.

[0143] Among them, along the axial direction O of the intermediate shaft 220, the second oil guide rib 162a protrudes toward the intermediate driving wheel 250b relative to the first intermediate bearing groove 114, and along the radial direction R of the intermediate shaft 220, the intermediate driving wheel 250b is distributed between the second oil guide rib 162a and the intermediate shaft 220. Along the radial direction R of the intermediate shaft 220, the distance between the second oil guide rib 162a and the intermediate driving wheel 250b is smaller than the distance between the center of the first oil outlet hole 111 and the intermediate driving wheel 250b.

[0144] In the embodiment of the present application, one surface of the intermediate driving wheel 250b along the axial direction O of the intermediate shaft 220 faces the groove bottom of the reducer groove 110, and the other surface of the intermediate driving wheel 250b along the axial direction O of the intermediate shaft 220 faces the intermediate driven wheel 250a. The intermediate driven wheel 250a is used to mesh with the input wheel 240, and the intermediate driving wheel 250b is used to mesh with the output wheel 260. The outer diameter of the intermediate driving wheel 250b is smaller than the outer diameter of the intermediate driven wheel 250a, so that the reducer 200 can play the role of reducing speed and increasing torque.

[0145] In the embodiment of the present application, in addition to being used to lubricate the bearing 221a of the intermediate shaft 220, the second oil guide rib 162a can also actively lubricate the intermediate driven wheel 250a and the intermediate shaft 220, thereby realizing the reuse of the second oil guide rib 162a. Specifically, the axial distance between the second oil guide rib 162a and the other surface of the intermediate driving wheel 250b is smaller than the axial distance between the groove wall of the first intermediate bearing groove 114 and the other surface of the intermediate driving wheel 250b, which is equivalent to the second oil guide rib 162a extending to one side of the intermediate driving wheel 250b along the radial direction R of the intermediate shaft 220. The second oil guide rib 162a can transmit the oil in the first internal flow channel 150a to the intermediate driving wheel 250b and the intermediate shaft 220, and the intermediate shaft 220 can continue to throw the oil to the first intermediate bearing groove 114. The second oil guide rib 162 a can lubricate the intermediate driving wheel 250 b while lubricating the bearing 221 a , which is beneficial to reducing the wear of the intermediate driving wheel 250 b and the output wheel 260 .

[0146] In the embodiment of the present application, the outer diameter of the intermediate driving wheel 250b is relatively small, and the distance between the second oil guide rib 162a and the intermediate driving wheel 250b is smaller than the distance between the first oil outlet hole 111 and the intermediate driving wheel 250b. Compared with directly spraying oil to the intermediate driving wheel 250b through the first nozzle 270, the embodiment of the present application lubricates the intermediate driving wheel 250b with the help of the second oil guide rib 162a, thereby avoiding extending the length of the first nozzle 270.

[0147] In one embodiment, the projection of the second oil guide rib 162a along the radial direction R of the intermediate shaft 220 partially overlaps with the projection of the intermediate driving wheel 250b.

[0148] Please refer to Fig. 9 and Fig.10 , Fig.10 An exploded view of a powertrain 10 provided in an embodiment of the present application.

[0149] In one embodiment, the differential 600 is arranged between the first output bearing groove 112 and the reducer end cover 120. The output wheel 260 of the reducer 200 is used to drive and connect the differential housing 610 of the differential 600. The differential housing 610 is used to accommodate the planetary shafts 620 and the differential gear set 630 of the differential 600. The planetary shafts 620 are used to drive and connect the differential gear set 630. The differential housing 610 includes a window 611, which penetrates the differential housing 610, and the planetary shafts 620 are exposed to the window 611 of the differential housing 610. The window 611 of the differential housing 610 is distributed between the output shaft 230 and the first oil outlet 111. The first oil injection port 271c of the first nozzle 270 is used to transmit oil to the window 611 of the differential housing 610.

[0150] In the embodiment of the present application, the distance between the window 611 of the differential housing 610 and the first oil outlet hole 111 is smaller than the distance between the output shaft 230 and the first oil outlet hole 111. The window 611 of the differential housing 610 is distributed on the side of the output shaft 230 close to the first oil outlet hole 111, which helps to shorten the path of the oil moving from the first nozzle 270 to the window 611 of the differential housing 610, thereby enhancing the lubrication effect on the differential 600.

[0151] In the embodiment of the present application, the planetary shaft 620 is used as an intermediate medium for lubricating the differential gear set 630. By diverting the oil to the planetary shaft 620 and expanding the coverage of the oil with the help of the rotation of the planetary shaft 620, it is beneficial to realize the redistribution of the oil in the differential housing 610.

[0152] Please refer to Figure 5 , Fig.11 and Fig.12 , Fig.11 A schematic diagram of a powertrain 10 provided in an embodiment of the present application, Fig.12 A schematic diagram of a powertrain 10 provided in an embodiment of the present application.

[0153] In one embodiment, the internal flow channel of the housing 100 includes a second internal flow channel 150b, which is distributed inside the groove wall of at least one of the reducer groove 110 or the motor groove 130. The inlet of the second internal flow channel 150b is used to receive the oil of the first internal flow channel 150a through the heat exchanger 900 of the power assembly 10. The outlet of the second internal flow channel 150b is used to transmit the oil of the first internal flow channel 150a to actively lubricate one bearing 211 of the input shaft 210 and another bearing 211 of the input shaft 210.

[0154] The groove bottom of the reducer groove 110 includes a second oil outlet hole 115, which is used to transmit the oil of the first internal flow channel 150a through the second nozzle 280 to actively lubricate another bearing 221 of the intermediate shaft 220 and another bearing 231 of the output shaft 230.

[0155] In the embodiment of the present application, for ease of description, one bearing 211 of the input shaft 210 is referred to as bearing 211a, the other bearing 211 of the input shaft 210 is referred to as bearing 211b, the other bearing 221 of the intermediate shaft 220 is referred to as bearing 221b, and the other bearing 231 of the output shaft 230 is referred to as bearing 231b.

[0156] In the embodiment of the present application, the position of the second internal flow channel 150b inside the housing 100 is different from that of the first internal flow channel 150a. The second internal flow channel 150b is distributed inside the groove wall of at least one of the reducer groove 110 or the motor groove 130. The second internal flow channel 150b is connected to the first internal flow channel 150a, and the coverage of the oil in the power assembly 10 can be expanded with the help of the second internal flow channel 150b. The heat exchanger 900 is used to cool the oil transmitted from the first internal flow channel 150a to the second internal flow channel 150b, so that the oil in the second internal flow channel 150b can lubricate and cool the components of the power assembly 10. In one embodiment, when the second internal flow channel 150b is distributed on the groove wall of the motor groove 130, the oil in the second internal flow channel 150b can be used to cool the drive motor 300. In one embodiment, the heat exchanger 900 and the electric control tank 140 are stacked on the same side of the reducer tank 110 along the stacking direction of the electric control tank 140 and the reducer tank 110 .

[0157] In the embodiment of the present application, the second oil outlet hole 115 is used to transmit the oil of the first internal flow channel 150a through the second nozzle 280. By using the second nozzle 280 to transmit the oil, the position layout of the second oil outlet hole 115 can be adjusted according to the actual lubrication needs, which is conducive to expanding the coverage of the oil in the powertrain 10. The second oil outlet hole 115 uses a nozzle to transmit the oil, so that the opening direction of the second oil outlet hole 115 does not have to directly point to the bearing 221b and the bearing 231b, which is conducive to reducing the processing difficulty and cost of the first oil outlet hole 111. Compared with the second oil outlet hole 115 distributed on the reducer end cover 120, the embodiment of the present application arranges the second oil outlet hole 115 at the bottom of the reducer groove 110, which can enhance the stability of the second oil outlet hole 115 transmitting the oil to the second nozzle 280 and reduce the interference of the second nozzle 280. In one embodiment, the second oil outlet hole 115 is used to fix the second nozzle 280.

[0158] In the embodiment of the present application, the first internal flow channel 150a and the second oil outlet hole 115 are both distributed at the bottom of the reducer groove 110, so as to facilitate direct connection between the first internal flow channel 150a and the second oil outlet hole 115, thereby reducing the difficulty of oil flowing from the first internal flow channel 150a to the second oil outlet hole 115.

[0159] In the embodiment of the present application, active lubrication of the bearings of the input shaft 210, the intermediate shaft 220 and the output shaft 230 is achieved through the cooperation of the first internal flow channel 150a, the second internal flow channel 150b, the first oil outlet hole 111 and the second oil outlet hole 115, which is beneficial to reducing the risk of local insufficient lubrication of the reducer 200.

[0160] Please continue reading Figures 4 to 6In one embodiment, the groove bottom of the reducer groove 110 includes a first input bearing groove 116, and the first input bearing groove 116 is used to accommodate the bearing 211a of the input shaft 210. The first input bearing groove 116 is recessed toward the motor groove 130 along the axial direction O of the input shaft 210 so that the groove bottom of the motor groove 130 forms an annular protrusion.

[0161] The second internal flow channel 150b is used to transmit oil to the oil holes 1161 of the first input bearing groove 116. The oil holes 1161 of the first input bearing groove 116 are distributed on the inner surface of the groove wall of the first input bearing groove 116. The opening direction of the oil holes 1161 of the first input bearing groove 116 along the radial direction R of the input shaft 210 is toward the axis of the first input bearing groove 116.

[0162] In the embodiment of the present application, the input shaft 210 of the reducer 200 is used for transmission connection with the motor shaft 330 of the drive motor 300. The axial direction O of the input shaft 210 is parallel to the axial direction O of the drive motor 300. The bottom of the first input bearing groove 116 along the axial direction O of the input shaft 210 is opposite to the bottom of the motor groove 130. The first input bearing groove 116 is recessed toward the motor groove 130 along the axial direction O of the input shaft 210. In this case, in order to facilitate the second internal flow channel 150b to communicate with the oil hole 1161 of the first input bearing groove 116, at least part of the second internal flow channel 150b is located inside the groove wall of the motor groove 130.

[0163] In the embodiment of the present application, since the oil of the first input bearing groove 116 comes from the second internal flow channel 150b instead of the nozzle, the first input bearing groove 116 is different from the first intermediate bearing groove 114 and the first output bearing groove 112. The oil is transported by the oil holes 1161 distributed on the inner surface of the groove wall, and the opening direction of the oil holes 1161 is along the radial direction R of the input shaft 210 toward the axis of the first input bearing groove 116. In one embodiment, a radial flow channel can be used to connect the second internal flow channel 150b and the oil hole 1161. The radial flow channel is equivalent to a radial branch of the second internal flow channel 150b, and the radial flow channel is distributed inside the groove bottom of the motor groove 130. In one embodiment, when the second internal flow channel 150b is adjacent to the groove wall of the first input bearing groove 116, the oil hole 1161 can also be directly connected to the second internal flow channel 150b.

[0164] In the embodiment of the present application, the first input bearing groove 116 is recessed toward the motor groove 130 , which is equivalent to borrowing part of the space in the motor groove 130 to form the first input bearing groove 116 , which is beneficial to reducing the axial length of the powertrain 10 while lubricating the bearing 211a of the input shaft 210 .

[0165] Please refer to Figures 11 to 13 , Fig.13A cross-sectional view of a powertrain 10 provided in an embodiment of the present application.

[0166] In one embodiment, the reducer end cover 120 includes a second input bearing groove 121 , a fixing hole 122 and an oil guide protrusion 123 . The second input bearing groove 121 is used to accommodate the bearing 211 b of the input shaft 210 , and the fixing hole 122 is used to accommodate the blocking member 127 .

[0167] The second input bearing groove 121 is recessed away from the reducer groove 110 along the axial direction O of the input shaft 210. The fixing hole 122 passes through the bottom of the second input bearing groove 121. The oil guide protrusion 123 is distributed on the surface of the reducer end cover 120 away from the reducer groove 110.

[0168] The internal flow channel of the housing 100 includes a third internal flow channel 150c, which is distributed inside the oil guide protrusion 123. The third internal flow channel 150c is used to transmit the oil in the second internal flow channel 150b to the oil hole 1211 of the second input bearing groove 121 and the oil hole 1221 of the fixing hole 122. The oil hole 1221 of the fixing hole 122 is distributed on the inner surface of the fixing hole 122, and the sealing member 127, the oil hole 1221 of the fixing hole 122 and the shaft cavity of the input shaft 210 are arranged in sequence along the axial direction O of the input shaft 210. The oil hole 1211 of the second input bearing groove 121 is distributed at the bottom of the second input bearing groove 121.

[0169] In the embodiment of the present application, the second input bearing groove 121 and the fixing hole 122 are both distributed in the reducer end cover 120, the second input bearing groove 121 is used to accommodate the bearing 211b, and the fixing hole 122 is used to fix the blocking member 127. In order to achieve active lubrication of the bearing 211b and the input shaft 210, the third internal flow channel 150c can be arranged in the reducer end cover 120 to guide the oil in the second internal flow channel 150b to the oil through hole 1211 and the oil through hole 1221. Specifically, the second input bearing groove 121 is recessed away from the reducer groove 110, so that the outer peripheral side of the second input bearing groove 121 has space for arranging the oil guide protrusion 123, and the third internal flow channel 150c is distributed inside the oil guide protrusion 123. In order to ensure that the third internal flow channel 150c can take into account the lubrication of the input shaft 210 and the bearing 211b, the oil holes 1211 of the second input bearing groove 121 need to be distributed at the bottom of the second input bearing groove 121, and the oil holes 1211 and the oil holes 1221 form parallel branches. If the oil holes 1211 of the second input bearing groove 121 are distributed on the inner surface of the groove wall of the second input bearing groove 121, since the distance between the groove wall of the second input bearing groove 121 and the third internal flow channel 150c is smaller than the distance between the fixing hole 122 and the third internal flow channel 150c, the oil in the third internal flow channel 150c needs to first flow into the second input bearing groove 121 to lubricate the bearing 211b, and then flow to the input shaft 210 through the fixing hole 122, which is not conducive to improving the lubrication efficiency.

[0170] In the embodiment of the present application, part of the oil in the third internal flow channel 150c can flow into the shaft cavity of the input shaft 210 through the oil hole 1221 of the fixing hole 122. In one embodiment, the oil flowing into the shaft cavity of the input shaft can continue to flow to the shaft cavity of the motor shaft, which is conducive to lubricating the mating part of the input shaft and the motor shaft and cooling the motor shaft. The opening direction of the fixing hole 122 is away from the bottom of the second input bearing groove 121, and the blocking member 127 is distributed in the fixing hole 122, which can prevent the oil flowing out of the oil hole 1221 of the fixing hole 122 from leaking.

[0171] Please refer to Figure 3 , Fig.11 and Fig.12 In one embodiment, the reducer end cover 120 includes a second intermediate bearing groove 124, which is used to accommodate the bearing 221b of the intermediate shaft 220. The second intermediate bearing groove 124 protrudes toward the intermediate driven wheel 250a of the reducer 200 along the axial direction O of the intermediate shaft 220, and the outer diameter of the intermediate driven wheel 250a is greater than the outer diameter of the second intermediate bearing groove 124.

[0172] The two third oil guide ribs 163 of the reducer end cover 120 along the circumferential direction C of the intermediate shaft 220 are distributed on both sides of the notch 1241 of the groove wall of the second intermediate bearing groove 124. The second oil outlet hole 115 is distributed between the electric control groove 140 and the intermediate driven wheel 250a, and the second oil outlet hole 115 is used to transmit oil to the gap between the two third oil guide ribs 163 through the second oil injection port 281 of the second nozzle 280.

[0173] In the embodiment of the present application, for ease of description, the second oil injection port 281 in the second nozzle 280 for transmitting oil to between two third oil guide ribs 163 is recorded as the second oil injection port 281a.

[0174] In the embodiment of the present application, one surface of the intermediate driven wheel 250a along the axial direction O of the intermediate shaft 220 faces the reducer end cover 120, and the other surface of the intermediate driven wheel 250a along the axial direction O of the intermediate shaft 220 faces the groove bottom of the reducer groove 110. The second intermediate bearing groove 124 is distributed in the reducer end cover 120, and the second oil outlet hole 115 is distributed in the groove bottom of the reducer groove 110, which is equivalent to the intermediate driven wheel 250a being arranged between the second intermediate bearing groove 124 and the second oil outlet hole 115. Among them, the outer diameter of the intermediate driven wheel 250a is larger than the outer diameter of the second intermediate bearing groove 124. If the second oil outlet hole 115 directly delivers oil to the notch 1241 of the second intermediate bearing groove 124 through the second nozzle 280, the oil may be blocked by the intermediate driven wheel 250a.

[0175] In this case, the embodiment of the present application arranges two third oil guide ribs 163 on both sides of the gap 1241, and the second oil injection port 281a of the second nozzle 280 sprays oil to the gap between the two third oil guide ribs 163. The two third oil guide ribs 163 can guide the oil to the gap 1241, which can effectively prevent the oil from being blocked by the intermediate driven wheel 250a, thereby improving the lubrication efficiency of the bearing 221b. In order to realize the transmission of oil from the second nozzle 280 to the gap between the two third oil guide ribs 163, the second oil outlet 115 needs to be arranged between the electric control slot 140 and the intermediate driven wheel 250a along the stacking direction of the electric control slot 140 and the reducer slot 110.

[0176] In the embodiment of the present application, the second intermediate bearing groove 124 protrudes from the reducer end cover 120 toward the intermediate driven wheel 250a, and the two third oil guide ribs 163 actually utilize the space on the outer peripheral side of the second intermediate bearing groove 124, and can effectively control the axial space occupied by the second intermediate bearing groove 124 and the two third oil guide ribs 163, which is conducive to realizing the miniaturization design of the reducer 200 and the powertrain 10.

[0177] Please continue reading Fig.11 and Fig.12In one embodiment, the reducer end cover 120 includes a second output bearing groove 125, and the second output bearing groove 125 is used to accommodate the bearing 231b of the output shaft 230. The second oil outlet 115 is used to transmit oil to the oil through hole 1251 of the groove wall of the second output bearing groove 125 through the second oil injection port 281 of the second nozzle 280. A third oil guide rib 163 is arranged on the side of the notch 1241 of the groove wall of the second intermediate bearing groove 124 facing the output shaft 230. The oil through hole 1251 of the groove wall of the second output bearing groove 125 is distributed between the output shaft 230 and a third oil guide rib 163.

[0178] In the embodiment of the present application, for ease of description, the oil hole 1251 distributed between the output shaft 230 and one third oil guide rib 163 in the groove wall of the second output bearing groove 125 is recorded as an oil hole 1251a, and the second oil injection port 281 in the second nozzle 280 for transmitting oil to the oil hole 1251a is recorded as a second oil injection port 281b. One third oil guide rib 163 is recorded as a third oil guide rib 163a, and another third oil guide rib 163 is recorded as a third oil guide rib 163b.

[0179] In the embodiment of the present application, the active lubrication of the bearing 231b accommodated in the second output bearing groove 125 and the bearing 221b accommodated in the second intermediate bearing groove 124 share the second oil outlet hole 115. When the second oil outlet hole 115 delivers oil to the third oil guide rib 163a and the third oil guide rib 163b through the second oil injection port 281a of the second nozzle 280, in order to reduce the difficulty of the second oil injection port 281b of the second nozzle 280 delivering oil to the oil through hole 1251a of the second output bearing groove 125, the oil through hole 1251a should be adjacent to the third oil guide rib 163a, which is conducive to shortening the movement path of the oil.

[0180] Please refer to Figure 5 and Fig.14 , Fig.14 A schematic diagram of a powertrain 10 provided in an embodiment of the present application.

[0181] In one embodiment, the distance between the center of the second oil outlet hole 115 and the input shaft 210 is smaller than the distance between the center of the first oil outlet hole 111 and the input shaft 210. The second oil injection port 281c of the second nozzle 280 is used to deliver oil to the meshing position of the input wheel 240 and the intermediate driven wheel 250a, and the second oil injection port 281d of the second nozzle 280 is used to deliver oil to the meshing position of the output wheel 260 and the intermediate driving wheel 250b.

[0182] In the embodiment of the present application, the distance between the center of the second oil outlet hole 115 and the input shaft 210 is smaller than the distance between the center of the first oil outlet hole 111 and the input shaft 210, and the second oil outlet hole 115 is arranged between the electric control slot 140 and the intermediate driven wheel 250a. The intermediate driving wheel 250b is coaxial with the intermediate driven wheel 250a, and the outer diameter of the intermediate driving wheel 250b is smaller than the outer diameter of the intermediate driven wheel 250a, so the second oil outlet hole 115 is also arranged between the electric control slot 140 and the intermediate driving wheel 250b. Compared with the first oil outlet hole 111, the second oil outlet hole 115 is more convenient in position to deliver oil to the meshing point between the input wheel 240 and the intermediate driven wheel 250a, and the meshing point between the output wheel 260 and the intermediate driving wheel 250b, and can shorten the transmission path of the oil without increasing the space occupied by the nozzle. Integrating the second fuel injection port 281a, the second fuel injection port 281b, the second fuel injection port 281c and the second fuel injection port 281d into the second nozzle 280 is beneficial to reducing the number of components in the power assembly 10 and simplifying the installation operation.

[0183] In one embodiment, the second oil injection port 281c and the second oil injection port 281d are flat nozzles. In the embodiment of the present application, the flat nozzle is easier to achieve a flat injection angle than a round nozzle, so that the oil can cover the gear meshing area more evenly, thereby enhancing the lubrication effect on the gears of the reducer 200.

[0184] See also Fig.15 , Fig.15 A schematic diagram of a powertrain 10 provided in an embodiment of the present application.

[0185] In one embodiment, the slot wall of the motor slot 130 includes a third oil outlet hole 131, and the third oil outlet hole 131 is used to transmit the oil in the second internal flow channel 150b to the stator cooling channel 340 and the oil spray ring. The stator cooling channel 340 is formed between a portion of the outer surface of the stator 310 and the slot wall of the motor slot 130, and the extension direction of the stator cooling channel 340 is parallel to the axial direction O of the drive motor 300. The oil spray ring surrounds the end of the winding 311 along the circumference of the drive motor 300, and the oil spray ring is used to spray oil to the end of the winding 311 and the rotary bearing of the drive motor 300.

[0186] In the embodiment of the present application, the second internal flow channel 150b is distributed inside the groove wall of the motor groove 130. The second internal flow channel 150b transmits oil to the outer surface of the stator 310 and the oil injection ring through the third oil outlet hole 131 to achieve cooling of the stator 310, the winding 311 and the rotary bearing, reduce the risk of over-temperature failure of the components of the drive motor 300, and help improve the working efficiency of the drive motor 300.

[0187] Please continue reading Figure 4 and Figure 6In one embodiment, the bottom of the first intermediate bearing groove 114 includes a through hole 1142, and the through hole 1142 runs through the bottom of the first intermediate bearing groove 114. The through hole 1142 is opposite to the oil injection ring along the axial direction O of the drive motor 300. The through hole 1142 is used to transport part of the oil in the motor groove 130 to the first intermediate bearing groove 114 to actively lubricate the bearing 221a.

[0188] In the embodiment of the present application, the oil sprayed by the oil spray ring to the end of the winding 311 falls to the groove wall of the motor groove 130, and then flows into the first intermediate bearing groove 114 through the through hole 1142, so as to replenish the amount of oil used to lubricate the bearing 221a. The through hole 1142 is opposite to the oil spray ring, which is conducive to reducing the difficulty of the oil flowing from the motor groove 130 into the first intermediate bearing groove 114.

[0189] Please continue reading Fig.15 . In one embodiment, the housing 100 of the power assembly 10 further includes a motor end cover 170, which is used to enclose the notch of the motor slot 130. The motor end cover 170 includes a motor bearing slot 171, which is used to accommodate the bearing of the motor shaft 330. The internal flow channel of the housing 100 also includes a fourth internal flow channel 150d, which is distributed inside the motor end cover 170. The fourth internal flow channel 150d is used to transmit the oil in the second internal flow channel 150b to the oil hole 1711 of the motor bearing slot 171. The oil hole 1711 of the motor bearing slot 171 is distributed on the inner surface of the slot wall of the motor bearing slot 171.

[0190] In the embodiment of the present application, the fourth internal flow channel 150d for conveying oil to the motor bearing groove 171 is located inside the motor end cover 170, which can effectively avoid the problem of oil leakage, improve the utilization rate of oil, and reduce the interference of rotating parts such as the rotor 320 on oil delivery, which is conducive to ensuring that the fourth internal flow channel 150d stably conveys oil to the motor bearing groove 171.

[0191] In the embodiment of the present application, the oil holes 1711 of the motor bearing groove 171 are distributed on the inner surface of the groove peripheral wall of the motor bearing groove 171, and the fourth internal flow channel 150d delivers oil to the motor bearing groove 171 through the oil holes 1711 of the motor bearing groove 171, which is equivalent to the fourth internal flow channel 150d being connected to the inner surface of the groove peripheral wall of the motor bearing groove 171, which is conducive to reducing the oil loss at the oil holes 1711 of the motor bearing groove 171. In addition, the oil holes 1711 of the motor bearing groove 171 are distributed on the groove peripheral wall of the motor bearing groove 171, so that after the oil flows through the oil holes 1711 of the motor bearing groove 171, it can flow toward the groove bottom and the groove mouth of the motor bearing groove 171 along the axial direction O of the drive motor 300, which is conducive to prolonging the contact time between the oil and the bearing of the drive motor 300 and enhancing the infiltration effect of the oil on the bearing of the drive motor 300.

[0192] Please continue reading Figure 5 and Figure 6 In one embodiment, the power assembly 10 further includes a coarse filter and a fine filter 700, and the bottom of the reducer groove 110 further includes an oil return hole 117. The oil return hole 117 is used to recover the oil and transport the oil to the coarse filter, and the oil pump 500 is connected to the coarse filter and the fine filter 700 respectively. The coarse filter is used to filter and remove impurities from the oil input into the oil pump 500, and the fine filter 700 is used to filter and remove impurities from the oil input into the first internal flow channel 150a. Among them, the fine filter 700 has a greater filtering capacity for oil than the coarse filter, and the particle size of the impurities filtered by the fine filter 700 is smaller than the particle size of the impurities filtered by the coarse filter.

[0193] The coarse filter, the fine filter 700 and the oil return hole 117 are all distributed on the side of the intermediate shaft 220 and the output shaft 230 away from the electric control tank 140. The coarse filter and the oil return hole 117 are adjacent along the axial direction O of the drive motor 300, and the fine filter 700 and the oil pump 500 are adjacent along the axial direction O of the drive motor 300. The fine filter 700 and the oil pump 500 are both distributed between the intermediate shaft 220 and the output shaft 230. The arrangement direction of the coarse filter and the oil pump 500 intersects with the axial direction O of the drive motor 300.

[0194] In the embodiment of the present application, the coarse filter and the fine filter 700 are used to filter the oil to obtain high-quality oil with a high degree of cleanliness, prevent excessive impurities from entering the reducer slot 110 and the motor slot 130, and ensure the normal operation of the reducer 200 and the drive motor 300.

[0195] In the embodiment of the present application, the reducer groove 110 is used to form an oil storage tank at the bottom away from the electric control groove 140, and the oil return hole 117 is used to guide the oil that falls back to the oil storage tank due to gravity to the coarse filter, which is conducive to the recycling of the oil. The first internal flow channel 150a is distributed inside the groove bottom of the reducer groove 110 and between the intermediate shaft 220 and the input shaft 210, and can be matched with the oil return hole 117, the coarse filter, the oil pump 500 and the fine filter 700 in terms of position layout, which is conducive to reducing the difficulty of the oil flowing from the oil return hole 117 into the first internal flow channel 150a.

[0196] The path of active lubrication of the embodiment of the present application is summarized as follows: In one embodiment, the oil in the oil reservoir flows through the oil return hole 117, the coarse filter, the oil pump 500 and the fine filter 700 in sequence, and flows into the first internal flow channel 150a. Part of the oil in the first internal flow channel 150a flows to the first oil outlet hole 111, and the first oil outlet hole 111 actively lubricates the bearing 231a of the output shaft 230, the bearing 221a of the intermediate shaft 220, and the planetary shaft 620 of the differential case 610 through the first nozzle 270. Part of the oil in the first internal flow channel 150a flows to the second oil outlet hole 115, and the second oil outlet hole 115 actively lubricates the bearing 221b of the intermediate shaft 220, the bearing 231b of the output shaft 230, the meshing portion between the input wheel 240 and the intermediate driven wheel 250a, and the meshing portion between the output wheel 260 and the intermediate driving wheel 250b through the second nozzle 280. Part of the oil in the first internal flow channel 150a flows to the second internal flow channel 150b through the heat exchanger 900. Part of the oil in the second internal flow channel 150b actively lubricates the bearing 211a of the input shaft 210 through the oil hole 1161 of the first input bearing groove 116, and part of the oil in the second internal flow channel 150b actively lubricates the input shaft 210 and the bearing 211b of the input shaft 210 through the third internal flow channel 150c of the reducer end cover 120. Part of the oil in the second internal flow channel 150b actively lubricates the stator 310, the winding 311 and the rotary bearing through the third oil outlet hole 131 of the motor groove 130. Part of the oil in the second internal flow channel 150b flows through the fourth internal flow channel 150d of the motor end cover 170, and actively lubricates the motor shaft 330 bearing through the oil hole 1711 of the motor bearing groove 171. Under the action of gravity, the oil falls back from each bearing groove, the fixing hole 122 or the gear to the oil storage tank of the reducer groove 110, forming a circulation loop for the circulation of the oil.

[0197] In addition to actively lubricating the reducer 200 and the drive motor 300, the embodiment of the present application can also passively lubricate the reducer 200. By combining active lubrication and passive lubrication, the utilization rate of the oil is effectively improved and the risk of insufficient local lubrication of the reducer 200 is reduced.

[0198] Please continue reading Figure 4 and Figure 5In one embodiment, the groove bottom of the reducer groove 110 further includes a first oil guide rib 161b, which is arranged on the side of the output shaft 230 away from the first oil guide rib 161a, and the first oil guide rib 161b is adjacent to the notch 1121b of the groove wall of the first output bearing groove 112. The distance between the first oil guide rib 161b and the first oil outlet hole 111 is greater than the distance between the first oil guide rib 161a and the first oil outlet hole 111. The first oil guide rib 161b is used to transport the oil thrown out by the output wheel 260 and other gears to the notch 1121b of the groove wall of the first output bearing groove 112, and passively lubricate the bearing 231a.

[0199] In the embodiment of the present application, since the first internal flow channel 150a and the first oil outlet hole 111 are both distributed between the intermediate shaft 220 and the output shaft 230, the first oil guide rib 161a is used to receive the oil sprayed by the first nozzle 270, which is beneficial to reduce the difficulty of oil injection and reduce oil loss, and also provides space for arranging the first oil guide rib 161b on the side of the output shaft 230 away from the first oil outlet hole 111.

[0200] Please continue reading Figure 5 and Figure 8 In one embodiment, the groove bottom of the reducer groove 110 further includes a second oil guide rib 162b and a second oil guide rib 162c, and the second oil guide rib 162b and the second oil guide rib 162c are distributed on both sides of the notch 1141 of the first intermediate bearing groove 114 along the circumferential direction C of the intermediate shaft 220. The distance between the second oil guide rib 162b and the second oil guide rib 162c increases along the notch 1141 toward the electric control groove 140.

[0201] In the embodiment of the present application, the second oil guide rib 162a faces the notch 1141, and the second oil guide rib 162b and the second oil guide rib 162c surround the notch 1141. The second oil guide rib 162b and the second oil guide rib 162c are distributed on both sides of the second oil guide rib 162a, so that the second oil guide rib 162b and the second oil guide rib 162c can replenish the collected oil to the bearing 221a in the scenarios of forward and reverse rotation of the reducer 200 or vehicle climbing, which is conducive to improving the efficiency of collecting oil and increasing the amount of oil flowing into the notch 1141.

[0202] In the embodiment of the present application, the space between the second oil guide rib 162b, the second oil guide rib 162c and the second oil guide rib 162a respectively can temporarily store part of the collected oil, or the space between the second oil guide rib 162b and the second oil guide rib 162c can temporarily store part of the collected oil, which is beneficial to reduce the oil stirring loss of the bearing 221a.

[0203] In the embodiment of the present application, the extension direction of the second oil guide rib 162b and the second oil guide rib 162c intersect, and the angle formed by the second oil guide rib 162b and the second oil guide rib 162c opens toward the electric control slot 140 and away from the notch 1141, which is conducive to improving the efficiency of collecting oil. The second oil guide rib 162b and the second oil guide rib 162c can also receive the oil thrown out by the gear in scenes such as the vehicle climbing a large angle, and cooperate with active lubrication to reduce the risk of insufficient lubrication of the bearing 221a in special scenes.

[0204] Please continue reading Figure 4 and Figure 5 In one embodiment, the groove bottom of the reducer groove 110 further includes a fourth oil guide rib 164, and the fourth oil guide rib 164 extends from the electric control groove 140 toward the differential housing 610. The fourth oil guide rib 164 is adjacent to the planetary shaft 620 along the axial direction O of the output shaft 230. The fourth oil guide rib 164 is used to transfer the collected oil to the planetary shaft 620 and the window 611 of the differential housing 610.

[0205] In the embodiment of the present application, the fourth oil guide rib 164 is used to achieve passive lubrication of the differential 600. Both surfaces of the fourth oil guide rib 164 along the circumferential direction C of the output shaft 230 can be used to collect the oil thrown out by the gears, and the oil collected by the fourth oil guide rib 164 flows to the planetary shaft 620 and the window 611 of the differential housing 610 respectively, replenishing the amount of oil that lubricates the planetary shaft 620 and the differential gear set 630.

[0206] Please continue reading Figure 4 and Figure 5 In one embodiment, the groove bottom of the reducer groove 110 further includes a fifth oil guide rib 165a and a fifth oil guide rib 165b, and the fifth oil guide rib 165a and the fifth oil guide rib 165b are distributed on the side of the input shaft 210 away from the second oil guide rib 162b. The extension directions of the fifth oil guide rib 165a and the fifth oil guide rib 165b intersect, and the fifth oil guide rib 165a and the fifth oil guide rib 165b are used to form an oil collecting groove 113b. The notch 1162 of the groove wall of the first input bearing groove 116 faces the oil collecting groove 113b.

[0207] In the embodiment of the present application, the fifth oil guide rib 165a, the fifth oil guide rib 165b and the second oil guide rib 162b are respectively located on both sides of the input shaft 210, and the different oil guide ribs are reasonably arranged to avoid the fifth oil guide rib 165a and the fifth oil guide rib 165b occupying the space of the second oil guide rib 162b. The opening direction of the angle between the fifth oil guide rib 165a and the fifth oil guide rib 165b is toward the notch 1162 of the first input bearing groove 116, and the oil collecting groove 113b formed by the fifth oil guide rib 165a and the fifth oil guide rib 165b is used to collect the oil thrown out by the rotating shaft and the gear, and to guide the oil into the notch 1162 to replenish the oil amount of the lubricating bearing 211a.

[0208] Please continue reading Fig.11 and Fig.12 In one embodiment, the reducer end cover 120 further includes a third oil guide rib 163c, which is distributed between the third oil guide rib 163a and the third oil guide rib 163b, and the third oil guide rib 163c extends from the electric control slot 140 toward the notch 1241 of the second intermediate bearing slot 124. The extension directions of the third oil guide rib 163a, the third oil guide rib 163b and the third oil guide rib 163c intersect. Along the axial direction O of the intermediate shaft 220, the third oil guide rib 163c protrudes toward the intermediate driven wheel 250a relative to the second intermediate bearing slot 124, and along the radial direction R of the intermediate shaft 220, the intermediate driven wheel 250a is distributed between the third oil guide rib 163c and the intermediate shaft 220.

[0209] In the embodiment of the present application, the two surfaces of the third oil guide rib 163c along the circumferential direction C of the intermediate shaft 220 are used to collect oil to passively lubricate the bearing 221b and the intermediate driven wheel 250a. The third oil guide rib 163c faces the notch 1241 of the second intermediate bearing groove 124, and the oil can flow into the notch 1241 under the guidance of the third oil guide rib 163c. The third oil guide rib 163c extends to one side of the intermediate driven wheel 250a along the radial direction R of the intermediate shaft 220, so that the third oil guide rib 163c can transmit the oil thrown out by the gear to the intermediate driven wheel 250a and the intermediate shaft 220, and the intermediate shaft 220 can continue to throw the oil to the second intermediate bearing groove 124. The third oil guide rib 163c can lubricate the intermediate driven wheel 250a while achieving lubrication of the bearing 221b, which is beneficial to reduce the wear of the intermediate driven wheel 250a and the input wheel 240.

[0210] Please continue reading Fig.11 and Fig.12 . In one embodiment, the reducer end cover 120 also includes a sixth oil guide rib 166, which is distributed on the side of the output shaft 230 away from the oil hole 1251a of the second output bearing groove 125, and the sixth oil guide rib 166 is used to transmit the collected oil to the oil hole 1251b of the second output bearing groove 125. In the embodiment of the present application, the sixth oil guide rib 166 is used to cooperate with the oil hole 1251b to achieve passive lubrication of the bearing 231b. Since the output shaft 230 needs to be connected to the wheel transmission, in order to reduce the impact on the structural strength of the second output bearing groove 125 and improve the NVH performance of the powertrain 10, the second output bearing groove 125 guides oil through the oil hole 1251a and the oil hole 1251b.

[0211] Please continue reading Figure 3 and Figure 5In one embodiment, the reducer 200 further includes an oil baffle plate 290, which is distributed on the side of the input shaft 210, the intermediate shaft 220 and the output shaft 230 away from the electric control slot 140, and the oil baffle plate 290 is fixed to the bottom of the reducer slot 110. The oil baffle plate 290 is opposite to the oil return hole 117 along the axial direction O of the intermediate shaft 220. In the embodiment of the present application, the oil baffle plate 290 is arranged adjacent to the oil return hole 117, which can alleviate the situation where the air near the oil return hole 117 is stirred by the gears, reduce the risk of the oil pump 500 sucking in air, and ensure the normal operation of the oil pump 500.

[0212] In one embodiment, one end of the oil baffle plate 290 is distributed on the side of the input wheel 240 away from the electric control slot 140, and the other end of the oil baffle plate 290 is distributed on the side of the output wheel 260 away from the electric control slot 140. The distance between one end of the oil baffle plate 290 and the input wheel 240 along the stacking direction of the electric control slot 140 and the reducer slot 110 is smaller than the distance between the other end of the oil baffle plate 290 and the input wheel 240. One end of the oil baffle plate 290 is used to guide the oil to the input wheel 240. In the embodiment of the present application, at least part of the oil baffle plate 290 is located in the oil reservoir, and the oil thrown out by the gears such as the intermediate driven wheel 250a under the guidance of one end of the oil baffle plate 290 can realize passive lubrication of the input wheel 240, thereby reducing the risk of the input wheel 240 being worn.

[0213] In one embodiment, the oil-blocking boss 291 of the oil-blocking plate 290 is protruded relative to the first intermediate bearing groove 114, and the oil-blocking boss 291 surrounds the side of the intermediate driven wheel 250a away from the electric control groove 140. The oil-blocking boss 291 of the embodiment of the present application can separate part of the oil in the oil reservoir from the intermediate driven wheel 250a, thereby reducing the oil stirring loss of the intermediate driven wheel 250a.

[0214] Please continue reading Fig.11 and Fig.12 . In one embodiment, the reducer end cover 120 also includes an oil retaining rib 126, which protrudes toward the reducer groove 110 relative to the groove wall of the second intermediate bearing groove 124, and the oil retaining rib 126 is distributed on the side of the second input bearing groove 121 away from the electric control groove 140. The oil retaining rib 126 surrounds the intermediate driven wheel 250a. In the embodiment of the present application, the oil retaining rib 126 can block part of the oil flowing out of the second input bearing groove 121 and part of the oil thrown out by the gear, avoiding excessive amount of oil stirred up by the intermediate driven wheel 250a, which is beneficial to reduce the oil stirring loss of the intermediate driven wheel 250a.

[0215] The powertrain and electric vehicle provided in the embodiments of the present application are described in detail above. 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 skilled 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 limiting the present application.

Claims

1. A powertrain, characterized in that: The housing of the power assembly includes a reducer slot, a reducer end cover, a motor slot and an electric control slot, wherein the reducer end cover is used to enclose the notch of the reducer slot, the reducer slot is used to accommodate the input shaft, the intermediate shaft and the output shaft of the reducer in the power assembly, the intermediate shaft is used to drive and connect the input shaft and the output shaft, the notch of the reducer slot and the notch of the motor slot are opposite to each other along the axial direction of the driving motor in the power assembly, and the electric control slot is stacked on the reducer slot and the motor slot; The internal flow channel of the shell includes a first internal flow channel, and the first internal flow channel is used to receive the oil output by the oil pump of the power assembly. The bottom of the reducer groove includes a first oil outlet hole, and the first oil outlet hole is used to transmit the oil in the first internal flow channel through a first nozzle to actively lubricate a bearing of the intermediate shaft and a bearing of the output shaft. The first oil outlet hole is distributed between the intermediate shaft and the output shaft. Along the stacking direction of the electric control groove and the reducer groove, the first oil outlet hole is close to the electric control groove relative to the intermediate shaft and the output shaft.

2. The powertrain according to claim 1, characterized in that: The first internal flow channel is distributed inside the groove bottom of the reducer groove, and the extension direction of the first internal flow channel intersects with the opening direction of the first oil outlet hole.

3. The powertrain according to claim 1 or 2, characterized in that: The oil pump of the power assembly is distributed on a side of the intermediate shaft and the output shaft away from the electronically controlled tank, and the first internal flow channel is distributed between the intermediate shaft and the output shaft.

4. The powertrain according to any one of claims 1 to 3, characterized in that: The groove bottom of the reducer groove includes a first output bearing groove, and the first output bearing groove is used to accommodate the one bearing of the output shaft, wherein: The first oil outlet hole is distributed between the intermediate shaft and the first output bearing groove, the first oil injection port of the first nozzle is used to transmit oil to the notch of the groove wall of the first output bearing groove, and the notch of the groove wall of the first output bearing groove is distributed between the first oil outlet hole and the output shaft.

5. The powertrain according to claim 4, characterized in that: The first output bearing groove is recessed relative to the groove bottom of the motor groove away from the reducer end cover along the axial direction of the output shaft, and the first oil guide rib at the groove bottom of the reducer groove extends from the motor groove toward the notch of the groove wall of the first output bearing groove. Along the stacking direction of the electric control groove and the reducer groove, the first oil guide rib is distributed on the side of the notch of the groove wall of the first output bearing groove away from the first oil outlet.

6. The powertrain according to claim 5, characterized in that: The first oil guiding rib is used to form an oil collecting groove with the groove wall of the first output bearing groove. The recessed direction of the oil collecting groove along the axial direction of the output shaft is away from the reducer end cover. The groove depth of the oil collecting groove along the axial direction of the output shaft is less than the groove depth of the first output bearing groove. The notch of the groove wall of the first output bearing groove faces the oil collecting groove.

7. The power assembly according to any one of claims 1 to 6, characterized in that: The groove bottom of the reducer groove includes a first intermediate bearing groove, the first intermediate bearing groove is used to accommodate the one bearing of the intermediate shaft, the first intermediate bearing groove protrudes toward the reducer end cover relative to the first oil outlet hole along the axial direction of the intermediate shaft, and the first intermediate bearing groove is away from the first oil outlet hole relative to the output shaft, wherein: The first oil spray port of the first nozzle is used to transmit oil to the second oil guide rib at the bottom of the reducer groove, and the second oil guide rib extends from the electronically controlled groove toward the notch in the groove wall of the first intermediate bearing groove, and the notch in the groove wall of the first intermediate bearing groove faces the electronically controlled groove and away from the intermediate shaft.

8. The powertrain according to claim 7, characterized in that: The inner diameter of the notch of the groove wall of the first intermediate bearing groove increases along the direction of the intermediate shaft toward the second oil guide rib.

9. The powertrain according to claim 7 or 8, characterized in that: The intermediate driving wheel of the reducer and the intermediate driven wheel of the reducer are fixed to the intermediate shaft, the first oil outlet hole, the first intermediate bearing groove and the second oil guide rib are distributed on the side of the intermediate driving wheel away from the intermediate driven wheel along the axial direction of the intermediate shaft, and the outer diameter of the intermediate driving wheel is smaller than the outer diameter of the intermediate driven wheel, wherein: Along the axial direction of the intermediate shaft, the second oil guide rib protrudes toward the intermediate driving wheel relative to the first intermediate bearing groove, and along the radial direction of the intermediate shaft, the intermediate driving wheel is distributed between the second oil guide rib and the intermediate shaft, and along the radial direction of the intermediate shaft, the distance between the second oil guide rib and the intermediate driving wheel is smaller than the distance between the center of the first oil outlet hole and the intermediate driving wheel.

10. The power assembly according to any one of claims 1 to 9, characterized in that: The internal flow channel of the housing includes a second internal flow channel, the second internal flow channel is distributed inside the groove wall of at least one of the reducer groove or the motor groove, the inlet of the second internal flow channel is used to receive the oil of the first internal flow channel through the heat exchanger of the powertrain, and the outlet of the second internal flow channel is used to transmit the oil of the first internal flow channel to actively lubricate one bearing of the input shaft and another bearing of the input shaft; The groove bottom of the reducer groove includes a second oil outlet hole, and the second oil outlet hole is used to transmit the oil in the first internal flow channel through a second nozzle to actively lubricate another bearing of the intermediate shaft and another bearing of the output shaft.

11. The powertrain according to claim 10, characterized in that: The groove bottom of the reducer groove comprises a first input bearing groove, the first input bearing groove is used to accommodate the one bearing of the input shaft, the first input bearing groove is recessed toward the motor groove along the axial direction of the input shaft so that the groove bottom of the motor groove forms an annular protrusion; The second internal flow channel is used to transmit oil to the oil holes of the first input bearing groove. The oil holes of the first input bearing groove are distributed on the inner surface of the groove wall of the first input bearing groove. The opening direction of the oil holes of the first input bearing groove along the radial direction of the input shaft is toward the axis of the first input bearing groove.

12. The powertrain according to claim 10 or 11, characterized in that: The reducer end cover comprises a second input bearing groove, a fixing hole and an oil guide protrusion, wherein the second input bearing groove is used to accommodate the other bearing of the input shaft, and the fixing hole is used to fix the blocking member; The second input bearing groove is recessed away from the reducer groove along the axial direction of the input shaft, the fixing hole passes through the bottom of the second input bearing groove, and the oil guide protrusion is distributed on the surface of the reducer end cover away from the reducer groove; The internal flow channel of the housing includes a third internal flow channel, which is distributed inside the oil guide protrusion. The third internal flow channel is used to transmit the oil in the second internal flow channel to the oil holes of the second input bearing groove and the oil holes of the fixing holes. The oil holes of the fixing holes are distributed on the inner surface of the fixing holes. The sealing member, the oil holes of the fixing holes and the shaft cavity of the input shaft are arranged in sequence along the axial direction of the input shaft, and the oil holes of the second input bearing groove are distributed on the bottom of the second input bearing groove.

13. The power assembly according to any one of claims 10 to 12, characterized in that: The reducer end cover comprises a second intermediate bearing groove, the second intermediate bearing groove is used to accommodate the other bearing of the intermediate shaft, the second intermediate bearing groove protrudes toward the intermediate driven wheel of the reducer along the axial direction of the intermediate shaft, and the outer diameter of the intermediate driven wheel is larger than the outer diameter of the second intermediate bearing groove; The two third oil guide ribs of the reducer end cover are distributed on both sides of the notch of the groove wall of the second intermediate bearing groove along the circumference of the intermediate shaft, and the second oil outlet hole is distributed between the electronically controlled groove and the intermediate driven wheel. The second oil outlet hole is used to transmit oil to the gap between the two third oil guide ribs through the second oil injection port of the second nozzle.

14. The powertrain according to claim 13, characterized in that: The reducer end cover includes a second output bearing groove, the second output bearing groove is used to accommodate the other bearing of the output shaft, the second oil outlet hole is used to transmit oil to the oil through hole of the groove wall of the second output bearing groove through the second oil injection port of the second nozzle, one of the third oil guide ribs is arranged on the side of the notch of the groove wall of the second intermediate bearing groove facing the output shaft, and the oil through holes of the groove wall of the second output bearing groove are distributed between the output shaft and the one of the third oil guide ribs.

15. An electric vehicle, characterized in that: The electric vehicle comprises a power battery and a powertrain as described in any one of claims 1 to 14, wherein the powertrain is used to receive power from the power battery and to drive wheels of the electric vehicle.

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