Power assembly with bearing lubricating structure and vehicle

Abstract

The invention provides a power assembly with a bearing lubricating structure and a vehicle, a shell of the power assembly comprises a partition plate, a motor groove and a speed reducer groove, and the motor groove and the speed reducer groove are arranged on the two sides of the partition plate in the axial direction of a driving motor in the power assembly. The partition plate comprises a bearing chamber, and the bearing chamber is used for fixing a motor shaft bearing of the driving motor or an input shaft bearing of a speed reducer in the power assembly. The internal flow channel of the shell comprises an axial internal flow channel and a partition plate internal flow channel. One end of the axial internal flow channel is used for receiving oil output by an oil pump of the power assembly. The other end of the axial internal flow channel is used for communicating with one end of the partition plate internal flow channel. And the other end of the flow channel in the partition plate is used for conveying oil to the bearing chamber so as to actively lubricate a bearing fixed by one bearing chamber. The lubricating effect on the bearing can be enhanced, and normal operation of a power assembly is ensured.

Description

Technical Field

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

[0002] In the new energy vehicle industry, the powertrain is the main power source of the vehicle. Among them, the reducer, as an important part of the powertrain, can use the internal gear assembly to convert the kinetic energy of high speed into greater torque output to meet the needs of the vehicle during driving. However, there is currently a problem of insufficient lubrication of bearings and other components in the gear assembly, which may cause serious wear of the gear assembly, reduce the service life of the reducer, and have a negative impact on the normal operation of the powertrain. Summary of the invention

[0003] Embodiments of the present application provide a powertrain and a vehicle having a bearing lubrication structure.

[0004] In a first aspect, an embodiment of the present application provides a powertrain, wherein the housing of the powertrain includes a partition, a motor slot and a reducer slot, wherein the motor slot and the reducer slot are arranged on both sides of a partition along the axial direction of the drive motor in the powertrain. A partition includes a bearing chamber, and a bearing chamber is used to fix the motor shaft bearing of the drive motor or the input shaft bearing of the reducer in the powertrain. The internal flow channel of the housing includes an axial internal flow channel and a partition internal flow channel.

[0005] One end of an axial internal flow channel is used to receive the oil output by the oil pump of the power assembly. The other end of an axial internal flow channel is used to communicate with one end of a partition internal flow channel. The other end of a partition internal flow channel is used to transport oil to a bearing chamber to actively lubricate a motor shaft bearing or an input shaft bearing fixed by a bearing chamber.

[0006] In the embodiment of the present application, the partition is used to separate the housing of the powertrain into a reducer slot and a motor slot, wherein two side surfaces of the partition along the axial direction of the drive motor respectively constitute the slot bottom of the reducer slot and the slot bottom of the motor slot.

[0007] Since the rotation speed of the motor shaft and the input shaft is usually high, the motor shaft drives the motor shaft bearing to rotate at high speed, and the input shaft drives the input shaft bearing to rotate at high speed. It is necessary to ensure that the motor shaft bearing or the input shaft bearing is adequately lubricated to extend the service life of the motor shaft bearing or the input shaft bearing and improve the safety performance of the powertrain and the vehicle. However, the current lubrication method for the motor shaft bearing or the input shaft bearing usually adopts passive lubrication, which collects the lubricating oil thrown out by the rotating parts such as the rotor of the drive motor or the gears of the reducer, or the oil leaked from certain structures, and then introduces the collected lubricating oil into a bearing chamber. 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 movement of the oil will lack sufficient power, and if the temperature of the oil is too low, the oil viscosity will be high, which will have a negative impact on the collection of the oil and is not conducive to improving the lubrication efficiency.

[0008] In order to avoid the defects of passive lubrication, some existing technologies use oil guides to actively lubricate the motor shaft bearings or input shaft bearings. The oil guides are a structure that is separate from the housing of the powertrain. The assembly process cost between the oil guide and the housing is high, which is not conducive to improving the overall structural stability of the powertrain. The oil guide located in the housing also needs to consider how to avoid interference with the drive motor or reducer, otherwise it will have an adverse effect on the normal operation of the drive motor or reducer.

[0009] In an embodiment of the present application, the axial internal flow channel and the internal flow channel of the partition for realizing active lubrication are both located inside the shell. Specifically, the axial internal flow channel and the internal flow channel of the partition are structures integrally formed with the shell, and have strong structural stability, which is conducive to streamlining the assembly process and reducing processing costs. The axial internal flow channel and the internal flow channel of the partition are both located inside the shell to avoid interference from the drive motor or the reducer, which is conducive to ensuring that the axial internal flow channel and the internal flow channel of the partition stably transport oil to the bearing chamber, and can also cool the motor shaft bearing or the input shaft bearing while improving the lubrication efficiency. In addition, the axial internal flow channel and the internal flow channel of the partition do not occupy the accommodation space of the motor slot or the reducer slot, which makes the layout of the drive motor or the reducer more flexible, and is conducive to realizing the miniaturized design of the powertrain.

[0010] In the embodiment of the present application, one end of the axial internal flow channel is used to receive the oil transmitted by the oil pump. Driven by the oil pump, the oil is not easily affected by the rotation speed and oil temperature of the rotating parts during the process of moving from the other end of the axial internal flow channel to the bearing chamber, which is conducive to the advantages of active lubrication. One end and the other end of the internal flow channel of the partition are respectively used to connect the axial internal flow channel and the bearing chamber. With the cooperation of the internal flow channel of the partition, the extension direction and connection relationship of the axial internal flow channel can be more flexible according to actual needs, which is convenient for the oil circuit design of the powertrain, and is conducive to the lubrication of other parts of the powertrain, and expands the coverage of the oil in the powertrain.

[0011] In one embodiment, an axial internal flow channel is distributed inside at least one of the slot walls of a motor slot or a reducer slot, a partition internal flow channel is distributed inside a partition, and an extension direction of a partition internal flow channel intersects with an extension direction of an axial internal flow channel.

[0012] In the embodiment of the present application, the extension direction of the internal flow channel of the partition is not parallel to the extension direction of the axial internal flow channel. The internal flow channel of the partition can change the flow direction of the oil so that the path of the axial internal flow channel does not have to point directly to a bearing chamber, and the internal flow channel of the partition can be used as a tributary.

[0013] In the embodiment of the present application, taking the axial internal flow channel located inside the groove wall of the reducer groove as an example, the position of the partition internal flow channel inside the shell is different from that of the axial internal flow channel. The partition internal flow channel is distributed inside the partition, does not occupy the internal space of the groove wall of the reducer groove, and can avoid squeezing the accommodation space of the reducer groove due to the excessive thickness of the groove wall of the reducer groove.

[0014] In the embodiment of the present application, when the axial internal flow channel is distributed in the groove wall of the motor groove and the groove wall of the reducer groove, the oil in the axial internal flow channel can not only lubricate the motor shaft bearing or the input shaft bearing accommodated in a bearing chamber, but also cool and lubricate other components of the drive motor and the reducer, which is beneficial to improving the utilization rate of the oil.

[0015] In one embodiment, an extension direction of an axial internal flow channel is parallel to the axial direction of the drive motor, and an extension direction of an internal flow channel of the partition is perpendicular to the axial direction of the drive motor.

[0016] In the embodiment of the present application, the extension direction of the axial internal flow channel is parallel to the arrangement direction of the motor slot and the reducer slot and the opening direction of the motor slot and the reducer slot, which is conducive to reducing the processing difficulty of the axial internal flow channel. In the internal flow channel of the shell, the oil flows from one end of the axial internal flow channel to the other end of the internal flow channel of the partition. When the starting point and the end point have been determined, the extension direction of the internal flow channel of the partition is perpendicular to the extension direction of the axial internal flow channel, which is conducive to shortening the movement path of the oil.

[0017] In one embodiment, the inner diameter of the other end of an axial inner flow channel is greater than the inner diameter of one end of a partition inner flow channel.

[0018] In an embodiment of the present application, the other end of the axial internal flow channel is connected to one end of the internal flow channel of the partition. The inner diameter of the other end of the axial internal flow channel is larger than the inner diameter of one end of the internal flow channel of the partition. Reasonable distribution of the flow rate of oil flowing to a bearing chamber can avoid too much oil from entering a bearing chamber, which is beneficial to reduce the oil stirring loss of the motor shaft bearing or the input shaft bearing. The internal flow channel of the partition plays a throttling role, so that most of the remaining oil in the axial internal flow channel can also flow to other components of the drive motor or reducer, which is beneficial to improve the lubrication and cooling effect of the powertrain as a whole.

[0019] In one embodiment, the surface of a partition includes a guide groove, one end of the guide groove is used to receive oil output from the other end of an internal flow channel of the partition, and the other end of the guide groove is used to transport oil to a bearing chamber.

[0020] In the embodiment of the present application, after the oil flows out from the internal flow channel of the partition, it moves to the guide groove on the surface of the partition, and the two ends of the guide groove are used to connect the internal flow channel of the partition and a bearing chamber respectively. The axial internal flow channel, the internal flow channel of the partition and the guide groove are all integrated into the housing of the powertrain, which is conducive to improving the structural strength of the flow channel for transmitting oil and can also reduce the number of structural parts of the powertrain.

[0021] In one embodiment, a bearing chamber and a guide groove are distributed on a side of a partition plate along the axial direction of the drive motor facing the reducer groove, and the concave directions of a bearing chamber and a guide groove face a motor groove.

[0022] In an embodiment of the present application, a bearing chamber is located on the side of the partition facing the reducer groove, and a bearing chamber and a guide groove are adjacent to the gear shaft assembly of the reducer. In order to cooperate with a bearing chamber, the axial internal flow channel is located inside the groove wall of the reducer groove, or the axial internal flow channel is located inside the groove wall of the reducer groove and inside the groove wall of the motor groove. A bearing chamber and a guide groove are formed on the same side of the partition, and oil can enter a bearing chamber from the opening of a bearing chamber, which can increase the contact area between the oil and the motor shaft bearing or the input shaft bearing, and is also conducive to reducing the difficulty of processing a bearing chamber and a guide groove.

[0023] In one embodiment, the surface of a partition includes two oil-collecting protrusions spaced apart from each other, and the two oil-collecting protrusions are distributed on both sides of a notch of a guide groove. The two oil-collecting protrusions protrude from the surface of a partition. The length of each of the two oil-collecting protrusions is less than the length of a guide groove. The length of one of the two oil-collecting protrusions is less than the length of the other oil-collecting protrusion, and the distance between one of the two oil-collecting protrusions and a bearing chamber is greater than the distance between the other oil-collecting protrusion and a bearing chamber.

[0024] In an embodiment of the present application, one oil collecting protrusion, another oil collecting protrusion and a guide groove are formed on the same surface of the partition, that is, one oil collecting protrusion, another oil collecting protrusion and the guide groove are all distributed on the side of the partition facing the motor slot, or one oil collecting protrusion, another oil collecting protrusion and the guide groove are all distributed on the side of the partition facing the reducer slot.

[0025] Under the vibration of the rotating parts of the powertrain, part of the oil in the guide groove may leak out from the notch of the guide groove before flowing into a bearing chamber. In an embodiment of the present application, one oil collecting protrusion and another oil collecting protrusion are arranged on both sides of the notch of the guide groove, which is equivalent to extending the groove wall of the guide groove, and can also increase the space for transmitting oil, which is conducive to reducing oil loss. The length of one oil collecting protrusion and another oil collecting protrusion is less than the length of the guide groove, and one oil collecting protrusion and another oil collecting protrusion are both separated from a bearing chamber, so that the other end of the guide groove can play a major guiding role for the oil, which is convenient for the oil to flow from the guide groove into a bearing chamber. The length of one oil collecting protrusion is less than the length of another oil collecting protrusion, and the interval between one oil collecting protrusion and a bearing chamber is greater than the interval between another oil collecting protrusion and a bearing chamber, which is convenient for arranging other structures between a bearing chamber and an oil collecting protrusion to save space.

[0026] In an embodiment of the present application, one oil-collecting protrusion and another oil-collecting protrusion can also play a role of passive lubrication by themselves to supplement the effect of active lubrication. Specifically, one oil-collecting protrusion and another oil-collecting protrusion protrude from the surface of the partition, and when the guide groove faces the reducer groove, one oil-collecting protrusion and another oil-collecting protrusion can be used to collect the oil thrown out from the input wheel or the intermediate wheel of the gear shaft assembly. When the guide groove faces the motor groove, one oil-collecting protrusion and another oil-collecting protrusion can be used to collect the oil thrown out from the rotor of the drive motor. The oil collected by the two oil-collecting protrusions then flows to the guide groove and a bearing chamber in turn, thereby improving the utilization rate of the oil. The embodiment of the present application combines active lubrication and passive lubrication, which is beneficial to increase the amount of oil used to lubricate the motor shaft bearings or the input shaft bearings, and enhance the lubrication effect on the motor shaft bearings or the input shaft bearings.

[0027] In one embodiment, two oil collecting protrusions are distributed on the side of a partition facing a reducer groove, the two oil collecting protrusions protrude from the surface of a partition in a direction away from a motor groove, and one of the two oil collecting protrusions is arranged on one side of the other oil collecting protrusion along the circumference of the drive motor.

[0028] The height of one oil collecting protrusion protruding from the surface of one partition plate is less than the height of another oil collecting protrusion protruding from the surface of one partition plate.

[0029] In an embodiment of the present application, one oil collecting protrusion and another oil collecting protrusion are located on the side of the partition facing the reducer groove, and the two oil collecting protrusions are arranged along the circumference of the drive motor, so that in the two different conditions of forward rotation and reverse rotation of the gear shaft assembly, one oil collecting protrusion and the other oil collecting protrusion along the two surfaces of the circumference of the drive motor can collect oil, thereby reducing the difficulty of oil collection of the two oil collecting protrusions in different conditions.

[0030] In the embodiment of the present application, since the other oil collecting protrusion is closer to the bearing chamber than the one oil collecting protrusion, the height of the other oil collecting protrusion relative to the partition surface is greater than the height of the one oil collecting protrusion relative to the partition surface, the other oil collecting protrusion can collect relatively more oil and transport relatively more oil to a relatively closer bearing chamber, which is beneficial to reduce oil loss.

[0031] In one embodiment, the surface of a partition also includes a mounting groove, a groove wall of a mounting groove surrounds a bearing chamber, a mounting groove is used to install an annular bearing cover plate, and an annular bearing cover plate is used to enclose a portion of a guide groove and a portion of a bearing chamber.

[0032] In the embodiment of the present application, the mounting groove and the annular mounting cover plate are both annular. The bearing contained in a bearing chamber has a high rotation speed, and the annular bearing cover plate encloses a part of a bearing chamber, which is conducive to reducing the axial movement of the bearing and avoiding powertrain operation failure.

[0033] In an embodiment of the present application, the groove wall of the mounting groove is located on the outer peripheral side of a bearing chamber, so that the annular bearing cover plate can also cover a portion of the guide groove. The annular bearing cover plate can prevent the oil transmitted between the guide groove and a bearing chamber from leaking, thereby playing the role of oil barrier, which is beneficial to reducing oil loss and realizing the reuse of the annular bearing cover plate.

[0034] In one embodiment, a bearing chamber includes two sections of liquid storage tanks, one section of the two sections of liquid storage tanks is distributed on the inner circumferential wall of a bearing chamber, the other section of the two sections of liquid storage tanks is distributed on the bottom wall of a bearing chamber, and the other section of the liquid storage tank is connected to a guide groove through one section of the liquid storage tank.

[0035] The slot opening of one section of the liquid storage tank is oriented along the radial direction of a bearing chamber toward the axis of a bearing chamber, and the slot opening of another section of the liquid storage tank is oriented along the axial direction of a bearing chamber away from a motor slot.

[0036] In the embodiment of the present application, the guide groove, one section of the liquid storage groove and another section of the liquid storage groove are arranged in sequence along the axial direction of one bearing chamber, and the oil in the guide groove flows to the one section of the liquid storage groove and the other section of the liquid storage groove in sequence. The axial direction of one bearing chamber is parallel to the axial direction of the drive motor, and the radial direction of one bearing chamber is parallel to the radial direction of the drive motor.

[0037] In an embodiment of the present application, one section of the liquid reservoir is distributed on the inner circumferential wall of a bearing chamber, and another section of the liquid reservoir is distributed on the bottom wall of a bearing chamber. One section of the liquid reservoir and another section of the liquid reservoir are both spaced apart from the motor shaft bearing or the input shaft bearing, and one section of the liquid reservoir and another section of the liquid reservoir can guide the inflowing oil to lubricate different surfaces of the motor shaft bearing or the input shaft bearing, which is beneficial to increase the contact area between the oil and the motor shaft bearing or the input shaft bearing. One section of the liquid reservoir and another section of the liquid reservoir can also play the role of storing oil, so that the oil can have an infiltration effect on part of the surface of the motor shaft bearing or the input shaft bearing.

[0038] In one embodiment, the other end of a guide groove is recessed toward a section of the liquid storage tank along the axial direction of the drive motor, and the distance between the other end of a guide groove and a section of the liquid storage tank along the axial direction of the drive motor is smaller than the distance between one end of a guide groove and a section of the liquid storage tank.

[0039] In an embodiment of the present application, the other end of the guide groove is connected to a section of a liquid reservoir in a bearing chamber. Since the annular bearing cover plate needs to enclose a portion of the other end of the guide groove, there needs to be a gap between the other end of the guide groove and the annular bearing cover plate along the axis of the drive motor, otherwise it will cause the oil in the guide groove to be difficult to flow into a bearing chamber. The other end of the guide groove is recessed toward a section of the liquid reservoir, and the other end of the guide groove along the axis of the drive motor is closer to the liquid reservoir than one end of the guide groove, which is beneficial to reduce the flow resistance of the oil. The internal flow channel of the partition is close to the groove wall of the reducer groove, and the distance between one end of the guide groove and a section of the liquid reservoir along the axis of the drive motor is greater than the distance between the other end of the guide groove and a section of the liquid reservoir, which is equivalent to one end of the guide groove being closer to the groove wall of the reducer groove than the other end of the guide groove, so that one end of the guide groove can receive the oil transmitted by the internal flow channel of the partition.

[0040] In one embodiment, a bearing chamber is recessed toward a motor slot along the axial direction of the drive motor so that a partition forms an annular protrusion toward the side of a motor slot, and an annular protrusion is embedded in the motor slot along the axial direction of the drive motor. A partition also includes an axial hole.

[0041] Among them, an axial hole penetrates the bottom wall of a bearing chamber and an annular protrusion along the axial direction of the driving motor, and one of the motor shaft of the driving motor or the input shaft of the reducer passes through an axial hole to transmission connect to the other of the motor shaft of the driving motor or the input shaft of the reducer.

[0042] In the embodiment of the present application, the axial hole of the partition plate passes through the bottom wall of a bearing chamber and the annular protrusion along the axial direction of the drive motor, so that the oil flowing into the bearing chamber can flow into the motor slot through the axial hole, lubricate and cool the drive motor accommodated in the motor slot, and improve the utilization rate of the oil. The annular protrusion is embedded in the motor slot, which can shorten the axial distance between the axial hole and the drive motor and reduce the difficulty of the oil flowing into the motor slot.

[0043] In the embodiment of the present application, a bearing chamber is recessed toward the motor slot along the axial direction of the drive motor, and the projection of a bearing chamber along the radial direction of the drive motor partially overlaps with the projection of the slot wall of the motor slot, which is equivalent to borrowing part of the space in the motor slot to form a bearing chamber, which is beneficial to reducing the overall axial length of the powertrain. In this case, the guide groove and the two oil collecting protrusions are equivalent to the depression or protrusion of the plane where the opening of a bearing chamber is located, which is beneficial to reduce the processing difficulty and cost of the guide groove and the two oil collecting protrusions, and reduce the resistance of the oil in the transmission path.

[0044] If a bearing chamber is axially away from the motor slot protrusion along the drive motor, and the guide groove and the two oil collecting protrusions are distributed on the side of the partition facing the reducer slot, in this case, in order to enable the two oil collecting protrusions to collect oil, the axial length of the two oil collecting protrusions must be greater than the axial length of the inner circumferential wall of the bearing chamber. In the embodiment of the present application, when a bearing chamber is embedded in the motor slot, the height of the two oil collecting protrusions protruding from the surface of the partition can be small, which will not affect the oil collecting effect of the oil collecting protrusions, and can also reduce the cost of the two oil collecting protrusions, and avoid the two oil collecting protrusions from interfering with other devices in the powertrain, thereby optimizing the layout in the powertrain.

[0045] In one embodiment, an annular protrusion is embedded into the inner cavity of the end winding of the drive motor along the axial direction of the drive motor.

[0046] In an embodiment of the present application, the stator of the drive motor includes a plurality of winding slots arranged in sequence along the circumference of the drive motor, and the plurality of winding slots are used to accommodate the windings of the drive motor. Among them, the ends of the windings of the drive motor are exposed from the winding slots of the stator, and the ends of the windings of the drive motor are called end windings. During the operation of the power assembly, the resistance generated by the current flowing through the end windings will cause energy loss, and the lost energy will gradually be converted into heat, causing the temperature of the end windings to continue to rise. In an embodiment of the present application, the annular protrusion is embedded in the inner cavity of the end winding, so that the oil in a bearing chamber can cool the end winding through the shaft hole, which is beneficial to reduce the heat loss of the end winding and improve the working efficiency of the drive motor.

[0047] In the embodiment of the present application, the space of the motor slot used by a bearing chamber and an annular protrusion specifically refers to the inner cavity of the end winding facing the partition. It can be understood that the end winding is annular, and the inner cavity of the end winding is the space usually possessed by the current drive motor. In the embodiment of the present application, the inner cavity of the end winding is used to accommodate the annular protrusion and a bearing chamber, which can not only reduce the processing difficulty of the flow channel structure used to transmit oil, reduce the flow resistance of the oil, but also shorten the axial length of the powertrain.

[0048] In one embodiment, a partition includes another bearing chamber for fixing the intermediate shaft bearing of the reducer. The distance between the other end of an axial inner flow passage and the axis of one bearing chamber is smaller than the distance between the other end of an axial inner flow passage and the axis of another bearing chamber.

[0049] In the embodiment of the present application, for the convenience of expression, the other bearing chamber is recorded as another bearing chamber. The intermediate shaft bearing fixed in the other bearing chamber is used to drive the intermediate shaft of the gear shaft assembly, and the intermediate shaft is connected to the intermediate wheel in driving connection. The axial internal flow channel is used as the starting point of the bearing lubrication structure, and one bearing chamber is used as the end point of the bearing lubrication oil circuit. The axis of one bearing chamber is closer to the other end of the axial internal flow channel than the axis of the other bearing chamber, which is equivalent to shortening the distance between the starting point and the end point of the bearing lubrication oil circuit, which is beneficial to reduce the loss of oil in the transmission path and improve the efficiency of oil guide. The distance between the other end of the axial internal flow channel and the axis of one bearing chamber is relatively small, which also makes the axial internal flow channel, the partition internal flow channel, the guide groove and the two oil collecting protrusions compactly arranged, which is conducive to realizing the miniaturized design of the powertrain.

[0050] In a second aspect, an embodiment of the present application provides a vehicle, comprising a frame, a battery pack, and a powertrain as described in any embodiment of the first aspect, wherein the frame is used to fix the battery pack and the powertrain, the battery pack is used to supply power to a drive motor through the powertrain, and the powertrain is used to drive the wheels of the vehicle through the drive motor and a reducer.

[0051] In the embodiments of the present application, the powertrain described in any one of the embodiments of the first aspect is applied to a vehicle. Since the lubrication effect on the bearings is enhanced, failure of the motor shaft bearings or the input shaft bearings can be avoided, which is beneficial to improving the safety performance of the powertrain and ensuring smooth and safe driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 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.

[0053] Figure 1 is a schematic diagram of a vehicle provided in an embodiment of the present application;

[0054] Figure 2 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0055] Figure 3 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0056] Figure 4 is a partial cross-sectional view of a powertrain provided in an embodiment of the present application;

[0057] Figure 5 yes Figure 4 A partial enlarged view of the M part of the powertrain shown;

[0058] Figure 6 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0059] Figure 7 It is a schematic diagram of a powertrain provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] 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.

[0061] For ease of understanding, the relevant technical terms involved in the embodiments of the present application are explained and described below.

[0062] 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.

[0063] 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.

[0064] At present, the bearings of the powertrain have the problem of poor lubrication effect. An embodiment of the present application provides a powertrain, wherein the housing of the powertrain includes a partition, a motor slot and a reducer slot, wherein the motor slot and the reducer slot are arranged on both sides of a partition along the axial direction of the drive motor in the powertrain. The powertrain includes a drive motor and a reducer, and the drive motor is connected to the reducer in a transmission manner. A motor slot is used to accommodate the motor shaft, stator and rotor of the drive motor, and a reducer slot is used to accommodate the gear shaft assembly of the reducer. A partition includes a bearing chamber, and a bearing chamber is used to fix the motor shaft bearing of the drive motor or the input shaft bearing of the reducer in the powertrain. The motor shaft bearing is used for transmission connection to the motor shaft, the input shaft bearing is used for transmission connection to the input shaft of the gear shaft assembly, and the motor shaft is used for transmission connection to the input shaft.

[0065] The internal flow channel of the housing includes an axial internal flow channel and a partition internal flow channel. One end of the axial internal flow channel is used to receive the oil output by the oil pump of the power assembly. The other end of the axial internal flow channel is used to communicate with one end of a partition internal flow channel. The other end of the partition internal flow channel is used to transport oil to a bearing chamber to actively lubricate a motor shaft bearing or an input shaft bearing fixed by a bearing chamber.

[0066] The embodiment of the present application utilizes the internal flow channel of the housing to realize active lubrication of the bearing of the powertrain, which can enhance the lubrication effect on the bearing. The powertrain provided by the embodiment of the present application can be applied to vehicles.

[0067] See also Figure 1 , Figure 1 A schematic diagram of a vehicle 1 provided in an embodiment of the present application. In the embodiment of the present application, vehicle 1 refers to a wheeled device driven or towed by a power device. In the embodiment of the present application, vehicle 1 includes a frame 20, a battery pack 30 and a powertrain 10. Among them, the frame 20 is the structural skeleton of the vehicle 1, and the frame 20 is used to install the battery pack 30 and the powertrain 10, and can bear the internal and external environmental loads of the vehicle 1. The battery pack 30 is used to supply power to the powertrain 10, and the battery pack 30 can also be called a power battery. The powertrain 10 is the power source of the vehicle 1, and the powertrain 10 is used to drive the wheels 40 of the vehicle 1.

[0068] See also Figure 2 , Figure 2 This is a schematic diagram of a powertrain 10 provided in an embodiment of the present application. It should be noted that: Figure 2The internal components of the powertrain 10 are only schematically shown, and do not represent the specific shapes, sizes and positional relationships of the internal components. For the purpose of simplicity, the connections between certain components are hidden.

[0069] In an embodiment of the present application, the powertrain 10 includes a reducer 300, a motor controller 400 and a drive motor 200, the reducer 300 includes a gear assembly, and the drive motor 200 includes a motor shaft 210, a stator 220, a rotor and a winding 230. The motor controller 400 is used to convert the direct current provided by the battery pack into alternating current, and transmit the alternating current to the winding 230. The rotating magnetic field generated by the winding 230 after receiving the alternating current interacts with the permanent magnet on the rotor. The action of the electromagnetic field causes the rotor to rotate, thereby driving the motor shaft 210 to rotate. The motor shaft 210 is transmission-connected to the gear assembly of the reducer 300 to drive the wheels to rotate, and the gear assembly can change the transmission ratio between the drive motor 200 and the wheels.

[0070] During the operation of the powertrain, due to the high speed and heavy load of the powertrain bearings, one of the key factors to improve the reliability of the bearings 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.

[0071] The embodiments of the present application improve the lubrication method of the bearings of the powertrain, thereby improving the lubrication efficiency of the bearings and ensuring the normal operation of the powertrain.

[0072] See also Figures 3 to 5 . Figure 3 A schematic diagram of a powertrain 10 provided in an embodiment of the present application, Figure 4 A partial cross-sectional view of a powertrain 10 provided in an embodiment of the present application, Figure 5 for Figure 4 A partial enlarged view of the M portion of the powertrain 10 is shown.

[0073] In one embodiment, if Figure 3 As shown, the housing 100 of the power assembly 10 includes a partition 110, a motor slot 120 and a reducer slot 130, and the motor slot 120 and the reducer slot 130 are arranged on both sides of the partition 110 along the axial direction O of the driving motor 200 in the power assembly 10. Figures 3 to 5 As shown, the partition 110 includes a bearing chamber 111 , and the bearing chamber 111 is used to fix the motor shaft bearing 240 of the drive motor 200 or the input shaft bearing 310 of the reducer 300 in the power assembly 10 .

[0074] like Figure 4 and Figure 5As shown, the internal flow channel 140 of the housing 100 includes an axial internal flow channel 141 and a partition internal flow channel 142. Among them, one end 1411 of the axial internal flow channel 141 is used to receive the oil output by the oil pump of the power assembly 10. The other end 1412 of the axial internal flow channel 141 is used to communicate with one end 1421 of the partition internal flow channel 142. The other end 1422 of the partition internal flow channel 142 is used to transport oil to a bearing chamber 111 to actively lubricate a motor shaft bearing 240 or an input shaft bearing 310 fixed to the bearing chamber 111.

[0075] In the embodiment of the present application, the partition 110 is used to separate the housing 100 of the power assembly 10 into a reducer slot 130 and a motor slot 120. The two side surfaces of the partition 110 along the axial direction O of the drive motor 200 respectively constitute the bottom of the reducer slot 130 and the bottom of the motor slot 120. In one embodiment, the partition 110, the reducer slot 130, and the motor slot 120 are integrally die-cast, which is conducive to improving the structural strength of the housing 100 of the power assembly 10.

[0076] In the embodiment of the present application, for ease of description, a bearing chamber 111 of the partition 110 is recorded as a bearing chamber 111a, and the bearing 500 accommodated in the bearing chamber 111a is recorded as a bearing 500a. That is, the bearing 500a is a motor shaft bearing 240 or an input shaft bearing 310. The gear shaft assembly of the reducer 300 generally includes a bearing, a rotating shaft and a gear, and the input shaft bearing 310 is one of the bearings of the gear shaft assembly. In one embodiment, the bearing chamber 111a is used to fix the outer ring of the bearing 500a. Among them, the inner ring of the motor shaft bearing 240 rotates with the motor shaft 210 of the motor, and the inner ring of the input shaft bearing 310 rotates with the input shaft 320 of the reducer 300. The motor shaft 210 is used to transmit mechanical energy to the input shaft 320, driving the input shaft 320 to rotate.

[0077] Since the rotation speed of the motor shaft 210 and the input shaft 320 is usually high, the motor shaft 210 drives the motor shaft bearing 240 to rotate at a high speed, and the input shaft 320 drives the input shaft bearing 310 to rotate at a high speed. It is necessary to ensure that the bearing 500a is adequately lubricated to extend the service life of the bearing 500a and improve the safety performance of the power assembly 10 and the vehicle. However, the current lubrication method for the bearing 500a usually adopts passive lubrication, which collects the lubricating oil thrown out by the rotating parts such as the rotor of the drive motor 200 or the gears of the reducer 300, or the oil leaked from certain structures, and then introduces the collected lubricating oil into the bearing chamber 111a. 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 movement of the oil will lack sufficient power, and if the temperature of the oil is too low, the oil viscosity will be relatively high, which will have a negative impact on the collection of the oil and is not conducive to improving the lubrication efficiency.

[0078] In order to avoid the defects of passive lubrication, some prior arts use an oil guide to actively lubricate the bearing 500a, and the oil guide is a structure separate from the housing 100 of the power assembly 10. The assembly process cost between the oil guide and the housing 100 is high, which is not conducive to improving the overall structural stability of the power assembly 10. The oil guide located in the housing 100 also needs to consider how to avoid interference with the drive motor 200 or the reducer 300, otherwise it will have an adverse effect on the normal operation of the drive motor 200 or the reducer 300.

[0079] In the embodiment of the present application, the axial internal flow channel 141 and the partition internal flow channel 142 for realizing active lubrication are both located inside the housing 100. Specifically, the axial internal flow channel 141 and the partition internal flow channel 142 are structures integrally formed with the housing 100, and the structural stability is strong, which is conducive to streamlining the assembly process and reducing the processing cost. The axial internal flow channel 141 and the partition internal flow channel 142 are both located inside the housing 100, which can also avoid being interfered by the drive motor 200 or the reducer 300, which is conducive to ensuring that the axial internal flow channel 141 and the partition internal flow channel 142 stably transport oil to the bearing chamber 111a, and can also cool the bearing 500a while improving the lubrication efficiency. In addition, the axial internal flow channel 141 and the partition internal flow channel 142 do not occupy the accommodation space of the motor slot 120 or the reducer slot 130, so that the layout of the drive motor 200 or the reducer 300 is more flexible, which is conducive to realizing the miniaturization design of the powertrain 10. In one embodiment, the oil may be any one of glycol cooling oil, synthetic oil and mineral oil.

[0080] In the embodiment of the present application, one end 1411 of the axial internal flow channel 141 is used to receive the oil transmitted by the oil pump. Driven by the oil pump, the oil is not easily affected by the rotation speed and oil temperature of the rotating parts during the process of moving from the other end 1412 of the axial internal flow channel 141 to the bearing chamber 111a, which is conducive to the advantages of active lubrication. One end 1421 and the other end 1422 of the partition internal flow channel 142 are used to connect the axial internal flow channel 141 and the bearing chamber 111a respectively. In one embodiment, the partition internal flow channel 142 is also connected to other flow channels of the powertrain 10. In this case, the partition internal flow channel 142 can also play a role in controlling the oil flow rate and diverting the oil in the axial internal flow channel 141. With the cooperation of the internal flow channel 142 of the partition, the extension direction and connection relationship of the axial internal flow channel 141 can become more flexible according to actual needs, which is convenient for the oil circuit design of the power assembly 10, conducive to the lubrication of other components of the power assembly 10, and expands the coverage of the oil in the power assembly 10.

[0081] Please continue reading Figures 3 to 5In one embodiment, the axial internal flow channel 141 is distributed inside at least one of the slot walls of the motor slot 120 or the reducer slot 130 , the partition internal flow channel 142 is distributed inside the partition 110 , and the extension direction of the partition internal flow channel 142 intersects with the extension direction of the axial internal flow channel 141 .

[0082] In the embodiment of the present application, the extension direction of the partition inner flow channel 142 is not parallel to the extension direction of the axial inner flow channel 141. The partition inner flow channel 142 can change the flow direction of the oil, so that the path of the axial inner flow channel 141 does not need to be directly directed to the bearing chamber 111a, and the partition inner flow channel 142 can be used as a branch. Exemplarily, the oil in the axial inner flow channel 141 can flow between the reducer slot 130 and the motor slot 120, which is conducive to expanding the coverage of the oil and enhancing the lubrication effect on the power assembly 10.

[0083] In the embodiment of the present application, taking the axial internal flow channel 141 being located inside the groove wall of the reducer groove 130 as an example, the position of the partition internal flow channel 142 inside the housing 100 is different from that of the axial internal flow channel 141. The partition internal flow channel 142 is distributed inside the partition 110, does not occupy the internal space of the groove wall of the reducer groove 130, and can avoid squeezing the accommodation space of the reducer groove 130 due to the excessive thickness of the groove wall of the reducer groove 130.

[0084] In the embodiment of the present application, when the axial internal flow channel 141 is distributed in the groove wall of the motor groove 120 and the groove wall of the reducer groove 130, the oil in the axial internal flow channel 141 can not only lubricate the bearing 500a accommodated in the bearing chamber 111a, but also cool and lubricate other components of the drive motor 200 and the reducer 300, which is beneficial to improve the utilization rate of the oil.

[0085] Please continue reading Figure 4 and Figure 5 In one embodiment, the extending direction of the axial inner flow channel 141 is parallel to the axial direction O of the drive motor 200 , and the extending direction of the partition inner flow channel 142 is perpendicular to the axial direction O of the drive motor 200 .

[0086] In the embodiment of the present application, the extension direction of the axial internal flow channel 141 is parallel to the arrangement direction of the motor slot 120 and the reducer slot 130 and the opening direction of the motor slot 120 and the reducer slot 130, which is conducive to reducing the difficulty of processing the axial internal flow channel 141. In the internal flow channel 140 of the housing 100, the oil flows from one end 1411 of the axial internal flow channel 141 to the other end 1422 of the partition internal flow channel 142. When the starting point and the end point have been determined, the extension direction of the partition internal flow channel 142 is perpendicular to the extension direction of the axial internal flow channel 141, which is conducive to shortening the movement path of the oil.

[0087] It can be understood that the extension direction of the internal flow channel 142 of the partition is perpendicular to the axial direction O of the drive motor 200, which means that the plane where the internal flow channel 142 of the partition is located is perpendicular to the axial direction O of the drive motor 200, and does not mean that the extension direction of the internal flow channel 142 of the partition must be a straight line.

[0088] Please continue reading Figure 5 In one embodiment, the inner diameter of the other end 1412 of the axial inner flow channel 141 is greater than the inner diameter of the one end 1421 of the partition inner flow channel 142 .

[0089] In the embodiment of the present application, the other end 1412 of the axial internal flow channel 141 is connected to one end 1421 of the partition internal flow channel 142. The inner diameter of the other end 1412 of the axial internal flow channel 141 is larger than the inner diameter of one end 1421 of the partition internal flow channel 142. Exemplarily, the ratio of the inner diameter of one end 1421 of the partition internal flow channel 142 to the inner diameter of the other end 1412 of the axial internal flow channel 141 is less than or equal to 1 / 4. Reasonable distribution of the flow rate of the oil flowing to the bearing chamber 111a can avoid excessive oil from entering the bearing chamber 111a, which is beneficial to reducing the oil stirring loss of the bearing 500a. The partition internal flow channel 142 plays a throttling role, so that most of the remaining oil in the axial internal flow channel 141 can also flow to the drive motor 200 or other components of the reducer 300, which is beneficial to improve the lubrication and cooling effect of the powertrain 10 as a whole.

[0090] In the embodiment of the present application, illustratively, the ratio of the inner diameter of one end 1421 of the partition internal flow channel 142 to the inner diameter of the other end 1412 of the axial internal flow channel 141 is greater than or equal to 1 / 3. The inner diameter of one end 1421 of the partition internal flow channel 142 cannot be too small, otherwise it will be difficult to ensure the lubrication effect of the bearing 500a accommodated in the bearing chamber 111a.

[0091] Please continue reading Figure 4 and Figure 5 In one embodiment, the surface of the partition 110 includes a guide groove 112, one end 1121 of the guide groove 112 is used to receive the oil output from the other end 1422 of the flow channel 142 inside the partition, and the other end 1122 of the guide groove 112 is used to transport the oil to the bearing chamber 111a.

[0092] In the embodiment of the present application, after the oil flows out from the internal flow channel 142 of the partition, it moves to the guide groove 112 on the surface of the partition 110. The two ends of the guide groove 112 are used to connect the internal flow channel 142 of the partition and the bearing chamber 111a. The axial internal flow channel 141, the internal flow channel 142 of the partition and the guide groove 112 are all integrated into the housing 100 of the power assembly 10, which is conducive to improving the structural strength of the flow channel for transmitting oil and can also reduce the number of structural parts of the power assembly 10. In one embodiment, the guide groove 112 and the bearing chamber 111a can be distributed on the same surface or different surfaces of the partition 110. When the guide groove 112 and the bearing chamber 111a are distributed on different surfaces of the partition 110, since the bottom wall of the bearing chamber 111a is adjacent to the surface of the partition 110 where the guide groove 112 is located, the guide groove 112 can directly transport the oil to the bottom wall of the bearing chamber 111a.

[0093] Please continue reading Figure 4 and Figure 5 In one embodiment, the bearing chamber 111a and the guide groove 112 are distributed on the side of the partition 110 along the axial direction O of the drive motor 200 toward the reducer groove 130 , and the concave direction of the bearing chamber 111a and the guide groove 112 is toward the motor groove 120 .

[0094] In the embodiment of the present application, the bearing chamber 111a is located on the side of the partition 110 facing the reducer groove 130, and the bearing chamber 111a and the guide groove 112 are adjacent to the gear shaft assembly of the reducer 300. In order to cooperate with the bearing chamber 111a, the axial internal flow channel 141 is located inside the groove wall of the reducer groove 130, or the axial internal flow channel 141 is located inside the groove wall of the reducer groove 130 and inside the groove wall of the motor groove 120. The bearing chamber 111a and the guide groove 112 are formed on the same side of the partition 110, and the oil can enter the bearing chamber 111a from the opening of the bearing chamber 111a, which can increase the contact area between the oil and the bearing 500a, and is also conducive to reducing the difficulty of processing the bearing chamber 111a and the guide groove 112.

[0095] Please continue reading Figure 4 and Figure 5 In one embodiment, the surface of the partition 110 includes two oil-collecting protrusions 113 spaced apart from each other, and the two oil-collecting protrusions 113 are distributed on both sides of the notch of the guide groove 112. The two oil-collecting protrusions 113 protrude from the surface of the partition 110. The length of each of the two oil-collecting protrusions 113 is less than the length of the guide groove 112. The length of one of the two oil-collecting protrusions 113 is less than the length of the other oil-collecting protrusion 113, and the interval between one of the two oil-collecting protrusions 113 and the bearing chamber 111a is greater than the interval between the other oil-collecting protrusion 113 and the bearing chamber 111a.

[0096] In the embodiment of the present application, for the convenience of description, one oil collecting protrusion 113 is recorded as oil collecting protrusion 113a, and the other oil collecting protrusion 113 is recorded as oil collecting protrusion 113b. The oil collecting protrusion 113a, the oil collecting protrusion 113b and the guide groove 112 are formed on the same surface of the partition 110, that is, the oil collecting protrusion 113a, the oil collecting protrusion 113b and the guide groove 112 are all distributed on the side of the partition 110 facing the motor groove 120, or the oil collecting protrusion 113a, the oil collecting protrusion 113b and the guide groove 112 are all distributed on the side of the partition 110 facing the reducer groove 130.

[0097] Under the vibration of the rotating parts of the power assembly 10, part of the oil in the guide groove 112 may leak out from the notch of the guide groove 112 before flowing into the bearing chamber 111a. In the embodiment of the present application, the oil collecting protrusion 113a and the oil collecting protrusion 113b are arranged on both sides of the notch of the guide groove 112, which is equivalent to extending the groove wall of the guide groove 112, and can also increase the space for transmitting oil, which is conducive to reducing oil loss. The length of the oil collecting protrusion 113a and the oil collecting protrusion 113b are both less than the length of the guide groove 112, and the oil collecting protrusion 113a and the oil collecting protrusion 113b are both spaced from the bearing chamber 111a, so that the other end 1122 of the guide groove 112 can play a major guiding role for the oil, facilitating the oil to flow from the guide groove 112 into the bearing chamber 111a. The length of the oil collecting protrusion 113a is smaller than that of the oil collecting protrusion 113b, and the distance between the oil collecting protrusion 113a and the bearing chamber 111a is larger than the distance between the oil collecting protrusion 113b and the bearing chamber 111a, so that other structures can be arranged between the bearing chamber 111a and the oil collecting protrusion 113a to save space.

[0098] In the embodiment of the present application, the oil collecting protrusions 113a and 113b themselves can also play a role in passive lubrication to supplement the effect of active lubrication. Specifically, the oil collecting protrusions 113a and 113b protrude from the surface of the partition 110. When the guide groove 112 faces the reducer groove 130, the oil collecting protrusions 113a and 113b can be used to collect the oil thrown out from the input wheel 330 or the intermediate wheel 350 of the gear shaft assembly. When the guide groove 112 faces the motor groove 120, the oil collecting protrusions 113a and 113b can be used to collect the oil thrown out from the rotor of the drive motor 200. The oil collected by the two oil collecting protrusions 113 then flows to the guide groove 112 and the bearing chamber 111a in turn, thereby improving the utilization rate of the oil. The embodiment of the present application combines active lubrication and passive lubrication, which is beneficial to increase the amount of oil used to lubricate the bearing 500a and enhance the lubrication effect on the bearing 500a.

[0099] In one embodiment, the guide groove 112 may be directly formed by enclosing the oil collecting protrusion 113 a and the oil collecting protrusion 113 b , that is, the two oil collecting protrusions 113 directly serve as the groove wall of the guide groove 112 .

[0100] Please continue reading Figures 3 to 5 In one embodiment, two oil collecting protrusions 113 are distributed on the side of the partition 110 facing the reducer slot 130, and the two oil collecting protrusions 113 protrude from the surface of the partition 110 in a direction away from the motor slot 120. The oil collecting protrusion 113a is arranged on one side of the oil collecting protrusion 113b along the circumferential direction C of the drive motor 200. The height of the oil collecting protrusion 113a protruding from the surface of the partition 110 is less than the height of the oil collecting protrusion 113b protruding from the surface of the partition 110.

[0101] In the embodiment of the present application, the oil collecting protrusion 113a and the oil collecting protrusion 113b are located on the side of the partition plate 110 facing the reducer groove 130, and the two oil collecting protrusions 113 are arranged along the circumferential direction C of the drive motor 200, so that in the two different situations of the gear shaft assembly rotating forward and reverse, the two surfaces of the oil collecting protrusion 113a and the oil collecting protrusion 113b along the circumferential direction C of the drive motor 200 can both play a role in collecting oil, reducing the difficulty of the two oil collecting protrusions 113 in collecting oil under different situations. Figure 3 Taking the perspective shown as an example, the oil collecting protrusion 113a is arranged on one side of the oil collecting protrusion 113b along the clockwise direction. For example, the power assembly 10 of the embodiment of the present application is applied to a vehicle, and the oil collecting protrusion 113a is arranged above the oil collecting protrusion 113b along the gravity direction.

[0102] In the embodiment of the present application, since the oil collecting protrusion 113b is closer to the bearing chamber 111a than the oil collecting protrusion 113a, the height of the oil collecting protrusion 113b relative to the surface of the partition 110 is greater than the height of the oil collecting protrusion 113a relative to the surface of the partition 110, the oil collecting protrusion 113b can collect relatively more oil and transport relatively more oil to the relatively closer bearing chamber 111a, which is beneficial to reduce oil loss.

[0103] Please continue reading Figure 3 and Figure 4 In one embodiment, the projection of at least one of the oil collecting protrusions 113a or 113b along the circumferential direction C of the drive motor 200 partially overlaps with the projection of at least one of the input wheel 330 or the intermediate wheel 350 in the gear assembly. The input wheel 330 is used for transmission connection with the input shaft bearing 310, and the intermediate wheel 350 is used for meshing with the input wheel 330. The embodiment of the present application helps to reduce the difficulty of the oil collecting protrusions 113 collecting oil by coordinating the two oil collecting protrusions 113 with the input wheel 330 and the intermediate wheel 350 in terms of position layout.

[0104] Please continue reading Figures 3 to 5In one embodiment, the surface of the partition 110 further includes a mounting groove 114, the groove wall of the mounting groove 114 surrounds the bearing chamber 111a, and the mounting groove 114 is used to install an annular bearing cover plate 600, and the annular bearing cover plate 600 is used to enclose a portion of the guide groove 112 and a portion of the bearing chamber 111a.

[0105] In the embodiment of the present application, the mounting groove 114 and the annular mounting cover plate are both annular. The bearing 500a accommodated in the bearing chamber 111a has a relatively high rotation speed, and the annular bearing cover plate 600 encloses a portion of the bearing chamber 111a, which is conducive to reducing the axial movement of the bearing 500a and avoiding operation failures of the power assembly 10. Exemplarily, in one embodiment, the inner diameter of the annular bearing cover plate 600 is larger than the inner diameter of the bearing 500a fixed to the bearing chamber 111a, the inner diameter of the annular bearing cover plate 600 is smaller than the inner diameter of the bearing chamber 111a, the outer diameter of the annular bearing cover plate 600 is larger than the inner diameter of the bearing chamber 111a, and the annular bearing cover plate 600 is used to abut the inner ring of the bearing 500a.

[0106] In the embodiment of the present application, the groove wall of the mounting groove 114 is located on the outer peripheral side of the bearing chamber 111a, so that the annular bearing cover plate 600 can also cover a portion of the guide groove 112. The annular bearing cover plate 600 can prevent the oil transmitted between the guide groove 112 and the bearing chamber 111a from leaking, and plays the role of oil barrier, which is beneficial to reduce oil loss and realize the reuse of the annular bearing cover plate 600.

[0107] Please continue reading Figure 5 In one embodiment, the bearing chamber 111a includes two sections of liquid reservoirs 1111, one of which is distributed on the inner circumferential wall of the bearing chamber 111a, the other of which is distributed on the bottom wall of the bearing chamber 111a, and the other section of the liquid reservoir 1111 is connected to the guide groove 112 through the first section of the liquid reservoir 1111. The notch of the first section of the liquid reservoir 1111 faces the axis of the bearing chamber 111a along the radial direction of the bearing chamber 111a, and the notch of the other section of the liquid reservoir 1111 faces away from the motor slot 120 along the axial direction of the bearing chamber 111a. The axis of the bearing chamber 111a is parallel to the axial direction O of the drive motor 200.

[0108] In the embodiment of the present application, for the convenience of description, one section of the liquid reservoir 1111 is recorded as liquid reservoir 1111a, and the other section of the liquid reservoir 1111 is recorded as liquid reservoir 1111b. The guide groove 112, the liquid reservoir 1111a and the liquid reservoir 1111b are arranged in sequence along the axis of the bearing chamber 111a, and the oil in the guide groove 112 flows to the liquid reservoir 1111a and the liquid reservoir 1111b in sequence. Among them, the axial direction of the bearing chamber 111a is parallel to the axial direction O of the drive motor 200, and the radial direction of the bearing chamber 111a is parallel to the radial direction R of the drive motor 200.

[0109] In the embodiment of the present application, the reservoir 1111a is distributed on the inner peripheral wall of the bearing chamber 111a, and the reservoir 1111b is distributed on the bottom wall of the bearing chamber 111a. The reservoir 1111a and the reservoir 1111b are both spaced apart from the bearing 500a, and the reservoir 1111a and the reservoir 1111b can guide the inflowing oil to lubricate different surfaces of the bearing 500a, which is beneficial to increase the contact area between the oil and the bearing 500a. The reservoir 1111a and the reservoir 1111b can also play the role of storing oil, so that the oil can have an infiltration effect on part of the surface of the bearing 500a.

[0110] Please refer to Figure 3 and Figure 6 , Figure 6 A schematic diagram of a powertrain 10 provided in an embodiment of the present application. In one embodiment, the bearing chamber 111a is recessed toward the motor slot 120 along the axial direction O of the drive motor 200 so that an annular protrusion 115 is formed on the side of the partition 110 facing the motor slot 120, and the annular protrusion 115 is embedded in the motor slot 120 along the axial direction O of the drive motor 200, and the partition 110 also includes an axial hole 116. The axial hole 116 penetrates the bottom wall of the bearing chamber 111a and the annular protrusion 115 along the axial direction O of the drive motor 200, and one of the motor shaft 210 of the drive motor 200 or the input shaft 320 of the reducer 300 passes through the axial hole 116 to be transmission-connected to the other of the motor shaft 210 of the drive motor 200 or the input shaft 320 of the reducer 300.

[0111] In the embodiment of the present application, the shaft hole 116 of the partition 110 passes through the bottom wall of the bearing chamber 111a and the annular protrusion 115 along the axial direction O of the drive motor 200, so that the oil flowing into the bearing chamber 111a can flow into the motor slot 120 through the shaft hole 116, lubricate and cool the drive motor 200 accommodated in the motor slot 120, and improve the utilization rate of the oil. The annular protrusion 115 is embedded in the motor slot 120, which can shorten the axial distance O between the shaft hole 116 and the drive motor 200, and reduce the difficulty of the oil flowing into the motor slot 120. In one embodiment, the liquid storage tank 1111b is adjacent to and connected to the shaft hole 116.

[0112] In the embodiment of the present application, the bearing chamber 111a is recessed toward the motor slot 120 along the axial direction O of the drive motor 200, and the projection of the bearing chamber 111a along the radial direction R of the drive motor 200 partially overlaps with the projection of the slot wall of the motor slot 120, which is equivalent to borrowing part of the space in the motor slot 120 to form the bearing chamber 111a, which is beneficial to reducing the overall axial length of the power assembly 10. In this case, the guide groove 112 and the two oil collecting protrusions 113 are equivalent to the depression or protrusion of the plane where the opening of the bearing chamber 111a is located, which is beneficial to reducing the processing difficulty and cost of the guide groove 112 and the two oil collecting protrusions 113, and reducing the resistance of the oil in the transmission path.

[0113] If the bearing chamber 111a is protruded away from the motor slot 120 along the axial direction O of the drive motor 200, and the guide groove 112 and the two oil collecting protrusions 113 are distributed on the side of the partition 110 facing the reducer slot 130, in this case, in order to enable the two oil collecting protrusions 113 to collect oil, the axial length of the two oil collecting protrusions 113 must be greater than the axial length of the inner circumferential wall of the bearing chamber 111a. In the embodiment of the present application, when the bearing chamber 111a is embedded in the motor slot 120, the height of the two oil collecting protrusions 113 protruding from the surface of the partition 110 can be small, which will not affect the oil collecting effect of the oil collecting protrusions 113, and can also reduce the cost of the two oil collecting protrusions 113, and avoid the two oil collecting protrusions 113 from interfering with other devices in the power assembly 10, thereby optimizing the layout in the power assembly 10.

[0114] See also Figure 7 , Figure 7 Schematic diagram of the power assembly 10 provided in an embodiment of the present application. In another embodiment, the bearing chamber 111a is recessed along the axial direction O of the drive motor 200 toward the reducer slot 130 so that an annular protrusion 115 is formed on the side of the partition 110 facing the reducer slot 130, and the annular protrusion 115 is embedded in the reducer slot 130 along the axial direction O of the drive motor 200. The guide groove and the two oil collecting protrusions are distributed on the side of the partition 110 facing the motor slot 120.

[0115] In the embodiment of the present application, since the annular protrusion 115 is not embedded in the inner cavity of the end winding 231, in order to ensure that the reducer groove 130 has sufficient accommodation space, it is possible to consider reducing the axial distance between the entire partition 110 and the end winding 231. It can be understood that the orientation of the bearing chamber 111a will not affect the lubrication effect of the bearing 500a in the embodiment of the present application, as long as the axial internal flow channel and the internal flow channel of the partition can transport the oil to the bearing chamber 111a to achieve active lubrication of the bearing 500a.

[0116] Please continue reading Figure 6In one embodiment, the O-ring protrusion 115 is embedded into the inner cavity of the end winding 231 of the drive motor 200 along the axial direction of the drive motor 200 .

[0117] In the embodiment of the present application, the stator 220 of the drive motor 200 includes a plurality of winding slots arranged in sequence along the circumferential direction C of the drive motor 200, and the plurality of winding slots are used to accommodate the winding 230 of the drive motor 200. Among them, the end of the winding 230 of the drive motor 200 is exposed from the winding slot of the stator 220, and the end of the winding 230 of the drive motor 200 is referred to as the end winding 231. During the operation of the power assembly 10, the resistance generated by the current flowing through the end winding 231 will cause energy loss, and the lost energy will gradually be converted into heat, causing the temperature of the end winding 231 to continue to rise. In the embodiment of the present application, the annular protrusion 115 is embedded in the inner cavity of the end winding 231, so that the oil in the bearing chamber 111a can cool the end winding 231 through the shaft hole 116, which is conducive to reducing the heat loss of the end winding 231 and improving the working efficiency of the drive motor 200.

[0118] In the embodiment of the present application, the space of the motor slot 120 used by the bearing chamber 111a and the annular protrusion 115 specifically refers to the inner cavity of the end winding 231 facing the partition 110. It can be understood that the end winding 231 is annular, and the inner cavity of the end winding 231 is a space generally provided by the current drive motor 200. In the embodiment of the present application, the inner cavity of the end winding 231 is used to accommodate the annular protrusion 115 and the bearing chamber 111a, which can not only reduce the processing difficulty of the flow channel structure for transmitting oil, reduce the flow resistance of the oil, but also shorten the axial length of the power assembly 10.

[0119] Please continue reading Figure 5 In one embodiment, the other end 1122 of the guide groove 112 along the axial direction O of the drive motor 200 is recessed toward the liquid storage tank 1111a, and the distance between the other end 1122 of the guide groove 112 and the liquid storage tank 1111a along the axial direction O of the drive motor 200 is smaller than the distance between the one end 1121 of the guide groove 112 and the liquid storage tank 1111a.

[0120] In the embodiment of the present application, the other end 1122 of the guide groove 112 is connected to the liquid storage tank 1111a of the bearing chamber 111a. Since the annular bearing cover plate 600 needs to enclose a part of the other end 1122 of the guide groove 112, there needs to be a gap between the other end 1122 of the guide groove 112 and the annular bearing cover plate 600 along the axial direction O of the drive motor 200, otherwise it will cause the oil in the guide groove 112 to be difficult to flow into the bearing chamber 111a. The other end 1122 of the guide groove 112 is recessed toward the liquid storage tank 1111a, and the other end 1122 of the guide groove 112 along the axial direction O of the drive motor 200 is closer to the liquid storage tank 1111 than one end 1121 of the guide groove 112, which is conducive to reducing the flow resistance of the oil. The internal flow channel 142 of the partition is close to the groove wall of the reducer groove 130. Along the axial direction O of the drive motor 200, the distance between one end 1121 of the guide groove 112 and the liquid storage groove 1111a is greater than the distance between the other end 1122 of the guide groove 112 and the liquid storage groove 1111a, which is equivalent to that one end 1121 of the guide groove 112 is closer to the groove wall of the reducer groove 130 than the other end 1122 of the guide groove 112, so that one end 1121 of the guide groove 112 can receive the oil transmitted by the internal flow channel 142 of the partition.

[0121] In the embodiment of the present application, since the bearing chamber 111a is embedded in the motor slot 120, there may be a height difference between one end 1121 of the guide groove 112 and the bearing chamber 111a along the axial direction O of the drive motor 200. In order to buffer the oil, the other end 1122 of the guide groove 112 is recessed toward the liquid storage tank 1111a in the embodiment of the present application, and one end 1121 of the guide groove 112, the other end 1122 of the guide groove 112, the liquid storage tank 1111a and the liquid storage tank 1111b together form a stepped structure, which is conducive to reducing the loss of oil in the transmission path.

[0122] Please continue reading Figures 3 to 5 In one embodiment, the partition 110 includes another bearing chamber 111 for fixing the intermediate shaft bearing of the reducer 300 , and the distance between the other end 1412 of the axial inner flow channel 141 and the axis of the bearing chamber 111a is smaller than the distance between the other end 1412 of the axial inner flow channel 141 and the axis of the other bearing chamber 111 .

[0123] In the embodiment of the present application, for the convenience of description, the other bearing chamber 111 is recorded as bearing chamber 111b. The intermediate shaft bearing fixed in the bearing chamber 111b is used for transmission connection with the intermediate shaft 340 of the gear shaft assembly, and the intermediate shaft 340 is transmission connected with the intermediate wheel 350. The axial internal flow channel 141 is used as the starting point of the bearing lubrication structure, and the bearing chamber 111a is used as the end point of the bearing lubrication oil circuit. The axis of the bearing chamber 111a is closer to the other end 1412 of the axial internal flow channel 141 than the axis of the bearing chamber 111b, which is equivalent to shortening the distance between the starting point and the end point of the bearing lubrication oil circuit, which is beneficial to reduce the loss of oil in the transmission path and improve the efficiency of oil guide. The distance between the other end 1412 of the axial internal flow channel 141 and the axis of the bearing chamber 111a is relatively small, and the axial internal flow channel 141, the partition internal flow channel 142, the guide groove 112 and the two oil collecting protrusions 113 are arranged compactly, which is beneficial to realize the miniaturization design of the power assembly 10.

[0124] Please continue reading Figure 3 and Figure 6 In one embodiment, the partition 110 further includes a threading hole 117, through which a copper bar of the power assembly 10 is connected to the end winding 231 of the drive motor 200, and the threading hole 117 passes through the partition 110 along the axial direction O of the drive motor 200. The threading holes 117 are arranged between the oil collecting protrusion 113a and the bearing chamber 111b along the circumferential direction C of the drive motor 200.

[0125] In the embodiment of the present application, the copper bar of the power assembly 10 enters the motor slot 120 through the threading hole 117 of the partition 110 and is electrically connected to the end winding 231. Since the working current flowing through the copper bar is relatively large, the copper bar generates relatively large heat.

[0126] In the embodiment of the present application, the bearing chamber 111b is aligned with the intermediate wheel 350 along the axial direction O of the drive motor 200, and the position of the bearing chamber 111b in the power assembly 10 can correspond to the layout of the intermediate wheel 350. The intermediate wheel 350 will swing the oil during the rotation process. If the oil collecting protrusion 113a is arranged between the threading hole 117 and the bearing chamber 111b, the oil collecting protrusion 113a will block the splashing oil, making it difficult for the copper bar to be cooled by the oil. The oil collecting protrusion 113a of the embodiment of the present application is arranged on the side of the threading hole 117 away from the bearing chamber 111b along the circumferential direction C of the drive motor 200, so that part of the oil swung by the intermediate wheel 350 can also contact the copper bar, avoiding the copper bar from overheating and failure. Since the embodiment of the present application mainly reduces the wear of the bearing 500a by active lubrication, passive lubrication plays the role of replenishing the oil volume, even if a small part of the oil is blocked by the copper bar, it will not cause a significant negative impact on the lubrication effect of the bearing 500a.

[0127] In one embodiment, the surface of the partition further includes another oil collecting protrusion, and the another oil collecting protrusion protrudes from the side of the partition 110 facing the reducer groove 130. The another oil collecting protrusion intersects with one of the two oil collecting protrusions 113, and the another oil collecting protrusion is spaced from the other of the two oil collecting protrusions 113. The spacing between the another oil collecting protrusion and the bearing chamber 111a is greater than the spacing between one of the two oil collecting protrusions 113 and the bearing chamber 111a. The angle between the another oil collecting protrusion and one of the two oil collecting protrusions 113 opens toward the bearing chamber 111a.

[0128] In the embodiment of the present application, another oil collecting protrusion intersects with one of the two oil collecting protrusions 113 to form an oil collecting groove, and the groove wall of the oil collecting groove is used to collect and store oil. The angle opening between the another oil collecting protrusion and one of the two oil collecting protrusions 113 faces the bearing chamber 111a, so that the oil collecting groove can transport the collected oil to the bearing chamber 111a. The spacing between the another oil collecting protrusion and the other of the two oil collecting protrusions 113 can prevent the oil collecting groove from negatively affecting the oil collecting effect of the two oil collecting protrusions 113.

[0129] The above is a detailed introduction to the powertrain and vehicle with a bearing lubrication structure provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those of ordinary skill in the art, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A power assembly with a bearing lubrication structure, characterized in that: The housing of the power assembly includes a partition, a motor slot and a reducer slot, wherein the motor slot and the reducer slot are arranged on both sides of the partition along the axial direction of the driving motor in the power assembly, the partition includes a bearing chamber, and the bearing chamber is used to fix the motor shaft bearing of the driving motor or the input shaft bearing of the reducer in the power assembly, and the internal flow channel of the housing includes an axial internal flow channel and a partition internal flow channel, wherein: One end of the axial internal flow channel is used to receive the oil output by the oil pump of the power assembly, and the other end of the axial internal flow channel is used to connect to one end of the internal flow channel of the partition, and the other end of the internal flow channel of the partition is used to transport oil to the bearing chamber to actively lubricate the motor shaft bearing or the input shaft bearing fixed to the bearing chamber.

2. The powertrain according to claim 1, characterized in that: The one axial internal flow channel is distributed inside at least one of the groove walls of the one motor groove or the one reducer groove, the one partition internal flow channel is distributed inside the one partition, and the extension direction of the one partition internal flow channel intersects with the extension direction of the one axial internal flow channel.

3. The powertrain according to claim 2, characterized in that: The extending direction of the one axial internal flow channel is parallel to the axial direction of the driving motor, and the extending direction of the one partition internal flow channel is perpendicular to the axial direction of the driving motor.

4. The powertrain according to claim 2 or 3, characterized in that: The inner diameter of the other end of the one axial internal flow channel is greater than the inner diameter of the one end of the one partition internal flow channel.

5. The powertrain according to any one of claims 1 to 4, characterized in that: The surface of the partition includes a guide groove, one end of which is used to receive oil output from the other end of the internal flow channel of the partition, and the other end of the guide groove is used to transport oil to the bearing chamber.

6. The powertrain according to claim 5, characterized in that: The one bearing chamber and the one guide groove are distributed on the side of the one partition plate along the axial direction of the drive motor toward the reducer groove, and the concave direction of the one bearing chamber and the one guide groove is toward the one motor groove.

7. The powertrain according to claim 5 or 6, characterized in that: The surface of the partition includes two oil-collecting protrusions spaced apart from each other, and the two oil-collecting protrusions are distributed on both sides of the notch of the guide groove. The two oil-collecting protrusions protrude from the surface of the partition, and the length of each of the two oil-collecting protrusions is smaller than the length of the guide groove, and the length of one of the two oil-collecting protrusions is smaller than the length of the other oil-collecting protrusion, and the distance between one of the two oil-collecting protrusions and the bearing chamber is greater than the distance between the other oil-collecting protrusion and the bearing chamber.

8. The powertrain according to claim 7, characterized in that: The two oil collecting protrusions are distributed on the side of the one partition plate facing the one reducer slot, the two oil collecting protrusions protrude from the surface of the one partition plate in a direction away from the one motor slot, and one of the two oil collecting protrusions is arranged on one side of the other oil collecting protrusion along the circumference of the drive motor, wherein: The height of the one oil collecting protrusion protruding from the one partition surface is smaller than the height of the other oil collecting protrusion protruding from the one partition surface.

9. The power assembly according to any one of claims 5 to 8, characterized in that: The surface of the partition also includes a mounting groove, the groove wall of the mounting groove surrounds the bearing chamber, the mounting groove is used to install an annular bearing cover plate, and the annular bearing cover plate is used to enclose a portion of the guide groove and a portion of the bearing chamber.

10. The power assembly according to any one of claims 5 to 9, characterized in that: The one bearing chamber comprises two sections of liquid reservoirs, one section of the two sections of liquid reservoirs is distributed on the inner peripheral wall of the one bearing chamber, the other section of the two sections of liquid reservoirs is distributed on the bottom wall of the one bearing chamber, and the other section of the liquid reservoir is connected to the one guide groove through the one section of the liquid reservoir, wherein: The slot opening of one section of the liquid storage tank faces the axis of the one bearing chamber along the radial direction of the one bearing chamber, and the slot opening of the other section of the liquid storage tank faces away from the one motor slot along the axial direction of the one bearing chamber.

11. The powertrain according to claim 10, characterized in that: The other end of the guide groove is recessed toward the section of the liquid storage tank along the axial direction of the drive motor, and the distance between the other end of the guide groove and the section of the liquid storage tank along the axial direction of the drive motor is smaller than the distance between one end of the guide groove and the section of the liquid storage tank.

12. The power assembly according to any one of claims 1 to 11, characterized in that: The bearing chamber is recessed toward the motor slot along the axial direction of the drive motor so that the partition forms an annular protrusion toward the side of the motor slot, and the annular protrusion is embedded in the motor slot along the axial direction of the drive motor, and the partition further includes an axial hole, wherein: The one axial hole passes through the bottom wall of the one bearing chamber and the one annular protrusion along the axial direction of the drive motor, and one of the motor shaft of the drive motor or the input shaft of the reducer is connected to the other of the motor shaft of the drive motor or the input shaft of the reducer through the one axial hole.

13. The powertrain according to claim 12, characterized in that: The one annular protrusion is embedded in the inner cavity of the end winding of the drive motor along the axial direction of the drive motor.

14. The power assembly according to any one of claims 1 to 13, characterized in that: The one partition includes another bearing chamber, which is used to fix the intermediate shaft bearing of the reducer, and the distance between the other end of the one axial internal flow channel and the axis of the one bearing chamber is smaller than the distance between the other end of the one axial internal flow channel and the axis of the other bearing chamber.

15. A vehicle, characterized in that: The vehicle includes a frame, a battery pack and a powertrain as described in any one of claims 1-14, the frame is used to fix the battery pack and the powertrain, the battery pack is used to supply power to the drive motor through the powertrain, and the powertrain is used to drive the wheels of the vehicle through the drive motor and the reducer.

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