CN118654108A - Power assembly capable of adjusting lubricating oil liquid level and electric vehicle - Google Patents

Abstract

The application provides a power assembly capable of adjusting the liquid level of lubricating oil and an electric vehicle, wherein the power assembly comprises a speed reducer, the speed reducer comprises a speed reducer shell and a plurality of gears, and the speed reducer shell is used for accommodating an oil storage tank and the gears. At least one gear rotates in-process and stirs up the lubricating oil that a reduction gear casing stored, and an oil storage tank is used for collecting the lubricating oil that at least one gear rotated in-process and throws away, and the oil storage capacity of an oil storage tank is less than the oil storage capacity of a reduction gear casing. An oil reservoir includes an oil delivery passage for delivering lubrication oil to a reducer housing to regulate the level of lubrication oil in the reducer housing. According to the application, the oil storage tank can accommodate lubricating oil to reduce the liquid level of the lubricating oil in the speed reducer shell, so that the oil stirring loss of the speed reducer gear is reduced. The lubricating oil stored in the oil storage tank can be conveyed to one speed reducer shell so as to increase the liquid level of the lubricating oil in the speed reducer shell, thereby improving the lubricating effect of the speed reducer gear.

Description

Power assembly capable of adjusting lubricating oil liquid level and electric vehicle

Technical Field

The application relates to the technical field of power assemblies, in particular to a power assembly capable of adjusting the liquid level of lubricating oil and an electric vehicle.

Background

The gear of the speed reducer is usually cooled and lubricated by lubricating oil, so that the temperature of the gear is reduced, the abrasion of the gear is reduced, the working efficiency of the power assembly is improved, and the normal and safe operation of the power assembly is ensured. However, some gears in the reducer are often immersed in the lubricating oil, and rotation of the gears immersed in the lubricating oil agitates the lubricating oil, which may cause oil agitation loss, reducing the efficiency of the powertrain.

Disclosure of Invention

The application provides a power assembly capable of adjusting the liquid level of lubricating oil and an electric vehicle.

In a first aspect, the present application provides a powertrain with adjustable lubrication oil level, the powertrain including a drive motor and a decelerator. The drive motor is used for driving a plurality of wheels of an electric vehicle through the speed reducer, and the speed reducer comprises a speed reducer shell and a plurality of gears. The speed reducer housing is used for accommodating an oil storage tank and the gears. The one reducer housing is for storing lubricating oil. At least one of the gears stirs up lubricant stored in the one of the reducer housings during rotation. The oil storage tank is used for collecting lubricating oil thrown out in the rotation process of the at least one gear, and the oil storage capacity of the oil storage tank is smaller than that of the speed reducer shell. The oil storage tank comprises an oil delivery channel which is used for delivering lubricating oil to the speed reducer shell and adjusting the liquid level of the lubricating oil in the speed reducer shell.

In the embodiment of the application, the oil storage tank is used for accommodating lubricating oil, so that the oil mass of the lubricating oil accommodated in the speed reducer shell is reduced. The liquid level of lubricating oil in the speed reducer shell is reduced, the condition that a plurality of gears are soaked by the lubricating oil is reduced, so that the oil stirring loss of the speed reducer is reduced, and the working efficiency of the power assembly is improved.

In addition, the oil storage tank is used for conveying lubricating oil to the speed reducer shell through the oil conveying channel, and the liquid level of the lubricating oil in the speed reducer shell is increased, so that the plurality of gears can be fully cooled and lubricated.

According to the embodiment of the application, the oil storage tank can adjust the liquid level of the lubricating oil in the shell of the speed reducer according to different working conditions of the power assembly, so that the speed reducer can balance between reducing oil stirring loss and fully cooling and lubricating a plurality of gears according to the working conditions, and the maximum benefit is achieved.

In one embodiment, the one oil delivery passage is used to regulate the flow of lubricant to the one reducer housing based on the output torque of the powertrain. The output torque of the power assembly is larger than or equal to a first preset torque value, and the oil delivery channel increases the flow rate of the lubricating oil delivered to the one speed reducer shell. The output torque of the power assembly is smaller than or equal to a second preset torque value, the oil conveying channel reduces the flow of lubricating oil conveyed to the speed reducer shell, and the first preset torque value is larger than the second preset torque value.

The higher the torque value is, the higher the load of the power assembly is, the higher the rotating speed of gears in the speed reducer is, the larger the lubricating requirement of a plurality of gears in the speed reducer is, and the liquid level of lubricating oil in a shell of the speed reducer is required to be improved. The lower the torque value is, the lower the load of the power assembly is, and the active lubrication of the cooling and lubricating system in the speed reducer can meet the cooling and lubricating requirements of a plurality of gears in the speed reducer. Reducing the level of lubrication oil in the reducer housing helps to reduce the churning loss of the gears.

In the embodiment of the application, the purpose of adjusting the oil storage capacity of the speed reducer shell is achieved by adjusting and controlling the flow of the lubricating oil conveyed to the speed reducer shell by the oil conveying channel, so that the power assembly is adapted to the working conditions with different output torques.

In one embodiment, the one oil delivery passage is used to regulate the flow rate of the lubricant to the one reducer housing in accordance with the temperature of the lubricant. The temperature of the lubricating oil is less than or equal to a first preset temperature value, and the oil delivery passage starts to deliver the lubricating oil to the one speed reducer shell. The temperature of the lubricating oil is larger than a second preset temperature value, the oil conveying channel stops conveying the lubricating oil to the one speed reducer shell, and the second preset temperature value is larger than or equal to the first preset temperature value.

Wherein the lower the temperature of the lubricating oil, the higher the viscosity of the lubricating oil. The circulation efficiency of lubricating oil in the speed reducer shell is low, so that the active lubrication efficiency of a plurality of gears in the speed reducer is low, and the mode of active lubrication is only insufficient to support the lubrication requirement of rotation of the plurality of gears in the speed reducer at low temperature. The oil delivery passage starts to deliver lubricating oil to the reducer housing to increase the amount of lubricating oil contained in the reducer housing. The liquid level of the lubricating oil in the shell of the speed reducer is increased, so that the passive lubrication of one or more gears in the speed reducer is realized, and the cooling and lubricating effects of the gears in the speed reducer are improved.

The higher the temperature of the lubricating oil, the lower the viscosity of the lubricating oil, and the higher the active lubrication efficiency of the plurality of gears in the speed reducer. The active lubrication of the gears in the speed reducer can meet the cooling and lubrication requirements of the gears in the speed reducer. The oil delivery passage stops delivering the lubricating oil to the reducer housing to increase the oil storage capacity of the oil storage tank and decrease the oil storage capacity of the reducer housing. The liquid level of the lubricating oil in the shell of the speed reducer is reduced, so that the oil stirring loss of the speed reducer is reduced.

In this embodiment, through the condition of regulation and control oil delivery passageway to reduction gear casing conveying lubricating oil to adjust the liquid level of lubricating oil in the reduction gear casing, thereby make the operating mode of power assembly adaptation different lubricating oil temperature.

In one embodiment, the one oil delivery passage starts to deliver the lubricating oil to the one speed reducer housing or increases the flow rate of the lubricating oil delivered to the one speed reducer housing during the drive of the one electric vehicle to climb a slope. In the embodiment of the application, the oil conveying channel conveys lubricating oil to the speed reducer shell or increases the flow rate of conveying the lubricating oil to the speed reducer shell, so that the oil quantity of the lubricating oil contained in the speed reducer shell is increased. Therefore, the oil pump can be prevented from sucking empty, the risk of damage to the oil pump is reduced, and the service life of the oil pump is prolonged.

In one embodiment, the oil delivery channel comprises a liquid outlet and a valve, the valve is used for controlling the flow of the liquid outlet according to the working condition of the power assembly, the working condition of the power assembly comprises at least one of a temperature parameter or output torque, and the temperature parameter comprises at least one of a lubricating oil temperature, an environment temperature, a stator temperature of a driving motor and a rotor temperature.

In the embodiment of the application, the valve is arranged for regulating and controlling the flow of the liquid outlet, so that the purposes of controlling the oil storage capacity of the oil storage tank and controlling the oil storage capacity of the reducer shell are achieved, and the power assembly is adapted to different working conditions.

In one embodiment, the output torque of the powertrain is greater than a first preset torque value, and the one valve is configured to control the flow rate of the one liquid outlet to be greater than or equal to the flow rate of the lubricating oil collected by the notch of the one oil storage tank. The output torque of the power assembly is smaller than a second preset torque value, the valve is used for controlling the flow of the liquid outlet to be smaller than the flow of lubricating oil collected by the notch of the oil storage tank, and the first preset torque value is larger than the second preset torque value.

In the embodiment of the application, the valve is arranged for regulating and controlling the relative size of the flow between the liquid outlet and the notch, so that the aim of regulating the oil storage capacity of the speed reducer shell is fulfilled, and the power assembly is made to adapt to working conditions with different loads.

In one embodiment, the plurality of gears includes one input wheel, and the one oil reservoir is arranged between the one input wheel and the housing of the decelerator in a radial direction of the one input wheel. In the embodiment of the application, the oil storage tanks are arranged by fully utilizing the gap between the input wheel and the reducer shell, which is beneficial to the miniaturization of the power assembly.

In one embodiment, the one oil reservoir comprises two axial reservoir walls. The two axial groove walls are arranged opposite to each other along the axial direction of the one input wheel. The distance between the two axial groove walls along the axial direction of the input wheel is larger than the distance between any one axial groove wall and the end face of the input wheel.

In the embodiment of the application, the distance between each axial groove wall and the input wheel along the axial direction of the input wheel is smaller than the distance between the two axial groove walls. The distance between the two axial groove walls is larger, the volume of the oil storage groove is increased, and the oil storage groove is favorable for storing lubricating oil so as to reduce the lubricating oil level of the speed reducer shell, thereby reducing the oil stirring loss of the speed reducer. In addition, the projection of input wheel arranges between the projection of two axial cell walls, is favorable to the oil storage tank to receive the lubricating oil that the input wheel throws away.

In one embodiment, the one oil reservoir includes two connecting reservoir walls, the two connecting reservoir walls being arranged opposite each other. The two connecting groove walls enclose the two axial groove walls to form the notch. The distance between the two connecting groove walls along the arrangement direction of the two connecting groove walls is larger than or equal to the radius of the input wheel.

In the embodiment of the application, the interval between the two connecting groove walls is larger than the radius of the input wheel, the interval between the two connecting groove walls is larger, the volume of the oil storage groove is increased, and the oil storage groove is beneficial to storing lubricating oil so as to reduce the lubricating oil level of the speed reducer shell, thereby reducing the oil stirring loss of the speed reducer.

In one embodiment, a distance between one of the two connecting groove walls and the housing of the speed reducer is smaller than a distance between the other connecting groove wall and the housing of the speed reducer along an arrangement direction of the two connecting groove walls. Along the arrangement direction of the two connecting groove walls, the distance between one connecting groove wall and the axis of the input wheel is larger than the distance between the other connecting groove wall and the axis of the input wheel.

In the embodiment of the application, one connecting groove wall is arranged on one side of the input wheel, which is away from the middle wheel, along the arrangement direction of the two connecting groove walls. The oil storage tank is offset from the direction of input wheel orientation deviating from the intermediate wheel, has reduced the interference of oil storage tank to the intermediate wheel, and is favorable to the oil storage tank to receive the lubricating oil that a plurality of gears thrown away.

In one embodiment, the length of the other connecting groove wall is greater than the length of the one connecting groove wall in the depth direction of the one oil storage groove. In the embodiment of the application, compared with one connecting groove wall, the length of the other connecting groove wall is longer. The two connecting groove walls are unequal in length, so that the groove bottom of the oil storage groove is inclined at an angle, and the oil storage groove is favorable for smoothly discharging lubricating oil according to working conditions.

In one embodiment, the other connecting groove wall includes a liquid outlet for communicating the inside and the outside of the one oil storage groove. In the embodiment of the application, the liquid outlet is arranged on the other connecting groove wall, which is beneficial to smoothly discharging lubricating oil from the oil storage groove according to working conditions. In addition, along the range direction liquid outlet orientation intermediate wheel of two connecting groove walls, the liquid outlet is arranged in another connecting groove wall, is favorable to lubricating oil to get into the reduction gear casing fast from the oil storage tank to increase the liquid level of lubricating oil in the reduction gear casing.

In one embodiment, the inner diameter of the one liquid outlet is smaller than the width of the notch of the one oil storage tank along the axial direction of the one input wheel. In the embodiment of the application, the inner diameter of the liquid outlet is smaller, which is beneficial to controlling the flow of the liquid outlet. The width of the notch of the oil storage tank is large, so that the notch is favorable for receiving lubricating oil thrown out by the gear of the speed reducer.

In one embodiment, the distance between the one liquid outlet and the axis of the one input wheel is greater than the maximum distance between the one connecting groove wall and the axis of the one input wheel along the depth direction of the one oil storage groove. In the embodiment of the application, the liquid outlet is arranged at the lower part of the oil storage tank, which is beneficial to discharging the lubricating oil stored in the oil storage tank through the liquid outlet. And lubricating oil contained in the oil storage tank can be discharged from the liquid outlet to the speed reducer shell under the action of gravity, so that the energy consumption of the power assembly is reduced.

In one embodiment, the speed reducer housing includes a circumferential housing and two axial housings, the circumferential housing being arranged between the two axial housings along the one input wheel axis. Two end faces of each connecting groove wall along the axial direction of one input wheel are respectively connected with two axial shells, and the two axial shells between the two connecting groove walls along the arrangement direction of the two connecting groove walls are respectively used for forming two axial groove walls.

In the embodiment of the application, the oil storage tank is formed into two axial tank walls by means of two axial shells. The oil storage tank and the speed reducer shell share the two parts of the axial shells, which is beneficial to saving the cost. The width of the axial oil storage groove along the input wheel is the distance between the two axial shells, and the width of the oil storage groove is larger, so that the oil storage groove is beneficial to receiving and storing lubricating oil, and the liquid level of the lubricating oil in the shell of the speed reducer is reduced, and the oil stirring loss of the speed reducer is reduced.

In one embodiment, one side of each of the connecting groove walls facing away from the one input wheel in the depth direction of the one oil storage groove is used for connecting the circumferential housing, and the circumferential housing between the one side of the two connecting groove walls in the arrangement direction of the two connecting groove walls is used for forming the groove bottom of the one oil storage groove.

In an embodiment of the application, the oil storage tank is formed into a tank bottom by means of a circumferential housing. The oil storage tank and the speed reducer shell share a part of the circumferential shell, which is beneficial to saving cost.

In one embodiment, the plurality of gears includes one input wheel and one intermediate wheel, the one input wheel being meshed with the one intermediate wheel in a radial direction of the one input wheel. The radius of the one intermediate wheel is greater than the radius of the one input wheel. In the embodiment of the application, the size of the intermediate wheel is larger than that of the input wheel, so that a larger gap is formed between the input wheel and the speed reducer shell along the gravity direction. The oil storage tank is arranged in the gap between the input wheel and the speed reducer shell, so that the space in the speed reducer shell is fully utilized, and the power assembly is convenient to miniaturize. In addition, the volume of the oil storage tank is increased, the increase of the oil storage capacity of the oil storage tank can effectively reduce the liquid level of lubricating oil in the shell of the speed reducer, and therefore the oil stirring loss of the speed reducer is reduced.

In one embodiment, the radius of the one intermediate wheel is greater than or equal to the depth of the one oil reservoir. The whole sizes of the oil storage tank, the middle wheel and the input wheel are reduced, and the power assembly is miniaturized.

In one embodiment, the distance between the axis of the one input wheel and the tank bottom of the one tank is greater than the distance between the axis of the one input wheel and the axis of the one intermediate wheel and greater than the distance between the one intermediate wheel and the tank bottom of the one tank in the depth direction of the one tank. In the embodiment of the application, the oil storage tank, the intermediate wheel and the input wheel are compactly arranged, the space of the speed reducer shell is fully utilized, and the power assembly is beneficial to miniaturization.

In one embodiment, the one drive motor includes a motor stator, the plurality of gears includes one input wheel, and an axis of the motor stator coincides with an axis of the one input wheel. The radius of the motor stator is larger than the radius of the one input wheel. In the embodiment of the application, because the radius of the motor stator is larger, one axial shell is larger in size for adapting to the motor stator. Because of the smaller radius of the input wheel, there is a gap between the input wheel and the circumferential housing of the reducer in its radial direction. The oil storage tank is arranged in the gap between the input wheel and the circumferential shell, so that the internal space of the speed reducer shell is fully utilized, and the miniaturization of the power assembly is facilitated.

In one embodiment, the radius of the motor stator is greater than the depth of the one oil reservoir. In the embodiment of the application, the depth of the oil storage tank is smaller than the radius of the motor stator, so that the overall size of the oil storage tank and the input wheel is reduced, the oil storage tank is fixed on the speed reducer shell, the volume of the power assembly is not increased additionally or excessively, and the power assembly is convenient to miniaturize.

In one embodiment, the radius of the motor stator is greater than or equal to the distance between the axis of the one input wheel and the bottom of the one oil reservoir in the depth direction of the one oil reservoir. In the embodiment of the application, the whole size of the oil storage tank and the input wheel is smaller, so that the power assembly is convenient to miniaturize.

In a second aspect, the present application provides an electric vehicle comprising a wheel, a battery pack and a powertrain as described above for receiving power from the battery pack and driving the wheel.

Drawings

In order to more clearly describe the technical solution in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic diagram of an electric vehicle according to an embodiment of the application.

Fig. 2 is a schematic diagram of a powertrain according to an embodiment of the present application.

Fig. 3 is a front view of a powertrain according to an embodiment of the present application.

Fig. 4 is a side view of a decelerator and oil reservoir provided in an embodiment of the present application.

Fig. 5 is a front view of a powertrain according to an embodiment of the present application.

Fig. 6 is a front view of a powertrain according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

The terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

For convenience of understanding, the following explains and describes english abbreviations and related technical terms related to the embodiments of the application.

Parallel: the parallelism defined by the embodiments of the present application is not limited to absolute parallelism, and the definition of parallelism is understood to be substantially parallel, allowing for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, structural flatness, etc.

And (3) vertical: the vertical defined in the embodiments of the present application is not limited to an absolute vertical intersection (the included angle is 90 degrees), and allows a small angle range of error, for example, an assembly error range ranging from 80 degrees to 100 degrees, to be understood as a vertical relationship in a relation other than an absolute vertical intersection due to factors such as assembly tolerance, design tolerance, and structural flatness.

Referring to fig. 1, fig. 1 is a schematic diagram of an electric vehicle 1 according to an embodiment of the application. The electric vehicle 1 includes a battery pack 4, wheels 3, and a powertrain 2. The power assembly 2 and the battery pack 4 are mounted on a frame of the electric vehicle 1, and the power assembly 2 is used for receiving power supplied by the battery pack 4 and driving the wheels 3 to rotate. In an embodiment, the electric vehicle 1 may include one or more subassemblies 2.

The electric vehicle 1 includes two-wheel, three-wheel or four-wheel electric vehicles 1. The electric vehicle 1 may be one of a Pure electric vehicle (Pure ELECTRIC VEHICLE/Battery ELECTRIC VEHICLE, PEV/BEV), a Hybrid vehicle (Hybrid ELECTRIC VEHICLE, HEV), an Extended Range electric vehicle (Range Extended ELECTRIC VEHICLE, REEV), a Plug-in Hybrid ELECTRIC VEHICLE, PHEV, and a new energy vehicle (NEW ENERGY VEHICLE). In one embodiment, the electric vehicle 1 is a vehicle. The electric vehicle 1 is one of a commercial vehicle, a passenger vehicle, a motorcycle, an aerocar, and a train. In one embodiment, the electric vehicle 1 is an industrial vehicle or an engineering vehicle. The electric vehicle 1 is one of a forklift, a trailer, a tractor, an excavator, a bulldozer, and a crane. In an embodiment, the electric vehicle 1 may also be an agricultural device, an amusement device, a toy vehicle, or the like. Referring to fig. 2, fig. 2 is a schematic diagram of a powertrain 2 according to an embodiment of the application. The powertrain 2 includes a decelerator 10 and a driving motor 20. The input shaft of the speed reducer 10 is used for being in transmission connection with the motor shaft of the drive motor 20. The input shaft of the speed reducer 10 is used for receiving power transmitted by a motor shaft. Wherein the axial direction of the input shaft of the speed reducer 10 is parallel to the axial direction of the motor shaft. The gears of the reduction gear 10 are capable of changing the transmission ratio between the drive motor 20 and the wheels 3.

In one embodiment, powertrain 2 further includes a wheel drive half shaft 5 and a differential 6 (shown in FIG. 2). The wheel driving half shaft 5 is fixedly connected with the wheel 3. The speed reducer 10 receives power transmitted from a motor shaft through an input shaft of the speed reducer and transmits the power to the wheel drive half shaft 5 through the differential 6 to drive the wheels 3 to rotate. Wherein the differential 6 enables the left and right (or front and rear) wheels to rotate at different rotational speeds.

In one embodiment, the powertrain 2 includes two drive motors 20, the two drive motors 20 being used to independently control the two side wheels 3, respectively.

In one embodiment, the drive motor 20 includes a motor shaft, a motor rotor, a motor stator, and motor windings, the motor rotor being sleeved around and secured to an outer surface of the motor shaft. The motor stator is sleeved on the motor rotor and is arranged at intervals with the outer surface of the motor rotor. The motor winding is mounted and fixed to the motor stator.

In one embodiment, the powertrain 2 further includes a motor controller 7 (see also fig. 3). The battery pack 4 includes at least one power battery. The motor controller 7 is connected with the battery pack 4 and the motor winding of the driving motor 20, and the motor controller 7 is used for receiving the direct current output by the battery pack 4, converting the direct current output by the battery pack 4 into alternating current and transmitting the alternating current to the motor winding. The rotating magnetic field generated after the motor windings receive the alternating current interacts with the permanent magnets on the motor rotor. The electromagnetic field causes the motor rotor to rotate, thereby driving the motor shaft to rotate.

The gears of the speed reducer 10 are typically cooled and lubricated by lubricating oil to reduce the temperature of the gears and reduce wear between the gears, thereby improving the working efficiency of the powertrain 2 and ensuring normal and safe operation of the powertrain 2. However, some of the gears are often immersed in the lubricating oil, and rotation of the gears immersed in the lubricating oil agitates the lubricating oil, which may cause oil agitation loss, and reduce the efficiency of the power train 2. In the embodiment of the present application, the inside of the reducer housing 100 includes an oil reservoir 200, and the oil reservoir 200 is used to regulate the amount of lubricating oil contained in the reducer housing 100 according to the non-use condition of the power assembly 2. The power assembly 2 is in a working condition, and an oil storage tank 200 is used for reducing the oil stirring quantity of the gear of the speed reducer 10 so as to reduce the oil stirring loss of the gear of the speed reducer 10. The powertrain 2 is in another working condition, and an oil reservoir 200 is used to increase the amount of lubricating oil contained in the reducer housing 100, so as to improve the lubrication effect of the plurality of gears.

The powertrain 2 of the present application will be described in detail.

Please refer to fig. 3 and fig. 4. Fig. 3 is a front view of a powertrain 2 according to an embodiment of the present application. Fig. 4 is a side view of the decelerator 10 and the oil reservoir 200 according to an embodiment of the present application. The present application provides a powertrain 2 with adjustable lubrication oil level, the powertrain 2 comprising a drive motor 20 and a reduction gear 10, the drive motor 20 being adapted to drive a plurality of wheels 3 of an electric vehicle 1 via the reduction gear 10. The speed reducer 10 includes a speed reducer housing 100 and a plurality of gears, and the speed reducer housing 100 is configured to house a storage tank 200 and a plurality of gears. One of the reducer cases 100 is used for storing lubricating oil, and at least one of the gears agitates the lubricating oil stored in one of the reducer cases 100 during rotation. One oil reservoir 200 is used for collecting lubricating oil thrown out during rotation of at least one gear, and the oil storage capacity of one oil reservoir 200 is smaller than the oil storage capacity of one reducer housing 100. An oil reservoir 200 includes an oil delivery passage for delivering lubrication oil to a reducer housing 100 to regulate the level of lubrication oil in the reducer housing 100.

Among them, the lubricating oil contained in the speed reducer housing 100 is used for cooling and lubricating the plurality of gears of the speed reducer 10 by the cooling and lubricating system. Lubricating oil can be sprayed through the oil spray nozzle onto the plurality of gears to cool and lubricate the plurality of gears, which is also referred to as active lubrication. The lubricating oil flows toward and collects at the bottom of the reducer housing 100 by gravity.

In one embodiment, the cooling and lubrication system of the speed reducer 10 includes an oil pump. The oil pump delivers the lubricating oil in the speed reducer housing 100 to the parts of the power assembly 2 that need cooling lubrication, or to the parts via a heat exchanger. The parts comprise a plurality of gears of the speed reducer, a motor stator and a motor rotor. The lubricating oil flows through the components and then flows back to the bottom of the reducer housing 100, thereby circulating.

If one or more of the plurality of gears are in contact with the lubricant at the bottom of the decelerator casing 100, the one or more of the plurality of gears agitate the lubricant at the bottom of the decelerator casing 100 when rotated, thereby causing a large churning loss.

The decelerator housing 100 accommodates an oil reservoir 200. Part of the lubricating oil thrown out by one or more of the plurality of gears enters the interior of the oil reservoir 200 from the notch 201 of the oil reservoir 200. In one embodiment, the slot 201 of the reservoir 200 faces away from the bottom of the reducer housing 100 in the direction of gravity. The oil slinging path of each gear in the reducer 10 is shown by the dashed arrows in fig. 3.

In the embodiment of the present application, since a part of the lubricating oil is contained in the oil reservoir 200, the amount of oil contained in the reducer housing 100 is reduced. The liquid level of the lubricating oil contained in the reducer housing 100 is reduced, so that the condition that a plurality of gears are soaked by the lubricating oil is reduced, the oil stirring loss of the reducer 10 is reduced, and the working efficiency of the power assembly 2 is improved.

In the embodiment of the present application, the oil storage tank 200 further includes an oil delivery passage. An oil delivery passage is used to regulate the distribution of lubrication oil within the retarder 10 between the reservoir 200 and the retarder housing 100. The oil delivery passage can discharge the lubrication oil in the oil reservoir 200 to the decelerator housing 100, thereby adjusting the level of the lubrication oil in the decelerator housing 100. According to different working conditions of the power assembly 2, in one working condition, the oil delivery passage delivers the lubricating oil to the reducer housing 100 with an amount of oil smaller than the amount of oil received by the notch 201 of the oil reservoir 200, and the oil reservoir 200 stores the lubricating oil to reduce the level of the lubricating oil in the reducer housing 100.

In another working condition, the oil delivery channel delivers the lubricating oil to the reducer housing 100 with an amount greater than or equal to the amount of oil received by the notch 201 of the oil storage tank 200, and the level of the lubricating oil in the reducer housing 100 increases, which is beneficial for the plurality of gears to sufficiently cool and lubricate.

In the embodiment of the present application, the oil delivery channel is used to adjust the level of the lubricating oil in the reducer housing 100 according to the working condition of the power assembly 2. So that the speed reducer 10 can balance between reducing oil stirring loss and fully cooling and lubricating a plurality of gears according to working conditions so as to achieve maximum benefit.

In one embodiment, an oil delivery passage is used to regulate the flow of lubricant to a reducer housing 100 based on the output torque of the powertrain 2. The output torque of the powertrain 2 is greater than a first predetermined torque value and an oil delivery passage increases the flow rate of lubricant delivered to one of the reducer housings 100. The output torque of the powertrain 2 is less than a second preset torque value, and an oil delivery passage reduces the flow of lubricant delivered to one of the reducer housings 100, the first preset torque value being greater than the second preset torque value.

The output torque of the power assembly 2 is greater than a first preset torque value, the load of the power assembly 2 is higher, the rotation speed of gears in the speed reducer 10 is higher, and the mode of active lubrication is only insufficient to support the lubrication requirement of rotation of a plurality of gears in the speed reducer 10 during high load. A greater amount of lubrication oil is required within the reducer housing 100. The oil delivery passage increases the flow rate of the lubricating oil delivered to the speed reducer housing 100 to increase the amount of the lubricating oil contained in the speed reducer housing 100. The level of the lubricating oil contained in the decelerator housing 100 increases, and one or more gears in the decelerator 10 may be passively lubricated by agitating the lubricating oil in the decelerator housing 100 to sufficiently cool the plurality of gears of the lubricated decelerator 10.

The output torque of the power assembly 2 is smaller than a second preset torque value, the load of the power assembly 2 is lower, and the cooling and lubricating requirements of a plurality of gears in the speed reducer 10 can be met through active lubrication of the cooling and lubricating system in the speed reducer 10. The demand for lubricating oil by the reduction gear housing 100 is reduced. The oil delivery passage reduces the flow rate of the lubricating oil delivered to the decelerator housing 100 to increase the amount of the lubricating oil stored in the oil storage tank 200, thereby reducing the amount of the lubricating oil contained in the decelerator housing 100. The liquid level of the lubricating oil contained in the decelerator casing 100 is lowered, and the oil stirring loss of the decelerator 10 is reduced.

In the embodiment of the application, the purpose of adjusting the oil storage capacity of the speed reducer shell 100 is achieved by adjusting and controlling the flow of the lubricating oil conveyed to the speed reducer shell 100 by the oil conveying channel, so that the power assembly 2 is adapted to the working conditions with different output torques.

In one embodiment, the first preset torque value is greater than 50% of the peak motor torque. In one embodiment, the second preset torque value is less than or equal to 50% of the peak motor torque.

In one embodiment, an oil delivery passage is used to regulate the flow of lubricant to a reducer housing 100 based on the temperature of the lubricant. The temperature of the lubricating oil is less than or equal to the first preset temperature value, and an oil delivery passage starts to deliver the lubricating oil to a reducer housing 100. The temperature of the lubricating oil is greater than the second preset temperature value, and one oil delivery passage stops delivering the lubricating oil to one of the reducer cases 100. The second preset temperature value is greater than or equal to the first preset temperature value.

Wherein the temperature of the lubricating oil is less than or equal to a first preset temperature value, the temperature of the lubricating oil is lower, and the viscosity of the lubricating oil is higher. The low circulation efficiency of the lubricating oil in the reducer housing 100 makes the active lubrication of the plurality of gears in the reducer 10 low, and the manner of active lubrication alone is insufficient to support the lubrication requirement of the rotation of the plurality of gears in the reducer 10 at low temperatures. The oil delivery passage starts to deliver the lubricating oil to the decelerator housing 100 to increase the amount of the lubricating oil contained in the decelerator housing 100. The level of the lubricating oil in the reducer housing 100 is raised to achieve passive lubrication of one or more gears in the reducer 10, improving the cooling lubrication effect of the plurality of gears in the reducer 10.

The temperature of the lubricating oil is greater than the second preset temperature value, the temperature of the lubricating oil is higher, the viscosity of the lubricating oil is lower, and the active lubrication efficiency of the plurality of gears in the speed reducer 10 is higher. The active lubrication of the plurality of gears in the speed reducer 10 may meet the cooling lubrication requirements of the plurality of gears in the speed reducer 10. The oil delivery passage stops the delivery of the lubricating oil to the decelerator housing 100 to increase the oil storage amount of the oil storage tank 200 and reduce the oil storage amount of the decelerator housing 100. The level of the lubricating oil in the reducer housing 100 is reduced to reduce the churning loss of the reducer 10.

In this embodiment, the condition that the oil delivery channel delivers the lubricating oil to the reducer housing 100 is regulated so as to regulate the liquid level of the lubricating oil in the reducer housing 100, thereby enabling the power assembly 2 to adapt to the working conditions of different lubricating oil temperatures.

In one embodiment, the first preset temperature value is less than-20 ℃. In one embodiment, the first predetermined temperature value is greater than or equal to-20 ℃.

In one embodiment, during a drive train 2 driving an electric vehicle uphill, an oil delivery passage begins to deliver lubrication oil to a reducer housing 100 or increases the flow rate of lubrication oil to a reducer housing 100. Wherein, during the climbing of the electric vehicle, the powertrain 2 is in an inclined state. In the embodiment of the present application, the oil delivery passage delivers the lubricating oil to the speed reducer housing 100 or increases the flow rate of delivering the lubricating oil to the speed reducer housing 100, increasing the amount of the lubricating oil contained in the speed reducer housing 100. Therefore, the oil pump can be prevented from sucking empty, the risk of damage to the oil pump is reduced, and the service life of the oil pump is prolonged.

In one embodiment, an oil delivery passage includes a fluid outlet for discharging lubricant collected by a reservoir 200 to increase the amount of lubricant contained in the reducer housing 100. Wherein the liquid outlet communicates with the inside and the outside of the oil reservoir 200. The lubricating oil collected in the oil reservoir 200 can be discharged to the decelerator housing 100 through the liquid outlet.

In the embodiment of the application, the liquid outlet is used for adjusting the oil quantity of the lubricating oil contained in the oil storage tank 200 according to the working condition of the power assembly 2. So that the speed reducer 10 can balance between reducing oil stirring loss and fully cooling and lubricating a plurality of gears according to working conditions so as to achieve maximum benefit.

In one embodiment, the distance between the bottom 202 of one oil reservoir 200 and one fluid outlet is less than or equal to the distance between the notch 201 of one oil reservoir 200 and one fluid outlet along the depth of one oil reservoir 200.

In one embodiment, the tank bottom 202 of one of the oil tanks 200 includes a fluid outlet. A distance between a liquid outlet and the tank bottom 202 in the depth direction of one oil tank 200 is zero. The distance of the outlet from the slot 201 is greater than zero. The distance between the liquid outlet and the groove bottom 202 is greater than the distance between the liquid outlet and the groove opening 201.

In one embodiment, one wall of one oil reservoir 200 includes one fluid outlet. The distance between a liquid outlet and one end of a groove wall near the groove bottom 202 is smaller than the distance between a liquid outlet and the other end of a groove wall away from the groove bottom 202 along the depth direction of an oil storage groove 200.

In the embodiment of the application, the liquid outlet is arranged near the tank bottom 202, which is beneficial to discharging the lubricating oil stored in the oil storage tank 200. In one embodiment, the depth direction of the oil reservoir 200 is parallel to the direction of gravity. The liquid outlet is arranged at the lower part of the oil storage tank 200, and the lubricating oil contained in the oil storage tank 200 can be discharged from the liquid outlet to the reducer housing 100 under the action of gravity, so that the energy consumption of the power assembly 2 is reduced.

In one embodiment, an oil delivery channel includes a fluid outlet and a valve, the valve is used to control a fluid flow rate of the fluid outlet according to a working condition of the power assembly 2, the working condition of the power assembly 2 includes at least one of a temperature parameter or an output torque, and the temperature parameter includes at least one of a lubricant temperature, an ambient temperature, a stator temperature of a driving motor, and a rotor temperature.

Wherein, for different working conditions of the power assembly 2, the oil quantity requirement of the cooling and lubricating system of the speed reducer 10 on the lubricating oil is different. The oil demand of the cooling lubrication system on the lubricating oil may be reflected as the level of the lubricating oil in the reducer housing 100.

When the temperature of the lubricating oil is low or the output torque of the power assembly 2 is large, a larger amount of lubricating oil is required for cooling and lubricating the plurality of gears by the cooling and lubricating system of the speed reducer 10, and the valve can be used for controlling the flow rate of the increased liquid outlet so as to increase the liquid level of the lubricating oil in the speed reducer housing 100, thereby ensuring the sufficient lubrication and cooling of the plurality of gears of the speed reducer 10.

When the temperature of the lubricating oil increases or the output torque of the power assembly 2 is smaller, the oil quantity requirement of the cooling and lubricating system of the speed reducer 10 on the lubricating oil is smaller, and the valve can be used for controlling the flow of the reducing liquid outlet. The increased amount of oil stored in the oil reservoir 200 is advantageous in lowering the level of oil in the reducer housing 100, thereby reducing the churning loss of the plurality of gears.

In the embodiment of the application, the valve is arranged for regulating and controlling the flow of the liquid outlet, so that the purposes of controlling the oil storage capacity of the oil storage tank 200 and controlling the oil storage capacity of the reducer housing 100 are achieved, and the power assembly 2 is adapted to different working conditions.

In one embodiment, the output torque of the powertrain 2 is greater than a first predetermined torque value, and a valve is used to control the flow of a fluid to a fluid outlet greater than or equal to the flow of oil collected by the notch 201 of the reservoir 200. The output torque of the power assembly 2 is smaller than a second preset torque value, and a valve is used for controlling the flow of a liquid outlet to be smaller than the flow of lubricating oil collected by the notch 201 of the oil storage tank 200, and the first preset torque value is larger than the second preset torque value.

Wherein, the output torque of the power assembly 2 is larger than a first preset torque value, and the valve is in an open state. Because the flow of the liquid outlet is larger, the liquid outlet amount of the oil storage tank 200 is larger than the liquid inlet amount. The oil level in the oil reservoir 200 decreases and the amount of oil contained in the decelerator housing 100 increases, and one or more gears in the decelerator 10 can be passively lubricated by agitating the oil in the decelerator housing 100. A combination of active and passive lubrication is employed during this condition to adequately cool the plurality of gears of the lubricated retarder 10.

In one embodiment, the level of the lubricant oil stored in one of the oil storage tanks 200 along the gravitational direction is less than or equal to the level of the lubricant oil stored in the reducer housing 100 under the condition that the output torque of the powertrain 2 is greater than the first preset torque value. Helps to raise the liquid level in the reducer housing 100 to achieve passive lubrication of the gears of the reducer 10, thereby improving the lubrication efficiency of the plurality of gears.

Under the working condition that the output torque of the power assembly 2 is smaller than a second preset torque value, the flow of the liquid outlet is smaller. The valve may be in a closed state. The liquid outlet amount of the oil storage tank 200 is smaller than the liquid inlet amount. The amount of the lubricating oil stored in the oil reservoir 200 increases, and the amount of the lubricating oil stored in the decelerator housing 100 decreases. The liquid level of the lubricating oil contained in the decelerator casing 100 is lowered, and the oil stirring loss of the decelerator 10 is reduced.

In one embodiment, the level of the lubricant oil stored in one of the oil storage tanks 200 is greater than the level of the lubricant oil stored in the reducer housing 100 along the gravitational direction under the condition that the output torque of the powertrain 2 is less than the second preset torque value. It is advantageous that one oil reservoir 200 accommodates lubricating oil to lower the liquid level of lubricating oil accommodated in the reduction gear housing 100.

In the embodiment of the application, the valve is used for regulating and controlling the relative flow between the liquid outlet and the notch 201, so that the purpose of regulating the oil storage capacity of the speed reducer shell 100 is achieved, and the power assembly 2 is adapted to working conditions with different loads.

In one embodiment, the temperature parameter of the power assembly 2 is less than or equal to a first predetermined temperature value, and a valve is used to control the flow rate of a fluid outlet to be greater than or equal to the flow rate of the collected lubricating oil in the notch 201 of the oil reservoir 200. The temperature parameter of the power assembly 2 is greater than a second preset temperature value, and a valve is used for controlling the flow rate of a liquid outlet to be smaller than the flow rate of lubricating oil collected by the notch 201 of the oil storage tank 200, and the first preset temperature value is greater than the second preset temperature value.

The temperature parameter may be a lubricant temperature, an ambient temperature, a stator temperature of the drive motor, or a rotor temperature.

And under the working condition that the temperature parameter of the power assembly 2 is smaller than or equal to a first preset temperature value, the temperature of the lubricating oil is lower, and the viscosity of the lubricating oil is higher. The circulation efficiency of the lubricating oil in the decelerator casing 100 is low. Under this condition, the valve is used to control the flow rate of one liquid outlet to be greater than or equal to the flow rate of the lubricating oil collected by the notch 201 of the oil storage tank 200. The amount of the lubricating oil contained in the speed reducer housing 100 increases to realize passive lubrication of gears in the speed reducer 10, and the cooling and lubrication effects of a plurality of gears in the speed reducer 10 are improved.

Under the working condition that the temperature parameter of the power assembly 2 is larger than the second preset temperature value, the temperature of the lubricating oil is higher, the viscosity of the lubricating oil is lower, and the active lubrication efficiency of a plurality of gears in the speed reducer 10 is higher. The active lubrication of the plurality of gears in the speed reducer 10 may meet the cooling lubrication requirements of the plurality of gears in the speed reducer 10. Under this condition, the valve is used to control the flow rate of the liquid outlet to be smaller than the flow rate of the lubricating oil collected by the notch of the oil storage tank 200. The amount of oil contained in the reducer case 100 is reduced to reduce the oil stirring loss of the reducer 10.

In this embodiment, the opening of the valve is adjusted to regulate the relative flow between the liquid outlet and the notch 201, so that the power assembly 2 adapts to the working conditions of different temperature parameters.

In one embodiment, the plurality of gears includes an input wheel 110. An oil reservoir 200 is arranged between the input wheel 110 and the decelerator housing 100 in the radial direction of the input wheel 110.

Wherein the axial direction of the input wheel 110 is parallel to the axial direction of the motor shaft of the drive motor 20. The input wheel 110 is used to receive power transmitted from the driving motor 20. In one embodiment, the direction of gravity is perpendicular to the axial direction of the input wheel 110.

In one embodiment, the speed reducer 10 includes an input shaft. The input shaft is adapted to be fixed to the motor shaft of a drive motor 20. An input wheel 110 is fitted around and fixed to the outer peripheral surface of the input shaft. The power output from the motor shaft is transmitted to an input wheel 110 through an input shaft.

The input wheel 110 is spaced from the reducer housing 100 along the radial direction of the input wheel 110. The oil reservoir 200 is arranged radially along the input wheel 110 in the gap between the input wheel 110 and the reducer housing 100. In the embodiment of the present application, the gap between the input wheel 110 and the reducer housing 100 is fully utilized for placing the oil reservoir 200, which is beneficial to reducing the size of the reducer 10.

Referring to fig. 4, in one embodiment, the width of the slot 201 of one oil reservoir 200 is greater than the thickness of one input wheel 110 in the axial direction of one input wheel 110. The width of the slot 201 refers to the distance between two opposite slot walls of the oil storage slot 200 along the axial direction of the input wheel 110 at the slot 201. The thickness of the input wheel 110 refers to the distance between two end surfaces of the input wheel 110 that are oppositely aligned in the axial direction thereof.

In the embodiment of the present application, the width of the notch 201 of the oil storage tank 200 is larger than the thickness of the input wheel 110, and the larger width of the notch 201 is beneficial for the oil storage tank 200 to receive the lubricating oil thrown out by at least one of the plurality of gears. The increased efficiency of the notch 201 in receiving lubrication helps to quickly reduce the level of lubrication contained within the reducer housing 100, thereby effectively reducing churning losses of the reducer 10.

In one embodiment, a width of one oil reservoir 200 in an axial direction of one input wheel 110 is greater than a thickness of one input wheel 110. The width of the oil reservoir 200 refers to the maximum distance between two opposite tank walls of the oil reservoir 200 along the axial direction of the input wheel 110. In the embodiment of the present application, the width of the oil storage tank 200 is larger, and the volume of the oil storage tank 200 is increased. The oil storage tank 200 can accommodate more lubricating oil, which is beneficial for the oil storage tank 200 to adjust the oil amount of the lubricating oil stored in the reducer housing 100 so as to reduce the oil stirring loss of the reducer 10.

In one embodiment, the plurality of gears further includes an intermediate wheel 120. An oil reservoir 200 is arranged between an intermediate wheel 120 and the decelerator housing 100 in the radial direction of the intermediate wheel 120. The arrangement direction of one oil reservoir 200 and one intermediate wheel 120 intersects with the arrangement direction of one oil reservoir 200 and one input wheel 110.

Wherein the intermediate wheel 120 is drivingly connected to the input wheel 110. The input wheel 110 is for receiving power transmitted from the driving motor 20 and transmitting the power to the intermediate wheel 120. The axial direction of the input wheel 110 is parallel to the axial direction of the intermediate wheel 120.

In one embodiment, one intermediate wheel 120 is aligned with one input wheel 110 in a radial direction of one intermediate wheel 120. The direction in which the intermediate wheel 120 and the input wheel 110 are aligned, the direction in which the oil reservoir 200 and the intermediate wheel 120 are aligned, and the direction in which the oil reservoir 200 and the input wheel 110 are aligned intersect each other.

In the embodiment of the present application, the oil reservoir 200 is arranged in a gap formed between the intermediate wheel 120, the input wheel 110 and the decelerator housing 100. In the application, the gaps between the intermediate wheel 120 and the input wheel 110 and the reducer housing 100 are fully utilized for placing the oil storage tank 200, which is beneficial to reducing the size of the reducer 10.

In one embodiment, the speed reducer 10 includes an intermediate shaft. An intermediate wheel 120 is fitted over and fixed to the outer peripheral surface of the intermediate shaft. An intermediate wheel 120 is engaged with an input wheel 110 in a radial direction of the intermediate wheel 120. The power transmitted from one input wheel 110 is transmitted to the intermediate shaft via an intermediate wheel 120.

In one embodiment, the plurality of gears includes a driven gear and an output wheel, and the speed reducer 10 further includes an output shaft. A driven gear is sleeved and fixed on the intermediate shaft. An output wheel is sleeved and fixed on the output shaft. A driven gear meshes with an output wheel in a radial direction of the output wheel. The power transmitted by the intermediate shaft is sequentially transmitted to the output shaft through the driven gear and the output wheel and is transmitted to the wheel driving half shaft 5 through the output shaft, so that the wheels 3 are driven to rotate.

In one embodiment, a radius of one intermediate wheel 120 is greater than a radius of one input wheel 110. Wherein the engagement direction of the input wheel 110 and the intermediate wheel 120 intersects the direction of gravity.

In one embodiment, one intermediate wheel 120 includes two sides that are oppositely aligned along the direction of gravity. The distance between one input wheel 110 and one intermediate wheel 120 is smaller than the distance between one input wheel 110 and the other intermediate wheel 120 in the direction of gravity. An oil reservoir 200 is arranged between one side of one input wheel 110 facing the other side of one intermediate wheel 120 and the decelerator housing 100 in the direction of gravity. The distance between one side of the intermediate wheel 120 and the lubricant oil accommodated in the housing of the speed reducer is larger than the distance between the other side of the intermediate wheel 120 and the lubricant oil accommodated in the housing 100 of the speed reducer. The oil reservoir 200 is arranged in the gravitational direction on the side of the input wheel 110 facing the lubricating oil accommodated in the reducer housing 100.

In the embodiment of the present application, since the size of the intermediate wheel 120 is larger than that of the input wheel 110, a larger gap exists between the input wheel 110 and the reducer housing 100 along the gravity direction. The oil storage tank 200 is arranged in the gap between the input wheel 110 and the reducer housing 100, which is advantageous for fully utilizing the space in the reducer housing 100 and facilitating the downsizing of the power assembly 2. In addition, the volume of the oil storage tank 200 is increased, and the increase of the oil storage capacity of the oil storage tank 200 can effectively reduce the liquid level of the lubricating oil in the reducer housing 100, thereby reducing the oil stirring loss of the reducer 10.

Referring to FIG. 3, in one embodiment, a radius of an intermediate wheel 120 is greater than or equal to a depth of an oil reservoir 200. Because the oil reservoir 200 and the input wheel 110 are arranged between the intermediate wheel 120 and the reducer housing 100, and the oil reservoir 200 and the input wheel 110 are arranged on the same side of the intermediate wheel 120, in the embodiment of the application, the depth of the oil reservoir 200 is smaller than or equal to the radius of the intermediate wheel 120, which is beneficial to reducing the overall dimensions of the oil reservoir 200, the intermediate wheel 120 and the input wheel 110, and facilitating the miniaturization of the powertrain 2.

Referring to fig. 3, in one embodiment, the distance between the axis of an input wheel 110 and the bottom 202 of an oil reservoir 200 is greater than the distance between the axis of an input wheel 110 and the axis of an intermediate wheel 120, and greater than the distance between the intermediate wheel 120 and the bottom 202 of an oil reservoir 200, along the depth of an oil reservoir 200. Wherein, the axis of the intermediate wheel 120 is arranged between the input wheel 110 axis and the groove bottom 202 along the depth direction of the oil reservoir 200.

In the embodiment of the application, the oil storage tank 200, the intermediate wheel 120 and the input wheel 110 are compactly arranged, the space of the reducer housing 100 is fully utilized, and the miniaturization of the power assembly 2 is facilitated.

In one embodiment, the input shaft of the reducer 10 is rotatably coupled to the reducer housing 100 by a bearing 130. An inner race of one bearing 130 is used to fix the outer peripheral surface of the input shaft, and an outer race of one bearing 130 is used to fix the reducer housing 100. One input wheel 110 and one bearing 130 are arranged at intervals along the axial direction of one input wheel 110. The distance between the axis of the input wheel 110 and the notch 201 of the oil reservoir 200 is greater than the radius of the outer race of one of the bearings 130 in the depth direction of one of the oil reservoirs 200. Wherein the radius of the outer race of one bearing 130 refers to half the outer diameter of the outer race of one bearing 130.

In the embodiment of the present application, a gap between one bearing 130 and the reducer housing 100 along the depth direction of the oil reservoir 200 may also be used to dispose one oil reservoir 200, which is advantageous for increasing the axial dimension of the oil reservoir 200.

In one embodiment, the input shaft of the reducer 10 is rotatably coupled to the reducer housing 100 by two bearings 130. The width of one input wheel 110 is greater than the spacing of the two bearings 130 along the axial direction of one input wheel 110. In the embodiment of the application, the axial dimension of the oil storage tank 200 is larger, and the oil storage tank 200 can accommodate more lubricating oil, which is beneficial for the oil storage tank 200 to adjust the oil quantity of the lubricating oil stored in the reducer housing 100 so as to reduce the oil stirring loss of the reducer 10.

In one embodiment, the distance between the axis of one input wheel 110 and the notch 201 of one oil reservoir 200 is smaller than the radius of the outer ring of one bearing 130 along the arrangement direction of one input wheel 110 and one oil reservoir 200. Wherein the projection of the reservoir 200 along the axis of the input wheel 110 at least partially overlaps the projection of one of the bearings 130. In the embodiment of the present application, the gap between the input wheel 110 and the reducer housing 100 along the depth direction of the oil reservoir 200 is fully utilized, which is advantageous for increasing the depth of the oil reservoir 200.

In one embodiment, the input shaft of the reducer 10 is rotatably coupled to the reducer housing 100 by two bearings 130. The width of one input wheel 110 is smaller than the pitch of two bearings 130 in the axial direction of one input wheel 110. In the embodiment of the present application, the gap between the two bearings 130 along the depth direction of the oil reservoir 200 is fully utilized, which is advantageous for increasing the depth of the oil reservoir 200.

Referring in combination to fig. 3, in one embodiment, the powertrain 2 further includes a motor controller 7. The housing of the motor controller 7 is laminated with the speed reducer housing 100 in the gravitational direction. The opening of one oil reservoir 200 is directed in the direction of gravity toward the motor controller 7. The distance between an oil reservoir 200 and the housing of the motor controller 7 is greater than the distance between an input wheel 110 and the housing of the motor controller 7 in the direction of gravity. In the embodiment of the application, the oil storage tank 200 is disposed at a lower position along the gravity direction than the input wheel 110, which is beneficial to receiving the lubricating oil thrown out by the input wheel 110.

In one embodiment, the distance between an oil reservoir 200 and the housing of the motor controller 7 in the direction of gravity is greater than the minimum distance between an intermediate wheel 120 and the housing of the motor controller 7 and less than the maximum distance between an intermediate wheel 120 and the housing of the motor controller 7. Wherein, the middle wheel 120 includes two sides which are oppositely arranged along the gravity direction, and the minimum distance between the middle wheel 120 and the shell of the motor controller 7 refers to the distance between one side of the middle wheel 120, which is close to the shell of the motor controller 7 along the gravity direction, and the shell of the motor controller 7. The maximum distance between the intermediate wheel 120 and the housing of the motor controller 7 refers to the distance between the other side of the intermediate wheel 120 facing away from the housing of the motor controller 7 in the direction of gravity and the housing of the motor controller 7.

In the embodiment of the application, the oil storage tank 200 is disposed at a lower position along the gravity direction than one side of the intermediate wheel 120, which is beneficial to receiving the lubricating oil thrown out by the intermediate wheel 120. Compared with the other side of the intermediate wheel 120, the oil storage tank 200 is higher along the gravity direction, which is beneficial to ensuring that the liquid level of the lubricating oil contained in the oil storage tank 200 is greater than that of the lubricating oil contained in the reducer housing 100, so that the oil storage tank 200 can realize the function of containing the lubricating oil to reduce the liquid level of the lubricating oil in the reducer housing 100.

In one embodiment, the maximum spacing between one input wheel 110 and the housing of the motor controller 7 in the direction of gravity is less than the maximum spacing between one intermediate wheel 120 and the housing of the motor controller 7. In the embodiment of the present application, a larger gap is formed between the side of the input wheel 110 facing away from the housing of the motor controller 7 and the reducer housing 100 in the gravity direction, so as to accommodate the oil reservoir 200. The arrangement of the components inside the reducer housing 100 is compact, which is advantageous for downsizing the powertrain 2.

Referring to fig. 4, in one embodiment, one oil reservoir 200 includes two axial reservoir walls 203. The two axial groove walls 203 along the axial direction of one input wheel 110 are arranged opposite to each other, and the distance between the two axial groove walls 203 along the axial direction of one input wheel 110 is larger than the distance between any one axial groove wall 203 and the end face of one input wheel 110. Wherein, the projection of the input wheel 110 along the depth direction of the oil reservoir 200 along the input shaft is arranged between the projections of the two axial groove walls 203 along the depth direction of the oil reservoir 200.

In the embodiment of the present application, the distance between each axial groove wall 203 and the input wheel 110 along the axial direction of the input wheel 110 is smaller than the distance between the two axial groove walls 203. The larger spacing between the two axial groove walls 203 increases the volume of the oil reservoir 200, facilitating the oil reservoir 200 to store lubrication oil to reduce the lubrication oil level of the reducer housing 100, thereby reducing churning losses of the reducer 10. In addition, the projection of the input wheel 110 is arranged between the projections of the two axial groove walls 203, which is beneficial for the oil reservoir 200 to receive the lubricating oil thrown out by the input wheel 110.

Referring to fig. 3 and 4, in one embodiment, one oil reservoir 200 includes two connecting channel walls 204, and the two connecting channel walls 204 are arranged opposite to each other. Two connecting groove walls 204 enclose two axial groove walls 203 to form a notch 201. The spacing of the two connecting groove walls 204 along the arrangement direction of the two connecting groove walls 204 is greater than or equal to the radius of one input wheel 110. Wherein the arrangement direction of the two connecting groove walls 204 intersects the axial direction of the input wheel 110.

In the embodiment of the present application, the interval between the two connecting groove walls 204 is larger than the radius of the input wheel 110, and the interval between the two connecting groove walls 204 is larger, so that the volume of the oil storage groove 200 is increased, which is beneficial for the oil storage groove 200 to store lubricating oil so as to reduce the lubricating oil level of the reducer housing 100, thereby reducing the oil stirring loss of the reducer 10.

In one embodiment, the spacing between one of the two connecting groove walls 204 and the speed reducer housing 100 is smaller than the spacing between the other connecting groove wall 204 and the speed reducer housing 100 along the arrangement direction of the two connecting groove walls 204. One connecting groove wall 204 is used for fixedly connecting the reducer housing 100.

The reducer housing 100 includes two radial side walls arranged opposite to each other along the arrangement direction of the two connecting groove walls 204, and the distance between one connecting groove wall 204 and the reducer housing 100 refers to the smallest distance among the distances between the connecting groove wall 204 and the two radial side walls. The distance between one connecting groove wall 204 and one radial side wall is smaller than the distance between one connecting groove wall 204 and the other radial side wall, and the distance between one connecting groove wall 204 and the reducer housing 100 refers to the distance between one connecting groove wall 204 and one radial side wall. Similarly, the distance between the other connecting groove wall 204 and the reduction gear housing 100 is the smallest distance among the distances between the other connecting groove wall 204 and the two radial side walls, respectively.

In the embodiment of the present application, the connecting groove wall 204, which is closer to the decelerator housing 100, of the two connecting groove walls 204 of the oil storage groove 200 is used to fix the oil storage groove 200, so that the operation convenience of fixing the oil storage groove 200 is improved, and the oil storage groove 200 and the decelerator housing 100 can be more stably fixed.

In one embodiment, one of the two axial groove walls 203 in the axial direction of one input wheel 110 is spaced from the speed reducer housing 100 less than the other axial groove wall 203 is spaced from the speed reducer housing 100. One axial groove wall 203 is used for the fixed connection of the reducer housing 100. The axial reducer housing 100 along the input wheel 110 includes two axial side walls that are arranged opposite to each other, and the distance between one axial groove wall 203 and the reducer housing 100 refers to the minimum distance between one axial groove wall 203 and each of the two axial side walls. The distance between the other axial groove wall 203 and the reduction gear housing 100 means the smallest distance among the distances between the other axial groove wall 203 and the two axial side walls, respectively.

In the embodiment of the present application, the axial groove wall 203, which is closer to the decelerator housing 100, of the two axial groove walls 203 of the oil storage groove 200 is used to fix the oil storage groove 200, so that the operation convenience of fixing the oil storage groove 200 is improved, and the oil storage groove 200 and the decelerator housing 100 can be more stably fixed.

Referring to fig. 3, in one embodiment, along the arrangement direction of the two connecting groove walls 204, the distance between one connecting groove wall 204 and the axis of one input wheel 110 is greater than the distance between the other connecting groove wall 204 and the axis of one input wheel 110. Wherein, the distance between one connecting groove wall 204 and the axis of the intermediate wheel 120 is larger than the distance between the other connecting groove wall 204 and the axis of the intermediate wheel 120 along the arrangement direction of the two connecting groove walls 204. One connecting groove wall 204, the other connecting groove wall 204 and the intermediate wheel 120 are sequentially arranged at intervals along the arrangement direction of the two connecting groove walls 204.

In the embodiment of the present application, one connecting groove wall 204 is arranged on one side of the input wheel 110 away from the intermediate wheel 120 along the arrangement direction of the two connecting groove walls 204. The offset of the oil reservoir 200 from the input wheel 110 in a direction away from the intermediate wheel 120, as shown in the lower left of fig. 3, reduces interference of the oil reservoir 200 with the intermediate wheel 120 and facilitates the oil reservoir 200 to receive lubricating oil thrown out of the plurality of gears.

Referring to fig. 3, in one embodiment, the distance between the other connecting groove wall 204 and the axis of one input wheel 110 is greater than the distance between the connecting groove wall 204 and the axis of one input wheel 110 along the depth direction of one oil storage groove 200. In the embodiment of the present application, one connecting groove wall 204 may be used to block the lubricating oil thrown out by the input wheel 110, the intermediate wheel 120 or the output wheel, so as to guide the lubricating oil to the oil storage groove 200, thereby being beneficial to improving the oil collection efficiency of the oil storage groove 200.

Referring to fig. 5, fig. 5 is a front view of a powertrain 2 according to an embodiment of the present application. In one embodiment, the length of the other connecting groove wall 204 is greater than the length of one connecting groove wall 204 in the depth direction of one oil reservoir 200. In the embodiment of the present application, the length of one connecting groove wall 204 is longer than that of the other connecting groove wall 204. The two connecting groove walls 204 are not equal in length, so that the groove bottom 202 of the oil storage groove 200 is inclined at an angle, and the oil storage groove 200 can smoothly discharge lubricating oil according to working conditions.

In addition, the width of the reducer housing 100 at the other connecting groove wall 204 along the depth direction of the oil storage groove 200 is larger than the width of the reducer housing 100 at the one connecting groove wall 204, and the longer length of the other connecting groove wall 204 can fully utilize the gap in the reducer housing 100 to increase the volume of the oil storage groove 200, which is beneficial for the oil storage groove 200 to store more lubricating oil to reduce the lubricating oil level of the reducer housing 100, thereby reducing the stirring oil loss of the reducer 10.

In one embodiment, the length of the other axial groove wall 203 is greater than the length of one axial groove wall 203 in the depth direction of one oil reservoir 200. In the embodiment of the application, the two axial groove walls 203 are not equal in length, so that the groove bottom 202 of the oil storage groove 200 is inclined at an angle, which is beneficial to smoothly discharging lubricating oil from the oil storage groove 200 according to working conditions.

In one embodiment, the spacing of one axial groove wall 203 from one intermediate wheel 120 is greater than the spacing of the other axial groove wall 203 from one intermediate wheel 120 along the axial direction of one intermediate wheel 120. The width of one axial groove wall 203 is larger than the width of the other axial groove wall 203 in the arrangement direction of the two connecting groove walls 204. Wherein, along the axial direction of the intermediate wheel 120, a driven gear is arranged between the end surface of the intermediate wheel 120 facing one axial groove wall 203 and the reducer housing 100. Since the radius of the driven gear is smaller than that of the intermediate wheel 120, the driven gear has a large gap with the decelerator housing 100 along the side of the arrangement direction of the two connecting groove walls 204 toward the oil storage groove 200.

In the embodiment of the present application, the width of one axial groove wall 203 is larger, which is beneficial to fully utilizing the gap between the driven gear and the reducer housing 100, so as to increase the volume of the oil storage tank 200, and is beneficial to the oil storage tank 200 to store more lubricating oil so as to reduce the lubricating oil level of the reducer housing 100, thereby reducing the stirring oil loss of the reducer 10.

In one embodiment, the other connecting groove wall 204 includes a fluid outlet for communicating between the inside and the outside of one of the oil reservoirs 200.

Wherein, the gap between the other connecting groove wall 204 and the reducer housing 100 is larger than the gap between the one connecting groove wall 204 and the reducer housing 100 along the arrangement direction of the two connecting groove walls 204. In the embodiment of the present application, the liquid outlet is disposed on the other connecting groove wall 204, which is beneficial for the oil storage groove 200 to smoothly discharge the lubricating oil according to the working condition. In addition, the liquid outlet faces the intermediate wheel 120 along the arrangement direction of the two connecting groove walls 204, and the liquid outlet is arranged on the other connecting groove wall 204, so that lubricating oil can quickly enter the reducer housing 100 from the oil storage groove 200, and the liquid level of the lubricating oil in the reducer housing 100 can be increased.

In one embodiment, the other axial slot wall 203 includes a liquid outlet. The clearance between the other axial groove wall 203 and the speed reducer housing 100 in the arrangement direction of the two axial groove walls 203 is larger than the clearance between the one axial groove wall 203 and the speed reducer housing 100. In the embodiment of the present application, the liquid outlet is disposed on the other axial groove wall 203, which is beneficial for the oil storage tank 200 to smoothly discharge the lubricating oil according to the working condition.

In one embodiment, an inner diameter of a fluid outlet is smaller than a width of a slot 201 of a reservoir 200 in an axial direction of an input wheel 110. The inner diameter of the liquid outlet is the minimum distance between the center of the liquid outlet and the inner peripheral surface of the liquid outlet. The liquid outlet can be circular, and the inner diameter of the liquid outlet is the diameter of the liquid outlet. The width of the slot 201 of the axial reservoir 200 along the input wheel 110 is the distance between the ends of the two axial reservoir walls 203 facing away from the reservoir bottom 202.

In the embodiment of the application, the inner diameter of the liquid outlet is smaller, which is beneficial to controlling the flow of the liquid outlet. The large width of the notch 201 of the oil reservoir 200 is beneficial for the notch 201 to receive lubricating oil thrown out by the gear of the speed reducer 10.

In one embodiment, the area of one of the fluid outlets is smaller than the area of the slot 201 of one of the fluid reservoirs 200. The area of the liquid outlet is the area of the area surrounded by the inner peripheral surface of the liquid outlet. The area of the slot 201 refers to the area of the area enclosed by the slot 201. In the embodiment of the application, the area of the liquid outlet is smaller, which is beneficial to regulating and controlling the flow of the liquid outlet. The large area of the notch 201 facilitates the notch 201 to receive lubricating oil thrown out of the gear of the reduction gear 10.

In one embodiment, a distance of a fluid outlet from an axis of an input wheel 110 is greater than a maximum distance of a connecting groove wall 204 from an axis of an input wheel 110 along a depth direction of a fluid reservoir 200. Wherein, the maximum distance between one connecting groove wall 204 and the axis of the input wheel 110 along the depth direction of the oil storage groove 200 refers to the distance between one end of one connecting groove wall 204 away from the notch 201 and the input wheel 110.

In the embodiment of the application, the liquid outlet is arranged at the lower part of the oil storage tank 200, which is beneficial to discharging the lubricating oil stored in the oil storage tank 200. And lubricating oil contained in the oil storage tank 200 can be discharged from the liquid outlet to the speed reducer shell 100 under the action of gravity, so that the energy consumption of the power assembly 2 is reduced.

In one embodiment, the other axial groove wall 203 includes a liquid outlet, and the distance between the liquid outlet and the axis of one input wheel 110 along the depth direction of one oil storage groove 200 is greater than the maximum distance between the end of one axial groove wall 203 away from the notch 201 and one input wheel 110. In the embodiment of the application, the liquid outlet is arranged at the lower part of the oil storage tank 200, which is beneficial to discharging the lubricating oil stored in the oil storage tank 200.

Referring to fig. 6, fig. 6 is a front view of a powertrain 2 according to an embodiment of the present application. In one embodiment, the reducer housing 100 includes a circumferential housing 131 and two axial housings 132, with the circumferential housing 131 being aligned between the two axial housings 132 along the axis of one input wheel 110. The two end surfaces of each connecting groove wall 204 are respectively connected to the two axial housings 132 in the axial direction of one input wheel 110, and the two axial housings 132 between the two connecting groove walls 204 in the arrangement direction of the two connecting groove walls 204 are respectively used to form two axial groove walls 203.

Wherein each connecting groove wall 204 includes two end surfaces arranged opposite to each other in the axial direction of the input wheel 110. One end face of one connecting groove wall 204 and one end face of the other connecting groove wall 204 are connected to one axial housing 132. An axial housing 132 between one end face of one connecting groove wall 204 and one end face of the other connecting groove wall 204 is used to form an axial groove wall 203.

The other end face of one connecting groove wall 204 and the other end face of the other connecting groove wall 204 are connected to the other axial housing 132. The other axial housing 132 between the other end face of one connecting groove wall 204 and the other end face of the other connecting groove wall 204 is used to form the other axial groove wall 203.

In the embodiment of the present application, the oil reservoir 200 is formed with two axial housings 132 to form two axial reservoir walls 203. The oil reservoir 200 shares portions of the two axial housings 132 with the reducer housing 100, which is advantageous for cost saving. The width of one oil reservoir 200 along the axial direction of the input wheel 110 is the distance between the two axial shells 132, and the width of one oil reservoir 200 is larger, so that the oil reservoir 200 can be used for receiving and storing lubricating oil, and the liquid level of the lubricating oil in the reducer shell 100 can be reduced, so that the oil stirring loss of the reducer 10 can be reduced.

In one embodiment, one end face of each connecting groove wall 204 is secured to one axial housing 132. A sealing strip is also included between the other end face of each connecting groove wall 204 and the other axial housing 132 along the axial direction of one input wheel 110.

In one embodiment, the sealing strips are fixed to the other end face of the connecting groove wall 204, and the other end face of each connecting groove wall 204 abuts against the other axial housing 132 through one sealing strip.

In one embodiment, the sealing strip is fixed to the other axial housing 132, and the other end face of each connecting groove wall 204 is abutted against one sealing strip to achieve connection between the other end face of each connecting groove wall 204 and the other axial housing 132.

In the embodiment of the present application, different connection manners are adopted between two end surfaces of each connecting groove wall 204 along the axial direction and two axial shells 132. One end face of each connecting groove wall 204 is fixed to one axial shell 132, and the other end face of each connecting groove wall 204 abuts against the other axial shell 132, so that convenience in assembling the speed reducer 10 is improved. In addition, a sealing strip is further included between the other end face of each connecting groove wall 204 and the other axial housing 132, which is helpful for realizing sealing connection between the other end face of each connecting groove wall 204 and the other axial housing 132, and is beneficial for the oil storage groove 200 to accommodate lubricating oil.

In one embodiment, two connecting groove walls 204 are of unitary construction with one axial housing 132. The integrated structure has higher strength and improves the connection stability between the two connecting groove walls 204 and one axial housing 132.

Referring to fig. 6, in one embodiment, each connecting groove wall 204 faces away from one input wheel 110 along a depth direction of one oil reservoir 200 for connecting with the circumferential housing 131. The circumferential housing between one side of the two connecting groove walls 204 in the arrangement direction of the two connecting groove walls 204 serves to form the groove bottom 202 of one oil reservoir 200.

Wherein each of the connecting groove walls 204 includes two side surfaces arranged opposite to each other in the depth direction of the oil reservoir 200. One side surface of one connecting groove wall 204 and one side surface of the other connecting groove wall 204 are connected to the circumferential housing 131. The other side of one connecting groove wall 204 and the other side of the other connecting groove wall 204 are used to form the notch 201 of one oil reservoir 200.

The circumferential housing 131 between one side surface of one connecting groove wall 204 and one side surface of the other connecting groove wall 204 in the arrangement direction of the two connecting groove walls 204 serves to form the groove bottom 202.

In the embodiment of the present application, the oil reservoir 200 is formed with the circumferential housing 131 to form the reservoir bottom 202. The oil reservoir 200 shares a portion of the circumferential housing 131 with the decelerator housing 100, which contributes to cost saving.

In one embodiment, one oil reservoir 200 includes one connecting groove wall 204 and a portion of the circumferential housing 131 is used to form the other connecting groove wall 204. The length of the other connecting groove wall 204 in the depth direction of one oil reservoir 200 is longer than the length of one connecting groove wall 204. As shown in fig. 6, the side edges of the circumferential housing 131 are inclined, one connecting groove wall 204 is connected to the circumferential housing 131, and the circumferential housing 131 on the left side of one connecting groove wall 204 can be used to form the other connecting groove wall 204. The lubricating oil may be contained in a space formed between one connecting groove wall 204, the circumferential housing 131 and the two axial housings 132.

In the embodiment of the present application, the oil storage tank 200 uses a part of the circumferential housing 131 as a connecting groove wall 204, which is beneficial to saving cost.

In one embodiment, a drive motor 20 includes a motor stator having an axis coincident with an axis of an input wheel 110. The radius of the motor stator is greater than the radius of one of the input wheels 110. Wherein the housing of the driving motor 20, one axial housing 132 of the reduction gear 10, and the other axial housing 132 of the reduction gear 10 are sequentially arranged in the axial direction of one input wheel 110. The motor stator is fixed to an inner peripheral surface of a housing of the drive motor 20. The housing of the drive motor 20 is adapted to form a motor receiving cavity with the axial housing 132 for receiving a motor stator, a motor rotor and a motor shaft.

In the embodiment of the present application, since the radius of the motor stator is large, one axial housing 132 is large in size in order to accommodate the motor stator, and one axial housing 132 is also large in size. Because of the smaller radius of one input wheel 110, the input wheel 110 has a clearance in its radial direction with the circumferential housing 131 of the reduction gear 10. The oil reservoir 200 is arranged in the gap between the input wheel 110 and the circumferential housing 131, and makes full use of the internal space of the reducer housing 100, thereby facilitating miniaturization of the power assembly 2.

In one embodiment, the radius of the motor stator is greater than the depth of one oil reservoir 200. Wherein the oil reservoir 200 and the input wheel 110 are radially arranged along the input wheel 110. The oil reservoir 200 and the input wheel 110 are arranged on the same side of the motor stator in the axial direction of the input wheel 110.

In the embodiment of the application, the depth of the oil storage tank 200 is smaller than the radius of the motor stator, which is beneficial to reducing the overall size of the oil storage tank 200 and the input wheel 110, and the oil storage tank 200 is fixed on the reducer housing 100 without additionally increasing or excessively increasing the volume of the power assembly 2, thereby facilitating the miniaturization of the power assembly 2.

In one embodiment, the radius of the motor stator is greater than or equal to the distance of the axis of an input wheel 110 from the bottom 202 of a sump 200 in the depth direction of a sump 200. In the embodiment of the present application, the overall size of the oil reservoir 200 and the input wheel 110 is small, which is convenient for miniaturization of the power assembly 2.

In one embodiment, a maximum dimension of one oil reservoir 200 and one input wheel 110 along a radial direction of one input wheel 110 is less than or equal to a radius of the motor stator. In the embodiment of the application, the overall dimensions of the oil storage tank 200 and the input wheel 110 are smaller, and the installation of the oil storage tank 200 in the reducer housing 100 does not additionally increase the volume of the power assembly 2, thereby facilitating the miniaturization of the power assembly 2.

The power assembly and the electric vehicle for adjusting the oil quantity of the oil storage tank provided by the embodiment of the application are described in detail, and specific examples are applied to the principle and the embodiment of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will vary in specific embodiments and application ranges according to the idea of the present application, the present disclosure should not be construed as limiting the present application in summary.

Claims (15)

1. A powertrain with adjustable lubricating oil level, the powertrain comprising a drive motor and a decelerator, the drive motor being adapted to drive a plurality of wheels of an electric vehicle through the decelerator, the decelerator comprising a decelerator housing and a plurality of gears, the decelerator housing being adapted to receive an oil reservoir and the plurality of gears, wherein:

The one speed reducer shell is used for storing lubricating oil, at least one gear stirs up the lubricating oil stored in the one speed reducer shell in the rotating process of the gear, the oil storage tank is used for collecting lubricating oil thrown out in the rotation process of the at least one gear, and the oil storage capacity of the oil storage tank is smaller than that of the speed reducer shell;

the oil storage tank comprises an oil delivery channel which is used for delivering lubricating oil to the speed reducer shell and adjusting the liquid level of the lubricating oil in the speed reducer shell.

2. The powertrain of claim 1, the one oil delivery passage for regulating a flow of lubricant to the one reducer housing based on an output torque of the powertrain, wherein:

The output torque of the power assembly is larger than or equal to a first preset torque value, and the oil delivery channel increases the flow rate of lubricating oil delivered to the one speed reducer shell;

the output torque of the power assembly is smaller than or equal to a second preset torque value, the oil conveying channel reduces the flow of lubricating oil conveyed to the speed reducer shell, and the first preset torque value is larger than the second preset torque value.

3. The powertrain of any of claims 1-2, wherein the one oil delivery passage is configured to regulate a flow of lubricant to the one reducer housing based on a temperature of the lubricant, wherein:

The temperature of the lubricating oil is smaller than or equal to a first preset temperature value, and the oil conveying channel starts to convey the lubricating oil to the one speed reducer shell;

The temperature of the lubricating oil is larger than a second preset temperature value, the oil conveying channel stops conveying the lubricating oil to the one speed reducer shell, and the second preset temperature value is larger than or equal to the first preset temperature value.

4. A powertrain according to any one of claims 1 to 3, wherein the one oil delivery passage begins to deliver lubricant to or increases the flow rate of lubricant to the one reducer housing during the powertrain driving the one electric vehicle uphill.

5. The powertrain of any of claims 1-4, wherein the one oil delivery passage includes a fluid outlet and a valve for controlling a flow rate of the one fluid outlet based on a condition of the powertrain, the condition of the powertrain including at least one of a temperature parameter including at least one of a temperature of the lubricant, an ambient temperature, a stator temperature of the drive motor, and a rotor temperature, or an output torque.

6. The powertrain of claim 5, wherein:

The output torque of the power assembly is larger than a first preset torque value, and the valve is used for controlling the flow of the liquid outlet to be larger than or equal to the flow of the lubricating oil collected by the notch of the oil storage tank;

The output torque of the power assembly is smaller than a second preset torque value, the valve is used for controlling the flow of the liquid outlet to be smaller than the flow of lubricating oil collected by the notch of the oil storage tank, and the first preset torque value is larger than the second preset torque value.

7. The powertrain of any one of claims 1-6, wherein the plurality of gears includes one input wheel, the one oil reservoir being arranged between the one input wheel and the housing of the reduction gear in a radial direction of the one input wheel, the one oil reservoir comprising:

The two axial groove walls are oppositely arranged along the axial direction of the input wheel, and the distance between the two axial groove walls along the axial direction of the input wheel is larger than the distance between any one of the axial groove walls and the end face of the input wheel;

The two connecting groove walls are arranged oppositely, the two connecting groove walls enclose the two axial groove walls to form the notch, and the interval between the two connecting groove walls along the arrangement direction of the two connecting groove walls is larger than or equal to the radius of the input wheel.

8. The powertrain according to claim 7, wherein a distance between one of the two connecting groove walls and the housing of the speed reducer is smaller than a distance between the other connecting groove wall and the housing of the speed reducer in an arrangement direction of the two connecting groove walls, wherein:

Along the arrangement direction of the two connecting groove walls, the distance between one connecting groove wall and the axis of the input wheel is larger than the distance between the other connecting groove wall and the axis of the input wheel.

9. The locomotion assembly of claim 8, wherein the length of the further connecting groove wall is greater than the length of the one connecting groove wall in the depth direction of the one oil storage groove.

10. The locomotion assembly of claim 8 or 9, wherein the further connecting groove wall comprises a liquid outlet for communicating the inside and the outside of the one oil reservoir, wherein:

the inner diameter of the liquid outlet is smaller than the width of the notch of the oil storage tank along the axial direction of the input wheel;

Along the depth direction of the oil storage groove, the distance between the liquid outlet and the axis of the input wheel is larger than the maximum distance between the connecting groove wall and the axis of the input wheel.

11. The powertrain of any of claims 7-10, wherein the reducer housing includes a circumferential housing and two axial housings, the circumferential housing being arranged between the two axial housings along the one input wheel axis, wherein:

two end faces of each connecting groove wall along the axial direction of one input wheel are respectively connected with two axial shells, and the two axial shells between the two connecting groove walls along the arrangement direction of the two connecting groove walls are respectively used for forming two axial groove walls.

12. The powertrain of claim 11, wherein one side of each of the connecting groove walls facing away from the one input wheel in a depth direction of the one oil storage groove is used to connect the circumferential housing, and the circumferential housing between one side of the two connecting groove walls in an arrangement direction of the two connecting groove walls is used to form a groove bottom of the one oil storage groove.

13. The powertrain of any of claims 1-12, wherein the plurality of gears includes an input wheel and an intermediate wheel, the input wheel meshed with the intermediate wheel in a radial direction of the input wheel, wherein:

the radius of the middle wheel is larger than that of the input wheel and is larger than or equal to the depth of the oil storage groove;

Along the depth direction of the one oil storage tank, the distance between the axis of the one input wheel and the tank bottom of the one oil storage tank is larger than the distance between the axis of the one input wheel and the axis of the one intermediate wheel and the distance between the intermediate wheel and the tank bottom of the one oil storage tank.

14. The powertrain of any of claims 1-13, wherein the one drive motor includes a motor stator, the plurality of gears including one input wheel, an axis of the motor stator coinciding with an axis of the one input wheel, wherein:

The radius of the motor stator is larger than the radius of the input wheel and larger than the depth of the oil storage tank;

The radius of the motor stator is larger than or equal to the distance between the axis of the input wheel and the bottom of the oil storage tank along the depth direction of the oil storage tank.

15. An electric vehicle comprising a wheel, a battery pack and a powertrain as claimed in any one of claims 1 to 14 for receiving power from the battery pack and driving the wheel.