阅读说明：本技术 一种电驱动总成 (Electric drive assembly ) 是由 何志良 周映双 周荣 龚政 毕望达 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种电驱动总成,包括电机、电机控制器以及减速器,所述电机包括定子外壳、定子组件、转子组件以及电机轴,所述减速器包括减速器壳体、输入轴以及齿轮组,所述电机轴和减速器的输入轴为同一根空心轴,所述减速器壳体中设有与空心轴的一端相连通的连接油道,减速器壳体上设有油泵,油泵的出口与连接油道相连通,所述空心轴的另一端通过设在定子外壳中的定子外壳油道与减速器壳体的内腔相连通。将减速器输入轴和电机轴整合为一根空心轴,提升电驱总成NVH性能,空心轴形成油道冷却,结合水冷循环冷却,其冷却效果好能有效避免温度过高导致永磁体抗退磁性能下降,从而保证电驱动总成运行性能以及运行的稳定性。(The invention discloses an electric drive assembly, which comprises a motor, a motor controller and a speed reducer, wherein the motor comprises a stator shell, a stator assembly, a rotor assembly and a motor shaft, the speed reducer comprises a speed reducer shell, an input shaft and a gear set, the motor shaft and the input shaft of the speed reducer are the same hollow shaft, a connecting oil duct communicated with one end of the hollow shaft is arranged in the speed reducer shell, an oil pump is arranged on the speed reducer shell, an outlet of the oil pump is communicated with the connecting oil duct, and the other end of the hollow shaft is communicated with an inner cavity of the speed reducer shell through a stator shell oil duct arranged in the stator shell. The input shaft and the motor shaft of the speed reducer are integrated into a hollow shaft, the NVH performance of the electric drive assembly is improved, the hollow shaft forms an oil passage for cooling, and the cooling effect is good by combining water-cooling circulating cooling, so that the reduction of the demagnetization resistance of the permanent magnet caused by overhigh temperature can be effectively avoided, and the running performance and running stability of the electric drive assembly are ensured.)

1. The utility model provides an electric drive assembly, includes motor, motor controller and reduction gear, the motor includes stator housing, stator module, rotor subassembly and motor shaft, the reduction gear includes reduction gear casing, input shaft and gear train, its characterized in that: the motor shaft and the input shaft of the speed reducer are the same hollow shaft, a connecting oil duct communicated with one end of the hollow shaft is arranged in the speed reducer shell, an oil pump is arranged on the speed reducer shell, an outlet of the oil pump is communicated with the connecting oil duct, and the other end of the hollow shaft is communicated with an inner cavity of the speed reducer shell through a stator shell oil duct arranged in a stator shell.

2. An electric drive assembly as recited in claim 1, wherein: the motor controller is internally provided with a motor controller water channel, the stator shell is internally provided with a stator shell water channel, and the motor controller water channel is communicated with the stator shell water channel.

3. An electric drive assembly as claimed in claim 1 or 2, wherein: and one end of the reducer shell corresponding to the hollow shaft is provided with an end oil passage, and the connecting oil passage is an internal oil passage which is arranged in the reducer shell and used for connecting the end oil passage and an outlet of the oil pump.

4. An electric drive assembly as recited in claim 2, wherein: and a stator shell water channel and a stator shell oil channel in the stator shell are arranged in parallel.

5. An electric drive assembly as recited in claim 2, wherein: the motor controller is provided with a motor controller water inlet corresponding to the motor controller water channel, the stator shell is provided with a motor rear end cover, the motor rear end cover is internally provided with an end cover water channel communicated with the stator shell water channel, and the motor rear end cover is provided with a water outlet pipe communicated with the end cover water channel.

6. An electric drive assembly as recited in claim 5, wherein: and a rear end cover plate is arranged on the outer side of the rear end cover of the motor, and an end cover oil duct for communicating the other end of the hollow shaft with the stator shell oil duct is arranged in the rear end cover of the motor and the rear end cover plate.

7. An electric drive assembly as recited in claim 5, wherein: and the flow direction of cooling water of the stator shell water channel is opposite to the flow direction of oil in the stator shell oil channel.

8. An electric drive assembly as recited in claim 5, wherein: the speed reducer casing comprises a speed reducer front end cover and a speed reducer rear end cover which are matched, a speed reducer cavity is formed between the speed reducer front end cover and the speed reducer rear end cover, the speed reducer front end cover is matched with one end of a stator shell, and a motor cavity is formed among the stator shell, the speed reducer front end cover and the motor rear end cover.

9. An electric drive assembly as recited in claim 6, wherein: forming an oil circuit circulation in the electric drive assembly, wherein the oil circuit circulation is as follows: oil pump → reducer casing → motor shaft → rear end cap of motor → rear end cap cover → stator housing → cavity of reducer → oil pump.

10. An electric drive assembly as recited in claim 6, wherein: forming a waterway circulation in the electric drive assembly, the waterway circulation: the water inlet of the motor controller → the rear end cover of the motor → the stator shell → the water outlet pipe of the rear end cover of the motor.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to an electric drive assembly.

Background

At present, a pure electric drive assembly is developed towards high integration, and a motor, a motor controller and a speed reducer are integrated into a whole. The integrated form has general integration and high integration, and the general connecting finger part monomer is connected through a bolt and can be detached; the highly integrated fingers share the shell and cannot be simply disassembled into separate parts; some of the NVH problems are typically associated with the spline section dimensional machining errors. The integrated electric drive assembly needs to be designed according to a limited size space, and ensures larger output torque, so that the current density of the motor is increased, the stator winding generates heat seriously, and the internal loss of the motor is increased. The rotor temperature rise is intensified synchronously, and the anti-demagnetization capability is reduced.

The cooling form of the motor mainly comprises air cooling, water cooling and oil cooling, and the air-cooled motor is adopted to ensure the heat dissipation capacity, so that the heat dissipation area needs to be increased, the motor is very large in size, and the cooling efficiency is not high. The water cooling motor is provided with a water channel on the motor shell, the water channel is spiral, S-shaped and the like, and heat inside the motor needs to be transferred to the shell through the iron core and then subjected to heat exchange. The water cooling method can effectively cool the core winding, but the cooling of the inner winding is difficult. The oil cooling motor can cool the end part and the interior of the stator winding through the oil duct design, but the oil stirring loss exists in the rotor running process. The motor function density improves, and motor current increases, and the aggravation that generates heat need guarantee better cooling effect, just can guarantee the stability of operation performance and operation.

Disclosure of Invention

Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide an electric drive assembly so as to achieve the purpose of good cooling effect.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

this electric drive assembly, including motor, machine controller and reduction gear, the motor includes stator shell, stator module, rotor subassembly and motor shaft, the reduction gear includes reduction gear housing, input shaft and gear train, the input shaft of motor shaft and reduction gear is same root hollow shaft, be equipped with the connection oil duct that is linked together with the one end of hollow shaft in the reduction gear housing, be equipped with the oil pump on the reduction gear housing, the export of oil pump is linked together with the connection oil duct, the other end of hollow shaft is linked together through the inner chamber of stator shell oil duct and reduction gear housing who establishes in stator shell.

Furthermore, a motor controller water channel is arranged in the motor controller, a stator shell water channel is arranged in the stator shell, and the motor controller water channel is communicated with the stator shell water channel.

And one end of the reducer shell corresponding to the hollow shaft is provided with an end oil passage, and the connecting oil passage is an internal oil passage which is arranged in the reducer shell and used for connecting the end oil passage and an outlet of the oil pump.

And a stator shell water channel and a stator shell oil channel in the stator shell are arranged in parallel.

The motor controller is provided with a motor controller water inlet corresponding to the motor controller water channel, the stator shell is provided with a motor rear end cover, the motor rear end cover is internally provided with an end cover water channel communicated with the stator shell water channel, and the motor rear end cover is provided with a water outlet pipe communicated with the end cover water channel.

And a rear end cover plate is arranged on the outer side of the rear end cover of the motor, and an end cover oil duct for communicating the other end of the hollow shaft with the stator shell oil duct is arranged in the rear end cover of the motor and the rear end cover plate.

And the flow direction of cooling water of the stator shell water channel is opposite to the flow direction of oil in the stator shell oil channel.

The speed reducer casing comprises a speed reducer front end cover and a speed reducer rear end cover which are matched, a speed reducer cavity is formed between the speed reducer front end cover and the speed reducer rear end cover, the speed reducer front end cover is matched with one end of a stator shell, and a motor cavity is formed among the stator shell, the speed reducer front end cover and the motor rear end cover.

Forming an oil circuit circulation in the electric drive assembly, wherein the oil circuit circulation is as follows: oil pump → reducer casing → motor shaft → rear end cap of motor → rear end cap cover → stator housing → cavity of reducer → oil pump.

Forming a waterway circulation in the electric drive assembly, the waterway circulation: the water inlet of the motor controller → the rear end cover of the motor → the stator shell → the water outlet pipe of the rear end cover of the motor.

Compared with the prior art, the invention has the following advantages:

this electric drive assembly structural design is reasonable, integrates into a hollow shaft with reduction gear input shaft and motor shaft, promotes and drives assembly NVH performance, and the hollow shaft forms the oil duct cooling, cools off the rotor, and its cooling effect can effectively avoid the high temperature to lead to the anti demagnetization performance of permanent magnet to descend to guarantee the stability of electric drive assembly operating performance and operation.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a schematic cross-sectional view of an electric drive assembly of the present invention.

In the figure:

1. the structure of the motor comprises a reducer front end cover, 2 reducer rear end covers, 3 oil pumps, 4 differentials, 5 intermediate shaft gear sets, 6 reducer rear end cover oil ducts, 7 motor shafts, 8 input shaft gears, 9 motor controller inlet ports, 10 motor controllers, 11 motor controller water ducts, 12 stator shells, 1201 stator shell water ducts, 1202 stator shell oil ducts, 13 stator cores, 14 stator windings, 15 permanent magnets, 16 rotor cores, 17 rotation transformers, 18 oil seals I and 19 motor rear end covers, 1901 motor rear end cover oil ducts, 20 rear end cover plates, 2001 cover plate oil ducts, 21 water outlet pipes, 22 oil seals II.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

As shown in fig. 1, the electric drive assembly includes a motor, a motor controller, and a reducer; the motor includes stator housing 12, stator module, rotor subassembly and motor shaft 7, the reduction gear includes reduction gear housing, input shaft and gear train, the input shaft of motor shaft and reduction gear is same root hollow shaft, be equipped with the connection oil duct that is linked together with the one end of hollow shaft in the reduction gear housing, the last oil pump that is equipped with of reduction gear housing, the export of oil pump 3 is linked together with the connection oil duct, the other end of hollow shaft is linked together through the stator housing oil duct of establishing in stator housing and reduction gear housing's inner chamber.

One end of the reducer shell corresponding to the hollow shaft is provided with an end oil passage, and the connecting oil passage is an internal oil passage which is arranged in the reducer shell and used for connecting the end oil passage and an outlet of the oil pump.

The motor controller is internally provided with a motor controller water channel, the stator shell is internally provided with a stator shell water channel, and the motor controller water channel is communicated with the stator shell water channel. A stator shell water channel and a stator shell oil channel in the stator shell are arranged in parallel; the cooling water flow direction of the stator shell water channel is opposite to the oil flow direction of the stator shell oil channel. The heat is taken away through cooling water by carrying out heat exchange through oil and water in the stator shell.

The motor controller 10 is provided with a motor controller water inlet 9 corresponding to the motor controller water channel, the stator shell is provided with a motor rear end cover 19, the motor rear end cover is internally provided with an end cover water channel communicated with the stator shell water channel, and the motor rear end cover is provided with a water outlet pipe 21 communicated with the end cover water channel.

The reducer casing comprises a reducer front end cover 1 and a reducer rear end cover 2 which are matched, a reducer cavity is formed between the reducer front end cover and the reducer rear end cover, the reducer front end cover is matched with one end of a stator shell, and a motor cavity is formed among the stator shell, the reducer front end cover and the motor rear end cover.

The outer side of the motor rear end cover is provided with a rear end cover plate 20, and an end cover oil passage 2001 for communicating the other end of the hollow shaft with the stator shell oil passage is arranged in the motor rear end cover and the rear end cover plate.

Preferred specific examples are:

a middle shaft gear set 5 and a differential mechanism 4 are arranged in a cavity of the speed reducer, one part of a motor shaft is positioned in the speed reducer, and an input shaft gear 8 connected with the middle shaft gear set is arranged on the part of the motor shaft positioned in the speed reducer; the oil pump 3 is arranged at the bottom of the side face of the rear end cover 2 of the speed reducer, and a speed reducer rear end cover oil duct 6 which is communicated with one end of the hollow shaft and an oil pump outlet is arranged in the rear end cover of the speed reducer.

The motor controller is arranged on a stator shell, and a stator core 13, a stator winding 14, a permanent magnet 15 and a rotor core 16 are arranged in the stator shell; one end of the stator shell is connected with the front end cover 1 of the speed reducer, the other end of the stator shell is connected with the rear end cover 19 of the motor, a rear end cover plate 20 is arranged on the outer side of the rear end cover of the motor, the other end of the hollow shaft of the motor penetrates through the rear end cover of the motor to be located in the rear end cover plate, an oil seal I18 and a rotary transformer 17 which are matched with the outer edge of the hollow shaft are arranged in the rear end cover plate, and an oil seal II 22 is arranged between the.

The motor controller 10 is provided with a motor controller water inlet 9, a motor controller water channel 11 communicated with the motor controller water inlet is arranged in the motor controller, a stator shell water channel 1201 in the stator shell 12 is communicated with the motor controller water channel through a water channel in the motor rear end cover, and a water outlet pipe 21 is arranged on the motor rear end cover.

A cover plate oil passage 2001 is arranged in the rear end cover plate 20, a motor rear end cover oil passage 1901 communicated with the cover plate oil passage and the stator housing oil passage 1202 is arranged in the motor rear end cover 19, one end of the stator housing oil passage is communicated with the reducer cavity, and the other end of the stator housing oil passage is communicated with the motor rear end cover oil passage in the motor rear end cover.

The electric drive assembly is integrated by a single-stage speed reducer, a motor and a motor controller, an oil duct and an oil pump are arranged on the rear end cover of the speed reducer, the input shaft of the speed reducer is not matched with a common integrated spline, the input shaft and a motor shaft are the same shaft (hollow shaft), and partial heat of a rotor is taken away through the oil duct; the motor stator shell is formed by adopting a cold extrusion process, and is provided with a water channel and an oil channel which are independent, the water channel and the oil channel of the motor can exchange heat, and the water circulation can take away the heat of the oil channel; the oil returns to the inside of the speed reducer again after being cooled by the rear end cover and the stator shell, and then forms oil circuit circulation through the oil pump. The waterway circulation is formed by a water inlet of the motor controller, a rear end cover of the motor and a motor shell and is consistent with a cooling loop of the traditional motor.

Forming an oil circuit circulation in the electric drive assembly, wherein the oil circuit circulation is as follows: oil pump → reducer casing → motor shaft → rear end cap of motor → rear end cap cover → stator housing → cavity of reducer → oil pump.

Forming a waterway circulation in the electric drive assembly, wherein the waterway circulation is: the water inlet of the motor controller → the rear end cover of the motor → the stator shell → the water outlet pipe of the rear end cover of the motor.

This electric drive assembly structural design is reasonable, integrates into a hollow shaft with reduction gear input shaft and motor shaft, promotes and drives assembly NVH performance, and the hollow shaft forms the oil duct cooling, combines water-cooling circulative cooling, and its cooling effect is good can effectively avoid the high temperature to lead to the anti demagnetization performance of permanent magnet to descend to guarantee the stability of electric drive assembly operating behavior and operation.

The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.

The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without modification.