阅读说明：本技术 一种高转速电驱动桥结构 (High-rotation-speed electric drive axle structure ) 是由 王亚军 王威 石晓翔 于 2021-01-07 设计创作，主要内容包括：本发明属于车辆传动技术领域,具体涉及一种高转速电驱动桥结构。此电驱动桥由电机、行星减速器、差速器组成,其中行星减速器采用内外啮合双星排,包括一个太阳轮、三个内行星轮、三个外行星轮、一个齿圈和一个行星架,动力由太阳轮输入,行星架输出,齿圈固定不动。行星减速器与差速器之间通过一对螺旋伞齿轮连接,实现动力的垂直传递。将电机、行星减速器和差速器进行集成设计,可充分利用电机定子内部空间,有效减小电驱动桥系统体积,同时行星减速器采用强制润滑方式,可有效提升减速器工作可靠性和传动效率。(The invention belongs to the technical field of vehicle transmission, and particularly relates to a high-rotation-speed electric drive axle structure. The electric drive axle consists of a motor, a planetary reducer and a differential mechanism, wherein the planetary reducer adopts an internal and external meshed double-star row and comprises a sun gear, three internal planet gears, three external planet gears, a gear ring and a planet carrier, power is input by the sun gear, the planet carrier is output, and the gear ring is fixed. The planetary reducer is connected with the differential through a pair of spiral bevel gears, so that the vertical transmission of power is realized. Carry out integrated design with motor, planetary reducer and differential mechanism, but make full use of motor stator inner space effectively reduces electric drive axle system volume, and planetary reducer adopts the force-feed lubrication mode simultaneously, can effectively promote reduction gear operational reliability and transmission efficiency.)

1. A high speed electric drive axle construction, said electric drive axle comprising: the device comprises a motor (1), a planetary reducer (2) and a differential (3);

the motor (1) is connected with the planetary reducer (2) through a spline, and the planetary reducer (2) is meshed with the differential (3) through a driving spiral bevel gear (401) and a driven spiral bevel gear (402) to realize vertical power transmission;

the planetary reducer (2) adopts an internal and external meshing double-star row and consists of a sun wheel (203), three internal planet wheels (204), three external planet wheels (205), a gear ring (201) and a planet carrier (202);

the power of the planetary reducer (2) is input by a sun gear (203), the power of the planetary reducer is output by a planet carrier (202), and a gear ring (201) is fixed, so that a reduction ratio of 1-k is realized, wherein k is a characteristic parameter of a planet row and is equal to the ratio of the number of teeth of the gear ring to the number of teeth of the sun gear;

the driven helical bevel gear (402) is mounted on either the left or right axle shaft to accommodate front wheel drive and rear wheel drive.

2. A high speed electric drive axle structure according to claim 1, wherein the driving spiral bevel gear (401) is splined to the planet carrier (202) by means of a spigot fit, the driving spiral bevel gear (401) being supported on the reducer housing (209) by a pair of back-to-back tapered bearings (211);

the cone bearing (211) is subjected to play adjustment through a locking nut (213), meanwhile, the planet carrier (202) is axially limited, and a locking gasket (212) plays a role in preventing looseness of the locking nut (213).

3. The high-speed electric drive axle structure as claimed in claim 1, wherein the planetary reducer (2) adopts a forced lubrication mode, and the oil hole of the flow distribution sleeve (210) between the two conical bearings (211), the oil channel of the driving spiral bevel gear (401), the oil channel of the planet carrier (202) and the oil channel of the reentrant planet gear shaft (206) are communicated in sequence;

the planet wheel shaft (206) is axially and circumferentially positioned by a set screw (207) to ensure that the oil passage of the planet wheel shaft (206) and the oil passage of the planet carrier (202) are always aligned.

Technical Field

The invention belongs to the technical field of vehicle transmission, and particularly relates to a high-rotation-speed electric drive axle structure.

Background

With the active push of national policy and the continuous development of power electronic technology, the electric driving of vehicles has become a necessary trend. The electric drive axle can flexibly realize front wheel drive, rear wheel drive and four-wheel drive through integrating a drive motor, a speed reducer, a differential mechanism and the like into a whole, has the characteristics of serialization, modularization and universalization, has the advantages of strong expansibility, quick disassembly and assembly, suitability for batch production and the like, and becomes one of the main directions of the electric development of the wheeled vehicle. Compared with the scheme of direct drive of the motor and fixed-shaft speed reduction, the scheme of the high-speed motor and the planetary speed reducer has the advantages of compact structure, small size, high transmission efficiency and the like, and is favored by various automobile manufacturers.

Disclosure of Invention

The invention provides a high-rotation-speed electric drive axle structure. The electric drive axle is composed of a motor, a planetary reducer and a differential mechanism, and in order to meet the driving requirement of the whole vehicle, the performance requirement of a drive motor is reduced through reasonable allocation of the transmission ratio of the planetary reducer, and the motor, the reducer and the differential mechanism are subjected to integrated design so as to reduce the volume of the electric drive axle system.

The technical scheme of the invention is as follows: a high speed electric drive axle construction, said electric drive axle comprising: a motor, a planetary reducer and a differential mechanism;

the motor is connected with the planetary reducer through a spline, and the planetary reducer is meshed with the differential through the driving spiral bevel gear and the driven spiral bevel gear to realize vertical power transmission;

the planetary reducer adopts an internal and external meshing double-star row and consists of a sun wheel, three inner planet wheels, three outer planet wheels, a gear ring and a planet carrier;

the power of the planetary reducer is input by a sun gear, the power of the planetary reducer is output by a planet carrier, and a gear ring is fixed, so that a reduction ratio of 1-k is realized, wherein k is a characteristic parameter of a planet row and is equal to the ratio of the number of teeth of the gear ring to the number of teeth of the sun gear;

the driven spiral bevel gear is mounted on the left half shaft or the right half shaft to adapt to front wheel driving and rear wheel driving.

Furthermore, the driving spiral bevel gear is matched with the planet carrier through a spigot and is connected with a spline, and the driving spiral bevel gear is supported on the shell of the speed reducer through a pair of back-to-back conical bearings;

the conical bearing is subjected to play adjustment through the locking nut, the planet carrier is axially limited, and the locking gasket plays a role in preventing looseness of the locking nut.

Furthermore, the planetary reducer adopts a forced lubrication mode, and a flow distribution sleeve oil hole, a driving spiral bevel gear oil duct and a planet carrier oil duct between the two conical bearings are sequentially communicated with each other through a planet wheel shaft;

the planet wheel shaft is axially and circumferentially positioned by the set screws so as to ensure that the planet wheel shaft oil duct and the planet carrier oil duct are always aligned.

The invention has the beneficial effects that:

1. the internal and external meshing double-star row is adopted for speed reduction, so that the transmission ratio of 2-3 is easy to realize, and the motor has great advantages in matching with a medium-high speed motor;

2. the planetary reducer and the motor are designed in an integrated manner, the internal space of the motor stator is fully utilized, the structure is compact, and the overall arrangement of the whole vehicle is convenient;

3. the planetary reducer can adopt a forced lubrication mode, so that the working reliability and the transmission efficiency of the reducer can be effectively improved;

4. the integrated electric drive axle is easy to realize modularization, serialization and universalization, can be quickly disassembled and assembled, and is suitable for batch production.

Drawings

Fig. 1 is a schematic diagram of a transmission scheme of a high-speed electric drive axle according to the present invention.

Fig. 2 is a structural layout diagram of a high-speed electric drive axle according to the present invention.

FIG. 3 is an assembly diagram of the planet carrier of the internally and externally meshed double star row of the present invention.

In the figure: 1-motor, 101-motor rotor shaft, 102-motor end cover, 2-planetary reducer, 201-gear ring, 202-planet carrier, 203-sun gear, 204-inner planet gear, 205-outer planet gear, 206-planet gear shaft, 207-set screw, 208-planet gear bearing, 209-reducer shell, 210-flow distribution sleeve, 211-cone bearing, 212-locking gasket, 213-locking nut, 3-differential, 401-driving spiral bevel gear, 402-driven spiral bevel gear.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the drawings and examples.

Examples

As shown in figure 1, a high-speed electric drive axle consists of a motor 1, a planetary reducer 2 and a differential 3, wherein a motor rotor shaft 101 is connected with a sun gear 203 of the planetary reducer 2 through a spline, and a planet carrier 202 of the planetary reducer 2 is meshed with the differential 3 through a driving spiral bevel gear 401 and a driven spiral bevel gear 402 to realize vertical power transmission.

As shown in fig. 1 and 3, the planetary reducer 2 adopts an internally and externally meshed double planetary gear set, and is composed of a sun gear 203, three inner planetary gears 204, three outer planetary gears 205, a gear ring 201 and a planetary carrier 202, power is input by the sun gear 203, power is output by the planetary carrier 202, and the gear ring 201 is fixed, so that a reduction ratio of 1-k is realized, wherein k is a characteristic parameter of the planetary gear set and is equal to the ratio of the number of teeth of the gear ring to the number of teeth of the sun gear. The gear matching parameters of the internal and external meshing double star rows and the realized transmission ratio are shown in a table 1.

TABLE 1 tooth matching parameters

As shown in fig. 2, the ring gear 201 of the planetary gear set 2 is connected to the motor cover 102 by bolts, so that the ring gear 201 is fixed. The driving spiral bevel gear 401 and the planet carrier 202 are connected through a spigot fit and a spline, and a pair of back-to-back conical bearings 211 are installed between the driving spiral bevel gear 401 and the reducer housing 209, and are used for supporting the driving spiral bevel gear 401 and the planet carrier 202 and simultaneously carrying axial force generated by a spiral bevel gear pair. The tapered bearing 211 is play-adjusted by the lock nut 213, and the lock washer 212 plays a role in preventing the lock nut 213 from being loosened. A flow distribution sleeve 210 is arranged between the two conical bearings 211, and pressure lubricating oil output by an external oil pump enters an oil duct of the planet carrier 202 through an oil inlet hole on the reducer shell 209 and an oil hole of the flow distribution sleeve 210 and then enters a shaft hole of the planet wheel shaft 206, so that each planet wheel bearing 208 is lubricated. The planetary gear shaft 206 is axially and circumferentially positioned by a set screw 207 to ensure that the oil passages of the planetary gear shaft 206 and the planet carrier 202 are always aligned, thereby realizing forced lubrication.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.