Two-speed automatic gear shifting rear axle driving system for pure electric vehicles

Abstract

The invention discloses a two-speed automatic gear shifting rear axle driving system for pure electric vehicles, comprising a motor and a driving axle device, wherein the driving axle device comprises a driving axle shell, a driving axle input large gear which is fixedly arranged outside the driving axle shell, a main reducing gear differential assembly which is arranged in the driving axle shell and two half axles which are respectively used for driving wheels; and transmission is carried out between the motor and the driving axle device through a two-speed automatic transmission. As integrated improvement is carried out on the basis of a traditional rear axle, the system has gear shifting function and good succession; by means of the gear shifting function, the requirement for the motor can be reduced so as to reduce the manufacturing cost, and at the same time, the operating efficiency of the motor can be effectively improved so as to improve the power performance and the economical efficiency of the pure electric vehicles; and moreover, by adopting the two-speed transmission, the mass center of the whole rear axle driving system is conveniently controlled in the vicinity of the longitudinal axis of a vehicle, so that the influence caused by motor offset to vehicle maneuverability is avoided.

Description

technical field [0001] The invention relates to an automobile power system, in particular to a rear axle drive system of a pure electric automobile. Background technique [0002] As a non-emission, non-polluting, low-energy, environmentally friendly means of transportation, pure electric vehicles are the most ideal means of transportation in the 21st century. [0003] At present, the rear axle drive system of domestic pure electric vehicles generally adopts a reduction device with simple structure, low cost and fixed speed ratio. Due to the fixed speed ratio, to meet the requirements of various driving conditions, this kind of drive system has high requirements on the power and speed of the drive motor, which greatly increases the development cost of the vehicle. At the same time, there is also an unreasonable matching of the drive system. , the disadvantage of being unable to make the drive motor run more in the high-efficiency zone, the energy consumption increases, and t...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a two-speed automatic transmission rear axle drive system for pure electric vehicles. There are technical problems that the rear axle drive system has high requirements on the motor and low motor operation efficiency. In addition, it is also convenient to control the center of mass of the entire rear axle drive system near the longitudinal axis of the vehicle to ensure the handling of the vehicle

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