An electric drive system for electric wheels

Abstract

The invention relates to a wheel-rim electric driving system of an electric car. The wheel-rim electric driving system of the electric car comprises a torsional damper, a transmission mechanism and a motor power assembly, wherein the motor power assembly is formed by connecting a motor and a gear retarding mechanism; the motor power assembly is fixedly arranged on a car frame; the torsional damper is connected with the gear retarding mechanism through a flat key; and the transmission mechanism is connected with the torsional damper and wheels respectively. In comparison with the prior art, a motor power system comprising the motor, the gear retarding mechanism, the torsional damper and the like is arranged on a car body in the wheel-rim electric driving system of the electric car, so that the unsprung mass of the traditional distributed type electric car increased by a wheel rim motor and a wheel hub motor can be prevented, the shock caused by the wheel dynamic load to the car body can be decreased and the smoothness of the whole car is improved; through the additional arrangement of the torsional damper, the adverse effects on the electric car caused by the fluctuation of a motor torque can be attenuated, the vibration noise level of the whole car can be reduced and the vehicle control stability can be improved; and as the motor power system is arranged on the car body, a suspension system can be consistent with the traditional car type, no limit of the electric driving system exists and the design difficulty is low.

Description

technical field [0001] The invention relates to an automobile drive system, in particular to an electric wheel drive system capable of reducing unsprung mass and torsional vibration. Background technique [0002] Energy saving, environmental protection and safety have become the themes of contemporary automobile development. The huge challenge of energy security and environmental protection makes the transformation of vehicle energy and power become an important development trend. Therefore, the development of new energy vehicles using electric drive systems has attracted increasing attention from all over the world and has become the focus of technological competition. [0003] At present, the distributed electric drive system of new energy vehicles mainly has two forms: wheel hub motor drive and wheel edge motor drive. The hub motor drive form has a simple structure, and the power system can be integrated with the inside of the wheel. However, due to the increase of the ...

AI Technical Summary

Problems solved by technology

The driving form of the hub motor is simple in structure, and the power system can be integrated with the inside of the wheel. However, due to the increase of the unsprung mass, the ride comfort performance of the vehicle is reduced; in addition, because the torque fluctuation of the motor directly acts on the wheel, it will cause a decrease in the vehicle's handling stability and Cause vibration of the wheel suspension system and excite the noise inside the car

The wheel-side electric drive system arranges the drive motor on the suspension between the wheel and the body to reduce the unsprung mass added by the motor system, but the unsprung mass is still larger than that of a traditional car, and because the suspension system carries the motor system , the load is too large, the working condition is not ideal, and the structural strength and durability are difficult to guarantee

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