Electric vehicle power system with hollow rotor motor and double-gear speed reduction with differential speed

Abstract

The invention discloses an electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed. The electric vehicle power system comprises a hollow rotor brushless direct current motor; a sun wheel hollow rotor of the hollow rotor brushless direct current motor is used as a sun wheel of a first-grade planetary speed reduction gear train and is used for carrying out power input; double-gear speed change is realized through a second-grade planetary speed reduction gear train; the sun wheel hollow rotor is provided with a through central hole, so that an axle shaft conveniently penetrates through the through central hole to carry out power transmission; the combination and separation of two groups of the planetary speed reduction gear trains are realized through driving a gear-shifting shift fork by a gear-shifting motor, so that the conversion of high and low speed ratios is realized; a differential speed function of output is realized through a bevel gear differential mechanism. According to the electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed, disclosed by the invention, high-frequency output of the motor is realized through double-gear speed reduction under different working conditions of the motor; meanwhile, the structure of the motor is optimized, the transmission efficiency is high, the structure is compact, the weight is light and the power system is convenient to mount and arrange.

Description

technical field [0001] The invention relates to a motor power system of an electric vehicle, in particular to a power system of a hollow rotor motor and a differential electric vehicle with a double-speed planetary reduction belt. Background technique [0002] An electric vehicle (BEV) refers to a vehicle that is powered by a vehicle-mounted power supply, drives the wheels with a motor, and meets the requirements of road traffic and safety regulations. [0003] The power system of an electric vehicle is generally composed of a motor, a reducer, a differential and other transmission system components. When the car is running, the electric energy output by the battery is controlled to drive the motor to run, and the torque output by the motor drives the wheels forward or backward through the transmission system. Most of the current electric vehicle power systems use ordinary gear single-stage reduction and differential speed for mechanical transmission. [0004] The motor is ...

AI Technical Summary

Problems solved by technology

However, according to the power index of the vehicle and the output characteristics of the motor, it is often difficult to meet the maximum speed, maximum gradient and acceleration time requirements of the car through a single-stage deceleration. The performance, the power of the motor and the backup power must be designed relatively large, so that the volume and mass of the motor will also increase, and the motor cannot often work near the peak power, resulting in a decrease in the efficiency of the motor

The increase in the size of the motor makes the installation of the motor and the drive axle more complicated. At the same time, the motor is too large to make the ground clearance of the electric vehicle chassis near the drive axle smaller, which affects the vehicle's passability, and the motor has been in poor work for a long time. Under the environment, the life and performance of the motor are greatly affected

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