An electric vehicle transmission system

Abstract

The invention provides an electric vehicle transmission system. The electric vehicle transmission system comprises a motor and a speed reducer. The motor is provided with an output shaft. The speed reducer is provided with a box and comprises a planetary gear train and a differential mechanism, wherein the planetary gear train is driven by the output shaft and arranged coaxial with the output shaft, and the differential mechanism is driven through the output end of the planetary gear train to rotate. The central axis of the differential mechanism and the axis of the output shaft are arranged in parallel. The electric vehicle transmission system has the advantages that the planetary mechanism is adopted for the speed reducer input stage, so that vibration force arms are offset mutually, and better smoothness and stability are achieved in the process of high-speed running; the output stage of the speed reducer and the differential mechanism are integrated together, the simple in structure, occupied space is small, the overall structure of the speed reducer is compact, the weight is lighter, and the overall running is smooth and stable.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric vehicle transmission system. Background technique [0002] With the increasing shortage of oil resources and the increasingly bad impact of exhaust emissions on the environment, new energy vehicles (especially pure electric vehicles) have attracted more and more attention. The country has recently issued a number of incentives to further promote electric vehicles. technology development. The drive system of an electric vehicle uses the on-board power supply to drive the motor and transmits the power to the wheels through the reducer to drive the entire vehicle to run. At present, the drive system of an electric vehicle usually consists of a motor and a fixed-ratio parallel-shaft reducer (including a differential) connected to it, and is connected to the wheels through two half shafts. At present, the reduction ratio of the reducer of electric vehicles, especially pu...

AI Technical Summary

Problems solved by technology

At present, the reduction ratio of the reducer of electric vehicles, especially pure electric vehicles, is often between 8 and 12, and generally adopts a two-stage transmission form, which leads to a larger volume and heavier weight of the powertrain; moreover, due to the use of two Stage parallel shaft structure, resulting in a larger center distance of the reducer, a longer vibration arm of the power system, greater vibration of the power assembly during high-speed operation, and affected the smooth operation of the entire transmission system

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