Electric drive system of double-gear electric car

Abstract

The invention relates to an electric drive system of a double-gear electric car. The electric drive system is characterized by mainly consisting of an electromotor, a first planet gear row, a second planet gear row, a first brake, a second brake, a duplicate gear, a main reducing pinion, a main reducing big gear, a parking brake part, a differential mechanism and a shell; and the first duplicate gear row and the second duplicate gear row are connected through the duplicate gear. The electric drive system has the advantage that the transmission ratio adjustment range is large; the brake part adopts a structure that the first brake and the second brake are nested from inside to outside; gear switching is realized by alternating braking; besides, the parking brake part adopts a differential gear train for parking, so locking of the car can be realized by virtue of a relatively small torque. The electric drive system provided by the invention has two forward gears, two reverse gears and one neutral gear, is also high in transmission efficiency, compact in structure and simple in a gear switching method, provides a new reference scheme for an existing power transmission system structureof the electric car and realizes a relatively good use value and application prospects.

Description

technical field [0001] The invention belongs to the field of electric vehicle drive, and in particular relates to a two-speed electric vehicle electric drive system. Background technique [0002] With the gradual reduction of petroleum non-renewable energy sources, electric vehicles will replace fuel vehicles will definitely be the development trend of the future automotive field. The fixed transmission ratio transmission in the existing electric vehicle power system has high requirements on the motor, and it is difficult to meet the driving requirements of the vehicle in complex road conditions such as steep slopes in mountainous areas. For this reason, the development of electric vehicle transmissions with multi-speed transmission requirements is an important prerequisite for the promotion of electric vehicles. Considering that the electric motor has a large torque adjustment range and the overall volume limit of the electric vehicle power, two-speed transmission is usual...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high energy consumption of the existing electric vehicle single transmission, large difference in transmission ratio between high and low gears in the automatic transmission, and difficulty in shifting, the present invention designs high and low gears based on the transmission characteristics of the planetary gear train and considering actual working conditions. With a reasonable two-speed electric vehicle electric drive system, it is a beneficial supplement to the existing electric vehicle transmission

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