Two-gear transmission suitable for electric vehicle

Abstract

The invention discloses a two-gear transmission suitable for an electric vehicle. The two-gear transmission comprises a shell, an overrun clutch arranged in the shell, a brake, a first-stage planetary reducer, a main reducing gear and a differential mechanism connected with the main reducing gear; the first-stage planetary reducer comprises an inner gear ring, a sun gear arranged in the center of the inner gear ring, a planet gear arranged between the sun gear and the inner gear ring and a planet carrier; the main reducing gear comprises a driving wheel and a driven wheel, and the driven wheel is connected with the planet carrier of the first-stage planetary reducer; the overrun clutch comprises an inner star wheel and an outer ring, the inner star wheel of the overrun clutch is connected between a motor output shaft and the sun gear of the first-stage planetary reducer; and the brake is connected with the inner gear ring of the first-stage planetary reducer. The two-gear transmission is reasonable in structural arrangement, two-stage speed adjustment can be achieved, the structure is more compact, the using stability and reliability can be effectively guaranteed, the applicability is high, and the practicability is good.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a two-speed transmission suitable for electric vehicles. Background technique [0002] At present, the drive system of electric vehicles is mainly composed of a motor connected in series with a reducer, which is used to reduce speed and increase distance to output greater power. Although the reducer can provide large torque, but the speed ratio is single. During the high-speed operation of the electric vehicle, the motor needs to provide a higher speed to meet the performance requirements of the vehicle; from the characteristics of the motor itself, it can be seen that the motor has a constant torque below the critical speed. Work, above the critical speed, is a constant power output, so the output torque of the motor will be greatly reduced at high speed, which will affect the driving experience of the car. At the same time, the high speed operation will ...

AI Technical Summary

Problems solved by technology

Although the reducer can provide large torque, but the speed ratio is single. During the high-speed operation of the electric vehicle, the motor needs to provide a higher speed to meet the performance requirements of the vehicle; from the characteristics of the motor itself, it can be seen that the motor has a constant torque below the critical speed. Work, above the critical speed is a constant power output, so the output torque of the motor will be greatly reduced at high speed, which will affect the driving experience of the car. At the same time, the high speed operation will cause great loss to the parts of the reducer itself, and it is easy to fail

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