Single planet-row two-shift automatic transmission for electric automobile

Abstract

The invention discloses a single planet-row two-shift automatic transmission for an electric automobile. The automatic transmission comprises a casing. The casing is internally provided with a driving gear connected to a driving motor, a driven gear engaged with the driving gear, and an intermediate shaft fixedly connected to the driven gear. The intermediate shaft is provided with a planetary gear mechanism. The planetary gear mechanism comprises a sun gear fixedly connected to the intermediate shaft, a planetary gear engaged with the sun gear, a planetary gear holder, and a gear ring engaged with the planetary gear. The planetary gear holder is provided with an output shaft, and a clutch is arranged between the output shaft and the sun gear or the intermediate shaft. The casing is also provided with a brake used for braking the tooth ring. According to the invention, the electromagnetic brake and the electromagnetic clutch are employed in the single planet-row two-shift automatic transmission, so that demands on the performance of the driving motor are reduced, the operation efficiency of the motor is improved, and the driving range of the electric automobile is increased.

Description

technical field [0001] The invention belongs to the field of transmissions, in particular to a single-planetary two-speed automatic transmission for electric vehicles. Background technique [0002] As a green and environmentally friendly new energy vehicle, electric vehicles have received more and more attention, and their product categories have become more and more abundant. The transmission system with high-speed motor and fixed gear has the advantages of smooth operation and no power interruption. However, the single fixed gear used in existing electric vehicles is not conducive to the high-efficiency operation of the drive motor, and has higher performance requirements for the motor. In addition, the high-speed motor is equipped with a fixed gear transmission system, and its parallel shaft transmission is large in size, which is not conducive to assembly; it uses a synchronizer as a shift actuator, which will cause problems such as power interruption and shift shock. O...

AI Technical Summary

Problems solved by technology

The transmission system with high-speed motor and fixed gear has the advantages of smooth operation and no power interruption. However, the single fixed gear used in existing electric vehicles is not conducive to the high-efficiency operation of the drive motor, and has high performance requirements for the motor.

In addition, the high-speed motor is equipped with a fixed gear transmission system, and its parallel shaft transmission is large in size, which is not conducive to assembly; it uses a synchronizer as a shift actuator, which will cause problems such as power interruption and shift shock. Oil leakage problems are inevitable with hydraulic clutches and brakes

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