Double-speed transmission for electric automobile

Abstract

The invention discloses a double-speed transmission for an electric vehicle, which comprises a first planetary gear set, a second planetary gear set, a differential mechanism, a first brake and a second brake, and is characterized in that the first planetary gear set comprises a first sun gear, a first planetary gear carrier and a first annular gear ring which are distributed from inside to outside; the first sun gear is used for being connected with a driving shaft of a driving motor, the second planetary gear set comprises a second sun gear, a second planetary gear carrier and a second annular gear ring which are distributed from inside to outside, and the second annular gear ring is used for being connected with a differential mechanism; wherein the first annular gear ring is fixedly connected with the second planetary gear carrier, the first planetary gear carrier is fixedly connected with the second sun gear, the first planetary gear carrier is connected with the first brake, and the second planetary gear carrier is connected with the second brake. The gear shifting mechanism is simple in structure, low in manufacturing cost, high in gear shifting speed and high in transmission efficiency, and is very suitable for being used in the electric automobile.

Description

technical field [0001] The invention relates to a transmission, in particular to a two-speed transmission for an electric vehicle. Background technique [0002] Due to the very wide output speed of the drive motor and the extremely fast driving response speed of electric vehicles, traditional gearboxes are no longer suitable for electric vehicles. At present, most electric vehicles use a single-stage reduction mechanism as the transmission structure, but this method is a compromise choice based on the characteristics of the drive motor's wide speed range, extremely fast response speed, and high work efficiency. This single-stage deceleration mechanism also has certain disadvantages, including that the top speed of electric vehicles is usually not high (generally only up to 140-200KMH, which is far lower than that of fuel vehicles with the same power), and the acceleration performance at medium and high speeds is poor (after the speed reaches a certain The torque drops a lot...

AI Technical Summary

Problems solved by technology

This single-stage deceleration mechanism also has certain disadvantages, including that the top speed of electric vehicles is usually not high (generally only up to 140-200KMH, which is far lower than that of fuel vehicles with the same power), and the acceleration performance at medium and high speeds is poor (after the speed reaches a certain The torque drops a lot), and the energy consumption of medium and high speed driving is high (after the speed reaches a certain condition, the actual usable capacity of the battery is greatly reduced due to the large discharge current of the battery)

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