Pure electric two-speed transmission

Abstract

The invention provides a pure electric two-speed transmission. The pure electric two-speed transmission comprises an input shaft (1), a reducer (6), an output shaft (7) and a brake (8), and a planetary mechanism which comprises a sun gear (4), a planet gear (3), a gear ring (5) and a planet carrier (2), wherein the planet carrier (2) is fixedly assembled to the input shaft (1), the sun gear (4) is fixedly assembled to the output shaft (7), and the right end of the output shaft (7) is fixedly connected with the reducer (6), the pure electric two-speed transmission is characterized by further comprising a one-way clutch (9), the right end of the output shaft (1) is connected with the left end of the output shaft (7) through the one-way clutch (9), and the gear ring (5) of the planetary mechanism is connected with the brake (8). According to the invention, gears can be shifted only by using one one-way clutch 9 and one brake 8, and one one-way clutch 9 and one brake 8 are only required to be controlled when the gears are shifted, so that the control difficulty is smaller.

Description

technical field [0001] The invention relates to the technical field of pure electric vehicles, in particular to a pure electric two-speed transmission. Background technique [0002] Pure electric vehicles are a kind of clean energy vehicles. With the vigorous promotion of energy saving and emission reduction, pure electric vehicles have become a major development trend. Although the traditional pure electric transmission can meet the needs of functions such as speed regulation of pure electric vehicles. However, since the reducer of the traditional pure electric transmission has a fixed speed ratio, the transmission efficiency of the whole vehicle is low. The pure electric two-speed transmission that increases the gear position to two gears can solve the above-mentioned problem of low transmission efficiency of the whole vehicle. [0003] At present, a common pure electric two-speed transmission, including a planetary mechanism, uses two clutches and two brakes in order to...

AI Technical Summary

Problems solved by technology

However, due to the fixed speed ratio of the reducer of the traditional pure electric transmission, the transmission efficiency of the whole vehicle is low

The pure electric two-speed transmission with increased gears to two gears can solve the above-mentioned problem of low transmission efficiency of the whole vehicle

[0003] At present, a common pure electric two-speed transmission, including a planetary mechanism, uses two clutches and two brakes in order to achieve gear shifting. The problem is that the cost of using two clutches and two brakes is relatively high. In addition, two clutches and two brakes need two sets of control devices to control, and the two sets of control devices need to be controlled at the same time when shifting gears, which is difficult to control

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