Electric driving system based on double-planet-row two-gear transmission

Abstract

The invention discloses an electric driving system based on a double-planet-row two-gear transmission. The electric driving system comprises a shell, a driving mechanism, an output shaft, a double-planet-row gear system, a clutch and a clutch, the double-planet-row gear system comprises a first planet row and a second planet row, a first-planet-row sun gear is connected with a driving motor shaft, a first-planet-row planet carrier is fixedly connected with an output shaft, a first-planet-row inner gear ring is connected with a second-planet-row planet carrier, a second-planet-row sun gear is fixedly connected with the shell, the clutch can selectively connect the output shaft with a second-planet-row inner gear ring, and the brake can enable the second-planet-row planet carrier and the first-planet-row inner gear ring to rotate or brake at the same time; when a first gear is selected, the clutch does not work, and the brake works; when a second gear is selected, the clutch works, and the brake does not work. The electric driving system has few parts and is compact in structure, motor running efficiency is improved, and driving mileage of an electric vehicle is increased.

Description

technical field [0001] The invention relates to the drive field, in particular to an electric drive system based on a dual-planetary two-speed transmission. Background technique [0002] Electric vehicles are new, energy-saving and environmentally friendly vehicles, especially in today's environment with severe air pollution, they have great development potential and broad application prospects. An electric vehicle uses an electric motor to replace the engine of a traditional car. The electric motor can be started with load and can meet the requirements of the car through reasonable configuration, which is a big difference from the engine. It is no longer suitable to use multi-speed transmissions on electric vehicles, but if the variable speed transmission device is cancelled, it will be difficult to meet the requirements of vehicle climbing and high-speed driving, especially for small and medium-sized vehicles, it is necessary to redesign the power of electric vehicles acco...

AI Technical Summary

Problems solved by technology

The layout of the existing two-speed transmissions for electric vehicles mostly adopts the parallel shaft type and the planetary row type. The two-speed transmissions that adopt the parallel shaft type layout usually use synchronizers or clutches to switch gears. If synchronizers, etc. are used to achieve The shifting of the gears has the following disadvantages: it is necessary to install a shift actuator separately, which increases the volume of the drive system, which is not convenient for the layout of the vehicle, and there is a power interruption during the shifting process; Two-speed transmissions, mostly through the combination of clutches or brakes to achieve gear switching, but have the following disadvantages: the shifting actuators are scattered, and the size of the transmission generally makes the drive system not compact enough

Images