Power-interruption-free two-gear variable-speed electric drive axle and electric automobile

Abstract

The invention discloses a power-interruption-free two-gear variable-speed electric drive axle which is mainly composed of a motor, a planetary gear train, a first hydraulic type multi-disc friction clutch, a second hydraulic type multi-disc friction clutch, a main speed reducer assembly, a differential mechanism assembly, a hub assembly and a speed changer shell. A one-way clutch is arranged in the planetary gear train and is connected with the transmission shell; wherein the first hydraulic multi-disc clutch is connected with a sun gear and a planet carrier of the planetary gear train, and the second hydraulic multi-disc friction clutch is connected with a gear ring of the planetary gear train and the transmission shell. The invention further discloses an electric automobile which is driven by the two-gear variable-speed electric drive axle without power interruption, and the two-gear shifting operation without power interruption can be realized by controlling the actions of the first hydraulic multi-disc friction clutch and the second hydraulic multi-disc friction clutch and assisting with the one-way clutch.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to the technical field of electric vehicle transmission, in particular to a two-speed variable speed electric drive axle without power interruption and an electric vehicle. Background technique [0002] At this stage, the production and sales of electric vehicles are increasing day by day, the market share is gradually expanding, and the future development prospects are good. Although compared with internal combustion engine vehicles, electric vehicles have obvious advantages in energy saving and environmental protection, but with the proposal of the carbon peak policy, the energy saving requirements for electric vehicles themselves are getting higher and higher, so the design of efficient drive systems for electric vehicles has attracted more and more attention . [0003] According to the different ways of driving the wheels by the motor, electric vehicles can be divided into elec...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the common centralized drive electric vehicles on the market generally do not have a transmission. Generally, the output torque is increased through a large speed ratio final drive. Since the speed ratio is fixed, the speed cannot be reasonably switched according to the actual driving conditions of the electric vehicle. Ratio, unable to meet the dual requirements of electric vehicles for low-speed driving dynamics and high-speed driving economy

At present, a small number of centralized drive electric vehicles that adopt two-speed transmission often adopt synchronizers and motor active speed regulation methods, but the shifting process inherently has the problem of power loss and interruption caused by the shifting process. In addition, the generated The shock of shifting will also affect the ride comfort of the driver and passengers and the driving performance of the car

Images