A power system for two-speed transmission of an electric vehicle

Abstract

The invention relates to a two-gear speed changing power system of an electric automobile. The two-gear speed changing power system comprises a driving motor, a differential mechanism, a right half shaft and a left half shaft, and further comprises a planetary gear speed reducing mechanism, a synchronizer and two sets of wheel rim speed reducing mechanisms, wherein the planetary gear speed reducing mechanism and the synchronizer are located in a shell of the driving motor to form an integrated structure. The two-gear speed changing power system has extremely high integration degree; the wheel rim speed reducing mechanisms are used as the final stage of a transmission chain of a main speed reducing mechanism so that the load of the front-stage part of the transmission chain is greatly reduced and the part size of the front-grade part of the transmission chain is reduced, and a miniaturization and light-weight principle is met; a rotor rotary shaft of the driving motor is directly connected with a speed changer gear so that coaxial tolerance caused by matched installation is avoided; the quantities of duplex planetary gears and differential mechanism driving gears are the same and the duplex planetary gears and the differential mechanism driving gears are arranged around the central line at equal angles; the whole structure is centrally symmetrical, the weight distribution is uniform, the dynamic balance property is good, the transmission efficiency is higher, and the vibration noise condition is better.

Description

technical field [0001] The invention belongs to the electric drive technical field of electric vehicles, and in particular relates to a two-speed transmission power system assembly of an electric vehicle. Background technique [0002] Due to the advantages of energy saving, environmental protection, and suitability for urban road conditions, the development of electric vehicles has attracted widespread attention. Most of the existing electric drive solutions for electric vehicles are improved from the drive system of fuel vehicles: replace the motor with the engine, connect the motor to the transmission shaft and then connect it to the drive axle through the gearbox. This design has small changes and good inheritance, but it has many disadvantages such as loud noise, strong vibration, long transmission chain, low transmission efficiency, and bulky structure. Therefore, with the continuous development of the electric vehicle industry, the electric drive system design specifi...

AI Technical Summary

Problems solved by technology

[0005] The first-speed reducer is used in the mechanical transmission part of the electric vehicle drive motor structure with a built-in differential subtraction assembly, so that the working efficiency of the motor is low, and the impact on the battery is also large, which affects battery life and poor starting performance. , high motor speed at high speeds causes noise and cooling issues

[0006] In the structure of a 2+1 gear transmission for electric vehicles, the motor still needs to be installed through couplings and other components, and the degree of integration is low. The transmission structure adopts fixed shaft gear transmission, and the overall installation size is relatively large.

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