Electric-drive mechanical variable-speed power transmission system with integrated motor and transmission case

Abstract

The invention provides an electric-drive mechanical variable-speed power transmission system for an electric automobile. The electric-drive mechanical variable-speed power transmission system comprises a vehicle motor (2) and a transmission case (1); an output shaft (27) of the vehicle motor (2) and an input shaft (27) of the transmission case (1) are produced into the same shaft; the output end of an engine base of the motor and a front end cover of the motor are integrated and the transmission case is directly assembled with the output end of the motor. According to the electric-drive mechanical variable-speed power transmission system provided by the invention, the matching among the engine base of the motor, the front end cover of the motor and the transmission case is simplified to the matching between the motor and the transmission case, so that the whole assembly process is simpler and more reliable; and the system is in a integral-type design so that the integral operation performance of the motor is more stable and reliable, the length of the shaft is shortened, the axial space is reduced, the weight is lightened and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission systems, and in particular relates to an electric-driven mechanical variable-speed power transmission system. Background technique [0002] Electric vehicles include pure electric vehicles, hybrid electric vehicles and fuel cell electric vehicles. Its driving motor often adopts AC induction motor and AC permanent magnet motor. [0003] These two kinds of motors can adopt frequency conversion technology to realize stepless speed regulation, so variable speed transmission devices are generally not required on industrial machinery. However, for vehicles with high speed requirements and strong climbing ability, this configuration is difficult to meet the driving requirements of the vehicle. The variable speed ratio gear transmission device can meet the driving requirements of the highest speed and improve the climbing ability of the wheels. [0004] Chinese patent application ...

AI Technical Summary

Problems solved by technology

Although the motor housing at the output end of the adjustable-speed motor in the patent application CN200910061844 is directly fixedly connected with the transmission body of the gear transmission, the motor base and the motor front end cover are split, which has the advantage of making the processing of parts easier The disadvantage is that there are machining errors from the processing of the parts. In the assembly of the two parts, according to the requirements of the assembly process, a certain coaxiality requirement must be met. Otherwise, there will be an air gap between the motor rotor and the stator. The uneven distribution of space will cause the noise and vibration of the motor, which will affect the overall function of the motor, and there will be certain assembly errors in the assembly, and then assembled with other parts, the accumulation of such errors may cause abnormal operation of the motor

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