Integrated two-speed transmission electric drive assembly system and application method

Abstract

The invention provides an integrated two-speed transmission electric drive assembly system and an application method. The integrated two-speed transmission electric drive assembly system comprises a driving motor, a first brake, a second brake, a double-row planetary gear mechanism and a final reduction drive and differential assembly, wherein the output shaft of the driving motor is connected toa front-row planetary carrier through a spline; a front-row ring gear and a rear-row ring gear are integrated into one; a rear-row sun gear is connected to the front-row planetary carrier; steel plateassemblies of the first brake and the second brake are engaged with a gearbox body; a friction plate assembly of the first brake is engaged with an outer ring gear; the friction plate assembly of thesecond brake is engaged with the extension end of a front-row sun gear; and the output end of a rear-row planetary carrier is connected to the input shaft of the final reduction drive and differential assembly and outputs power to wheels. The integrated two-speed transmission electric drive assembly system decreases the axial dimension of a powertrain and decreases the mechanical noise while reducing the difficulty of the arrangement of a whole vehicle. The integrated two-speed transmission electric drive assembly system is compact in whole structure, small in size and light in weight. The design of two-speed transmission enables a motor to work in an efficient range for a long time so as to improve the power performance and economy of the whole vehicle.

Description

Technical field [0001] The invention relates to the technical field of electric vehicle transmission, in particular to an integrated two-speed variable speed electric drive assembly system and an application method. Background technique [0002] At present, pure electric vehicles on the market mostly use single-stage reduction mechanisms. Despite their simple structure and low cost, they cannot take into account the power and economy of pure electric vehicles. The drive motor cannot always work in the high-efficiency area, which reduces the electric drive assembly. The efficiency of the system. Especially in the low load conditions of starting and maximum speed, the motor is in the low efficiency zone, which seriously affects the battery life and endurance. [0003] The patent with publication number CN102152738A discloses the power integration of the drive motor and the transmission of an electric vehicle. The invention reduces the mechanical noise and vibration by designing the ...

AI Technical Summary

Problems solved by technology

[0002] Most of the currently commercially available pure electric vehicles use a single-stage reduction mechanism. Although its structure is simple and its cost is low, it cannot take into account the power and economy of pure electric vehicles. system efficiency

Especially in the low-load conditions of starting and maximum speed, the motor is in the low-efficiency zone, which seriously affects the life and endurance of the battery

[0003] The patent with the publication number CN102152738A discloses a driving motor and transmission power integration of an electric vehicle. This invention reduces the mechanical noise and vibration by designing the motor front end cover and the transmission housing as a whole, and reduces the overall vehicle load. The difficulty of layout improves the reliability of the electric drive powertrain, but it is still essentially a gear reduction mechanism

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