Four-speed transmission for hybrid power vehicle

Abstract

The invention provides a four-speed transmission for a hybrid power vehicle. The four-speed transmission is mainly applied to the hybrid power vehicle and can provide four forward gear ratios, the torque and rotating speed range of a motor of the hybrid power vehicle is expanded, and the motor driving speed range is expanded. The transmission comprises an input shaft, an output shaft, a motor output shaft, a first gear selecting assembly, a second gear selecting assembly and four sets of variable-speed gear pairs, wherein the motor output shaft and the input shaft transmit motion and torque through gears (or chain wheels), one of the four sets of variable-speed gear pairs is selected through the gear selecting assemblies to transmit motion and torque, four gear ratios can be obtained between an engine crankshaft and a driving gear, and four gear ratios can also be obtained between the motor output shaft and the driving gear.

Description

technical field [0001] The invention relates to the automobile transmission technology, in particular to a four-speed transmission for a hybrid electric vehicle. Background technique [0002] The driving conditions of the car are complex and changeable, and the driving resistance and driving speed vary greatly. The rolling resistance and wind resistance when moving forward at a constant speed on a straight road are small, but the climbing resistance or acceleration resistance is very high when climbing a steep slope or accelerating rapidly. Large, the required driving force is several times or even ten times different. In addition, the car must meet the requirements of special road sections to crawl slowly at a speed of several thousand kilometers per hour or even slower, and at the same time, it must be able to drive at a speed of more than one hundred kilometers per hour or even faster. Driving at a fast speed requires the drive wheels to run in a fairly wide range of spee...

AI Technical Summary

Problems solved by technology

However, this solution will increase the axial length. Most models adopt the layout of the engine front transversely, and the axial space is very tight. The axial space for adding a motor between the gasoline engine (or diesel engine) and the transmission is small. In addition, the transmission The speed of the input shaft is limited by the gasoline engine (or diesel engine), which cannot give full play to the advantages of high power density of the motor. Therefore, the motor added in this scheme has small power, large volume and heavy weight.

[0004] Although the multi-gear automobile transmission matched with gasoline engine or diesel engine is mature and widely used, it has defects such as complex structure, large volume, heavy weight, and high manufacturing cost, and the driving motor has better torque than gasoline engine (or diesel engine) and speed output characteristics, it is inappropriate for hybrid vehicles to use traditional multi-gear transmissions

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