Inter-axle power distribution device for fixed-axle hybrid electric vehicle

Abstract

The invention relates to an inter-axle power distribution device for a fixed-axle hybrid electric vehicle. The inter-axle power distribution device comprises a first input shaft, a second input shaft, a first output shaft, a second output shaft and an intermediate shaft. The first input shaft, the second input shaft, the first output shaft and the second output shaft are in transmission connection with the intermediate shaft through gear pairs respectively. The first input shaft and the second input shaft are in drive connection with the intermediate shaft through a constant ratio. The first output shaft and the second output shaft are in drive connection with the intermediate shaft through a constant ratio. At least two exclusive switchable ratios and at least one neutral are formed among the first input shaft, the second input shaft, the first output shaft and the second output shaft through a synchronous switching mechanism(s) arranged on the first input shaft or / and the intermediate shaft. Compared with the prior art, a low-cost modularized electrization scheme is provided for a four-wheel drive vehicle transmission system, and moreover, functions of the parking power generation and shifting without driving force interrupt are realized, and the working efficiency of a motor is optimized.

Description

technical field [0001] The invention relates to a transmission device for an automobile, in particular to an inter-axle power distribution device for a fixed-axis hybrid electric vehicle. Background technique [0002] The launch of the fourth phase of the national fuel consumption regulations has put forward stricter mandatory requirements on the fuel consumption and emissions of vehicles. Therefore, the urgent technical demand for electrification of the drive train is no longer concentrated in the field of small single-axle drive passenger vehicles. For off-road vehicles driven by double axles, or even large commercial vehicles driven by multiple axles, how to introduce an additional electric motor in a low-cost way on the basis of the existing traditional internal combustion engine power system, so as to replace part or all of it through the electric drive path The driving function of the internal combustion engine is a technical problem that needs to be solved urgently. ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from this that the common P3 scheme in the single-motor fixed-axis hybrid electric vehicle transmission system, that is, the scheme in which the motor and the driving wheel maintain a fixed speed ratio, cannot meet the above-mentioned requirements

Although the P2 scheme, that is, the scheme in which the motor and the internal combustion engine maintain a fixed speed ratio, can meet the above requirements, the problem of power interruption during the shifting process has not been resolved

In addition, for the P2 scheme, the motor is usually arranged between the internal combustion engine and the transmission, and the motor cooling system needs to additionally deal with the adverse effects of internal combustion engine heat

It is obviously not a low-cost solution to meet the above-mentioned requirements by using multiple motors while making up for the shortcomings of the P2 and P3 solutions

[0005] Chinese patents with application numbers 2012104682231, 2014100605930 and 2014103638419 all provide an electromechanical coupling transmission device for a single-motor fixed-axis hybrid electric vehicle. The shaft establishes a power transmission path so that it can have the advantages of P2 and P3 at the same time. For this reason, the shaft system of the existing transmission needs to be modified, at least the shaft system needs to be installed, and there is a problem of high cost of transformation.

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