Series-parallel transmission system for hybrid power vehicle

Abstract

The invention discloses a series-parallel transmission system for a hybrid power vehicle. The series-parallel transmission system comprises a power output shaft, a first motor, a second motor, a co-planetary frame, a front planetary gear train and a rear planetary gear train. The power output shaft is sleeved with a front row sun wheel axle sleeved with a rear row sun wheel axle; the first motor and the second motor are parallelly arranged on the two sides of the power output shaft; the co-planetary frame is fixedly connected to one end of the power output shaft; planetary gears of the front planetary gear train and the rear planetary gear train are all mounted on the co-planetary frame; a front row gear ring of the front planetary gear train is used for being connected with an output shaft of an engine; and the first motor and the second motor are engaged with the planetary gears through sun wheels on the front row sun wheel axle and the rear row sun wheel axle to drive the co-planetary frame to rotate. According to the series-parallel power system, the probability of the engine for direct vehicle driving is increased, and the axial length of a power assembly can be greatly decreased.

Description

technical field [0001] The invention relates to hybrid power, in particular to a hybrid transmission system for a hybrid power vehicle. Background technique [0002] The planetary gear mechanism has the characteristics of multiple degrees of freedom, and two more motors are used in the hybrid system to limit its degrees of freedom. The speed and torque of the engine are completely decoupled by the two electric motors, so that the engine operating point can be freely controlled, realizing infinitely variable speed, and maximizing the fuel economy of the hybrid system. [0003] At present, the combination of two or more planetary gear trains is mostly used in the market. Although the use of multiple planetary gear trains makes the structure combination of the hybrid system more free, it also makes the configuration of the hybrid system complex and diverse, and increases the internal power of the system. The complexity and diversity of factors affecting flow direction and syst...

AI Technical Summary

Problems solved by technology

[0007] 3. The system mostly adopts a split-type sealing scheme, and there are multiple sealing rings, which are not only difficult to seal, easy to leak oil, but also difficult to maintain;

[0008] 4. The maximum speed of the two drive motors is low, the peak torque is large, and the cost of the motor is high

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