TRANSMISSION FOR A HYDRAULIC HYBRID VEHICLE, COMPRISING A PLANETARY GEAR TRAIN LINKED TO A PUMP BY A SPEED REDUCER

摘要

A transmission for a hydraulic hybrid motor vehicle comprising a planetary gear train (30) capable of differential operation comprising a first element (32) linked to a heat engine (34) a second element (40) linked to the drive wheels (22) and a third element (36) linked to a hydraulic pump (64) this transmission (1) further comprising a means for driving the drive wheels (8) by a hydraulic machine (2) characterised in that the link between the third element (36) of the planetary gear train (30) and the hydraulic pump (64) comprises a speed reducer (38 60) that provides when the whole of this train is rotating at the same speed a reduction in the speed of rotation of the pump relative to that of the heat engine (34) that is greater than a value of approximately two.