Patent ID: 9644709
Date: 2017-05-09
CPC Classifications: B60K,B60W,B60Y,F16H,Y02T,Y10T

Claim:
1. A speed transmission configured to drive an axle which propels at least two wheels of the vehicle of a hybrid type motor vehicle comprising: a primary transmission shaft connected to a thermal engine through a disengaging coupling and which carries at least two primary toothed wheels cooperating with at least two secondary toothed wheels which are carried by a secondary transmission shaft connected to the axle shaft of the vehicle and to an electric machine to form two gear trains with different gear ratios for driving the vehicle at different gear ratios; and wherein one of the secondary toothed wheels is carried by the secondary transmission shaft through a free wheel one-way coupling, and another of the secondary toothed wheels is mounted idle in rotation on the secondary transmission shaft and is connected to the secondary transmission shaft through a centrifugal clutch disengaging coupling and operation of the free wheel coupling and the centrifugal clutch disengaging coupling provides selective connection and disconnection of the at least two primary toothed wheels and the at least two secondary toothed wheels to provide the different gear ratios for obtaining speed variation of the axle shaft to vary the speed of the vehicle; and wherein a first gear ratio is obtained between the thermal engine and the axle shaft through a first gear train including the free wheel coupling and a second gear ratio is obtained between the thermal engine and the axle shaft through a second gear train including the centrifugal clutch disengaging coupling.