Abstract: A planetary-type overdrive for motor vehicles in which, when engaged, the sun pinion is fixed relative to the housing by means of a completely disengageable one-way clutch when torque is transmitted from the input shaft to the output shaft. Free-wheeling is achieved when torque is transmitted in the opposite direction. A brake device is coupled between the one-way clutch part joined to the sun pinion and the overdrive housing. When shifting from direct drive to overdrive, the sun pinion is braked before the one-way clutch is engaged, i.e. before its blocking function is established.

Abstract: A gear selector mechanism for automatic transmissions with a gear lever connected to the gearbox and movable in a selector gating for setting the correct gear position. The selector gating is connected to the gearbox in such a manner that the movements of the gearbox are transmitted uniformly to the gear lever and the gating, whereby their relative positions remain unchanged.

Abstract: An overdrive for motor vehicles is disclosed which comprises a planetary carrier joined to an input shaft, a ring gear with internal teeth, said ring gear engaging planet pinions carried on the planet carrier and being joined to an output shaft, and a sun pinion engaging the planet pinions. A one-way clutch is disposed between the housing of the overdrive and the sun pinion and is arranged to lock the sun pinion to the housing when driving torque is transmitted from the input shaft to the output shaft. A second clutch is disposed to lock the sun pinion to the ring gear when engaged, the one-way clutch having a control which cooperates with an operator for the second clutch to suspend the blocking function of the one-way clutch before the second clutch is engaged.