VEHICLE TRANSMISSION WITH HILL-HOLDER DEVICE

摘要

A vehicle transmission arrangement for a gearbox is disclosed. It includes a hill-holder device having a releasable unidirectional sprag clutch assembly (48) operatively coupled to the gearbox input shaft (20) for permitting rotation of the gearbox input shaft (20) only in one direction driven by the vehicle engine, locking means are provided for the sprag clutch assembly (48) movable between a locked position wherein rotation of the gearbox input shaft (20) is allowed only in the direction driven by the vehicle engine and an unlocked position wherein the gearbox input shaft (20) can rotate freely in either direction. The unidirectional sprag clutch assembly (48) is connected operatively by connection means to the braking system of a vehicle for causing operation of the unidirectional sprag clutch assembly (48) into its unlocked position on operation of the vehicle's brakes and into its locked position on release of the vehicle's brakes.