Abstract: A double clutch structure for connecting an input shaft to an output shaft while always maintaining a predetermined driving torque therebetween includes first and second clutches adapted to selectively connect the input shaft to the output shaft. An engaging structure is movable in a first direction to engage the first clutch and disengage said second clutch. The engaging structure is movable in a second direction to disengage the first clutch and engage the second clutch. A first Belleville spring reacts between the engagement structure and the first clutch for applying a clutch engaging pressure to the first clutch when the engagement structure is moved in the first direction. Similarly, a second Belleville spring reacts between the engagement structure and the second clutch for applying a clutch engaging pressure to the second clutch when the engagement structure is moved in the second direction.

Abstract: A braking facility is described for a four wheel drive vehicle having front and rear axles with front and rear pairs of wheels, an engine driving the rear wheels and also connectable to the front wheels via a four wheel drive clutch, and left and right hand brakes on the rear axle operated by a main brake actuating system. The braking facility includes a hand brake lever which operates the left and right rear brakes via a system independent from the main brake actuating system. It also includes a sensor associated with the hand brake lever and arranged to engage automatically the four wheel drive clutch when the hand brake is operated to provide a hand brake lever operated braking facility connected to all four wheels which is independent of the main brake operating system and which is operable when the vehicle is in motion.