Abstract: A continuous speed variator including two sets of hydraulically-controlled expandable driving-driven pulleys on parallel shafts with respective driving belts arranged in parallel. The movable parts of the driving pulleys are telescopically mounted on a drive shaft and define a common hydraulic actuating chamber.

Abstract: A continuous metal belt for a pulley drive system with V-grooved pulleys includes a flexible metal loop which acts as a guide for a plurality of drive-transmitting blocks slidable on the loop and retained thereon by respective recesses in the blocks. The recess of each block has two lateral guide walls having at their free ends respective retaining projections with active retaining surfaces which face the loop. A plurality of channel elements are arranged with their bottoms extending between the active surfaces and the loop, and their sides between the lateral guide walls and the edges of the loop, so as to reduce rotational movement of the blocks and prevent damaging contact between the blocks and the loop.

Abstract: An automatic transmission device for vehicles having an automatic transmission ratio variator formed by two expandable pulleys interconnected by a trapezoidal belt, hydraulic fluid under pressure being fed to the pulleys to control the distance between two half-pulleys forming each pulley under control of a valve subjected on two opposed faces to the vacuum in the engine induction manifold and to a fluid pressure dependent upon the speed of the driving pulley respectively. The face of the control valve which is subjected to the said fluid pressure is divided in effect into two separate faces one of which is connected directly to a pressure transducer response to the engine speed and the other of which is connected to the said transducer through a selector valve which may be a solenoid operated in dependence upon the accelerator pedal position.

Abstract: A stepless speed change gear of the type in which a main shaft and a driven shaft have respective pulleys formed by plates of controlled variable separation, interconnected by a vee belt. A drive shaft is housed coaxially within the main shaft and connected at one end through a friction clutch with a driving shaft of an engine, the other end of the drive shaft being connected to the main shaft through a reversing gear including an epicyclic gear train.

Abstract: A vehicle power engine having an overhead camshaft transmits drive to front wheels through a stepless automatic speed change gear of the belt and pulley type, drive being transmitted from the crankshaft to the drive pulley of the speed change gear through a drive shaft extending through a central longitudinal cavity in the camshaft. The front-mounted engine may be located longitudinally or transversely with respect to the longitudinal axis of the vehicle.