Abstract: The object of the invention is to provide an automatic clutch control system for coupling two rotating shafts. The system comprises a piston axially movable towards an engaged position to provide the axial clamping of at least one friction disc forming part of a hydraulically controlled clutch mounted between two shafts. A control member responsive to the difference in speed between the shafts moves the piston towards its engaged position and is advantageously constituted by a lobed pump having a central pinion, an inner crown, eccentric relative to the pinion, and an outer crown centered relative to the pinion. The pinion is fixed for rotation on one of the shafts while the outer crown is integral in rotation with the other of the shafts.

Abstract: The invention relates to a belt and pulley transmission which is preferably but not essentially an infinitely variable transmission. The belt is formed from a stack of individual blocks working in compression and supported on one or more support bands. According to the invention, the blocks are formed from sintered metal material, while the bands which support and compress the blocks are made from aramide fibres, such as KEVLAR. Every tenth block is of sintered bronze, to reduce the risk of seizing, the remaining blocks being of sintered iron.

Abstract: A disc brake for installation on heavy automotive vehicles, comprises at least two rotating discs fixed to each other and spaced apart axially and rigidly fixed on the brake rotor, and a stirrup fixed on the brake stator. The stirrup comprises two external portions between which the discs are disposed, and at least one intermediate portion between the discs. The stirrup portions have pairs of opposed coaxial cylinders to apply friction linings against the discs between them. The cylinders of the intermediate stirrup portion open in opposite axial directions and are staggered circumferentially and are blind and have a depth close to the thickness of the intermediate portion. The portions of the stirrup member are detachably interconnected and extend over an angular sector of about 180.degree. at the top of the brake.

Abstract: A constant velocity universal joint for coupling two shafts and for transmitting rotation between the shafts and enabling, independently, transmission of axial thrust between the shafts and/or slight angular displacements of the shafts relative to their axially aligned position. The constant velocity joint comprises two stub shafts adapted to be fixed to the shafts. One of the stub shafts having a cup-shaped end portion with an inwardly extending flange at its open end for mounting a socket member of a ball and socket joint whose toroidal ball member is mounted near the end of the other stub shaft. A first cylindrical sleeve is joined to the cup-shaped end portion of the flange and has an internally toothed gear at its free end meshing with radial clearance with an externally toothed gear at one end of a second cylindrical sleeve coaxial of the first cylindrical sleeve.