Abstract: The friction clutch has on the one hand a clutch engagement device comprising a diaphragm (3) and on the other hand a linkage (80), an actuator (50, 60, 70, 90, 91) for controlling the said linkage, and an adjustment device (10), for compensating for the wear on the friction linings (7) the actuator has an electric motor (50), a mechanical transmission (60) with an input element (51) and an elastic assistance device (70) bearing on a fixed part (91, 66) and on a movable part (61) forming a nut for cooperating with the output shaft (51) of the electric motor, the movable part (61) forms the output element of the mechanical transmission (60) while being able to act on the linkage (80) while the device for taking up wear (10) is mounted inside the declutching device.

Abstract: The steering of a motor vehicle is assisted by a power steering means including a hydraulic distributor which is supplied with pressurized fluid by a pump from a reservoir. The vehicle also has a clutch having hydraulic servo assistance supplied by a servo unit. The distributor of the power steering system and the clutch servo unit are both supplied with hydraulic fluid from the same pump and reservoir, through a distribution unit which is so arranged that the power steering system has first call at all times on the available pressurized fluid. The distributor unit includes a flow distributing valve, fed from the pump and dividing the flow between a main circuit which leads to the steering distributor, and a secondary circuit which leads to the servo unit. A pressure regulating valve is connected to both the main circuit and the secondary circuit so as to regulate the pressure in each of these circuits according to the demand of the power steering system.

Abstract: An actuator for a friction clutch having a diaphragm includes coupling means comprising a first part associated with the clutch actuating linkage, and a second part associated with the actuator proper. The actuator, of the fluid operated type, comprises a main piston working in a main cylinder and defining with it a control chamber. A secondary piston works within the hollow bore of the main piston to define within the latter a wear compensating chamber. The main piston carries a shut-off valve for bringing the control chamber and the wear compensation chamber into communication with each other when the clutch is in its engaged position. The actuator also includes a booster spring for applying additional force to the diaphragm, such that the characteristic of the diaphragm has a positive gradient over the whole travel between the engaged and disengaged positions of the clutch.

Abstract: A motorized gear shift control apparatus for a transmission gearbox of the kind having fixed gear ratios and a neutral position, comprising a first actuator which actuates a receptor element through a linkage having an output element coupled to the receptor element. The receptor element operates the gear shifting apparatus of the gearbox itself. The output element is mounted by means of the receptor element, so as to be moveable in rotary and/or translational movement, and the linkage includes an intermediate element for actuating the output element in response to the action of the first actuator. The output element is adapted so that during its displacement it can intercept and/or transverse a cam or ramp which is moveable in a fixed support. A second actuator is provided for moving the ramp in translational movement.