An actuation mechanism for a clutch, includes: an actuation element designed to be applied with an actuating force and to be shifted in an actuation direction by same; a transfer element designed to carry out a shift in the actuation direction; and a compensation mechanism designed to apply a reinforcing clamping force for the frictionally engaged transfer of the actuating force between the transfer element and the actuation element, when an actuating force is applied to the actuation element. The compensation mechanism has a friction element and a counter surface which are designed to bring about the reinforcing clamping force via a frictional connection when applying the actuating force. The friction element and the counter surface are designed to generate the reinforcing clamping force via a supporting force resulting from a deflection of the actuating force. The reinforcing clamping force has at least the value of the supporting force.

An actuating mechanism for a clutch actuator includes: an actuating element which is designed to be acted on by an actuating force and thereby displaced in an actuation direction, a transmitting element which is designed to carry out a displacement in the actuation direction, wherein a tensioning element is provided between the actuating element and the transmitting element. The tensioning element is designed to generate, for the transmission of the actuating force to the transmitting element, a clamping pressure force which generates a friction force for the transmission of the actuating force. The friction force is configured so as to be capable of transmitting a maximum actuating force.

A clutch unit includes a clutch having a clutch spring, a motor that generates an actuation driving force for actuating the clutch, an output shaft that transfers the clutch reaction force to the clutch and receives an elastic restoring force of the clutch spring as a clutch reaction force, and a spring that inputs an assist force for assisting the actuation driving force to the output shaft. In switching the clutch from an engaged state to a disengaged state, the output shaft receives the assist force before receiving the clutch reaction force, whereas in switching the clutch from the disengaged state to the engaged state, the assist force becomes zero after the clutch reaction force becomes zero.

An actuating device for a motor vehicle, including a housing and a multi-part working piston movable in relation to the housing. The multi-part working piston has a main piston and an adjusting piston, which pistons are formed in a manner movable axially with respect to each other to compensate for wear. A clamping device clamps the main piston and the adjusting piston in relation to each other in order to fix an operative length of the working piston. The main piston and the adjusting piston are partial pistons of the working piston. A shielding element for protecting the actuating device from dirt is arranged on the housing and a partial piston or on a first partial piston and a second partial piston or on an adjusting piston and on the clamping device.

A self-adjusting clutch actuator includes a transmission element displaceable in a displacement direction; and a compensation mechanism having a piston displaceable in the displacement direction of the transmission element. The compensation mechanism allows a first relative displacement (X) of the transmission element relative to the piston in the displacement direction when there is no actuating force in the clutch actuator, and blocks the first relative displacement (X) when an actuating force is introduced into the clutch actuator by bringing a frictional element (4) into contact with a counter-element. The frictional element (4) is designed for a second relative displacement (Y) relative to the counter-element when the first relative displacement (X) is not blocked by the compensation mechanism (22). A translatory mechanism provided between the transmission element (1) and the piston (2) is designed to cause the second relative movement (Y), by the first relative displacement (X) relative to the counter-element.

A clutch device includes a first rotor, a second rotor, a third rotor, at least one bolt, at least one anti-slip member, and a cam mechanism. The first rotor has a first cam surface and a first fitting hole extending in an axial direction. The second rotor has a second cam surface and a second fitting hole. The second cam surface presses the first cam surface in a circumferential direction. The second fitting hole faces the first fitting hole and extends in the axial direction. The third rotor is fixed to the first rotor. The bolt connects the first rotor and the third rotor. The anti-slip member fits into the first and second fitting holes. The cam mechanism includes the first cam surface and the second cam surface, and moves the second rotor in the axial direction when relative rotation occurs between the first rotor and the second rotor.

An electric clutch actuator having a housing, an electric motor, a gear mechanism and a spindle which is coupled to the electric motor via the gear mechanism, wherein the spindle has an output end which acts on a relief piston which is displaceably mounted on a guide piston which is mounted so as to be displaceable in the housing, wherein the relief piston is urged elastically away from the guide piston towards the spindle.

A wear compensation device of a clutch actuator may include a screw movable along a longitudinal direction of a pull-rod axially received in the screw, a screw guider holding the screw to allow movement in the longitudinal direction and having a connection pin connected to a link member, a compensation nut supported by the screw guider, engaged with the screw, and having catching teeth, a compensation ring externally coupled with the compensation nut, having a catching protrusion to be locked with the catching teeth in one direction thereof, and having a guide pin on an external circumference of the compensation ring, and a guide block fixed to a housing, having a guide groove to receive the guide pin, and guiding the guide pin to rotate the compensation ring when the pull-rod is operated to a wear compensation range.

A clutch actuation mechanism for actuating a clutch operator of a spring loaded friction clutch having at least a motor driven rotary disc for being connected to the clutch operator enables to operate the motor with an essentially constant and reduced torque, if a pin is attached to the disc with an offset from the disc's rotary axis, and if a lever has a curved contacting surface and if a spring forces the lever with its contacting surface against the pin to thereby provide an additional torque to the disc. Thus, the pin travels over the contacting surface when the disc rotates to open or close the spring loaded clutch via the clutch operator and the curvature enables to adapt the torque provided by the spring to the torque required to compensate for the clutch spring.

A clutch actuator transmitting a disengaging force to a clutch disengaging device of a includes an actuating element which receives the disengaging force, and a piston rod for transmitting the disengaging force from the actuating element to the disengaging device. The piston rod bears against an actuating element connection region such that the piston rod is movable towards the connection region by the reaction force of the clutch. The positioning of the connection region and the piston rod relative to each other due to the movement can be fixed by applying the disengaging force to the actuating element. The actuating element at least partly deflects the disengaging force, producing a normal force and/or a radial force acting between the connection region and the piston rod. The normal force and/or the radial force fixes the position of the connection region and the piston rod relative to each other.