A transmission mechanism for actuating a friction clutch which can be disengaged against a spring force and is arranged between an internal combustion engine and a manual transmission, which has two lockable elements (11, 16) that are movable toward each other longitudinally to automatically change length to compensate for a clutch wear, characterized in that the first element consists of a spindle coupled to a non-rotatable component of a disengagement mechanism of the friction clutch in a rotationally fixed and axially movable manner, which comprises a steep-pitch external thread, that the second element consists of a nut with a complementary steep-pitch internal thread into which the spindle can be screwed, wherein the pitch of the steep-pitch thread (15, 19) is dimensioned such that no self-locking can occur between the two elements (11, 16), that the nut is arranged in a hollow casing, which is immovably attached to a controlling element of a pneumatic, hydraulic or electro-mechanical clutch actuator, that the casing comprises a radially inward oriented, axis parallel multi-tooth profile over a length that substantially corresponds to the actuation path (S B) of the friction clutch, with which the nut non-rotatably interacts by means of a polygonal collar radially protruding over a cylindrical region of the nut when the friction clutch disengages, that the casing comprises a free region without multi-tooth profile at the end of the actuation path (S B) corresponding to the engaged state of the friction clutch, in which the polygonal collar of the nut is freely rotatable when spring force is applied while the friction clutch is engaged and corresponding to a change in length by an occurred clutch wear, can be moved in the direction of an end stop on the casing when being rotated relative to the spindle. which has two lockable elements (11, 16) that are movable toward each other longitudinally to automatically change length to compensate for a clutch wear, characterized in that the first element consists of a spindle coupled to a non-rotatable component of a disengagement mechanism of the friction clutch in a rotationally fixed and axially movable manner, which comprises a steep-pitch external thread, that the second element consists of a nut with a complementary steep-pitch internal thread into which the spindle can be screwed, wherein the pitch of the steep-pitch thread (15, 19) is dimensioned such that no self-locking can occur between the two elements (11, 16), that the nut is arranged in a hollow casing, which is immovably attached to a controlling element of a pneumatic, hydraulic or electro-mechanical clutch actuator, that the casing comprises a radially inward oriented, axis parallel multi-tooth profile over a length that substantially corresponds to the actuation path (S B) of the friction clutch, with which the nut non-rotatably interacts by means of a polygonal collar radially protruding over a cylindrical region of the nut when the friction clutch disengages, that the casing comprises a free region without multi-tooth profile at the end of the actuation path (S B) corresponding to the engaged state of the friction clutch, in which the polygonal collar of the nut is freely rotatable when spring force is applied while the friction clutch is engaged and corresponding to a change in length by an occurred clutch wear, can be moved in the direction of an end stop on the casing when being rotated relative to the spindle.