Patent ID: 8640845

Claim:
A clutch driving device comprising: an actuator that is a power source; and an energy applying unit that moves a pivot point along a move path to left or right side of an axial center line of the actuator, and changes a force engaging a clutch in proportion to stroke displacement along the move path by the pivot point, wherein the energy applying unit includes: a lever having a roller inclined cam surface that is left-right symmetric along a direction perpendicular to a longitudinal axis of the axial center line, wherein the move path is formed at the left and right sides of the axial center line of the actuator, and wherein the roller inclined cam surface defines the move path and has a cross section with an incline declined from a predetermined point on the axial center line of the actuator or a cross section with an opposite incline; a moving body moving along the axial center line and converting rotation of the actuator into straight motion to implement a forward movement moving away from the actuator and a backward movement moving toward the actuator, a pair of first and second roller wing arms, wherein the first and second roller wing arms change in a movement distance from the axial center line to the left and right sides of the axial center line in moving along the roller inclined cam surface by the moving body when the distance of the forward-backward movement of the moving body changes, wherein the first and second roller wing arms increase a pressing force for a release bearing for operating the clutch at a lifted height of the lever which is lifted in proportion to the change of the move distance, and wherein the first and second roller wing arms have one end supported by a pivot shaft to be a pivot center and the other end having a roller to be in rolling-contact with the roller inclined cam surface.