Patent ID: 7674197

Claim:
A Continuously Variable Transmission driven-pulley comprising: an outer sheave; an inner sheave adjacent the outer sheave, the inner sheave having a fully opened position and a fully closed position with respect to the outer sheave; a spring biasing the inner sheave toward the outer sheave, the spring resisting movement of the inner sheave toward the fully opened position in response to torque being applied to the inner sheave; at least one roller assembly, the at least one roller assembly being connected to one of the outer sheave and the inner sheave; a cam, the cam being connected to the other of the inner sheave and the outer sheave, the cam comprising: an axis of rotation; a first helix having a first contact surface, the first contact surface being radially offset from the axis of rotation by a first distance; a second helix having a second contact surface facing toward the first contact surface, at least a portion of the second contact surface being radially offset from the axis of rotation by the first distance, the second contact surface adapted to contact the at least one roller assembly; and a third helix having a third contact surface, the third contact surface being radially offset from the axis of rotation by a second distance, the third contact surface being circumferentially placed between the first contact surface and the second contact surface and facing the first contact surface, the third contact surface adapted to contact the at least one roller assembly, a position of the first, second, and third helixes relative to each other being fixed, the inner sheave being movable relative to the outer sheave between: a first position, wherein the at least one roller assembly is in contact with the first contact surface; a second position, wherein the at least one roller assembly is in contact with the second contact surface; and a third position, wherein the at least one roller assembly is in contact with the third contact surface.