Patent ID: 6880688

Claim:
A driving force transmitting apparatus comprising: a main clutch for transmitting driving force between a first rotational member and a second rotational member disposed to be rotatable relative to each other; a clutch mechanism for bringing a pilot clutch to a frictionally engaged condition; and a cam mechanism for bringing the main clutch to a frictionally engaged condition when the clutch mechanism operates for bringing the pilot clutch to the frictionally engaged condition, and the cam mechanism including: a pilot cam member; a main cam member; a stopper member, wherein the pilot cam member, the main cam member and the stopper member are relatively rotatable, and a biasing means for biasing the stopper member in a rotational direction for respectively engaging the pilot cam member and the main cam member to the stopper member, wherein a position of the pilot cam member, the main cam member, and the stopper member in a rotational direction is determined depending on a relationship between a biasing force applied to the stopper member by the biasing means and a torque applied to the pilot cam member.