Abstract: A transmission device includes: a shaft member, in the outer circumferential surface of which is formed a male thread centered about a second axis perpendicular to a first axis of a friction clutch; a screw member has a female thread that meshes with the male thread; an arm reciprocates together with the screw member; a first cam member couples to the arm to regulate the rotation of the screw member and rotates around the first axis; a second cam member has a cam surface that is oriented in the direction of the first axis to oppose a cam surface of the first cam member; and a rolling member is disposed between the two cam surfaces to roll on the two cam surfaces; the first cam member or the second cam member subjects the friction clutch to a force oriented in the direction of the first axis.

Abstract: A transmission device includes: a shaft member, in the outer circumferential surface of which is formed a male thread centered about a second axis perpendicular to a first axis of a friction clutch; a screw member has a female thread that meshes with the male thread; an arm reciprocates together with the screw member; a first cam member couples to the arm to regulate the rotation of the screw member and rotates around the first axis: a second cam member has a cam surface that is oriented in the direction of the first axis to oppose a cam surface of the first cam member; and a rolling member is disposed between the two cam surfaces to roll on the two cam surfaces; the first cam member or the second cam member subjects the friction clutch to a force oriented in the direction of the first axis.