Clutch device

A clutch device to allow or block transfer of a rotation driving force of an input shaft to an output shaft, the clutch device comprising:

• a clutch center housed in a clutch housing holding a plurality of input-side rotating plates rotationally drivable by rotational driving of the input shaft, the clutch center holding a plurality of output-side rotating plates located alternately with the input-side rotating plates, and being rotationally drivable together with the output shaft;
• a pressure plate movable toward and away from and rotatable with respect to the clutch center, the pressure plate being capable of pressing the input-side rotating plates and the output-side rotating plates;
• and
• a spring held by the clutch center;
• wherein
• the clutch center includes a center-side cam portion including a center-side assist cam surface to generate a force in a direction so as to move the pressure plate toward the clutch center in order to increase a pressing force between the input-side rotating plates and the output-side rotating plate when the clutch center rotates with respect to the pressure plate;
• the pressure plate includes a pressure-side cam portion including a pressure-side assist cam surface to generate a force in a direction so as to move the pressure plate toward the clutch center, in order to increase the pressing force between the input-side rotating plates and the output-side rotating plate when the pressure plate rotates with respect to the clutch center;
• and
• assuming a direction in which the pressure plate moves is a moving direction, a direction in which the pressure plate moves toward the clutch center is a first direction, and a direction in which the pressure plate moves away from the clutch center is a second direction;
• the spring is contactable with the output-side rotating plates held by the clutch center, is located between two output-side rotating plates adjacent to each other in the moving direction among the output-side rotating plates held by the clutch center, and is located on a side of the second direction with respect to a center in the moving direction from a first output-side rotating plate located farthest in the first direction among the plurality of output-side rotating plates held by the clutch center to a second output-side rotating plate farthest in the second direction among the plurality of output-side rotating plates held by the clutch center.