Patent ID: 11933368
Assignee: KABUSHIKI KAISHA F.C.C.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A clutch device to allow or interrupt 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 to be rotationally driven by rotational driving of the input shaft, the clutch center holding a plurality of output-side rotating plates and being operable to be rotationally driven together with the output shaft, the input-side rotating plates and the output-side rotating plates being alternately arranged; and
a pressure plate movable toward or away from the clutch center and rotatable relative to the clutch center, the pressure plate being operable to press the input-side rotating plates and the output-side rotating plates; wherein
the clutch center includes:
an output shaft holding portion to which the output shaft is coupled;
an outer peripheral wall located radially outward of the output shaft holding portion;
a center-side fitting portion located on an inner peripheral surface of the outer peripheral wall; and
an oil passage at least a portion of which is located in the inner peripheral surface of the outer peripheral wall to guide clutch oil to the center-side fitting portion;

the pressure plate includes:
a plurality of pressure-side cam portions each including at least a pressure-side slipper cam surface from among a pressure-side assist cam surface and the pressure-side slipper cam surface, the pressure-side assist cam surface being operable to generate a force in a direction from 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 plates upon rotation relative to the clutch center, the pressure-side slipper cam surface being operable to cause the pressure plate to move away from the clutch center in order to reduce the pressing force between the input-side rotating plates and the output-side rotating plates upon rotation relative to the clutch center;
a pressure-side cam hole penetrating a portion between adjacent ones of the pressure-side cam portions;
a pressure-side fitting portion located radially outward of the pressure-side cam portions and slidably fitting in the center-side fitting portion; and
a pressure-side recess located radially inward of an outer peripheral surface of the pressure-side fitting portion over the entire outer peripheral surface in movement directions and radially outward of the pressure-side cam portion and overlapping and continuous with the pressure-side fitting portion in a circumferential direction from a portion of the pressure-side recess located radially outward of the pressure-side slipper cam surface, assuming directions in which the pressure plate moves toward and away from the clutch center are the movement directions; and

the pressure-side recess communicates with the oil passage.