Kabushiki Kaisha F. C. C.

Junichi Nishikawa

Han Hiong Chen

Yoshihiko Ozawa

Katsu Yoshimoto

Kenichiro Isobe

Yuki Kobayashi

Jun Komukai

Satoshi Ota

Naoki Kishimoto

Yuki Aono

A clutch device includes a clutch center holding an output-side rotating plate facing an input-side rotating plate and a plate presser pressing the input-side rotating plate or the output-side rotating plate. The clutch center includes a driven shaft coupling portion coupled with a tip portion of a shaft. The plate presser includes a center cylindrical portion including a center fitting portion slidably fitted to an outer surface of the driven shaft coupling portion and an oil receiver located adjacent to the center fitting portion to receive clutch oil flowing out of the tip portion of the shaft.

Clutch device and motorcycle

A clutch device includes a clutch center holding output-side rotating plates alternately arranged with input-side rotating plates, and a pressure plate movable toward or away from the clutch center. The pressure plate includes pressure-side fitting teeth holding the output-side rotating plates. The clutch center includes center-side fitting teeth holding the output-side rotating plates. In a half-clutch state, a portion of one of the center-side fitting teeth overlap with a portion of one of the pressure-side fitting teeth when seen in the radial directions of an output shaft.

A power transmission device has a pressure member, drive-side clutch plates, driven-side clutch plates, a clutch spring, a separate receiving member, and a back-torque limiting cam. A radially-outside restricting portion restricts radially-outward movement of the receiving memberrelative to the pressure member. This maintains clearance t between a side surfaceof the receiving memberand an inner peripheral wallof a clutch member

Power transmission device

A power transmission device has a pressure member () pressing drive-side clutch plates and driven-side clutch plates against each other or releasing a press-contact force. A clutch spring () urges the pressure member () in a direction so that the clutch plates are pressed against each other. A separate receiving member () is attached to the pressure member (). A back-torque limiting cam reduces press-contact force between the clutch plates when the rotation speed of an output member exceeds the rotation speed of an input member. A rotation restricting portion () restricting rotation, relative to the clutch member (), of the pressure member () that has moved due to activation of the push rod (). A clearance t is maintained between the pair of cam surfaces that constitute the back-torque limiting cam.

A power transmitting apparatus inputs or cuts off rotational power of an input member () to an output member () by press-contacting a plurality of driving-side clutch discs () and a plurality of driven-side clutch discs () with each other or releases them. A clutch housing () includes the driving-side clutch discs (). A clutch member is () connected to the output member (). A pressure member () press-contacts the discs () and discs () with each other or releases the press-contacting force between them. Application of a resisting force, for resisting relative rotation between the clutch member () and the pressure member (), can be attained. A magnitude of the resisting force is set larger than a sticking torque between the discs () and discs ().

Growing community of inventors

Hamamatsu, Japan

Junichi Nishikawa