Kabushiki Kaisha F. C. C.

Shunichi Itou

Makoto Kataoka

Satoru Kashiwagi

Katsu Yoshimoto

Shinji Furuhashi

A power transmitting apparatus can include a clutch housing rotatable together with an input member and supporting a plurality of driving clutch plates. A clutch member can support a plurality of driven clutch plates alternately arranged between the driving clutch plates via spline fitting and connected to an output member. A pressure member can be mounted on the clutch member and axially movably therealong for carrying out the pressure-contact or release between the driving clutch plates and the driven clutch plates. Back-torque limiting cams can be configured to release the connection between the driving clutch plates and the driven clutch plates when the rotation speed of the output member has exceeded that of the input member. A rotational force input to the input member can be transmitted to or cut-off from the output member by carrying out the pressure-contact or release between the driving clutch plates and the driven clutch plates. The driven clutch plates can be supported by a two-part structure in which some of the driven clutch plates are supported on the clutch member by a spline fitting portion and the other driven clutch plates are supported on the pressure member by a spline fitting portion. The power transmitting apparatus can further comprise a device or assembly configured to preventing slipping-off of the driven clutch plates into a separated portion between the spline fitting portion of the clutch member and the spline fitting portion of the pressure member.

Power transmitting apparatus

A power transmitting apparatus can comprise a clutch housing rotatable together with an input member and supporting a plurality of driving clutch plates. A clutch member can support a plurality of driven clutch plates alternately arranged between the driving clutch plates via spline fitting and connected to an output member. A pressure member can be mounted on the clutch member so as to be axially movable therealong so as to accommodate pressure-contact and release of the driving clutch plates and the driven clutch plates. Back-torque limiting cams can be configured to release the connection between the driving clutch plates and the driven clutch plates when the rotation speed of the output member has exceeded that of the input member. A rotational force input to the input member can be transmitted to the output member by pressure-contacting the driving clutch plates and the driven clutch plates. The power transmitting apparatus can also comprise a limiting device for limiting a movement of the pressure member toward a direction away from the clutch member.

A method for manufacturing a power transmitting apparatus by molding both the pressure-contact assist cam and back-torque limiting cam even though either one of the pressure-contact assist cam and back-torque limiting cam is molded as a reverse-draft surface. The power transmitting apparatus has a clutch housing () and a clutch member () connected to an output member (). A plurality of driven clutch plates () alternately is arranged between the driving clutch plates () of the clutch housing. The pressure plate () and the clutch member () are, respectively, formed with through windows () and () at positions corresponding to the pressure-contact assist cams () and () and the back-torque limiting cams () and () to form reverse-draft surfaces of the pressure-contact assist cams () and () and the back-torque limiting cams () and () by inserting pin-shaped cores into the windows () and ().

Method for manufacturing a power transmitting apparatus

A power transmitting apparatus can comprise a clutch housing, a plurality of driving clutch plates, a plurality of driven clutch plates movable for carrying out the pressure-contact or release relative to the driving clutch plates, a clutch member, a pressure member, pressure-contact assisting cam, back-torque limiting cam characterized in that one set of cam surfaces of the pressure-contact assisting cam or the back-torque limiting cam are arranged so that they extend along a circumferential edge of the clutch member. A crowning can be formed on one set of cam surfaces in their extending direction and/or their width direction.

A power transmitting apparatus has a clutch housing (). A clutch member (), connected to an output member (), has a plurality of driven clutch plates () alternately arranged between driving clutch plates () of the clutch housing (). A rotational force, inputted to the input member (), can be transmitted to or cut-off from the output member () via pressure-contact or release between the driving clutch plates () and driven clutch plates (). Pressure-contact assist cams and back-torque limiting cams are formed on a pressure plateand the clutch member. The gradient angle (&#x3b1;) of the back-torque limiting cams is formed larger than the gradient angle (&#x3b1;) of the pressure-contact assisting cams.

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Shizuoka, Japan

Shunichi Itou