During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

In a power transmission apparatus, a centrifugal clutch includes a holder, a press, and springs to urge masses from a radially outer position to a radially inner position. The masses are each housed in an associated one of housing portions arranged in a circumferential direction of the holder such that the masses are radially movable. More than one spring is provided in the circumferential direction between an inner peripheral wall surface of each of the housing portions and an associated one of the masses to urge the associated mass from the radially outer position to the radially inner position.

A power transmission apparatus a centrifugal clutch including a holder and a press. The holder and the press are each circumferentially provided with protrusions fitted and attached to cut-outs of a clutch housing. The holder is an integrated assembly into which a mass that is being held is integrated. The integrated assembly and the press are non-connected separate components and are independently movable toward or away from each other.

During movement of a mass of a centrifugal clutch a radially inner position to a radially outer position and a resulting increase in torque transmitted from an input gear to an output shaft, a power transmission apparatus includes a first torque region where the apparatus restricts operation of a pressing assist cam and a second torque region where the apparatus allows operation of the pressing assist cam.

A saddle ride type vehicular dry clutch having passive clutch disc of co-axial fixed plane contact, used for seamlessly undertaking the drives from the drive bearing assembly, in which the drive bearing assembly includes a bearing body and an active disc, and the saddle ride type vehicular dry clutch comprises: a clutch device, including a drive axle body formed with a central through-hole, having non-planar guiding slide grooves and an axle body perimeter edge remote from the central through-hole; a passive clutch disc, having a contact surface and a friction drive surface, and assembly ports for assembling elastic components outside of the engage drive area; centrifugal rollers, accommodated within the non-planar guiding slide grooves; and the driven devices includes a drive disc, formed with radially symmetric drive snap ports; a clutch shell, having a tubular inner wall, a surrounding outer wall and a connection wall.

A saddle ride type vehicular dry clutch having passive clutch disc of co-axial fixed plane contact, used for seamlessly undertaking the drives from the drive bearing assembly, in which the drive bearing assembly includes a bearing body and an active disc, and the saddle ride type vehicular dry clutch comprises: a clutch device, including a drive axle body formed with a central through-hole, having non-planar guiding slide grooves and an axle body perimeter edge remote from the central through-hole; a passive clutch disc, having a contact surface and a friction drive surface, and assembly ports for assembling elastic components outside of the engage drive area; centrifugal rollers, accommodated within the non-planar guiding slide grooves; and the driven devices includes a drive disc, formed with radially symmetric drive snap ports; a clutch shell, having a tubular inner wall, a surrounding outer wall and a connection wall.

A centrifugal clutch (1) for a drive train of a motor vehicle, has an input component (2) which serves for the introduction of torque, an output component (3) which serves for the discharge of torque. The clutch includes an engine-side centrifugal mass (5) and a transmission-side centrifugal mass (6) for actuating the friction unit (4), which centrifugal masses (5; 6) are operatively connected to an engine-side and transmission-side bent sheet metal piece (7, 8). At least one of the centrifugal masses (5; 6) has a cut-out (9) which is such that at least one device (10) which is fixed to the input component has an arm (11) which engages into the cut-out (9) in such a way that guidance of the radial displacement of at least one of the centrifugal masses (5; 6) is ensured.

A centrifugal clutch (1) for a drive train of a motor vehicle, has an input component (2) which serves for the introduction of torque, an output component (3) which serves for the discharge of torque. The clutch includes an engine-side centrifugal mass (5) and a transmission-side centrifugal mass (6) for actuating the friction unit (4), which centrifugal masses (5; 6) are operatively connected to an engine-side and transmission-side bent sheet metal piece (7, 8). At least one of the centrifugal masses (5; 6) has a cut-out (9) which is such that at least one device (10) which is fixed to the input component has an arm (11) which engages into the cut-out (9) in such a way that guidance of the radial displacement of at least one of the centrifugal masses (5; 6) is ensured.