An improved expanding friction disk for use in a clutch of a power transmission system. The improved expanding friction disk accommodates multiple clutch pack configurations including clutch packs utilizing novel improved friction disks, is compatible with wear liners and operates with reduced friction including a reduced difference between the static and dynamic coefficients of friction in the ramp mechanism.

An improved expanding friction disk for use in a clutch of a power transmission system. The improved expanding friction disk accommodates multiple clutch pack configurations including clutch packs utilizing novel improved friction disks, is compatible with wear liners and operates with reduced friction including a reduced difference between the static and dynamic coefficients of friction in the ramp mechanism.

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 transmission housing (2) of the type including two housing elements (9) that can be positioned to press against each other and that in the assembled-together state define: a cavity (13); a shaft (6) projecting at least in part from the housing (2); a motion transmission mechanism (30) for transmitting motion to said shaft (6), the motion transmission mechanism (30) being housed at least in part inside the cavity (13) of the housing (2); and sealing means (15) arranged in the zone where the housing elements (9) are pressed together and referred to as a join plane (10), the sealing means (15) surrounding said cavity (13). The housing (2) comprises means (17) for connecting the housing elements (9) together by snap-fastening in order to hold the housing elements (9) pressed against each other and the sealing means (15) comprise adhesive connection means (16) for connecting said housing elements (9) together.

A transmission housing (2) of the type including two housing elements (9) that can be positioned to press against each other and that in the assembled-together state define: a cavity (13); a shaft (6) projecting at least in part from the housing (2); a motion transmission mechanism (30) for transmitting motion to said shaft (6), the motion transmission mechanism (30) being housed at least in part inside the cavity (13) of the housing (2); and sealing means (15) arranged in the zone where the housing elements (9) are pressed together and referred to as a join plane (10), the sealing means (15) surrounding said cavity (13). The housing (2) comprises means (17) for connecting the housing elements (9) together by snap-fastening in order to hold the housing elements (9) pressed against each other and the sealing means (15) comprise adhesive connection means (16) for connecting said housing elements (9) together.

A multiple disc clutch device has a piston in which the surrounding structure and operation control are simplified. The multiple disc clutch device includes a cam mechanism part that axially moves the piston. The cam mechanism part includes an annular cam member B and an annular cam member A. The cam member B is disposed coaxially with the piston and is axially movable. The cam member A axially faces the cam member B and is rotatable relative to the cam member B. The cam mechanism part converts rotation of the cam member A into axial movement of the cam member B to axially move the piston by the axial movement of the cam member B.

A retainer of a clutch device holds a weight held so as to be slidable in a substantially radial direction around a rotation axis. A push lever swings in response to a sliding movement of the weight, and, upon rotation, applies a centrifugal force to the weight to cause the weight to slide in an outer circumferential direction and brings an abutting end of the push lever into abutment with a pressure plate of the clutch device to apply a predetermined load to the pressure plate. The retainer includes a stopper to limit a movable range of the weight. At least the abutting end of the push lever is formed of an elastically deformable member.

A clutch device and a retainer thereof that are capable of allowing a large number of riders to enjoy riding motorcycles regardless of their physical strengths or driving skills, while ensuring the clamped state between a friction plate and a clutch plate in all engine speed ranges. A retainer of a clutch device holds a weight held so as to be slidable in a substantially radial direction around a rotation axis. A push lever swings in response to a sliding movement of the weight, and, upon rotation, applies a centrifugal force to the weight to cause the weight to slide in an outer circumferential direction and brings an abutting end of the push lever into abutment with a pressure plate of the clutch device to apply a predetermined load to the pressure plate. The retainer includes a stopper to limit a movable range of the weight. At least the abutting end of the push lever is formed of an elastically deformable member.

A transmission housing (2) including two housing elements (9) that can be positioned to press against each other and that in the assembled state define: a cavity (13); a shaft (6) projecting at least in part from the housing; a motion transmission mechanism (30) for transmitting motion to said shaft (6), the motion transmission mechanism (30) being housed at least in part inside the cavity (13) of the housing (2); and adhesive connection means (16) for connecting together housing elements (9) that are arranged in the zone where said housing elements (9) are pressed together and referred to as a join plane (10). The adhesive connection means (16) include a main channel (163) for receiving adhesive surrounding said cavity (13), said main channel (163) comprising a female element (1631) carried by a housing element (9) and a male element (1632) carried by the other housing element (9) with the male element (1632) being engaged at least in part in the female element (1631) in the assembled-together state of said housing elements (9).

A transmission housing (2) including two housing elements (9) that can be positioned to press against each other and that in the assembled state define: a cavity (13); a shaft (6) projecting at least in part from the housing; a motion transmission mechanism (30) for transmitting motion to said shaft (6), the motion transmission mechanism (30) being housed at least in part inside the cavity (13) of the housing (2); and adhesive connection means (16) for connecting together housing elements (9) that are arranged in the zone where said housing elements (9) are pressed together and referred to as a join plane (10). The adhesive connection means (16) include a main channel (163) for receiving adhesive surrounding said cavity (13), said main channel (163) comprising a female element (1631) carried by a housing element (9) and a male element (1632) carried by the other housing element (9) with the male element (1632) being engaged at least in part in the female element (1631) in the assembled-together state of said housing elements (9).