Patent ID: 7900762

Claim:
A twin clutch device comprising: a first clutch of a multiple disc type includes a cylindrical portion and a first clutch outer rotated due to the power transmitted from a power source; a second clutch of a multiple disc type which includes a second clutch outer which is rotated together with the first clutch outer and is arranged coaxially with the first clutch; the first clutch outer is arranged radially outwardly with respect to the second clutch and includes an annular plate portion thereof integrally and contiguously formed with one end of the cylindrical portion, and a plurality of clutch disc engaging grooves for allowing outer peripheries of a plurality of clutch discs, provided to the first clutch to be relatively non-rotatably engaged therewith and a plurality of clutch outer engaging grooves arranged between the respective clutch disc engaging grooves wherein the plurality of clutch outer engaging grooves allows an outer periphery of the second clutch outer to be engaged therewith in a relatively non-rotatable manner, said plurality of clutch outer engaging grooves being formed in the cylindrical portion.