Patent ID: 8327988

Claim:
A twin clutch device used in an engine transmission, comprising: a first disk clutch; a second disk clutch coaxially and adjacently arranged next to said first disk clutch, said first disk clutch and said second disk clutch being displaced in an axial direction by a pressing member via externally supplied hydraulic pressure to exert a predetermined engagement force; wherein said first disk clutch and said second disk clutch respectively have: an engagement side hydraulic chamber that gives said pressing member a pressing force towards a clutch engagement side; and a pressure compensation hydraulic chamber that gives said pressing member a pressing force towards a clutch disengagement side to compensate a pressure of a returning action thereof, wherein said pressing member is disposed intermediate said engagement side hydraulic chamber and said pressure compensation hydraulic chamber and at least a portion of said pressing member is disposed intermediate at least one of said first and second disk clutches and said pressure compensation hydraulic chamber; and a plurality of pipes are internally and externally superposed and inserted into a main shaft connected to said first disk clutch and said second disk clutch, and each of a plurality of spaces within said main shaft divided by these pipes serves as an in-shaft oil passage that communicates with any one of said engagement side hydraulic chamber or said pressure compensation hydraulic chamber.