Patent ID: 8747279
Filing Date: 2014-06-10
Classification: F16D,Y10T

Abstract:
1. A driving force transmission device, comprising: a dry clutch interposed between a clutch hub and a clutch drum in a driving force transmission system for selectively disconnecting and connecting a driving force by clutch release and engagement operations; a piston disposed slidably in a housing member to make a stroke movement in a clutch engagement direction by oil pressure at engagement of the dry clutch; a piston arm disposed slidably in a through hole formed in the clutch drum to allow an arm distal end projecting into a clutch chamber accommodating the dry clutch to stroke following the stroke movement of the piston; a return spring interposed between a side wall of the clutch drum and the piston arm for imparting a biasing force to the piston arm in a clutch releasing direction during a release period of the dry clutch; an elastic seal member fixed to the side wall of the clutch drum sealing the through hole and the arm distal end from the clutch chamber to undergo elastic deformation to follow the stroke of the arm distal end; and an arm fixing plate integrally provided with the elastic seal member and fixed to the arm distal end to transfer clutch engagement force by contacting the clutch plate during engagement of the dry clutch.