CLUTCH MECHANISM OF POWER TRANSMISSION DEVICE

PURPOSE:To reduce the axial dimensions and to simplify a working liquid supply path to the interior of a hydraulic cylinder by fitting a piston of a fluid actuator and the inner cylinder of an annular clutch cylinder to a spline formed on the outer periphery of the central axis. CONSTITUTION:A spline 901 is disposed on the outer periphery of the first output shaft 3, which is the central shaft for driving one side wheel and disposed in series to an input shaft 2. An inner peripheral cylindrical portion 902, a disc- like portion 903 and an outer peripheral cylindrical portion 904 fitted to the spline 901 are joined to one another, and an annular clutch drum 905 is disposed. Inner and outer peripheral multiple discs 908, 906 respectively spline-fitted to the inside and outside of the outer peripheral cylindrical portion 904 are alternately combined, and a multiple disc clutch is disposed. Further, there are provided a clutch piston 912 internally fitted through O-rings 910, 911 in the clutch drum 905, and a hydraulic servo C-2 for driving the clutch piston. Working fluid is supplied through oil paths 916-919 to the hydraulic servo C-2.