Patent ID: 8424661

Claim:
A power transmitting apparatus comprising: a plurality of gear stage clutches forming at least part of a power transmitting path between an engine and wheels of a vehicle, an input from an input shaft of an engine side and an output to a wheel side of the gear stage clutches being set at predetermined gear ratios; and a gear stage selecting device being configured to select any one of the gear stage clutches in accordance with a running condition of a vehicle and to arbitrarily set the gear ratio during power transmission from the engine to the wheels; wherein each of said gear stage clutches comprises alternately arranged driving clutch discs and driven clutch discs, a hydraulic piston actuated by hydraulic oil to selectively engage or disengage the driving clutch discs and driven clutch discs, hydraulic chambers for actuating the hydraulic pistons, and supplying ports communicating with oil passages formed within the input shaft and opening on a side surface of the input shaft for supplying the hydraulic chambers with hydraulic oil from the oil passages to actuate the hydraulic pistons; wherein power can be transmitted at a predetermined gear ratio by engaging the driving clutch discs with driven clutch discs of the gear stage clutch of an arbitrary gear stage by selectively supplying hydraulic oil to the hydraulic chambers; wherein a plurality of the supplying ports are formed on a same plane of a radial cross-section of the input shaft, and wherein an annular sealing member is arranged around each of the supplying ports formed on the outer circumferential surface of the input shaft so as to enclose and seal the supplying ports, the sealing member being preformed to have a bent configuration so that it corresponds to a radius of curvature of the outer circumferential surface of the input shaft.