POWER TRANSMISSION DEVICE

摘要

One object of the present invention is to provide a power transmitting apparatus which can improve its power transmitting efficiency with reducing the speed shift time lag as well as reducing the longitudinal dimension of the input shaft and thus a whole longitudinal dimension of the power transmitting apparatus. According to the present invention there is provided a power transmitting apparatus comprising a plurality of gear stage clutch means arranged on the way of a power transmitting path between an engine and the wheels, the input from a input shaft of the engine side and the output to the wheel side of the gear stage clutch means being set at predetermined gear ratios; and a gear stage selecting means being able to select any one of the gear stage clutch means in accordance with the running condition of a vehicle and to arbitrarily set the gear ratio during power transmission from the engine to the wheels characterized in that each of said gear stage clutch means comprises alternately arranged driving clutch discs and driven clutch discs; hydraulic pistons 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 the side surface of the input shaft for supplying the hydraulic chambers with hydraulic oil from the oil passages to actuate the hydraulic pistons; that the power can be transmitted at a predetermined gear ratio with engaging the driving clutch discs with driven clutch discs of the gear stage clutch means of an arbitrary gear stage by selectively supplying hydraulic oil to the hydraulic chambers ; and that a plurality of the supplying ports are formed on a same plane of a radial cross-section of the input shaft.