Patent ID: 7506737

Claim:
A marine reversing gear assembly provided with a locking device comprising: an input shaft driven by an internal combustion engine; an output shaft connected to a propeller shaft; a hydraulic pump driven by the input shaft; a hydraulic forward and reverse clutch; a directional control valve for switching the forward or reverse clutch by the supply of working oil from the hydraulic pump; and a locking device provided with a locking mechanism for locking the output shaft, and a hydraulic actuator for unlocking the output shaft by operating on the locking mechanism due to the supply of working oil from the hydraulic pump, wherein the locking mechanism includes a locking part and a locked part, which are constructed to enter into an engaged locking position when pressure of the working oil falls to a relatively low pressure, so that rotation of the output shaft is blocked immediately when the locking part and the locked part enter into the engaged locking position.