Drivetrain and Transmission for Marine Propulsion Device for Preventing Engine Ingestion of Water

摘要

A drivetrain for a marine propulsion device includes an engine driving a crankshaft in a first direction, and a driveshaft connected in torque-transmitting relationship with the crankshaft and supported for rotation about a driveshaft axis. The drivetrain further includes a propeller shaft rotatable about a propeller shaft axis. A gearset and a selector clutch are configured to couple the propeller shaft and the driveshaft to each other in torque-transmitting relationship. A one-way clutch is disposed along the drivetrain upstream of the gearset. The one-way clutch prevents rotation of the crankshaft in a second, opposite direction so as to prevent ingestion of water by the engine via an engine exhaust system.

主权项

1. A drive train for a marine propulsion device, comprising:
an engine driving a crankshaft in a first direction; a driveshaft connected in torque-transmitting relationship with the crankshaft and supported for rotation about a driveshaft axis; a propeller shaft rotatable about a propeller shaft axis; a gear set and a selector clutch configured to couple the propeller shaft and the driveshaft to each other in torque-transmitting relationship; and a one-way clutch disposed along the drive train upstream of the gear set, the one-way clutch preventing rotation of the crankshaft in a second, opposite direction so as to prevent ingestion of water by the engine via an engine exhaust system; wherein the one-way clutch is disposed about the driveshaft in a driveshaft passageway that extends through a gearcase of the marine propulsion device; wherein the gearcase is made of one of steel and aluminum; wherein, when the gearcase is made of aluminum, the one-way clutch comprises an outer raceway that is keyed to an inner surface of the driveshaft passageway, and an inner surface of the outer raceway provides a jamming surface for a plurality of wedging elements of the one-way clutch; and wherein, when the gearcase is made of steel, the one way-clutch is seated directly in the driveshaft passageway, and the inner surface of the driveshaft passageway provides the jamming surface for the plurality of wedging elements of the one-way clutch.