Marine propulsion – Screw propeller – Having transmission
Patent
1988-09-15
1989-09-26
Peters, Jr., Joseph F.
Marine propulsion
Screw propeller
Having transmission
B63H 2124
Patent
active
048696927
ABSTRACT:
An outboard marine propulsion system incorporates a chain or belt drive for driving the propeller shaft to which the propeller is mounted. The chain extends between the propeller shaft and an intermediate shaft disposed in the upper portion of the depending gearcase of the outboard marine drive. The intermediate shaft is located above the water line during boat operation. A drive mechanism is disposed between the intermediate shaft and a depending drive shaft associated with the engine mounted in the power head of the outboard system. The drive mechanism is preferably located above the water line during boat operation and incorporates a bevel gearing system and a selectively actuable clutch mechanism for providing forward and reverse operation. With the provision of the drive mechanism above the water line during boat operation, the bevel gears associated with the drive mechanism can be sized so as to achieve the large reduction ratio necessary to transfer high power from the power head to the propeller. The increased sizing of the gears has no effect on the frontal area of the submerged portions of the lower unit, thereby having no effect on drag provided by such components during operation.
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Brunswick Corporation
Peters Jr. Joseph F.
Sotelo Jesus D.
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