Marine propulsion – Screw propeller – Shafting
Patent
1997-12-19
2000-06-20
Swinehart, Ed
Marine propulsion
Screw propeller
Shafting
114 555, 440 52, B63H 2300
Patent
active
060771356
ABSTRACT:
A vibrational damper reduces torsional vibration within a crankshaft of a marine engine. The vibrational damper is located on an end of the crankshaft opposite of the flywheel and includes an inertia ring that adds additional mass to this opposite end. In addition, the vibrational damper includes an elastic member that suspends the inertia ring about the crankshaft. The elastic member effectively dampens torsional vibrations. The torsional damper desirably is cooled by an air flow so as to maintain it's dampening efficiency. A ventilation duct, which is positioned directly above the vibrational damper, supplies the cooling air. Cooling is enhanced by locating a bilge system inlet below and slightly behind the vibrational damper. An air flow stream occurs between the duct and the bilge inlet and across the torsional damper to cool the torsional damper.
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Swinehart Ed
Yamaha Hatsudoki Kabushiki Kaisha
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