Marine propulsion – Screw propeller – Shafting
Patent
1996-10-22
1998-02-24
Swinehart, Ed L.
Marine propulsion
Screw propeller
Shafting
440111, 464 73, B63H 2324
Patent
active
057206384
ABSTRACT:
A jet propelled watercraft has a coupling assembly to couple an engine crankshaft to a jet pump impeller shaft. The coupling assembly can accommodate substantial engine crankshaft vibrations, yet effectively isolates the jet pump impeller shaft from transverse movement. The coupling assembly includes an engine crankshaft coupling head, an intermediate coupler, an impeller shaft coupling head, and two elastomeric isolators positioned between each of the coupling heads and the intermediate coupler. The intermediate coupler is supported exclusively by the elastomeric isolators, and is allowed to tilt transverse to the rotational axis of the intermediate coupler to accommodate engine crankshaft displacement. The coupling assembly is practical for personal watercraft because, although elastomeric isolators wear or shred quickly in the presence of transverse misalignment, elastomeric isolators provide significant durability in the presence of a reasonable amount of angular displacement. The coupling assembly allows the engine to be soft mounted to the hull of the watercraft, and therefore significantly reduces engine noises resonating from the watercraft hull.
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Rotex Torsionally flexible shaft couplings, KTR Corporation.
Brunswick Corp.
Swinehart Ed L.
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