Engine drive shaft coupler for personal watercraft

Details Engine drive shaft coupler for personal watercraft Engine drive shaft coupler for personal watercraft

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.

REFERENCES:
patent: 3837179 (1974-09-01), Barth
patent: 4037431 (1977-07-01), Sugimoto
patent: 4631032 (1986-12-01), Nishida
patent: 4689028 (1987-08-01), Murase
patent: 4722707 (1988-02-01), Murase
patent: 4743213 (1988-05-01), Nishida
patent: 4813898 (1989-03-01), Nakase et al.
patent: 4925408 (1990-05-01), Webb et al.
patent: 4984528 (1991-01-01), Kobayashi
patent: 5282444 (1994-02-01), Ito et al.
Rotex Torsionally flexible shaft couplings, KTR Corporation.

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