Marine propulsion – Screw propeller – Propeller arrangement
Patent
1997-10-02
1999-04-06
Avila, Stephen
Marine propulsion
Screw propeller
Propeller arrangement
416129, B63H 510
Patent
active
058909389
ABSTRACT:
A marine propulsion system with counter-rotating propellers is provided with the capability of causing the propellers to rotate at different speeds. A first gear is attached to an inner propeller shaft and a second gear is attached to an outer propeller shaft. The inner and outer propeller shafts are arranged in coaxial and concentric relation for rotation about an axis of rotation. A driveshaft is connected to a pinion gear which engages the teeth of the fore and aft gears at different effective diameters. The pinion gear meshes with a first plurality of gear teeth on a beveled surface of the fore gear while a second set of gear teeth of the pinion gear mesh with a second plurality of gear teeth on a beveled surface of the aft gear. Because of the different effective diameters of the first and second pluralities of gear teeth, the inner and outer shafts rotate at different speeds.
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Quicksilver Parts Catalog, "Bravo I/II/III", Revised Aug. 1996.
Eick Edward C.
Gilgenbach Hubert S.
Harry Donald F.
Smith Woody R.
Weronke Robert B.
Avila Stephen
Brunswick Corporation
Lanyi William D.
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