Chain driven marine propulsion system with steerable gearcase an

Details Chain driven marine propulsion system with steerable gearcase an Chain driven marine propulsion system with steerable gearcase an

1988-10-04

1990-06-12

Basinger, Sherman D.

Marine propulsion

Screw propeller

With means effecting or facilitating movement of propulsion...

440 58, 440 75, 440 80, B63H 2542

Patent

active

049329073

ABSTRACT:
A marine propulsion system includes a steerable lower gearcase portion and a drive mechanism including a chain drive for driving dual counterrotating propellers. The dual propellers are rotatably mounted to the lower steerable gearcase portion by means of inner and outer coaxially extending propeller shafts. A sprocket is mounted to each propeller shaft, and first and second chain portions extend between the propeller shaft sprockets and a pair of upper drive sprockets, preferably disposed above the water line during boat operation. Coaxially extending inner and outer drive shafts are interconnected with the engine output shaft, and are adapted for counterrotation in response to rotation thereof. The coaxial drive shafts are interconnected with the upper drive sprockets for driving such sprockets in opposite rotational directions, thereby resulting in movement of the first and second chain portions in opposite directions. The longitudinal axis of the inner and outer drive shafts defines the steering axis about which the lower steerable gearcase portion is pivotable.

REFERENCES:
patent: 2064195 (1936-12-01), De Michelis
patent: 2196706 (1940-04-01), Naginskas
patent: 2372247 (1945-03-01), Billing
patent: 3795219 (1974-03-01), Peterson
patent: 3951096 (1976-04-01), Dunlap

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