Gear driven marine propulsion system with steerable gearcase and

Details Gear driven marine propulsion system with steerable gearcase and Gear driven marine propulsion system with steerable gearcase and

1988-10-04

1989-12-19

Peters, Jr., Joseph F.

Marine propulsion

Screw propeller

Propeller arrangement

440 53, 416128, B63H 510

Patent

active

048879827

ABSTRACT:
A marine propulsion system is provided with dual counterrotating propellers, and a shaft and gear arrangement for driving the propellers. In a preferred embodiment, the marine propulsion system includes a depending gearcase having a steerable lower portion which is pivotable about a steering axis relative to an upper gearcase portion. A pair of coaxial drive shafts extend longitudinally through the gearcase, and are interconnected with the engine output shaft so as to rotate in opposite directions in response to rotation of the output shaft. The counterrotating propellers are preferably mounted to a pair of coaxial propeller shafts, and appropriate gearing is disposed between the coaxial propeller shafts and the coaxial drive shafts to drive the propeller shafts, and thereby the propellers, in opposite rotational directions. In a preferred embodiment, the gearing includes counterrotating gears fixed to the counterrotating drive shaft so as to provide cancelling gear torque loads about the steering axis. The counterrotating propellers likewise provide cancelling propeller torque loads to further accommodate steering of the steerable gearcase portion.

REFERENCES:
patent: 2372247 (1945-03-01), Billing
patent: 3084657 (1963-04-01), Kiekhaefer
patent: 3946698 (1976-03-01), LaFollette et al.
patent: 4529387 (1985-07-01), Brandt
patent: 4642059 (1987-02-01), Nohara

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