Ship drive with variable-pitch propeller

Details Ship drive with variable-pitch propeller Ship drive with variable-pitch propeller

1990-11-16

1991-10-29

Basinger, Sherman

Marine propulsion

Screw propeller

Variable pitch

416 25, 416 30, 416157R, B63H 308, B63H 310

Patent

active

050612123

ABSTRACT:
A variable-speed propeller in a ship drive has the hydraulic valves feeding the working chambers of the hydraulic drive for the variable-speed propeller formed as electromagnetic valves controlled by timing relays which can be switched by a rocker switch or push-button switches to adjust the propeller pitch by an angular increment controlled by the "on" time of the relays. The engine speed is detected and, when the engine speed exceeds the maximum speed of the engine, the relay associated with increased pitch is triggered to obtain an increment of engine-speed reduction, thereby preventing the system from inadvertently having the blade pitch reduced when the engine is at maximum speed.

REFERENCES:
patent: 2986221 (1961-05-01), Liaaen
patent: 3088523 (1963-05-01), Smalley et al.
patent: 3110348 (1963-11-01), Greiner
patent: 3802800 (1974-04-01), Merkx et al.
patent: 4588354 (1986-05-01), Duchesneau et al.

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