Marine propulsion – Screw propeller – Shafting
Patent
1990-05-21
1991-10-01
Swinehart, Ed
Marine propulsion
Screw propeller
Shafting
440113, 204147, B63H 2334
Patent
active
050529625
ABSTRACT:
A corrosion reducer for use with ships having a hull, a propeller mounted a propeller shaft and extending through the hull, bearings supporting the shaft, at least one thrust bearing and one seal. The improvement includes a current collector and a current reduction assembly for reducing the voltage between the hull and shaft in order to reduce corrosion due to electrolytic action. The current reduction assembly includes an electrical contact, the current collector, and the hull. The current reduction assembly further includes a device for sensing and measuring the voltage between the hull and the shaft and a device for applying a reverse voltage between the hull and the shaft so that the resulting voltage differential is from 0 to 0.05 volts. The current reduction assembly further includes a differential amplifier having a voltage differential between the hull and the shaft. The current reduction assembly further includes an amplifier and a power output circuit receiving signals from the differential amplifier and being supplied by at least one current supply. The current selector includes a brush assembly in contact with a slip ring over the shaft so that its potential may be applied to the differential amplifier.
REFERENCES:
patent: 3033775 (1962-05-01), Chevigny et al.
patent: 3108940 (1963-10-01), Holdsworth
patent: 4322633 (1982-03-01), Staerzl
patent: 4492877 (1985-01-01), Staerzl
patent: 4528460 (1985-07-01), Staerzl
patent: 4592818 (1986-06-01), Cavil et al.
Bechtel James B.
Swinehart Ed
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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