Marine propulsion – Screw propeller – Shafting
Patent
1997-08-14
1999-05-25
Basinger, Sherman
Marine propulsion
Screw propeller
Shafting
2989809, 254 93R, 384428, B63H 2334
Patent
active
059065230
ABSTRACT:
An intermediate bearing assembly that is mountable on a pedestal of a marine vessel that incorporates an integrated alignment system. In particular, the bearing assembly includes a housing for receiving a portion of a shaft; and a lifting and lowering system attached between the housing and the pedestal for providing a concentrated applied force at approximately the center vertical axis of the housing. The lifting and lowering system includes four hydraulic jacks located equidistant from the center vertical axis of the housing. Hydraulic pressure is related through the area of the jack cylinders to radial force. As a result, when a predetermined jacking force is achieved, the correct radial force loading on the bearing is attained. Each of the jacks is free to seek a position of extension independent of the others. The jacks are then locked into a secure hold position to maintain the shaft in alignment. If at any time during the vessels duty the shaft becomes misaligned the jacks are unlocked and hydraulic pressure is either reduced or increased to level the shaft and the jacks are then locked into the new holding position. This operation can be repeated as many times as required during the vessel's life without the cost of expensive traditional chocking procedures.
REFERENCES:
patent: 3718378 (1973-02-01), Clay
patent: 4014515 (1977-03-01), Graafsma
patent: 4173329 (1979-11-01), Stith, Jr.
patent: 4571096 (1986-02-01), Swasey et al.
patent: 4749282 (1988-06-01), Spargo et al.
patent: 4867889 (1989-09-01), Jacobson
patent: 5641824 (1997-06-01), Forschirm
"Support for life", Marine Engineers Review, Feb. 1997, p. 32/33, XP000680895, see the whole document.
Basinger Sherman
Thordon Bearings Inc.
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