Leakproof seal for bearings

Details Leakproof seal for bearings Leakproof seal for bearings

1975-01-24

1976-01-27

Wood, Jr., M. H.

Cutlery

115 34R, 308122, 308DIG12, F16C 124

Patent

active

039349527

ABSTRACT:
An annular liquid collecting chamber is provided between the aft end of a stern tube bearing for a ship's propeller shaft and the forward end of the aft stern tube seal. A floating seal ring at the aft end of the stern tube bearing retains oil in the bearing but there is leakage of a small percentage of oil into the collecting chamber. A scavenge pump is coupled to the bottom of the collecting chamber to remove any fluids that collect therein. The oil in the output of the scavenge pump is coalesced and pumped to the stern tube oil sump tank to be recycled. The aft stern tube seal includes at least three seal rings whose lips are all directed outboard. Filtered sea water is pumped into a first annular space between two of the seal rings and circulates in an outboard direction to cool and lubricate the rings and wash away any dirt. Filtered sea water at a lower pressure is applied to an annular space which is forward of the first space to lubricate the rings and to lower the pressure drop across an intermediate ring. In certain installations where there is a projecting strut, there may be collecting from both ends of the bearing.

REFERENCES:
patent: 3565447 (1971-02-01), Joachim et al.
patent: 3787105 (1974-01-01), Gardner
patent: 3863737 (1975-02-01), Kakihara
patent: 3889626 (1975-06-01), Kakihara

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