A bearing assembly

摘要

A sealed bearing for underwater use has a grease-filled chamber 8 separated from the water in use by external seals 10. Increased water pressure tends to cause the seals to seal more tightly. Pressure compensating means e.g. piston 2 and chamber 7 are provided to counteract this tendency by supplying the external pressure to the internal chamber. A flexible diaphragm may be used instead of piston 2.