To collect sea water reserved in a first air chamber in a shaft sealing device in which three or more annular chambers are axially formed around a propeller shaft and the first and second annular chambers from the propeller shaft side are formed as air chambers.

In this shaft sealing device of the propeller shaft for a vessel, the periphery of a propelling shaft 3 for a propeller is surrounded by four or more seal rings 8 arranged in intervals in the axial direction and a seal ring is holdingly surrounded by a housing 7 from the outside to form the annular chambers between the adjacent seal rings. The first and second annular chambers from the propeller shaft side are formed in the first and second air chambers 10 and 11, lubricating oil chambers 12 are formed in the third and subsequent annular chambers, and lips are formed on the inner peripheral sides of the seal rings. The lips of the first and second seal rings from the propeller shaft side positioned on the propeller shaft end side is positioned to face the propeller shaft side. The shaft sealing device comprises a drain route 35 led to the first air chamber and a drain route 36 led to the second air chamber.

COPYRIGHT: (C)2006,JPO&NCIPI