Seal ring and stern tube sealing device

Abstract

Provided is a seal ring such that the contact stress of a seal lip section is set so as to be maintained in an appropriate state where trouble such as leakage or early abnormal wear does not occur, that durability is improved while maintaining sealability, that furthermore, the installability of a seal outer peripheral section which fits into an annular groove of a casing is improved, and that the contact surface of the seal lip section is stabilized. The seal ring is characterized in that the top of a key section (29) is formed into a chevron shape on the radial outside of the key section (29), with the center (T) as the vertex; that furthermore, the portion between the key section (29) and a heel section (31) comprises step sections (37a, 37b) in order for the axial thickness to be smaller; that the inside diameter of the step section (37b), which is on the back side, is formed to be larger than the inside diameter of the step section (37a), which is on the front side; that moreover, a tip (39) of a lip section (35) protrudes into a chevron shape; and that the center (P) of a spring groove (43) whereinto is fitted an annular spring (41) that presses the lip tip (39) against a liner (15), is provided in such a way as to be offset from the lip tip (39) toward the lip backside within a range equal to 10% of the propeller-shaft-wise length of the lip back surface width.

Description

technical field [0001] The invention relates to a sealing ring and a stern tube sealing device using the same. The sealing ring is arranged between a propulsion shaft and a shell part of a ship to prevent seawater from entering the inner side of the ship. The propulsion shaft passes through the ship of the stern tube. inside the housing components located outside. Background technique [0002] Conventionally, sealing rings made of rubber or elastomers have been used in stern tube sealing devices. [0003] For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2000-238694), as Figure 7 As shown, a stern tube sealing device 010 is disclosed, wherein a lip-shaped sealing ring 04 made of elastic components is slipped with a bush 03 installed on the propulsion shaft (propeller shaft) 02 passing through the stern tube 01, 05 and 06 are arranged between a plurality of shell parts 07, and the first stern annular space 08 is formed by the first seal ring 04 a...

AI Technical Summary

Problems solved by technology

[0012] Therefore, in this patent document 1, there is no disclosure of the sectional shape of the seal ring such that the outer peripheral portion of the seal ring is stably fitted into the groove formed on the inner periphery of the housing; Adapt to the cross-sectional shape of the housing; and maintain the contact stress of the sealing lip in an appropriate state to prevent leakage through the sliding surface of the sealing lip and the propeller shaft or early abnormal wear of the sealing lip, etc., thereby improving sealing performance

Images