US 12,410,864 B2
Shaft sealing structure
Takayuki Murai, Moriya (JP); and Takashi Arakawa, Nagareyama (JP)
Assigned to SMC CORPORATION, Tokyo (JP)
Filed by SMC CORPORATION, Tokyo (JP)
Filed on Dec. 22, 2023, as Appl. No. 18/394,318.
Application 18/394,318 is a continuation of application No. 17/655,592, filed on Mar. 21, 2022, granted, now 11,976,729.
Claims priority of application No. 2021-048030 (JP), filed on Mar. 23, 2021; and application No. 2022-002691 (JP), filed on Jan. 12, 2022.
Prior Publication US 2024/0125389 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F16J 15/20 (2006.01); F16J 15/18 (2006.01); F16J 15/3236 (2016.01); F16J 15/3272 (2016.01)
CPC F16J 15/20 (2013.01) [F16J 15/188 (2013.01); F16J 15/3236 (2013.01); F16J 15/3272 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A shaft sealing structure arranged between a rod configured to be driven within a predetermined fluid and move in an axial direction, and a holder in which the rod is accommodated, the shaft sealing structure comprising:
a V-packing;
a first guide bush attached to an inner circumference of the holder; and
a scraper arranged at an end of the holder, wherein the V-packing is formed of a top portion formed to be thick-walled, an inner side skirt portion formed to be thin-walled and extending diagonally inward from the top portion, and an outer side skirt portion formed to be thin-walled and extending diagonally outward from the top portion,
the inner side skirt portion slidably contacts an outer surface of the rod at a distal end of the inner side skirt portion, and the outer side skirt portion abuts against an inner surface of the holder at a distal end of the outer side skirt portion, and
the top portion is sandwiched between the scraper and the first guide bush, and the inner side skirt portion and the outer side skirt portion are freely deformable inside a space formed between the first guide bush and the scraper.