Seal device

Details Seal device Seal device

2006-12-20

2011-11-08

Pickard, Alison (Department: 3674)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S564000, C277S560000

Reexamination Certificate

active

08052153

ABSTRACT:
[PROBLEMS] A seal device where a seal lip reliably maintains shaft sealing relative to high-pressure fluid that is to be sealed and where the equivalent Mises stress occurring in the seal lip is reduced to extend the durable term of the seal lip longer.[MEANS FOR SOLVING PROBLEMS] A backup ring (2) has a tapered section (23) continuously extending from a fixation section (21) of the backup ring (2) and also has a forward end section (24). A rounded surface (E) with a curvature radius (R-1) is formed at least at a boundary (26) where a surface (D) of the tapered section (23) changes to a surface (F) of the forward end section (24). A portion of the surface (D) of the tapered surface (23), which portion is in contact with the rounded surface (E) at the boundary (26), is a projected curvature surface having a curvature radius greater than the curvature radius (R-1) of the boundary (26).

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