Oil seals and method of making thereof

Details Oil seals and method of making thereof Oil seals and method of making thereof

1997-06-10

1999-06-29

Reichard, Lynne A.

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

277560, B29C 3702

Patent

active

059156961

ABSTRACT:
Lip-type oil seals (10) having helical pumping ribs (40) are manufactured by preparing a molded foreproduct of the seal and by trimming a hat portion (62) to form a sharp sealing edge (32). Each of the pumping ribs (40) is configured to include a first section (50) of a uniform cross-section and a bilge-shaped second section (52). Trimming is made along a trim line (68) that intersects in between the length of the first sections (50) to ensure that a length of the first sections (52) is preserved between the sealing edge (32) and the second sections (52) regardless of the tolerance of positioning of a trimming knife. Oil seals having an improved initial static and dynamic sealing performance is obtained. The second sections (52) achieves a satisfactory pumping action even after a substantial wear has taken place.

REFERENCES:
patent: 3347554 (1967-10-01), Jagger et al.
patent: 3534969 (1970-10-01), Weinand
patent: 3633927 (1972-01-01), Van Deven
patent: 3767739 (1973-10-01), Smith
patent: 3807743 (1974-04-01), Burke
patent: 4094519 (1978-06-01), Heyn et al.
patent: 4300777 (1981-11-01), Symons

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