Method of making lip-type oil seals having improved sealing edge

Details Method of making lip-type oil seals having improved sealing edge Method of making lip-type oil seals having improved sealing edge

1996-05-16

1998-06-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

264138, 264267, 264268, 277134, 277152, 425DIG47, B29C 3702

Patent

active

057594660

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 (50) 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: 4094519 (1978-06-01), Heyn et al.
patent: 4300777 (1981-11-01), Symons

Affiliated with

Also associated with

Rating

Method of making lip-type oil seals having improved sealing edge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making lip-type oil seals having improved sealing edge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making lip-type oil seals having improved sealing edge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1456008