发明名称 |
Oil seals and method of making thereof |
摘要 |
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.
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申请公布号 |
US6036193(A) |
申请公布日期 |
2000.03.14 |
申请号 |
US19990294343 |
申请日期 |
1999.04.20 |
申请人 |
NOK CORPORATION |
发明人 |
ONUMA, TSUNEHISA;FURUYAMA, HIDEYUKI |
分类号 |
F16J15/32;(IPC1-7):B29C37/02 |
主分类号 |
F16J15/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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