发明名称 Method of making lip-type oil seals having improved sealing edge
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 (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.
申请公布号 US5759466(A) 申请公布日期 1998.06.02
申请号 US19960648574 申请日期 1996.05.16
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
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