Oil Seal
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Sep 30, 2014
filing date -
Oct 29, 2013
priority date (Note) -
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Abstract
An oil seal includes a bidirectional thread formed by the combination of a normal thread and a reverse thread and including ship-bottom-shaped threads as the threads, in which sealing performance by the thread can be improved. A normal thread and a reverse thread that exhibit a pumping action on a sealing fluid are provided side by side on the circumference on an atmospheric-side surface of a seal lip sliding portion. The normal thread and an reverse thread are respectively threads in which a parallel thread that begins from a lip tip and a ship-bottom-shaped thread continuous with the parallel thread are integrally continuous.
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