The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 2004
Filed:
May. 23, 2001
Hiroaki Takebayashi, Osaka, JP;
Kazunori Hayashida, Osaka, JP;
Kazutoshi Yamamoto, Osaka, JP;
Yoshiki Fujii, Osaka, JP;
Shinichi Ohbayashi, Tokushima, JP;
Yishihiro Yano, Tokushima, JP;
Other;
Abstract
The object of the present invention is to improve sealing performance of a seal under a specific environment. The seal is arranged in an annular space A in which a rotary shaft and a housing face each other, and partitions the annular space in axial direction into a vacuum space B and an atmospheric pressure space C. The seal is constituted such that a main lip of the seal has an axial contact width W with which the main lip slides on and contacts with the rotary shaft and which is set to be equal to or larger than an axial contact width W necessary to secure minimum sealing performance with respect to a sealed portion and equal to or smaller than an axial contact width W with which sliding resistance against the rotary shaft becomes a permissible upper limit, to thereby prevent the axial contact width W from influencing rotation characteristics with respect to the rotary member and to allow securing required sealing performance.