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:
Feb. 11, 2003
Filed:
May. 01, 2001
Other;
Abstract
An elastomer lip member with its rear supported by a pressure resisting back-up ring, and a synthetic resin lip member arranged on a rear side of the elastomer lip are comprised, and on the inner circumferential surface of the seal lip portion of the elastomer lip member, helical grooves generating a pumping action of a fluid introducing direction from an inner space of machine side when a shaft rotates are formed. When a pressure in the inner space of machine is MPa (gage), by making a contact width between the seal lip portion of the elastomer lip member and a shaft at least 0.6 mm, so that a surface pressure maximum portion of the seal lip portion of the elastomer lip member to the shaft is biased or maldistributed toward its rear side whereby a fluid introduction by said helical grooves is performed satisfactorily.