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:
Apr. 09, 2013
Filed:
Feb. 22, 2008
Hiroki Matsui, Fukushima, JP;
Masayuki Tanida, Fukushima, JP;
Hirotaka Mizuta, Fujisawa, JP;
Hideyuki Furuyama, Fukushima, JP;
Ken Yoshikawa, Fukushima, JP;
Yuki Sato, Fujisawa, JP;
Hiroki Matsui, Fukushima, JP;
Masayuki Tanida, Fukushima, JP;
Hirotaka Mizuta, Fujisawa, JP;
Hideyuki Furuyama, Fukushima, JP;
Ken Yoshikawa, Fukushima, JP;
Yuki Sato, Fujisawa, JP;
NOK Corporation, , JP;
Abstract
For an oil seal () having a seal lip () with a slope () at the side of sealed fluid and a slope () at the side opposite to the sealed fluid, and a screw section () provided on the slope () for pushing back sealed fluid by a pumping effect at a time of rotation, in order to achieve low torque characteristics based on fluid lubrication by increasing the thickness of an oil film on sliding surfaces, an intermediate surface () is provided between the slopes (), and an oppositely threaded screw section () for sucking the sealed fluid by a pumping effect is provided on the intermediate surface () without reaching the boundary () between the intermediate surface () and the slope (), so that a threadless region is provided in the entire circumference between the screw section () and the boundary ().