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:
Oct. 18, 2011
Filed:
Mar. 23, 2005
Kouji Kitahata, Osaka, JP;
Fumiaki Kasahara, Osaka, JP;
Yoshimasa Shirai, Osaka, JP;
Takashi Okaniwa, Tokyo, JP;
Satoshi Yamazaki, Tokyo, JP;
Kouji Kitahata, Osaka, JP;
Fumiaki Kasahara, Osaka, JP;
Yoshimasa Shirai, Osaka, JP;
Takashi Okaniwa, Tokyo, JP;
Satoshi Yamazaki, Tokyo, JP;
JTEKT Corporation, , JP;
Kyodo Yushi Co., Ltd., , JP;
Abstract
Disclosed are a lubricant composition including a lubricating base oil, fine particles and a calcium sulfonate-based thickener, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus including the speed reduction gear. The invention reduces operating noise of the speed reduction gear, regardless of the amount of backlash that occurs on combining a small gear and a large gear and without a more complicated structure for the speed reduction gear, by action of the fine particles. Further, separation of oil is prevented, by action of the calcium sulfonate-based thickener of the lubricant composition, so that electric power steering apparatus noise within the inside of a car is reduced at a low cost.