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:
Nov. 18, 2008
Filed:
Sep. 25, 2003
Kouji Kitahata, Osaka, JP;
Fumiaki Kasahara, Kashiwara, JP;
Naoki Uchida, Takaishi, JP;
Noritake Ookawa, Kurashiki, JP;
Hiroaki Murakami, Kashihara, JP;
Kouji Kitahata, Osaka, JP;
Fumiaki Kasahara, Kashiwara, JP;
Naoki Uchida, Takaishi, JP;
Noritake Ookawa, Kurashiki, JP;
Hiroaki Murakami, Kashihara, JP;
Jtekt Corporation, Osaka, JP;
Abstract
Disclosed are a lubricant composition obtained by adding a buffer particles having an average particle diameter Dof 50 μm<D≦300 μm to a lubricant, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, and noise produced in the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile caused by the electric power steering apparatus at low cost.