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:
May. 04, 2010
Filed:
Mar. 17, 2005
Kouji Kitahata, Osaka, JP;
Naoki Uchida, Osaka, JP;
Mitsuo Yoneda, Osaka, JP;
Masahiro Hayashi, Yokohama, JP;
Kouji Kitahata, Osaka, JP;
Naoki Uchida, Osaka, JP;
Mitsuo Yoneda, Osaka, JP;
Masahiro Hayashi, Yokohama, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Nippon Polyurethane Industry Co., Ltd., Tokyo, JP;
Abstract
Disclosed are a lubricant composition to which is added as buffer particles to a lubricant polyurethane resin particles obtained by reacting and synthesizing long-chain polyol having a number-average molecular weight of not less than 500, a crosslinking agent having three or more active hydrogen groups in one molecule, and polyisocyanate as buffer particles, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, wherein noise produced by 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 due to the electric power steering apparatus at low cost.