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:
Jul. 07, 2009
Filed:
Oct. 03, 2003
Yuji Yamanishi, Chiba, JP;
Ryoji Sato, Chiba, JP;
Kei Ishii, Chiba, JP;
Tomoaki Arakawa, Chiba, JP;
Jyun-ichi Yamada, Chiba, JP;
Tadayuki Tsutsui, Chiba, JP;
Akira Fujiwara, Saitama, JP;
Yuji Yamanishi, Chiba, JP;
Ryoji Sato, Chiba, JP;
Kei Ishii, Chiba, JP;
Tomoaki Arakawa, Chiba, JP;
Jyun-ichi Yamada, Chiba, JP;
Tadayuki Tsutsui, Chiba, JP;
Akira Fujiwara, Saitama, JP;
Abstract
Disclosed is a sintered gear composed of a sintered alloy having a metal matrix and pores. The tooth surface () of the tooth and the bottom land () have a densified layer () in which the porosity is reduced to 10% or less from the sintered alloy. The densified layer at the tooth surface is formed with a thickness of 300 to 1,000 microns, and the densified layer at the bottom land is formed with a thickness of 10 to 300 microns. The boundary surface of the densified layer is continuous from the tooth surface side to the bottom land side so as not to have a substantial level difference.