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:
Feb. 08, 2011
Filed:
Jun. 09, 2005
Hiromi Yokota, Aichi, JP;
Daisuke Yoshitome, Aichi, JP;
Hiroaki Hayakawa, Aichi, JP;
Naruhiko Inayoshi, Aichi, JP;
Youichi Murakami, Aichi, JP;
Masashi Suzuki, Aichi, JP;
Takahiro Nozu, Aichi, JP;
Hiromi Yokota, Aichi, JP;
Daisuke Yoshitome, Aichi, JP;
Hiroaki Hayakawa, Aichi, JP;
Naruhiko Inayoshi, Aichi, JP;
Youichi Murakami, Aichi, JP;
Masashi Suzuki, Aichi, JP;
Takahiro Nozu, Aichi, JP;
Taiho Kogyo Co., Ltd., Toyota-shi, JP;
Denso Corporation, Kariya-shi, JP;
Abstract
In a Cu—Bi based sintered alloy, to which hard particles, such as FeP, are added, the main constituent components of the microstructure are a Cu matrix, Bi phase and the hard particles. In the sintering method of the present invention, the flow of the Bi phase is suppressed to as low level as possible. The novel structure is that the contact between the Bi phase and hard particles is kept to a low ratio. A lead-free bearing used for a fuel injection pump according to the present invention contains from 1 to 30 mass % of Bi and from 0.1 to 10 mass % of hard particles having from 10 to 50 μm of the average particle diameter, the balance being Cu and unavoidable impurities. The properties of the main component phases are utilized at a high level such that the sliding properties are equivalent to those of a Pb containing Cu-based sintered alloy.