Masakazu Wada

US Patent:

6488736, Dec 3, 2002

Filed:

Mar 19, 2001

Appl. No.:

09/810563

Inventors:

Katsuhiko Ueda - Chiba, JP
Makoto Iwakiri - Chiba, JP
Yoshimi Sugaya - Chiba, JP
Yutaka Mabuchi - Kanagawa, JP
Masato Yamaguchi - Kanagawa, JP
Akira Fujiki - Yokohama, JP
Yukihiro Maekawa - Yokohama, JP
Masakazu Wada - Farmington Hills MI

Assignee:

Nissan Motor Co., Ltd. - Yokohama
Hitachi Powdered Metals Co., Ltd. - Matsudo

International Classification:

B22F 300

US Classification:

75246, 75243, 419 11, 419 29, 419 38

Abstract:

A sintered metal sprocket for a silent chain is produced by the following steps. A base mixture is prepared, which contains a powder metallurgical iron powder, a lubricant and a graphite powder. Then, the base mixture is subjected to a compression molding while being heated at above approximately 100Â C. thereby to produce a green compact. Then, the green compact is subjected to a sintering at a temperature above approximately 1180Â C. For much improving the mechanical performance of the sprocket thus sintered, the same may be subjected to a carbonizing hardening or an induction hardening.