Title:
VALVE GUIDE FOR INTERNAL COMBUSTION ENGINE MADE FROM IRON BASE SINTERED ALLOY
Document Type and Number:
WIPO Patent Application WO/2003/060173
Kind Code:
A1
Abstract:
An iron base sintered alloy valve guide for an internal combustion engine, characterized in that it has a chemical composition, in mass %: Cu: 8 to 20 %, C: 0.8 to 1.5 %, at least one of MnS, WS2 and MoS2: 0.5 to 2 %, and balance: Fe, has pores, has a metal structure wherein a copper phase is dispersed in an iron pearlite base, and a metal sulfide is dispersed in the base and between particles of the copper phase. The valve guide has excellent durability also for a valve system which has not been subjected to a soft nitriding treatment.
Inventors:
CHIKAHATA KATSUNAO (JP)
HAYASHI KOICHIRO (JP)
SATO KATSUAKI (JP)
HAYASHI KOICHIRO (JP)
SATO KATSUAKI (JP)
Application Number:
PCT/JP2002/013747
Publication Date:
July 24, 2003
Filing Date:
December 27, 2002
Export Citation:
Assignee:
HITACHI POWDERED METALS (JP)
HONDA MOTOR CO LTD (JP)
CHIKAHATA KATSUNAO (JP)
HAYASHI KOICHIRO (JP)
SATO KATSUAKI (JP)
HONDA MOTOR CO LTD (JP)
CHIKAHATA KATSUNAO (JP)
HAYASHI KOICHIRO (JP)
SATO KATSUAKI (JP)
International Classes:
C22C38/00; C22C38/16; F01L3/08; (IPC1-7): C22C38/00; C22C38/16
Foreign References:
| EP0872654A2 | 1998-10-21 | |||
| JPH05171908A | 1993-07-09 | |||
| US6318327B1 | 2001-11-20 |
Attorney, Agent or Firm:
Suenari, Mikio (6-13 Kyobashi 1-chome Chuo-ku, Tokyo, JP)
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