Valve guide for internal combustion engine made from iron...

Details Valve guide for internal combustion engine made from iron... Valve guide for internal combustion engine made from iron...

2006-05-09

2006-05-09

Yu, Justine R. (Department: 3751)

Valves and valve actuation

Valve

Materials

C123S188300

Reexamination Certificate

active

07040601

ABSTRACT:
Valve guides made of ferrous sintered alloy for internal combustion engines have improved durability of the valve stem without soft nitriding process. The valve guides include Cu: 8 to 20 mass %, C: 0.8 to 1.5 mass %, and at least one of MnS, WS2, and MoS2: 0.5 to 2 mass % and the balance of Fe, the valve guides have many pores, have a metal structure in which the copper phase dispersed in an iron pearlite matrix exists, and have a structure in which metal sulfides are dispersed between particles between the matrix and the copper phase.

REFERENCES:
patent: 5076866 (1991-12-01), Koike et al.
patent: 5326526 (1994-07-01), Ikenoue et al.
patent: 6616726 (2003-09-01), Chikahata et al.
patent: B2 55-34858 (1980-09-01), None
patent: A 5-171908 (1993-07-01), None

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