Valve-seat insert for internal combustion engines

Details Valve-seat insert for internal combustion engines Valve-seat insert for internal combustion engines

1984-06-29

1985-10-15

Lazarus, Ira S.

Internal-combustion engines

Valve

Valve head cooperates with manifold

251359, 251368, 75231, F01L 302

Patent

active

045467374

ABSTRACT:
A valve-seat insert for internal combustion engines comprises a double layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with the valve-seat layer and adapted to be seated in a cylinder head of an engine. The valve-seat layer is composed of a sintered alloy of a high heat resistance and a high wear resistance having a composition comprising, by weight, 4 to 8% Co, 0.6 to 1.6% Cr, 4 to 8% Mo, 1 to 3% Ni, 0.3 to 1.5% C, 0.2 to 0.6% Ca, and the balance being substantially Fe, the additives, Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a hard Fe-Mo alloy dispersed in the Fe matrix. The base layer is composed of a sintered alloy of a higher heat resistance and a higher wear resistance than those of the valve-seat layer and having a composition comprising, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, balance substantially Fe. The sintered alloy for the base layer may have a compositions further including 2 to 4% Cu.

REFERENCES:
patent: 3856478 (1974-12-01), Iwata et al.
patent: 3982905 (1976-09-01), Osawa et al.
patent: 4035159 (1976-06-01), Hashimoto et al.
patent: 4346684 (1982-08-01), Vossieck
patent: 4424953 (1984-01-01), Takagi et al.
Chem. Abs., 55-Ferrous Metals vol. 87:139209q; "Powder Metallurgy Materials for Exhaust Valve Seat Rings Performing with Lead-Free Gasoline," Mod. Dev. Powder Metall.

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