Method for making a valve-seat insert for internal combustion en

Details Method for making a valve-seat insert for internal combustion en Method for making a valve-seat insert for internal combustion en

1986-11-21

1988-04-05

Rosenbaum, Mark

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29DIG31, 123188S, 419 6, 419 27, 419 48, 419 57, B21D 5300

Patent

active

047349689

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 1.5% Cr, 4 to 8% Mo, 1 to 3% Ni, 0.3 to 1.5% C, 0.2 to 0.6% Ca, and the balance of Fe and inevitable impurities, 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 creep 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, and the balance of Fe and inevitable impurities. At least the valve-seat layer of the double-layered, sintered alloy is being fusion-infiltrated with copper.

REFERENCES:
patent: 3790352 (1974-02-01), Niimi et al.
patent: 3795511 (1974-03-01), Niimi et al.
patent: 4419413 (1983-12-01), Ebihara
patent: 4424953 (1984-01-01), Takagi et al.
patent: 4472350 (1984-09-01), Urano
patent: 4509722 (1985-04-01), Ebihara
patent: 4602956 (1986-07-01), Partlow et al.

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