EP0130604A1
Expired / Lapsed
EP
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Valve-seat insert for internal combustion engines
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-07-02
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Granted: —
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Expires: 2004-07-02
Abstract
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, balance 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.
Inventors
- 👤 Nobuhito C/O Itami Works Kuroishi
- 👤 Naoki C/O Itami Works Motooka
- 👤 Tetsuya Suganuma
- 👤 Koji Kazuoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:53
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/22; B; B22; B22F; B22F7/00; B22F7/06; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A valve-seat insert for internal combustion engines comprising 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 the engine, said valve-seat layer being composed of a sintered alloy of a high heat resistance and a high wear resistance, said base layer being composed of a sintered alloy of a higher heat resistance and a higher wear resistance than the valve-seat layer.
Claim 2
Dependent Claim
86 words
A valve-seat insert for internal combustion engines comprising 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 the engine, said valve-seat layer being composed of a sintered alloy of a high heat resistance and a high wear resistance, said base layer being composed of a sintered alloy of a higher heat resistance and a higher wear resistance than the valve-seat layer.
Claim 3
Dependent Claim
174 words
A valve-seat insert for internal combustion engines comprising a double layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with said valve-seat layer and adapted to be seated in a cylinder head of an engine, said valve-seat layer being 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, balance substantially Fe, said Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a Fe-Mo hard alloy dispersed in the Fe matrix of the valve-seat layer, said base layer being 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 3to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, balance substantially Fe.
Claim 4
Dependent Claim
174 words
A valve-seat insert for internal combustion engines comprising a double layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with said valve-seat layer and adapted to be seated in a cylinder head of an engine, said valve-seat layer being 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, balance substantially Fe, said Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a Fe-Mo hard alloy dispersed in the Fe matrix of the valve-seat layer, said base layer being 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 3to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, balance substantially Fe.
Claim 5
Dependent Claim
200 words
A valve-seat insert for internal combustion engines comprising a double layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with said valve-seat layer and adapted to be seated in a cylinder head of an engine, said valve-seat layer being 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, balance substantially Fe, said Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a Fe-Mo hard alloy dispersed in the Fe matrix of the valve-seat layer, said . base layer being composed of a sintered alloy of a higher heat resistance and a higher wear resistance than the valve-seat layer having a dimensional change rate in . sintering approximately equal to that of the valve-seat layer, said sintered alloy for forming the base layer having a composition comprising, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, 2 to 4% Cu, balance substantially Fe.
Claim 6
Dependent Claim
200 words
A valve-seat insert for internal combustion engines comprising a double layered, sintered alloy composed of a valve-seat layer on which a valve is seated, and a base layer integrated with said valve-seat layer and adapted to be seated in a cylinder head of an engine, said valve-seat layer being 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, balance substantially Fe, said Co, Cr and Mo being present mainly in a form of a Co-Cr-Mo hard alloy and a Fe-Mo hard alloy dispersed in the Fe matrix of the valve-seat layer, said . base layer being composed of a sintered alloy of a higher heat resistance and a higher wear resistance than the valve-seat layer having a dimensional change rate in . sintering approximately equal to that of the valve-seat layer, said sintered alloy for forming the base layer having a composition comprising, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C, 2 to 4% Cu, balance substantially Fe.
References Cited (Backward Citations)
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