US4546737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve-seat insert for internal combustion engines
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-06-29
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Granted: 1985-10-15
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Expires: 2004-06-29
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, 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.
Inventors
- 👤 Koji Kazuoka
- 👤 Testuya Suganuma
- 👤 Naoki Motooka
- 👤 Nobuhito Kuroishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:46
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
138 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 having a radial crushing strength which is higher than that of the valve-seat layer and not less than 100 kgf/mm 2 at room temperature, but not less than 80 kgf/mm 2 at 500° C., said sintered alloy of the base layer comprising, by weight, 11 to 15% or Cr, 0.4 to 2.0% of Mo, 0.05 to 0.3% of C, and the balance being substantially Fe.
Claim 2
Dependent Claim
138 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 having a radial crushing strength which is higher than that of the valve-seat layer and not less than 100 kgf/mm 2 at room temperature, but not less than 80 kgf/mm 2 at 500° C., said sintered alloy of the base layer comprising, by weight, 11 to 15% or Cr, 0.4 to 2.0% of Mo, 0.05 to 0.3% of C, and the balance being substantially Fe.
Claim 3
Dependent Claim
22 words
A valve-seat insert according to claim 1, wherein the sintered alloy of said base layer further comprises 2 to 4% of Cu.
Claim 4
Dependent Claim
83 words
A valve-seat insert according to claim 1, wherein the sintered alloy of said valve-seat layer comprises, by weight, 4 to 8% of Co, 0.6 to 1.5% of Cr, 4 to 8% of Mo, 1 to 3% of Ni, 0.3 to 1.5% of C, 0.2 to 0.6% of Ca, and the 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.
Claim 5
Dependent Claim
209 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 intergrated 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, the sintered alloy of said valve-seat layer consisting esstentially of, 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 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 having a radial crushing strength which is higher than that of the valve-seat layer and not less than 100 kgf/mm 2 at room temperature, but not less than 80 kgf/mm 2 at 500° C., the sintered alloy of said base layer consisting essentially of, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C and the balance consisting substantially of Fe.
Claim 6
Dependent Claim
209 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 intergrated 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, the sintered alloy of said valve-seat layer consisting esstentially of, 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 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 having a radial crushing strength which is higher than that of the valve-seat layer and not less than 100 kgf/mm 2 at room temperature, but not less than 80 kgf/mm 2 at 500° C., the sintered alloy of said base layer consisting essentially of, by weight, 11 to 15% Cr, 0.4 to 2.0% Mo, 0.05 to 0.3% C and the balance consisting substantially of Fe.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |