US4554897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust valve for Diesel engine and production thereof
Assignee: JFE Engineering Corp
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Filing: 1985-02-25
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Granted: 1985-11-26
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Expires: 2005-02-25
Abstract
Abstract This invention is concerned with an exhaust valve for Diesel engine and a method thereof, in which a seat of the exhaust valve is formed with coated layer comprising ceramics and metals, the layer becoming thicker in density of ceramics as coming nearly to the surface thereof. The seat may be formed with the coated layer by subjecting to pressing-heating treatment after coating. This kind of the exhaust valve is provided by coating ceramics and metals onto a seating portion of the mother material such that ceramics become thicker in density as advancing to the surface, and heating the coated layer in electric conductivity while pressing the layer with the tool in non oxidizing atmosphere.
Inventors
- 👤 Takemi Yamada
- 👤 Tamataro Satoh
- 👤 Masaaki Mizushina
- 👤 Koji Toyota
- 👤 Hiromi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:35
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/22; F01L3/02; F01L3/04; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; F02B; F02B3/00; F02B3/06; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0895
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
48 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises ceramics at an uppermost layer.
Claim 2
Dependent Claim
48 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises ceramics at an uppermost layer.
Claim 3
Dependent Claim
15 words
The valve of claim 1, wherein said coated layer is subjected to press heat treatment.
Claim 4
Dependent Claim
53 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises a ceramic and metal complex layer at an uppermost layer.
Claim 5
Dependent Claim
53 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises a ceramic and metal complex layer at an uppermost layer.
Claim 6
Dependent Claim
15 words
The valve of claim 3, wherein said coated layer is subjected to press heat treatment.
Claim 7
Dependent Claim
55 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises a ceramic and metal complex, and a lowest layer is of metal.
Claim 8
Dependent Claim
55 words
Exhaust valve for Diesel engine, wherein a seat face thereof is formed with at least one coated layer comprising ceramics and metals, the coated layer increasing substantially constantly in density of said ceramics towards an upper surface thereof, wherein the coated layer comprises a ceramic and metal complex, and a lowest layer is of metal.
Claim 9
Dependent Claim
20 words
The valve of claim 5, wherein the ceramic and metal complex layer comprises metal covered ceramic grains and metal grains.
Claim 10
Dependent Claim
18 words
The valve of claim 5, wherein the ceramic and metal complex layer comprises ceramic grains and metal grains.
Claim 11
Dependent Claim
15 words
The valve of claim 5, wherein said coated layer is subjected to press heat treatment.
Claim 12
Dependent Claim
17 words
The valve of claim 5, wherein metals of more than two kinds are used as the metals.
Claim 13
Dependent Claim
15 words
The valve of claim 9, wherein metal grains of more than two kinds are used.
Claim 14
Dependent Claim
19 words
The valve of claim 9, wherein ceramic grains covered with metal of more than two different kinds are used.
Claim 15
Dependent Claim
32 words
The valve of claim 9, wherein metals of metal grains and metals of metal covered ceramics are of different kinds in the coated layer comprising metal grains and metal covered ceramic grains.
Claim 16
Dependent Claim
15 words
The valve of claim 12, wherein metal grains of more than two kinds are used.
Claim 17
Dependent Claim
21 words
The valve of claim 12, wherein metal covered ceramic grains of more than two kinds covered with different metals are used.
Claim 18
Dependent Claim
30 words
The valve of claim 12, wherein metal having excellent corrosion resistability are used at an upper surface side, and metals having excellent strength are used at a lower surface side.
References Cited (Backward Citations)
US2273250A
Cited
US3990860A
Cited
US4109031A
Cited
DE2856232A1
Cited
US4269903A
Cited
US4471017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |