US4554898A
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 becomes 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
2026-10-23 18:54
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/22; F02; F02B; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0403; F05C2201/0415; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0895
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
An exhaust valve for a Diesel engine, wherein a seat face thereof is formed with coated layer comprising ceramic and metal, the coated layer increasing in density of ceramic toward an upper surface thereof, wherein the coated layer comprises a plurality of layers which each vary in ceramic density.
Claim 2
Dependent Claim
49 words
An exhaust valve for a Diesel engine, wherein a seat face thereof is formed with coated layer comprising ceramic and metal, the coated layer increasing in density of ceramic toward an upper surface thereof, wherein the coated layer comprises a plurality of layers which each vary in ceramic density.
Claim 3
Dependent Claim
15 words
The valve of claim 1, wherein the coated layer comprises ceramic at an uppermost layer.
Claim 4
Dependent Claim
21 words
The valve of claim 1, wherein the coated layer comprises a ceramic and metal complex layer at an upper most layer.
Claim 5
Dependent Claim
15 words
The valve of claim 1, wherein said coated layer is subjected to press heat treatment.
Claim 6
Dependent Claim
22 words
The valve of claim 1, wherein the coated layer comprises a ceramic and metal complex layer, and a lowermost layer of metal.
Claim 7
Dependent Claim
18 words
The valve of claim 5, wherein the ceramic and metal complex layer comprises ceramic grains and metal grains.
Claim 8
Dependent Claim
20 words
The valve of claim 5, wherein the ceramic and metal complex layer comprises ceramic grains and metal covered ceramic grains.
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
17 words
The valve of claim 5, wherein metals of two or more kinds are used as said metal.
Claim 12
Dependent Claim
15 words
The valve of claim 10, wherein metal grains of more than two kinds are used.
Claim 13
Dependent Claim
19 words
The valve of claim 10, wherein ceramic grains covered with metals of more than two different kinds are used.
Claim 14
Dependent Claim
28 words
The valve of claim 10, wherein metal having excellent corrosion resistability is used at the surface side, and metal having excellent strength is used at the lower side.
Claim 15
Dependent Claim
24 words
The valve of claim 10, wherein said metal grains are of different kinds, and wherein said metal covered ceramic grains are of different kinds.
Claim 16
Dependent Claim
15 words
The valve of claim 14, wherein said metal grains are of more than two kinds.
Claim 17
Dependent Claim
17 words
The valve of claim 14, wherein said metal covered ceramic grains are of more than two kinds.
References Cited (Backward Citations)
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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) | 1988-11-25 | 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 |