US4556022A
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: 1985-12-03
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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
2026-10-24 17:35
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: 22
Claim 1
Independent Claim
58 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, and wherein the coated layer comprises a double structure.
Claim 2
Dependent Claim
58 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, and wherein the coated layer comprises a double structure.
Claim 3
Dependent Claim
22 words
The valve of claim 1, wherein an upper layer of said double structure is ceramic and a lower lower layer is metal.
Claim 4
Dependent Claim
21 words
The valve of claim 1, wherein an upper layer is ceramic and metal complex layer and a lower layer is metal.
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
58 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, and wherein the coated layer comprises a triple structure.
Claim 7
Dependent Claim
58 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, and wherein the coated layer comprises a triple structure.
Claim 8
Dependent Claim
26 words
The valve of claim 5 wherein an upper layer is ceramic, a lower layer is metal, and a middle layer is ceramic and metal complex layer.
Claim 9
Dependent Claim
26 words
The valve of claim 5, wherein an upper layer and a middle layer are of ceramic and metal complex, and a lower layer is of metal.
Claim 10
Dependent Claim
19 words
The valve of claim 5, wherein an upper layer is ceramic, and middle and lower layers are of metal.
Claim 11
Dependent Claim
22 words
The valve of claim 5, wherein an upper layer is ceramic and metal complex layer, and middle and lower layers are metal.
Claim 12
Dependent Claim
15 words
The valve of claim 5, wherein said coated layer is subjected to press heat treatment.
Claim 13
Dependent Claim
59 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, and wherein the coated layer comprises at least four layers.
Claim 14
Dependent Claim
59 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, and wherein the coated layer comprises at least four layers.
Claim 15
Dependent Claim
34 words
The valve of claim 11, wherein an upper layer is of ceramic, a lower layer is metal and middle layers are ceramic and metal complex having a higher ceramic density toward an upper surface.
Claim 16
Dependent Claim
21 words
The valve of claim 11, wherein a lowest layer is of metal, and other layers are of ceramic and metal complex.
Claim 17
Dependent Claim
25 words
The valve of claim 11, wherein a complex layer at a lower layer is of metal and other layers are of metal and ceramic complex.
Claim 18
Dependent Claim
32 words
The valve of claim 11, wherein a complex layer at a lower layer is of metal, and an upper most layer is ceramic, and other layers are of metal and ceramic complex.
Claim 19
Dependent Claim
23 words
The valve of claim 11, wherein layers at an upper side are of ceramic and metal complex, and other layers are of metal.
Claim 20
Dependent Claim
18 words
The valve of claim 11, wherein an uppermost layer is of ceramic, and other layers are of metal.
Claim 21
Dependent Claim
20 words
The valve of claim 11, wherein an uppermost layer is ceramic and metal complex, and other layers are of metal.
Claim 22
Dependent Claim
15 words
The valve of claim 11, wherein said coated layer is subjected to press heat treatment.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |