US4941439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion chamber surfaces of an internal combustion engine
Assignee: Oktan AB
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Filing: 1988-05-05
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Granted: 1990-07-17
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Expires: 2008-05-05
Abstract
Abstract An arrangement in combustion chamber surfaces of an internal combustion engine, wherein these surfaces exhibit at least partially a thin surface layer (2) which will influence the octane/cetane rating requirement of the engine in a manner to limit the knocking tendency of the engine. The surface layer (2) comprises a material of low reflectivity and high absorptivity in respect of electromagnetic waves having a wavelength of up to at least 7 μm. The surace layer (2) has located therebeneath a layer (3) which functions as a transient heat buffer and alternately absorbs heat from and emits heat to the surface layer (2).
Inventors
- 👤 Jan Wicen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:56
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/10; F02F3/12; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
168 words
An arrangement in combustion chamber surfaces of an internal combustion engine, comprising: a thin surface layer provided at least partially on the combustion chamber surfaces of the engine, and which will influence the octane/cetane rating requirement of the engine in a manner to limit the knocking tendency of the engine; said thin surface layer (2) comprising a material of low reflectivity and high absorptivity in respect of electromagnetic waves having a wavelength of up to at least 7 μm, and high emissivity at wavelengths longer than 7 μm; and a further layer (3) located beneath said thin surface layer (2) for accumulating heat given off by said thin surface layer (2) during a process of fuel combustion in the engine so as to counteract a rise in temperature of said thin surface layer (2) and to heat said thin surface layer (2) during a part of the combustion cycle in which the temperature in the combustion chamber is lower that the temperature of said thin surface layer (2).
Claim 2
Dependent Claim
168 words
An arrangement in combustion chamber surfaces of an internal combustion engine, comprising: a thin surface layer provided at least partially on the combustion chamber surfaces of the engine, and which will influence the octane/cetane rating requirement of the engine in a manner to limit the knocking tendency of the engine; said thin surface layer (2) comprising a material of low reflectivity and high absorptivity in respect of electromagnetic waves having a wavelength of up to at least 7 μm, and high emissivity at wavelengths longer than 7 μm; and a further layer (3) located beneath said thin surface layer (2) for accumulating heat given off by said thin surface layer (2) during a process of fuel combustion in the engine so as to counteract a rise in temperature of said thin surface layer (2) and to heat said thin surface layer (2) during a part of the combustion cycle in which the temperature in the combustion chamber is lower that the temperature of said thin surface layer (2).
Claim 3
Dependent Claim
17 words
The arrangement of claim 1, further comprising a heat insulating layer (4) underlying said further layer (3).
Claim 4
Dependent Claim
17 words
The arrangement of claim 2, wherein said heat insulating layer (4) is a thin layer of nickel.
Claim 5
Dependent Claim
37 words
The arrangement of claim 1, wherein: said thin surface layer (2) comprises black chromium and has a thickness of about 4 μm; and said further layer (3) comprises copper and has a thickness of about 1 mm.
Claim 6
Dependent Claim
17 words
The arrangement of claim 4, further comprising a heat insulating layer (4) underlying said further layer (3).
Claim 7
Dependent Claim
17 words
The arrangement of claim 5, wherein said heat insulating layer (4) is a thin layer of nickel.
Claim 8
Dependent Claim
37 words
The arrangement of claim 1, wherein: said thin surface layer (2) comprises black chromium and has a thickness of about 4 μm; and said further layer (3) comprises silver and has a thickness of about 1 mm.
Claim 9
Dependent Claim
17 words
The arrangement of claim 7, further comprising a heat insulating layer (4) underlying said further layer (3).
Claim 10
Dependent Claim
17 words
The arrangement of claim 8, wherein said heat insulating layer (4) is a thin layer of nickel.
Claim 11
Dependent Claim
18 words
The arrangement of claim 1, wherein said further layer (3) is thicker than said thin surface layer (2).
Claim 12
Dependent Claim
18 words
The arrangement of claim 4, wherein said further layer (3) is thicker than said thin surface layer (2).
Claim 13
Dependent Claim
18 words
The arrangement of claim 7, wherein said further layer (3) is thicker than said thin surface layer (2).
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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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |