US4018194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine piston with insulated combustion chamber
Assignee: Texaco Inc
•
Filing: 1975-01-06
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Granted: 1977-04-19
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Expires: 1995-01-06
Abstract
Abstract Piston for an internal combustion engine having an upper face which forms a part of an expandable combustion chamber. The piston is provided with a cavity or deep depression formed in the upper face to promote fuel-air mixing as well as to improve the combustion process within said combustion chamber. The cavity is formed within a cup-like insert member, so positioned within the piston body that the cup-like insert is substantially spaced or insulated from the piston body, thereby avoiding or minimizing heat loss to the piston walls.
Inventors
- 👤 Edward Mitchell
- 👤 John M. Cobb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:48
CPC Classifications
F; F02; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0603; F02F; F02F3/00; F02F3/10; F02F3/12; F02F3/14; F02B2023/0612; F02B23/0618; F02B23/0624; F02B23/0636; F02B23/0639; F02B23/0696; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
In a piston for an internal combustion engine which utilizes fuel injection to establish a combustible fuel-air mixture within the engine combustion chamber said piston including; a body with a head having a face which opens into a combustion chamber into which fuel is introduced to establish the combustible mixture, an insert member fixedly positioned within said piston body and being supportably spaced from the latter to define a thermal barrier whereby to substantially insulate said combustion chamber from the piston thereby to minimize heat flow therebetween, said insert member having means forming a recessed cavity therein which is communicated with said combustion chamber, said insert member further including an outer wall having a plurality of discretely spaced conical segments depending outwardly from said insert member wall and having the conical points of said segments at least partially embedded into the wall of said piston whereby said thermal barrier comprises an air gap.
Claim 2
Dependent Claim
153 words
In a piston for an internal combustion engine which utilizes fuel injection to establish a combustible fuel-air mixture within the engine combustion chamber said piston including; a body with a head having a face which opens into a combustion chamber into which fuel is introduced to establish the combustible mixture, an insert member fixedly positioned within said piston body and being supportably spaced from the latter to define a thermal barrier whereby to substantially insulate said combustion chamber from the piston thereby to minimize heat flow therebetween, said insert member having means forming a recessed cavity therein which is communicated with said combustion chamber, said insert member further including an outer wall having a plurality of discretely spaced conical segments depending outwardly from said insert member wall and having the conical points of said segments at least partially embedded into the wall of said piston whereby said thermal barrier comprises an air gap.
References Cited (Backward Citations)
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GB363516A
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GB442340A
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US2868181A
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US3259116A
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US3221722A
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US3398726A
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US3545341A
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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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |