US4811708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion space for a reciprocating piston internal combustion engine
Assignee: Dr Ing HCF Porsche AG
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Filing: 1988-01-29
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Granted: 1989-03-14
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Expires: 2008-01-29
Abstract
Abstract A combustion space of a reciprocating piston internal combustion engine in which the combustion development of the internal combustion engine, as also the knock limit, is positively influenced by a defined configuration of the combustion space and arrangement of the ignition and injection devices, and more particularly in such a manner that the fuel necessary for the operation of the internal combustion engine can be characterized by a lower octane number.
Inventors
- 👤 Dusan Gruden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:18
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02B; F02B23/00; F02B23/08; F02B23/10; F02B23/104; F02F3/00; F02F3/26; F02B75/00; F02B75/12; F02B2075/125; F02B2275/00; F02B2275/40; F02F2001/241; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A combustion space for a reciprocating piston internal combustion engine which is provided between a cylinder head and a piston and is equipped with ignition and plural injection means, the gas-exchange control in the combustion space taking place by two inlet valves and two exhaust valves of the cylinder head, the ignition means extending in a center longitudinal axis of the cylinder, each injection means extending essentially at an identical angle to the center longitudinal axis of the cylinder, the piston including on the side facing the cylinder head a substantially spherically shaped recess whose radius lies substantially on the center longitudinal axis of the cylinder, and the piston extending on the side facing the cylinder head outside of the recess up to a roof-shaped combustion space boundary of the cylinder head for the formation of a squeeze area.
Claim 2
Dependent Claim
139 words
A combustion space for a reciprocating piston internal combustion engine which is provided between a cylinder head and a piston and is equipped with ignition and plural injection means, the gas-exchange control in the combustion space taking place by two inlet valves and two exhaust valves of the cylinder head, the ignition means extending in a center longitudinal axis of the cylinder, each injection means extending essentially at an identical angle to the center longitudinal axis of the cylinder, the piston including on the side facing the cylinder head a substantially spherically shaped recess whose radius lies substantially on the center longitudinal axis of the cylinder, and the piston extending on the side facing the cylinder head outside of the recess up to a roof-shaped combustion space boundary of the cylinder head for the formation of a squeeze area.
Claim 3
Dependent Claim
50 words
A combustion space according to claim 1, wherein the size of the spherically shaped recess is determined by the following relationship R=(about 0.25 to about 0.45) D whereby R is the radius of the recess and D the diameter of the piston and/or of the bore of the cylinder. PG,7
Claim 4
Dependent Claim
29 words
A combustion space according to claim 2, wherein the point of origin of the radius of the recess is located approximately on the peak of the combustion space boundary.
Claim 5
Dependent Claim
19 words
A combustion space according to claim 1, wherein the piston includes recesses within the area of the injection means.
Claim 6
Dependent Claim
23 words
A combustion space according to claim 1, wherein the size of the squeeze area amounts to at least 12% of the piston area.
Claim 7
Dependent Claim
19 words
A combustion space according to claim 3, wherein the piston includes recesses within the area of the injection means.
Claim 8
Dependent Claim
23 words
A combustion space according to claim 6, wherein the size of the squeeze area amounts to at least 12% of the piston area.
Claim 9
Dependent Claim
19 words
A combustion space according to claim 2, wherein the piston includes recesses within the area of the injection means.
Claim 10
Dependent Claim
23 words
A combustion space according to claim 2, wherein the size of the squeeze area amounts to at least 12% of the piston area.
References Cited (Backward Citations)
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Cited
US1960362A
Cited
US2338959A
Cited
GB726450A
Cited
US2803237A
Cited
FR1142711A
Cited
US3633577A
Cited
US3999532A
Cited
US4123997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |