US3633577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engines
Assignee: Individual
•
Filing: 1970-03-06
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Granted: 1972-01-11
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Expires: 1990-03-06
Abstract
Abstract This invention relates to a four-valve combustion chamber for an internal-combustion engine, to a cylinder head and internalcombustion engine incorporating the same, and to a method of forming the same. The combustion chamber comprises a pair of elongated cavities disposed side by side with their longer axes parallel and with a ridge therebetween. The cavity, at least at each end zone thereof, is of part-spherical configuration, and each end zone is formed with an opening therein provided with a valve seat, the axis of which is normal to the part-spherical surface.
Inventors
- 👤 Sanzio Pio Vincenzo Piatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:30
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A four-valve combustion chamber for an internal-combustion engine, which is formed with two elongated cavities disposed side-by-side with their longer axes parallel and with a ridge between the cavities, the cross section of each cavity being substantially arcuate in the direction of its shorter axis and arcuate at least at each end zone in the direction of its longer axis, and an opening in each said end zone which constitutes, or is fitted with, a valve seat.
Claim 2
Dependent Claim
77 words
A four-valve combustion chamber for an internal-combustion engine, which is formed with two elongated cavities disposed side-by-side with their longer axes parallel and with a ridge between the cavities, the cross section of each cavity being substantially arcuate in the direction of its shorter axis and arcuate at least at each end zone in the direction of its longer axis, and an opening in each said end zone which constitutes, or is fitted with, a valve seat.
Claim 3
Dependent Claim
32 words
A combustion chamber as claimed in claim 1, wherein the two cavities are identical, and are each of part-spherical configuration, the axes of the valve seats being normal to said part-spherical surfaces.
Claim 4
Dependent Claim
36 words
A combustion chamber as claimed in claim 1, wherein the two end zones of each cAvity are of part-spherical configuration with the centers of the part-spheres being spaced apart in the direction of said longer axis.
Claim 5
Dependent Claim
65 words
A combustion chamber as claimed in claim 1, wherein a passage adapted to receive a sparking plug opens into the chamber at the apex of the ridge in a substantially central position relative to the valve seats, and wherein the side of each cavity remote from the ridge is formed by a flat side surface extending in the direction of said ridge and longer axis.
Claim 6
Dependent Claim
144 words
An internal-combustion engine, having a plurality of in-line cylinders, and at least one cylinder head provided with two inlet and two exhaust valves for each cylinder, wherein each of the plural combustion chambers in said at least one cylinder head is formed with two elongated cavities disposed side-by-side with a ridge therebetween, the longer axis of each of said cavities extending transversely to the axis of rotation of the engine crankshaft, the cross section of each cavity being substantially arcuate in the direction of its shorter axis, and arcuate at least at each end zone in the direction of its longer axis, with the centers of the arcs of corresponding end zones of the cavities lying on a common line parallel to the axis of rotation of the engine, and each cavity having a valve seat in each end zone with valves cooperating therewith.
Claim 7
Dependent Claim
144 words
An internal-combustion engine, having a plurality of in-line cylinders, and at least one cylinder head provided with two inlet and two exhaust valves for each cylinder, wherein each of the plural combustion chambers in said at least one cylinder head is formed with two elongated cavities disposed side-by-side with a ridge therebetween, the longer axis of each of said cavities extending transversely to the axis of rotation of the engine crankshaft, the cross section of each cavity being substantially arcuate in the direction of its shorter axis, and arcuate at least at each end zone in the direction of its longer axis, with the centers of the arcs of corresponding end zones of the cavities lying on a common line parallel to the axis of rotation of the engine, and each cavity having a valve seat in each end zone with valves cooperating therewith.
Claim 8
Dependent Claim
84 words
An engine as claimed in claim 5, wherein the cavities are of identical part-spherical configuration, the axes of the valve seats being normal to the part-spherical surfaces, wherein a passage adapted to receive a sparking plug opens into the chamber at the apex of the ridge in a substantially central position relative to the valve seats, and wherein the side of each cavity remote from the ridge is formed by a flat side surface extending in the direction of said ridge and longer axis.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |