US4809663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance internal combustion engine
Assignee: MODENA MOTORI Srl
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Filing: 1986-11-04
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Granted: 1989-03-07
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Expires: 2006-11-04
Abstract
Abstract A high performance, high reliability internal combustion engine comprises a 90-degree Vee-six cylinder block with six valves per cylinder, three intake and three exhaust ones, arranged circumferentially to the cylinder and having the top ends of their stems aligned along parallel axes.
Inventors
- 👤 Alejandro De Tomaso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02F1/242; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02F2001/244; F02F2001/245; F02F2200/00; F02F2200/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
An internal combustion engine comprising: a plurality of engine cylinders each having respective intake and exhaust ducts opening into a combustion chamber formed in a cylinder head; respective valves each having a valve head and stem and acting with said valve heads in said intake and exhauast ducts at said combustion chamber; driving means for said valves; each cylinder having six of said valves, three of which are arranged to act in an intake duct and three in an exhaust duct, said valves having their valve heads arranged circumferentially to said engine cylinder and in a circular pattern, and the top ends of their respective valve stems aligned along parallel axes, said combustion chamber being formed with a frustoconically shaped upper region topped by a domed portion and an ignition spark plug seat formed centrally in said domed portion at a barycentric location with respect to said valves, and said valves being equally spaced from the apex of said domed portion.
Claim 2
Dependent Claim
161 words
An internal combustion engine comprising: a plurality of engine cylinders each having respective intake and exhaust ducts opening into a combustion chamber formed in a cylinder head; respective valves each having a valve head and stem and acting with said valve heads in said intake and exhauast ducts at said combustion chamber; driving means for said valves; each cylinder having six of said valves, three of which are arranged to act in an intake duct and three in an exhaust duct, said valves having their valve heads arranged circumferentially to said engine cylinder and in a circular pattern, and the top ends of their respective valve stems aligned along parallel axes, said combustion chamber being formed with a frustoconically shaped upper region topped by a domed portion and an ignition spark plug seat formed centrally in said domed portion at a barycentric location with respect to said valves, and said valves being equally spaced from the apex of said domed portion.
Claim 3
Dependent Claim
26 words
An engine according to claim 1, characterised in that formed in said cylinder head are substantially hemispherical impressions arranged around the valve heads of said valves.
Claim 4
Dependent Claim
43 words
An engine according to claim 1, characterised in that formed in said cylinder head are intercommunicating cavities located near said intake and exhaust ducts and around said seat accommodating the ignition spark plug, being intended to be swept through by a cooling fluid.
Claim 5
Dependent Claim
84 words
An engine according to claim 1, characterised in that said valve diriving means comprise rocker arms having one end journalled on a pin and a juxtaposed end configured with three arms, each arm being arranged to act on the valve stem of a respective valve by the action of a cam on a camshaft, each rocker arm being retained axially on the pin by two shoulders formed on the pin itself, a wave spring washer being interposed to the rocker arm and each shoulder.
Claim 6
Dependent Claim
32 words
An engine according to claim 4, characterised in that each cam on the camshaft has a hole formed radially therethrough and in fluid communication with a conduit formed axially through the camshaft.
Claim 7
Dependent Claim
37 words
An engine according to claim 5, characterised in that each rocker arm is provided, at the pin, with a respective flared cavity facing upwards and being open downwardly to the pin, said cavity forming an oil reservoir.
Claim 8
Dependent Claim
43 words
An engine according to claim 2, characterized in that formed in said cylinder head are interconnecting cavities located near said intake and exhaust ducts and around said seat accommodating the ignition spark plug, being intended to be swept through by a cooling fluid.
References Cited (Backward Citations)
GB296125A
Cited
US3351044A
Cited
US4346678A
Cited
US4658780A
Cited
US4519365A
Cited
US4638774A
Cited
US4655177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |