US4256068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oblong piston and cylinder for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1979-11-06
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Granted: 1981-03-17
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Expires: 1999-11-06
Abstract
Abstract A four cylinder four cycle spark ignition engine has oblong pistons each mounted to reciprocate in sliding contact with an oblong cylinder. Intake valves in a series are positioned in a straight line on one side of and parallel to a central plane extending through the longest dimension of each oblong cylinder. Exhaust valves in a series are positioned in a straight line on the other side of and parallel to that central plane. A cam shaft operates all of the intake valves and another cam shaft operates all of the exhaust valves.
Inventors
- 👤 Shoichiro Irimajiri
- 👤 Takeo Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:42
CPC Classifications
F; F02; F02F; F02F1/00; F01; F01L; F01L1/00; F01L1/12; F01L1/18; F01L1/26; F01L1/265; F02F1/18; F02F1/183; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
In an internal combustion engine, the combination of: stationary walls forming an oblong cylinder, an oblong piston slidably mounted to reciprocate in sliding contact within said cylinder, said walls and piston cooperating to form a combustion chamber, a series of more than two intake valves positioned on a first side of a central plane extending through the longest dimension of said oblong cylinder in a substantially straight line on said first side of and parallel to said plane, a series of more than two exhaust valves positioned on the second side of said plane in a substantially straight line on said second side of and parallel to said plane, each of said valves having a valve head positioned in said combustion chamber and having a valve stem slidably mounted in said stationary walls, and a crankshaft, said crankshaft being parallel to said central plane.
Claim 2
Dependent Claim
144 words
In an internal combustion engine, the combination of: stationary walls forming an oblong cylinder, an oblong piston slidably mounted to reciprocate in sliding contact within said cylinder, said walls and piston cooperating to form a combustion chamber, a series of more than two intake valves positioned on a first side of a central plane extending through the longest dimension of said oblong cylinder in a substantially straight line on said first side of and parallel to said plane, a series of more than two exhaust valves positioned on the second side of said plane in a substantially straight line on said second side of and parallel to said plane, each of said valves having a valve head positioned in said combustion chamber and having a valve stem slidably mounted in said stationary walls, and a crankshaft, said crankshaft being parallel to said central plane.
Claim 3
Dependent Claim
188 words
In an internal combustion engine, the combination of: stationary walls forming an oblong cylinder, an oblong piston slidably mounted to reciprocate in sliding contact within said cylinder, said walls and piston cooperating to form a combustion chamber, a series of more than two intake valves positioned on a first side of a central plane extending through the longest dimension of said oblong cylinder in a substantially straight line on said first side of and parallel to said plane, a series of more than two exhaust valves positioned on the second side of said plane in a substantially straight line on said second side of and parallel to said plane, each of said valves having a valve head positioned in said combustion chamber and having a valve stem slideably mounted in said stationary walls, and a crankshaft, said crankshaft being parallel to said central plane, the number of said intake valves and the number of said exhaust valves being equal and each said intake valve being paired with a said exhaust valve such that each said pair is positioned in a straight line substantially perpendicular to said central plane.
Claim 4
Dependent Claim
188 words
In an internal combustion engine, the combination of: stationary walls forming an oblong cylinder, an oblong piston slidably mounted to reciprocate in sliding contact within said cylinder, said walls and piston cooperating to form a combustion chamber, a series of more than two intake valves positioned on a first side of a central plane extending through the longest dimension of said oblong cylinder in a substantially straight line on said first side of and parallel to said plane, a series of more than two exhaust valves positioned on the second side of said plane in a substantially straight line on said second side of and parallel to said plane, each of said valves having a valve head positioned in said combustion chamber and having a valve stem slideably mounted in said stationary walls, and a crankshaft, said crankshaft being parallel to said central plane, the number of said intake valves and the number of said exhaust valves being equal and each said intake valve being paired with a said exhaust valve such that each said pair is positioned in a straight line substantially perpendicular to said central plane.
Claim 5
Dependent Claim
60 words
The combination set forth in claim 2 in which there are an even number of said intake valves and in which there is a plurality of spark plugs wherein the number of said spark plugs is equal to one-half the number of intake valves, said spark plugs being positioned centrally between two said intake valves and two said exhaust valves.
Claim 6
Dependent Claim
60 words
The combination set forth in claim 2 in which there are an odd number of said intake valves and in which there is a plurality of spark plugs, the number of spark plugs being equal to one less than the number of intake valves, said spark plugs being positioned centrally between two said intake valves and two said exhaust valves.
Claim 7
Dependent Claim
40 words
The combination set forth in claim 1 or claim 2 in which a plurality of spark plugs is provided within a region which is enclosed by the lines connecting the centers of the outermost of said intake and exhaust valves.
Claim 8
Dependent Claim
30 words
The combination of claim 1 or claim 2 including a first cam to drive all of said intake valves and a second cam to drive all of said exhaust valves.
Claim 9
Dependent Claim
21 words
The combination set forth in claim 1 or claim 2 further including two connecting rods connecting said piston to said crankshaft.
Claim 10
Dependent Claim
22 words
The combination set forth in claim 1 or claim 2 including a plurality of said combustion chambers with substantially identical valve patterns.
Claim 11
Dependent Claim
15 words
The combination of claim 8 further including two connecting rods associated with each said piston.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |