Internal-combustion engines – Combustion chamber means combined with air-fuel mixture... – Air or combustible mixture entering the combustion chamber...
Patent
1991-08-30
1993-04-27
Cross, E. Rollins
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
Air or combustible mixture entering the combustion chamber...
123308, 123302, E02B 1500
Patent
active
052052591
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to internal combustion engines and more particularly to a modified cylinder head for the reduction of heat rejection thereof.
2. Background Art
It is well known in the art that a reduction of heat rejection from the combustion chamber of an internal combustion engine is an important step in increasing thermal efficiencies associated with the engine. Several advantages result from the increase in thermal efficiency, including: reduced fuel consumption, reduced cooling system requirements, and enhanced exhaust energy recovery effectiveness.
Multiple intake valves operatively associated in a common combustion chamber have been shown in prior art emphasizing the advantage of the design for achieving high output. The multiple intake valve designs fail to recognize the important relationship that exists between the cross-sectional areas of the intake and exhaust valve ports in reducing the heat rejection in an internal combustion engine.
It is the object of the present invention to recognize the advantages available in a multiple intake valve system while providing a design that will reduce the heat rejection, thereby increasing thermal efficiency of the engine.
DISCLOSURE OF THE INVENTION
The present invention provides a cylinder head adapted for use in an internal combustion engine for the reduction of heat rejection. The head includes an exhaust valve port means and an intake valve port means having effective cross-sectional areas. The cross-sectional area of the intake valve port means is larger than about 69% of the combined cross-sectional area of the intake and exhaust valve port means.
Another aspect of the present invention provides an internal combustion engine having a cylinder block that defines a bore. A cylinder head is attached to the cylinder block in closing relation to the cylinder bore. A piston is reciprocally mounted in the cylinder bore and defines with the cylinder block and the cylinder head a variable volume combustion chamber. An intake valve means is provided for admitting a constituent of a combustible mixture into the combustion chamber and an exhaust valve means is also provided for releasing exhaust gas from the combustion chamber. The present invention includes an exhaust valve port means, operatively associated with the exhaust valve means, and having an effective cross-sectional area. In addition to the exhaust valve port means, an intake valve port means, operatively associated with the intake valve means, is included having an effective cross-sectional area which is larger than about 69% of the combined cross-sectional area of the intake and exhaust valve ports means.
The present invention provides an improvement in the reduction of heat rejection by increasing the cross-sectional area of the intake valve to larger than about 69% of the combined cross-sectional area of the intake and exhaust valve ports. The improved reduction of heat rejection will increase thermal efficiency of the engine thereby reducing fuel consumption and cooling capacity requirements while increasing exhaust energy recovery effectiveness.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view taken along line 1--1 of FIG. 2 illustrating a cylinder head, valves, and valve arrangement of an internal combustion engine for the present invention.
FIG. 2 is an enlarged diagrammatic view taken along line 2--2 of the valve porting arrangement showing the intake valve port cross-sectional area being about 75% of the combined intake and exhaust valve ports cross-sectional area.
FIG. 3 is an enlarged diagrammatic view taken along line 2--2 of the valve porting arrangement showing the intake valve port cross-sectional area being about 70% of the combined intake and exhaust valve ports cross-sectional area.
FIG. 4 is a schematic view in perspective form showing the configuration of the passages.
BEST MODE FOR CARRYING OUT THE INVENTION
An internal combustion engine 10 is illustrated in FIG. 1 and is constructed in accordance with an embodiment of
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SAE Technical Paper #910296 Entitled "The Effects of Intake-Flow configuration on the Heat-Release and Heat-Transfer Characteristics of a Single-Cylinder Four-Valve S. I. Engine" Dated Feb. 25-Mar. 1, 1991.
Clarke John M.
Faletti James J.
Hackett David E.
Caterpillar Inc.
Charlton Diana L.
Cross E. Rollins
Solis Erick
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