Internal-combustion engines – Means to whirl fluid before – upon – or after entry into...
Reexamination Certificate
1999-04-06
2001-01-16
Solis, Erick (Department: 3747)
Internal-combustion engines
Means to whirl fluid before, upon, or after entry into...
C123S309000
Reexamination Certificate
active
06173695
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of cylinder heads for four-cycle internal combustion engines, and more particularly to a cylinder bead having a combustion chamber and intake port with deflecting features for improving combustion efficiency.
BACKGROUND OF THE INVENTION
Internal combustion engines generate power by igniting a mixture of fuel and air. In order to get the most power from the fuel, that is, for the most efficient operation, many factors involved in the combustion process must be optimized. These factors include the shapes of both the intake port and the combustion chamber, which determines the flow path of the intake charge before and after it enters the combustion. The manner in which the intake charge flows will affect speed of combustion and the percentage of the charge that is ignited during combustion.
Much research has gone into finding ways to increase engine efficiency by varying the shape of these features. Resulting improvements in combustion efficiency have yielded many benefits including cleaner exhaust emissions, improved fuel economy, lower engine running temperatures, increased torque, and increased horsepower.
There is clearly still a need for further improvements. For example, air pollution continues to be a serious problem, so it is desirable to continue to lessen harmful exhaust emissions. Improving fuel economy is important, particularly in achieving the goal of reducing the reliance on fossil fuels. Thus, it would be desirable to provide additional improvements in combustion efficiency by developing further improvements in intake port and combustion chamber design.
SUMMARY OF THE INVENTION
A cylinder bead for a four-cycle internal combustion engine with improved intake port and combustion chamber configurations. In the present invention the physical shape of the intake port and combustion chamber directs the flow of the incoming air/fuel mixture in a swirl path, which is directed toward the spark plug. In particular, the intake port has a protruding fin at its terminal opening into the combustion chamber. The fin creates a swirling motion in the incoming gasses and also directs the flow of the gasses toward the spark plug. As a result, a greater percentage of the intake charge is in close proximity to the center of the combustion chamber and the spark plug, and hence combustion occurs faster and more completely.
In a preferred embodiment of the invention, the portion of the cylinder head that forms the upper surface of the combustion chamber, includes a shear ledge that further acts to direct the flow of the incoming gasses toward the sparkplug. The shear ledge acts as a secondary boundary for the gasses that go past the intake port fin, directing that portion of the charge toward the center of the cylinder and closer to the spark plug. By concentrating the intake charge toward the center of the cylinder, the intake charge is ignited more completely and more rapidly. This is because the majority of the fresh intake charge is kept from directly contacting the cylinder wall by the shear ledge working in conjunction with a flat, shallow combustion chamber geometry. The swirl induction increases combustion efficiency, while the chamber geometry of the invention increases combustion speed. As a result, the engine runs more efficiently, has cleaner exhaust emissions, runs at lower temperatures and has increased torque and horsepower.
REFERENCES:
patent: 3933142 (1976-01-01), List et al.
patent: 4421080 (1983-12-01), Kogure et al.
patent: 4606308 (1986-08-01), Furlong
patent: 4686948 (1987-08-01), Smith, Jr. et al.
patent: 5474044 (1995-12-01), Matterazzo et al.
patent: 5558061 (1996-09-01), Suminski
patent: 5598820 (1997-02-01), Sokoloski
patent: 5816210 (1998-10-01), Yamaguchi
patent: 5913554 (1999-06-01), Oda et al.
patent: 5950582 (1999-09-01), Stein
patent: 52-77907 (1977-06-01), None
Davis Gregory G.
Thurm Kenneth R.
Setina Brunda Garred & Brucker
Solis Erick
Stetina Kit M.
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