Air-cooled, four-stroke aviation engine
AssigneeAvco Corporation
InventorsPatrick Henry Baer, Michael Glynn Glucksman
Life of this patent
Estimating the term…
Abstract
An improved air-cooled aviation engine includes a compact combustion chamber having an intake valve opening, an exhaust valve opening, and a generally elliptical shape. The elliptical shape has a major axis and a minor axis, with the major axis intersecting both the intake valve opening and the exhaust valve opening. In some examples, the major axis is the same length or shorter than a diameter of a cylinder bore of the engine, and the minor axis is smaller than the major axis. Combustion is thus constrained to a smaller area than that of the cylinder bore.
Claims15
An air-cooled aviation engine, comprising:
- a cylinder head having an intake valve opening, an exhaust valve opening, a plurality of spark plugs, and an interior surface;
- a cylinder bore having a cross-sectional area and containing a piston configured to move reciprocally within the cylinder bore;
- and
- a combustion chamber having an upper region defined by the interior surface of the cylinder head and a lower region defined by the piston when the piston is in an uppermost position within the cylinder bore,
- wherein the combustion chamber has an elliptical shape that extends over a cross-sectional area smaller than the cross-sectional area of the cylinder bore, the elliptical shape having a major axis that intersects the intake valve opening and the exhaust valve opening.
An air-cooled aviation engine, comprising multiple cylinders, each cylinder including:
- a cylinder head having an intake valve opening, an exhaust valve opening, a plurality of spark plugs, and an interior surface;
- a cylinder bore having a cross-sectional area and containing a piston configured to move reciprocally within the cylinder bore;
- and
- a combustion chamber having an upper region defined by the interior surface of the cylinder head and a lower region defined by the piston when the piston is in an uppermost position within the cylinder bore,
- wherein the combustion chamber has an elliptical shape that extends over a cross-sectional area smaller than the cross-sectional area of the cylinder bore, the elliptical shape having a major axis that intersects the intake valve opening and the exhaust valve opening.
Dependencies are inferred from the claim text.