Ignition system for multi-valve engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMasaaki Yoshikawa
Life of this patent
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Abstract
An ignition system for a multi-valve internal combustion engine wherein the valves all reciprocate about acute angles to a plane containing the cylinder bore axis and wherein a spark plug is positioned in a generally parallel extending direction to the plane and is offset slightly toward the side of the plane containing the most valves. A spark coil is affixed to the terminal end of the spark plug and is itself offset to the other side of the plane to nest between the two poppet valves and provide a compact, low volume combustion chamber and a compact, low height engine arrangement.
Claims18
An ignition system for a multi-valve engine comprised of a cylinder head forming a combustion chamber, a plurality of poppet valves supported for reciprocation within said cylinder head, said valves being positioned at not greater than acute angles to a plane containing the axis of an associated cylinder bore with more of the poppet valves lying on one side of said plane than on the other side of the plane, a spark plug supported within said cylinder head with a spark plug gap position substantially on the center of said combustion chamber, and a spark coil mounted to the terminal end of said spark plug for firing said spark plug, said spark coil having a longitudinal axis which longitudinal axis is offset to one side of said spark plug and in an area between at least two of said valves.
Dependencies are inferred from the claim text.