US 2003/0188709 A1 · Cylinder head for use on a spark-ignition internal combustion engine and such spark-ignition internal combustion engine

Abstract

A cylinder head and a four-stroke and two-valve spark-ignition internal combustion engine spark-ignition internal combustion engine are provided which allows for enhancing the output and the rotational speed of the engine by increasing the flame propagation rate of the burning air-fuel mixture. As the piston 4 moves up toward the top dead center, the air-fuel mixture within the squish area 14 is inducted along the squish guide groove 15 toward the ignition electrode 7a of the ignition plug 7 and is then ignited by the ignition electrode 7a when the piston 4 approaches the top dead center. When the mixture is ignited by the ignition electrode 7a, there is a flow of the air-fuel mixture around the ignition electrode 7a (the ignition plug aperture 12) inducted by the squish guide groove 15 so as to move toward the center of the combustion chamber, so that the flame propagation rate within the combustion chamber may be enhanced as the ignition is effected on such moving air-fuel mixture.

Claims2

Dependent claims

A cylinder head for use on a four-stroke and two-valve type spark-ignition internal combustion engine, said cylinder head being adapted to be joined at mating surfaces to a cylinder having a piston mounted therein, said cylinder head including:

a generally planar squish surface opposing the outer peripheral portion of the top surface of said piston;
a combustion chamber recess formed in the wall of said cylinder head adjacent said squish surface and defining together with said piston top surface a combustion chamber;
a set of intake port and exhaust port formed open through the wall of the combustion chamber recess either at the apex thereof or on the lateral side of the combustion chamber recess opposite from said squish surface;
an ignition plug aperture formed open through the wall of the combustion chamber recess at a location closer to said squish surface relative to said intake port and exhaust port and adapted to receive an ignition plug extending therethrough into said combustion chamber;
and
a squish guide groove formed by notching into the wall of the combustion chamber recess so as to extend from the side of said ignition plug aperture to a location of said squish surface adjacent the inner wall of said cylinder.

3 more elements

Dependencies are inferred from the claim text.

Cylinder head for use on a spark-ignition internal combustion engine and such spark-ignition internal combustion engine

Life of this patent

Cylinder head for use on a spark-ignition internal combustion engine and such spark-ignition internal combustion engine

Life of this patent

Abstract

Claims2