Combustion chamber for an internal combustion engine of direct injection type
AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorsKunihiko Komiyama, Seikichi Kanai, Masaru Okada
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Abstract
A combustion chamber for an internal combustion engine of the direct injection type formed by a cylinder head, a cylinder liner and a piston head, the piston head having formed therein a cavity in which the air swirl can be produced by known means. A fuel injection nozzle is disposed substantially in the central part of said cavity for injecting jets of fuel radially against the cavity wall. Said cavity comprises an equilateral polygonal cavity formed in the upper part of said piston head and a toroidal cavity formed continuously to said polygonal cavity in the lower part of said piston head.
Claims7
In an internal combustion engine of the direct injection type including combustion chambers each defined by a cylinder head, a cylinder liner, and a piston head having a wall defining a cavity therein, means for producing air swirl in said cavity and fuel injection means each having a plurality of fuel injection nozzles, said fuel injection means being mounted substantially at the central part of said cavity, said nozzles being arranged to inject jets of fuel into said cavity radially against said cavity wall, the improvement wherein said cavity wall is constructed to define a generally equilateral polygonal cavity formed in the upper part thereof and a generally toroidal cavity formed in the lower part thereof, the ratio of the depth of said equilateral polygonal cavity to that of toroidal cavity being about 0.3 to about 1.2.
Dependencies are inferred from the claim text.