Combustion chamber of a direct fuel injection type diesel engine
AssigneeIsuzu Motors Limited
InventorsMotoyasu Kimbara, Hiroshi Shimomukai
Life of this patent
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Abstract
A combustion chamber of a direct fuel injection type diesel engine has a cavity at the crown of a piston, within which a swirl occurs and onto which fuel is injected from a multi-orifice fuel injection nozzle toward a inner side wall of the cavity. The cavity is regular polygonal in horizontal cross-section. The inner side wall is so inclined inwardly of the cavity as to provide a restriction at the opening of the cavity. The inner side wall and the injection nozzle are so arranged that the fuel jet is distributed to the downstream side of the swirl after being impinged the inner side wall, whereby the distribution of the injected fuel is improved to provide ideal mixture in the cavity, resulting in reduced amount of pollutant emissions.
Claims2
In a combustion chamber of a direct fuel injection type diesel engine, wherein a cavity is formed at the crown of a piston, means are provided for generating a fuel mixture swirl in the cavity, and a multi orifice fuel injection nozzle is centered with respect to the cavity;
- the improvement characterized in that:
- the cavity is defined by a bottom wall and an inner side wall means, said side wall means comprising a number of flat wall and circular wall portions and being of polygonal shape in perpendicular section to the vertical axis of the piston throughout the vertical extent of said cavity, said fuel injection nozzle has a number of orifices corresponding to the number of flat wall portions, and the cavity inner side wall means is inclined inwardly and upwardly relative to the piston axis, and the nozzle openings being such that the multiple injection fuel jets are directed obliquely toward respectively side wall flat portions in the horizontal plane to cause the fuel mixture to be distributed towards the downstream side of said swirl after impinging said inner side wall means.
Dependencies are inferred from the claim text.