Importance

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Abstract

A combustion chamber shape for air-compressing, self-igniting internal combustion engines is designed such that fuel injection jets ejected from a multiport injection valve positioned on the cylinder axis do not come into contact with the walls of the combustion chamber. For this purpose, the piston bottom is conically shaped whereby the slant of the conical surface is selected such that the piston bottom is adapted to the contour of the widening injected fuel jet. The cylinder head bottom is designed as a spherical segment, also with the goal that the fuel injection jet does not come into contact with the combustion chamber walls. The conically designed piston bottom may have radially extending depressions when the combustion chamber is very small in order to achieve high compression ratios. With the depressions it is ensured that despite the small distance between the piston bottom and the cylinder head bottom the injected fuel jet does not come into contact with the combustion chamber walls so that an incomplete combustion is prevented.

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First Claim