COMBUSTION CHAMBER STRUCTURE FOR DIRECT INJECTION ENGINE
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United States of America Patent
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Feb 19, 2015
app pub date -
Apr 3, 2013
filing date -
Apr 10, 2012
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Abstract
A combustion chamber structure of a direct injection engine includes a cavity recessed in a center of a top of a piston into which fuel is injected from an injector disposed above the piston. The cavity includes a curved section on a lower part of a side wall of the cavity and which has a vertical cross-sectional shape defined by an arc protruding outward in a radial direction of the piston. The cavity also includes a bottom wall straight line section on a bottom wall. The cavity also includes a bottom wall transition curved section between the bottom wall straight line section and the curved section which has a vertical cross-sectional shape defined by a transition curve having a curvature radius continuously changing from a curvature radius of the arc to an infinite value.
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