| 摘要 |
PURPOSE:To prevent fuel from adhering to the wall surface of a combustion chamber, by providing a swirl injection valve directed to a recess formed in a combustion chamber in which intake-air flows and swirls, with a relation having a predetermined numerical value, in such a position that the center of atomization by the injection valve does not cross the center axis of the recess but is skewed. CONSTITUTION:A substantially spherical recess 3 is formed in the top surface of a piston 2 with being made eccentric from the center axis of the piston 2, and a swirl injection valve 10 is fitted in the cylinder head 4 in such a position that its jet port 11 directs the opening of the recess 3 and as well the center axis of the injection is skewed without crossing the axis of the recess 3. In this arrangement, the maximum distance D between the opposing side surfaces is set in a range from 25-65mm.. Further, estimating a cross-sectioned plane which includes the position of the maximum distance D and the other plane which perpendicularly crosses the first mentioned cross-sectioned plane and includes the center of the recess 3 in the above-mentioned cross-sectioned plane, the distance beta between the other plane and the center axis of atomization is set in a range from 6-20mm.. Further, the angle theta made between the center axis of the atomization and the above-mentioned one cross-sectioned plane is set in a range from 40-70 deg..
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