| 摘要 |
The engine has a cylinder 2 with a piston 10 and direct fuel injection from a plurality of nozzles 14. Within the piston 10 lies a combustion chamber cavity having two regions, the first 11 of which is an equilateral polygon with rounded corners. The ratio between the radii R of the corners and the radius Ro of the circle which can be inscribed in the polygon is in the range of 0.05 to 0.8. The second cavity region 12 lies behind the first, merges into it, and is toroidal. The ratio between the depth D of the first cavity region and the maximum depth H of the second is in the range of 0.3 to 1.2. <IMAGE>
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