| 摘要 |
PURPOSE:To obtain good combustion having high air utilization rate along the whole area of a main combustion chamber by providing large cavity portions on both that sides and side cavity portions on both this sides of a dispersing table protruded near a nozzle hole. CONSTITUTION:A dispersing table 13 is protruded to be positioned on the center line (l) of a jet stream and near a nozzle hole 6 on the top surface 8 of a piston 3, and a slope portion 13A descending toward that side of the jet nozzle is formed on the top surface of the dispersing table 13. Roughly circular large cavity portions 12 communicated with each other are provided on both that side of the dispersing table 13. Since cavity portions 14 communicated with each other are provided on both this sides of the dispersing table 13. A part of the jet stream from the nozzle 6 is branched and spreaded from this die of the dispersing table 13 to the side cavity portions 14 to quicken the initial combustion rate, and further, a swirl flow is generated in a jet stream getting over the dispersing table 13 and flowing along the slant portion 13A in the large cavity portion 12 weight the lowering the speed thereof. Consequently, mixture of fuel with air can be accelerated moreover.
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