| 摘要 |
PURPOSE: To aim at the fruition of good combustibility in almost all the driving state of an engine by installing an antechamber member provided with a sub combustion chamber on the inside so as to be turnable around an axis to be contained in a plane almost orthogonal with a cylinder axis. CONSTITUTION: In time of a low speed of rotation, making an antechamber member 20 turn as far as an angleθb around an axis 0-0, and angle to be made between the center of a nozzle hole 28 and a piston top face is turned toα1 and thereby it is decreased more than in time of a high speed of rotation, and thus the nozzle hole 28 points to an inward part in the radial direction of a combustion chamber 16. At this time, since an end edge 30' of an opening 30 of a cylinder 18 interferes with an opening of an outlet of the nozzle hole 28, a passage area of combustion gas flowing into a main combustion chamber 16 from a sub combustion chamber 22 is decreased in proportion to the turning angleθb of the antechamber member 20. With this constitution, a speed of the combustion gas flowing into the main combustion chamber 16 from the sub combustion chamber 22 is increased, and also at this time, the center line of a jet is the same in substance, so it will not partially flow into the main combustion chamber 16 at all and, and also the diffusion range of a combustion gas jet in a cylinder 14 becomes widened, and this gas jet is diffusedly burned in an effectively manner.
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