| 摘要 |
PROBLEM TO BE SOLVED: To provide a premix compression ignition engine for stabilizing combustion. SOLUTION: A piston top surface 6a is provided with a combustion chamber 20 having a first recess part 21 recessed in a spherical surface shape, and a second recess part 22 formed in a central part of the first recess part 21 and recessed in a spherical surface shape. The combustion chamber 20 is set in a shape of setting the ratio of a diameter D of an opening 24 to the depth H of the deepest part 23 to 5 to 13, and setting the ratio of the area of a squish area 25 to the area of the piston top surface 6a to 0.25 to 0.45. Clearance between the squish area 25 and an under surface 5a of a cylinder head 5 is set so as to become 2 to 3 mm. COPYRIGHT: (C)2006,JPO&NCIPI
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