| 摘要 |
PURPOSE:To uniformalize combustion in a main combustion chamber, so as to enhance combustion efficiency by approximately equalizing the content volume of both valve recess parts including the content volume of chamber parts to each other through a process of providing a chamfer part connected to at least one periphery of an intake valve recess part and an exhaust valve recess part on the lower surface of a cylinder head. CONSTITUTION:Main combustion chambers 7-1, 7-2 into which jet flow is injected from a nozzle hole 6 opening toward the center of a piston from a sub chamber 5 is symmetrically formed, and an intake valve recess part 2 and an exhaust valve recess part 2 whose shapes are different from each other are formed on the lower surface of a cylinder head, so as to be overlapped on both main combustion chambers 7-1, 7-2. In this case, chamfer parts 2', 4' are formed on at least one peripheries of respective valve recess parts 2, 4, and the content volume of both valve recess parts 2, 4 including the content volume of the chamfer parts 2', 4' are approximately equalized to each other. Thereby, air existing in the main combustion chamber is approximately symmetrically distributed, so as to secure uniform combustion.
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