| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion chamber structure for an internal combustion engine for improving output by securing the amount of intake air and permitting firing advance. SOLUTION: In the structure, a combustion chamber C is formed which is surrounded by a cylinder head lower face, a piston upper face Fp and a cylinder. On the cylinder head lower face in a top-view circular shape, an intake valve 11 and an exhaust valve 12 are provided at one side and at the other side, respectively, across a chord A in a top-view circular shape ranging toward an engine longitudinal direction X. On the piston upper face Fp, a conical tapered portion 16 is formed along the peripheral edge ranging from the peripheral edge toward a piston central direction and a recessed portion 17 is formed at the center. On the tapered portion 16 near the chord A, both an arrangement side portion e1 of the exhaust valve 12 and an arrangement side portion e2 of the intake valve 11, narrower than that, are continuously formed with a level difference. COPYRIGHT: (C)2007,JPO&INPIT
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