| 摘要 |
To provide an improved swirl forming device in a combustion engine, which is effective to promote a vigorous and massive swirling motion of the charge mixture within the combustion chamber, the swirl forming device includes an auxiliary passage ( 24 ) for introducing an auxiliary gas, which may be either air or a charge mixture, into the combustion chamber ( 9 ) from a location immediately upstream of the intake port ( 70 ) that is selectively opened and closed by the intake valve ( 10 ). This auxiliary passage ( 24 ) has an open end ( 25 ) positioned adjacent the exhaust port ( 80 ), such that when viewed from top in a direction conforming to the longitudinal axis (CC) of the cylinder bore ( 3 ), the auxiliary gas is introduced in a direction different from the direction (N) normal to the inner peripheral surface ( 3 a) of the cylinder bore ( 3 ) to thereby form a swirl (S) along the inner peripheral surface ( 3 a) of the cylinder bore ( 3 ).
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