| 摘要 |
PURPOSE:To generate strong swirl by providing an opening and closing valve on a junction of intake air passages of an engine in which two intake valves are provided on one cylinder and by deflecting intake air flow on a cylinder outer peripheral side of a valve stem of an intake valve passing through an auxiliary intake air flow communicating an upper stream portion of the opening and closing valve and one intake port. CONSTITUTION:Two intake valves 6, 6 are provided on one cylinder 1, and an auxiliary intake passage 41 communicating from an opening 41a of an upper stream of an opening and closing valve 14 provided on a junction portion of upper streams of respective intake ports to an opening 41b of one of the intake ports is provided. The auxiliary intake passage 41 is throttled to the lower stream, and intake air flow for swirl to be jet from the opening 41b is flowed to a valve stem 8a of an intake valve 8. An inner edge l of the intake air flow is contacted to an inner face of the valve stem 8a and an inner edge m is directed to an outer periphery of a cylinder, then intake air entering into a combustion chamber is throttled in its inner side on the valve stem unit and deflected to the outer periphery side of the cylinder, and strong swirl can be generated. |
