| 摘要 |
A spark ignition reciprocatory internal combustion engine with dual induction system is provided in which at low and intermediate loads when only a primary throttle valve within a primary induction system opens, a primary intake port passage within a cylinder head will direct fluid charge into a combustion chamber in a cylinder to swirl therein as a primary intake valve opens, while, at high loads when a secondary throttle valve within a secondary induction system opens also, a secondary intake port passage within the cylinder head will direct fluid charge into the combustion chamber in the cylinder in such a direction as to impede and reduce the swirling motion of the fluid charge from the primary intake port passage as a secondary intake valve opens, thereby to maintain the volumetric efficiency of the engine at a sufficiently high level. The secondary intake valve is operated to open in synchronization with the opening of the primary intake valve. The entire combustion chamber is formed by the clearance volume between the upper surface of a piston and the lower surface of the cylinder head and by a cavity formed in the cylinder head.
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