| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively generate a circulating vortex current of a swirl, a tumble or the like with a simple and inexpensive structure by comprising a port for introducing the supercharged pressure by a supercharger to a combustion chamber of an engine, and another port for introducing the atmospheric air from a throttle valve by the intake negative pressure to the combustion chamber. SOLUTION: When an engine is started and a piston is in an intake stroke, a negative pressure is applied to a combustion chamber 2, and the air corresponding to the opening and closing amount of a throttle valve 5 is introduced into the combustion chamber 2 through one of ports 4 forming an intake port 12. Simultaneously the supercharged pressure is introduced into the combustion chamber 2 from a supercharger 1 through the other port 3. On this occasion, the pressure of the air introduced from the port 3 is higher than that of the air introduced from the port 4, and a large amount of the air is introduced from the port 3, so that the circulating vortex current of the air can be effectively generated in the combustion chamber 2 by this difference. Whereby the circulating vortex current can be obtained in the whole rotational frequency zone of the engine without curving the ports 3, 4 into the complex shape.</p> |
