| 摘要 |
PURPOSE:To produce strong swirl under a high volumetric efficiency, by selecting the connecting angle of an inlet portion and an outer portion of a swirl generating section at such an angle that main flow of intake air carried from the inlet portion to said outer portion of the swirl generating section is introduced between the peripheral surface of said outer portion and the peripheral surface of a valve shaft. CONSTITUTION:The axis of a cylindrical surface constituting the peripheral surface of an outer portion of a swirl generating section 16 is displaced toward the side of the peripheral surface of said outer portion 17 from the axis of an intake port 12, and the eccenticity is set at a value within the range of 2-50% of the diameter of the intake port 12. Further, the connecting angle of said outer portion 17 and an inlet portion 19 is selected at such an angle that main flow of intake air carried from the inlet portion 19 to the outer portion 17 is introduced between the peripheral surface of the outer portion 17 and that of a valve shaft 14. On the other hand, the distance from the axis of the intake port 12 to the center line of the inlet port 19 is selected to be within the range of 20-60% of the diameter of the intake port 12. Further, the inlet portion 19 is shaped to converge toward its top, and the minimum width of the inlet portion 19 is set at a value within the range of 25-85% of the diameter of the intake port 12. |
