| 摘要 |
PURPOSE:To secure a proper suction flow by tilting a control valve, having a notch and opening or closing a suction passage by rotation of a valve stem, in a specific direction, while setting up a central position of the notch in a part corresponding to a specific circular arc in the control valve. CONSTITUTION:A suction port 3 formed in a cylinder head 1 is opened or closed by a swirl control valve 23, having a notch 21, with the rotation of a valve stem 25. In this case, the control valve 23 is tilted forward as far as the specified angle to the side of an intake valve to a perpendicular with a center line 28 of a suction passage 14 at time of its full close. A first circular arc l1 is set to a quadrisection part 29 at the cylinder outer circumferential side, while a second circular arc l3 is set up to an intersection point C equal to length of the first circular arc l1 along the circumference of the control valve 23 from an intersection point A distant from a cylinder center line 18 perpendicular with the cylinder bank direction. A central position of the notch 21 is set onto an areal part of the control valve 23 corresponding to the second circular arc l3.
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