| 摘要 |
<p>PURPOSE:To enlarge the curvature of intake air flow, and thereby eliminate stagnation in intake air by extending each wall section projecting to a space side within a surge tank from the side wall of the surge tank at its one side so as to be provided, while being inclined upward out of each space between each opening and each of plural intake ports. CONSTITUTION:In a auction system for a four cylinder engine, a surge tank 1 is provided halfway for a suction passage, an intake air introduction hole 1a is opened at one end of the tank in the longer direction, and a plural number of branch suction passages 2a leading intake air to respective cylinders is opened along the longer direction of the surge tank 1. In this case, wall sections 1d, 1e and 1f leading intake air are provided for the lower wall section 1b of the surge tank 1 so as to be vertically erected in order of the intake air introduction hole 1a between the respective open sections 2a first. These wall sections 1d through 1f are parallel with both a lower wall section 1b and the longer direction of the surge tank 1 while being inclined to the intake air introduction hole 1a side extending to the side wall section at its one side in the side opposite to a cylinder head, so that each wall section is formed in such a way that the quantity of projection is made larger as each wall section is moved to the intake air introduction hole side.</p> |
