| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an intake passage of an engine intake system that can improve an output characteristic of an engine with high efficiency by reducing intake resistance by generation restraint of a turbulent flow and a turbulent vortex, and can also attain low cost by simplifying a structure. <P>SOLUTION: The intake passage 1 of the engine intake system is formed by continuing a first intake passage 4 of a throttle body 3 equipped with a throttle valve 2 and a second intake passage 8 of an intake pipe 7 connected to the downstream side of the first intake passage 4. An inner diameter D2 of the first intake passage 4 is set larger than an inner diameter D1 of the second intake passage 8, and a spacer 5 having a third intake passage 6 for mutually continuing the first intake passage 4 and the second intake passage 8, is interposed between the throttle body 3 and the intake pipe 7. The cross-sectional area of the third intake passage 6 is formed in a tapered shape of diametrically contracting toward the second intake passage 8 side from the first intake passage 4 side, and the first intake passage 4 and the third intake passage 6, and the third intake passage 6 and the second intake passage 8 continue without a step height. <P>COPYRIGHT: (C)2013,JPO&INPIT |
