| 摘要 |
PURPOSE:To raise the combustibility at a low speed range of an engine, by setting routes for swirl generation, each of which connects a communicating part for individual intake routes and a near part to an intake valve of each cylinder, with each other respectively, and making frequency of vibration of the normal mode of these routes for swirl generation, coincide with intake frequency at the low speed range of the engine. CONSTITUTION:An intake port 4 of each of cylinders is communicated to a surge tank 10 set at the lower stream side of a throttle body 9 formed with a throttle valve 8, through each of intake routes 7. Then, these intake routes 7 are communicated with each other, by a volume chamber 11 used as a communicating part. This volume chamber 11 and each of the intake routes 7 are communicated or cut by a control valve 13, which is rotatably supported by a same rotary shaft 12 and opened/closed in an integrated one body, according to the operating condition of an engine. In this case, a swirl route 14 adapted to connect the volume chamber 11 and the intake port part 4 of each of the cylinders, which is near to an intake valve 3, with each other, is formed individually at every cylinder. Then, frequency of vibration of the normal mode of this swirl route 14 is made to coincide with intake frequency at the low speed range of the engine.
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