| 摘要 |
In an intake air rate controlling device including a throttle body 1, forming an air-intake passage 2, and a plate-like throttle valve 4, rotatably supported by the throttle body 1 through a throttle shaft, wherein an intake air rate supplied to an internal combustion engine is controlled by a rotation of the throttle valve 4, and air-flow controlling means 20 is located on an upper stream side or a lower stream side of the throttle valve 4 for suppressing a variation of a torque, effecting on the throttle valve 4 by a hydrodynamic force generated by an intake air, whereby excellent durability, excellent reliability, and high performances are obtainable.
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