| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce pressure loss and output noise and sufficiently secure strength affecting noise by optimizing the installation location and shape of ribs for securing reinforcement and dimensional accuracy and straightening air. SOLUTION: In a duct 6, an air flow rate measuring device 7 for measuring intake air flow rate is installed. Inside the device 7, ribs 8 for reinforcement are installed and lowering of compartment noise of an automobile, in particular, is promoted. The reinforcing ribs 8 are constituted in a radiation shape toward the duct 6 in which the air flow rate measuring device 7 is installed and has an effect straightening air sucked into the duct 6. When the installation location/ height of the reinforcing ribs 8 are optimized, straightening of intake air is performed. Thus, pressure loss and output noise which increase at the time of colliding against a difference in level can be reduced. If the air flow rate measuring device 7 installed in the duct 6 at the downstream is adopted, high accuracy of an automobile control is attained.</p> |
