| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the deformation of a resin duct and to control an air flow rate with high accuracy by a method wherein a reinforcement member such as a metal pipe or the like is installed at either the upstream side of the downstream side of the resin duct at which a sensor for the measurement of an air flow rate is installed. SOLUTION: A sensor 2, for the measurement of an intake air amount, is installed at an air passage body 1 in an intake-system duct which constitutes the intake air passage of an internal-combustion engine. The air passage body 1 is connected to, e.g. a rubber hose by a hose ring or the like, a metal pipe 5 is installed at the inside of a tightening part so as to prevent the strain deformation due the heat or the like of an engine room in the cross-sectional shape of the air-passage body 1 made of a resin such as polypropylene or the like, and the occurrence of the measuring error of a sensor 2 for the measurement of a flow rate is suppressed. The metal pipe 5 has a structure which can be molded integrally with the air passage body 1 or can be removed. Instead of the metal pipe 5, a metal member of a cross-shaped structure may be used. The duct can be constituted integrally with an air-cleaner clean side case.</p> |
