| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an intake system duct for vehicular engine which dispenses with manual fitting of reinforcing members to a duct main body for preventing deformation under negative pressure, and is easily manufactured. SOLUTION: This type of intake duct 1 is composed of a duct main body 11 prepared by blow-molding olefin-derived thermoplastic elastomer, and ring-like reinforcing members 21 each made of hard polypropylene. The reinforcing members 21 are previously inserted onto an inner peripheral surface of a blow- molding die. At the time of blow-molding, the members 21 are closely fitted to bellows 12 of the duct main body 11, and integrated therewith.</p> |
