Patent ID: 6532928
Filing Date: 2003-03-18
Classification: B29C,B29L,F02M,F05C

Abstract:
An intake manifold for a vehicle, comprising a plurality of branch pipes each of which is commonly connected at one end thereof to a surge tank and each of which has such a shape that is bent at substantially 90 degrees as a projected figure on a vertical plane, said branch pipes being arranged in parallel to one another in a horizontal direction, and an engine mounting flange which is connected commonly with the other end of each of said branch pipes, wherein a first joining member made of a synthetic resin is integrally provided with said engine mounting flange to constitute a portion of each of the branch pipes, and a second joining member made of a synthetic resin is provided to constitute remaining portions of the branch pipes, said first and second joining members being welded to each other along a joining line which extends in a loop and has inclined portions disposed substantially half around said branch pipes on the side of said other end of each branch pipe in such a manner that they are inclined with respect to a pressing direction for pressing said joining members against each other at the time of welding, wherein among welding margins set in at least one of said first and second joining members along said joining line before welding, a welding margin in said pressing direction for zones corresponding to said inclined portions is set larger than that in said pressing direction for remaining zones excluding said inclined portions of said joining line.