Pipe connecting method for e.g. engine manifold

摘要

One pipe (1) has an enlarged terminal collar (2), its internal diameter less than the external diameter of the spigot (3) facing it. Near the end of the collar, the internal diameter just exceeds that of the spigot. The difference (d) is indicated at the chamfer. The spigot is thrust fully into the collar. Heating the collar allows it to shrink firmly down onto the spigot. An Independent claim is included for the pipe joint so made. The first pipe section is blown, the second is a flange section formed by injection molding and has minimal thermal expansion coefficient. On the second section (3) there are hose-tail ring-barb formations (4). The first pipe section is a component of the air induction manifold of an internal combustion engine. The second is a flange section connecting to the cylinder head.