| 摘要 |
<p>An internal combustion engine inlet manifold includes two parts of a housing 11 formed by welding a first plastics component 16 to a second plastics component 17 at a pair of abutting non-planar joint faces (27, 28) indicated by a joint line 18, by vibrating one component relative to the other. The housing 11 includes four inlet tracts (13, Fig.2) each including a curved tract portion defined by a curved duct portion 15. One component 17 is on the inside of the curve and the other component 16 is on the outside, no part of the joint face being inclined at an angle greater than 60 degrees to a plane perpendicular to the direction of a clamping force used in the friction welding. The joint faces may be provided with respective peripheral lands 37, 39 and 38, 41; and a tongue 29 and abutment surface 33, such that there is an initial predetermined gap between the lands which closes when the vibrations and clamping force are applied, the vibrations being ceased when the gap is eliminated. <IMAGE></p> |
