Patent ID: 8033019
Filing Date: 2011-10-11
Classification: F02M,Y10T

Abstract:
1. An injection mold for forming a first lower shell of a lower intake manifold for an internal combustion engine having first and second cylinder banks, the lower intake manifold having first and second banks of runners and having a seal groove surrounding each of the runners in a mating face of the lower intake manifold to the engine head, the seal grooves having first and second sidewalls extending over a portion of their length in a direction parallel to a longitudinal axis of the engine, the first bank of runners having axes contained in a first plane and the second bank of runners having axes contained in a second plane, the injection mold comprising first and second molding elements, wherein each of said first and second molding elements defines a respective portion of each of said runners of said first lower shell, wherein said first and second molding elements meet within said runners along a plane formed at a first angle to said first plane of said runners, and wherein said first plane of said runners forms a second angle with a vertical plane of symmetry through said engine, and wherein after injection of thermoplastic material to form said first lower shell said second molding element is pulled from said first molding element in a direction contained within said second angle but not coincident with said vertical plane of symmetry.