Patent ID: 8302271
Filing Date: 2012-11-06
Classification: B23D,F16C,Y10T

Abstract:
1. An apparatus for manufacturing a connecting rod by integrally forming a connecting rod having a larger end and a smaller end, setting a joint hole in the larger end over a pair of spreaders, and spreading the spreaders apart from each other to crack the larger end into a cap part and a rod part, the apparatus comprising: a fixed stage fixedly mounted on a base; a movable stage disposed in facing relation to said fixed stage and horizontally movable toward and away from said fixed stage; a first spreader mounted on said fixed stage; a second spreader mounted on said movable stage for displacement in unison with said movable stage; and a loading mechanism for applying a fracture load to move said spreaders away from each other to crack said larger end; wherein said larger end has a pair of fastening holes defined therein on respective horizontal sides of said larger end substantially parallel to the axis of said rod part, for inserting therein respective fasteners to fasten said cap part and said rod part to each other, said fastening holes having respective central axes displaced off the centers of fractured surfaces of said larger end; and when said spreaders engage in said joint hole to crack said larger end, the area of contact between said second spreader on said movable stage and an inner wall surface of said joint hole is greater than the area of contact between said first spreader on said fixed stage and an inner wall surface of said joint hole.