| 摘要 |
<p>A plastic stabilized composite camshaft and method. In one version, a hollow polished tube (75) is positioned within appropriately aligned and fixtured annular cam elements (73) having interior protrusions (79) that increase in size toward the tube axis and a flowable, hardenable material is injected through the tube (75) to fill the voids between the tube (75) and the cam elements (73) for securing the cam elements (73) to the tube (75). The protrusions (79) enhance the grip of the plastic with shrinkage. The surfaces of the tube (75) and of the cam elements (73) are preground to finish dimensions. In another version, the annular cam elements are originally circular and formed into their final configuration in the mold by appropriately configured side acting shuttles. In a preferred embodiment for automotive applications, the shaft and cam elements have nesting configurations that form a continuous space therebetween such that the hardened material compressionally resists torsional forces between the shaft and cam elements. A method of injection molding without substantially stressing the freely supported shaft is also disclosed.</p> |
