| 摘要 |
An elongated, rod-like rack for use in an automotive-type steering gear assembly and like mechanisms, is formed of an elongated extruded tube divided lengthwise into a substantially solid rack portion and a substantially hollow, link portion. Transversely extending teeth are broached on the rack portion for engagement with a drive pinion means and the like for transmitting power through the rack. The rack is formed by positioning a tubular blank within an open ended extrusion die having an extrusion throat and pushing the tubular blank through the throat for extruding the material longitudinally and collapsing radially inwardly to form a substantially solid, elongated rack portion continuing the pushing the blank with the mandrel within the die throat to extrude a thin wall length, which forms the hollow, integral link part of the rack. The trailing end may be terminated in an inwardly extending, thick wall portion suitable for forming threads thereon.
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