Patent ID: 6826945
Filing Date: 2004-12-07
Classification: B21K,B62D,F16H,Y10T

Abstract:
A method for the production of a gear rack for a rack-and-pinion steering gear for automobiles comprising the steps of:producing a blank for the gear rack having a) at least in its toothed area, a form deviating from a circular cylinder, b) in the toothed section of the gear rack, at least two flattening areas converging on each other and being essentially symmetrically arranged, and c) a cross-sectional surface which is smaller than a surface of an envelope encompassing a contour of the finished gear rack in the toothed section and determined by dimensions of adjacent parts of the rack-and-pinion steering gear; and tumble forging the gear rack from the blank so that after tumble-forging the gear rack in the toothed section thereof outside the toothed area has a concave longitudinal profile and such that during tumble-forging the longitudinal profile supports the tumbling-torques.