Metal deforming – Process – With attenuation – thickening – elongating or shortening of...
Patent
1983-06-15
1985-05-14
Bray, W. D.
Metal deforming
Process
With attenuation, thickening, elongating or shortening of...
72 57, 72412, B21D 3100
Patent
active
045164223
ABSTRACT:
In a method of manufacturing a rack for a variable ratio rack and pinion steering gear, having a preforming process for preparing a rack blank having a plurality of teeth which are formed to a shape corresponding approximately to the shape desired in the finished rack and a finishing process for converting the teeth to the finished shape by cold forming in a die having a shape which is the exact counterpart of the finished shape, the preformed rack teeth are shaped to have top lands which are level with those in the finished shape and bottom lands that are deeper than those of same. The rack teeth in the preformed shape are all wider at the top areas than in the finished shape, and the ratio of the widths at the root areas of the rack teeth in the preformed shape to those in the finished shape varies in proportion to the variation of the steering ratio such that a rack tooth for a higher steering ratio is given the above-mentioned ratio that is larger.
REFERENCES:
patent: 3370450 (1968-02-01), Scheucher
patent: 4051708 (1977-10-01), Beane et al.
patent: 4193722 (1980-03-01), Bishop
Higuchi Megumu
Morikawa Kunihiko
Yanai Tokiyoshi
Bray W. D.
Nissan Motor Co,. Ltd.
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