The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2004
Filed:
Dec. 23, 1999
ZF Friedrichshafen, Friedrichshafen, DE;
Abstract
A technique for manufacturing a gear rack ( ) for a rack-and-pinion steering gear for automobiles makes use of a blank ( ) for the gear rack ( ) having at least in the latter's toothed area a form deviating from a circular cylinder. Size and form of the cross-section of the blank ( ) are selected in a manner that the contour of the finished gear rack ( ) in the toothed area ( ) does not project beyond the envelope given by the dimensions of neighboring parts of the rack-and-pinion steering gear. The gear rack ( ) is formed from the blank ( ) by means of tumble-forging. After tumble-forging, the gear rack ( ) in its toothed area ( ) outside the toothed section has a convex or concave longitudinal profile, which serves to support the tumbling torques during tumble-forging.