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:
Jul. 10, 2001
Filed:
Aug. 22, 2000
James A. Duggan, Temperance, MI (US);
Spicer Driveshaft, Inc., Holland, OH (US);
Abstract
A method for forming a one-piece steering shaft member, such as an externally splined male steering shaft member (or yoke shaft) or an internally splined female steering shaft member (or slip yoke) is disclosed. A hollow cylindrical tube is initially provided which is preferably formed from a blank of a metallic material, such as aluminum, having an elongation factor of at least fifteen percent. It is desirable that the tube have a uniform wall thickness and define an outer diameter which is substantially uniform along the length thereof. The outer diameter of one end of the tube is reduced from its original diameter while the outer diameter of the opposite end is maintained at its original diameter. A splined surface is formed in the reduced diameter end portion of the tube. The splined surface is formed on the external surface of the yoke shaft and on the internal surface of the slip yoke. A yoke member is then formed in the opposite end of the tube. In one embodiment, the opposite end of the tube is first deformed so as to provide a generally hollow rectangular cross sectional shape. Generally U-shaped portions of material are removed from two of the opposed sides of the hollow rectangular end of the tube to form a pair of opposed yoke ears adapted for use in a universal joint. In a second embodiment, the opposite end is maintained in its original hollow cylindrical shape and is machined to form the opposed yoke arms. In both embodiments, a bore is formed through each of the yoke ears.