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:
Apr. 20, 1999
Filed:
Jun. 18, 1996
Rudolf Bauer, Herzogenaurach, DE;
Horst Doppling, Herzogenaurach, DE;
INA Walzlager Schaeffler KG, , DE;
Abstract
A method for making a trunnion for a rocker arm or a finger lever of an internal combustion engine from a piece of rod-shaped ground stock by removal of a peripheral section to produce a flat bearing surface including forming the round stock into a barrel-shaped blank by upsetting, shaping the barrel-shaped blank into a rotationally symmetrical element including a central shoulder having a uniform diameter which is greater than the diameter of the trunnion and removing the peripheral section at any point from the central shoulder by shearing from two sides thereof in an axial direction of the rotationally symmetrical element whereby any cutting plane material from the central shoulder is directed towards a sheared surface whereby the bearing surface is a hardened surface.