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:
Feb. 16, 1993
Filed:
Jan. 06, 1992
Joseph A Kovach, Aurora, OH (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
Processes are provided that in one embodiment provide scribe or scratch marks (16) in the outer surface of an internal combustion engine valve stem (12) that are oriented at an acute angle (alpha) to the central longitudinal axis ('C') of valve stem (12) to promote stress planes that reduce the amount of stress arising in valve stem (12) from bending and reciprocating tensile forces 'F' acting thereupon during operation of the engine. In another embodiment two sets of such scribe or scratch marks (26 and (28) are produced that intersect each other to provide a cross-hatch pattern and in yet another embodiment circumferentially spaced scribe or scratch marks (40) are produced in the outer surface of valve stem (36) that are substanially parallel to axis 'C' and effective to reduce surface area engagable with a surrounding surface (60) of an insert (58) through which valve stem recirprocates during operation of the engine and to enable maintenance of an elastohydrodynamic lubrication film therebetween.