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:
May. 14, 2002
Filed:
Sep. 13, 2000
Jay M. Larson, Marshall, MI (US);
David F. Berlinger, Clear Lake, IA (US);
James R. Spencer, Kanawha, IA (US);
Xin Nie, Shanghai, CN;
Eaton Corporation, Cleveland, OH (US);
Abstract
An improved process for making an engine poppet valve provides an unfinished poppet valve with an initial diameter (d ) of a valve head and an initial thickness (t ) of an interface between a seat facing groove and a combustion face of the valve prior to seat facing the valve to prevent burn-through during the welding process Coining the valve head after seat facing decreases the initial thickness (t ) of the interface to a selected thickness (t ) and increases the initial diameter (d ) to a final or desired diameter (d ) of the valve head The method of the present invention eliminates any need for removing excess material and allows for hot forming the seat facing material to reduce machining steps.