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. 24, 2001
Filed:
Jul. 20, 1999
David L. Bonesteel, Richland, MI (US);
Leslie L. Ecklund, Battle Creek, MI (US);
Michael J. Froehlich, Bellevue, MI (US);
Michael L. Killian, Troy, MI (US);
Philip M. Kline, Tekonsha, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A hollow poppet valve (,) is disclosed, in which a stem portion (,) includes a flared fillet portion (,), having a wall thickness (T), and a downwardly-extending cylindrical portion (,), having a cylindrical external surface (,). In the main embodiment, the valve includes a cap member (,) defining a seat face (,), and a cylindrical internal surface (,), the internal and external surfaces (,) being closely spaced apart, defining an interface having an axial length (L), and being consumed by a weld (,). Preferably, the length (L) of the weld (,) is equal to at least 1.1 times the thickness (T). The fillet portion (,) defines an internal fillet radius (R,), greater than 0.3 times the thickness (T), and near the radius (R,) is a transition region (TR). The present invention improves fatigue strength of the poppet valve by separating the transition region (TR) from the weld (,) so that there is overlap for no more than a minor portion of the weld.