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:
Sep. 06, 2005
Filed:
Oct. 31, 2002
Zdenka Hora, Kornwestheim, DE;
Thomas Marko Hora, Kornwestheim, DE;
Jens Meintschel, Esslingen, DE;
Martin Schlegl, Rudersberg, DE;
Thomas Stolk, Kirchheim, DE;
Karl-heinz Thiemann, Korb, DE;
Alexander Gaisberg-helfenberg, Beilstein, DE;
Zdenka Hora, Kornwestheim, DE;
Thomas Marko Hora, Kornwestheim, DE;
Jens Meintschel, Esslingen, DE;
Martin Schlegl, Rudersberg, DE;
Thomas Stolk, Kirchheim, DE;
Karl-Heinz Thiemann, Korb, DE;
Alexander Gaisberg-Helfenberg, Beilstein, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
The invention relates to a multi-piece valve for reciprocating piston engines in which the valve stem is connected to the valve head in a manner resistant to both tension and compression. In the area of a center through-opening the valve head has an annular bearing surface for a stem-side flange. In addition, the center opening widens on the combustion chamber-side of the valve head, the head-side end of the valve stem being plastically expanded so that it fills this enlargement, forming a positive interlock. In order to improve the service life of the connection between valve head and valve stem, according to the invention the combustion chamber-side enlargement of the center opening and accordingly also the conformed, end-side expansion of the valve stem are of non-circular design so that a positively interlocking torsionally fixed connection is produced between the valve stem and the valve head.