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. 10, 2013
Filed:
Apr. 18, 2011
Rainer Scharp, Vaihingen, DE;
Gerhard Berr, Aspach, DE;
Sascha-oliver Boczek, Dielheim, DE;
Reiner Mueller, Rottweil, DE;
Rainer Scharp, Vaihingen, DE;
Gerhard Berr, Aspach, DE;
Sascha-Oliver Boczek, Dielheim, DE;
Reiner Mueller, Rottweil, DE;
MAHLE International GmbH, Stuttgart, DE;
Abstract
A method for the production of a piston () made of steel, for an internal combustion engine, in which the upper piston part () is produced using the forging method, and the lower piston part () is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of semi-hot forming, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.