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. 05, 2011
Filed:
Dec. 14, 2006
Alexander Grössle, Pfedelbach, DE;
Thomas Hoch, Stuttgart, DE;
Alexander Grössle, Pfedelbach, DE;
Thomas Hoch, Stuttgart, DE;
MAHLE International GmbH, Stuttgart, DE;
Abstract
The present invention relates to a piston () for an internal combustion engine, having a combustion depression () which is provided in the piston head () and has an encircling undercut (), wherein the encircling depression edge () which connects the undercut () to the piston head () has alternately rounded () and sharp-edged depression edge regions (). It is provided according to the invention that the encircling depression edge () merges along its entire periphery into a planar encircling face () which in turn merges along its entire periphery with a sharp edge into the undercut (). The method according to the invention for producing a piston () of the type is characterized in that, in a first method step, a combustion depression with an encircling undercut and with an encircling depression edge is formed in the piston head () using a lathe tool, and in that, in a second method step, in order to produce the rounded () and sharp-edged depression edge regions (), the lathe tool is moved radially outwards rectilinearly from the central point of the combustion depression by a defined magnitude.