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, 2012
Filed:
Aug. 23, 2008
Jochen Kortas, Murr, DE;
Timo Estrum, Stuttgart, DE;
Dieter Messmer, Remseck, DE;
MAHLE International GmbH, Stuttgart, DE;
Abstract
The invention relates to a two-piece piston () for an internal combustion engine, comprising a piston base body () and a ring element (), which is soldered to the piston base body () by an upper solder connection () having the length b, which is disposed on the radial inside of a piston crown () formed at least partially by the ring element (), and by a lower solder connection () having the length c, which is disposed radially outside on the top of a center part (). In order to improve the strength of the solder connections () and () due to pressure and temperature-related deformations of the upper piston part, the ring element () has a peripheral, upper, thinner wall region () in the region of the piston crown () radially outside the upper solder connection () and further a peripheral, lower, thinner wall region () between the ring section () and the lower solder connection (), wherein the thickness a and b of the thinner wall regions () and () has a lower value than the length b and c of the solder connections () and ().