Mahle International Gmbh

Timo Estrum

Wolfgang Issler

Dieter Messmer

Roland Lochmann

Jochen Kortas

Peter Heidrich

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 ().

Two-part piston for an internal combustion engine

The invention relates to a piston () for an internal combustion engine, comprising a piston head () with at least one piston crown () which is exposed to at least one jet of combustion gases, and a piston shaft (), the piston head () and the piston shaft () being configured as interconnected individual components including a peripheral outer cooling channel (). The invention is characterized in that an annular partition wall () is provided in the cooling channel () in parallel to the piston crown () and has one or more nozzle-type openings () that are arranged in such a manner that their respective outlet jet is directed against the underside () of the piston crown ().

Piston for internal combustion engine

The invention relates to a cooling duct piston for an internal combustion engine comprising heat pipes. In order to improve dissipation of heat from the thermally loaded piston areas while preventing thermal tensions, liquid-filled heat pipes that are provided with an evaporator end and a condenser end are disposed in bores of the cooling duct which are oriented towards the bottom of the piston. The heat pipes are arranged such that the evaporator ends terminate at the end of the bores which faces the piston bottom while the condenser ends terminate in the closed cooling duct.

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Stuttgart, Germany

Timo Estrum