Mahle Gmbh

Eberhard Bubeck

Emil Ripberger

The invention relates to a method for producing a cooled ring carrier () for an aluminium piston pertaining to an internal combustion engine and produced according to a casting method, comprising a cooling channel () which is embodied on the rear () of the ring carrier as a downwardly open turned groove () According to the invention, salt granules are pressed into the turned groove () at a pressure of between 100 and 300 N/mm, in such a way that a salt core () is formed in the turned groove () The composite consisting of the ring carrier and the salt core is then immersed in an alfin bath.

Method for producing a cooled ring carrier

Piston-cylinder assembly

A piston, particularly for internal combustion engines, of which the bearing surfaces with which the piston comes into contact with the engine cylinder bore lie on a generated surface which runs asymmetrically to the axis of an engine cylinder accommodating the piston without clearance in the longitudinal direction of the piston and/or in the circumferential direction.

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Fellbach, Germany

Eberhard Bubeck