Daimler Ag

Wolfgang Rehm

Karl Weisskopf

Timotheus Kaiser

Hermann Pfeifer

Tilmann Haug

A cooling duct piston () for combustion engines. The cooling duct piston has a piston basic body () that is connected to a lining part (), which is facing an assigned combustion chamber. Here, the lining part () completely forms the piston surface () of the cooling duct piston () that faces the combustion chamber. An encircling depression () is provided in the surface of the piston basic body () facing the combustion chamber. The lining part () provides a permanent connection at least with the surface of the piston basic body () facing the combustion chamber, and thus bridges the encircling depression (), such that the encircling depression (), with the lining part () that bridges it, forms a cooling duct ().

Cooling duct piston and method for producing the same

A semifinished product blank, suitable for the production of a steel piston () for internal combustion engines having cylinder crankcases made of light metal alloys. Such a steel piston () has at least one upper piston part () which has a combustion recess () and an annular wall (), and a lower piston part () which has a piston skirt () and a connecting rod bearing (). The semifinished product blank is made of an austenitic steel, that is stabilized with Ni, Mn and N and that has a thermal expansion coefficient in a range of 16 to 21&#xd7;10K. Also disclosed is a steel piston, which at least has a piston skirt () made of an austenitic steel that is stabilzed with Ni, Mn, N. The piston skirt () has a thermal expansion coefficient in a range of 16 to 21&#xd7;10K.

Steel piston for internal combustion engines

The invention relates to a steel piston for internal combustion engines, comprising at least one piston upper part () provided with a combustion cavity () and an annular wall (), and a piston lower part () provided with a connecting rod bearing (). The steel piston is cast as a single component from a reduced-density steel alloy or a special steel alloy in the same material by means of a low-pressure casting method.

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Ulm, Germany

Wolfgang Rehm