Mahle International Gmbh

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Mahle Gmbh

Hirschvogel Umformtechnik Gmbh

Volvo Powertrain Corporation

Gerhard Berr

Rainer Scharp

Sascha-Oliver Boczek

Reiner Mueller

Lars Olof Lundin

Magnus Horn

Armin Ihle

Henk Ravenshorst

Lars Lundin

Reiner MÜLLER

Henk Ranvenshorst

A method for producing a piston for an internal combustion engine may include the steps of: producing a first blank corresponding to a piston main body via a deformation process; producing a second blank corresponding to a piston ring part via at least one of a deformation process and a casting process; pre-machining the first blank and the second blank, and finishing a welding surface of the first blank and a welding surface of the second blank via machining; connecting the first blank and the second blank via welding the welding surface of the first blank to the welding surface of the second blank to form a piston body; and performing at least one of a secondary machining process and a finish machining process on the piston body to produce the piston.

Method for producing a piston for an internal combustion engine and piston produced by said method

A method for producing a piston for an internal combustion engine may include the steps of: producing a piston upper part from a first blank via a deformation process; producing a piston lower part from a second blank via at least one of a deformation process and a casting process; connecting the first blank of the piston upper part and the second blank of the piston lower part to form a piston body via a welding process; and performing at least one of a secondary machining process and a finish machining process of the piston body to produce the piston.

A method for producing a piston for an internal combustion engine may include the steps of: producing a piston main body from a first blank via a deformation process; producing a piston ring part from a second blank via at least one of a deformation process and a casting process; pre-machining the first blank and the second blank, and finish machining a welding surface of the first blank and a welding surface of the second blank; connecting the pre-machined first blank and the pre-machined second blank via a welding process to form a piston body; and performing at least one of a secondary machining and a finish machining of the piston body to produce the piston.

A method for the production of a piston made of steel, for an internal combustion engine, in which the upper piston part is produced using the forging method, and the lower piston part is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.

Method for the production of a piston for an internal combustion engine

A method for the production of a piston () made of steel, for an internal combustion engine, in which the upper piston part () is produced using the forging method, and the lower piston part () is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of semi-hot forming, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.

In a multipart cooled piston ( ) for a combustion engine with a piston upper part ( ) of steel comprising a combustion bowl ( ) and a ring wall ( ) with ring belt ( ), and with a piston lower part ( ) comprising a piston skirt ( ), pin bosses ( ) for receiving the piston pin connecting the piston ( ) to the connecting rod, and pin boss supports ( ) connected to the piston skirt ( ), and in a method for manufacture of such a piston ( ), inexpensive manufacture and good form stability are to be achieved in that a cooling channel ( ) formed inside the piston upper part ( ) has forged supporting ribs ( ) in its area extending to the combustion bowl ( ), which each form sections of an all-round ring rib ( ) with a connection surface radially to the longitudinal piston axis (K), in that the piston lower part ( ) has an annular and all-round carrier rib ( ) with a connection surface connected to the pin boss supports ( ), and in that the piston upper part ( ) and the piston lower part ( ) are non-detachably connected by means of the connection surfaces of the ring rib ( ) and the carrier rib ( ).

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Aspach, Germany

Gerhard Berr