Mahle International Gmbh

Heckman, William

Volker Weisse

Rainer Scharp

Klaus Keller

Dieter Gabriel

Wolfgang Rein

Steve Walker

Christian Peschke

Michael Ulrich

Helmut Edel

Andreas Seeger-Van Nie

Zeynep Kara

Achim Fedyna

Ralner Scharp

Dobua Cedric

William Heckman

Rein Wolfgang

An exemplary piston may include a piston body having radially inner and outer body mating surfaces. The piston may further include a cooling gallery ring cooperating with the piston body to form a continuous upper combustion bowl surface and a cooling gallery. The cooling gallery ring may have radially inner and outer ring mating surfaces abutted along their corresponding radially inner and outer body mating surfaces, such that the cooling gallery is substantially enclosed. The piston body and cooling gallery ring may be joined together along the radially inner and radially outer interface regions to form a generally one-piece piston assembly. The radially outer interface region may be elongated in a direction parallel to the piston axis, e.g., facilitating a laser welding joining process.

Laser welded piston assembly

A piston for an internal combustion engine, having a piston base body, a piston ring element having at least an inner region of a piston crown, and a piston skirt. The piston is provided with pin bosses having pin bores and the ring element has at least an outer region of a piston crown having a circumferential top land and a circumferential ring belt provided with ring grooves. The piston base body and piston ring element are joined together by way of corresponding, conical joining surfaces configured on them.

Piston for an internal combustion engine and method for its production

A method for the production of a multi-part piston for an internal combustion engine involves producing an upper piston part having a piston crown as well as an inner and an outer support element, and producing a lower piston part having a skirt and having pin boss supports and pin bosses connected with the pin boss supports, and an inner and an outer support element. A separate cooling oil collector having at least one cooling oil opening is inserted into the upper piston part or the lower piston part. The upper piston part and the lower piston part are connected in such a manner that the inner and outer support elements of the upper and lower piston parts, delimit an outer circumferential cooling channel and a cavity that is open toward the pin bosses and provided with the cooling oil collector.

Multi-part piston for an internal combustion engine and method for its production

A multi-part piston for an internal combustion engine has an upper piston part having a piston crown, and a lower piston part. The lower piston part has pin boss supports and pin bosses connected with them and the upper piston part and the lower piston part each have an inner and an outer support element, which elements delimit an outer circumferential cooling channel. The inner support elements delimit a cavity that is open toward the pin bosses. The cavity has a separate cooling oil collector that has at least one cooling oil opening. The piston is produced by manufacturing the upper piston part and lower piston part, inserting the cooling oil collector into the upper piston part or lower piston part, and joining the upper and lower piston parts together by friction welding.

The present invention relates to a multi-part piston () for an internal combustion engine, having an upper piston part () having a piston crown (), and a lower piston part (), whereby the lower piston part () has pin boss supports () and pin bosses () connected with them, whereby the upper piston part () and the lower piston part () each have an inner () and an outer () support element, which elements delimit an outer circumferential cooling channel (). According to the invention, it is provided that the inner support elements () delimit a cavity () that is open toward the pin bosses (), and that the cavity () is provided with a separate cooling oil collector () that has at least one cooling oil opening ().

A multi-part piston for an internal combustion engine has an upper piston part with a piston crown, and a lower piston part with pin boss supports and pin bosses connected with the pin boss supports. The upper piston part and the lower piston part each have an inner and an outer support element, which elements delimit an outer circumferential cooling channel. The inner support elements delimit a cavity that is open toward the pin bosses. The cavity is provided with a separate cooling oil collector that has at least one cooling oil opening.

The present invention relates to a multi-part piston () for an internal combustion engine, having an upper piston part () having a piston crown (), and a lower piston part (), whereby the lower piston part () has pin boss supports () and pin bosses () connected with them, whereby the upper piston part () and the lower piston part () each have an inner () and an outer () support element, which elements delimit an outer circumferential cooling channel (). According to the invention, it is provided that the inner support elements () delimit a cavity () that is open toward the pin bosses (), and that the cavity () is provided with a separate cooling oil collector () that has at least one cooling oil opening (). The present invention furthermore relates to a method for the production of such a piston.

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Stuttgart, Germany

Volker Weisse