Ks Kolbenschmidt Gmbh

Eberhard Weiss

Emmerich Ottliczky

Gerhard Luz

Ingo Roth

A steel piston () for a combustion engine, having an upper part in which a ring section () with at least one ring groove () is arranged, wherein the upper part is adjoined by a lower part that has two opposing skirt wall sections (), wherein the two skirt wall sections () are connected via two mutually opposite case walls (), wherein a pin bore () surrounded by a piston boss () is provided in each case wall (). In one example, there is at least one aperture () or at least one recess in the case wall () in the region between the piston boss () and the skirt wall section ().

Steel piston with optimized design

A piston, in particular, a gallery-cooled piston for an internal combustion engine has a piston bottom part and a piston upper part which are connected in a joining process to produce the piston. The piston upper part has at least one ring zone and an inner wall. The piston bottom part has a radially circumferential oblique surface at the end which faces the piston upper part. The oblique surface, interacting with the inner wall of the piston upper part, brings about a centering action during the joining process of the piston parts. A joining method for manufacturing a piston is also disclosed.

Joined connection on a two-part piston and joining method

A piston for an internal combustion engine includes a piston upper part and a piston lower part having a cooling channel including at least one inlet opening. A dam-type elevation is formed in the region of the at least one inlet opening through forging of the dam elevation in the cooling channel portion in the piston lower part. In one example, a funnel-shaped inlet contour is formed in the inlet opening by pre-forging. In one example, a V-shaped element is formed in the piston upper part cooling chamber portion in alignment with the inlet opening and used as a coolant jet splitter.

Cooling channel having dam and funnel

The invention discloses a method for producing an internal combustion engine piston having at least one cavity which is filled with an alkali metal cooling medium and is subsequently closed. The at least one cavity longitudinally extends from a central point into the piston body toward the piston circumference. The invention further discloses a piston produced according to the method.

Growing community of inventors

Langenbrettach, Germany

Eberhard Weiss