A piston engine has a cooling passage integrated within the piston crown (2) and surrounding rim (3). The cooling passage is formed by rolling the forged rim over the piston neck zone to join the neck (5).

The piston (1) for an internal combustion engine has a top section (2) with a ring zone (4) and an encompassing recess (8), and bottom section (3) with cylinder bearing surfaces (9) and piston pin holes (11). The top and bottom sections are interconnected ...

Production of a cooling channel piston comprises shaping a piston blank at least partly in a forging process. At least one peripheral collar and a recess (6) behind the collar are produced during the forging process. The collar is then reshaped so that the...

The opening is manufactured by a circular milling operation.

The piston comprises a base section (1) which with an annular section (3) forms a cooling passage to which is supplied cooling medium via a hole. After the final machining of the piston at least one additional opening exists between the base section and an...

The piston (1) has a gudgeon pin bore (4) for accommodating a gudgeon pin (5) and a cooling channel (6) arranged in the region between the bore and a piston combustion surface (9), especially within an annular field (2). The cooling channel has at least on...