The present invention relates to a piston (10) for an internal combustion engine, which has a piston skirt (14) as well as a piston head (13) having a circumferential ring belt (21) and having a circumferential cooling channel (24) closed off with a closure element (26), wherein a circumferential recess (23) is formed between the piston head (13) and the piston skirt (14). According to the invention, it is provided that the closure element (26) consists of at least two subcomponents (27, 28), that each subcomponent (27, 28) has a radially oriented base plate (29) and at least one circumferential collar (31) oriented axially on the outer edge (29a) of the base plate (29), which collar is accommodated in at least one outer fold (34) that runs underneath the ring belt (21).

A piston for an internal combustion engine, configured as a gallery-cooled piston of two-piece construction includes a main body and a ring element. The ring element which has a ring zone and a fire land encloses a cooling gallery on the outside, which cooling gallery is delimited on the inside by an intermediate wall which separates the cooling gallery from a combustion chamber recess which is made in a piston head of the main body. The main body and the ring element together form two circumferential dividing planes which are offset with respect to one another, to which end in each case two interacting joining webs of the ring element and of the main body are connected with a material-to-material bond.

The present invention relates to a multi-piece, in particular at least two-piece, piston (1) for an internal combustion engine having a longitudinal axis (L), comprising a piston outer part (10) having a closed piston head (11), which in the fitted state defines a combustion chamber, and a piston body (13) extending axially away from the piston head (11), and a piston inner part (20), which in the fitted state is connected to a connecting rod. An outer surface (2) radially defining the piston (1) is formed exclusively by at least one portion of the piston body (13) of the piston outer part (10). The piston inner part (20), viewed in an axial direction, is arranged radially entirely inside the piston body (13) or its circumferential surface.

A method for producing a piston may include producing a piston top part and a piston bottom part each including an inner support element having an inner joining surface and an outer support element having an outer joining surface. At least one of the joining surfaces may include a solder depository. The method may also include pre-machining at least one of the joining surfaces and introducing a high-temperature soldering material in at least one solder depository. The method may further include assembling the piston top part and the piston bottom part to form a piston body via creating at least one of circular contact and linear contact between the joining surfaces such that a gap width is 20 m to 150 m. The method may also include transferring the piston body into a soldering oven, melting the high-temperature soldering material via heating the piston body, and cooling the piston body.

A piston for an internal combustion engine includes a lower portion and an upper portion. An upper joining plane is positioned between the upper and lower extending through the outer circumference of the piston. At least one lower joining plane is positioned between the upper and lower portions. A solder gap is defined in the upper and lower joining planes wherein a solder containing iron is inserted to fixedly join the upper and lower portions together. Methods for producing pistons through connection of the lower portion to the upper portion with solder are also disclosed.

A piston for an internal combustion engine includes a lower portion and an upper portion. An upper joining plane is positioned between the upper and lower extending through the outer circumference of the piston. At least one lower joining plane is positioned between the upper and lower portions. A solder gap is defined in the upper and lower joining planes wherein a solder containing iron is inserted to fixedly join the upper and lower portions together. Methods for producing pistons through connection of the lower portion to the upper portion with solder are also disclosed.

The present invention relates to a multi-piece, in particular at least two-piece, piston (1) for an internal combustion engine having a longitudinal axis (L), comprising a piston outer part (10) having a closed piston head (11), which in the fitted state defines a combustion chamber, and a piston body (13) extending axially away from the piston head (11), and a piston inner part (20), which in the fitted state is connected to a connecting rod. An outer surface (2) radially defining the piston (1) is formed exclusively by at least one portion of the piston body (13) of the piston outer part (10). The piston inner part (20), viewed in an axial direction, is arranged radially entirely inside the piston body (13) or its circumferential surface.

A method for producing a piston may include producing a piston top part and a piston bottom part each including an inner support element having an inner joining surface and an outer support element having an outer joining surface. At least one of the joining surfaces may include a solder depository. The method may also include pre-machining at least one of the joining surfaces and introducing a high-temperature soldering material in at least one solder depository. The method may further include assembling the piston top part and the piston bottom part to form a piston body via creating at least one of circular contact and linear contact between the joining surfaces such that a gap width is 20 m to 150 m. The method may also include transferring the piston body into a soldering oven, melting the high-temperature soldering material via heating the piston body, and cooling the piston body.