US 10,801,438 B2Granted

Method for producing a piston

AssigneeMahle International GmbH

InventorsChristof Geissler, Jochen Kortas

Life of this patent

Estimating the term…

Loading patent…

Abstract

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 μm to 150 μm. 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.

Claims20

Dependent claims

A method for producing a piston, comprising:

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, wherein at least one of the inner joining surface of the piston top part, the inner joining surface of the piston bottom part, the outer joining surface of the piston top part, and the outer joining surface of the piston bottom part includes a solder depository;
pre-machining at least one of the inner joining surface of the piston top part, the inner joining surface of the piston bottom part, the outer joining surface of the piston top part, and the outer joining surface of the piston bottom part such that in a joined together state i) the inner joining surface of the piston top part and the inner joining surface of the piston bottom part, and ii) the outer joining surface of the piston top part and the outer joining surface of the piston bottom part do not butt flat against each other, and define a zero gap therebetween,
introducing a high-temperature soldering material in at least one solder depository;
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 i) between the inner joining surface of the piston top part and the inner joining surface of the piston bottom part, and ii) between the outer joining surfaces of the piston top part and the outer joining surface of the piston bottom part such that a gap width is 20 μm to 150 μm;
transferring the piston body into a soldering oven;
melting the high-temperature soldering material via heating the piston body to a soldering temperature of approximately 1300° C or less;
and
cooling the piston body until the high-temperature soldering material has completely solidified.

5 more elements

A piston comprising:

a piston top part including an inner support element having an inner joining surface and an outer support element having an outer joining surface;
a piston bottom part including an inner support element having an inner joining surface and an outer support element having an outer joining surface, the piston bottom part arranged such that i) the inner joining surface of the piston bottom part and the inner joining surface of the piston top part contact one another in at least one of a circular manner and linear manner defining an inner gap of 20 μm to 150 μm therebetween, and ii) the outer joining surface of the piston bottom part and the outer joining surface of the piston top part contact one another in at least one of a circular manner and linear manner defining an outer gap of 20 μm to 150 μm therebetween;
at least one solder depository disposed in one of the inner joining surface of the piston top part, the inner joining surface of the piston bottom part, the outer joining surface of the piston top part, and the outer joining surface of the piston bottom part;
and
a solder seam composed of a high-temperature soldering material disposed within the at least one solder depository, the inner gap, and the outer gap, the solder seam connecting the piston top part and the piston bottom part to define a piston body.

2 more elements

An internal combustion engine comprising at least one cylinder and a piston arranged therein, the piston including:

a piston top part including an inner support element having an inner joining surface and an outer support element having an outer joining surface;
a piston bottom part including an inner support element having an inner joining surface and an outer support element having an outer joining surface, the piston bottom part arranged such that i) the inner joining surface of the piston bottom part and the inner joining surface of the piston top part contact one another in at least one of a circular manner and linear manner defining an inner gap of 20 μm to 150 μm therebetween, and ii) the outer joining surface of the piston bottom part and the outer joining surface of the piston top part contact one another in at least one of a circular manner and linear manner defining an outer gap of 20 μm to 150 μm therebetween;
at least one solder depository disposed in one of the inner joining surface of the piston top part, the inner joining surface of the piston bottom part, the outer joining surface of the piston top part, and the outer joining surface of the piston bottom part;
and
a solder seam composed of a high-temperature soldering material disposed within the at least one solder depository, the inner gap, and the outer gap, the solder seam connecting the piston top part and the piston bottom part to define a piston body.

2 more elements

Dependencies are inferred from the claim text.