Multi-part piston for an internal combustion engine and method for its production
First Claim
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1. A multi-part piston for an internal combustion engine, comprising:
- an upper piston part having an inner support element and an outer support element; and
a lower piston part having an inner support element and an outer support element,wherein said support elements delimit an outer circumferential cooling channel and an inner cooling chamber, wherein both the inner support element of the upper piston part and the inner support element of the lower piston part have at least one recess on their surfaces, said at least one recess on the upper piston part and said at least one recess on the lower piston part being positioned to align with each other, and wherein the upper piston part and the lower piston part are connected with one another by means of pressure welding.
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Abstract
A method for producing a multi-part piston for an internal combustion engine and the piston itself, which has an upper piston part and a lower piston part, each having an inner and an outer support element, which elements delimit an outer circumferential cooling channel and an inner cooling chamber. The inner support element of the upper piston part and/or the inner support element of the lower piston part have at least one recess on their surface. The upper piston part and the lower piston part are connected with one another by pressure welding.
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Citations
11 Claims
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1. A multi-part piston for an internal combustion engine, comprising:
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an upper piston part having an inner support element and an outer support element; and a lower piston part having an inner support element and an outer support element, wherein said support elements delimit an outer circumferential cooling channel and an inner cooling chamber, wherein both the inner support element of the upper piston part and the inner support element of the lower piston part have at least one recess on their surfaces, said at least one recess on the upper piston part and said at least one recess on the lower piston part being positioned to align with each other, and wherein the upper piston part and the lower piston part are connected with one another by means of pressure welding. - View Dependent Claims (2, 3, 4, 5)
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6. A method for the production of a multi-part piston for an internal combustion engine, having an upper piston part and a lower piston part, wherein 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 and an inner cooling chamber, comprising the following method steps:
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producing the upper piston part and the lower piston part; introducing at least one recess into a surface of the inner support element of the upper piston part and introducing at least one recess into the surface of the inner support element of the lower piston part; positioning said recesses so that they are aligned with one another before pressure welding; and connecting the upper piston part and the lower piston part by pressure welding. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification