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US 9,790,889 B2Granted
Piston
AssigneeMahle International GmbH
InventorsChristoph Beerens, Dieter Emmrich, Christoph Luven, Uwe Mohr, Reinhard Rose
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine may include a surface in a region on a crankshaft side. The piston may include a thermally conductive coating disposed on the surface via thermal spraying.
Claims17
A piston for an internal combustion engine, comprising:
- a surface of a metal piston part in a region on a crankshaft side including a thermally conductive coating disposed on the surface via cold gas spraying, wherein the thermally conductive coating is secured to the surface via a mechanical adhesive bond without heat modification to the piston part;
- and
- an adhesion layer disposed on the surface to provide an adhesive base for receiving the thermally conductive coating, the adhesion layer including at least one of aluminium and nickel;
- wherein the thermally conductive coating is disposed on the surface between a hub and a combustion chamber, and the thermally conductive coating extends along a linear path to conduct heat from a centre region towards an annular cooling duct.
1 more element
A method of manufacturing a piston, comprising:
- producing a thermally conductive coating from a powder having a grain size of 15 μm to 25 μm;
- and
- applying the thermally conductive coating to a surface of a metal piston part in a region on a crankshaft side via cold gas spraying, wherein the thermally conductive coating includes at least one of aluminium, silver and copper, and defines a roughness Ra of 0.5 μm to 4.0 μm;
- and
- covering the thermally conductive coating via a protective layer, wherein at least one of:
- (i) the protective layer is configured to act non-catalytically and includes at least one of nickel, chrome, silver and tin applied via galvanic deposition by immersion or includes at least one of nickel, silver and tin applied via currentless deposition by immersion and (ii) the protective layer undergoes a treating step with liver of sulphur.
3 more elements
A piston for an internal combustion engine, comprising:
- a metallic upper part having an outer surface facing a combustion chamber and an inner surface facing a direction of a crankshaft;
- a thermally conductive coating disposed on the inner surface via cold gas spraying, the thermally conductive coating including at least one of aluminium, silver and copper, and wherein the thermally conductive coating is secured to the surface via a mechanical adhesive bond without heat modification to the metallurgy of the upper part;
- a protective layer overlaying the thermally conductive coating, wherein the protective layer at least one of (i) includes a non-catalytic composition, and (ii) is sulphurized;
- wherein the non-catalytic composition includes a galvanic immersion deposited material or a currentless immersion deposited material;
- and
- wherein the thermally conductive coating is disposed on the inner surface between a hub and the combustion chamber, and the thermally conductive coating extends along a linear path to conduct heat from a centre region towards an annular cooling duct.
3 more elements
Dependencies are inferred from the claim text.