Piston and tribological system consisting of a piston and a cylinder running surface of a cylinder crank case for an internal combustion engine
AssigneeMahle International GmbH
InventorsStephan Korner, Wolfgang Schlenther, Cedric Dobua
Life of this patent
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Abstract
A piston for an internal combustion engine may include a piston head and a piston skirt. The piston skirt may have piston bosses provided with boss bores. The piston bosses may be connected to each other at running surfaces. The running surfaces may be provided at least partially with a coating which is sprayed using a cold gas method. The material of the coating may be selected from the group comprising at least one of nickel, iron, copper, nickel-based alloys, iron-based alloys, copper-nickel-tin-based alloys and copper-tin-silver-based alloys.
Claims18
A piston for an internal combustion engine, comprising:
- a piston head and a piston skirt, wherein the piston skirt has piston bosses provided with boss bores and the piston bosses are connected to each other at running surfaces,
- further wherein the running surfaces are provided at least partially with a coating which is sprayed using a cold gas method and that the material of the coating is selected from the group comprising at least one of nickel, iron, copper, nickel-based alloys, iron-based alloys, copper-nickel-tin-based alloys and copper-tin-silver-based alloys;
- further wherein the running surfaces are configured to form a tribological system together with an opposing running surface of a cylinder bore that is provided with another coating.
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8-20. (canceled)
A piston for an internal combustion engine, comprising:
- a piston head and a piston skirt, wherein the piston skirt has piston bosses provided with boss bores and the piston bosses are connected to each other at running surfaces,
- further wherein the running surfaces are provided at least partially with a coating which is sprayed using a cold gas method and that the material of the coating is selected from the group comprising at least one of nickel, iron, copper, nickel-based alloys, iron-based alloys, copper-nickel-tin-based alloys and copper-tin-silver-based alloys;
- wherein the coating has a roughness Ra of approximately 0.5 μm to 4.0 μm;
- wherein the running surfaces are configured to form a tribological system together with an opposing running surface of a cylinder bore that is provided with another coating.
A piston for an internal combustion engine, comprising:
- a piston head and a piston skirt, wherein the piston skirt has piston bosses provided with boss bores and the piston bosses are connected to each other at running surfaces,
- further wherein the running surfaces are provided at least partially with a coating which is sprayed using a cold gas method and that the material of the coating is selected from the group comprising at least one of nickel, iron, copper, nickel-based alloys, iron-based alloys, copper-nickel-tin-based alloys and copper-tin-silver-based alloys;
- wherein the coating has a layer thickness of approximately 100 μm to 300 μm, and wherein the coating is produced from a powder, which is sprayed using the cold gas method and has a grain size of approximately 15 μm to 25 μm;
- wherein the running surfaces are configured to form a tribological system together with an opposing running surface of a cylinder bore that is provided with another coating.
Dependencies are inferred from the claim text.