Piston-Cylinder assembly of an internal combustion engine
AssigneeMahle GmbH
InventorChristoph Hannig
Life of this patent
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Abstract
A piston having at least one piston ring in combination with a cylinder of a two-stroke internal combustion engine. The piston is made from an aluminum alloy and has a running layer covering at least 80% of the running surface of the piston. The running layer is made from resin-bound graphite. The piston ring has a crowned running surface and is made from cast iron or steel. The cylinder includes a running surface where at least the running surface is made from an aluminum alloy. The running surface has a roughness of less than 1 micron. The running layer on the piston has a thickness between 10 and 20 microns. The graphite particles which form the running layer have a size between 1 and 10 microns.
Claims15
A piston having at least one piston ring in combination with a cylinder of a two-stroke internal combustion engine comprising:
- a piston made from an aluminum alloy including a running surface with a running layer covering at least 80% of said running surface, said running layer being made from resin-bound graphite;
- at least one piston ring with a crowned running surface, said at least one piston ring being made from a material selected from the group consisting of cast iron and steel;
- and
- a cylinder including a running surface where at least said running surface is made from an aluminum alloy, wherein said running surface has a roughness of R.sub.a of less than one (1) micron.
Dependencies are inferred from the claim text.