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US 2003/0150419 A1Published application
Piston having ceramic-coated ring groove
OwnerMehdi Daragheh, Andrew McGilvrayinventors
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OwnerMehdi Daragheh, Andrew McGilvrayinventors
Estimating the term…
In conventional pistons for internal combustion engines made from aluminum, magnesium, or the like, protection must be provided in the area in and around the ring grooves due to the wear and resultant microwelding between the piston ring groove and associated piston ring. One solution has been to cast the piston head around a separate protective ring made from steel or a similar material, which is costly and can negatively effect reliability and durability. In accordance with this invention, a hard ceramic reinforcing layer is provided on the outer surface of the piston in the area within the ring groove using a plasma electrolytic oxidation process. In this manner, the complexity and cost of the piston assembly is reduced while improving the reliability and durability. A piston according to this invention can be used to improve existing engine design that use a separate protective ring or can be used in new, cleansheet engine designs.
A piston for an internal combustion engine, said piston having at least one peripheral ring groove extending around the outer surface thereof, wherein the ring groove has an internal surface which is coated by a hard ceramic layer, said hard ceramic layer being formed by plasma electrolytic oxidation.
A method of manufacturing a piston for an internal combustion engine, said piston having at least one annular ring groove extending around the outer surface thereof, the ring groove having an internal surface, and said method including the step of:
A method of improving a design for an internal combustion engine comprising the steps of:
Dependencies are inferred from the claim text.