Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Reexamination Certificate
2005-09-01
2009-06-09
McMahon, M. (Department: 3741)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
C123S193100, C123S193300, C123S193400
Reexamination Certificate
active
07543557
ABSTRACT:
A piston and cylinder assembly for an engine is disclosed. The assembly includes a piston including an aluminum alloy piston body having a crown and a skirt extending from the crown. The skirt has an exterior surface having a surface finish in a wave form with peaks and valleys, and having a roughness total between approximately 6 and 12 micrometers, the roughness total (Rt) being defined as the difference between the highest peak and lowest valley within an assessment length. The surface finish has an approximate peak-to-peak distance between 0.17 and 0.25 millimeters within the assessment length. The exterior surface is coated with a nickel ceramic composite coating. An aluminum alloy cylinder bore is disposed in an engine block and is configured to receive the piston body. The cylinder bore has a bore surface having a roughness average (Ra) between approximately 0.09 and 0.25 micrometers. The cylinder bore may be made of a eutectic Al—Si alloy including other alloying elements.
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GM Global Technology Operations Inc.
McMahon M.
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