Piston for a reciprocating-piston internal combustion engine...

Details Piston for a reciprocating-piston internal combustion engine... Piston for a reciprocating-piston internal combustion engine...

2006-03-14

2010-11-09

Leslie, Michael (Department: 3745)

Expansible chamber devices

Piston

Open-ended hollow skirt type

C092S222000

Reexamination Certificate

active

07827902

ABSTRACT:
A piston made of a nitride-forming base alloy for a reciprocating internal combustion engine is disclosed. The piston includes a piston upper part having a plurality of peripheral piston ring grooves, each piston ring groove having two groove flanks, one of the piston ring grooves being closest to a combustion chamber of the internal combustion engine than the remaining piston ring grooves, the groove flanks of at least the one of the piston ring grooves being hardened using a boundary layer, the piston upper part including an external surface which includes the hardened groove flanks, and a wear and correction protection layer coating at least the external surface, the wear and correction protection layer includes a nitration layer. The nitration layer is generated by converting the nitride-forming base alloy by one of plasma nitration and plasma nitro-carburization in at least one of a nitrogen atmosphere and a nitrogen-carbon atmosphere.

REFERENCES:
patent: 4899702 (1990-02-01), Sasaki et al.
patent: 5158052 (1992-10-01), Yoshimura
patent: 2003/0150419 (2003-08-01), Daraghen et al.
patent: 198 33 825 (1999-12-01), None
patent: 102 21 800 (2003-12-01), None
Search Report dated Jul. 3, 2006 for the underlying International Application No. PCT/EP2006/002293.

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