EP 0759519 B1 20021023 - Piston ring for internal combustion engine
Title (en)
Piston ring for internal combustion engine
Title (de)
Kolbenring für Verbrennungsmotoren
Title (fr)
Segment de piston pour moteur à combustion interne
Publication
Application
Priority
DE 19530511 A 19950818
Abstract (en)
[origin: EP0759519A2] Piston for diesel engines consists of a heat-resistant Al alloy with a ring nut and a piston ring. The novelty is that the piston ring is coated on its reverse side lying vertically to its axis with a hard carbon layer applied by plasma CVD. The ring nut is unprotected. The doped hard carbon layer has compsn.: a-C:H (where, a = amorphous material). The Al alloy consists of 2-6% Cu, 2-6% Ni, 0.5-2.0% Mg, up to 0.7% Fe, up to 0.5% Mn, and a balance of Al. The piston ring is coated on all sides with the hard carbon layer. The piston ring is finely processed to a surface roughness of ≤ 0.1 mu m before being coated with the carbon layer, the layer thickness being at least 2.5 (pref. 3 plus or minus 0.5) mu m. The piston ring is made of cast iron, pref. steel. The surface of the piston ring is nitrided below the coating. The outer periphery of the piston ring is coated with Cr, Mo, ceramic, bronze, Ni, SiC, TiC, Al2O3 or diamond.
IPC 1-7
IPC 8 full level
C22C 21/02 (2006.01); F16J 9/26 (2006.01)
CPC (source: EP)
C22C 21/02 (2013.01)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
DE 19530511 C1 19970220; DE 59609811 D1 20021128; EP 0759519 A2 19970226; EP 0759519 A3 19970312; EP 0759519 B1 20021023
DOCDB simple family (application)
DE 19530511 A 19950818; DE 59609811 T 19960802; EP 96112522 A 19960802