F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
F02M 25/07 (2006.01)
Patent
CA 2050457
An EGR valve assembly for use in an EGR valve body having a chamber with an inlet and outlet, comprising: (a) a stemmed reciprocable valve controlling flow into said chamber, the stem of said valve being constituted of an iron-based core material (i.e., 300 series stainless steel) impregnated at its outer surface with an ingredient (i.e., electroless nickel, ion implanted or chemically deposited nitrides, and electrolytic chromium) that is compatible in sliding contact with ceramic and provides said stem with a hardness at room temperature of at least 60 Rc and a lubricating oxidized passivation layer at temperatures in excess of 600°C; and (b) a ceramic-based bushing (SiC, Si3N4, Al2O3, ceramic/metal composite) for sealingly guiding the reciprocal movement of said stem.
Soupape destinée à incorporation dans un corps de soupape RGE possédant une chambre dotée d'un orifice d'admission et d'un orifice de sortie et comportant :a) une soupape à mouvement alternatif commandant le débit des gaz à l'intérieur de la chambre en question, celle-ci étant dotée d'une tige composée d'un matériau à base de fer (acier inoxydable de série 300, p. ex.) et dont la surface extérieure est imprégnée d'un ingrédient qui assure la compatibilité au glissement sur des surfaces de céramique et qui confère à la tige une dureté à température ambiante d'au moins 60 Rc combinée à une couche de passivation oxydée appliquée à des températures supérieures à 600 degrés C; b) un coussinet à base de céramique (composé céramique/métal de SiC, Si3N4, Al203) assure le guidage et l'étanchéité de la tige de soupape à mouvement alternatif.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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