EGR control valve having ceramic elements

Details EGR control valve having ceramic elements EGR control valve having ceramic elements

1990-10-22

1991-10-01

Nilson, Robert G.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

251368, 277 962, F02M 2506

Patent

active

050523635

ABSTRACT:
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 seeries 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 R.sub.c and a lubricating oxidized passivation layer at a temperatures in excess of 600.degree. C., and (b) a ceramic-based bushing (SiC, Si.sub.3 N.sub.4, Al.sub.2 O.sub.3, ceramic/metal composite) for sealingly guiding the reciprocal movement of said stem.

REFERENCES:
patent: 4044737 (1977-08-01), Nishimura
patent: 4693481 (1987-09-01), Quinn
patent: 4871297 (1989-10-01), Boes

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