Cylinder head with valve seat and method for the production thereof
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United States of America Patent
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Aug 2, 2016
Grant Date -
Oct 6, 2011
app pub date -
Aug 3, 2009
filing date -
Aug 1, 2008
priority date (Note) -
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Abstract
Cylinder head made of cast iron has valve seats provided therein. The valve seats include an annular bore provided in the cast-iron material, a nickel-based intermediate layer which is provided thereon and a contact layer which is provided on said intermediate layer. The contact layer has an air-hardening tool steel, wherein said layers are provided in such a manner that an annularly acting compressive stress is present near the free surface of said contact layer. The invention further includes a method for the production thereof.
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