Sintered alloy valve seat and method for manufacturing the same
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United States of America Patent
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Aug 15, 2006
Grant Date -
Sep 30, 2004
app pub date -
Jan 7, 2004
filing date -
Jan 10, 2003
priority date (Note) -
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Abstract
A valve seat, press-fitted into a cylinder head of an internal combustion engine, containing an iron-based sintered alloy, includes a valve-seating section and a head-seating section. The valve-seating section and the head-seating section are monolithically formed by a sintering process and form a double layer structure. The valve-seating section includes a first iron-based sintered alloy member that has a porosity of 10 to 25 percent by volume and a sintered density of 6.1 to 7.1 g/cm.sup.3 and contains hard particles dispersed in a matrix. The head-seating section includes a second iron-based sintered alloy member that has a porosity of 10 to 20 percent by volume and a sintered density of 6.4 to 7.1 g/cm.sup.3.
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