Internal-combustion engines – Valve – Valve seat relation
Reexamination Certificate
2006-08-15
2006-08-15
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Valve
Valve seat relation
C029S888440
Reexamination Certificate
active
07089902
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/cm3and 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/cm3.
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Ishida Masao
Kakiuchi Arata
Oketani Hiroyuki
Sato Ken'ichi
Takahashi Teruo
Ali Hyder
Argenbright Tony M.
Crowell & Moring LLP
Honda Motor Co. Ltd.
Nippon Piston Ring Co. Ltd.
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