Joined type valve seat

Details Joined type valve seat Joined type valve seat

1997-06-05

1998-09-08

Solis, Erick R.

Internal-combustion engines

Valve

Valve seat relation

251360, F01L 304

Patent

active

058030379

ABSTRACT:
The invention is directed to a joined type valve seat which is joined into the cylinder head of an aluminum alloy in an internal combustion engine by resistance welding and, in particular, to an improved joined type valve seat superior in strength, rigidity, and abrasion resistance, whereby no cracks are caused when running the engine or when joining the valve seat to the engine block by resistance welding. The valve seat is made of a material having a tensile strength of 300 MPa or above, a radial crushing strength of 500 MPa or above, an elongation of 0.6% or more, a thermal conductivity of 15 W/(m.multidot.K) or above, a coefficient of thermal expansion of 10.times.10-.sup.6 (1/K) or above, and an electric resistivity of 50 .mu..OMEGA..multidot.cm or below.

REFERENCES:
patent: 4422875 (1983-12-01), Nakata et al.
patent: 4424953 (1984-01-01), Takagi et al.
patent: 4546737 (1985-10-01), Kazuoka et al.
patent: 4734968 (1988-04-01), Kuroishi et al.
patent: 4933008 (1990-06-01), Fujiki et al.
patent: 5031878 (1991-07-01), Ishikawa et al.
patent: 5611306 (1997-03-01), Takano

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