Exhaust valve for an internal combustion engine, and a method of strengthening an annular valve seat area in an exhaust valve
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United States of America Patent
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Oct 15, 2019
Grant Date -
Nov 1, 2018
app pub date -
Jul 9, 2018
filing date -
Apr 8, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An exhaust valve for an internal combustion engine comprises a valve disc having a first side (14) and a second side (16), a valve stem extending from the first side of the valve disc, and an annular valve seat area (11) located at the first side of the valve disc. The annular valve seat area (11) is of a nickel-base alloy or a chromium-base alloy and has a valve seat surface. The annular valve seat area has at least a first annular portion (43) located in between two second annular portions (42). The first annular portion has lower hardness than the two second annular portions.
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