ENGINE VALVE AND MANUFACTURING METHOD THEREFOR
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United States of America Patent
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Issued Date -
Jun 1, 2023
app pub date -
Jul 29, 2020
filing date -
Jul 29, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
An engine valve having a shaft portion and a head portion expanding in diameter like a head at an edge of the shaft portion, and being to open and close a port provided in a cylinder head, wherein the head portion has a head front surface on a bottom side facing a combustion chamber side, a head rear surface on a top side facing the port side, and an outer peripheral surface of the head portion formed between the head front surface and the head rear surface, and the head portion is provided a mirror-finished mirror portion, and the head portion is provided a mirror-finished mirror portion on the entire area of the head front surface exposed to the combustion chamber and the entire area of the outer peripheral surface exposed to the combustion chamber.
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