公开(公告)号：US20230167755A1

公开(公告)日：2023-06-01

申请号：US17922493

申请日：2020-07-29

Applicant: FUJI OOZX Inc.

Inventor： Takahiro TSUCHIYA ,  Takaaki KUMAGAI ,  Keigo NAKAJIMA ,  Koji KUSHIMA ,  Shingo AGATA

IPC: F01L3/04 ,  B21K1/22 ,  B24B29/00

CPC classification number: F01L3/04 ,  B21K1/22 ,  B24B29/005 ,  F01L2301/00 ,  F01L2303/00

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.