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公开(公告)号：US20230358151A1
公开(公告)日：2023-11-09
申请号：US18028436
申请日：2021-03-16
Applicant: FUJI OOZX Inc.
Inventor： Takaaki KUMAGAI , Koji KUSHIMA
CPC classification number: F01L3/12 , B21K1/24 , F01L3/02 , F16K49/00 , F01L2301/00 , F01L2303/00
Abstract: A hollow engine valve includes a shaft portion and an umbrella portion of which diameter is enlarged to form an umbrella shape to be provided on a base end of the shaft portion, a cooling material being enclosed in a hollow portion that is at least formed inside the shaft portion. The shaft portion comprises a first shaft portion in a tip end side, a second shaft portion that is provided in a base end side to have an outer diameter larger than that of the first shaft portion, and a stepped portion formed by a difference in the outer diameters between the first and second shaft portions. A wall thickness of the stepped portion is larger than that of the second shaft portion.
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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
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.
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