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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11015231 B1

PDFFull Text
Date of Patent:
May. 25, 2021

Filed:

Nov. 29, 2019

Method of manufacturing fuel rail for gasoline direct injection

Applicant:

Usui Co., Ltd., Shizuoka, JP;

Inventor:

Koichi Hayashi, Shizuoka, JP;

Assignee:

USUI CO., LTD., Shizuoka, JP;

Attorneys:

Yokoi & Co, U.S.A.

Toshiyuki Yokoi

Primary Examiner:

Kiley S Stoner

Int. Cl.
CPC ...
B23K 1/00 (2006.01); C21D 9/08 (2006.01); C22C 38/12 (2006.01); F02M 55/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); F02M 55/02 (2006.01); B23K 103/04 (2006.01); B23K 101/04 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); B23K 1/0008 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/44 (2013.01); F02M 55/025 (2013.01); F02M 55/04 (2013.01); B23K 2101/04 (2018.08); B23K 2103/04 (2018.08); C21D 2211/002 (2013.01); F02M 2200/9053 (2013.01);
Abstract

To obtain, at low cost, a fuel rail that maintains low hardness and good formability before being formed into a tube stock, can be made to form a welded pipe, and has high-strength properties with which the fuel rail can withstand a high fuel pressure even when formed so as to be relatively thin. A fuel rail for gasoline direct injection that is used at a fuel pressure of at least 30 MPa and is formed from an iron-alloy welded pipe. The fuel rail comprises an iron alloy that contains chemical components of C, Si, Mn, P, S, Nb, and Mo. The plate thickness t and the outer diameter D of the fuel rail have a ratio t/D of 0.2 or less. A bainitic structure can be precipitated by brazing the fuel rail in a furnace during manufacturing.

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