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.:
Date of Patent:
Sep. 28, 2021
Filed:
Dec. 07, 2018
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Mina Amo, Tokyo, JP;
Kenya Ohashi, Tokyo, JP;
Arata Kagiyama, Hitachinaka, JP;
Koichi Yamaka, Hitachinaka, JP;
Noriyuki Maekawa, Hitachinaka, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Abstract
Provided is a high-pressure fuel supply pump and a method of manufacturing thereof which can suppress the progress of corrosion and cavitation erosion even when the pressure becomes higher, or when biofuel or a fuel having a high oil content of biofuel is used. Therefore, the high-pressure fuel supply pump includes a discharge valvethat discharges fuel, and a discharge valve seaton which the discharge valveis seated. The base material of the discharge valveand the discharge valve seatis a steel material. On the surface of the discharge valve, a Co-based alloy layerand a Cr-enriched portionhaving a higher Cr concentration than the surrounding Co-based alloy layerare formed. The Co-based alloy layeris formed on the surface of the discharge valve seat