Hitachi Automotive Systems, Ltd.

Arata Kagiyama

Satoshi Usui

Noriyuki Maekawa

Masayuki Suganami

Minoru Hashida

Atsushi Hohkita

Kenya Ohashi

Koichi Yamaka

Mina Amo

Masaru Kawai

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

High-pressure fuel supply pump and method of manufacturing the same

It is an object of the present invention to provide a high-pressure fuel supply pump having a pump body capable of improving corrosion resistance and weldability and being manufacturable by forging. Therefore, in the high-pressure fuel supply pump having a metal pump body forming a pressurizing chamber, the pump body is made of a steel material containing 12% to 18% of Cr and 3% to 7% of Ni, and the pump body has a forging surface on a part of the outer peripheral surface.

High-pressure fuel supply pump

Growing community of inventors

Hitachinaka, Japan

Arata Kagiyama