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Title:
HIGH-PRESSURE FUEL SUPPLY PUMP AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2019/131051
Kind Code:
A1
Abstract:
The object of the invention is to provide a high-pressure fuel supply pump in which the progress of corrosion and cavitation erosion can be suppressed even when the pressure becomes higher, or when biofuel or fuel with a high content ratio of biofuel is used, and a method of manufacturing the same. To attain this object, the high pressure fuel supply pump includes a discharge valve 51b that discharges the fuel and a discharge valve seat 51a on which the discharge valve 51b is seated, the discharge valve 51b and the discharge valve seat 51a have a ferrous material as the base material, a Co-based alloy layer 70b and a Cr-enriched portion 70b1 having a Cr concentration higher than that of the surrounding Co-based alloy layer 70b are formed on the surface of the discharge valve 51b, and a Co-based alloy layer 70a is formed on the surface of the discharge valve seat 51a.

Inventors:
AMO Mina (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
OOHASHI Kenya (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
KAGIYAMA Arata (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
YAMAKA Koichi (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
MAEKAWA Noriyuki (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2018/045023
Publication Date:
July 04, 2019
Filing Date:
December 07, 2018
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
F02M59/44; F02M59/46
Foreign References:
JP2003148294A2003-05-21
JPS59169696A1984-09-25
JP2012166237A2012-09-06
JP2001288521A2001-10-19
Attorney, Agent or Firm:
TODA Yuji (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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