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 (JP)
OOHASHI KENYA (JP)
KAGIYAMA ARATA (JP)
YAMAKA KOICHI (JP)
MAEKAWA NORIYUKI (JP)
OOHASHI KENYA (JP)
KAGIYAMA ARATA (JP)
YAMAKA KOICHI (JP)
MAEKAWA NORIYUKI (JP)
Application Number:
PCT/JP2018/045023
Publication Date:
July 04, 2019
Filing Date:
December 07, 2018
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02M59/44; F02M59/46
Foreign References:
| JP2003148294A | 2003-05-21 | |||
| JPS59169696A | 1984-09-25 | |||
| JP2012166237A | 2012-09-06 | |||
| JP2001288521A | 2001-10-19 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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