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Patent Searching and Data


Title:
FUEL SUPPLY PUMP
Document Type and Number:
WIPO Patent Application WO/2019/131049
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a fuel supply pump that, in order to suppress seizing of a plunger which can occur with higher fuel pressures, improves lubrication of the plunger that moves reciprocally along the inner circumference of a cylinder. This fuel supply pump comprises a plunger that moves reciprocally in the inner circumferential section of a cylinder, and a pressurization chamber that is pressurized by the plunger, wherein an annular groove is formed in an outer circumferential section of the plunger, and at bottom dead center, the annular groove is configured so as to be positioned closer to the pressurization chamber than to an axial-direction central position of a cylinder sliding region.

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Inventors:
TAMURA Shingo (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
TOKUO Kenichiro (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
SUGANAMI Masayuki (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
TOKUMARU Kazuaki (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2018/045020
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; F02M59/34
Foreign References:
JPH11280601A1999-10-15
JP2001041129A2001-02-13
JP2006307829A2006-11-09
JP2004340052A2004-12-02
JP2003222062A2003-08-08
Attorney, Agent or Firm:
TODA Yuji (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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