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Title:
HIGH-PRESSURE FUEL SUPPLY PUMP
Document Type and Number:
WIPO Patent Application WO/2018/003415
Kind Code:
A1
Abstract:
The purpose of the present invention is to configure a discharge valve mechanism such that the amount of back flow of fuel from a discharge valve is reduced, the discharge valve mechanism being provided at the outlet of the pressurizing chamber of a high-pressure fuel supply pump, and such that cavitation erosion is prevented. This high-pressure fuel supply pump is provided with: a discharge valve disposed on the discharge side of a pressurizing chamber; a discharge valve seat on which the discharge valve sits to close the discharge-side passage of the pressurizing chamber; and a discharge valve spring for pressing the discharge valve toward the discharge valve seat. The high-pressure fuel supply pump is characterized by being configured such that, if the minimum seat diameter of the seat section of the discharge valve seat, on which the discharge valve sits, is D, and the spring force of the valve spring in a set position is F, then a coefficient K obtained by dividing the spring force F by the minimum seat diameter D is 0.2 or greater.

Inventors:
NEMOTO Masashi (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
OMATA Shigehiko (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
AKIYAMA Moritsugu (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
ARITOMI Shunsuke (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
OGINUMA Takanori (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2017/020790
Publication Date:
January 04, 2018
Filing Date:
June 05, 2017
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
F02M59/46
Foreign References:
JP2002250258A2002-09-06
JP2014148980A2014-08-21
JP2002227746A2002-08-14
JP2003097385A2003-04-03
JPH0228565U1990-02-23
JP2010112303A2010-05-20
JP2011080391A2011-04-21
JP5180365B22013-04-10
Attorney, Agent or Firm:
TODA Yuji (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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