Title:
FUEL SUPPLY PUMP
Document Type and Number:
WIPO Patent Application WO/2018/016272
Kind Code:
A1
Abstract:
The objective of the present invention is to provide, by means of an inexpensive structure, a relief valve structure that exhibits a stable and high fuel release characteristic and a fuel supply pump equipped with this relief valve structure. The fuel supply pump is equipped with a pressurization chamber that pressurizes a fuel, and a relief valve mechanism that returns fuel (in a discharge passage downstream from a discharge valve) to the pressurization chamber or a low-pressure passage. The relief valve mechanism is equipped with: a valve seat that closes off a relief flow passage when the relief valve is seated; a relief valve holder that holds the relief valve; and a relief spring that biases the relief valve toward the valve seat via the relief valve holder. Hole parts are formed in the relief valve holder, and the hole parts penetrate an opposing part opposing the valve seat in the axial direction of the relief valve, and reduce the flow velocity of fuel flowing between the opposing part and the valve seat when the relief valve is open.
Inventors:
MATSUSHITA KOHEI (JP)
SHINTANI HIROSHI (JP)
OH U (JP)
MIZOBUCHI YASUO (JP)
TOKUO KENICHIRO (JP)
SHINTANI HIROSHI (JP)
OH U (JP)
MIZOBUCHI YASUO (JP)
TOKUO KENICHIRO (JP)
Application Number:
PCT/JP2017/023520
Publication Date:
January 25, 2018
Filing Date:
June 27, 2017
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02M59/34; F02M59/46
Foreign References:
| JP2016061196A | 2016-04-25 | |||
| JP2012211598A | 2012-11-01 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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