EJECTION VALVE MECHANISM AND HIGH-PRESSURE FUEL SUPPLY PUMP PROVIDED WITH SAME

Title:

EJECTION VALVE MECHANISM AND HIGH-PRESSURE FUEL SUPPLY PUMP PROVIDED WITH SAME

Document Type and Number:

WIPO Patent Application WO/2021/140829

Kind Code:

A1

Abstract:

Provided are an ejection valve mechanism capable of improving responsiveness during opening of an ejection valve and a high-pressure fuel supply pump provided with the same. An ejection valve mechanism 500 is provided with: a valve seat part 51 having a primary-side flow path; a valve body 52 capable of being seated on and separated from the valve seat part 51; and a guide part 542a that is formed to be capable of coming into sliding contact with an outer surface of the valve body 52 and guides movement of the valve body 52 in a contact/separation direction with respect to the valve seat part 51. The guide part 524a includes a portion with which a gap between the guide part 542a and the outer surface of the valve body 52 is set to be a prescribed value or less. A first secondary-side flow path 545 that establishes communication between an internal space 541a upstream of the guide part 542a and an external flow path 2g is formed to cause a fluid to laterally outflow in a movement direction of the valve body 52. A second secondary-side flow path 546 that establishes communication between an internal space 543a downstream of the guide part 542a and the external flow path 2g is formed to cause a fluid to laterally outflow in the movement direction of the valve body 52.

More Like This:

WO/2001/053695	INJECTION DEVICE AND METHOD FOR INJECTION OF FLUIDS
JP5830492	High pressure pump
WO/2009/007195	CONTROL VALVE, PARTICULARLY FOR A FUEL INJECTOR OF AN INTERNAL COMBUSTION ENGINE

Inventors:

TOKUO KENICHIRO (JP)
YAMADA HIROYUKI (JP)
OGURA KIYOTAKA (JP)
TAMURA SHINGO (JP)
ISHIZUKA YUTO (JP)

Application Number:

PCT/JP2020/046235

Publication Date:

July 15, 2021

Filing Date:

December 11, 2020

Export Citation:

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Assignee:

HITACHI ASTEMO LTD (JP)

International Classes:

F02M59/46

Domestic Patent References:

WO2019012970A1	2019-01-17
WO2015163246A1	2015-10-29

Foreign References:

JP2019031977A	2019-02-28
CN205446004U	2016-08-10
DE102014212646A1	2015-10-15

Attorney, Agent or Firm:

TODA Yuji (JP)

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