Valve mechanism and high-pressure fuel supply pump equipped with this

Title:

Valve mechanism and high-pressure fuel supply pump equipped with this

Document Type and Number:

Japanese Patent JP6342020

Kind Code:

B2

Abstract:

Provided is a solution to a problem on a discharge valve mechanism disposed at an exit of a pressurizing chamber of a high-pressure fuel supply pump, that is, an occurrence of a backward flow of the fuel concentrates on a limited fuel passage, leading to a higher fuel flow rate, and this easily induces the occurrence of cavitation, and collapse of the generated cavitation might damage a seat surface, making it difficult to maintain valve functions. The present invention provides a valve mechanism including a seat member having a seat section, a valve body configured to attach to or detached from the seat section, and a housing member arranged on an outer peripheral side of the seat member. A first fluid flow-path is formed to connect an inner peripheral side and an outer peripheral side of the seat section in a case where the valve is detached from the seat section. A second fluid flow-path is formed to be connected with the first fluid flow-path, between an outer peripheral surface of the seat member and an inner peripheral surface of the housing member, or between an outer peripheral surface of the valve body and the inner peripheral surface of the housing member. The cross-sectional area along the axial direction of the valve mechanism of the second fluid flow-path is 0.18 mm square or above.

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Inventors:

Akiyama Souji
Shigehiko Omata
Shigenori Tahara
Katsutoshi Kobayashi
Kenichiro Tokuo

Application Number:

JP2016571895A

Publication Date:

June 13, 2018

Filing Date:

January 08, 2016

Export Citation:

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Assignee:

Hitachi Automotive Systems, Ltd.

International Classes:

F02M59/46; F16K15/06; F16K47/02

Domestic Patent References:

JP2006207451A
JP5007958U
JP7259696A
JP2086958A
JP2003097387A

Foreign References:

DE102012222826A1

Attorney, Agent or Firm:

Kaichi International Patent Office

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