Title:
FUEL PUMP
Document Type and Number:
WIPO Patent Application WO/2023/209949
Kind Code:
A1
Abstract:
The present invention provides a fuel pump that supplies fuel to a side having lower pressure than a seal member, which is prone to insufficient fuel supply, that achieves higher efficiency for a discharge flow rate, and that can prevent sticking of a plunger. The fuel pump comprises a seal member 20 that is disposed in an annular groove 2r provided in a sliding surface of a plunger 2, and that makes contact with a sliding surface of a cylinder 6. The annular groove 2r and the seal member 20 are provided between a compression chamber 11 and an auxiliary chamber 17a. The cylinder 6 has a communication hole (fuel supply hole 6d) that is connected to the auxiliary chamber 17a, on the cylinder sliding surface further to the auxiliary chamber 17a side than the seal member 20 in the axial direction of the plunger 2.
More Like This:
| WO/2000/055495 | FUEL FEED PUMP |
| JPH09177628 | PRESSURE CONTROL VALVE FOR FUEL PUMP |
Inventors:
ISHIZUKA YUTO (JP)
YAMADA HIROYUKI (JP)
HASHIDA MINORU (JP)
USUI SATOSHI (JP)
YAMADA HIROYUKI (JP)
HASHIDA MINORU (JP)
USUI SATOSHI (JP)
Application Number:
PCT/JP2022/019280
Publication Date:
November 02, 2023
Filing Date:
April 28, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F02M59/02; F02M59/44
Domestic Patent References:
| WO2019131049A1 | 2019-07-04 | |||
| WO2002055870A1 | 2002-07-18 | |||
| WO2018110206A1 | 2018-06-21 |
Foreign References:
| US20080224417A1 | 2008-09-18 | |||
| JPH07269461A | 1995-10-17 | |||
| JP2003206825A | 2003-07-25 | |||
| JP2008025425A | 2008-02-07 |
Attorney, Agent or Firm:
HIRAKI & ASSOCIATES (JP)
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