Title:
FUEL PUMP
Document Type and Number:
WIPO Patent Application WO/2021/049247
Kind Code:
A1
Abstract:
Provided is a fuel pump with which it is possible to improve productivity. This fuel pump is provided with a pump body (1), a plunger (2), an electromagnetic suction intake valve (3), and a relief valve (4). The plunger (2) reciprocates in a first chamber (1a), which is a cylindrical space provided in the pump body (1). The electromagnetic suction intake valve (3) sucks fuel into a pressurizing chamber (11) formed by the first chamber (1a) and the plunger (2). The relief valve (4) opens if the fuel pressure on the downstream side of the pressurizing chamber (11) exceeds a set value, to return the fuel to the pressurizing chamber (11). The pump body (1) includes a second chamber (1b) in which the relief valve (4) is disposed, and a communicating hole (1e) providing communication between the first chamber (1a) and the second chamber (1b). The diameter of the communicating hole (1e) is the same as the diameter of the first chamber (1a).
Inventors:
USUI SATOSHI (JP)
YAMADA HIROYUKI (JP)
OGURA KIYOTAKA (JP)
YAMADA HIROYUKI (JP)
OGURA KIYOTAKA (JP)
Application Number:
PCT/JP2020/030844
Publication Date:
March 18, 2021
Filing Date:
August 14, 2020
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02M59/44; F02M59/46
Foreign References:
| JP2013036431A | 2013-02-21 | |||
| JP2019100190A | 2019-06-24 | |||
| JP2019002374A | 2019-01-10 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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