Title:
FUEL INJECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/079361
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a structure that facilitates stabilization of injection quantity even when injection intervals become shorter in a fuel injection device which is able to shorten the time that a valve element takes to move a distance necessary to open a nozzle hole upon receipt of an impact force from a movable iron core during valve opening. In order to achieve this purpose, the fuel injection device according to the present invention is provided with: a valve element that opens and closes a flow channel; a movable iron core that moves the valve element in a valve-opening direction by means of magnetic attraction; an intermediate member that is configured to form a preliminary stroke gap (g1) between the movable iron core and the valve element in a closed valve state; a spring for the movable iron core for biasing the movable iron core in a valve opening direction; and a spring for the intermediate member for biasing the intermediate member in a valve closing direction, wherein the spring forces of the spring for the movable iron core and the spring for the intermediate member are configured such that the movement distance of the intermediate member when the iron core impinges on the intermediate member after the valve element is closed is less than the preliminary stroke gap (g1).
Inventors:
SUGAYA MASASHI (JP)
MIYAMOTO AKIYASU (JP)
OGURA KIYOTAKA (JP)
MIYAKE TAKAO (JP)
IIZUKA TAKATOSHI (JP)
MIYAMOTO AKIYASU (JP)
OGURA KIYOTAKA (JP)
MIYAKE TAKAO (JP)
IIZUKA TAKATOSHI (JP)
Application Number:
PCT/JP2017/037628
Publication Date:
May 03, 2018
Filing Date:
October 18, 2017
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02M51/06; F16K31/06; F16K31/10
Domestic Patent References:
| WO2016042896A1 | 2016-03-24 |
Foreign References:
| JP2015224596A | 2015-12-14 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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