US 10,690,097 B2Granted

Electromagnetic valve

AssigneeHitachi Automotive Systems, Ltd.

InventorsMasashi Sugaya, Kiyotaka Ogura, Takao Miyake, Yoshihito Yasukawa

Life of this patent

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Abstract

Provided is an electromagnetic valve capable of stabilizing an injection amount even when injection is performed while an intermediate member continues to be displaced after valve closing and returns to a closed valve standby state. For that purpose, a valve body 303 opens or closes a flow path. A movable iron core 404 moves the valve body 303 in a valve opening direction using a magnetic attraction force. An intermediate member 414 forms a preliminary stroke gap (g1) between the movable iron core 404 and the valve body 303 in a closed valve state. A stopper portion 410c collides with the intermediate member 414 when the intermediate member 414 moves in a direction in which the preliminary stroke gap (g1) is reduced.

Claims8

Dependent claims

An electromagnetic valve, comprising:

a valve body configured to open and close a flow path;
a movable iron core configured to move the valve body in a valve opening direction using a magnetic attraction force;
an intermediate member configured to form a preliminary stroke gap (g1) between the movable iron core and the valve body in a closed valve state;
a stopper portion which collides with the intermediate member when the intermediate member moves in a direction in which the preliminary stroke gap (g1) is reduced,
the stopper portion and the intermediate member being disposed via a gap (g2) larger than the preliminary stroke gap (g1), and
the intermediate member being configured such that, after the movable iron core collides with the valve body, the intermediate member moves upward independently of the movable iron core and collides with the stopper portion;
a first spring member configured to energize the valve body in a valve closing direction;
a third spring member attached to the stopper portion or the valve body and configured to energize the intermediate member in a direction in which the preliminary stroke gap (g1) is increased;
and
a second spring member configured to energize the movable iron core in a valve opening direction,
wherein a spring force of the first spring member is larger than a spring force of the third spring member, and the spring force of the third spring member is larger than a spring force of the second spring member.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/754,499Filed 25 Jul 2016
Priority: JP 2015-16535725 Aug 2015
Published: US 2018/0252192 A16 Sep 2018
Granted: 23 Jun 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F02M 51/0685
Having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering…:…
F02M 51/06
Fuel-injection apparatus characterised by being operated electrically: injectors peculiar thereto with means directly operating the valve needle
F02M 51/0682
The armature having an elongated valve body attached thereto: the body being hollow and its interior communicating with the fuel flow
F02M 61/10
Having valves , e.g. having a plurality of valves in series: other injectors with elongated valve bodies, i.e. of needle-valve type