Fuel injection valve and method for assembling same
AssigneeHitachi Astemo, Ltd.
InventorsAkiyasu Miyamoto, Masashi Sugaya, Yasuo Namaizawa, Takuya Watai
Life of this patent
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Abstract
Provided is a fuel injection valve capable of stroking a valve body in two stages of large and small strokes and improving responsiveness of a valve opening operation. Therefore, a first mover 201 is attracted to a magnetic core 107. A second mover 202 is formed separately from the first mover 201, and is attracted to the magnetic core 107 on an inner diameter side of the first mover 201. A valve body 101 has a flange portion 101a on an upstream side of the second mover 202. A spacer 213 forms a gap (void g1) in an axial direction between the flange portion 101a and the second mover 202 in a valve closed state.
Claims14
A fuel injection valve comprising:
- a first mover that is attracted to a magnetic core, the first mover being configured to store kinetic energy therewithin;
- a second mover that is formed separately from the first mover, and is attracted to the magnetic core on an inner diameter side of the first mover;
- a valve body comprising a flange portion disposed above the second mover;
- a spacer disposed above the second mover, the spacer forming a gap in an axial direction between the flange portion and the second mover in a valve closed state, the spacer having a hole;
- a first spring that urges a sleeve of the valve body in a valve closing direction;
- and
- a second spring that is disposed between the sleeve and the spacer, and urges the spacer toward the flange portion,
- wherein a head of the valve body having the flange portion is configured to be inserted into the hole of the spacer, and
- wherein the first mover and the second mover are positioned upstream of the magnetic core, and a third spring is positioned downstream of the magnetic core, the third spring having a smaller urging force than an urging force of the second spring, the urging force of the second spring being smaller than an urging force of the first spring.
A method for assembling a fuel injection valve, comprising:
- a step of inserting a root of a valve body having a flange portion into a hole of a spacer, wherein the flange portion is disposed below the spacer;
- a step of inserting the root of the valve body into a second spring;
- a step of engaging a sleeve having a flange-like shape with the root of the valve body;
- a step of inserting an assembly including the valve body, the spacer, the spring, and the sleeve into a hole of a magnetic core;
- a step of inserting a first spring into the hole of the magnetic core;
- a step of engaging an adjuster pin with the hole of the magnetic core, wherein a third spring is arranged on a downstream side of the magnetic core, the third spring having a smaller urging force than an urging force of the second spring, the urging force of the second spring being smaller than an urging force of the first spring;
- a step of engaging a second mover around the valve body, the second mover disposed below the flange portion and the spacer;
- and
- a step of engaging a first mover around the valve body, the first mover disposed below the second mover.
Dependencies are inferred from the claim text.