JP2003056430A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve that can quickly stabilize oil tightness of a valve part upon valve closing. SOLUTION: The fuel injection valve comprises a valve body 29 and 14 having a guide hole 14d, 29d, etc., a plurality of nozzle holes 28 formed at a tip end of the guide hole, and a valve seat 29a upstream the nozzle holes 28; and a valve member 26 housed for reciprocating movement in the guide hole, provided with an abutting portion 26c capable of abutting on and separating from the valve seat 29a, and closed and opened by abutment and separation of the abutting portion 26c on and from the valve seat 29a. The abutting portion 26c is a crest portion C formed on an outer circumference of the valve member 26 capable of abutting on and separating from a conical slope forming the valve seat 29a, and the crest portion C has a round chamfer Rc capable of biting a foreign mater off if clogged with any.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve, and more particularly to a structure related to oil tightness of a valve portion.

[0002]

2. Description of the Related Art In a fuel injection valve, it is necessary to secure the oil tightness of a seal portion where a valve seat and a valve member come into contact with and separate from each other in order to accurately flow and shut off a fluid. For example, in a fuel injection valve used in an automobile internal combustion engine, when the fuel injection amount is adjusted by making the valve opening period variable, if the fuel flows into the combustion chamber when the valve is fully closed, the fuel may be incompletely burned. Since harmful substances such as hydrocarbons (HC) in exhaust gas increase and adversely affect the environment, it is necessary to minimize the amount of fuel leakage when the valve is fully closed.

As a fuel injection valve for performing such flow rate adjustment, for example, Japanese Patent Application Laid-Open No. 4-362272 discloses a so-called cone seat type valve structure.

According to Japanese Patent Laid-Open No. 4-362272,
The ridge portion of the truncated cone-shaped valve member comes into contact with and separates from the valve seat having the conical slope surface, so that the valve portion is opened and closed, thereby allowing the fluid to flow and shut off.

[0005]

In the conventional structure, when the valve portion is opened and closed, the valve member accommodated in the valve body having the valve seat so as to be able to reciprocate can move reciprocally in a state of being inclined to the valve seat. There is a nature. When the ridge of the truncated cone, which is the sealing part of the valve member, comes into contact with the valve seat when the valve is closed, the valve seat slides along the conical slope of the valve seat, and the valve seat is in its original seated position. Reach the seat section of. During this time, the leakage of the valve portion gradually decreases and stabilizes at the regular seating position.

For this reason, the ridge of the valve member slides on the uneven surface corresponding to the surface roughness, depending on manufacturing variations of the seal portions of the valve seat and the valve member, for example, the surface roughness of the conical slope of the valve seat. The so-called slipperiness may be deteriorated and the oil tightness may not be stabilized early.

The present invention has been made in consideration of such circumstances, and an object thereof is to provide a fuel injection valve capable of stabilizing the oil tightness of the valve portion at an early stage when the valve is closed.

[0008]

According to claim 1 of the present invention, a guide hole, a plurality of injection holes formed at the tip of the guide hole,
And a valve body having a valve seat on the upstream side of the injection hole, and a contact portion that is housed in the guide hole so as to be able to reciprocate and has contact with and separation from the valve seat. , Valve separation due to separation,
A valve member to be opened, and the contact portion is a ridge portion formed on the outer periphery of the valve member that contacts and separates from the conical slope forming the valve seat, and the foreign matter is caught in the ridge portion. Occasionally, an R chamfer capable of cutting off foreign matter is formed.

Generally, there is a slidable gap between the guide hole that allows the valve member to reciprocate and the valve member, so that the valve member housed in the guide hole differs from the valve seat. It may move back and forth in an axial orientation or tilted.

On the other hand, in the embodiment of the present invention, when the valve is closed, the ridge of the abutting portion that comes into contact with and separates from the valve seat is chamfered, so that the contact state of the ridge with the valve seat is Spherical contact due to R chamfering is possible instead of edge contact. For this reason, the contact portion can be smoothly slid along the conical slope valve seat, so that the contact portion capable of fully closing the valve and the valve seat can be quickly transitioned to the sealed state, and When foreign matter is caught between the seat and the valve seat, it is lower than the contact surface pressure due to edge contact, but since it has an R chamfered shape that has a contact surface pressure that can cut off the foreign matter, It is possible to prevent oil tightness due to jamming.

The size of the R chamfer is preferably in the range of 0.05 to 0.2 mm as described in claim 2 of the present invention.

As a result, regardless of the reciprocating state of the valve member, the contact state between the contact portion and the valve seat can be a spherical contact state, and the R chamfering function that can cut off foreign matter can be reliably ensured.

According to the third aspect of the present invention, the ridge of the outer periphery of the valve member is a truncated cone-shaped upper base circle or lower base circle formed in the valve member.

That is, it is suitable for a fuel injection valve having a valve portion structure including a so-called cone seat type valve member and a valve seat.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the fuel injection valve of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a schematic structure of a fuel injection valve according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration around the valve portion in FIG. FIG. 3 is a partial cross-sectional view showing a valve member that comes into contact with and separates from a valve seat, which is a main part of the present invention in FIG. FIG. 4 is a graph showing the influence of the R chamfer formed on the contact portion according to the present embodiment on the valve tight leakage stability. FIG. 5 is a graph showing the influence of the R chamfer formed on the contact portion according to the present embodiment on the foreign matter bite-cutting property.

(Schematic Structure of the Present Embodiment Applied to Fuel Injection Valve of Internal Combustion Engine) As shown in FIGS. 1 and 2, the fuel injection valve 1 is used for an internal combustion engine, particularly for a gasoline engine, It is attached to an intake pipe of an internal combustion engine and injects fuel to supply fuel to a combustion chamber of the internal combustion engine. The fuel injection valve 1 has a substantially cylindrical shape, and includes a valve body 29 as a valve portion B, a valve member (hereinafter referred to as a nozzle needle) 26, and a coil wound around a spool 30 as an electromagnetic drive portion S. 31, a cylindrical member 14 forming a magnetic circuit in which a magnetic flux generated by an electromagnetic force generated by energizing the coil 31 flows, an armature 25 axially movable by the attraction force of the magnetic flux, and a nozzle needle when the coil 31 is not energized. 26 is a valve body 29
And a compression spring 24 for urging the armature 25 toward the valve body so as to close the valve.

First, the valve body 29 as the valve portion B, the nozzle needle 26, etc. will be described below.

The valve body 29 is fixed to the inner wall of the cylindrical member 14 by welding. Specifically, as shown in FIG. 2, the valve body 29 can be press-fitted or inserted into the magnetic cylindrical portion 14c of the cylindrical member 14. This magnetic cylinder member 1
4c is inserted into the inner wall of the valve body 29, the magnetic cylindrical portion 14
Weld the entire circumference from the outer peripheral side of c.

On the inner peripheral side of the valve body 29, there is formed a valve seat 29a with which the nozzle needle 26 abuts and separates. More specifically, as shown in FIG. 2, a fuel passage for fuel to be injected into the internal combustion engine is formed on the inner peripheral side of the valve body 29, and the valve seat is disposed from the downstream side of the internal combustion engine side toward the upstream side of the fuel. Slope 29a, large-diameter cylindrical wall surface 29
b, a conical inclined surface 29c, a small-diameter cylindrical wall surface 29d slidably supporting the nozzle needle 26, and a conical inclined surface 29e are sequentially formed. This conical inclined surface, that is, the valve seat 29a
Are reduced in diameter in the fuel injection direction, and the nozzle needle 2 described later
The contact portion 26c of 6 contacts and separates from the contact portion 26c.
And the valve seat 29a are arranged so that they can be seated. As a result, so-called valve opening and closing can be performed as a valve portion that connects and disconnects the fuel to be injected. Further, the large-diameter cylindrical wall surface 29b forms a fuel reservoir hole, that is, a fuel reservoir chamber 29f surrounded by the nozzle needle 26, and the small-diameter cylindrical wall surface 29d forms a needle support hole for slidably supporting the nozzle needle 26. Is forming. The needle support hole formed by the small-diameter cylindrical wall surface 29d has a smaller diameter than the fuel reservoir hole formed by the large-diameter cylindrical wall surface 29b.
The conical slope surface 29e has a diameter that increases toward the upstream side of the fuel.

The valve seat 29a, the large-diameter cylindrical wall surface 29b,
Conical inclined surface 29c, small diameter cylindrical wall surface 29d, conical inclined surface 29
e forms a guide hole for accommodating the nozzle needle 26 together with the inner circumference of the cylindrical member 14 described later.

The nozzle needle 26 as a valve member is a bottomed cylindrical body made of stainless steel, and a tip end portion of the nozzle needle 26 is formed with a contact portion 26c capable of contacting with and separating from the valve seat 29a. ing. More specifically, as shown in FIG. 2, the nozzle needle 26 includes a small-diameter columnar portion 26d formed in a cylindrical shape having a smaller diameter at the tip portion, that is, the fuel injection side than the fuel upstream side, and the inner circumference of the valve body 29 (in detail. Is a large-diameter cylindrical body portion 26 slidably supported on a small-diameter cylindrical wall surface 29d).
The end surface on the fuel injection side of the small-diameter columnar portion 26d is chamfered to form a conical inclined surface, which constitutes the contact portion 26c. Thereby, the contact portion 26
The size of the diameter of c, that is, the sheet diameter, is determined by the small diameter cylindrical wall surface 29.
It is formed to be smaller than the diameter of the needle support hole of d.
It is possible to achieve both the ease of precision machining of the valve seat 29a with which the contact portion 26c abuts and separates, and the securing of the valve tightness when the valve seat 29a and the abutment portion 26c abut each other when the valve is fully closed. That is, since the seat diameter is smaller than the hole diameter of the needle supporting hole formed by the small-diameter cylindrical wall surface 29d of the valve body 29, for example, the small-diameter cylindrical wall surface 29d as the inner circumference of the valve body 29, the conical inclined surface 29c, and the large-diameter cylinder. After the wall surface 29b and the valve seat 29a are formed by cutting, the valve seat 2 is formed by inserting a blade from the fuel upstream side into the fuel reservoir chamber 29f to secure the valve tightness.
Precise processing of the sheet portion 9a can be easily performed.

On the other hand, the large-diameter columnar portion 26e is formed on the fuel upstream side of the nozzle needle 26, and is slightly larger than the inner diameter of the small-diameter cylindrical wall surface 29d so as to be slidably accommodated in the small-diameter cylindrical wall surface 29d of the valve body 29. It is formed in a cylindrical shape with a small outer diameter. As a result, a predetermined minute gap is formed between the outer peripheral wall surface of the large-diameter columnar portion 26e and the small-diameter cylindrical wall surface 29d so that they are in sliding contact with each other.

Most of the large-diameter columnar portion 26e is formed in a thin cylindrical shape, and as shown in FIG. 2, the inner peripheral wall surface 26a thereof has an internal passage 2 for the fuel flowing downstream of the fuel injection side.
6f is formed. The internal passage 26f is formed by punching the end surface of the large-diameter columnar portion 26e on the fuel upstream side, and the depth of the punching is the valve seat 29.
The depth is set so that the bottom portion of the nozzle needle 26 can withstand the impact generated when sitting on a.

As a result, it is possible to reduce the weight of the nozzle needle 26 and to secure the strength against the impact generated when the nozzle needle 26 abuts on the valve seat 29a.

Incidentally, on the downstream side of the internal passage of the large-diameter columnar portion 26e, to the valve seat 29a on the downstream side, that is, the fuel sump chamber 2
At least one outlet hole 26b so as to communicate with 9f.
Is provided.

The injection hole plate 28 is formed in a thin plate shape on the tip end side of the fuel injection valve 1, and has a plurality of injection holes 2 in the central portion.
8 is formed. This injection hole 28a determines the injection direction by the injection hole axis line, the injection hole arrangement, and the like, and measures the fuel injection amount injected from the injection hole by the opening area of the injection hole and the valve opening period of the valve portion by the electromagnetic drive unit described later. You can

Next, the coil 31 as the electromagnetic drive section S,
The cylindrical member 14, the armature 25, the compression spring 24, etc. will be described below. It should be noted that the electromagnetic drive unit S may be one that opens and closes the valve portion of the fuel injection valve 9 by energizing and de-energizing.

As shown in FIG. 1, the coil 31 is wound around the outer circumference of a resin spool 30.
A terminal 12 that is electrically connected is provided at one end of the terminal 1. The spool 30 is mounted on the outer periphery of the cylindrical member 14 described later, and the connector portion 16 is provided so as to project from the outer wall of the resin mold 13 formed on the outer periphery of the cylindrical member 14. The terminal 12 is embedded in the connector portion 16.

The cylindrical member 14 is a pipe material having a magnetic portion and a non-magnetic portion, and is made of, for example, a composite magnetic material. By heating a part of the cylindrical member 14 to make it non-magnetic, the cylindrical member 14 shown in FIG.
b and the magnetic cylinder portion 14a are formed in this order. In addition,
An armature housing hole 14e is provided on the inner circumference of the cylindrical member 14, and an armature 25 described later is housed near the boundary between the non-magnetic cylinder portion 14b and the magnetic cylinder portion 14c.

Further, as shown in FIG. 1, a magnetic member 23, a resin mold 15, and a magnetic member 18 are provided on the outer periphery of the cylindrical member 14 forming a magnetic circuit in which a magnetic flux due to an electromagnetic force generated by energizing the coil 31 flows. It is provided. For more information,
The magnetic member 23 covers the outer periphery of the coil 31, and the magnetic member 18 is provided on the fuel upstream side of the coil 31 so as to avoid the rib 17 in a fan shape, for example. Resin mold 15
Is formed on the outer periphery of the magnetic members 18 and 23 and is connected to the resin mold 13.

As a result, the magnetic flux generated by the electromagnetic force generated by energizing the coil 31 flows in the order of the magnetic cylinder portion 14a, the attraction member 22, which will be described later, the armature 25, which will be described later, the magnetic cylinder portion 14c, the magnetic member 23, and the magnetic member 18. It constitutes a flowing magnetic circuit.

The armature 25 is a stepped cylindrical body made of a ferromagnetic material such as magnetic stainless steel, and is fixed to the nozzle needle 26. As a result, the coil 31
When the coil is energized, the magnetic flux generated by the electromagnetic force generated in the coil 31 acts on the armature 25 via the suction member 22, so that the nozzle needle 26 as well as the armature 25.
Can be moved in the axial direction on the side of the suction member 22, that is, in the direction away from the valve seat 29a. The internal space 25e of the armature 25 is configured to communicate with the internal passage 26f of the nozzle needle 26.

The suction member 22 is a cylindrical body made of a ferromagnetic material such as magnetic stainless steel, and is fixed to the inner circumference of the cylindrical member 14 by press fitting or the like.

The biasing spring (hereinafter referred to as a compression spring) 24 is a spring seat which is a stepped portion which forms an end surface of the adjusting pipe 21 arranged on the inner circumference of the suction member 22 and an internal space 25e of the armature 25. 25
When the coil 31 is not energized by being sandwiched between c and c, the nozzle needle 26 fixed to the armature 25 abuts the valve body 29 (specifically, the abutting portion 2
The armature 25 is urged toward the valve body 29 side by a predetermined urging force so that the valve 6c is brought into contact with the valve seat 29a and the valve is closed.

The adjusting pipe 21 is press-fitted and fixed to the inner periphery of the suction member 22, and the biasing force of the compression spring 24 can be adjusted to a predetermined biasing force by the amount of press-fitting of the adjusting pipe 21.

A valve body 29 and an injection hole plate 28 are liquid-tightly housed on the fuel injection side of the cylindrical member 14. The injection hole plate 28 may be liquid-tightly welded to the valve body 29 so that the valve body 29 is liquid-tightly accommodated in the cylindrical member 14. On the other hand, a filter 11 as shown in FIG. 1 is attached above the cylindrical member 14, and this filter 11 can remove foreign matters contained in the fuel flowing from the fuel upstream of the fuel injection valve 1. is there.

Here, the cylindrical member 14 fixed to the valve body 29 in an oil-tight manner is a part of the valve body 29 because it forms a guide hole for accommodating the nozzle needle 26 together with the valve body 29.

Here, the fuel injection valve 1 having the above-mentioned structure
The operation of will be described below.

When the coil 31 of the electromagnetic drive section S is energized,
Electromagnetic force is generated in the coil 31. At this time, in the armature 25 and the suction member 22 which form the magnetic circuit, a suction force for sucking the armature 25 is generated in the suction portion 25. As a result, the nozzle needle 26 fixed to the armature 25 is separated from the valve seat 29a of the valve body 29. Therefore, the valve body 29 and the nozzle needle 26 are opened, and the fuel flowing from the upstream side of the fuel injection valve 1 passes through the armature accommodating hole 14e, the internal passage 26f, etc., and through the injection hole 28a to the internal combustion engine. Is jetted.

On the other hand, when the energization is stopped, the electromagnetic force generated in the coil 31 disappears, so that the suction force sucking the armature 25 toward the suction member 22 also disappears. Therefore, the compression spring 2 biasing the armature 25
4, the nozzle needle 26 is pressed in the direction of coming into contact with the valve seat 29a of the valve body 29. Therefore, the valve body 29 and the nozzle needle 26 are closed, and the fuel that flows out to the internal combustion engine by injection is shut off. At this time, the valve device is in a closed state (specifically, a sealing state when the contact portion 26c of the nozzle needle 26 and the valve seat 29c are in contact).
If the valve is closed, it is possible to accurately cut off the fuel outflow.

As a result, the fuel injection valve 9 is turned on during the energization period,
That is, the fuel injection amount injected into the internal combustion engine can be adjusted by making the valve opening period variable.

However, the structure of the fuel injection valve 1 described above generally has a nozzle needle 26 and a nozzle needle 2.
There is a slidable gap in the guide hole of the valve body 29 (specifically, the valve body 29 and the cylindrical member 14) that enables the reciprocating movement of the valve 6 (that is, in the present embodiment, the needle of the valve body 29). Small diameter cylindrical wall surface 29 as a support hole
And the nozzle needle 26 (specifically, the large diameter column large portion 26
e) A predetermined minute gap is formed so as to make sliding contact with the outer peripheral wall surface). For this reason, the nozzle needle 26 is attached to the valve seat 2
There is a possibility of reciprocating movement with respect to 9a in a state in which they are arranged in slightly different axial directions as shown in FIG. 6 or in a tilted state. At this time, as shown in FIG.
Even if 6c comes into contact with the conical slope 29a, it moves along the valve seat 29a in the valve closing direction to gradually close the valve (specifically, the leakage of the valve portion gradually decreases) while fully closing (valve tightness). (Note that the phenomenon of moving in the valve closing direction along the valve seat 29a will be referred to as slip hereinafter).

The valve seat 29a and the nozzle needle 2
6 (specifically, the contact portion 26c), the contact portion 26c slides on the uneven surface corresponding to the surface roughness of the conical slope surface 29a depending on the manufacturing variation, for example, the surface roughness of the conical slope surface 29a that is the valve seat. The so-called slipperiness may deteriorate, and the oil tightness may not be stable early when the valve is closed.

(Main parts of this embodiment and detailed description thereof)
In view of this, the embodiment of the present invention provides the fuel injection valve 1 having the following features so that the oil tightness of the valve portion can be stabilized early when the valve is closed.

First, the structure around the nozzle needle 26 that comes into contact with and separates from the valve seat 29a, which is the essential part of the embodiment of the present invention, and particularly around the contact portion 26c, will be described with reference to FIG.

As shown in FIG. 3, the contact portion 26c has a so-called cone-seat type valve portion structure having a truncated cone shape. In the cone seat type valve part structure, the seal part, in which the contact part 26c directly contacts the valve seat 29a to completely close the valve, is one of the two bottom circles 26cu and 26cd of the truncated cone.
Either of them may be a circle (hereinafter referred to as a ridge portion) C as a ridge line that makes edge contact with the valve seat 29a.

In the present embodiment, the upper bottom circle 26cu will be described as a ridge C as shown in FIG.

As shown in FIG. 3, the ridge portion C is formed with a minute R chamfer Rc described later.

That is, the contact state of the ridge Rc with the conical slope valve seat 29a is not edge contact but R chamfer R
A spherical contact due to c is possible. As a result, the contact portion 26c can be smoothly slid along the conical slope surface 29a via the ridge portion C having the R chamfer Rc, and therefore, when the valve is closed, the valve can be fully closed early. The contact state between the contact portion 26c and the valve seat 29a can be changed to a sealed state, so that the oil tightness at the time of valve closing can be stabilized early (see FIG. 4).

On the other hand, in the spherical contact state, the contact surface pressure exerted on the valve seat 29a of the ridge Rc is lower than in the edge contact state. Therefore, in the present embodiment, the oil tightness caused by the foreign matter being caught at the time of valve closing is prevented. To prevent this, even if foreign matter is caught between the contact portion 26c and the valve seat 29a and bites into it, the chamfer R has a contact surface pressure that is sufficient to bite off the foreign matter.
Size of c (hereinafter, referred to as upper limit allowable chamfer) Rcmax
Set as follows (see FIG. 5).

As a result, the R chamfering Rc is applied to the ridge C within a range not more than the upper limit allowable chamfering Rcmax for generating a contact surface pressure higher than the allowable contact surface pressure, so that the oil tightness at the time of valve closing can be stabilized early. Thus, it is possible to secure the so-called foreign matter bite-off property that prevents oil tightness due to foreign matter biting when the valve is closed.

Here, the contact portion 26c according to the present embodiment.
The experimental results of the effect of the R chamfer Rc formed on (the ridge C) in detail will be described below with reference to FIGS. 4 and 5.

As shown in the graph of FIG. 4 showing the early stability of oil tightness when the R chamfer Rc is closed, the time during which the leakage of the valve portion after the nozzle needle 26 is seated is stable depends on the size of the R chamfer Rc. Is significantly reduced as 0 becomes from 0 mm to 0.05 mm, and early stability of oil tightness is improved according to the size of the R chamfer Rc. On the other hand, the size of R chamfer Rc is 0.05 m
If it is m or more, the effect of reducing the time during which the leakage stabilizes depending on the size of the R chamfer Rc is insignificant. That is, the size of the R chamfer Rc formed on the contact portion 26c may be 0.05 mm or more from the viewpoint of improving early stability of oil tightness.

As shown in the graph of R chamfering Rc in FIG. 5 showing the foreign matter biting property, the size of the R chamfering Rc is 0.2 mm.
If it is less than
Equivalent to the foreign matter bite-cutting property in the edge contact state where the size of the R chamfer Rc is 0 mm). As the evaluation index of the foreign matter biting property, it was confirmed by measuring the so-called internal foreign matter residual frequency for determining whether or not the foreign matter inside the fuel injection valve could be discharged without the foreign matter being caught.

Therefore, the size of the R chamfer Rc is 0.
By setting it to be in the range of 05 to 0.2 mm,
Regardless of the reciprocating state of the nozzle needle 26, the contact state between the contact portion 26c and the valve seat 29a is changed to the spherical contact state,
Therefore, the oil tightness of the valve portion can be stabilized at an early stage, and the function of the R chamfering capable of cutting off the foreign matter can be reliably ensured.

Here, if the nozzle needle 26 described in this embodiment is made lighter (specifically, the large-diameter column large portion 26e is made into a thin cylindrical body), the responsiveness of the on-off valve is improved.
The early stability of oil tightness can be further improved. Even if the nozzle needle 26 is solid and well-known, the effect of the R chamfer Rc according to the present embodiment can be similarly obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a fuel injection valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration around a valve section in FIG.

FIG. 3 is a partial cross-sectional view showing a configuration around a valve member that comes into contact with and separates from a valve seat, which is a main part of the present invention in FIG.

FIG. 4 is a graph showing the influence of R chamfering formed on the contact portion according to the present embodiment on the valve tight leakage stability.

FIG. 5 is a graph showing the influence of R chamfering formed on the contact portion according to this embodiment on the foreign matter bite-cutting property.

FIG. 6 is a schematic diagram for explaining slippage until a contact portion is seated on the valve seat and the valve is fully closed when the valve member reciprocates along the valve seat.

[Explanation of symbols]

1 Fuel Injection Valve 11 Filter 14 Cylindrical Member (Part of Valve Body) 14d Inner Circumference (Part of Guide Hole of Valve Body) 25 Armature 26 Nozzle Needle (Valve Member) 26c Abutting Parts 26cu, 26cd Frustum-shaped upper base circle and lower base circle 26e Large-diameter columnar body (thin cylindrical body) 28, 28a Injection hole plate, injection hole 29 Valve body 29a Valve seat 29b, 29c, 29d, 29e As guide hole Each of the large-diameter cylindrical wall surface, the conical slope surface, the small-diameter cylindrical wall surface (needle support hole), the conical slope surface 31 C coil B valve section S electromagnetic drive section C ridge section Rc ridge section C

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3G066 AA01 AB02 BA31 BA36 CC05U                       CC11 CC14 CC26 CD10 CD30                       CE22

Claims (3)

[Claims] 1. A guide hole, a plurality of injection holes formed at the tip of the guide hole, and a valve body having a valve seat upstream of the injection hole; and a reciprocally housed in the guide hole, A valve member that has a contact portion that can contact and separate from the valve seat, and that is closed and opened by contact and separation of the valve seat and the corresponding contact portion; and the contact portion, A ridge portion formed on the outer periphery of the valve member that comes into contact with and separates from a conical slope forming a valve seat, and the ridge portion is formed with an R chamfer capable of cutting off a foreign substance when it is caught. A fuel injection valve characterized by the above. 2. The size of the R chamfer is 0.05 to
The fuel injection valve according to claim 1, wherein the fuel injection valve is in a range of 0.2 mm. 3. The ridge of the outer periphery of the valve member is a truncated cone-shaped upper base circle or lower base circle formed in the valve member. Fuel injection valve.