JPH1130167A - Fuel injection nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable injection of fuel from an injection hole in the constant direction as well as to enable adjustment of the opening of the injection hole. SOLUTION: An opening and closing member 13 to be fitted to a taper hole part 5d is arranged on the taper hole part 5d on the lower part of a valve seat 5e. The opening and closing member 13 is so formed that the diameter may be extended or contracted by its elastic deformation. The opening and closing member 13 is connected to a needle valve 10, displaced in the vertical direction with seating of the needle valve 10 and the lift movement, and the diameter of the opening and closing member 13 is extended or contracted. Cutout parts 13d extending in the vertical direction are formed in parts facing injection holes 5f of each opening and closing member 13. The width of the cutout part 13d is changed according to the extension or contraction of the diameter of the opening and closing member 13, the width is zero when the needle valve 10 is seated, and the diameter is made larger than the inside diameter of each injection hole 5f when the needle valve 10 is lifted to the maximum extent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection nozzle capable of changing a fuel flow area of an entire injection hole.

[0002]

2. Description of the Related Art Generally, in a fuel injection nozzle, an injection hole has a constant inner diameter, and a fuel flow area is unchanged. Therefore, when the fuel supply rate of the fuel pumped from the fuel injection pump to the fuel injection nozzle is high, such as when the engine is rotating at a high speed, the pressure of the fuel increases, and the fuel injected from the injection hole is increased. And the fuel is atomized. However, when the oil supply rate is low, such as when the engine is rotating at low speed, the fuel pressure is relatively low. Therefore, there is a problem that the penetration force of the fuel is small and the fuel is not atomized.

Therefore, recently, various fuel injection nozzles that can change the flow area of the injection hole have been proposed. As such a fuel injection nozzle, one in which a part of the plurality of injection holes is closed or all the openings are opened to change the flow area (Japanese Patent Application Laid-Open No. 59-180063; Japanese Unexamined Patent Publication No. 4-76266), an injection hole having a large inside diameter and an injection hole having a small inside diameter are formed, and one of them is closed and the other is opened to change the flow area ( Japanese Unexamined Utility Model Publication No. 7-30366) and a device in which the flow area is changed by closing a part of the opening of the injection hole (see Japanese Patent Application Laid-Open No. 62-85168).

[0004]

With the former two fuel injection nozzles, the flow area can be changed only in a stepwise manner (usually in two steps). For this reason, there has been a problem that the penetration force and the atomization of the fuel injected from the injection hole cannot be accurately controlled. On the other hand, in the latter fuel injection nozzle, the opening of the injection hole is opened and closed only from one side thereof, so that the fuel injection direction changes according to the degree of opening and closing, and the fuel injection direction is fixed. There was a problem that fuel could not be injected.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a valve seat that divides the inside into an upstream side and a downstream side of fuel, and a valve seat downstream of the valve seat. A fuel injection nozzle comprising: a nozzle body having an injection hole opened on an inner surface; a valve body seated and lifted on the valve seat; and seating means for seating the valve body on the valve seat. An opening / closing member that is displaced by a displacement member and that opens and closes an opening inside the injection hole from both sides thereof in accordance with the displacement position is provided displaceably inside the nozzle body on the further downstream side. I have.

In this case, a nozzle spring for urging the valve body toward the valve seat may be used as the seating means.
Alternatively, a piezoelectric element that expands and contracts in the moving direction of the valve body according to the magnitude of the applied voltage may be used.

The opening / closing member may be provided on the nozzle body so as to be displaceable in the axial direction of the valve body, or may be provided so as to be rotatable about the axis of the valve body.

The opening and closing member may be connected to the valve body so as to be integrally displaced therewith, and the valve body may also be used as the displacement means.

[0009] The displacement means penetrates the valve body movably in the axial direction thereof, and has a shaft body connected to the opening and closing member at one end, and a shaft body connected to the other end of the shaft body. An actuator for displacing the valve body in the axial direction may be provided. Alternatively, the valve body may be rotatably penetrated in the axial direction, and the opening and closing member may be connected to one end of the valve body. An actuator connected to the end and rotating the shaft body may be constituted.

[0010] On the inner surface of the nozzle body where the injection hole is opened, a tapered hole portion whose axis is aligned with the valve body and whose diameter increases toward the valve seat side is formed.
It is formed in a tapered cylindrical shape so as to be fitted in the tapered hole portion, and is formed so as to be able to expand and contract in diameter. The cutout portion becomes substantially equal to or larger than the inner diameter of the injection hole, and when the diameter is reduced, both sides approach each other to form a cutout portion that is narrower than the inner diameter of the injection hole. The fuel that has flowed to the downstream side through the gap between the seat and the seat may flow into the injection hole through the cutout portion.

It is desirable that the width of the notch is made zero when the diameter of the opening / closing member is reduced, so that the opening / closing member closes the entire injection hole.

A straight hole having an axis aligned with the valve body is formed on the inner surface of the nozzle body where the injection hole opens, and the opening and closing member is slidably fitted in the straight hole in the axial direction. The opening / closing member formed as a cylindrical body has a peripheral wall portion facing the injection hole.
An elongated hole extending in the axial direction and having a width equal to or larger than the inner diameter of the injection hole at one end and narrower than the inner diameter of the injection hole at the other end may be formed.

[0013] On the inner surface of the nozzle body where the injection hole opens, a straight hole portion whose axis is aligned with the valve body is formed, and the opening / closing member is rotatably fitted in the straight hole. Formed on the peripheral wall portion of the opening / closing member which is a cylindrical body facing the injection hole, extends in the circumferential direction, and has a width equal to or more than the inner diameter of the injection hole at one end, and at the other end. An elongated hole smaller than the inner diameter of the injection hole may be formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIGS. 1 to 3 show a first embodiment of the present invention. As shown in FIG. 2, a fuel injection nozzle A of this embodiment has a nozzle body 1. The nozzle body 1 includes a nozzle holder 2 having an axial shape, and a nozzle body 5 fixed to a lower end surface of the nozzle holder 2 by a nozzle nut 3 via a spacer 4.

Inside the nozzle holder 2, a shaft receiving hole 2a extending downward from the upper end surface and a spring receiving hole 2b extending from the bottom surface of the shaft receiving hole 2a to the lower end surface of the nozzle holder 2 are formed. I have. The adjusting shaft 6 is inserted into the shaft receiving hole 2a. The upper end of the adjusting shaft 6 is screwed to the upper end of the shaft receiving hole 2a, and is fixed to the nozzle holder 2 by a nut 7. Therefore, the position of the adjusting shaft 6 can be adjusted in the vertical direction by loosening the nut 7 and adjusting the amount of screwing into the nozzle holder 2. On the other hand, a nozzle spring (seating means) 8 is housed in the spring housing hole 2b. The upper end of the nozzle spring 8 abuts on the lower end surface of the adjusting shaft 6 via the shim 9, and by adjusting the position of the adjusting shaft 6 in the vertical direction, the urging force of the nozzle spring 8 can be adjusted. I can do it.

In the inside of the nozzle body 5, a guide hole 5a, a fuel pool 5
b, a passage hole 5c, and a tapered hole portion 5d (see FIG. 1) whose diameter is reduced downward are sequentially formed. Guide hole 5
A needle valve (valve element) 10 is slidably inserted into a. A protrusion 10a is formed on the upper end surface of the needle valve 10. The projection 10a penetrates through the spacer 4 and projects into the spring receiving hole 2b.
1 and abuts against the lower end of the nozzle spring 8.
Therefore, the needle valve 10 is urged downward by the nozzle spring 8. The lower end of the needle valve 10 has a fuel reservoir 5b.
As shown in FIG. 1, the lower end of the needle valve 10 that has reached the tapered hole 5 d has a tapered shape that is tapered downward. A valve portion 10b is formed. The taper angle of the valve portion 10b is slightly smaller than the taper angle of the tapered hole portion 5d, and the lower edge 10c of the valve portion 10b is seated on the inner surface of the intermediate portion of the tapered hole portion 5d by the nozzle spring 8. I have. Tapered hole portion 5 on which lower edge 10c of valve portion 10b is seated
The inner surface of d is a valve seat 5e.

The fuel pressurized by a fuel injection pump (not shown) is fed to the fuel reservoir 5b through a fuel passage 12 formed over the nozzle holder 2, the spacer 4, and the nozzle body 5. Fuel pool 5b
Is passed downward between the outer peripheral surface of the needle valve 10 and the inner peripheral surface of the passage hole 5c. Here, the needle valve 10 is seated on the valve seat 5e by the urging force of the nozzle spring 8 until the fuel pressure reaches the predetermined valve opening pressure, so that the outer peripheral surface of the needle valve 10 and the passage hole 5c are closed. The fuel that has passed between the inner peripheral surface and the inner peripheral surface cannot flow into the tapered hole portion 5d (downstream side) below the valve seat 5e and stays upstream from the valve seat 5e. On the other hand, when the fuel pressure becomes equal to or higher than the predetermined valve opening pressure, the needle valve 10 is lifted from the valve seat 5e. Then, fuel flows between the valve portion 10b of the needle valve 10 and the inner peripheral surface of the tapered hole portion 5e and flows into the tapered hole portion 5d below the valve seat 5e. Note that the maximum lift amount of the needle valve 10 is regulated by the upper end surface of the needle valve 10 abutting on the spacer 4.

As shown in FIG. 1, a plurality of (five in this embodiment) injection holes 5f are formed at the lower end of the nozzle body 5 so as to penetrate the peripheral wall. Each injection hole 5f
Are located at the same position in the vertical direction, and
It is arranged so as to be located radially with respect to the axis d. Each injection hole 5f is opened on the inner peripheral surface of the tapered hole portion 5d, which is also lower than the valve seat 5e. Therefore, when the needle valve 10 is lifted from the valve seat 5e, each injection hole 5
When fuel is injected from f and the needle valve 10 subsequently sits on the valve seat 5e, fuel injection ends.

An opening / closing member 13 is arranged in the tapered hole 5d below (downstream) from the valve seat 5e so as to face the injection hole 5f. The opening / closing member 13 is connected to the needle valve 10 as described later, and moves up and down integrally with the needle valve 10.

As shown in FIG. 3, the opening / closing member 13 is made of a metal such as spring steel, and is formed in a truncated conical cylindrical shape. The taper angle of the outer peripheral surface of the opening / closing member 13 is the same as the taper angle of the tapered hole 5d. Moreover, the radius of curvature of each portion of the outer peripheral surface of the opening / closing member 13 in the axial direction is the same as the radius of curvature of each portion of the inner peripheral surface of the tapered hole portion 5d facing the opening / closing member 13 when the needle valve 10 is seated. I have. Therefore, when the needle valve 10 is seated on the valve seat 5e, the opening / closing member 13 fits tightly on the inner peripheral surface of the tapered hole 5d.

On the upper part of the peripheral wall of the opening / closing member 13,
This portion is depressed inward, so that a depressed wall portion 13 a having a triangular cross section extending in the up-down direction is formed in the injection hole 5.
f, and a groove 13b is formed by both side surfaces of each depressed wall portion 13a. Each depressed wall 13a
Are arranged at the same position as the above-mentioned injection hole 5f in the circumferential direction, and always above the injection hole 5f in the vertical direction. The width of the depressed wall portion 13a, that is, the width of the groove 13b, can be changed to be wide and narrow by the elastically bent portion 13c inside the depressed wall portion 13a. It is possible.

The outer diameter of each part of the opening / closing member 13 is, in a natural state where no force acts on the opening / closing member 13, each part of the tapered hole 5 d facing the opening / closing member 13 when the needle valve 10 is lifted to the maximum. Is larger than the inner diameter of Therefore, the opening / closing member 13 is always in a state where the diameter is reduced.
d is pressed against the inner peripheral surface, and when moved (displaced) in the up-down direction, the diameter is increased or decreased according to the displacement position by the elastic force of the bent portion 13c. In particular, when the needle valve 10 is seated on the valve seat 5e, the diameter is reduced until both side surfaces of the groove 13b are in close contact with each other.

A notch 13d extending vertically is formed in the peripheral wall of the opening / closing member 13 following the depression 13a. The notch 13d always faces the injection hole 5f regardless of the position of the opening / closing member 13, that is, the needle valve 10 faces the injection hole 5f at the upper end when the needle valve 10 is seated. Is arranged so as to face the injection hole 5f at the lower end when the vehicle is lifted. The width of the notch portion 13d changes in a wide and narrow manner according to the diameter of the opening / closing member 13. That is, when the needle valve 10 is lifted to the maximum and the opening / closing member 13 is expanded to the maximum diameter, it expands to the inner diameter of the injection hole 5f or more, and the injection hole 5f
Open the entire opening inside the. When the needle valve 10 is seated and the opening / closing member 13 is gradually reduced in diameter, the width of the notch 13d is correspondingly reduced. As a result, of the peripheral wall of the opening / closing member 13, two locations circumferentially adjacent to the notch 13d open the opening of the injection hole 5f from both sides thereof (both sides in the circumferential direction of the tapered hole 5d). Gradually close up. When the needle valve 10 is seated, the notch 13d
Are in contact with each other, and the width of the notch 13d becomes zero. Therefore, the opening / closing member 13 closes the entire opening inside the injection hole 5f.

The opening / closing member 13 is connected to the needle valve 10 as follows.
Is connected to the lower end. That is, as shown in FIG. 1, a connection projection 10d is formed on the lower end surface of the needle valve 10. The connection protrusion 10d is inserted into the opening / closing member 13 from its upper end. Also, on the outer peripheral surface of the connection protrusion 10d, the same number of the protrusions 10e as the number of the recessed wall portions 13a are formed so as to enter between two adjacent recessed wall portions 13a. Then, each of the ridges 10e is in contact with the depressed wall 13a, 13
The opening / closing member 13 is connected to the needle valve 10 in a non-rotatable manner by entering the space between a and a. A flange 10f is provided at the tip of the projection 10d. The recessed wall portion 13a enters between the flange portion 10f and the lower end surface of the needle valve 10, whereby the opening / closing member 13 is connected to the needle valve 10 so as to move integrally. In addition, it is a matter of course that the ridge 10e and the flange 10f do not hinder free opening and closing of the opening / closing member 13.

In the fuel injection nozzle A having the above-described structure, when fuel is fed from the fuel injection pump and the needle valve 10 is lifted, the opening / closing member 13 is expanded in diameter and the notch 13d is opened. As a result, the fuel passes through the gap between the connection protrusion 10d and the inner peripheral surface of the opening / closing member 13 and the groove 13c, and the notch 1
It reaches 3d, from which it flows into the injection hole 5f and is injected outside.

Here, the opening of the injection hole 5f depends on the notch 1
Since the width of 3d changes according to the lift amount of the needle valve 10, it is small when the lift amount is small, and increases as the lift amount increases. Therefore, when the pressure of the fuel pumped from the fuel injection pump is low, such as when the engine is rotating at low speed, the lift of the needle valve 10 is small and the opening of the injection hole 5f is also small. Therefore, even if the pressure is low, the fuel is injected vigorously from the injection holes 5f, the penetration force of the fuel is increased, and the fuel is atomized. On the other hand, when the pressure of the fuel to be pumped is high, such as when the engine is rotating at high speed, the needle valve 10 is lifted to the maximum.
The injection hole 5f is fully opened. Therefore, the fuel is injected into the injection hole 5
The fuel is sufficiently injected from f. In addition, the opening degree of the injection hole 5f changes continuously and continuously according to the lift amount of the needle valve 10, so that the penetration force and atomization of the fuel are accurately adjusted.

Adjacent portions of the peripheral wall of the opening / closing member 13 on both sides of the notch 13d open and close the injection hole 5f by the same amount from both sides, and open and close only from one side. Not like that. Therefore, the fuel injected from the injection hole 5f is always injected in a substantially constant direction along the axis of the injection hole 5f regardless of the opening degree of the injection hole 5f.

Further, in this embodiment, when the needle valve 10 is seated, the opening / closing member 13 closes the entire injection hole 5f. Therefore, after the needle valve 10 is seated, the injection hole 5f
, The so-called backward dripping phenomenon can be prevented. Further, since the opening and closing member 13 is displaced by the needle valve 10, there is no need to separately provide a means for displacing the opening and closing member 13. Therefore, the manufacturing cost can be reduced accordingly. Further, since the opening and closing member 13 can be manufactured by press-forming a material having a cylindrical or conical shape, for example, the manufacturing cost can be reduced.

Next, another embodiment of the present invention will be described. In the following embodiments, only configurations different from those in the above embodiment will be described, and similar components will be denoted by the same reference numerals and description thereof will be omitted.

FIG. 4 shows a second embodiment of the present invention. In the fuel injection nozzle B of this embodiment, a piezoelectric element (seating means) 21 is used instead of the nozzle spring 8.
Is used. The upper end of the piezoelectric element 21 abuts on the adjustment shaft 6 via the electrode 22, and the lower end of the piezoelectric element 21 faces the projection 10 a of the needle valve 10 via the electrode 23. Moreover, when a predetermined maximum voltage is applied, the piezoelectric element 21 is extended and the needle valve 10 is seated on the valve seat 5e. In other words, if the voltage applied to the piezoelectric element 21 is reduced from the maximum voltage and reduced, the needle valve 10 can be lifted by the reduced amount, whereby the lift amount of the needle valve 10 is regulated. . Of course, by setting the applied voltage to zero, the maximum lift of the needle valve 10 is regulated. The timing of applying a voltage between the electrodes 22 and 23 is controlled by a microcomputer (not shown) based on the engine speed, load, and the like.

In the fuel injection nozzle B having the above structure,
The lift amount of the needle valve 10 can be arbitrarily and accurately controlled by the voltage applied between the electrodes 22 and 23, and the opening / closing member 13 can be accurately adjusted to a desired position. Therefore, the opening degree of the injection hole 5f can be accurately adjusted to a desired size regardless of the fuel pressure.

FIGS. 5 and 6 show a third embodiment of the present invention. In the fuel injection nozzle C of this embodiment, the opening / closing member 13 is separated from the needle valve 10, and The position of the member 13 in the vertical direction is adjusted by the displacement means 30.

That is, the displacement means 30 has the shaft 31. The shaft 31 is inserted through the adjustment shaft 6 shim 9, the nozzle spring 8, the spring receiver 11, and the needle valve 10 so as to be relatively movable in the up-down direction. The upper end of the shaft body 31 is
Are connected to a stepping motor (actuator) 33 via the. Therefore, the stepping motor 33
Is rotated, the rotation is changed to linear movement by the conversion mechanism 32, and the shaft 31 moves (displaces) in the vertical direction. The lower end of the shaft body 31 is connected to the opening / closing member 13 so as not to be movable in the vertical direction and to be unable to rotate. Therefore, when the stepping motor 33 is rotated in the forward and reverse directions, the opening / closing member 13 moves in the vertical direction by an amount corresponding to the rotation direction and the rotation amount.

In the fuel injection nozzle C having the above structure,
The opening / closing member 13 is separated from the needle valve 10 and the displacement means 30
Since the position of the opening / closing member 13 is adjusted, the opening degree of the injection hole 5f can be adjusted regardless of the lift amount of the needle valve 10.

FIGS. 7 and 8 show a fourth embodiment of the present invention. In this embodiment, a cylindrical opening / closing member 43 is used in place of the opening / closing member 13. That is, inside the lower end of the nozzle body 5,
A straight hole 5g following the tapered hole 5d is formed concentrically with the tapered hole 5d, and an injection hole 5f is opened on the inner peripheral surface of the straight hole 5g. An opening / closing member 43 is slidably inserted into the straight hole 5g.

As shown in FIG. 8, the opening / closing member 43 has a cylindrical shape, and has a bottom portion 43a at an upper end thereof. An insertion hole 43b is formed at the center of the bottom 43a. Then, the shaft 31 is inserted into the insertion hole 43b, and the opening / closing member 43 is
Are integrally connected to each other. In addition, a hole 43c for allowing fuel to flow into the opening / closing member 43 is formed in the bottom 43a.

An elongate hole 43d extending in the vertical direction is formed in the peripheral wall of the opening / closing member 43. This long hole 43d is
The same number (four in this embodiment) as the number of the injection holes 5f is formed, and they are arranged at the same position in the circumferential direction as the injection holes 5f. Moreover, the width of the long hole 43d is equal to or larger than the inner diameter of the injection hole 5f at the lower end thereof, and smaller than the inner diameter of the injection hole 5f at the upper end thereof. Therefore, the opening and closing member 43 is moved in the vertical direction,
When the lower end of 3d faces the injection hole 5f, the injection hole 5f
When the entirety is opened and the upper end of the elongated hole 43d is opposed to the injection hole 5f, both side portions of the injection hole 5f are closed by the peripheral wall portions circumferentially adjacent to the elongated hole 43d.

FIG. 9 shows an opening / closing member 43 'used in the fifth embodiment of the present invention.
Instead of 3d, a long hole 43e extending in the circumferential direction is formed. The long hole 43e is arranged at the same position in the vertical direction as the injection hole 5f. Moreover, the width of the long hole 43e is equal to or larger than the inner diameter of the injection hole 5f at one end in the circumferential direction, and is smaller than the inner diameter of the injection hole 5f at the other end. Therefore, when the opening / closing member 43 'is rotated in the circumferential direction and one end of the long hole 43e is opposed to the ejection hole 5f, the entire ejection hole 5f is opened, and the other end of the long hole 43e is opposed to the ejection hole 5f. Then, both side portions of the injection hole 5f are closed by the peripheral wall portion vertically adjacent to the long hole 43e.

The shaft 31 connected to the opening / closing member 43 'is directly connected to the stepping motor 33 (see FIG. 5) and a speed reduction mechanism instead of the conversion mechanism 32 in order to rotationally displace the opening / closing member 43'. (Not shown).

[0040]

As described above, according to the first to twelfth aspects of the present invention, not only the opening degree of the injection hole can be changed, but also the injection direction of the fuel injected from the injection hole. Can be made substantially constant regardless of the opening degree. According to the third aspect of the invention, an effect is obtained that the lift amount of the valve body can be controlled irrespective of the pressure of the fuel fed to the fuel injection nozzle. According to the invention of claim 6, since the valve body is also used as a displacement means of the opening / closing member, it is not necessary to separately provide a displacement means, and the fuel injection nozzle can be reduced in size by that much, and the manufacturing can be performed. The effect that cost can be reduced is obtained. According to the invention according to claim 7 or 8, since the opening / closing member can be displaced independently of the valve body by the displacement means, the opening degree of the injection hole can be adjusted regardless of the lift amount of the valve body. The effect is obtained. According to the ninth aspect of the present invention, the opening and closing member can be press-formed, and the effect of being able to manufacture it at low cost is obtained. Further, according to the tenth aspect of the present invention, an effect is obtained that a fuel sagging phenomenon can be prevented.

[Brief description of the drawings]

1 is a view showing a first embodiment of the present invention, wherein FIG. 1 (A) is an enlarged view of an X circle portion of FIG. 2 in a state where a needle valve is seated, and FIG. 1 (B) is Figure 1 with the needle valve lifted
1 (A), FIG. 1 (C) is a sectional view taken along the line CC of FIG. 1 (A), and FIG. 1 (D) is a sectional view taken along the line DD of FIG. 1 (B).

FIG. 2 is a longitudinal sectional view showing the overall configuration of the embodiment.

FIG. 3 is a perspective view showing an opening / closing member used in the embodiment.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 6 is a cross-sectional view similar to FIG. 1C, showing a main part of the embodiment.

FIG. 7 is a diagram showing a main part of a fourth embodiment of the present invention;
It is sectional drawing similar to (C).

FIG. 8 is a perspective view showing an opening / closing member used in the embodiment.

FIG. 9 is a perspective view showing an opening / closing member used in a fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List A Fuel injection nozzle B Fuel injection nozzle C Fuel injection nozzle 1 Nozzle body 5d Tapered hole 5e Valve seat 5f Injection hole 8 Nozzle spring 10 Needle valve (valve) 13 Opening / closing member 13d Notch 30 Displacement means 31 Shaft 33 Stepping Motor (actuator) 43 opening / closing member 43 'opening / closing member 43c long hole 43d long hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 51/06 F02M 51/06 N 61/04 61/04 A 61/10 61/10 D

Claims (12)

[Claims] A valve body for dividing the interior into an upstream side and a downstream side of a fuel; a nozzle body having an injection hole opened on an inner surface downstream of the valve seat; A valve body, and a seating means for seating the valve body on the valve seat, wherein the displacement member is displaced by a displacement member into the nozzle body downstream of the valve seat. A fuel injection nozzle characterized in that an opening / closing member for opening / closing an opening inside the injection hole from both sides thereof is displaceably provided in accordance with the condition. 2. The seating means according to claim 1, wherein the seating means is a nozzle spring for urging the valve body toward the valve seat.
3. The fuel injection nozzle according to 1. 3. The fuel injection nozzle according to claim 1, wherein the seating means is a piezoelectric element that expands and contracts in a direction in which the valve element moves in accordance with the magnitude of the applied voltage. 4. The fuel injection nozzle according to claim 1, wherein the opening / closing member is provided on the nozzle body so as to be displaceable in an axial direction of the valve body. 5. The fuel injection nozzle according to claim 1, wherein the opening / closing member is provided on the nozzle body so as to be rotatable about an axis of the valve body. 6. The fuel according to claim 4, wherein the opening / closing member is connected to the valve body so as to be displaced integrally therewith, and the valve body is also used as the displacement means. Injection nozzle. 7. The shaft means, wherein the displacement means penetrates the valve body movably in the axial direction thereof, and has one end connected to the opening and closing member, and the other end of the shaft body connected to the shaft. 5. The fuel injection nozzle according to claim 4, further comprising an actuator for displacing the body in the axial direction. 8. The shaft means, wherein the displacement means penetrates through the valve body so as to be rotatable in the axial direction, and is connected to one end of the shaft body and the other end of the shaft body. The fuel injection nozzle according to claim 5, further comprising an actuator for rotating and displacing the shaft body. 9. An inner surface of the nozzle body in which the injection hole is opened, a tapered hole portion which is aligned with the valve body and has an enlarged diameter toward the valve seat side is formed. It is formed in a tapered cylindrical shape so as to fit into the tapered hole portion, and is formed so as to be capable of expanding and contracting, and the outer circumferential surface of the opening and closing member facing the injection hole has a circumferential width when the opening and closing member is expanded. When the diameter is reduced, both side portions approach each other to form a notch portion which is narrower than the inner diameter of the injection hole, and the notch portion is formed from the upstream side. 9. The fuel injection nozzle according to claim 6, wherein the fuel that has flowed into the downstream side through a gap between the seat and the seat flows into the injection hole through the notch. 9. 10. The fuel injection nozzle according to claim 9, wherein the opening / closing member closes the entire injection hole when the width of the notch becomes zero when the diameter of the opening / closing member is reduced. 11. A straight hole having an axis aligned with the valve body is formed on an inner surface of the nozzle body where the injection hole opens, and the opening / closing member is slidable in the straight hole in the axial direction. Formed as a cylindrical body that fits
A peripheral wall portion of the opening / closing member which is formed as a cylindrical body and facing the injection hole extends in the axial direction, and has a width equal to or more than the inner diameter of the injection hole at one end, and the width of the injection hole at the other end. 8. The fuel injection nozzle according to claim 6, wherein an elongated hole smaller than an inner diameter is formed. 12. A straight hole having an axis aligned with the valve body is formed on an inner surface of the nozzle body where the injection hole opens, and the opening / closing member is rotatably fitted to the straight hole. Formed as a cylindrical body, a peripheral wall portion of the tubular opening / closing member facing the injection hole extends in the circumferential direction, and has a width equal to or more than the inner diameter of the injection hole at one end and the other end. 9. The fuel injection nozzle according to claim 8, wherein an elongated hole smaller than the inner diameter of the injection hole is formed on the side.