JP2001300360A - Fluid injection nozzle and fluid injection valve provided with the fluid injection nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid injection nozzle for promoting the atomization of a fluid and a fluid injection valve provided with the fluid injection nozzle. SOLUTION: A fuel injection nozzle 5 is provided in the main body of a fuel injection valve for injecting fuel from an injection port 3b when opened. A nozzle hole 5a consisting of an inlet hole 51a, a long hole 52a and an outlet hole 53a is furnished to stepwise control the flow direction of the fuel injected from the injection port 3b. The long hole 52a with its one end communicating with the outlet hole 53a is extended in the direction crossing the axis of the nozzle. The inlet hole 51a is communicated to the other end of the long hole 52a. The outlet hole 53a makes an acute angle with the long hole 52a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid injection nozzle for controlling a flow direction of a fluid injected from an injection port of a fluid injection valve body and a fluid injection valve provided with the fluid injection nozzle. A typical example of the fluid injection valve is a fuel injection valve that injects and supplies fuel to an engine for a vehicle (also referred to as an internal combustion engine).

[0002]

2. Description of the Related Art Some conventional fuel injection nozzles are disclosed, for example, in Japanese Patent Laid-Open Publication No. Hei 10-200998. The fuel injection nozzle disclosed in the patent publication will be described with reference to FIGS. 27 and 28. FIG. 27 is a sectional view of the periphery of the fuel injection nozzle, and FIG.
FIG. 2 is a partially broken plan view of a fuel injection nozzle. As shown in FIG. 27, the fuel injection valve main body 101 includes a valve seat 103 provided with a valve seat 103a and an injection port 103b on an inner wall surface forming a fuel passage, and a contact portion 104a capable of contacting the valve seat 103a. And a valve 104 having the same.

The fuel injector main body 101 injects fuel from an injection port 103b of the valve seat 103 when the contact portion 104a of the valve 104 is separated from the valve seat 103a of the valve seat 103 (so-called valve opening). Further, the fuel injection is shut off by the contact portion 104a of the valve 104 abutting on the valve seat 103a of the valve seat 103 (so-called valve closing).

[0004] The fuel injection nozzle 105 includes two upper and lower plate members 151 and 153. Upper plate 15
Numeral 1 is arranged on the downstream side of the valve seat 103 (the lower side in FIG. 27). The upper plate member 151 has eight inlet holes 151a penetrating in the plate thickness direction (see FIG. 28).

As shown in FIG. 27, the lower plate 1
The valve seat 103 is arranged so as to overlap the downstream side (the lower side in FIG. 27) of the upper plate member 151.
Mounted on The lower plate member 153 has a concave surface 153b on the fuel upstream side. The concave surface 153b is
A substantially disk-shaped fuel chamber 155 is formed between the upper plate 151 and the surface on the fuel downstream side. The lower plate member 153 has four outlet holes 1 penetrating in the plate thickness direction.
53a (see FIG. 28).

In the above-described fuel injection nozzle 105, the fuel injected from the injection port 103 b of the valve seat 103 by opening the fuel injection valve main body 101 is supplied to the upper plate member 1.
51, through the fuel chamber 155 through the inlet hole 151a,
It is ejected through the outlet hole 153a. In addition, the inlet hole 151a of the upper plate member 151 and the fuel chamber 155
The outlet hole 153a of the lower plate member 153 corresponds to the "hole for controlling the flow direction of the fuel in a stepwise manner" in this specification, and the "injection hole of the fuel injection nozzle" in this specification. Is formed.

[0007]

According to the conventional fuel injection nozzle 105, in the fuel chamber 155, the fuel flowing through the inlet hole 151a of the upper plate member 151 is supplied to the concave surface 153b of the lower plate member 153. A lateral flow along is formed. Thereby, the fuel chamber 1
In the vicinity of the center portion of the fuel cell 55, a collision between the fuel flows occurs, and the fuel flow is disturbed. Therefore, the momentum of the fuel flowing from the fuel chamber 155 to the outlet hole 153a is reduced, and the atomization of the fuel is not sufficient.

[0008] There is a conventional fluid injection nozzle in which a fuel chamber is divided so as not to cause collision between fuel flows (for example, German Patent Application Publication (DE).
197 03 200 In A1, FIG3, FIG4
reference). However, the outlet hole is at a right angle to the divided fuel chamber. Therefore, the effect of removing the fuel is small, and the atomization of the fuel cannot be said to be sufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fluid ejection nozzle capable of promoting the atomization of a fluid and a fluid ejection nozzle for the fluid ejection nozzle. To provide a fluid injection valve provided with the same.

[0010]

According to a first aspect of the present invention, there is provided a fluid ejecting nozzle having a configuration according to the first aspect of the present invention. The “hole” in this specification refers to a hole having a function of controlling the flow direction of a fluid, and does not include a hole having no function. In addition, the “hole on the inlet side” in this specification refers to a hole on the upstream side of the long hole, and not only a hole that directly communicates the inlet hole with the long hole, but also a long hole. Including those in which the inlet holes communicate indirectly. Further, as used herein, "the exit hole has an acute angle with respect to the long hole" means that the hole itself of the long hole and the hole itself of the exit hole form an acute angle, and the exit from the long hole has an acute angle. A sharp edge is formed inside the flow of fuel to the hole.

With this configuration, the fluid injected from the injection port by opening the fluid injection valve main body passes through three or more stages of holes including the inlet hole and the outlet hole of the injection hole to flow in the flow direction. Is ejected after being controlled step by step. Thus, the fluid that has flowed into the long hole portion flows through the long hole portion, so that the flow of the fluid becomes a lateral flow having directivity. Furthermore, since the outlet hole forms an acute angle with the long hole, when the directional lateral flow of the fluid flows from the long hole to the outlet hole, the effect of separating the fluid increases. Is done. Therefore, atomization of the fluid can be promoted by the synergistic effect of obtaining the directional flow of the fluid in the lateral direction and increasing the separation effect on the directional fluid. .

According to a second aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the second aspect of the present invention. With such a configuration, a hole on the inlet side communicating with the elongated hole with respect to the outlet hole is disposed at the center of the nozzle (for example, the above-mentioned German Patent Application Publication (DE)).
197 03 200 A1, see FIG. 3 and FIG. 4)), and the outlet hole can be more compactly arranged at the center of the nozzle.

According to a third aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the fourth aspect of the present invention. With this configuration, an injection hole having three or more holes can be easily formed by stacking three or more plate members.

According to a fourth aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the fifth aspect of the present invention. With this configuration, it is possible to reduce the number of parts by eliminating the separate member, compared to a case where the hole of the injection hole is formed in a member different from the member forming the injection port of the fluid injection valve body. it can. The member forming the injection port of the fluid injection valve body is not limited to a single-stage hole, but includes a member having a plurality of stages of holes.

According to a fifth aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the third aspect of the present invention. According to this structure, the number of holes having a small number of holes among the communicating holes of the injection holes is reduced, so that the productivity of the members can be improved.

According to a sixth aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the sixth aspect of the present invention. With such a configuration, even when the assembly of the member having the long hole portion and the member having the outlet hole portion varies, the outlet hole portion having the hole diameter φd can be made to correspond to the hole width W of the long hole portion. it can. Therefore, it is possible to reduce the variation in the flow rate caused by the variation in the assembly.

According to a seventh aspect of the present invention, there is provided a fluid ejecting nozzle having the configuration described in the seventh aspect of the present invention. With this configuration, it is possible to prevent the fuel flowing from the long hole into the outlet hole from wrapping around the edge of the outlet hole, and to further increase the effect of separating the fluid.

An eighth aspect of the present invention is a fluid jet nozzle having the constitution described in the eighth aspect of the present invention. With this configuration, even if the assembly of the member having the long hole portion and the member having the outlet hole portion varies, the effective length L of the fixed width of the outlet hole portion with respect to the maximum width Wa of the long hole portion.
Can be made to correspond. Therefore, it is possible to reduce the variation in the flow rate caused by the variation in the assembly. In addition, the maximum width Wa of the long hole is the hole width of the long hole when there is one long hole communicating with the outlet hole,
When the number of the long holes communicating with the outlet hole is two, the hole width includes two long holes, and when the number of the long holes communicating with the outlet hole is three, three long holes are used. Includes the hole width.

According to a ninth aspect of the present invention, there is provided a fluid injection valve having a configuration according to the ninth aspect of the present invention.
With such a configuration, it is possible to provide a fluid injection valve including a fluid injection nozzle capable of promoting atomization of a fluid.

[0020]

[Embodiment 1] Embodiment 1 will be described. FIG. 1 is a front cross-sectional view showing the periphery of the fluid ejection nozzle. As shown in FIG. 1, a fuel injection valve main body 1, which is a main component of the fuel injection valve, includes a valve body 2, a valve seat 3, and a valve 4 as main components.

The valve body 2 is formed in a substantially cylindrical shape, and has a valve seat 3 built in a tip portion (a lower end portion in FIG. 1). The valve seat 3 has an annular valve seat 3a formed on an inner wall surface forming a fuel passage, and a circular injection port 3b formed below the valve seat 3a.
have. The valve 4 is formed of a needle valve, and is fitted into the valve seat 3. The valve 4 has a spherical contact portion 4a that can contact the valve seat 3a. For example, the valve body 2 is made of stainless steel having magnetism, and the valve seat 3 and the valve 4 are made of stainless steel.

The valve 4 interrupts the injection of fuel from the injection port 3b of the valve seat 3 by opening and closing in the axial direction (vertical direction in FIG. 1). That is, when the contact portion 4a of the valve 4 separates from the valve seat 3a of the valve seat 3 (so-called valve opening), fuel is injected from the injection port 3b of the valve seat 3. The fuel injection is stopped by the contact portion 4a of the valve 4 contacting the valve seat 3a of the valve seat 3 (so-called valve closing). Since the fuel injection valve body 1 has almost the same configuration as a well-known one,
A detailed description thereof will be omitted.

A fuel injection nozzle 5 for atomizing the fuel injected from the injection port 3b is disposed downstream of the valve seat 3 (lower side in FIG. 1). FIG. 2 is a partially enlarged view of FIG. In the present specification, the one provided with the fuel injection nozzle 5 in the fuel injection valve main body 1 corresponds to a fuel injection valve.

As shown in FIG. 2, the fuel injection nozzle 5
Three stainless steel plate members 51, 5 in a laminated state
2,53. For convenience of explanation, the plate material 51 on the upstream side is a first plate material,
2 is the second plate material, and the downstream plate material 53 is the third plate material.
Of the plate material. In addition, each plate material 51,5
2 and 53 are each formed in a disk shape.

The three plate members 51, 52, 53 are stacked in a stacked manner. On the outer periphery of the fuel injection nozzle 5,
As shown in FIG. 1, the fitting piece 5b bent upward.
Are formed. The fitting piece 5b is fitted to the lower end (the lower end in FIG. 1) of the valve seat 3. A first plate member 51 is provided on the lower end surface of the valve seat 3.
Faced.

As shown in FIG. 1, a substantially ring-shaped stainless steel plate holder 54 is disposed on the lower end surface of the third plate member 53. The plate holder 54 has a substantially L-shaped cross section. One piece 54a of the plate holder 54 is attached to the valve seat 3 by, for example, laser welding with the three plate members 51, 52, 53 therebetween.
The one piece 54b of the plate holder 54 is bent downward in FIG. 1 from the outer periphery of the one piece 54a, and is attached to the valve body 2 by, for example, laser welding.

The fuel injection nozzle 5 is shown in FIG.
As shown in FIG. The injection hole 5a controls the flow direction of the fuel injected from the injection port 3b of the fuel injection valve main body 1 in a stepwise manner, and is configured as described below.

The injection hole 5a of the fuel injection nozzle 5 has an inlet hole 51a formed in the first plate member 51, an elongated hole portion 52a formed in the second plate member 52, and a third plate member. 53 and an outlet hole 53a formed in the outlet 53. FIG. 3 is an enlarged view of a main part of FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG.
6 is a partial plan view of the first plate member 51, FIG. 6 is a partial plan view of the second plate member 52, and FIG.
3 is a partial plan view. In addition, the long hole 52a of the second plate member 52 corresponds to "a hole having one end communicating with the outlet hole" in this specification. In addition, the entrance hole 51a of the first plate member 51 corresponds to the “entrance-side hole” in this specification.

The first plate member 51 will be described. In FIG. 5, a total of ten inlet holes 51a are arranged in the first plate member 51 in two rows on the left and right where four inlet holes 51a are arranged at predetermined intervals in the vertical direction, and one on each of the left and right ends. ing. The entrance hole 51a has a circular shape and penetrates the first plate member 51 in the thickness direction (see FIG. 3). Further, the inlet hole 51a is arranged so as to fit within the injection port 3b (see FIG. 1). In addition, as shown in FIG. 5, the inlet holes 51a located at the left and right ends are formed so as to be inscribed in the plane on the inner peripheral surface of the injection port 3b. Also,
The inlet holes 51a located at the upper and lower ends of the two rows on the left and right are formed slightly away from the inner peripheral surface of the injection port 3b in a plane.

Next, the second plate member 52 will be described.
In FIG. 6, a second plate member 52 has a long hole 52
a are arranged in a total of ten similarly to the inlet hole 51a. The elongated hole portion 52a is formed in a substantially elongated shape extending in a direction intersecting the nozzle axis L1 (see FIG. 1), for example, substantially in the horizontal direction in FIG. 5, and penetrates the second plate member 52 in the plate thickness direction. (See FIG. 3). The long holes 52a located in the two rows on the left and right are each inclined toward the center of the nozzle. The outer end 52b of the long hole 52a
The inner end 52c is formed in a substantially arc shape. The outer end 52b of each of the long holes 52a communicates with each of the inlet holes 51a of the first plate member 51 (see FIGS. 3 and 4). The outer end 52b of the long hole 52a corresponds to the upstream end, and the inner end 52c corresponds to the downstream end.

Next, the third plate member 53 will be described.
In FIG. 7, the third plate member 53 has an outlet hole 5
A total of ten 3a are arranged similarly to the entrance hole 51a and the long hole 52a. The outlet hole 53a is formed in a circular shape, and penetrates the third plate member 53 in the plate thickness direction (see FIG. 3). In addition, the outlet hole 53a is formed as shown in FIG.
As shown in FIG. 3, the nozzle is inclined at a tilt angle θ1 of, for example, 40 ° in a direction away from the nozzle axis L1 toward the downstream of the fuel ejection direction (downward in FIG. 3). Each of the outlet holes 53a communicates with the inner end 52c of the elongated hole 52a in the second plate member 52 (see FIGS. 3 and 4).

Further, as described above, the outlet hole 53a is inclined at an inclination angle θ1 with respect to the nozzle axis L1 (see FIG. 3). As a result, the outlet hole 53a forms an acute angle with the elongated hole 52a, and has a substantially folded shape. Further, as shown in the sectional view of FIG.
The inclination angle θ2 (in the case of this example, 90 ° −θ1) is provided inside the flow of fuel from the fuel cell 2a to the outlet hole 53a (see the arrow in FIG. 3).
(= 50 °). In addition,
The inclination angle θ2 of the edge portion 53b may be an acute angle, that is, an angle smaller than a right angle.

The entrance hole 51a of the first plate member 51, the long hole portion 52a of the second plate member 52, the third
The exit holes 53a of the plate members 53 are formed by pressing the respective plate members 51, 52, 53. The thickness of the third plate member 53 is
Exit holes 5 required to give directionality to the injected fuel
It is set to a size that allows the length of 3a to be earned. The plate thickness of each of the plate members 51, 52, 53 is set, for example, to be the same.

Further, the elongated hole 52a and the outlet hole 53a
Are formed with the following dimensional relationship. FIG. 8 is a plan view of a main part of the fuel injection nozzle, and FIG. 9 is a sectional view taken along line IX-IX of FIG. 8 and 9, the long hole 5
The hole width W of 2a (corresponding to twice the radius R of the inner end portion 52c) and the hole diameter φd of the outlet hole portion 53a are set to values satisfying the following condition: WT ≧ φd W ≦ 3φd. Here, T is a tolerance (not shown) of variation between the plate materials due to the assembling of the second plate material 52 and the third plate material 53.

The diameter φd1 of the inlet hole 51a (FIG. 9)
Is set to a value that satisfies the condition of φd1-T ≧ W.

The offset S between the inlet hole 51a and the outlet hole 53a is set, for example, based on the characteristic diagram of FIG. In FIG. 10, the horizontal axis represents the entrance hole 5.
The offset amount S (mm) between 1a and the outlet hole 53a is shown, and the vertical axis shows the spray particle size SMD (μm). FIG.
0, the dotted line represents the spray particle size SMD (μ
m), and the solid line summarizes the experimental results of the spray particle size SMD (μm) according to the present embodiment. As is clear from FIG. 10, if the offset amount S is too small, the spray particle size SMD becomes large, and becomes constant at a predetermined value or more.

In the present embodiment, the fuel injection valve provided with the fuel injection nozzle 5 is mounted on the engine such that the upper side of the nozzle axis L1 (see FIG. 1) faces upward. When mounted on the engine in this manner, the fuel vapor can easily escape upward from the injection hole 5a of the fuel injection nozzle 5, so that the performance of the fuel injection valve with respect to high temperatures can be improved.

According to the fuel injection nozzle 5 described above, the fuel injected from the injection port 3b by opening the fuel injection valve body 1 flows through the three-stage holes 51a, 52a, 53a of the injection hole 5a. After the direction is controlled stepwise (see the arrow in FIG. 3), it is ejected (see the two-dot chain line F in FIG. 3).

When the fuel that has flowed into the long hole 52a flows through the long hole 52a, the flow of the fuel is directed in a lateral direction (see the arrow in FIG. 8).
It is said. Further, the outlet hole 53a is formed with respect to the long hole 52a.
Has an acute angle, so that when the directional lateral flow of the fuel flows from the long hole 52a to the outlet hole 53a, the effect of separating fuel is increased (see FIG. (See dotted chain line F1). The separation effect on fuel is
This is provided by the edge 53b located inside the fuel flow. Therefore, the atomization of the fuel can be promoted by the synergistic effect of obtaining a directional flow of the fuel in the lateral direction and increasing the separation effect on the directional fuel. . Experiments have confirmed that the fuel injection nozzle 5 of the present embodiment has a spray particle size smaller by about 30 to 35% than the conventional fuel injection nozzle. In FIG. 8, the arrow with the symbol Y is
A state is shown in which part of the fuel flowing from the long hole 52a to the outlet hole 53a wraps around the periphery of the outlet hole 53a.

As described above, since the atomization of the fuel injected from the injection hole 5a of the fuel injection nozzle 5 is promoted, the fuel is easily mixed with air over a wide range, and the combustion efficiency of the fuel is increased. As a result, the amount of harmful substances and fuel consumed in exhaust gas can be reduced.

Further, an outlet hole 53a is arranged at the center of the nozzle with respect to the hole on the inlet side of the elongated hole 52a, that is, the inlet hole 51a. Thereby, when the inlet hole 51a is arranged on the center side of the nozzle with respect to the outlet hole 53a (for example, the above-mentioned German Patent Application Publication DE 197
03 200 A1, see fig3 and fig4))
As compared with, the outlet hole 53a can be more compactly arranged at the center of the nozzle.

The injection hole 5a is formed by stacking three plate members 51, 52, 53 having respective holes 51a, 52a, 53a. Thus, the injection holes 5a having the three-stage holes 51a, 52a, 53a can be easily formed by stacking the three plate members 51, 52, 53.

Further, the elongated holes 52 which are communicated with each other by assembling the second plate member 52 and the third plate member 53 are provided.
a and the outlet hole 53a, when the tolerance of the variation between the plate materials is T, the hole width W of the long hole 52a and the hole diameter φd of the outlet hole 53a satisfy the condition of W−T ≧ φd Is set to a value. Thereby, the second plate member 52 having the long hole portion 52a and the outlet hole portion 53 are formed.
The outlet hole 53a having the hole diameter φd can be made to correspond to the hole width W of the long hole 52a even if the assembling with the third plate member 53 having a varies. Therefore, it is possible to reduce the variation in the flow rate caused by the variation in the assembly.

FIG. 11 is a characteristic diagram showing the relationship between the ratio (W / φd) of the hole diameter φd of the outlet hole portion 53a to the hole width W of the long hole portion 52a and the spray particle diameter. FIG.
In FIG. 1, the horizontal axis represents the ratio (W / φd), and the vertical axis represents the spray particle size SMD (μm). As is clear from FIG. 11, as the ratio (W / φd) approaches 1 (W = d), the atomized particle diameter SMD (μm) becomes smaller and the atomization becomes better. However, since it is difficult to set W1 = d2 due to the accuracy of assembling the second plate member 52 and the third plate member 53, by setting the ratio (WT / φd) close to 1, the fuel It is good to aim at atomization of.

The fuel injection valve has a fuel injection nozzle 5. Thereby, it is possible to provide a fuel injection valve including the fuel injection nozzle 5 that can promote atomization of fuel.

[Second Embodiment] A second embodiment will be described with reference to FIGS. FIG. 12 shows the fuel injection nozzle 5
FIG. 13 is a partial bottom view of the valve seat 3. The second embodiment is a partial modification of the first embodiment, so that the modified portion will be described in detail, and substantially the same portions as those in the first embodiment will be denoted by the same reference numerals and redundant description will be omitted. I do.

As shown in FIG. 12, in the second embodiment, the end face of the member forming the injection port 3b of the fuel injection valve main body 1 (ie, the valve seat 3) on the downstream side of the injection port 3b (the lower end in FIG. 12). An end plate 3c is integrally formed on the end face). Then, an inlet hole 51a is formed in the end plate 3c (see FIG. 13). As shown in FIG. 12, the second plate member 52 and the third plate member 53 are formed on the valve seat 3 in the same manner as in the first embodiment in a state where the second plate member 52 is in contact with the valve seat 3. Attached to.

With the above configuration, the valve seat 3
The first plate member 51 is eliminated and the component is removed as compared with the case where the inlet hole portion 51a is formed in another member (see the first plate member 51 in the first embodiment) (see the first embodiment). Points can be reduced.

Third Embodiment A third embodiment will be described with reference to FIGS. FIG. 14 shows the fuel injection nozzle 5
15 is a partial bottom view of the valve seat 3. FIG. In the third embodiment, a part of the second embodiment is modified. Therefore, the modified part will be described in detail, and substantially the same parts as those in the second embodiment will be denoted by the same reference numerals and redundant description will be omitted. I do.

As shown in FIG. 14, in the third embodiment,
With respect to the end plate portion 3c of the fuel injection valve body 1, the inlet hole portion 51a
In addition, a long hole 52a is integrally formed (see FIG. 15). As shown in FIG. 14, the third plate member 53 is attached to the valve seat 3 in a state where the third plate member 53 is in contact with the valve seat 3 as in the second embodiment.

With this configuration, a member separate from the valve seat 3 (the first plate member 5 in the first embodiment).
1 and the second plate member 52).
The first plate member 51 and the second plate member 52 can be eliminated and the number of parts can be reduced as compared with the case where the a and the long hole 52a are formed (see Embodiment 1).

[Fourth Embodiment] A fourth embodiment will be described with reference to FIG. FIG. 16 is a partial sectional view of the fuel injection nozzle 5 corresponding to FIG. Embodiment 4 is based on Embodiment 1
Are partially changed, the changed portions will be described in detail, and the same reference numerals will be assigned to substantially the same portions as in the first embodiment, and redundant description will be omitted.

As shown in FIG. 16, in the fourth embodiment,
The four inlet holes 51a (see FIG. 4) in two rows on the left and right sides of the first plate member 51 of the first embodiment are elongated narrow inlet holes (reference numerals, 51A) is formed on the plate member 51. That is, each of the inlet holes 51A is connected to two long holes 52a in the second plate member 52, respectively.

With such a configuration, the number of the inlet holes 51A and the number of the long holes 52a communicating with each other of the injection holes 5a are different from each other.
Since the number of holes perforated to the first plate member 51 having 1a) is reduced, the productivity of the plate member 51 can be improved. Note that this embodiment is described in Embodiment 2
When applied to (see FIG. 12), the productivity of the valve seat 3 can be improved. In addition, three or more long holes 52a can be communicated with one inlet hole.

[Fifth Embodiment] A fifth embodiment will be described. FIG. 17 is a partial sectional view of the fuel injection nozzle 5 corresponding to FIG. 4, and FIG. 18 is a partial plan view of the third plate member 53. In the fifth embodiment, a part of the first embodiment is modified. Therefore, the modified part will be described in detail, and substantially the same parts as those in the first embodiment will be denoted by the same reference numerals and redundant description will be omitted. I do.

As shown in FIG. 17, in the fifth embodiment,
A total of four outlet holes 53a (see FIG. 4) in two rows on the left and right sides of the third plate member 53 of the first embodiment are long and narrow outlet holes (reference numerals, see FIG. 4). 53A) is formed on the plate member 53 (see FIG. 18).
reference). That is, two long holes 52a in the second plate member 52 are respectively connected to the outlet holes 53A. The outlet holes 53A and 53a are
It has a constant width Wb in a direction intersecting the long hole 52a.

With this configuration, since the number of the outlet holes 53A and the number of the long holes 52a communicating with each other of the injection holes 5a are different from each other, a small number of outlet holes (53A, 5A) are provided.
Since the number of holes formed in the third plate member 53 having 3a) is reduced, the productivity of the plate member 53 can be improved.

Further, the outlet holes 53A and 53a are
It has a constant width Wb in the direction intersecting with 2a. As a result, the elongate hole 52a moves from the outlet hole 53A, 5
It is possible to prevent the fuel flowing through 3a from wrapping around the edge of the outlet hole 53a (see arrow Y in FIG. 8), and it is possible to further increase the fuel separation effect.

Further, the elongated hole 52a and the outlet hole 53a
Are formed with the following dimensional relationship. FIG. 19 is a plan view of a main part of the fuel injection nozzle, and FIG. 20 is a view XX-X of FIG.
It is an X-ray sectional view. 19 and 20, the maximum width Wa (= W) of the long hole 52a and the effective length L of the constant width Wb of the outlet hole 53a are set to values that satisfy the condition of Wa ≦ L + Ta. Here, Ta is a tolerance (not shown) of variation between the plate materials due to the assembling of the second plate material 52 and the third plate material 53.

Similarly, the long hole 52a and the outlet hole 53A
Are formed with the following dimensional relationship. 17 and 18, the maximum width of the long hole 52a (exit hole 53
The maximum width Wa including the two long hole portions 52a communicating with A) and the effective length L of the constant width Wb of the outlet hole portion 53A are set to values satisfying the condition of Wa ≦ L + Ta.

With this configuration, even if the assembling of the second plate member 52 and the third plate member 53 varies, the outlet hole 53 has a maximum width Wa of the long hole 52a.
A, 53a can correspond to the portion of the effective length L of the constant width Wb. Therefore, it is possible to reduce the variation in the flow rate caused by the variation in the assembly. According to experiments, the fuel injection nozzle 5 of the present embodiment has a spray particle diameter of 20 to 20 times larger than that of the fuel injection nozzle of the first embodiment.
It was confirmed that it was about 30% smaller.

[Embodiment 6] FIG.
This will be described with reference to FIG. FIG. 21 is a partial sectional view of the fuel injection nozzle 5 corresponding to FIG. 4, and FIG.
3 is a partial plan view of FIG. The sixth embodiment is different from the fifth embodiment.
Are partially modified, the modified parts will be described in detail, and substantially the same parts as in the fifth embodiment will be denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 21, in the sixth embodiment,
A total of four outlet holes 53a in two rows on the left and right sides of the third plate member 53 of the fifth embodiment (see FIG. 17) are elongated ones that are vertically continuous. 53B) (see FIG. 22).
reference). As shown in FIG. 21, each outlet hole 53B has:
Four long holes 52a in each row of the second plate member 52 communicate with each other. Also, the outlet hole 53B
And 53a have a constant width Wb in a direction intersecting the long hole 52a.

Further, similarly to the fifth embodiment, the long hole 52
21 and FIG. 22, the maximum width Wa of the long hole portion 52a (the maximum width including two long hole portions 52a communicating with the outlet hole portion 53B) Wa and the outlet hole portion 53B, as shown in FIGS. 53
The effective length L of the constant width Wb of A is set to a value that satisfies the condition of Wa ≦ L + Ta. In addition, Ta is a tolerance (not shown) of variation between the plate materials due to the assembling of the second plate material 52 and the third plate material 53.

[Seventh Embodiment] A seventh embodiment will be described with reference to FIGS.
This will be described with reference to FIG. 23 is a partial plan view of the fuel injection nozzle 5, FIG. 24 is a partial plan view of the first plate member 51, FIG. 25 is a partial plan view of the second plate member, and FIG. 26 is a portion of the third plate member 53. It is a top view. In the seventh embodiment, a part of the fourth embodiment (see FIG. 16) is modified. Therefore, the modified part will be described in detail, and substantially the same parts as in the fourth embodiment will be denoted by the same reference numerals. Duplicate description will be omitted.

As shown in FIG. 23, in the seventh embodiment,
The left and right five inlet holes 51a of the first plate member 51 of the fourth embodiment (see FIG. 16) are continuous elliptical inlet holes (symbols) that are curved one by one in each row. , 5
1B) (see FIG. 24). Further, as shown in FIG. 23, each of the inlet holes 51B is connected to five long holes 52a (see FIG. 25) in the second plate member 52, respectively. Note that a third plate member 53 is provided in each long hole 52a.
The respective outlet holes 53a (see FIG. 26) communicate with each other. Further, by forming the inlet hole 51B, the position and inclination of the long hole 52a of the second plate member 52 and the position of the outlet hole 53a of the third plate member 53 are slightly changed ( 25 and 26).

The present invention is not limited to the above embodiment, but can be modified without departing from the spirit of the present invention. For example, the present invention is not limited to fuel, and can be applied as the fuel injection nozzle 5 and the fuel injection valve for other fuels. Further, two holes communicating with each other in one plate material, for example, an inlet hole 51a and a long hole 5
2a, or the long hole 52a and the outlet hole 53a may be formed simultaneously. Further, in order to form an injection hole having three or more holes, a plate material having a hole is used, but the injection hole can be formed without using a plate material. Further, in the above-described embodiment, the injection hole 5a is formed by three-stage holes 51a, 52a, and 53a, but the injection hole 5a may be formed by four or more stages of holes. Further, the numbers and shapes of the inlet holes 51a, the long holes 52a, and the outlet holes 53a are not limited to those in the above-described embodiment, but can be changed as appropriate. In the above-described embodiment, the outlet hole 53a is arranged at the center of the nozzle with respect to the inlet 51a communicating with the long hole 52a. However, the inlet 51a is arranged at the center of the nozzle with respect to the outlet 53a. When the first plate 51 is disposed, the first plate 51 can be eliminated by forming the inlet hole 51a by the overlapping relationship between the long hole 52a of the second plate member 52 and the injection port 3b of the valve seat 3. it can.

[0068]

According to the fluid injection nozzle of the present invention and the fluid injection valve provided with the fluid injection nozzle, it is possible to obtain a directional flow of the fluid and a fluid having the directivity. Due to the synergistic action with the increase of the peeling effect on the fluid, atomization of the fluid can be promoted.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a peripheral portion of a fluid ejection nozzle according to a first embodiment.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a partial plan view of a first plate member.

FIG. 6 is a partial plan view of a second plate member.

FIG. 7 is a partial plan view of a third plate member.

FIG. 8 is a plan view of a main part of a fuel injection nozzle.

9 is a sectional view taken along line IX-IX of FIG.

FIG. 10 is a characteristic diagram showing a relationship between an offset amount S between an inlet hole and an outlet hole and a spray particle diameter.

FIG. 11 shows a hole diameter φd of an outlet hole with respect to a hole width W of a long hole.
FIG. 4 is a characteristic diagram showing a relationship between a ratio (W / φd) and a spray particle diameter.

FIG. 12 is a partial sectional view of a fluid ejection nozzle according to a second embodiment.

FIG. 13 is a partial bottom view of the valve seat.

FIG. 14 is a partial sectional view of a fluid ejection nozzle according to a third embodiment.

FIG. 15 is a partial bottom view of the valve seat.

FIG. 16 is a partial sectional view corresponding to FIG. 4 of a fluid ejection nozzle according to a fourth embodiment.

FIG. 17 is a partial cross-sectional view corresponding to FIG. 4 of a fluid ejection nozzle according to a fifth embodiment.

FIG. 18 is a partial plan view of a third plate member.

FIG. 19 is a plan view of a main part of a fuel injection nozzle.

20 is a sectional view taken along line XX-XX in FIG.

FIG. 21 is a partial sectional view corresponding to FIG. 4 of a fluid ejection nozzle according to a sixth embodiment.

FIG. 22 is a partial plan view of a third plate member.

FIG. 23 is a partial plan view of a fluid ejection nozzle according to a seventh embodiment.

FIG. 24 is a partial plan view of the first plate member.

FIG. 25 is a partial plan view of a second plate member.

FIG. 26 is a partial plan view of a third plate member.

FIG. 27 is a cross-sectional view of a peripheral portion of a fluid ejection nozzle showing a conventional example.

FIG. 28 is a partially cutaway plan view of the fluid ejection nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel injection valve main body (fluid injection valve main body) 3 Valve seat 3b Injection port 5 Fuel injection nozzle (fluid injection nozzle) 5a Injection hole 51 First plate material 51a Inlet hole (hole) 52 Second plate material 52a Slot (hole) 53 First plate 53a Exit hole (hole) 53b Edge

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukinori Kato 1-1, Kyowa-cho, Obu City, Aichi Prefecture Ai San Industry Co., Ltd. F-term (reference) 3G066 AB02 BA02 BA17 BA23 CC06U CC15 CC24 CC26 CC28 CC29 CD04 CD15 CD30 CE22 CE31 4F033 AA13 BA03 CA01 DA05 EA01 JA03 MA00 NA01

Claims (9)

[Claims] 1. An inlet hole and an outlet hole provided on a fluid injection valve body for injecting a fluid from an injection port by opening a valve and controlling a flow direction of the fluid injected from the injection port in a stepwise manner. A fluid injection nozzle including an injection hole including a plurality of holes, wherein a hole having one end communicating with the outlet hole is formed by a long hole extending in a direction intersecting a nozzle axis. A fluid ejecting nozzle, wherein an inlet-side hole communicates with the other end of the long hole, and the outlet hole forms an acute angle with the long hole. 2. The fluid ejection nozzle according to claim 1, wherein an outlet hole is disposed at a center of the nozzle with respect to an inlet hole communicating with the elongated hole. nozzle. 3. The fluid ejection nozzle according to claim 1, wherein the ejection holes are formed by stacking three or more plate members each having a hole. nozzle. 4. The fluid injection nozzle according to claim 1, wherein a hole forming the injection hole is formed integrally with a member forming the injection port of the fluid injection valve body. A fluid injection nozzle characterized by the above-mentioned. 5. The fluid ejection nozzle according to claim 1, wherein the number of holes communicating with each other is different from each other. 6. The fluid ejection nozzle according to claim 1, wherein a difference between members in an elongated hole portion and an outlet hole portion communicated with each other by assembling the members. Where T is T, the hole width W of the long hole portion and the hole diameter φd of the outlet hole portion are set to values satisfying the condition of WT ≧ φd. 7. The fluid ejection nozzle according to claim 1, wherein the outlet hole has a constant width in a direction intersecting the elongated hole. nozzle. 8. The fluid ejecting nozzle according to claim 7, wherein a variation tolerance between the members is set to Ta between an elongated hole portion and an outlet hole portion which are mutually connected by assembling the members.
Wherein the maximum width Wa of the long hole portion and the effective length L of the fixed width of the outlet hole portion are set to values satisfying the following condition: Wa ≦ L + Ta. 9. A fluid injection valve comprising the fluid injection nozzle according to claim 1. Description: