JPH07246352A - Fluid jetting nozzle and its production - Google Patents

Abstract

PURPOSE:To provide a fluid jetting nozzle for which the manufacture, assembling and fitting of plural constituting parts are easy and by which a fluid is sprayed in fine particles and a method for producing the same. CONSTITUTION:This fluid jetting nozzle is provided with a cap-like sleeve 102 having the 1st orifice 78 in the shape of a slit and a plate 104 having the 2nd orifice 80. The 1st orifice 78 and the 2nd orifice 80 intersect mutually at right angles in the longitudinal direction, and they are both formed into a taper, and a communicating path is formed at a part where they intersect each other. On production, after the plate 104 is jointed and fixed to a recessed groove 112 of the sleeve 102 by ultrasonic welding, the integrated sleeve 102 and plate 104 are force-fitted and fixed to a needle body 25. In this way, fuel is jetted in sectrial form so that a jetting angle may be the desired one, and a quantity adjusting mechanism 100 for accelerating the atomizing of the jetted fuel is easily produced.

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, and more particularly, to an injection nozzle portion of an electromagnetic fuel injection valve for injecting and supplying fuel to an internal combustion engine for automobiles.

[0002]

2. Description of the Related Art Generally, a fuel injection valve used in an internal combustion engine has a valve member slidably accommodated in a guide hole formed in an axial direction of a valve body, and has a nozzle hole opened at a tip portion of the valve body. It is opened and closed by the vertical movement of the valve member. Therefore, in the valve member, the lift amount when the valve is opened is precisely controlled so as to secure an appropriate fuel injection amount.

As the prior art, Japanese Patent Laid-Open No. 61-10415
The fuel injection valve disclosed in Japanese Unexamined Patent Publication No. 6 has a large number of slit-shaped orifices in front of the injection holes, and the fuel from the injection holes is passed through the slit-shaped orifices, whereby the fuel is spread into a wide angle and atomized. I am spraying. In addition, JP-A-2-
Japanese Patent No. 75757 discloses a device provided with a plurality of silicon plates on the front side of the injection hole. By using a silicon plate, a precise fuel passage hole pattern is formed to control the fuel flow.

Further, US Pat. No. 4,647,013 discloses a fuel injection valve provided with a silicon flat plate having an orifice for controlling the fuel flow in front of the injection hole.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
As disclosed in Japanese Patent No. 04156, various injection hole shapes have hitherto been attempted in order to promote atomization of spray. However, it was difficult to achieve sufficient atomization with the injection hole shape disclosed in the prior art.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a fluid injection nozzle capable of atomizing and atomizing a fluid, and a method for manufacturing the same. Another object of the present invention is to provide a fluid injection nozzle in which a fluid injection nozzle having a metering function can be easily attached to the outlet of an injection hole of a fuel injection valve, and a method for manufacturing the same.

Still another object of the present invention is to provide a fluid ejection nozzle and a method of manufacturing the fluid ejection nozzle, in which a plurality of parts constituting the fluid ejection nozzle can be easily positioned and assembled.

[0008]

A fluid injection nozzle according to claim 1 of the present invention for achieving the above object is a fluid injection nozzle fixed to an outlet portion of an injection hole of an injection valve body. The injection nozzle includes a first member having a first flat surface portion and a first peripheral surface portion protruding from the periphery of the first flat surface portion, and a second member having a second flat surface portion overlapped with the first flat surface portion, The first peripheral surface portion includes an inner wall that fits into an outlet portion of the injection hole, the first flat surface portion includes a hole through which fluid ejected from the injection hole portion passes, and the second member includes the hole. It is characterized by being provided with a slit-shaped orifice communicating with each other.

According to a second aspect of the present invention, in the fluid jet nozzle according to the first aspect, the second member and the groove provided in the first member are fitted with each other, and the hole is a slit-shaped orifice. . The fluid injection nozzle according to claim 3 of the present invention is the fluid injection nozzle according to claim 2, wherein the first member is located upstream of the second member.

According to a fourth aspect of the present invention, in the fluid jet nozzle according to the second aspect, the first member is located downstream of the second member. A fluid injection nozzle according to a fifth aspect of the present invention is the fluid injection nozzle according to the second aspect, wherein the second member also has a second peripheral surface portion protruding from the periphery of the second flat surface portion, and the second peripheral surface portion and the first member are adjacent to each other. is doing.

A fluid jet nozzle according to a sixth aspect of the present invention is the fluid jet nozzle according to the first aspect, wherein the second member comprises a plurality of plates fitted into grooves provided in the first member, and each of the plates is a slit-shaped orifice. And the slit-shaped orifice partially communicates. Claim 7 of the present invention
7. The fluid ejection nozzle according to claim 2, wherein
The member is located downstream of the first member.

According to an eighth aspect of the present invention, there is provided the fluid jet nozzle according to the sixth aspect, wherein the second member is located upstream of the first member. An injection valve according to a ninth aspect of the present invention is the injection valve according to the first aspect, wherein the fluid injection nozzle is attached to the injection valve body. A method for manufacturing a fluid injection nozzle according to claim 10 of the present invention is the method according to any one of claims 1 to 8, wherein the first member and the second member are provided.
The method is characterized by including the step of joining and fixing the member and the member by ultrasonic welding.

A method for manufacturing a fluid jet nozzle according to an eleventh aspect of the present invention is the method for manufacturing a fluid ejection nozzle according to any one of the first to eighth aspects, which includes a step of fixing the first member and the second member by heat staking. Is characterized by. Claim 1 of the present invention
A method for manufacturing a fluid ejection nozzle according to claim 2, wherein
And any one of claims 6 to 8, wherein the first
The method is characterized by including a step of fixing the member and the second member by insert molding.

A method for manufacturing an injection valve according to a thirteenth aspect of the present invention is characterized in that, in the ninth aspect, the method includes a step of joining and fixing the first member and the second member by ultrasonic welding. 9. The method for manufacturing an injection valve according to item 9. A method for manufacturing an injection valve according to a fourteenth aspect of the present invention is characterized in that, in the fourteenth aspect, the method includes a step of fixing the first member and the second member by heat staking.

A method for manufacturing an injection valve according to a fifteenth aspect of the present invention is the method of fixing the first member and the second member by insert molding according to any one of the first to fourth and sixth to eighth aspects. It is characterized by including.

[0016]

According to the structure of the first aspect, the fluid ejected from the injection hole of the injection valve main body passes through the hole provided in the first member and is then ejected through the slit-shaped orifice. . Therefore, it promotes atomization of the injected fluid. Moreover, since the inner wall is fitted to the outlet of the injection hole portion of the injection valve 1, it can be easily attached. Further, the simple structure of stacking the first member and the second member facilitates assembly.

According to the structure of claim 2, the hole provided in the first member is also a slit-shaped orifice, and according to the structure of claim 6, each of the plurality of plates has a slit-shaped orifice. In both the configuration of claim 2 and the configuration of 6, the upstream slit-shaped orifice and the downstream slit-shaped orifice communicate with each other in part, and the upstream orifice has a groove shape except for the communication portion. Therefore, the fluid generates a flow that advances toward the communication portion along the slit-shaped upstream orifice. Then, this flow changes the flow direction when flowing into the orifice on the downstream side, and is jetted in a fan shape so that the jetting angle becomes a desired jetting angle and promotes atomization of the jetted fluid.

According to the manufacturing method of the fluid ejecting nozzle of the tenth aspect, since the first member and the second member are bonded and fixed by ultrasonic welding, the fluid ejecting nozzle having desired ejecting characteristics is manufactured by a simple method. be able to. According to the method of manufacturing a fluid injection nozzle according to claim 11 or 12, an upstream side of a fluid formed by a hole and an orifice for fixing the first member and the second member by heat staking or insert molding,
A fluid ejection nozzle having desired ejection characteristics can be manufactured in a simple manner without hindering the flow on the downstream side.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) A first embodiment in which the present invention is applied to a fuel injection valve of a fuel supply system for a gasoline engine is shown in FIGS.

As shown in FIG. 2, inside the resin housing 11 of the fuel injection valve 10 as a fluid injection nozzle,
The fixed iron core 21, the spool 91, the electromagnetic coil 32, the coil mold 31, and the metal plates 93 and 94 as magnetic paths are integrally formed. The fixed iron core 21 is made of a ferromagnetic material and is provided inside the housing 11 so as to project from above the coil mold 31. A guide tube 29 is fixed to the inner wall of the fixed iron core 21.

The electromagnetic coil 32 is wound around the resin spool 91, and then the spool 91 and the electromagnetic coil 32 are wound.
A coil mold 31 is resin-molded on the outer periphery of the coil mold 31 and the electromagnetic coil 32 is surrounded by the coil mold 31.
The coil mold 31 protects the cylindrical tubular portion 31a that protects the electromagnetic coil 32 and the lead wire that is electrically derived from the electromagnetic coil 32, and also retains the terminal 34, which will be described later, in the tubular portion 31a. And a protruding portion 31b protruding upward from. And the coil mold 3
The spool 91 and the electromagnetic coil 32 are mounted on the outer periphery of the fixed iron core 21 in a state of being integrated by 1.

The two metal plates 93 and 94 are provided such that one upper end thereof contacts the outer periphery of the fixed iron core 21 and the other lower end thereof contacts the outer periphery of the magnetic pipe 23.
It is a member that forms a magnetic path that allows the magnetic flux to pass when electricity is applied to it, and is covered on the outer periphery of the tubular portion 31a so as to sandwich the tubular portion 31a from both sides. These two metal plates 93 and 9
4, the electromagnetic coil 32 is protected.

The housing 11 is located above the housing 11.
The connector portion 11a is provided so as to project from the outer wall of the connector. Then, the terminal 34 electrically connected to the electromagnetic coil 32 is embedded in the connector portion 11 a and the coil mold 31. The terminal 34 is connected to an electronic control unit (not shown) via a wire harness.

One end of the compression coil spring 28 is in contact with the upper end surface of the needle 25 fixed to the movable iron core 22 by welding, and the other end of the compression coil spring 28 is in contact with the bottom of the guide tube 29. The compression coil spring 28 urges the movable iron core 22 and the needle 25 downward in FIG. 1 to seat the seat portion 42 of the needle 25 on the valve seat 26b of the needle body 26. When an exciting current flows from the terminal 34 through the lead wire to the electromagnetic coil 32 by an electronic control unit (not shown), the needle 25 and the movable iron core 22
Is attracted toward the fixed iron core 21 against the biasing force of the compression coil spring 28.

The non-magnetic pipe 24 is connected to the lower portion of the fixed iron core 21 and is formed into a stepped pipe shape having a large diameter portion 24a and a small diameter portion 24b. And the fixed iron core 2
A large-diameter portion 24a is connected to a lower portion of the first core 1 so as to partially project from a lower end of the fixed iron core 21. Further, at the lower end of the small-diameter portion 24b of the non-magnetic pipe 24, the small-diameter portion 23 of the magnetic pipe 23 made of a magnetic material and formed in a stepped pipe shape is formed.
b is connected. The inner diameter of the small-diameter portion 24b of the non-magnetic pipe 24 is set slightly smaller than the inner diameter of the small-diameter portion 23b of the magnetic pipe 23 to form a guide portion for the movable iron core 22.

Next, in the inner space of the non-magnetic pipe 24 and the magnetic pipe 23, a movable iron core 22 made of a magnetic material and formed in a cylindrical shape is provided. The outer diameter of the movable iron core 22 is set to be slightly smaller than the inner diameter of the small diameter portion 24b of the nonmagnetic pipe 24, and the movable iron core 22 is slidably supported by the nonmagnetic pipe 24. The upper end surface of the movable iron core 22 is provided so as to face the lower end surface of the fixed iron core 21 with a predetermined gap.

A collar-shaped joint 43 is formed on the needle 25.
Are formed. Then, the joint portion 43 and the movable iron core 22
Are laser-welded, and the needle 25 and the movable iron core 22 are integrally connected. Further, a flange 44 is formed near the lower part of the joint portion 43. A plurality of grooves as fuel passages are formed on the outer periphery of the joint portion 43. A filter 33 is provided above the fixed iron core 21 to remove foreign matters such as dust in the fuel that is pressure-fed from the fuel tank by a fuel pump or the like and flows into the fuel injection valve 10.

The fuel that has flowed into the fixed iron core 21 through the filter 33 flows from the guide tube 29 to the joint portion 4 of the needle 25.
3 and the knurled groove formed in the guide portion 41 of the needle 25, and further passes through the gap between the knurled groove formed in the needle body 26 and the seat portion 42 at the tip of the needle 25. The valve portion including the valve seat 26b is reached, and from this valve portion, the injection hole 26c is reached.

Next, the structure of the discharge portion 50 of the fuel injection valve 10 will be described with reference to FIG. A needle body 26 is inserted into the large diameter portion 23a of the magnetic pipe 23 via a hollow disk-shaped spacer 27 and laser-welded. The thickness of the spacer 27 is the same as that of the fixed core 21 and the movable core 2.
It is adjusted to keep the air gap between the two at a predetermined value. On the inner wall of the needle body 26, the needle 25
Of the cylindrical surface 26a on which the guide portion 41 of the needle slides and the needle 2
5 and a valve seat 26b on which the conical seat portion 42 of 5 is seated. Further, an injection hole 26c is formed in the center of the bottom of the needle body 26.

A flange 36 is formed on the needle 25 so as to face the lower end surface of the spacer 27 accommodated in the inner wall of the large diameter portion 23a of the magnetic pipe 23 with a predetermined gap. The flange 36 is formed on the side of the seat portion 42 formed at the tip of the needle 25 in the entire length of the needle 25, and the needle body 2 is formed below the flange 36.
A guide portion 41 that can slide is formed on the cylindrical surface 26a formed on the surface 6. A knurled groove is formed on the outer periphery of the joint portion 43 and the guide portion 41 formed on the needle 25 by rolling or the like.

A metering mechanism 100 having a metering function is attached to the injection hole outlet of the needle body 26. The metering mechanism 100 includes a first orifice 78 formed in the sleeve 102 and a second orifice 80 formed in the orifice plate 104. The sleeve 102 is made of resin and has a hat-like shape, and has a disc portion 106, a tubular tubular portion 108 that is vertically raised from an outer peripheral portion of the disc portion 106, and the tubular portion 108.
And a flange portion 110 formed in an L-shaped annular shape on the outer peripheral portion thereof. A first orifice 78 is formed in the center of the disc portion 106 at a position located in the center of the outlet of the injection hole 26c. The first orifice 78 is formed by a four-sided inclined inner wall so as to taper in an aperture shape so that the opening area becomes gradually smaller from the inlet portion toward the outlet portion.

The second orifice plate 104 is fitted in a circular groove 112 formed on the outlet side surface of the disk portion 106 of the sleeve 102. This allows the positioning of the first and second orifices. The second orifice plate 104 is made of resin, and a slit-shaped second orifice 80 extending in a direction orthogonal to the first orifice 78 is formed in a substantially central portion thereof. The second orifice 80 is formed in a tapered shape so that the opening area gradually decreases from the inlet side toward the outlet side. A concave groove 114 is formed around the outlet of the second orifice 80. The groove 114 defines a space so as not to interfere with the spray of the fuel ejected from the second orifice 80.

When assembled, the concave groove 1 of the resin sleeve 102
After the second orifice plate 104 is ultrasonically welded to 12 to be integrated, the sleeve 102 is brought into contact with the end surface 26d of the needle body 26 with the inlet surface 106a of the disk portion 106, and the peripheral surface 26e of the needle body and the inner wall Press-fit and fix so that 108a contacts. According to the first embodiment, the metering mechanism 100 including the sleeve 102 and the second orifice plate 104 can be assembled and fixed to the needle body 26 by a simple manufacturing method. According to the metering mechanism 100 fixedly assembled, the spray characteristic of the fuel ejected from the injection hole 26c can be controlled to the desired injection characteristic as described above.

1 and 2, when the needle 25 is lifted from the valve seat 26b of the needle body 26, the injection hole 26
Fuel is injected from c. Then, the fuel injected from the injection hole 26c passes through the through hole 79 at the intersection of the first orifice 78 and the second orifice 80 and is injected and supplied downward. At this time, as for the fuel trying to pass through the first orifice 78, as shown in FIG. 3, a part of the fuel hits the upper surface of the second orifice plate 104, and the upper surface 104 a and the wall surface of the first orifice 78. The groove defined by and flows as a runway toward the through hole 79,
Flows C and D from the runways on both sides collide with each other on 9 and change directions, and pass through the second orifice 80 while expanding in a fan shape in the longitudinal direction thereof as indicated by dotted arrows E and F.
Here, the fuel blown through the through hole 79 in which the first orifice 78 and the second orifice 80 overlap with each other, the fuel sprayed by the two wall surfaces extending in the longitudinal direction among the four wall surfaces forming the second orifice 80. The spreading direction is restricted. In this way, the fuels flowing through the first orifice 78 as the runway collide with each other, spread along the spray guide path formed by the second orifice 80, and the tapered shape formed in the second orifice. The fuels flowing on the opposing tapered surfaces of the fuel cells further collide with each other, further promoting atomization as compared with the straight orifice.
Moreover, in this embodiment, since the groove-shaped runway is formed by the first orifice 78 and the upper surface of the second orifice plate 104, the slit-shaped orifices are formed on the two planar members and overlap each other. An excellent atomization spray can be obtained with a simple configuration in which the is simply pressed into the needle body 26.

According to the first embodiment, the fuel injected from the injection hole 26c is injected through the first orifice 78 and the second orifice 80. Since this injected fuel passes through the first orifice 78 that is tapered and then passes through the second orifice 80 that is further tapered, it is atomized and has a narrow injection angle in one direction. The spray shape has spray characteristics. Therefore, the fuel supplied from the intake port (not shown) to the combustion chamber of the internal combustion engine has a spray shape that facilitates combustion.

Although the orifice plate is provided on the downstream side of the sleeve in the first embodiment, the orifice plate may be provided on the upstream side of the sleeve. (Second Embodiment) A second embodiment in which the present invention is applied to a fuel injection valve of a fuel supply device for a gasoline engine is shown in FIGS. 4 and 5.

This metering mechanism 300 includes two sleeves 3
It is composed of 02 and 304. First sleeve 302
Is made of resin and has a hat-like shape.
And a tubular tubular portion 312 that is vertically raised from the outer peripheral portion of the disc portion 310, and a flange portion 314 formed in an L-shaped annular shape on the outer peripheral portion of the tubular portion 312.
A first orifice 78 is formed in the center of the disc portion 310 at the center of the outlet of the injection hole 26c. The first orifice 78 is formed by a four-sided inclined inner wall so as to taper in an aperture shape so that the opening area becomes gradually smaller from the inlet portion toward the outlet portion.

The second sleeve 304 is made of resin and has a hat-like shape, and the disc portion 3 of the first sleeve 302 is formed.
10 and the outer periphery of the cylindrical portion 312 are joined by ultrasonic welding. The second sleeve 304 has a slit-shaped second orifice 80 extending in a direction orthogonal to the first orifice 78 at a substantially central portion thereof. The second orifice 80 is formed in a tapered shape so that the opening area gradually decreases from the inlet side toward the outlet side. Second
A groove 114 is formed around the exit of the orifice 80. The groove 114 defines a space so as not to interfere with the spray of the fuel ejected from the second orifice 80.

At the time of assembling, the flange portion 308 of the second sleeve 304 is ultrasonically welded to the stepped fitting portion 306 of the first sleeve 302 having the first orifice 78 to be integrated. This allows the positioning of the first and second orifices. Next, the integrated first sleeve 302 and second sleeve 304 are attached to the end surface 2 of the needle body 26.
The inlet surface 302a of the first sleeve 302 is press-fitted and fixed to 6d.

According to the second embodiment, the first sleeve 30
2 and second sleeve 304
00 can be assembled and fixed to the needle body 26 by a simple manufacturing method. This fixed and fixed metering mechanism 3
According to 00, the spray characteristic of the fuel ejected from the injection hole 26c can be controlled to the desired injection characteristic as described above.

(Third Embodiment) FIG. 6 and FIG. 7 show a third embodiment in which the present invention is applied to a fuel injection valve of a fuel supply system for a gasoline engine. This metering mechanism 500 includes two sleeves 5
02 and 504, substantially the entire outer wall of the first sleeve 502 and the inner wall of the second sleeve 504 are joined by ultrasonic welding.

The first sleeve 502 is made of resin and has a hat-like shape, and has a disc portion 510 and the disc portion 51.
0-shaped tubular portion 5 that rises vertically from the outer peripheral portion
It consists of 12. The tubular portion 512 extends to the vicinity of the magnetic pipe 23. A first orifice 78 is formed in the center of the disc portion 510 at the center of the outlet of the injection hole 26c. The first orifice 78 is formed by a four-sided inclined inner wall so as to taper in an aperture shape so that the opening area becomes gradually smaller from the inlet portion toward the outlet portion.

The second sleeve 504 is made of resin and has a hat-like shape, and has a disc portion 520 and the disc portion 52.
0-shaped tubular portion 5 that rises vertically from the outer peripheral portion
22 and a flange portion 524 formed in an L-shaped annular shape on the outer peripheral portion of the tubular portion 522. First sleeve 50
End portion 512a of the second tubular portion 512 and the second sleeve 504
The end portion 522 a of the cylindrical portion 522 extends to a position in the vicinity of the magnetic pipe 23 that is substantially the same in the axial direction.

The second sleeve 504 is fitted on the outer circumferences of the disc portion 510 and the cylindrical portion 512 of the first sleeve 502. The disc portion 520 of the second sleeve 504.
A slit-shaped second orifice 80 extending in a direction orthogonal to the first orifice 78 is formed in the substantially central portion thereof. The second orifice 80 is formed in a tapered shape so that the opening area gradually decreases from the inlet side toward the outlet side. A concave groove 114 is formed around the outlet of the second orifice 80. This groove 114 is the second
The space is partitioned so as not to interfere with the spraying of the fuel ejected from the orifice 80.

At the time of assembly, the first and second orifices are positioned by fitting the outer circumference of the first sleeve 502 and the inner circumference of the second sleeve 504, and both are ultrasonically welded to be integrated. . Then integrated first sleeve 502
The second sleeve 504 and the second sleeve 504 are press-fitted and fixed to the end surface 26d of the needle body 26 so that the inlet surface of the disk portion 510 abuts.

According to the third embodiment, the first sleeve 50
2 and second sleeve 504
00 can be assembled and fixed to the needle body 26 by a simple manufacturing method. That is, at the time of assembly, the second sleeve 504 is fixed to the outer peripheral wall surface 506 of the first sleeve 502 by ultrasonic welding and integrated, and then the needle body 2
6 is fixed to the end face 26d. According to the metering mechanism 500 fixedly assembled, the spray characteristic of the fuel ejected from the injection hole 26c can be controlled to the desired injection characteristic as described above.

In the second embodiment, the disc portion, the tubular portion, the L
The ring-shaped annular flange portion is provided on the first sleeve, the disc portion, and the tubular portion on the second sleeve. In the third embodiment, the disc portion,
The tubular portion is provided on the first sleeve, and the disc portion and the L-shaped annular portion are provided on the second sleeve. However, these portions may be provided on each sleeve in any combination, and more complicated It may be shaped. The number of sleeves may be three or more.

(Fourth Embodiment) FIG. 8 and FIG. 9 show a fourth embodiment in which the present invention is applied to a fuel injection valve of a fuel supply system for a gasoline engine. The metering mechanism 200 includes the first orifice 78.
And a second orifice plate 204 having a second orifice 80 and a sleeve 206.

The first orifice plate 202 is made of metal or silicon, and the first orifice 7 is provided at the center thereof.
8 is formed. The first orifice 78 has a slit shape and is formed of four inner walls such that the opening area gradually decreases from the inlet to the outlet. The second orifice plate 204 is made of metal or silicon, and the first orifice plate 204 is provided at the center of the first orifice plate 204.
A slit-shaped second orifice 80 extending in a direction orthogonal to the orifice 78 is formed. The second orifice 80 is formed in a slit shape and has an inner wall of four faces so that the opening area gradually decreases from the inlet to the outlet.

The sleeve 206 is made of resin and has a hat-like shape, a thin plate portion 214 having a through hole 216 in the center thereof, a cap portion 212 having a groove 208, and an outer periphery of the cap portion 212. And a tubular tubular portion 218 that is vertically raised from the above portion, and an L-shaped outer circumferential portion of the tubular portion 218.
And a flange portion 220 formed in an annular shape. Then, the thin plate portion 214 that partially forms the concave groove 208 is formed.
The first orifice plate 202 and the second orifice plate 204 are superposed on each other so that the first orifice 78 and the second orifice 80 are orthogonal to each other, and the thin plate portion 21
The first orifice plate 202 and the second orifice plate 204 are fixed to the sleeve 206 from the side opposite to 4 by thermal staking.

At the time of assembling, the first and second orifice plates 202 and 204 are fitted into the concave grooves 208 of the sleeve 206 to position the first and second orifices. A portion of the second orifice plate 204, which corresponds to the outer peripheral edge portion, is heat-crimped. As a result, the first orifice plate 202 and the second orifice plate 202 are made of resin that forms a part of the sleeve 206.
The orifice plate 204 and the orifice plate 204 are fixed to the sleeve 206. Next, the sleeve 206 is press-fitted and fixed to the end surface 26d of the needle body 26 so that the inlet surface of the thin plate portion 214 abuts. In FIG. 5, reference numeral 210 denotes a heat staking fixing portion formed in an annular shape.

According to the fourth embodiment, the first through which the fuel passes
When manufacturing a fluid injection nozzle having a second hole and a second hole, a metering mechanism 200 including a first orifice plate 202 and a second orifice plate 204.
Can be assembled and fixed to the needle body 26 by a simple manufacturing method. (Fifth Embodiment) FIG. 10 and FIG. 11 show a fifth embodiment in which the present invention is applied to a fuel injection valve of a fuel supply system for a gasoline engine.

This metering mechanism 400 is characterized in that the first orifice plate 402 and the second orifice plate 404 are integrated with the sleeve 406 by insert molding. The metering mechanism 400 includes a first orifice plate 402 having a first orifice 78, a second orifice plate 404 having a second orifice 80, and a sleeve 406.

The first orifice plate 402 is made of metal or silicon, and the first orifice 7 is provided at the center thereof.
8 is formed. The first orifice 78 has a slit shape and is formed of four inner walls such that the opening area gradually decreases from the inlet to the outlet. The second orifice plate 404 is made of metal or silicon, and the first orifice plate 404 has a first portion at the center thereof.
A slit-shaped second orifice 80 extending in a direction orthogonal to the orifice 78 is formed. The second orifice 80 is formed in a slit shape and has an inner wall of four faces so that the opening area gradually decreases from the inlet to the outlet.

The sleeve 406 is made of resin and has a hat-like shape, a thin plate portion 214 having a through hole 216 in the center thereof, a cap portion 212 having a groove 208, and an outer periphery of the cap portion 212. And a tubular tubular portion 218 that is vertically raised from the above portion, and an L-shaped outer circumferential portion of the tubular portion 218.
And a flange portion 220 formed in an annular shape. Then, the thin plate portion 214 that partially forms the concave groove 208 is formed.
The first orifice plate 402 and the second orifice plate 404 are superposed on each other so that the first orifice 78 and the second orifice 80 are orthogonal to each other, and the thin plate portion 21
The first orifice plate 402 and the second orifice plate 404 are fixed to the sleeve 406 from the side opposite to 4 by thermal staking.

At the time of manufacture, the first orifice plate 402
And the second orifice plate 404 are superposed on each other and insert-molded. This allows the positioning of the first and second orifices. The obtained molded body is a sleeve 4
The first orifice plate 402 and the second orifice plate 404 are embedded in the inside of 06. According to the fifth embodiment, in manufacturing the fluid injection nozzle having the first hole and the second hole through which the fuel passes, the adjustment including the first orifice plate 402 and the second orifice plate 404 is performed. Since the measuring mechanism 400 is manufactured by insert molding and the molded product is press-fitted and fixed to the needle body 26, it can be assembled and fixed by a simple manufacturing method.

Although the two plates are provided on the downstream side of the sleeve in the fourth and fifth embodiments, they may be provided on the upstream side. Further, the number of plates may be three or more. First to above
In the fifth embodiment, the hole shapes of the first and second orifices are both tapered, but the hole shape may be straight or flared.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment in which a fluid injection nozzle of the present invention is applied to a fuel injection valve.

FIG. 2 is an enlarged sectional view showing a main part of the first embodiment shown in FIG.

FIG. 3 is a schematic perspective view showing the flow of fuel in the fluid injection nozzle according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a second embodiment in which the fluid injection nozzle of the present invention is applied to a fuel injection valve.

5 is an enlarged cross-sectional view showing a main part of the second embodiment shown in FIG.

FIG. 6 is a sectional view of a third embodiment in which the fluid injection nozzle of the present invention is applied to a fuel injection valve.

FIG. 7 is an enlarged sectional view showing a main part of the third embodiment shown in FIG.

FIG. 8 is a sectional view of a fourth embodiment in which the fluid injection nozzle of the present invention is applied to a fuel injection valve.

9 is an enlarged cross-sectional view showing the main parts of the fourth embodiment shown in FIG.

FIG. 10 is a sectional view of a fifth embodiment in which the fluid injection nozzle of the present invention is applied to a fuel injection valve.

FIG. 11 is an enlarged cross-sectional view showing the main parts of the fifth embodiment shown in FIG.

[Explanation of symbols]

10 Fuel Injection Valve 25 Needle 26 Needle Body 26c Injection Hole 70 First Orifice Plate (First Plate) 74 Second Orifice Plate (Second Plate) 78 First Orifice (Hole) 80 Second Orifice ( Slit-like orifice) 102 Sleeve (first member) 104 Orifice plate (second member) 106 Disc portion (first flat surface portion) 108 Cylindrical portion (first peripheral surface portion) 108a Inner wall 202 First orifice plate 204 Second Orifice plate 206 Sleeve 302 First sleeve 304 Second sleeve 402 First orifice plate 404 Second orifice plate 406 Sleeve 502 First sleeve 504 Second sleeve

Claims (15)

[Claims] 1. A fluid injection nozzle fixed to an outlet of an injection hole of an injection valve body, the fluid injection nozzle having a first flat surface portion and a first peripheral surface portion protruding from the periphery of the first flat surface portion. A first member; and a second member having a second flat surface portion that is superposed on the first flat surface portion, the first peripheral surface portion having an inner wall that fits into an outlet portion of the injection hole, The flat surface portion includes a hole through which the fluid ejected from the injection hole portion passes, and the second member includes a slit-shaped orifice communicating with the hole. 2. The fluid ejection nozzle according to claim 1, wherein the second member and the groove provided in the first member are fitted to each other, and the hole is a slit-shaped orifice. 3. The fluid ejection nozzle according to claim 2, wherein the first member is located upstream of the second member. 4. The fluid ejection nozzle according to claim 2, wherein the first member is located downstream of the second member. 5. The fluid jet according to claim 2, wherein the second member also has a second peripheral surface portion protruding from the periphery of the second flat surface portion, and the second peripheral surface portion and the first member are adjacent to each other. nozzle. 6. The second member comprises a plurality of plates that fit into grooves provided in the first member, each plate having a slit-shaped orifice, and the slit-shaped orifice is partially in communication. Item 1
The fluid injection nozzle according to. 7. The fluid ejection nozzle according to claim 6, wherein the second member is located downstream of the first member. 8. The fluid ejection nozzle according to claim 6, wherein the second member is located upstream of the first member. 9. The injection valve according to claim 1, wherein the fluid injection nozzle is attached to the injection valve body. 10. The method for manufacturing a fluid ejection nozzle according to claim 1, further comprising a step of joining and fixing the first member and the second member by ultrasonic welding. . 11. The method for manufacturing a fluid ejection nozzle according to claim 1, further comprising a step of fixing the first member and the second member by heat staking. 12. The fluid jet according to claim 1, further comprising the step of fixing the first member and the second member by insert molding. Nozzle manufacturing method. 13. The method for manufacturing an injection valve according to claim 9, further comprising a step of joining and fixing the first member and the second member by ultrasonic welding. 14. The method of manufacturing an injection valve according to claim 9, further comprising the step of fixing the first member and the second member by heat staking. 15. The injection valve according to any one of claims 1 to 4 and 6 to 8, further comprising a step of fixing the first member and the second member by insert molding. Manufacturing method.