KR20170072011A - Injector having an elastic plate - Google Patents

Injector having an elastic plate Download PDF

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Publication number
KR20170072011A
KR20170072011A KR1020150180328A KR20150180328A KR20170072011A KR 20170072011 A KR20170072011 A KR 20170072011A KR 1020150180328 A KR1020150180328 A KR 1020150180328A KR 20150180328 A KR20150180328 A KR 20150180328A KR 20170072011 A KR20170072011 A KR 20170072011A
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KR
South Korea
Prior art keywords
elastic plate
hole
valve seat
center
ball
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KR1020150180328A
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Korean (ko)
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KR101796562B1 (en
Inventor
박중원
박정환
송재천
신문성
Original Assignee
주식회사 현대케피코
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Priority to KR1020150180328A priority Critical patent/KR101796562B1/en
Publication of KR20170072011A publication Critical patent/KR20170072011A/en
Application granted granted Critical
Publication of KR101796562B1 publication Critical patent/KR101796562B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends

Abstract

The injector according to the embodiment of the present invention is made of a material having the property of elastic force and is formed to include an elastic plate formed including the legs. Despite the gap formed between the lower surface of the carrier and the upper surface of the ball guide through the elastic plate having such characteristics, the foreign matter of the fuel is stably fixed on the ball guide, The elastic plate can be fixed between the intervals set by assembling the carrier.

Description

[0001] INJECTOR HAVING AN ELASTIC PLATE [0002]

The technique relates to an injector. In particular, the injector of the present invention comprises an elastic plate formed with legs made of elastic means. Therefore, the injector of the present invention is capable of filtering the foreign matter of the fuel stably by fixing the elastic plate on the ball guide only by assembling the product without any effort, and maintaining the distance between the lower part of the carrier and the upper part of the ball guide It is possible.

The disclosure of Japanese Patent Laid-Open No. 1997-014026 discloses a vehicle injector. Specifically, the above-mentioned patents disclose drawings in which an injector is mounted on an engine, the role of an injector, and the like.

The injector injects the fuel into the fuel injection nozzle in a fine mist shape so that the fuel mixes well with the air.

Most of the injectors are electronically controlled. That is, the injector is controlled in such a manner that the fuel is injected by opening the injection hole only when the power source is supplied to the injector.

The injection hole opening of this injector is operated by the needle and the ball. The needle can be combined with a ball or the like to become a needle assembly.

Here, for convenience of explanation, the needle assembly will be described as an example.

Here, the connection of the needle assembly means that the connection relationship and the coupling relationship do not matter when the needle and the ball are connected so as to be linearly movable.

When the injector injects fuel, when the power is applied to the injector, the needle assembly which has closed the injection hole of the valve seat moves upward and opens the injection hole. When the power supplied to the injector is cut off, the needle assembly moves downward to close the injection hole.

The linear motion of the needle assembly is controlled by the ECU.

Here, in order for the injector to perform the fuel injection function, the carrier and the valve seat must be assembled in consideration of the distance that the needle assembly moves upward when power is supplied by the ECU and moves downward when the power is shut off. That is, when the valve seat is engaged with the carrier, the lower surface of the carrier and the upper portion of the ball guide must be assembled while maintaining a predetermined distance.

 However, in the case of assembling as described above, a separate effort is required to assemble the lower surface of the carrier and the upper part of the ball guide while maintaining a predetermined gap, and at the same time, because of the set distance formed between the carrier and the ball guide, There is a problem that it can not be stably fixed.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

It is an object of the present invention to provide an injector capable of maintaining a gap between a carrier and a ball guide even when a carrier and a valve seat are assembled by using an elastic plate formed with elastic legs.

In this technique, an elastic plate is used which includes legs formed as elastic means, and the elastic plate is stably fixed between the carrier and the ball guide in spite of the set interval between the carrier and the ball guide, The purpose is to provide.

The technical problem to be solved by the present invention is not limited to the above-mentioned technical problems and other technical problems which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

To achieve the above object, the injector according to the present invention includes a housing, a carrier, a solenoid, an armature, a needle, a ball, a valve seat, a ball guide, and an elastic plate.

The housing has a space in which the parts of the injector can be accommodated.

The carrier has a space in which the needle can be accommodated in the longitudinal direction.

The solenoid part consists of a bobbin and a coil. The coil may be wound on the winding portion formed in the bobbin. The solenoid portion may be disposed on one side of the housing.

The amateur can be installed to allow linear motion below the solenoid.

Here, the armature moves upward when a power is supplied to the solenoid portion and a magnetic force is generated, and moves down when the power is cut off to the solenoid portion.

That is, the armature moves a distance set by the magnetic force of the solenoid portion.

The needle may be movably connected to the amateur. Therefore, when the armature performs a linear motion, the needle also performs a linear motion. Here, the needles move in the same distance as the amateur.

The ball is connected to the bottom of the needle. Therefore, the ball also performs linear motion when the needle is in linear motion. Here, the ball, like the needle and the amateur, travels the set distance.

The ball can open and close the injection hole formed in the valve seat. That is, the ball opens or closes the injection hole formed in the valve seat through linear motion.

Here, the balls and the needles can be combined into a needle assembly.

The valve seat may have a space formed therein and an upper portion opened.

The valve seat is coupled to the lower portion of the carrier.

A spray hole is formed at the bottom of the valve seat, and the spray hole is opened and closed by the linear motion of the ball as described above.

The ball guide is installed in the inside of the valve seat through a space in which the valve seat is opened in a cylindrical shape.

The ball guide is formed with a hollow hole through which the ball can move.

Here, the diameter of the ball guide hollow hole is formed not to be at least smaller than the diameter of the ball. Therefore, the ball guide serves to guide the ball so that the ball moves linearly upward in the movement and linearly moves in the downward direction.

The ball guide is formed with a fuel hole so that fuel can be injected into the injection hole formed in the valve seat by movement. The plurality of fuel holes may be formed so as to surround the hollow holes.

The elastic plate is placed on the upper part of the ball guide to elastically support the ball guide downward. And, the elastic plate can play a role of filtering the foreign matter of the injected fuel.

The elastic plate is formed by including a center plate and legs formed to extend from the center plate to one side and formed by bending.

The elastic plate is made of stainless steel, and after being formed by a pressing process, the legs can be formed by a bending process.

Here, the filtering holes of the elastic plate are formed by an etching method.

According to an embodiment, the shape of the filtration hole may be a filtration hole formed continuously along the circumferential direction at a certain circumference, and a filtration hole interval may be formed between the continuously formed filtration holes.

According to another embodiment, the shape of the filtration hole may be formed in the form of a plurality of circular filtration holes. That is, a plurality of circular filtration holes are formed along the circumferential direction in a small size.

The filtration hole according to another embodiment is formed by an etching process and has a very small diameter, so that even a very small foreign substance can be filtered, so that the filtering function of the elastic plate is further improved.

The center plate and the legs can be integrally formed as a single part.

Here, the center plate of the elastic plate is formed as a linear portion whose outer periphery shape is formed on a plurality of curved portions and a plurality of curved portions.

The elastic plate is press-fitted and fixed when it is installed in a cylindrical space formed inside the valve seat.

The center plate may have a center hole and a plurality of filtration holes.

Here, the center hole is formed at the central portion of the center plate of the elastic plate, and does not interfere with the linear motion of the ball.

A plurality of filtration holes are formed in the center plate of the elastic plate. Here, the filtration holes are formed in the circumferential direction while maintaining a constant length with respect to the center of the elastic plate.

Here, the filtration hole interval is also formed between the filtration holes formed in the circumferential direction and the filtration holes.

The legs are formed in an upward direction to include a plurality of legs that maintain a predetermined distance between the bottom surface of the carrier and the top of the ball guide.

Here, the plurality of legs of the elastic plate can be made to maintain the elastic force.

Here, the plurality of legs of the elastic plate may be divided into the highest middle portion and the lowest portion.

Here, the uppermost portion may be formed to extend to the middle portion and may be bent to maintain a constant angle with respect to the vertical direction.

Here, the highest portion abuts the lower surface of the carrier, abuts the lower surface of the carrier, and provides elastic force through the bent portion as described above. Because of this elasticity, the elastic plate elastically supports the ball guide with respect to the carrier. That is, one end of the leg is supported by the lower portion of the carrier and can provide elastic force to the ball guide through the center plate.

Further, the diameter between the intermediate portions of the legs is formed so as not to be smaller than the inner diameter of the valve seat, so that the elastic plate is stably fixed to the inner space of the valve seat upon press fitting.

Also, the legs of the elastic plate are symmetrically formed with respect to the center of the center plate, wherein the number of the legs is at least four or more.

According to another embodiment, three legs of the elastic plate may be formed at an angle of 120 degrees.

The injector manufacturing process of the present technology consists of an elastic plate manufacturing step, a ball guide press fitting step, an elastic plate fixing step, and a valve seat assembling step.

The elastic plate manufacturing step includes a center plate including a center hole and a filtration hole, the outer plate being formed by a curved portion and a straight line portion, a middle plate formed in a linear shape and protruding in one direction from the center plate, Thereby forming an elastic plate composed of legs including a top portion that maintains the angle set.

The ball guide press-in step is a step in which the ball guide is press-fitted into the valve seat in the form of a cylinder having an open top and a space formed therein.

In the elastic plate fixing step, the ball guide is press-fitted and fixed, and then the elastic plate is press-fitted into the valve seat and positioned on the upper surface of the ball guide to be fixed.

In the valve seat assembling step, the ball seat and the elastic plate are press-fitted and fixed, and the valve seat is press-fitted into the carrier.

According to the injector of the present invention having the above-described structure, it is possible to effectively maintain a predetermined gap between the lower surface of the carrier and the upper portion of the ball guide by using the elastic plate formed with the legs.

According to the injector of the present invention having the above-described structure, the elastic action of the elastic plate can be utilized to stably fix the lower surface of the carrier and the inner surface of the valve seat so as to filter the foreign matter of the fuel.

According to the injector manufacturing method of the present invention having the above-described steps, the injector is manufactured while easily maintaining the predetermined gap between the lower surface of the carrier and the upper portion of the ball guide, and at the same time, It is possible to produce an injector for filtering foreign matters of the engine.

1 is a cross-sectional view of an injector according to an embodiment of the present invention.
FIG. 2B is a perspective view of the elastic plate of the injector according to the embodiment of the present invention, and FIG. 2B is an enlarged perspective view of the elastic plate of the injector according to the embodiment of the present invention. 1 is an enlarged perspective view of a ball guide of an injector according to an embodiment of the present technology.
FIG. 3A is an enlarged view of a leg of the elastic plate of the injector according to the embodiment of the present invention, FIG. 3B is a top view of the elastic plate of the injector, FIG. 3C is a cross- Shape.
4 is a view showing a state in which a carrier and a valve seat of an injector according to an embodiment of the present invention are assembled.
5 is a view illustrating a step of manufacturing an injector according to an embodiment of the present invention.

Hereinafter, one embodiment of the present technology will be described in detail with reference to exemplary drawings. However, this is not intended to limit the scope of the present technology.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the structure and operation of the present technology are intended to illustrate embodiments of the present technology, and do not limit the scope of the present technology.

1 is a cross-sectional view of an injector 1 according to an embodiment of the present technology.

The injector 1 includes a housing 100, a carrier 200, a solenoid 10, an armature 20, a needle 30, a ball 40, a valve seat 300, a ball guide 50, (60), and the like.

The housing 100 has a space therein for accommodating parts. The space of the housing 100 may be formed in a circular shape, but is not limited thereto.

The carrier 200 is formed in a bar shape having a space at the center thereof for accommodating the needles 30. The carrier 200 is located at the bottom of the housing 100. The carrier 200 can engage with the housing 100 and a part of the outer surface of the carrier 200 and a part of the inner surface of the housing 100 can abut against each other.

The carrier 200 is open at the top and open at the bottom. That is, both the upper and lower portions of the carrier 200 are opened. Here, the armature 20 may be positioned on the upper portion of the carrier 200, and the valve seat 300 may be positioned on the lower portion of the carrier 200 .

The space formed at the center of the carrier 200 is long enough to receive the needle 30 and perform linear motion.

The solenoid portion 10 is composed of a coil (not shown) and a bobbin (not shown). That is, in the solenoid portion 10, the coil is wound on the winding portion formed on the bobbin. Here, the solenoid unit 10 may be located at one side of the inner space of the housing 100.

The solenoid portion 10 forms a magnetic force when power is supplied. This power source can be controlled by an ECU (not shown).

The armature 20 is located under the solenoid portion 10.

The armature 20 may be formed in a cylindrical shape. However, the armature 20 is not limited to a cylindrical shape.

The armature 20 linearly moves according to the magnetic force of the solenoid portion 10. That is, the armature 20 moves upward when the ECU (not shown) supplies power to the solenoid unit 10 when the magnetic force is generated, and moves downward when the power supply is shut off.

Here, the armature 20 linearly moves in accordance with the magnetic force of the solenoid portion 10, and this moving distance moves with a constant distance.

The needle 30 may be coupled through the armature 20. That is, the needle 30 is movably connected with the armature 20. Therefore, when the armature 20 performs a linear motion, the needle 30 also linearly moves.

The needle 30 is formed in an annular rod shape, and the length is formed to be similar to the length of the carrier 200.

Here, the diameter of the needle 30 is formed not to be at least larger than the inner diameter of the space formed at the center of the carrier 200. Therefore, the fuel can move through the space formed by the diameter of the space formed at the center of the needle 30 and the carrier 200.

The ball 40 is connected to the lower portion of the needle 30. For example, the ball 40 may be welded and connected to the lower portion of the needle 30. However, depending on the embodiment, the coupling of the needle 30 and the ball 40 is not limited to a fixed connection such as welding, and if the ball 40 is movably connected as the needle 30 moves, It does not matter.

In this embodiment, only the end of the needle 30 is in contact with the ball 40 only.

The ball 40 is movably connected to the needle 30. When the needle 30 moves upward, the ball 40 also moves upward. When the needle 30 moves downward, Also moves downward. That is, the ball 40 linearly moves together with the needle 30 when the needle 30 linearly moves.

The ball 40 opens and closes the injection hole 301 (see FIG. 4) formed in the valve seat 300 through the linear movement.

Here, the ball 40 may be formed to be slightly longer than the diameter of the needle 30.

The valve seat 300 may have a cylindrical shape and an injection hole 301 (see FIG. 4) may be formed at the bottom. The overall shape of the valve seat 300 can be seen as a cylindrical shape, but it is not a complete cylindrical shape.

The valve seat 300 is coupled to the carrier 200 at the bottom of the carrier 200. That is, the inner diameter of the valve seat 300 is greater than or equal to the outer diameter of the carrier 200, so that the outer surface of the carrier 200 is engaged with the inner surface of the valve seat 300. Here, the valve seat 300 may be press-fitted and fixed to the lower portion of the carrier 200.

A step is formed in the valve seat 300. The ball guide 50 may be inserted into the valve seat 300 to a position where the step is formed when the ball guide 50 is inserted into the valve seat.

A plurality of injection holes 301 formed in the lower portion of the valve seat 300 may be formed.

The injection hole 301 (see Fig. 4) of the valve seat 300 is opened and closed by the motion of the ball 40. As shown in Fig.

In this case, when the injector 1 is not supplied with power, the ball 40 is seated on the valve seat 300 and the injection hole 301 (see FIG. 4) is closed. Then, when power is supplied to the injector 1, the ball 40 moves upward to open the injection hole 301 (see FIG. 4), and the fuel is injected at the open timing. Then, when the power supplied to the injector 1 is cut off, the ball 40 moves downward and the injection hole 301 (see FIG. 4) is closed to stop the fuel injection.

The ball guide 50 may be formed in the shape of a cylinder. The ball guide 50 can be press-fitted into the valve seat 300. [ Here, the ball guide 50 is inserted into the internal space of the valve seat 300, which is inserted up to the step formed on the valve seat 300.

The ball guide 50 is provided with a hollow hole 53 (see FIG. 2C) and a plurality of fuel holes 51 (see FIG. 2C).

Here, the hollow hole 53 (see Fig. 2C) of the ball guide 50 is formed to be similar or at least not so small as the diameter of the ball 40. The ball 40 may penetrate through the hollow hole 53 (see FIG. 2C). When the ball 40 moves up and down by a power source supplied to the injector 1, Guide.

The fuel hole 51 (see FIG. 2C) of the ball guide 50 is formed so as to penetrate the ball guide 50 so that the fuel can be moved into the injection hole 301 (see FIG. 4). Here, for example, five fuel holes 51 (see Fig. 2C) are formed. However, the number of fuel holes 51 (see Fig. 2C) can be manufactured by changing the number of fuel holes according to the embodiment.

The elastic plate 60 may be located on the upper surface 52 (see FIG. 2C) of the ball guide 50. That is, the lower surface of the elastic plate 60 may be positioned to abut the upper surface (see FIG. 52) of the ball guide 50. The elastic plate 60 moves through the fuel hole 51 (see FIG. 2C) and serves to filter the foreign matter of the injected fuel.

The injector 1 manufactured by the above-described arrangements is connected to the armature 20 and the needle 30 connected to the armature 20, the needle 30 when the injection hole 301 (see Fig. 4) It should be manufactured considering the moving distance of the ball 40. That is, when power is supplied to the injector 1, the position of the armature 20, the needle 30, the ball 40, and the position of the armature 20, the needle 30, And the position of the ball 40 are taken into consideration. 4) and the upper surface 52 of the ball guide 50 when the injector 1 is manufactured in consideration of the distance described above, do.

The elastic plate 60 can not be fixed to the upper portion 52 of the ball guide 50 due to a predetermined distance between the lower surface 201 of the carrier 200 and the upper surface 52 of the ball guide 50 Further, since the carrier 200 and the valve seat 300 are to be assembled while maintaining the set distance, there is a problem in that an extra effort is required in manufacturing the injector 1.

FIG. 2A is a cross-sectional view illustrating a state in which a ball guide 50 and an elastic plate 60 are coupled to a valve seat 300 according to an embodiment of the present invention. FIG. 2B is a sectional view of the injector 1 according to an embodiment of the present invention. 2B is an enlarged perspective view of the ball guide 50 of the injector 1 according to the embodiment of the present technology.

2A shows a center plate 61 having a ball guide 50 in which a fuel hole 51 and a hollow hole 53 are formed in a valve seat 300 and a center hole 63 and a filtration hole 64 formed in a columnar shape. And the legs 62 are inserted and fixed. As shown in Fig.

2A, it can be confirmed that the ball guide 50 and the elastic plate 60 are stably fixed in the valve seat 300.

FIG. 2B is a perspective view of the elastic plate 60 of the embodiment of the present invention, in which a plurality of filtration holes 64 are formed in a circumferential direction, and a center plate 61 having a center hole 63 formed at the center thereof, The elastic plate 60 including the leg 62 formed by extending from the outer periphery of the center plate 61 to one side can be identified.

Here, the shape of the outer periphery of the center plate 61 is formed by the curved surface portion 66 and the straight portion 67.

The shape of the curved surface portion 66 and the straight line portion 67 can be press-fitted into the valve seat 300, as will be described later.

The above-described problem can be solved through the shape of the elastic plate 60.

The elastic plate 60 may be made of stainless steel. However, the elastic plate 60 is not only made of such a material but also can be made of a thin plate and can be made of any material having elasticity.

Here, the elastic plate 60 may be manufactured, for example, by a pressing process, and then the leg 62 may be manufactured by a bending process.

The center hole 63 formed in the center plate 61 of the elastic plate 60 may have a diameter similar to that of the hollow hole 53 of the ball guide 50. The center hole (63) of the elastic plate (60) serves to prevent the movement of the ball (40).

Here, a plurality of filtration holes 64 are formed in the center plate 61. The filtration holes 64 serve to filter the foreign substances of the fuel.

The shape of the outer periphery of the center plate 61 of the elastic plate 60 may be formed of a plurality of curved portions 66 and straight portions 67. That is, it may be a shape formed by cutting a part of the outer periphery of the circular plate.

The diameter of the elastic plate (60) is formed not to be at least smaller than the inner diameter of the valve seat (300).

The outer shape of the elastic plate 60 is press-fitted into the cylindrical valve seat 300 so as to be installed and fixed. The injector 1 of the present invention can be fixed to the upper portion 52 of the ball guide 50 only by inserting the elastic plate 60 into the valve seat 300 without any extra effort.

A plurality of filtration holes (64) are formed in the center plate (61) of the elastic plate (60).

Here, the shape characteristics of the plurality of filtration holes 64 will be described later.

2C is a view showing the ball guide 50. FIG. The ball guide 50 has a plurality of fuel holes 51 and a hollow hole 53 formed therein.

The top surface 52 of the ball guide 50 may be positioned with the filter 60.

A virtual straight line passing through the fuel hole 51 toward the center of one of the plurality of fuel holes 51 on the basis of the center of the upper surface 52 of the ball guide 50 The portion 51a where the circumferential surface of the fuel hole 51 first contacts the imaginary straight line and the imaginary straight line passes through the center of the fuel hole 51 and the circumferential surface of the fuel hole 51 There is a part 51b to be encountered.

The portion 51a where the circumferential surface of the fuel hole 51 first contacts the imaginary straight line and the portion where the imaginary straight line penetrates the center of the fuel hole 51 and comes into contact with the circumferential surface of the fuel hole 51 for the second time And a filter hole 64 formed in the circumferential direction between the first and second openings 51b. I will explain the contents hereafter.

3A is an enlarged view of the leg 62 of the elastic plate 60 of the injector 1 according to the embodiment of the present invention and Fig. 3B is a top view of the elastic plate 60 of the injector 1. Fig.

FIG. 3A is an enlarged view of the legs 62 of the elastic plate 60 according to an embodiment of the present technique.

The leg 62 can be divided into a top portion 62a, an intermediate portion 62b, and a bottom portion 62c.

The lowest portion 62c is connected to the center plate 61 and is formed protruding radially with a predetermined angle.

The intermediate portion 62b is formed to extend from the lowermost portion 62c and bent at the lowermost portion 62c to form a straight line.

The uppermost portion 62a is formed to extend from the intermediate portion 62b and is formed by bending in the axial direction at the intermediate portion 62b and bending at a predetermined angle.

The uppermost portion 62a of the elastic plate 60 legs 62 abuts the lower surface of the carrier 200, that is, the lower surface of the carrier lower surface 200 and the upper portion 52 of the ball guide 50 The legs 62 of the elastic plate 60 are elongated.

Here, the legs 62 of the elastic plate 60 are symmetrically formed with respect to the center of the center plate 61 of the elastic plate 60. That is, the leg 62 is formed on the opposite side of the one leg 62.

At least four or more legs 62 of the elastic plate 60 are formed. However, the leg 62 of the elastic plate 60 is not limited to four when the injector 1 is manufactured, and may be formed to be four or more or four or less.

3B is a top view of an elastic plate 60 formed in accordance with an embodiment of the present technique

Referring to FIG. 3B, the filtration hole 64 is closely examined.

Here, the filtration holes 64 are formed in the circumferential direction with respect to the center of the elastic plate 60. That is, the filtration hole 64 has a plurality of filtration holes 64 formed in a circumferential shape along one of the circumferences with respect to the center of the elastic plate 60.

Here, for convenience of description, the position of the filtration hole 64 formed in the circumferential direction nearest to the center hole 63 with respect to the center of the center hole 63 is defined as a first circumference, When the position of the filtration hole 64 formed in the circumferential direction is sequentially defined as the second circumference, it can be defined as the first circumference, the second circumference, the third circumference, and the fourth circumference in FIG. 3B. Here, the perimeter of the elastic plate 60 is not limited to the first to fourth peripheries, and may be changed depending on the injector 1 to be manufactured.

For convenience of explanation, the second circumference is defined as a reference circumference. Here, the reference circumference may be the first circumference, and may be the third circumference and the fourth circumference. That is, it is understood as a standard, but the second circumference will be referred to in the present specification.

The first perimeter, the second perimeter, the third perimeter, and the fourth perimeter are represented by dotted lines in Fig. 3B, respectively.

A plurality of filtration holes (64) around the reference are formed around the elastic plate (60) in a circumferential direction, and a plurality of filtration holes (64) are formed. Here, the filtration holes 64 are formed not to be connected to each other in succession but at a predetermined interval (filtration hole interval 65) between the filtration holes 64 and the filtration holes 64. (Filtration hole interval 65) between the adjacent filtration holes 64 formed around the reference with respect to one of the filtration holes 64. In other words,

If the filtration hole 64 is formed around the reference circumference (the second circumference) and the first circumference or the third circumference immediately adjacent to the reference circumference (the second circumference), it is preferable that the circumference (first circumference or third circumference) And a filtration hole 64 is formed in the immediate vicinity of the filtration hole 64 and the filtration hole 64. When the filtration hole 64 is formed in the immediate vicinity of the filtration hole 64 and the filtration hole 64, As shown in Fig.

That is, if there is a filtration hole 64 in the first circumference, a filtration hole interval 65 is formed in the second circumference, a filtration hole 64 is formed in the third circumference, and a filtration hole interval 65 is formed in the fourth circumference Format.

That is, the filtration hole 64 is formed so that the filtration hole spacing 65 formed around the reference and the filtration hole spacing 65 formed next to the circumference (the first perimeter or the third perimeter) do not overlap.

The filter hole 64 is required to filter the foreign matter of the fuel passing through the fuel hole 51 of the ball guide 50 and at the same time the unfiltered fuel must not be moved through the center hole 63, Should be formed in a certain range of the center plate (61) of the base plate (60).

2C and the position where the filtration hole 64 is formed will be described with reference to the center of the upper surface of the ball guide 50 as shown in FIG. A portion 51a where the straight line first faces the circumferential surface of the fuel hole 51 and this straight line pass through the center of the fuel hole 51 and then the fuel hole 51 for the second time, And a portion 51b which is in contact with the circumferential surface of the base portion 51b.

That is, the first circumference, the second circumference, the third circumference, and the fourth circumference described in FIG. 3B are formed between the imaginary straight line and the first meeting portion 51a of the fuel hole 51 and the second meeting portion 51b .

3C is a view of another embodiment of the elastic plate according to the present invention.

The elastic plate 60 according to another embodiment is similar in configuration and shape to the elastic plate according to the above-described embodiment, and therefore, the difference will be mainly described in the description.

The elastic plate 60 according to another embodiment is formed at an angle of 120 degrees with the legs 62 spaced apart from each other. So that it can have three legs 62.

The elastic plate 60 according to another embodiment may have a plurality of filtration holes 64 finely formed by an etching process. That is, the filter hole 64 is formed by the etching process to have a small diameter, so that foreign matter having a very small diameter can be also filtered.

The filtration holes 64 are formed in a plurality of positions except for a predetermined position in which the filtration holes are to be formed, that is, a circumferential portion of the center hole 63 of the elastic plate and a circumferential portion of the outer circumferential portion where the legs are formed.

The filtration hole 64 will be described with reference to FIG. 3C. For convenience of explanation, a portion of the elastic plate is enlarged, and a portion where the filtration hole 64 is formed in the middle portion is referred to as a reference portion, a portion where any dotted line above the reference portion is formed 1 ", and a portion formed with an arbitrary dotted line below the reference portion will be referred to as a second portion.

At least four filtration holes 64 may be formed along the above-mentioned portions. Here, it is a matter of course that the number of the four filtration holes 64 is four.

When the reference portion is viewed from right to left using FIG. 3C, it can be seen that the filtration hole interval 65 and the filtration hole 64 are formed alternately.

That is, from the left to the right, the filtration hole interval 65, the filtration hole 64, the filtration hole interval 65, and the filtration hole 64 are formed in this order.

It can be seen from FIG. 3 (c) that the filtration hole interval 65 and the filtration hole 64 are formed in the same manner as the reference portion in the first and second portions.

However, it can be seen that the first portion and the second portion are staggered from the reference portion when the reference portion is taken as a reference, and the filtration hole 64 and the filtration hole gap 65 are formed. That is, when the filtration hole 64 is formed in the reference portion, the filtration hole interval 65 is formed in the first portion and the second portion, and the filtration hole 64 is formed in the reference portion, .

The filtering holes 65 are formed through the filter holes 64 and the filter hole intervals 65 so as to filter the foreign substances. Therefore, the elastic plate 60 according to another embodiment has an excellent effect of filtering foreign matter.

Here, it should be noted that the reference portion and the first and second portions are not fixed but are arbitrarily referred to. That is, the first part may be a reference part, the upper part of the first part may be the first part, and the lower part may be the second part. As described above, it can be seen that the reference portion and the filtration hole 64 in the first and second portions are not overlapped with the filtration hole spacing 65, .

4 is an enlarged view of the lower portion of the injector 1 according to the embodiment of the present invention.

4 shows the combined state of the carrier 200 and the valve seat 300 and shows the needle 30 and the ball 40, the ball guide 50, the elastic plate 60 and the like.

Here, the leg 62 of the elastic plate 60 may be formed in the shape of a leaf spring having an elastic force.

The legs 62 of the elastic plate 60 may be formed on the straight portion 67 of the center plate 61 in such a shape as to protrude from the outermost portion of the center plate 61.

4, the fixing of the elastic plate 60 according to the combination of the carrier 200 and the valve seat 300, which is an embodiment of the present technology, and the setting of the lower portion of the carrier 200 and the upper portion 52 of the ball guide 50 Looking at the distance maintenance method,

A ball guide 50 is press-fitted into the valve seat 300, and an elastic plate 60 is press-fitted thereon.

Here, the diameter between the intermediate portion 62b (see Fig. 3A) of the symmetrical elastic plate 60 legs 62 is formed not to be at least smaller than the inner diameter of the valve seat 300. Therefore, when the elastic plate 60 is inserted into the valve seat 300, the diameter between the middle portion 62b (see FIG. 3A) of the symmetrical elastic plate 60 leg 62 is smaller than the diameter of the valve seat 300 Is inserted in a state smaller than the inner diameter. The elastic plate 60 of the present invention is formed of a material having elasticity so that the leg 62 of the elastic plate 60 has an elastic action to return to the original diameter length and the upper portion of the ball guide 50 And the lower surface 200 of the carrier.

The top portion 62a of the elastic plate 60 leg 62 also abuts the bottom surface 201 of the carrier 200 when the valve seat 300 is assembled to the carrier 200 .

The uppermost portion 62a of the elastic plate 60 leg 62a is formed at a predetermined angle in the axial direction as described above. The uppermost portion 62a of the elastic plate 60 is in contact with the lower surface 200 of the carrier, When the carrier 200 is bent at an angle larger than the original bending angle, the carrier lower surface 200 and the ball guide 50 ) Upper portion 52 (see Fig. 2C). That is, the legs 62 of the elastic plate 60 of the present technology are supported by the lower portion of the carrier to provide elastic force to the ball guide 50.

Referring to FIG. 4, when the valve seat 300 and the carrier 200 according to the present invention are assembled, the elastic plate 60 including the legs 62 formed as elastic means, 2C) between the lower surface 200 of the carrier and the upper surface 52 (see FIG. 2C) of the ball guide 50 by inserting the valve seat 300 into which the ball guide 50 and the elastic plate 60 are inserted, The elastic plate 60 can be stably fixed to the upper surface 52 (see FIG.

5 is a view showing a step of manufacturing the injector 1 according to the embodiment of the present invention.

The method of manufacturing the injector 1 according to the present embodiment includes the step of manufacturing the elastic plate 60, the step of pressing the ball guide 50, the step of fixing the elastic plate 60 (S300) ) Assembling step S400.

The elastic plate 60 is manufactured in a step S100 including a center hole 63 and a plurality of filtration holes 64 formed in a circumferential direction and having an outer shape including a curved portion 66 and a straight portion 67 And a lowermost portion 62c protruding in one direction from the center plate 61 and formed at a predetermined angle in the radial direction at the center plate 61 and a lowermost portion 62c, And a leg 62 formed of an intermediate portion 62b formed in the intermediate portion 62b and an uppermost portion 62a formed in the intermediate portion 62b to maintain an angle set in the axial direction . Such an elastic plate can be manufactured by a pressing process as described above, and the leg can be manufactured by a bending process.

The ball guide 50 press-fitting step S200 is a step of press-fitting the ball guide 50 into the valve seat 300 formed in a cylindrical shape having an inner space and an upper portion opened.

The elastic plate 60 is fixed in step S300 by pressing the ball guide 50 into the valve seat 300 and then pressing the elastic plate 60 into position on the upper surface 52 of the ball guide 50 .

The valve seat 300 assembling step S400 is a step of press-fitting the valve seat 300 to which the ball guide 50 and the elastic plate 60 are fixed, into the carrier 200.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit of the invention, It will be apparent to those of ordinary skill in the art.

1: Injector 10: Solenoid part
20: Amateur 30: Needle
40: Ball 50: Ball Guide
51: fuel hole
51a: the portion where the straight line first contacts with the peripheral surface of the fuel hole
51b: a portion where the straight line meets the circumferential surface of the fuel hole for the second time
52: upper part of the ball guide or upper surface of the ball guide 53: hollow hole
60: Elastic plate 61: Center plate
62: Leg 62a:
62b: intermediate portion 62c: lowest portion
63: center hole 64: filtration hole
65: Filtration hole spacing 66:
67: straight section 100: housing
200: Carrier 201: Lower side of the carrier
300: valve seat 301: injection hole

Claims (12)

A housing having a space therein;
A carrier having a space formed in the center in the longitudinal direction and coupled to the lower portion of the housing;
A solenoid unit disposed in the housing and generating magnetic force according to a control power supplied thereto;
An armature that linearly moves according to a magnetic force of the solenoid portion;
A needle positioned in a central space of the carrier and performing a linear motion according to a linear motion of the armature;
A ball linearly moved by the needle;
A plurality of injection holes are formed in the lower portion, and the injection holes are opened and closed in accordance with the linear motion of the balls. Valve seat;
Wherein a plurality of fuel holes are formed in the valve seat so as to move the fuel and a hollow hole through which at least a part of the ball is radially inward with respect to the fuel hole is formed to guide the linear movement of the ball Ball guide; And
A center plate having a plurality of filtration holes formed at positions corresponding to the plurality of fuel holes and filtering the foreign substances of the fuel, one end being supported by the lower portion of the carrier and abutting the upper portion of the ball guide, An elastic plate including an elastic portion which can be stably fixed despite the gap formed between the guides;
. ≪ / RTI >
The method according to claim 1,
The elastic portion of the elastic plate
Wherein the leg is formed by a plurality of bends extending in an upward direction from the center plate and the legs are resiliently formed by bending as they are supported by the lower surface of the carrier.
3. The method of claim 2,
Wherein the plurality of legs of the elastic plate comprises:
An intermediate portion abutting against the inner surface formed in the valve seat inner space, and a top portion bending axially in the intermediate portion to abut the lower surface of the carrier,
Wherein the elastic plate is fixed to the space inside the valve seat so that the diameter between the intermediate portions is not less than the inner diameter of the valve seat.
The method of claim 3,
Wherein the plurality of legs of the elastic plate comprises:
When the uppermost portion abuts the lower surface of the carrier and is bent at an angle larger than the original bending angle, an elastic action is performed to maintain the original bending angle, thereby stably fixing the lower portion of the carrier and the upper portion of the ball guide The injector comprising:
3. The method of claim 2,
Wherein the center plate of the elastic plate
Wherein an outer shape is formed by a plurality of curved portions and a straight portion formed between the plurality of curved portions,
Wherein the elastic plate is formed to be press-fit and fixed when the elastic plate is installed in the valve seat having a cylindrical inner space.
3. The method of claim 2,
Wherein the elastic plate comprises:
Characterized in that it is made of stainless steel.
3. The method of claim 2,
Wherein the plurality of legs of the elastic plate comprises:
Wherein the center plate is formed symmetrically with respect to the center of the center plate, and at least four or more are formed.
3. The method of claim 2,
Wherein the center plate of the elastic plate
A center hole through which the ball passes is formed in a central portion, a plurality of filtration holes are formed between the center hole and the outermost periphery,
Wherein the plurality of filtration holes
The filter plate is formed in a circumferential direction while maintaining a predetermined length with respect to the center of the elastic plate. The filter plate is formed in a state in which a predetermined filtering hole interval is provided between a filtration hole and a filtration hole formed around a reference, And a gap between the holes and the filtration holes is set,
Wherein a predetermined filtering hole interval formed around the reference and a predetermined filtering hole interval formed next to the reference hole are formed so as not to overlap with each other.
9. The method of claim 8,
Wherein the plurality of filtration holes formed by the etching process are formed in the reference portion in an intersecting relation to the filtration hole interval, the filtration holes formed in the first portion that is the upper portion of the reference portion and the second portion that is the lower portion, And is formed so as not to overlap with the filtration hole interval.
10. The method according to claim 8 or 9,
The filtration hole
When a virtual straight line is drawn in the center direction of one of the plurality of fuel holes with respect to the center of the top surface of the ball guide so as to filter foreign substances of fuel passing through the plurality of fuel holes of the ball guide, Wherein the fuel hole is formed in a circumferential direction between a straight line and a first contact portion between the circumferential surface of the fuel hole and a length of a portion where the straight line overlaps a second circumferential surface of the fuel hole.
3. The method of claim 2,
The diameter of the valve seat hollow hole
Wherein the guide is formed so as not to be at least smaller than the diameter of the ball so as to guide the movement of the straight line when the ball moves.
A plurality of filtering holes formed in the circumferential direction, a center plate formed with a curved surface portion and a straight line portion, and a central plate formed in a shape protruding in one direction from the center plate, An elastic plate manufacturing step of manufacturing an elastic plate composed of a plurality of legs constituted including a top portion which is made up of a plurality of legs;
A ball guide press-fitting step for pressing and inserting a ball guide into a valve seat formed in a cylindrical shape with an upper space opened therein;
An elastic plate fixing step of pressing the elastic plate into the valve seat and fixing the elastic plate on the ball guide upper surface after the ball guide press-fitting step; And
A valve seat assembling step of press-fitting the valve seat having the ball guide and the elastic plate fixed thereto into the carrier;
Wherein the injector comprises a plurality of injectors.
KR1020150180328A 2015-12-16 2015-12-16 Injector having an elastic plate KR101796562B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2582013A (en) * 2019-03-08 2020-09-09 Delphi Tech Ip Ltd Fuel injector valve seat arrangement
KR102255167B1 (en) * 2020-02-26 2021-05-25 영인콘트롤 주식회사 A filter combination structure of a solenoid valve assembly for heat water control
KR102338630B1 (en) * 2020-07-03 2021-12-13 주식회사 현대케피코 Fuel injector with filter for internal foreign matters and method for assembling the fuel injector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090121049A1 (en) 2007-11-13 2009-05-14 Flynn Vicki A Internal lower fuel injector filter
US20090236448A1 (en) 2008-03-18 2009-09-24 Kimberly Burkhard Fuel injector lower filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2582013A (en) * 2019-03-08 2020-09-09 Delphi Tech Ip Ltd Fuel injector valve seat arrangement
KR102255167B1 (en) * 2020-02-26 2021-05-25 영인콘트롤 주식회사 A filter combination structure of a solenoid valve assembly for heat water control
KR102338630B1 (en) * 2020-07-03 2021-12-13 주식회사 현대케피코 Fuel injector with filter for internal foreign matters and method for assembling the fuel injector

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