WO2005031155A1

WO2005031155A1 - Injection plug, method of producing the plug, and fuel injection valve

Info

Publication number: WO2005031155A1
Application number: PCT/JP2004/014315
Authority: WO
Inventors: Akimichi Koide
Original assignee: Celltec Project Management Co., Ltd.
Priority date: 2003-09-25
Filing date: 2004-09-22
Publication date: 2005-04-07
Also published as: JP2005098196A; TW200516204A

Abstract

An injection plug for injecting a liquid has a sleeve receiving base as a member that has a plate-like section in which a through-hole penetrating between the front face and the back face is provided and has a sleeve as a shaft body that has a hole penetrating along the axis and whose outer peripheral section is fitted in the through-hole, and the hole in the sleeve is an injection hole for injecting the liquid. The structure above enables to provide an injection plug having a high degree of freedom in production, excellent workability, and easiness to maintain accuracy; an injection valve in which the injection plug is assembled; and method of producing the same.

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an injection plug for injecting a fluid. Particularly, the present invention relates to an injection plug which is characterized by a manufacturing process of an injection plug and is suitable for being incorporated in a fuel injection valve of an engine, and a method of manufacturing a fuel injection valve incorporating the injection plug. BACKGROUND ART Injecting plugs are used in industry to inject fluids.

For example, in a diesel engine, fuel is injected directly into the high-temperature air in the combustion chamber obtained by the compression process of the piston, causing self-ignition and burning the fuel. Fuel injectors with injection plugs are used to inject fuel into the combustion chamber. The output of the engine is adjusted by adjusting the amount of fuel injected by the fuel injection valve into the combustion chamber.

In diesel engines, a fuel injection device called the common rail system is used to control exhaust gas. In the common rail system, high-pressure fuel is injected into the combustion chamber by an injection valve to make the fuel particles finer, improving the combustion state and reducing the amount of black smoke emitted. In order to effectively reduce graphite, it is necessary to adjust the back pressure of the injection nozzle appropriately. For this purpose, the back pressure is detected and adjusted by a sensor, and the injection timing and injection amount are optimized by electronic control.

Furthermore, by making the injection holes of the injection nozzle ultra-fine, particles of fuel injected into the combustion chamber are reduced, and optimal combustion is promoted. Hereinafter, the structure of a conventional injection nozzle will be described.

The tip of the injection nozzle is composed of a filter. Phil Yu is a plate with many small diameter prize holes (this is called an orifice plate). For example, The orifice plate is a disk-shaped metal plate provided with a 0.125 mm through-hole at the position of 1. 2. The orifice plate is manufactured by forming a small-diameter through hole in a metal plate by pressing and then performing a process of increasing hardness. Since the through-hole was opened by a press, the diameter could not be made too small compared to the thickness of the metal plate, and it was based solely on the skill of the operator. Further, the shape of the through hole is limited, and it was impossible to further improve the accuracy of the shape and size of the through hole. Fuel injectors are used in gasoline engines. The fuel injection valve injects fuel into the intake manifold or the combustion chamber.

In the direct injection type fuel injection system, which injects fuel directly into the combustion chamber, the size and material of the metal plate of the orifice plate are limited because the orifice plate is directly exposed to the combustion gas in the combustion chamber. This made it more difficult to control the shape and dimensions of the through-holes.

In addition, for example, in order to drill 12 0.125 mm through holes in a metal plate, strict assembly and adjustment of a press die were necessary, and work efficiency could not be improved further. As described above, in the conventional method of manufacturing an injection plug for a fuel injection valve, the shape or dimensions of the injection holes can be freely selected, the dimensional accuracy can be improved, the material can be freely selected, or the workability can be improved. It was difficult to improve. The present invention has been devised in view of the above-described problems. Instead of a conventional injection plug and a fuel injection valve provided with the injection plug, the present invention has a high degree of freedom in manufacturing, good workability, and An injection plug that can easily maintain accuracy, a fuel injection valve incorporating the injection plug, and a manufacturing method thereof are provided. Disclosure of the invention In order to achieve the above object, an injection plug for injecting a liquid according to the present invention is provided with a sleeve receiving base, which is a member having a plate-like portion provided with a through-hole penetrating a back surface and a front surface; A sleeve that has a through hole and an outer peripheral portion is a shaft fitted into the through hole, and the hole is an injection hole for injecting a liquid.

According to the configuration of the present invention, the plate portion of the sleeve receiving base is provided with a through hole penetrating the back surface and the front surface, and the sleeve has a hole penetrating along the axis, and the outer peripheral portion is fitted into the through hole. And since the said hole is an injection hole which injects a liquid, when a liquid is supplied to the back of the said plate-shaped part, a liquid will inject from the front side of a hole. Hereinafter, some embodiments of the present invention will be described. The present invention includes aspects in which any of the embodiments described below, or a combination of two or more thereof. In the injection plug according to the embodiment of the present invention, at least one of the through hole and the outer peripheral portion may be tapered.

According to the configuration of the above embodiment, at least one of the through hole and the outer peripheral portion is tapered, so that the sleeve fits tightly into the through hole of the sleeve receiving base. In the spray plug according to the embodiment of the present invention, the sleeve is manufactured by attaching metal to the outer periphery of a core wire by an electroforming method, and the hole is a mark where the core wire is removed. You may.

According to the configuration of the above-described embodiment, the sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electrolysis method, and since the hole is a mark where the core wire is removed, a desired shape and dimensions are obtained. An injection plug having a hole can be easily formed. In order to achieve the above object, a fuel injection valve for injecting fuel in accordance with a signal according to the present invention is provided with a sleeve receiving base, which is a member having a plate-like portion provided with a through-hole penetrating a back surface and a front surface, and a shaft. An injection plug having a sleeve that is provided with a hole penetrating along the core and having an outer peripheral portion that is a shaft fitted into the through hole, wherein the hole is an injection hole for injecting a liquid; And a fuel injection valve main body to be supplied to the back of the injection plug.

According to the configuration of the present invention, the injection plug has a sleeve receiving base, which is a member having a plate-like portion provided with a through-hole penetrating the back surface and the front surface, and a hole provided through the axial center and having an outer periphery. A sleeve which is a shaft fitted into the through hole, wherein the hole is an injection hole for injecting a liquid, and the fuel injection valve body supplies fuel to the back surface of the injection plug according to a signal. Therefore, fuel can be injected from the front side of the hole of the injection plug according to the signal. Hereinafter, some embodiments of the present invention will be described. The present invention includes aspects in which any of the embodiments described below, or a combination of two or more thereof. In the injection plug of the fuel injection valve according to the embodiment of the present invention, at least one of the through hole and the outer peripheral portion may be tapered.

According to the configuration of the above-described embodiment, at least one of the through hole and the outer peripheral portion is tapered, so that the sleeve cap S is securely fitted into the through hole of the sleeve receiving base. In the injection plug of the fuel injection valve according to the embodiment of the present invention, the sleeve is manufactured by attaching a metal to the outer periphery of a core wire by an electrodeposition method, and the hole is a mark where the core wire is removed. You may.

According to the configuration of the above-described embodiment, the sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electrolysis method, and since the hole is a mark where the core wire is removed, a desired shape and dimensions are obtained. A fuel injection valve having a hole can be easily manufactured. In order to achieve the above object, a method for manufacturing a jet plug for jetting liquid according to the present invention is provided by preparing a sleeve receiving base, which is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A sleeve receiving base preparing step, a sleeve preparing step of preparing a sleeve which is a shaft having a hole penetrating along the axis, and an outer peripheral portion of the tf sleeve is inserted into the through hole of the sleeve receiving base. And a sleeve fitting step of inserting and fitting, wherein the hole is an ejection hole for ejecting a liquid. According to the configuration of the present invention, in the sleep cradle preparation step, a sleeve cradle, which is a member having a plate-like portion provided with a through-hole penetrating the back surface and the front face, is prepared. A sleeve, which is a shaft having a through hole, is prepared, and the outer peripheral portion of the sleeve is inserted into and fitted into the penetrating sieve of the sleeve receiving stand, and the hole is an ejection hole for ejecting a liquid. When the liquid is supplied to the rear surface, an injection plug can be manufactured in which the liquid is injected from the front side of the hole. In order to achieve the above object, a method for manufacturing a jet plug for jetting liquid according to the present invention is provided by preparing a sleeve receiving base, which is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A sleeve pedestal preparation step, and a sleeve preparation step of preparing a sleeve which is manufactured by attaching metal to the outer periphery of the core wire by an electrode method and has a hole penetrating along the axis and having the core wire clogged, A sleeve fitting step of inserting an outer peripheral portion of the sleeve into the through hole of the sleeve receiving base and fitting the sleeve, and a core wire removing step of removing the core wire from the sleeve. The removed hole is a spray hole for spraying the liquid. According to the configuration of the present invention, in the sleeve receiving base preparing step, a sleeve receiving base, which is a member having a plate-like portion provided with a through-hole penetrating the back surface and the front face, is prepared. Then, a sleeve, which is manufactured by attaching a metal to the outer periphery of the core wire and has a hole penetrating along the axis and having the core wire clogged, is prepared, and in a sleeve fitting step, the outer peripheral portion of the sleeve is formed as described above. The core wire is removed from the sleeve in the core wire removing step in the core wire removing step, and the hole from which the core wire is removed is an injection hole for injecting a liquid. An injection plug having a hole having a shape and dimensions can be easily formed. In order to achieve the above object, a method of manufacturing a jet plug for jetting a liquid according to the present invention is provided by preparing a sleeve receiving base which is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A sleeve pedestal preparation step; and a sleeve preparation step of preparing a sleeve, which is manufactured by attaching metal to the outer periphery of the core wire by an electrolysis method and penetrates along the axis and has a hole filled with the core wire. A sleeve fitting step of inserting and fitting an outer peripheral portion of the sleeve in which the core wire is clogged into the hole into the through hole of the sleeve receiving base; and fitting the sleeve into the sleeve receiving base. A core wire removing step of removing the core wire from the sleeve. The removed hole is a spray hole for spraying the liquid.

According to the configuration of the present invention, in the sleeve receiving stage preparing step, a sleeve receiving stage, which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface, is prepared. A sleeve which is manufactured by attaching a metal to the outer periphery of the shaft and has a hole penetrating along the axis and having the core line clogged is prepared, and the sleeve having the core line clogged in the hole in a sleeve fitting step. The outer peripheral portion of the sleeve is inserted into the through hole of the sleeve receiving base and fitted therein, and the core wire is removed from the sleeve fitted to the sleeve receiving base in the core wire removing step. Since it is an injection hole that injects liquid, it can easily create an injection plug with holes of the desired shape and dimensions. In order to achieve the above object, a method for manufacturing a jet plug for jetting liquid according to the present invention is provided by preparing a sleeve receiving base, which is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A sleep cradle preparation step; and a sleeve preparation step of preparing a sleeve which is manufactured by attaching metal to the outer periphery of the core wire by an electro-conductive method and has a hole penetrating along the axis and having the core wire buried therein. A sleeve fitting step of inserting the sleeve in which the core wire is clogged in the hole into the through hole of the sleeve receiving base to fit therein; and the sleeve integrated with the sleeve in which the core wire is clogged in the hole. A spray plug forming step of forming the front and back surfaces of the plate-shaped portion of the sleeve support, and a core removing step of removing the core from the sleeve fitted to the sleeve support. core The hole from which the line was removed was the injection hole for ejecting the liquid.

According to the configuration of the present invention, in the sleeve receiving stage preparing step, a sleeve receiving stage, which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface, is prepared. Preparing a sleeve which is manufactured by attaching a metal to the outer periphery of the shaft and having a hole penetrating along the axis and having the core wire buried therein, wherein the core wire is filled with the core wire in a sleeve fitting step. Is inserted into the through hole of the sleeve receiving base and fitted into the through hole, and the plate-shaped portion of the sleeve receiving base integrated with the sleeve with the core force S filled in the hole in the injection plug forming step. The front and rear surfaces of the core are removed, and the core is removed from the sleeve fitted to the sleeve support in the core removal step. Since the hole from which the core is removed is an injection hole for injecting a liquid, Need process Without injection bra having a hole having a desired shape and dimensions Can be easily created. Hereinafter, embodiments of the present invention will be described. The method for manufacturing an injection plug according to the embodiment of the present invention may include a sleeve processing step of forming a taper on an outer peripheral portion of the sleeve.

According to the configuration of the above embodiment, a taper is formed on the outer peripheral portion of the sleeve, so that the sleeve fits tightly into the through hole of the sleeve receiving base. In order to achieve the above object, a method for manufacturing a fuel injection valve for injecting fuel according to a signal is provided by: a method for manufacturing an injection plug according to the method for manufacturing an injection plug according to the above; A fuel injection valve body for supplying fuel to a rear surface of the fuel injection plug in accordance with a signal. According to the configuration of the present invention, the injection plug is manufactured by the injection plug manufacturing method described above in the injection plug manufacturing process, and the injection plug is installed in the fuel injection valve main body in the injection plug installation process. ^ Since fuel is supplied to the back of the injection plug according to the signal, an injection plug having a hole having a desired shape and dimensions can be easily formed. As described above, the injection plug of the present invention for injecting a liquid has the following effects by its configuration.

The sleeve provided with a hole penetrating along the axis fits into the through hole provided in the sleeve support, and the hole is an ejection hole for ejecting liquid. Liquid is ejected from the front side of the hole.

Also, since at least one of the through hole and the outer periphery 咅 is tapered, the sleeve fits tightly into the through hole of the sleeve receiving base.

In addition, since the sleeve is manufactured by attaching metal to the outer periphery of a core wire by an electro-deposition method, and the hole is a mark after removing the core wire, an injection hole having a desired shape and dimensions is provided. You can easily make a plug ^? Further, as described above, the fuel injection valve that injects fuel according to the signal of the present invention has the following effects due to its configuration.

The injection plug force of the fuel injection valve has an S-sleeve pedestal and a sleeve, and a sleep provided with a hole penetrating along the axis fits into a through-hole provided in the sleeve pedestal, and the hole Is an injection hole for injecting liquid, so when liquid is supplied to the back, the liquid is injected from the front side of the hole.

In addition, since at least one of the through hole and the outer peripheral portion is provided with a taper, the sleeve fits tightly into the through hole of the sleeve receiving base.

Further, since the sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electro-deposition method, and the hole is a mark after removing the core wire, a fuel injection having a hole of a desired shape and size is provided. The valve can be easily made. Further, as described above, the method of the present invention for producing a jet plug for jetting a liquid has the following effects due to its configuration.

A sleeve receiving base having a through hole penetrating the back and the front and a sleeve having a hole penetrating along the axis are prepared.The sleeve is inserted into the through hole of the sleeve receiving base and fitted. Since the hole is formed as a nozzle hole for ejecting liquid, it is possible to manufacture an injection plug in which liquid is ejected from the front side of the hole when the liquid is supplied to the rear surface.

A sleeve, which is manufactured by depositing metal around the core wire by an electrode method and has a hole penetrating along the axis and having a hole filled with the core wire, is prepared. Since the hole from which the core wire is removed is used as an injection hole for injecting liquid, the injection plug having a hole with a desired shape and dimensions can be easily formed. Can be

Prepare a sleeve, which is a shaft body that is manufactured by attaching metal to the circumference of the core wire by an electro-deposition method and has a hole that penetrates along the axis and has the core wire clogged. And press-fit into a through-hole penetrating the other surface from the other surface to remove the core wire, and the hole from which the core wire has been removed is used as an injection hole for jetting liquid, so that a hole having a desired shape and size is formed. It is possible to easily make a spray plug with it.

Manufactured by attaching metal around the core wire by electrodeposition and penetrating along the axis A sleeve, which is a shaft having a clogged hole, is prepared, and a sleeve with a clogged core wire is press-fitted from one surface of the sleeve receiving base to the other surface through a through-hole, and fitted. After molding the back and front surfaces of the sleeve receiving unit integrated with the core, the core wire is removed, and the hole from which the core wire has been removed is used as an ejection hole for ejecting liquid, so that an extra post-process is required. The injection plug with the desired shape and dimensions can be easily made without the need.

Since the outer peripheral portion of the sleeve is tapered, the sleeve fits tightly with the through hole of the sleeve receiving base. Further, as described above, the method of the present invention for producing a fuel injection valve for injecting fuel in accordance with a signal has the following effects due to its configuration.

Since the fuel injection valve is manufactured by incorporating the injection plug manufactured by the above manufacturing method, it is possible to easily manufacture the fuel injection valve that injects the fuel according to the signal.

Therefore, it is possible to provide an injection plug having a high degree of freedom in manufacturing, good workability, and easily maintaining accuracy, a fuel injection valve provided with the injection plug, and a method of manufacturing the same. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a fuel injection valve and an injection plug according to an embodiment of the present invention.

FIG. 2 is a flowchart of the method for manufacturing the injection plug according to the embodiment of the present invention. FIG. 3 is an explanatory diagram of the method for manufacturing the injection plug according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a method for manufacturing an injection plug according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of use of the fuel injection valve according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted. Structure of an injection plug according to a first embodiment of the present invention and a fuel injection valve provided with the injection plug The construction will be described. FIG. 1 is a sectional view of a fuel injection valve and an injection plug according to an embodiment of the present invention. FIG. 5 is an explanatory diagram of use of the fuel injection valve according to the embodiment of the present invention. First, the injection plug 1 according to the embodiment of the present invention will be described.

The injection plug 1 is for injecting a liquid, and includes a sleeve 10 and a sleeve receiving base 20.

The sleep cradle 20 is a member having a plate-like portion provided with the through-hole 21. The penetrating portion 21 penetrates the back surface 22 and the front surface 23 of the plate portion.

The through hole 21 may be a rectilinear hole having a circular cross section. For example, the through hole 21 is finished by a straight reamer or a taper reamer after being prepared by a drill. When the outer periphery of the sleeve 10 is tapered, the through hole 21 may be finished with a streamer.

The material of the sleeve cradle is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and nickel composite. Nickel composites are nickel-based composites, for example, a mixture of nickel and gay carbide (SiC).

The sleeve cradle may be manufactured by cutting one of stainless steel, free-cutting steel, SK steel, and SKS steel, or may be manufactured by forming nickel or a nickel composite material by an electroforming method. .

If the sleeve cradle is manufactured by the electronic method, the material of the sleeve cradle may be nickel or a nickel composite material. The sleeve 10 is a shaft body having a hole 2 penetrating along the axis. The outer peripheral portion is fitted into the through hole 21, and the hole 2 is an injection hole 2 for injecting a liquid.

The sleeve 10 is preferably a circular hollow shaft. A taper may be provided on the outer periphery of the sleeve 20. In the case where the taper is provided on the outer peripheral portion, the diameter at the front when the sleeve 20 is inserted into the through hole may be smaller than the diameter at the rear.

Further, the sleeve 10 is manufactured by attaching a metal to the outer periphery of the core wire 7 by an electrolysis method, and the hole may be a mark where the core wire 7 is removed. Especially when nickel is deposited by electroplating, the transferability is good, so that a hole with a clean inner wall can be formed. The material of the sleeve 10 is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and Nigel composite. The nickel composite is a composite material based on nickel, for example, a mixture of nickel and gallium sulfide (SiC). Next, the fuel injection valve 8 according to the embodiment of the present invention will be described.

The fuel injection valve 8 injects fuel in accordance with a signal, and is composed of a fuel injection valve body 30 and an injection plug 1.

The fuel injection valve 8 is attached to, for example, a cylinder head of the engine, and a front surface 23 of the injection plug 1 is exposed to a combustion chamber.

Fuel injection valve main body 30 «: A high-pressure fuel is supplied to the back of the injection plug 1 in accordance with a signal. The frame 3 L, the actuator 32, the valve 33, the fuel passage 34, and the fuel chamber 35 are provided. It is composed of

The frame 31 is a main structure of the fuel injection valve body 30 and forms a fuel passage 34 and a fuel chamber 35 inside.

Fakche I-32 is a mechanical element driven by a signal to open and close valve 33.

The valve 33 opens and closes a portion connecting the fuel passage 34 and the fuel chamber 35.

When the valve 33 opens the valve 33, the fuel passage 34 communicates with the fuel chamber 35, and high-pressure fuel flows to the fuel chamber 35. The injection plug 1 is for supplying high-pressure fuel to the back side and injecting fuel to the front side, and has the structure described above. The outer edge of the injection plug 1 is fixed to the frame 31. The back 22 of the injection plug faces the fuel chamber 35. When the air conditioner 32 opens the valve 33, high-pressure fuel flows into the fuel chamber 35 through the fuel passage 34. The fuel that has flowed into the fuel chamber 35 is injected into the space on the front side 23 through the injection hole 2 of the injection plug 1.

Since the front face 23 of the injection plug 1 is exposed to the combustion chamber of the engine, fuel is injected into the combustion chamber of the engine, and the fuel injection mist fills the combustion chamber.

The fuel is ignited by a spark plug or self-ignited, and expands while burning, causing the engine to expand. Next, a method of manufacturing the injection plug according to the first embodiment of the present invention will be described. FIG. 2 is a flowchart of the method for manufacturing the injection plug according to the embodiment of the present invention. FIG. 3 is an explanatory diagram of the method for manufacturing the injection plug according to the first embodiment of the present invention.

The method of manufacturing the injection plug according to the first embodiment is a method of manufacturing an injection plug that injects a liquid, the method including a sleeve preparation step S11, a sleeve processing step S12, and a sleeve cradle preparation step S13. And a sleeve fitting step S14, an injection plug forming step S15, and a core wire removing step S16.

For example, the plurality of injection holes 2 are provided in parallel with the injection plug 1. Sleeve preparation step S11 is a step of preparing the sleeve 10. Here, the sleeve 10 is a shaft having a hole penetrating along the axis.

The metal is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and nickel composite.

A sleeve may be prepared by attaching metal to the outer periphery of the core wire 7 by an electrode method and penetrating along the axis and having a hole filled with the core wire. When the sleeve 10 is manufactured by the electrode method, it is possible to easily manufacture a sleep having a hole having an arbitrary size and shape by selecting the size and shape of the core wire. The core wire is a conductive wire at least on the surface. The core wire is, for example, a piano wire. The material of the core wire may be, for example, one of iron, steel, stainless steel, tungsten, nickele, and a nickel alloy. Further, nickel plating or copper plating may be applied to the surface of the core wire. Further, molybdenum powder may be applied to the surface of the core wire. By doing so, the core wire can be easily removed in the core wire removing step described later.

When manufactured by an electrodeposition method, the metal may be nickel or a nickel composite material. Nickel composites are nickel-based composites, for example, a mixture of nickel and silicon carbide (SiC).

The sleeve 10 may be passed through a threadless processing machine to improve the accuracy of the size and shape of the outer peripheral portion. The sleeve processing step S 12 is a step of forming a taper on the outer peripheral portion of the sleeve 10. The degree of the taper is selected, for example, between 1100 and 5100.

With the Sen-Yu Rescaloe machine, simply adjusting the inclination of the rotating shaft of the processing machine improves the size and shape accuracy of the outer periphery, and at the same time, easily tapes the outer periphery of the sleep 10 be able to. The sleeve receiving unit preparing step S13 is a step of preparing the sleep receiving unit 20. Here, the sleep cradle 20 is a member having a flat plate portion provided with a through hole 21 penetrating the back surface 22 and the front surface.

The sleeve support 20 may be formed by processing a metal material with a cutting machine.

The metal material is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and nickel composite. Nickel composites are nickel-based composites, for example, a mixture of nickel and silicon carbide (SiC).

The through-hole 2 I may be a rectilinear hole having a circular cross section. For example, the through hole 21 is finished by a straight reaming or a taper reaming after being prepared with a drill. When taper processing is performed on the outer peripheral portion of the sleeve 10, the through hole 21 may be finished by a straight reamer. The sleeve fitting step S14 is a step of inserting the outer peripheral portion of the sleeve 10 into the through hole 21 of the sleeve receiving base 20 and fitting it.

When the sleeve 10 is press-fitted with a predetermined force, the outer peripheral portion of the sleeve 10 fits into the through hole 21.

The sleeve 10 having a tapered outer peripheral portion may be press-fitted from the front side with the side having the smaller diameter of the taper first. In this way, when the injection plug is used to inject fuel into the combustion chamber of the engine, the sleeve may fall out of the through hole even if the pressure of the combustion gas in the combustion chamber acts on the front side of the sleeve. There is no. Injection plug molding process S 15 is a plate of sleeve support 20 integrated with sleeve 10 This is a step of forming the back and front of the shape. In this step, a crane in which the core wire 7 is filled in the hole 2 may be used. In this way, it is possible to prevent the shape and dimensions of the hole 2 from being changed during the working process, and to prevent the need for an extra post-process. Core wire removing step S16 is a process of removing the core wire 2 from the sleeve. In this step, the sleeve 10 may be fitted in the through hole 21 of the sleeve receiving base 20.

The core wire removing step may be performed after the injection plug forming step.

When a nozzle 50 for jetting high-pressure liquid is prepared and high-pressure liquid is applied to the end face of the sleeve 10, the core wire 2 is removed. A device that injects a high-pressure liquid (usually water) from a nozzle is called an overnight jet device. Next, a method for manufacturing an injection plug according to a second embodiment of the present invention will be described. FIG. 4 is an explanatory diagram of a method for manufacturing an injection plug according to a second embodiment of the present invention.

The method for manufacturing a spray plug according to the second embodiment is a method for manufacturing a spray plug for spraying a liquid, comprising a sleeve preparation step S11, a sleeve processing step S12, and a sleeve cradle preparation step S13. And a sleeve fitting step S14, an injection plug forming step S15, and a core wire removing step S16.

A plurality of injection holes 1 are provided in the injection plug 1 at an angle.

Only different points from the injection plug manufacturing method according to the first embodiment will be described. The sleeve preparation step S11 and the sleeve processing step S12 are the same as those according to the first embodiment. The sleeve cradle preparation step S13 is a step of preparing the sleeve cradle 20. Here, the sleeve receiving base 20 is a member having a flat plate portion. The flat plate portion is provided with a through hole 21 penetrating the back surface 22 and the front surface 23.

Of the plurality of through holes 21, the through hole 21 except for the center is inclined.

A special tool head 40 is used to machine the double-faced through hole 21.

The tool head 40 has N cutter tools 41 and N tool chucks 42 and N It is composed of a gear 43 and a mounting shank 44. The cutter tool 4 1 is fixed to the tool chuck 4 2. The rotation axes of the N tool chucks 42 are inclined at a predetermined angle in accordance with the inclination of the through hole 2. The N tool chucks 42 rotate synchronously with the gear 43. N gears. It consists of a centrally located gear and N-1 gears meshing around it. When the central gear 43 rotates, N-1 gears rotate in synchronization with the rotation. The mounting shank 44 is fixed to the central gear 43 and mounted on the NC machine.

By using this tool head 40, N through-holes 2 can be machined into the sleeve receiving base 20 by one operation. The sleeve fitting step S14, the injection plug forming step S15, and the core wire removing step S16 are the same as those according to the first embodiment. Next, a method for manufacturing the fuel injection valve according to the embodiment of the present invention will be described.

The method for manufacturing a fuel injection valve includes an injection plug manufacturing step S10 and a fuel injection valve assembling step S20.

The injection plug manufacturing step S10 is a step of manufacturing an injection plug for injecting a liquid. The injection plug 1 is manufactured by the injection plug manufacturing method according to the above-described embodiment.

The fuel injection valve assembling step is a step of preparing the fuel injection valve body and assembling the injection plug 1 into the fuel injection valve body. The fuel injection valve body supplies fuel to the back surface of the injection plug according to a signal.

The fuel injection valve has, for example, the structure described above. The injection plug according to the above-described embodiment and the fuel injection valve provided with the injection plug can exert the following effects.

The sleeve is fitted into the through hole of the sleeve support, and the hole that penetrates along the axis of the sleeve is the injection hole that injects fuel, so the structure of the injection plug is simplified. . Also, since the outer periphery of the sleeve is tapered and inserted into the through hole and fitted, the sleeve fits securely into the sleeve receiving base.

In particular, since the sleeve with the smaller diameter was inserted into the through hole and fitted together, Even if a strong pressure is applied, the sleeve will not come off easily.

In addition, a metal is attached to the periphery of the core wire by the electro-deposition method, and the hole from which the core wire has been removed is used as the injection hole, so that the accuracy of the shape and size of the injection hole is improved.

In addition, a metal is attached to the periphery of the core wire by electroplating, and the hole from which the core wire has been removed is used as the injection hole.Thus, by reducing the thickness of the core wire, the injection nozzle has a fine diameter injection hole. Can be easily manufactured.

In addition, since the above-described injection plug is incorporated in the fuel injection valve, a fuel injection valve having an injection hole with high dimensional and shape accuracy can be easily manufactured.

Also, since the sleeve sleeve pedestal and material can be selected according to the required heat resistance performance, it can be applied to various injection plugs and fuel injection valves. Further, the injection plug and the method for manufacturing the injection plug according to the above-described embodiment can exert the following effects.

By preparing a sleeve holder with a through hole and a sleeve with a through hole, inserting the sleeve into the through hole and fitting it into the hole, the hole is used as the injection hole, so that the injection plug can be easily manufactured. In addition, the sleeve was manufactured by attaching metal around the core wire by electroforming, the sleeve was inserted into the through hole of the sleeve cradle and fitted, and the hole from which the core wire was removed was used as the injection hole. An injection plug having an injection hole with high accuracy in size and shape can be easily manufactured.

Also, since the core wire is removed after the sleeve is fitted to the sleeve receiving base, the accuracy of the size and shape of the injection hole can be maintained.

In addition, since the core wire is removed after forming the back and front of the plate-shaped part of the sleeve holder integrated with the sleeve, the shape accuracy of the through hole can be maintained, and extra post-processing for finishing is required. Not necessary.

In addition, the sleeve is tapered around the circumference of the sleeve, and the sleeve is inserted into the through hole of the sleeve holder to fit the sleeve, so that the sleeve fits securely into the through hole.

In addition, since the injection plug manufactured in this way is incorporated into the fuel injection valve body, a fuel injection valve with high accuracy in the size and shape of the injection hole can be easily manufactured. The present invention is not limited to the above-described embodiments, and may be used without departing from the gist of the invention. Various changes are possible in the box.

Although the description has been made on the assumption that the cross section of the hole provided in the sleeve is a circle, the shape is not limited to this, and may be, for example, a square, a cross, or a polygon.

In the sleeve fitting process, the method has been described in which the sleeve is press-fitted into the through hole with a predetermined force to fit the sleeve. However, the present invention is not limited to this.For example, the outer diameter of the sleeve and the inner diameter of the through hole may be changed. The so-called “tight fit” state may be adopted, and the cooled sleeve may be inserted into the through hole and fitted (so-called cold fit), or the sleeve may be inserted into the through hole of the heated sleeve holder. It may be inserted and fitted (so-called shrink fit).

In addition, although the example has been described in which the axis of the injection hole provided in the injection nozzle is tapered from the back to the front, the present invention is not limited to this. For example, the injection hole provided in the injection nozzle The inclination of the axis of the hole may be widened from the back to the front.

Claims

The scope of the claims

1. An injection plug for injecting liquid,

A sleeve receiving member which is a member having a 扳 -shaped portion provided with a through hole passing through the back surface and the front surface,

A sleeve having a hole penetrating along the axis, and an outer peripheral portion being a shaft fitted into the through hole;

The hole is an injection hole for injecting a liquid,

An injection plug, characterized in that:

2. The injection plug according to claim 1, wherein at least one of the through hole and the outer peripheral portion is tapered.

3. The sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electro-deposition method.

The hole is a mark after removing the core wire,

The injection plug according to claim 1, wherein:

4. A fuel injector that injects fuel according to a signal,

A sleeve receiving member, which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface, and a shaft body provided with a hole penetrating along the axis, and an outer peripheral portion fitted into the through hole. An injection plug having a sleep, wherein the hole is an injection hole for injecting a liquid,

A fuel injection valve body for supplying fuel to the back of the injection plug according to a signal,

A fuel injection valve comprising:

5. The fuel injection valve according to claim 4, wherein at least one of the through hole and the outer peripheral portion is tapered.

6. The sleeve is manufactured by attaching metal to the outer periphery of a core wire by an electroforming method,

The hole is a mark after removing the core wire,

5. The fuel injection valve according to claim 4, wherein:

7. A method for manufacturing a spray plug for spraying a liquid,

A sleeve receiving member which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface Preparing the sleeve cradle,

A sleeve preparing step of preparing a sleeve which is a shaft having a hole penetrating along the axis; and a sleeve fitting for inserting an outer peripheral portion of the sleeve into the through hole of the sleeve receiving base to fit therein. Process and

With

The hole is an injection hole for injecting a liquid,

What is claimed is: 1. A method for producing a spray plug.

8. A method of manufacturing a spray plug for spraying a liquid,

A sleeve cradle preparation step of preparing a sleeve cradle, which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface,

A sleeve preparation step of preparing a sleeve which is manufactured by attaching metal to the outer periphery of the core wire by an electrode method and has a hole penetrating along the axis and having the core wire clogged,

A sleeve fitting step of inserting an outer peripheral portion of the sleeve into the through hole of the sleeve receiving base and fitting the sleeve into the through hole;

A core wire removing step of removing the core wire from the sleeve,

With

The hole from which the core wire is removed is an ejection hole for ejecting liquid,

What is claimed is: 1. A method for manufacturing an injection plug, comprising:

9. A method for manufacturing a spray plug for spraying a liquid,

A sleeve preparation step of preparing a sleeve which is manufactured by attaching a metal to the outer periphery of the core wire by an electrode method and has a hole penetrated along the axis and having a hole filled with the core wire;

A sleeve fitting step of inserting an outer peripheral portion of the sleeve, in which the core wire is clogged in the hole, into the through hole of the sleeve receiving base to fit therein;

A core wire removing step of removing the core wire from the sleeve fitted to the sleeve support,

What is claimed is: 1. A method for producing a spray plug.

10. A method for manufacturing a spray plug for spraying liquid,

A sleeve cradle preparation step of preparing a sleep cradle, which is a member having a plate-shaped portion provided with a through-hole penetrating the back surface and the front surface,

A sleeve preparation step of preparing a sleeve that is manufactured by attaching metal to the outer periphery of the core wire by an electrode method and has a hole penetrating along the axis and having the core wire buried therein;

A sleeve fitting step in which the sleeve whose core wire is clogged in the hole is inserted into the through hole of the sleeve receiving base and fitted therein;

An injection plug forming step of forming a front surface and a back surface of a plate-shaped portion of the sleeve receiving base integrated with the sleeve in which the core wire is filled in the hole;

A core wire removing step of removing the core wire from the sleeve fitted to the sleeve receiving base,

1 1. The sleeve forming step of forming a taper on the outer peripheral portion of the sleep,

Characterized by having

A method for manufacturing an injection plug according to any one of claims 7 to 10.

1 2. A method for manufacturing a fuel injection valve for injecting fuel according to a signal,

An injection plug manufacturing step of manufacturing the injection plug by the injection plug manufacturing method according to any one of claims 7 to 10;

An injection plug assembling step of incorporating the injection plug into a fuel injection valve body,

With

The method for manufacturing a fuel injection valve, wherein the fuel injection valve body supplies fuel to a rear surface of the injection plug according to a signal.