JP2005098196A - Injection plug, its manufacturing method and fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection plug, a fuel injection valve incorporated with this injection plug, and its manufacturing method, having a high degree of freedom of manufacture, superior in workability, and easy in maintaining accuracy. <P>SOLUTION: Instead of a conventional injection plug for injecting liquid, this injection plug has a sleeve receiving base being a member having a plate-like part provided with a through-hole penetrating through a back face and a front face, and a sleeve being a shaft body having a hole penetrated along the axis, and having an outer peripheral part fitted to the through-hole. The hole is an injection hole for injecting the liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing an injection plug for injecting a fluid. In particular, the present invention relates to an injection plug having a feature in a manufacturing process of an injection plug and 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.

In industry, spray plugs are used to spray fluid.
For example, in a diesel engine, fuel is directly injected into high-temperature air in a combustion chamber obtained by a piston compression process, causing self-ignition to burn the fuel. A fuel injection valve having an injection plug is used to inject fuel into the combustion chamber. The fuel injection valve adjusts the engine output by adjusting the amount of fuel injected into the combustion chamber.
In a diesel engine, a fuel injection device called a common rail system is adopted as an exhaust gas countermeasure. In the common rail system, high-pressure fuel is injected into the combustion chamber by an injection valve to refine the fuel particles, improve the combustion state, and reduce the discharged black smoke. In order to effectively reduce graphite, it is necessary to appropriately adjust the back pressure of the injection nozzle. Therefore, the back pressure is detected and adjusted by a sensor, and the injection timing and the injection amount are optimized by electronic control.
Furthermore, by making the injection hole of the injection nozzle ultrafine, the particles of fuel injected into the combustion chamber are reduced, and optimal combustion is promoted.

The structure of the conventional injection nozzle will be described below.
The tip of the spray nozzle is configured with a filter. The filter is a plate provided with a large number of small-diameter through holes (this is referred to as an orifice plate). For example, the orifice plate is a disk-shaped metal plate in which through holes of 0.125 mm are provided at about 12 locations.

  The orifice plate is manufactured by forming a small-diameter through hole in a metal plate by pressing and then subjecting the metal plate to a treatment for increasing the hardness. Since the through hole can be opened by pressing, the diameter cannot be made very small compared to the thickness of the metal plate, and it has been exclusively based on the skill of the operator. Moreover, the shape of the through hole is limited, and it has been impossible to improve the accuracy of the shape and size of the through hole.

A fuel injection valve is used in a gasoline engine. The fuel injection valve injects fuel into the intake manifold or the combustion chamber.
In a fuel injection device called direct injection type that directly injects fuel into the combustion chamber, the orifice plate is directly exposed to the combustion gas in the combustion chamber, so the size and material of the metal plate of the orifice plate are limited, This further made it difficult to control the shape and dimensions of the through holes.
Further, for example, in order to open twelve 0.125 mm through holes in the metal plate, it is necessary to strictly assemble and adjust the press die, and the working efficiency cannot be improved further.

JP 2001-027169 A JP 2000-199469 A JP 2000-115628 A “Nikkei Business”, February 11, 2002, p. 44

  As described above, in the conventional method for manufacturing an injection plug of a fuel injection valve, the shape or size of the injection hole can be freely selected, the dimensional accuracy can be improved, the material can be selected freely, or the workability can be improved. It was difficult to improve.

  The present invention has been devised in view of the above-described problems. It replaces the conventional injection plug and the fuel injection valve equipped with the injection plug, and has a high degree of freedom in manufacturing, good workability, and accuracy. An easy-to-maintain injection plug, a fuel injection valve incorporating the injection plug, and a method of manufacturing the fuel injection valve are provided.

  In order to achieve the above object, an injection plug for injecting a liquid according to the present invention includes 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, along the axis. And a sleeve which is a shaft body having a through hole and an outer peripheral portion fitted in the through hole, and the hole is an injection hole for injecting a liquid.

  According to the above configuration of the present invention, the plate-like portion of the sleeve cradle 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, if a liquid is supplied to the back surface of the said plate-shaped part, a liquid will inject from the front side of a hole.

Furthermore, in the spray plug according to the present invention, it is preferable that at least one of the through hole or the outer peripheral portion is tapered.
According to the configuration of the present invention, since at least one of the through hole or the outer peripheral portion is tapered, the sleeve fits firmly into the through hole of the sleeve cradle.

Furthermore, in the injection plug according to the present invention, it is preferable that the sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electroforming method, and the hole is a trace of removing the core wire.
According to the configuration of the present invention, since the sleeve is manufactured by attaching metal to the outer periphery of the core wire by electroforming, and the hole is a trace of removing the core wire, the sleeve has a desired shape and size. A spray plug with a hole can be easily made.

    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 cradle and a shaft center, which is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface. An injection plug which is provided with a sleeve which is a shaft body which is provided with a hole penetrating therethrough and whose outer peripheral portion is fitted in the through-hole, and in which the hole is an injection hole for injecting liquid; And a fuel injection valve main body to be supplied to the back surface of the fuel.

  According to the configuration of the present invention, the injection plug is provided with a sleeve base that is a member having a plate-like portion provided with a through hole penetrating the back surface and the front surface, and an outer peripheral portion provided with a hole penetrating along the axis. And a sleeve which is a shaft body fitted into the through hole, and the hole is an injection hole for injecting liquid, and the fuel injection valve body supplies fuel to the back surface of the injection plug according to the signal. According to the signal, fuel can be injected from the front side of the hole of the injection plug.

Furthermore, it is preferable that at least one of the through hole or the outer peripheral portion of the injection plug of the fuel injection valve according to the present invention is tapered.
According to the configuration of the present invention, since at least one of the through hole or the outer peripheral portion is tapered, the sleeve fits firmly into the through hole of the sleeve cradle.

Further, the injection plug of the fuel injection valve according to the present invention, the sleeve is manufactured by attaching metal to the outer periphery of the core wire by electroforming, and the hole is a trace of removing the core wire. Is preferred.
According to the configuration of the present invention, since the sleeve is manufactured by attaching metal to the outer periphery of the core wire by electroforming, and the hole is a trace of removing the core wire, the sleeve has a desired shape and size. A fuel injection valve with a hole can be easily made.

  In order to achieve the above object, a method for producing a jet plug for jetting a liquid according to the present invention provides a sleeve base that is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A cradle preparation step, a sleeve preparation step of preparing a sleeve which is a shaft body having a hole penetrating along the shaft center, and an outer peripheral portion of the sleeve is inserted into the through hole of the sleeve cradle and fitted. A sleeve fitting step, and the holes are injection holes for injecting liquid.

  According to the configuration of the present invention, 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 in the sleeve cradle preparing step, is prepared, and along the axis in the sleeve preparing step. A sleeve, which is a shaft body having a through-hole, is prepared, and the outer peripheral portion of the sleeve is inserted and fitted into the through-hole of the sleeve cradle. When a liquid is supplied to the injection plug, an injection plug in which the liquid is injected from the front side of the hole can be manufactured.

  In order to achieve the above object, a method for producing a jet plug for jetting a liquid according to the present invention provides a sleeve base that is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A cradle preparation step, a sleeve preparation step of preparing a sleeve which is a shaft body manufactured by attaching a metal to the outer periphery of the core wire by electroforming and penetrating along the shaft center and having a hole clogged with the core wire; and A sleeve fitting step of inserting and fitting an outer peripheral portion of the sleeve into the through hole of the sleeve cradle; and a core wire removing step of removing the core wire from the sleeve, wherein the hole from which the core wire is removed is a liquid It was an injection hole for injecting.

  According to the configuration of the present invention, 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 in the sleeve cradle preparation step, is prepared, and the core wire is formed by electroforming in the sleeve preparation step. A sleeve that is a shaft body that is manufactured by attaching metal to the outer periphery of the sleeve and has a hole that penetrates along the shaft center and that is clogged with the core wire is prepared, and the outer periphery of the sleeve is attached to the sleeve cradle in the sleeve fitting step. Since the core wire is removed from the sleeve in the core wire removing step by inserting and fitting into the through hole, and the hole from which the core wire has been removed is an injection hole for injecting liquid, it has a hole having a desired shape and size. A simple spray plug can be made.

  In order to achieve the above object, a method for producing a jet plug for jetting a liquid according to the present invention provides a sleeve base that is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A cradle preparation step, a sleeve preparation step of preparing a sleeve which is a shaft body manufactured by attaching a metal to the outer periphery of the core wire by electroforming and penetrating along the shaft center and having a hole clogged with the core wire; and A sleeve fitting step in which an outer peripheral portion of the sleeve clogged with the core wire is inserted and fitted into the through hole of the sleeve cradle, and the core wire is removed from the sleeve fitted in the sleeve cradle. A core wire removing step, wherein the hole from which the core wire has been removed is an injection hole for ejecting liquid.

  According to the configuration of the present invention, 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 in the sleeve cradle preparation step, is prepared, and the core wire is formed by electroforming in the sleeve preparation step. A sleeve that is a shaft body that is manufactured by attaching metal to the outer periphery of the sleeve and that has a hole that penetrates along the shaft center and that is clogged with the core wire is prepared. An outer peripheral portion is inserted and fitted into the through hole of the sleeve cradle, the core wire is removed from the sleeve fitted to the sleeve cradle in a core wire removal step, and the hole from which the core wire is removed ejects liquid. Therefore, it is possible to easily form an injection plug having a hole having a desired shape and size.

  In order to achieve the above object, a method for producing a jet plug for jetting a liquid according to the present invention provides a sleeve base that is a member having a plate-like portion provided with a through hole penetrating a back surface and a front surface. A cradle preparation step, and a sleeve preparation step of preparing a sleeve which is a shaft body which is manufactured by attaching metal to the outer periphery of the core wire by electroforming and has a hole penetrating along the axis and having the core wire buried therein; A sleeve fitting step of inserting and fitting the sleeve with the core wire packed in the hole into the through-hole of the sleeve cradle; and the sleeve cradle integrated with the sleeve with the core wire packed in the hole An injection plug forming step for forming the front and back surfaces of the plate-like portion, and a core wire removing step for removing the core wire from the sleeve fitted to the sleeve cradle, wherein the core wire is removed. There is an injection hole for injecting the liquid, and the things.

  According to the configuration of the present invention, 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 in the sleeve cradle preparation step, is prepared, and the core wire is formed by electroforming in the sleeve preparation step. A sleeve that is a shaft body that 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 wire buried therein is prepared, and the sleeve in which the core wire is clogged in the hole in a sleeve fitting step Inserting and fitting into the through hole of the sleeve cradle and molding the front and back surfaces of the plate portion of the sleeve cradle integrated with the sleeve in which the core wire is clogged in the hole in the injection plug molding process Then, the core wire is removed from the sleeve fitted to the sleeve cradle in the core wire removal step, and the hole from which the core wire is removed is an injection hole for injecting liquid, so an extra post-process is not required. Desired The injection plug having a hole in shape and size can be made easily.

Furthermore, it is preferable that the method for manufacturing an injection plug according to the present invention includes a sleeve processing step of forming a taper on the outer peripheral portion of the sleeve.
According to the configuration of the present invention, a taper is formed on the outer peripheral portion of the sleeve, so that the sleeve fits firmly into the through hole of the sleeve cradle.

  Further, a method for manufacturing a fuel injection valve for injecting fuel according to a signal, an injection plug manufacturing process for manufacturing the injection plug by the above-described injection plug manufacturing method, and an injection plug for incorporating the injection plug into a fuel injection valve body An assembly step, and the fuel injection valve main body supplies fuel to the back surface of the injection plug in accordance with a signal.

  According to the configuration of the above invention, the injection plug is manufactured by the injection plug manufacturing method described above in the injection plug manufacturing process, the injection plug is integrated in the fuel injection valve body in the injection plug installation process, and the fuel injection valve body is a signal. Accordingly, the fuel is supplied to the back surface of the injection plug. Therefore, an injection plug having a hole having a desired shape and size can be easily produced.

As described above, the jet plug for jetting the liquid of the present invention has the following effects due to its configuration.
A sleeve provided with a hole penetrating along the axial center fits into a through hole provided in the sleeve cradle, and the hole is an injection hole for ejecting liquid. Liquid is ejected from the side.
Further, since at least one of the through hole or the outer peripheral portion is tapered, the sleeve fits firmly into the through hole of the sleeve cradle.
Further, since the sleeve is manufactured by attaching metal to the outer periphery of the core wire by electroforming, and the hole is a trace of removing the core wire, the injection having a hole having a desired shape and size Plugs can be made easily.

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.
An injection plug of a fuel injection valve has a sleeve cradle and a sleeve, and a sleeve provided with a hole penetrating along the axial center is fitted into a through hole provided in the sleeve cradle, and the hole injects liquid. When the liquid is supplied to the rear surface, the liquid is ejected from the front side of the hole.
Further, since at least one of the through hole or the outer peripheral portion is tapered, the sleeve fits firmly into the through hole of the sleeve cradle.
Further, since the sleeve is manufactured by attaching metal to the outer periphery of the core wire by an electroforming method, and the hole is a trace of removing the core wire, a fuel having a hole having a desired shape and size. The injection valve can be made easily.

In addition, as described above, the method for manufacturing a jet plug for jetting a liquid according to the present invention has the following effects due to its configuration.
Prepare a sleeve cradle having a through hole penetrating the back surface and the front surface and a sleeve having a hole penetrating along the axis, and insert the sleeve into the through hole of the sleeve cradle and fit the hole. Since the nozzle holes for ejecting liquid are used, it is possible to manufacture an ejection plug that ejects liquid from the front side of the hole when the liquid is supplied to the back surface.
A sleeve, which is a shaft body that is manufactured by electroforming and depositing metal around the core wire and penetrates along the shaft center and has a hole clogged with the core wire, is prepared. A hole in which the core wire is removed is press-fitted into a through-hole penetrating the back surface and the document, and a hole for ejecting liquid is used as an injection hole. Therefore, an injection plug having a hole having a desired shape and size can be easily produced. be able to.
A sleeve, which is a shaft body that is manufactured by electroforming and depositing metal around the core wire and has a hole penetrating along the shaft center and clogged with the core wire, is prepared. A hole having a desired shape and size is formed by press-fitting into a through-hole penetrating from the first surface to the other surface, removing the core wire, and the hole from which the core wire has been removed is an injection hole for injecting liquid. It is possible to easily make a spray plug.
A sleeve, which is a shaft body that is manufactured by electroforming and depositing metal around the core wire and has a hole penetrating along the shaft center and clogged with the core wire, is prepared. The core wire was removed after the back and front surfaces of the sleeve base integrated with the sleeve were molded by press-fitting into the through-hole penetrating from the surface to the other surface, and the core wire was removed. Since the hole serves as an injection hole for injecting the liquid, an injection plug having a hole having a desired shape and size can be easily formed without requiring an extra post-process.
Since the outer periphery of the sleeve is tapered, the sleeve fits securely into the through hole of the sleeve cradle.

Further, as described above, the method of manufacturing a fuel injection valve that injects fuel according to the signal of the present invention 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, the fuel injection valve that injects fuel according to the signal can be easily manufactured.
Therefore, it is possible to provide an injection plug having a high degree of freedom in manufacturing, good workability, and easy maintenance of accuracy, a fuel injection valve including the injection plug, and a manufacturing method thereof.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  The structure of the fuel injection valve provided with the injection plug which concerns on 1st embodiment of this invention, and the injection plug is demonstrated. FIG. 1 is a cross-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 the use of the fuel injection valve according to the embodiment of the present invention.

Initially, the injection plug 1 which concerns on embodiment of this invention is demonstrated.
The ejection plug 1 ejects liquid and includes a sleeve 10 and a sleeve cradle 20.
The sleeve cradle 20 is a member having a plate-like portion provided with a through hole 21. The penetrating portion 21 penetrates the back surface 22 and the front surface 23 of the plate-shaped portion.
The through hole 21 is preferably a rectilinear hole having a circular cross section. For example, the through-hole 21 is finished with a straight reamer or a taper reamer after being drilled with a drill. When the outer periphery of the sleeve 10 is tapered, the through hole 21 is preferably finished with a straight reamer.
The material of the sleeve cradle is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and nickel composite material. The nickel composite material is a composite material based on nickel, for example, a mixture of nickel and silicon carbide (SiC).
The sleeve cradle is manufactured by cutting from one of stainless steel, free-cutting steel, SK steel, and SKS steel, or formed by electroforming nickel or nickel composite material. preferable.
When the sleeve cradle is manufactured by electroforming, the sleeve cradle is preferably made of nickel or a nickel composite material.

The sleeve 10 is a shaft body having a hole 2 penetrating along an axial center, and the outer peripheral portion is fitted into the through hole 21, and the hole 2 is an ejection hole 2 for ejecting liquid.
The sleeve 10 is preferably a circular hollow shaft. A taper is preferably provided on the outer periphery of the sleeve 20. When the taper is provided on the outer peripheral portion, it is preferable that the diameter of the front side when the sleeve 20 is inserted into the through hole is smaller than the diameter of the rear side.
The sleeve 10 is manufactured by attaching metal to the outer periphery of the core wire 7 by electroforming, and the hole is preferably a trace of the core wire 7 removed. In particular, when nickel is deposited by electroforming, the transferability is good, so 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 a nickel composite material. The nickel composite material is a composite material based on nickel, for example, a mixture of nickel and silicon carbide (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 according to a signal, and includes a fuel injection valve main body 30 and an injection plug 1.
The fuel injection valve 8 is attached to, for example, a cylinder head of an engine, and the front surface 23 of the injection plug 1 is exposed to the combustion chamber.
The fuel injection valve main body 30 supplies high-pressure fuel to the back surface of the injection plug 1 in accordance with a signal, and includes a frame 31, an actuator 32, a valve 33, a fuel passage 34, and a fuel chamber 35.
The frame 31 is a main structure of the fuel injection valve main body 30 and forms a fuel passage 34 and a fuel chamber 35 therein.
The actuator 32 is a mechanical element that is driven by a signal to open and close the valve 33.
The valve 33 opens and closes a location where the fuel passage 34 and the fuel chamber 35 communicate with each other.
When the actuator 32 opens the valve 33, the fuel passage 34 and the fuel chamber 35 communicate with each other, and high-pressure fuel flows into the fuel chamber 35.

  The injection plug 1 is supplied with high-pressure fuel on the back side and injects fuel to the front side, and has the structure described above. The injection plug 1 is fixed to the frame 31 at the outer edge. The back surface 22 of the injection plug faces the fuel chamber 35.

When the actuator 32 opens the valve 33, the high-pressure fuel flows through the fuel passage 34 into the fuel chamber 35. The fuel flowing into the fuel chamber 35 is injected into the space on the front surface 23 side 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 or self-ignited by a spark plug, expands while burning, and drives the crankshaft 6 of the engine.

Next, a method for 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 for manufacturing an injection plug according to the first embodiment is a method for manufacturing an injection plug for injecting a liquid, and includes a sleeve preparation step S11, a sleeve processing step S12, a sleeve cradle preparation step S13, and a sleeve fitting step S14. It is comprised by injection plug shaping | molding process S15 and core wire removal process S16.
Here, the plurality of injection holes 2 are provided in parallel to the injection plug 1.

The sleeve preparation step S11 is a step of preparing the sleeve 10. Here, the sleeve 10 is a shaft body having a hole penetrating along the axis.
The metal is one of stainless steel, free-cutting steel, SK steel, SKS steel, nickel, and a nickel composite material.
It is preferable to prepare a sleeve which is a shaft body which is manufactured by attaching metal to the outer periphery of the core wire 7 by an electroforming method and has a hole penetrating along the shaft center and clogged with the core wire. When the sleeve 10 is manufactured by electroforming, a sleeve having a hole of an arbitrary size and shape can be easily manufactured by selecting the size and shape of the core wire. The core wire is a wire having at least a surface conductive. The core wire is, for example, a piano wire. The material of the core wire is preferably, for example, one of iron, steel, stainless steel, tungsten, nickel, and nickel alloy. Moreover, it is preferable to apply nickel plating and copper plating to the surface of the core wire. Moreover, it is preferable to apply molybdenum powder to the surface of the core wire. If it does in this way, removal of a core wire becomes easy in the core wire removal process mentioned below.
When manufactured by electroforming, the metal is preferably nickel or a nickel composite material. The nickel composite material is a composite material based on nickel, for example, a mixture of nickel and silicon carbide (SiC).
It is preferable to pass the sleeve 10 through a centerless processing machine to improve the accuracy of the size and shape of the outer periphery.

The sleeve processing step S <b> 12 is a step of forming a taper on the outer peripheral portion of the sleeve 10.
The degree of taper is selected between 1/1000 and 5/100, for example.
By using a centerless processing machine, it is possible to easily taper the outer peripheral portion of the sleeve 10 at the same time as improving the accuracy of the size and shape of the outer peripheral portion only by adjusting the inclination of the rotating shaft of the processing machine.

The sleeve cradle preparation step S13 is a step of preparing the sleeve cradle 20. Here, the sleeve 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 cradle 20 is preferably 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 a nickel composite material. The nickel composite material is a composite material based on nickel, for example, a mixture of nickel and silicon carbide (SiC).
The through hole 21 is preferably a rectilinear hole having a circular cross section. For example, the through-hole 21 is finished with a straight reamer or a taper reamer after being drilled with a drill. When the outer peripheral portion of the sleeve 10 is tapered, the through hole 21 is preferably finished by a straight reamer.

The sleeve fitting step S <b> 14 is a step in which the outer peripheral portion of the sleeve 10 is inserted into the through hole 21 of the sleeve cradle 20 and fitted.
When the sleeve 10 is press-fitted with a predetermined force, the outer periphery of the sleeve 10 is fitted into the through hole 21.
It is preferable to press-fit a sleeve 10 having a tapered outer peripheral portion from the front side with the smaller taper diameter first. In this case, when the injection plug is used to inject fuel into the combustion chamber of the engine, the sleeve may come 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.

  The injection plug forming step S <b> 15 is a step of forming the back surface and the front surface of the plate-like portion of the sleeve cradle 20 integrated with the sleeve 10. In this step, it is preferable that the core wire 7 is clogged in the hole 2. If it does in this way, it can prevent that the shape and dimension of the hole 2 change during a manufacturing process, and it can prevent that an extra post-process is needed.

The core wire removing step S16 is a step of removing the core wire 2 from the sleeve. In this step, the sleeve 10 is preferably fitted in the through hole 21 of the sleeve cradle 20.
Moreover, it is preferable that a core wire removal process is performed after an injection plug shaping | molding process.
When the nozzle 50 for injecting high-pressure liquid is prepared and the high-pressure liquid is applied to the end face of the sleeve 10, the core wire 2 is removed. A device that ejects a high-pressure liquid (usually water) from a nozzle is called a water jet device.

Next, a method for manufacturing an injection plug according to the second embodiment of the present invention will be described. FIG. 4 is an explanatory view of a method for manufacturing an injection plug according to the second embodiment of the present invention.
The method for manufacturing an injection plug according to the second embodiment is a method for manufacturing an injection plug for injecting a liquid, and includes a sleeve preparation step S11, a sleeve processing step S12, a sleeve cradle preparation step S13, and a sleeve fitting step S14. It is comprised by injection plug shaping | molding process S15 and core wire removal process S16.
A plurality of injection holes 1 are provided in the injection plug 1 so as to be inclined.
Only differences from the method of manufacturing the injection plug 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 cradle 20 is a member having a flat plate portion. The flat plate portion is provided with a through hole 21 that penetrates the back surface 22 and the front surface 23.
Of the plurality of through holes 21, the through holes 21 are inclined except for the central portion.
A dedicated tool head 40 is used to process the plurality of through holes 21.
The tool head 40 includes N cutter tools 41, N tool chucks 42, N gears 43, and attachment shanks 44. The cutter tool 41 is fixed to the tool chuck 42. 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 are rotated in synchronization with the gear 43. N gears. It consists of one gear located in the center and N-1 gears meshed around it. When the central gear 43 rotates, N−1 gears rotate in synchronization with the rotation. The attachment shank 44 is fixed to the central gear 43 and attached to the NC machine.
When this tool head 40 is used, the N through holes 2 can be processed into the sleeve cradle 20 with a single 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 a fuel injection valve according to an embodiment of the present invention will be described.
The fuel injection valve manufacturing method includes an injection plug manufacturing step S10 and a fuel injection valve incorporating step S20.
The injection plug manufacturing step S10 is a step of manufacturing an injection plug for injecting a liquid, and the injection plug 1 is manufactured by the injection plug manufacturing method according to the above-described embodiment.
The fuel injection valve incorporating step is a step of preparing a fuel injection valve main body and incorporating the injection plug 1 into the fuel injection valve main body. The fuel injection valve body supplies fuel to the back surface of the injection plug in accordance with a signal.
The fuel injection valve has the structure described above, for example.

The fuel injection valve including the injection plug and the injection plug according to the above-described embodiment can exhibit the following effects.
Since the sleeve is fitted into the through hole of the sleeve base and the hole penetrating along the axis of the sleeve is an injection hole for injecting fuel, the structure of the injection plug is simplified.
Further, since the outer peripheral portion of the sleeve is tapered and inserted into the through-hole, the sleeve is firmly fitted to the sleeve cradle.
In particular, since the sleeve having the smaller diameter is inserted into the through hole and fitted, the sleeve is difficult to come out even when high pressure is applied.
In addition, since the metal is attached to the periphery of the core wire by electroforming, and the hole from which the core wire is removed is used as the injection hole, the accuracy of the shape and size of the injection hole is increased.
In addition, since the sleeve is electroformed and metal is attached around the core wire, and the hole from which the core wire is removed is used as the injection hole, by reducing the thickness of the core wire, an injection nozzle having a fine diameter injection hole is provided. It can be manufactured easily.
In addition, since the above-described injection plug is incorporated in the fuel injection valve, a fuel injection valve having injection holes with high accuracy in size and shape can be easily manufactured.
Further, since the sleeve cradle and the material of the sleeve can be selected according to the required heat resistance, it can be applied to various injection plugs and fuel injection valves.

Moreover, the injection plug and the method for manufacturing the injection plug according to the above-described embodiment can exhibit the following effects.
Since a sleeve cradle having a through hole and a sleeve having a through hole are prepared, the sleeve is inserted into the through hole and fitted into the hole, and the hole is used as the injection hole, so that the injection plug can be easily manufactured.
Also, the sleeve was manufactured by electroforming the metal around the core wire, and 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 shape accuracy can be easily made.
Further, since the core wire is removed after the sleeve is fitted to the sleeve cradle, the accuracy of the size and shape of the injection hole can be maintained.
In addition, since the core wire is removed after the back and front of the plate-like portion of the sleeve cradle integrated with the sleeve are formed, the shape accuracy of the through hole can be maintained, and an extra post process for finishing is required. Not necessary.
In addition, since the outer periphery of the sleeve is tapered and the sleeve is inserted into the through hole of the sleeve cradle to be fitted, the sleeve is firmly fitted into the through hole.
Moreover, since the injection plug manufactured in this way is incorporated in the fuel injection valve body, a fuel injection valve with high accuracy of the size and shape of the injection hole can be easily manufactured.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.
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 of fitting the sleeve into the through hole with a predetermined force has been described. However, the present invention is not limited to this. For example, the outer diameter dimension of the sleeve and the inner diameter dimension of the through hole are referred to as “sliding”. It is possible to insert the cooled sleeve into the through-hole so that it is in a “fitted” state (so-called cold fitting), or insert the sleeve into the through-hole of the heated sleeve cradle and fit it It may be allowed (so-called shrink fitting).
In addition, although the example in which the inclination of the axis of the injection hole provided in the injection nozzle has a shape that is tapered from the back to the front has been described, the present invention is not limited to this. For example, the injection provided in the injection nozzle The inclination of the hole axis may be expanded from the back to the front.

It is sectional drawing of the fuel injection valve and injection plug which concern on embodiment of this invention. It is a flowchart figure of the manufacturing method of the injection plug which concerns on embodiment of this invention. It is explanatory drawing of the manufacturing method of the injection plug which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the injection plug which concerns on 2nd embodiment of this invention. It is use explanatory drawing of the fuel injection valve which concerns on embodiment of this invention.

Explanation of symbols

1 Injection plug 2 Injection hole (hole)
DESCRIPTION OF SYMBOLS 3 Cylinder head 4 Injection mist 5 Piston 6 Crankshaft 7 Core wire 8 Fuel injection valve 10 Sleeve 20 Sleeve base 21 Through-hole 22 Back surface 23 Front surface 30 Fuel injection valve 31 Frame 32 Actuator 33 Valve 34 Fuel passage 35 Fuel chamber 40 Tool head 41 Cutter tool 42 Tool chuck 43 Gear 44 Mounting shank 50 Water jet

Claims (12)

An injection plug for injecting liquid,
A sleeve cradle that is a member having a plate-like portion provided with a through-hole penetrating the back surface and the front surface;
A sleeve which is a shaft body having a hole penetrating along the axis and having an outer peripheral portion fitted into the through hole;
With
The hole is an injection hole for injecting a liquid;
An injection plug characterized by that. At least one of the through hole or the outer peripheral portion is tapered,
The injection plug according to claim 1. The sleeve is manufactured by electroforming a metal attached to the outer periphery of the core wire,
The hole is a trace of removing the core wire,
The injection plug according to claim 1. A fuel injection valve for injecting fuel according to a signal,
It is a shaft body in which a hole that penetrates along a shaft center is provided and a peripheral portion is fitted in the through-hole, and a sleeve base that is a member having a plate-like portion provided with a through-hole penetrating the back surface and the front surface An injection plug that has a sleeve and the hole is an injection hole through which liquid is injected;
A fuel injection valve body for supplying fuel to the back of the injection plug according to a signal;
A fuel injection valve comprising: At least one of the through hole or the outer peripheral portion is tapered,
The fuel injection valve according to claim 4. The sleeve is manufactured by electroforming a metal attached to the outer periphery of the core wire,
The hole is a trace of removing the core wire,
The fuel injection valve according to claim 4. A method of manufacturing an injection plug for injecting liquid,
A sleeve cradle preparation step of preparing a sleeve cradle that 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 a shaft body having a hole penetrating along an axis;
A sleeve fitting step of inserting and fitting the outer peripheral portion of the sleeve into the through hole of the sleeve cradle;
With
The hole is an injection hole for injecting a liquid;
A method of manufacturing a spray plug, characterized by the above. A method of manufacturing an injection plug for injecting liquid,
A sleeve cradle preparation step of preparing a sleeve cradle that 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 a shaft body manufactured by attaching metal to the outer periphery of the core wire by electroforming and penetrating along the shaft center and having a hole clogged with the core wire;
A sleeve fitting step of inserting and fitting the outer peripheral portion of the sleeve into the through hole of the sleeve cradle;
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 injection hole for injecting a liquid,
A method of manufacturing a spray plug, characterized by the above. A method of manufacturing an injection plug for injecting liquid,
A sleeve cradle preparation step of preparing a sleeve cradle that 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 a shaft body manufactured by attaching metal to the outer periphery of the core wire by electroforming and penetrating along the shaft center and having a hole clogged with the core wire;
A sleeve fitting step of inserting and fitting the outer peripheral portion of the sleeve, in which the core wire is clogged into the hole, into the through hole of the sleeve cradle;
A core wire removing step of removing the core wire from the sleeve fitted to the sleeve cradle;
With
The hole from which the core wire is removed is an injection hole for injecting a liquid,
A method of manufacturing a spray plug, characterized by the above. A method of manufacturing an injection plug for injecting liquid,
A sleeve cradle preparation step of preparing a sleeve cradle that 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 a shaft body manufactured by attaching metal to the outer periphery of the core wire by electroforming and penetrating along the axis and having a hole filled with the core wire;
A sleeve fitting step of inserting and fitting the sleeve in which the core wire is packed in the hole into the through hole of the sleeve cradle; and
An injection plug molding step for molding the front and back surfaces of the plate portion of the sleeve cradle integrated with the sleeve in which the core wire is packed in the hole;
A core wire removing step of removing the core wire from the sleeve fitted to the sleeve cradle;
With
The hole from which the core wire is removed is an injection hole for injecting a liquid,
A method of manufacturing a spray plug, characterized by the above. A sleeve processing step of forming a taper on the outer periphery of the sleeve;
Characterized by comprising,
A method for manufacturing a spray plug according to claim 7. A fuel injection valve manufacturing method for injecting fuel according to a signal,
An injection plug manufacturing process for manufacturing the injection plug by the injection plug manufacturing method according to claim 7,
An injection plug incorporating step of incorporating the injection plug into the fuel injection valve body;
With
The fuel injection valve main body supplies fuel to the back surface of the injection plug according to a signal.
A method for manufacturing a fuel injection valve.

Images