JP2010223085A - Injection quantity adjusting method of fluid injection valve and fluid injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection quantity adjusting method for improving adjusting accuracy in an injection quantity, by highly accurately measuring a lift quantity of a valve member. <P>SOLUTION: A fuel injection valve 10 measures the lift quantity of a needle 50, and the injection quantity is adjusted by adjusting a fixing position of a fixed core 64 for determining the lift quantity based on its measured result. The needle 50 of the fuel injection valve 10 is formed in a bottomed cylindrical shape, and a projection part 54 butting against an end surface 322 of a measuring piece 320 inserted when measuring the lift quantity, is formed inside this bottom part. The end surface 322 becomes a flat surface, and a top surface 55 of the projection part 54 becomes a spherical surface such as reducing an outer diameter toward the flat surface. When measuring the lift quantity, the lift quantity of the needle 50 is measured by seating and unseating the needle 50 by butting the flat surface and the spherical surface formed in this way. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and a fluid injection valve for adjusting an injection amount of a fluid injection valve, and more particularly to an injection amount adjustment method and a fluid injection valve for a fuel injection valve that injects fuel into an internal combustion engine (hereinafter referred to as an engine).

  Conventionally, the fuel injection amount is adjusted by measuring the lift amount of the valve member of the fuel injection valve and adjusting the fixed position of the movement restricting portion that restricts the movement of the valve member in the seating direction based on the measured result. A method for adjusting the injection amount is known (see Patent Document 1). Hereinafter, the lift amount of the valve member means the amount of displacement of the valve member from the state in which the valve member is seated on the valve seat until the valve member comes into contact with the movement restricting portion.

Japanese Patent Laid-Open No. 2003-13821

  Here, as a method of measuring the lift amount of the valve member, with the measuring member inserted into the valve member from the outside of the fuel injection valve and the tip of the measuring member abutting against the valve member, the valve member is A method of measuring the lift amount of the valve member by moving the seat away from the seat is known.

  In order to improve the controllability of injection, it is considered to reduce the weight of the valve member. One means for reducing the weight of the valve member is to form a bottomed cylinder having a cavity inside the valve member. In general, as a method of hollowing out the inside of the valve member, a hollow is formed in the inside of the cylindrical member by drilling a hole along the axial direction with a drill or the like.

  When the cavity is formed in the valve member in this manner, the shape inside the bottom of the valve member does not become a shape determined for each valve member. Further, as disclosed in Patent Document 1, the inner shape of the bottom portion becomes conical so that the inner diameter becomes smaller toward the tip. Further, since the purpose is to reduce the weight of the valve member, there is no designation of the surface roughness of the inner peripheral wall of the valve member, and it is often in a state where it is shaved with a drill.

  In order to measure the lift amount of the valve member having such a shape by the above-described method, if the tip portion of the probe is brought into contact with the inside of the bottom portion of the valve member, the tip portion is displaced in the radial direction, etc. There is a risk of hitting the middle of the slope of the conical surface or hitting the bottom of the conical surface.

  If the position where the tip portion abuts changes every measurement, the position of the tip portion in the axial direction with respect to the valve member changes, and the lift amount measurement accuracy of the valve member becomes low. If the fixed position of the movement restricting portion is adjusted based on the measurement value with low accuracy, the adjustment accuracy of the injection amount is affected and the adjustment accuracy is deteriorated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an injection amount adjustment method capable of measuring the lift amount of the valve member with high accuracy and improving the adjustment accuracy of the injection amount. Is to provide. Another object is to provide a fluid injection valve capable of measuring the lift amount of the valve member with high accuracy and improving the adjustment accuracy of the injection amount.

In the first aspect of the present invention, the valve member is formed in a bottomed cylindrical shape and has a contact portion on the outer side of the bottom portion, the valve member is accommodated so as to be reciprocable in the axial direction, and the contact portion is seated on the inner side. A valve seat, and a body portion having an injection hole on the tip side of the valve seat, and a movement restricting portion that is fixed to the body portion and restricts the movement of the valve member in the separating direction by contacting the valve member. In the injection amount adjustment method for adjusting the injection amount of the fluid injection valve provided,
A lift amount measuring step for measuring the lift amount of the valve member; a target fixed position calculating step for calculating a target fixed position of the movement restricting portion relative to the body portion based on the lift amount of the valve member measured in the lift amount measuring step; A fixed position adjusting step of adjusting the fixed position of the movement restricting portion with respect to the body portion based on the target fixed position calculated in the target fixed position calculating step,
On the inner side of the bottom of the valve member, when the tip of the probe is inserted inside the valve member along the direction of the seating movement of the valve member, a protrusion is formed that protrudes toward the tip of the probe. The top surface of the protrusion and the end surface of the tip of the measuring element are formed so as to be opposed to the insertion direction of the measuring element. The surface is a flat surface, and the other surface is tapered so that the outer diameter decreases as it goes toward the flat surface. The lift amount of the valve member is measured by inserting / removing the valve member while the end face of the probe is abutted against the top surface of the protrusion.

In the invention according to claim 5, the valve member is formed in a bottomed cylindrical shape and has a contact portion on the outside of the bottom portion, the valve member is accommodated so as to be capable of reciprocating in the axial direction, and the contact portion is on the inside. A seat to be seated, and a body portion having an injection hole on the tip side of the valve seat, and a movement restricting portion that is fixed to the body portion and restricts the movement of the valve member in the separating direction by contacting the valve member The lift amount of the valve member is measured by moving the valve member in a state where the tip of the probe is abutted against the inside of the bottom of the valve member, and based on the measured lift amount A fluid injection valve in which the injection amount is adjusted by adjusting the fixed position of the movement restricting unit with respect to the body part,
On the inner side of the bottom of the valve member, when the tip of the probe is inserted inside the valve member along the direction of the seating movement of the valve member, a protrusion is formed against which the tip of the probe contacts. The top surface and the end surface of the tip of the probe are formed to be opposite to the insertion direction of the probe, and either one of the top surface of the protrusion and the end surface of the tip of the probe is It is a flat surface, and the other surface is characterized by having a tapered shape such that the outer diameter becomes smaller toward the flat surface.

  In these inventions, the lift amount of the valve member is measured in the lift amount measurement step, and then the target of the movement restricting portion relative to the body portion is determined based on the lift amount of the valve member measured in the target fixed position calculation step. Calculate the fixed position. Furthermore, after that, in the fixed position adjustment step, the fixed position of the movement restricting unit is adjusted based on the calculated target fixed position. By passing through these processes, the injection quantity of the fluid injected from the nozzle hole of the fluid injection valve is adjusted.

  In particular, in the present invention, when the tip of the probe is inserted inside the valve member along the direction of the seating movement of the valve member, the tip of the probe protrudes toward the tip of the probe. Protrusions are formed.

  The top surface of the protrusion and the end surface of the tip of the measuring element are formed so as to be opposed to the insertion direction of the measuring element. Furthermore, either one of the top surface of the protrusion and the end surface of the measuring element is a flat surface, and the other surface has a tapered shape such that the outer diameter becomes smaller toward the flat surface.

  For this reason, when the probe is inserted into the valve member in the lift amount measurement step, the surface area of the flat surface is the area of the tapered tip surface even if the probe is displaced in a direction crossing the insertion direction for some reason. Therefore, the end surface of the tip of the probe can be abutted against the top surface of the protrusion.

  In addition, since either the top surface of the protrusion or the end surface of the tip of the probe is a flat surface, even if the probe is slightly displaced in the direction intersecting the insertion direction, the end surface of the probe The position in the axial direction with respect to the valve member of the end surface when the is abutted against the top surface of the protrusion does not change. For this reason, since the position of the axial direction with respect to the valve member of the end face of a measuring element does not change, lift amount measurement accuracy can be improved.

  Further, in the present invention, since the fixed position of the movement restricting portion is adjusted based on the target fixed position of the movement restricting portion calculated based on the lift amount whose measurement accuracy is increased, the adjustment accuracy of the injection amount is finally obtained. Can be improved.

  Further, the invention described in claims 2 and 6 is characterized in that the flat surface is a surface substantially perpendicular to the insertion direction of the measuring element. Specifically, according to these inventions, the flat surface formed on either the top surface of the protrusion or the end face of the probe is a surface substantially perpendicular to the insertion direction of the probe. Therefore, when the end surface of the tip of the probe is abutted against the top surface of the protrusion, the axial position of the end surface with respect to the valve member changes substantially even if the probe deviates in the direction intersecting the insertion direction. do not do.

  For this reason, the measurement accuracy of the lift amount can be increased, and as a result, the adjustment accuracy of the injection amount can be improved. The term “substantially vertical surface” as used herein means a surface that does not affect the measurement error of the measuring device used in the lift amount measurement process.

  The invention described in claims 3 and 7 is characterized in that the tapered shape has an outer diameter that decreases toward the center of the flat surface. According to these inventions, specifically, the tapered shape formed on either the top surface of the protrusion or the end surface of the measuring element has a small outer diameter so as to go to the center of the flat surface.

  By configuring the tapered shape in this way, even if the tapered end surface deviates in the direction intersecting the measuring element insertion direction, the end surface is directed toward the center of the flat surface. Therefore, a certain amount of deviation can be allowed. Therefore, it is possible to improve the accuracy with which the tapered end surface is abutted against the flat surface, and to further increase the measurement accuracy of the lift amount.

  According to the fourth and eighth aspects of the present invention, the body portion includes a guide portion that supports the outer side portion of the valve member so that the valve member can reciprocate in the body portion and guides the contact portion of the valve member to the valve seat. The top surface of the protrusion is located between the guide portion and the contact portion.

  According to these inventions, since the guide portion that supports the outside of the side portion of the valve member is formed in the body portion, movement of the valve member in the radial direction can be restricted by this guide portion. When the top surface of the projection is positioned between the guide portion and the contact portion, when the valve member is moved in the seating direction, the top surface moves toward the guide portion.

  For this reason, since the movement to the direction which cross | intersects the separation direction of the said top surface is controlled by the guide part, the shift | offset | difference to the said direction can be suppressed. Therefore, since the top surface is located between the guide portion and the contact portion, it is possible to prevent the tip of the measuring element from coming off from the top surface during the measurement of the lift amount of the valve member. Measurement accuracy can be increased.

It is sectional drawing which shows the whole structure of the fuel injection valve to which the injection quantity adjustment method by 1st Embodiment of this invention is applied. It is a flowchart which shows the injection quantity adjustment procedure. It is a figure which shows the whole structure of the press injection apparatus used at the time of injection quantity adjustment. It is a figure which shows the whole structure of the lift amount measuring apparatus used at the time of injection amount adjustment. It is sectional drawing which showed the principal part of the needle of the assembly at the time of lift amount measurement. It is a figure which shows the whole structure of the injection quantity measuring device used at the time of injection quantity adjustment. It is sectional drawing which showed the principal part of the needle of the fuel injection valve by 2nd Embodiment. It is sectional drawing which showed the principal part of the needle of the fuel injection valve by 3rd Embodiment.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, in each embodiment, the description which overlaps abbreviate | omitting by attaching | subjecting the same code | symbol to a corresponding component.

(First embodiment)
An example in which the injection amount adjusting method according to the first embodiment of the present invention is applied to a fuel injection valve for a gasoline engine is shown in FIGS. FIG. 1 shows the overall structure of a fuel injection valve 10 as a fluid injection valve. FIG. 5 is a cross-sectional view showing a main part of the fuel injection valve 10. The structure of the fuel injection valve 10 will be described with reference to FIGS. 1 and 5.

(Structure of fuel injection valve)
A fuel injection valve 10 shown in FIG. 1 is mounted on a main body of a gasoline engine and injects fuel into an intake passage connected to a combustion chamber of the main body. The fuel injection valve 10 includes a body part 11, a needle 50, an electromagnetic actuator 60, and the like.

  The body portion 11 is formed in a cylindrical shape, and has a fuel passage 21 through which fuel flows from one upper end portion to the other lower end portion in the drawing. In the present embodiment, one end is a base end and the other end is a front end. A fuel inlet portion 22 for introducing fuel into the fuel passage 21 is formed at the base end portion of the body portion 11, and a plurality of injection holes 41 for communicating the fuel passage 21 and the outside are formed at the distal end portion. Further, a valve seat 31 on which the needle 50 is seated is formed on the inner side of the fuel passage 21 on the distal end side.

  The needle 50 is formed of a metal material in a bottomed cylindrical shape, and is accommodated in the fuel passage 21 so as to be reciprocally movable. The needle 50 has a contact portion 51 that can be attached to and detached from the valve seat 31 outside the bottom portion. When the contact portion 51 is seated on the valve seat 31, the fuel flow to the nozzle hole 41 is blocked, and the fuel injection from the nozzle hole 41 is stopped. When the contact portion 51 is separated from the valve seat 31, the fuel flow to the nozzle hole 41 is permitted, and the fuel is injected from the nozzle hole 41.

  The electromagnetic actuator 60 is an actuator that is attached to the body portion 11 and generates power for reciprocating the needle 50 by switching between supply and non-supply of current. When a current is supplied to the electromagnetic actuator 60, power is generated to move the needle 50 to the electromagnetic actuator 60 in the base end side, that is, the direction in which the contact portion 51 is separated from the valve seat 31. As a result, the contact portion 51 is separated from the valve seat 31.

  When the supply of current to the electromagnetic actuator 60 is stopped, power is generated to move the needle 50 to the electromagnetic actuator 60 in the leading end side, that is, the direction in which the contact portion 51 is seated on the valve seat 31. Thereby, the contact portion 51 is seated on the valve seat 31.

  Next, each element 11, 50, 60 will be described in detail. The body part 11 includes a pipe 20, a valve body 30, a nozzle hole plate 40, and the like.

  The pipe 20 is not formed of a metal magnetic material, and is formed in a cylindrical shape so that the inner diameter is substantially the same in the axial direction. The pipe 20 is made of, for example, stainless steel. A fuel passage 21 is formed in the inner wall 23 of the pipe 20.

  The pipe 20 has a first magnetic part 24, a nonmagnetic part 25, and a second magnetic part 26 in this order from the base end side. The nonmagnetic part 25 is a part that suppresses a short circuit of the magnetic flux between the first magnetic part 24 and the second magnetic part 26.

  The first magnetic part 24, the nonmagnetic part 25, and the second magnetic part 26 are joined together by laser welding or the like. The pipe 20 may be formed by magnetizing or demagnetizing a part of the cylindrical object by heat processing or the like. Further, the pipe 20 may be formed of only a magnetic material, and a cross-sectional area at a position corresponding to the nonmagnetic portion 25 may be made smaller than other portions.

  A fuel inlet portion 22 for introducing fuel into the fuel passage 21 is formed at the base end portion of the pipe 20. A fuel pipe (not shown) is connected to the base end portion of the pipe 20. On the outside of the pipe 20 near the fuel inlet 22, an O-ring 27 is mounted to make the space between the pipe 20 and the fuel pipe liquid-tight. Further, a filter 28 that captures foreign matters contained in the fuel flowing from the fuel inlet 22 is provided inside the pipe 20 near the fuel inlet 22.

  The valve body 30 is formed in a cylindrical shape from a metal material, and is installed on the distal end side of the second magnetic portion 26. The valve body 30 is joined to the second magnetic part 26 by welding, for example. The inner wall of the valve body 30 is a conical surface whose inner diameter becomes smaller toward the tip. An annular valve seat 31 on which the contact portion 51 of the needle 50 is seated is formed on this conical surface. Inside the side part of the valve body 30, the side part outside of the needle 50 is supported so that the needle 50 can reciprocate along the axial direction of the pipe 20, and the contact part 51 of the needle 50 is guided to the valve seat 31. A guide portion 32 is formed. The guide portion 32 has a shape that protrudes from the inner side of the valve body 30 toward the central axis.

  As shown in FIG. 5, the nozzle hole plate 40 is formed of a metal material in a bottomed cylindrical shape. The nozzle hole plate 40 is joined to the outer side of the valve body 30 by welding or the like so that the bottom of the nozzle hole plate 40 covers the opening on the tip side of the valve body 30. A plurality of nozzle holes 41 are formed at the bottom of the nozzle hole plate 40 so as to communicate the fuel passage 21 with the outside. A cover 42 is attached to the outside of the nozzle hole plate 40 to cover the area other than the area where the nozzle holes 41 of the nozzle hole plate 40 are formed.

  The needle 50 is formed of a metal material in a bottomed cylindrical shape, and a passage 52 through which fuel can be circulated is formed in the inner cavity. In addition, the needle 50 has a plurality of fuel holes 53 penetrating the side portions. In the present embodiment, four fuel holes 53 are formed on the side of the needle 50 in four rows in the axial direction and four rows per row.

  Among the plurality of fuel holes 53, the specific fuel hole 53 is formed so as to straddle the guide portion 32 of the valve body 30 in the axial direction. This specific fuel hole 53 is formed so as to always straddle the guide portion 32 in the axial direction while the needle 50 performs the seating operation. As a result, in the state where the guide portion 32 supports the side portion of the needle 50, the fuel on the proximal end side rather than the contacted portion is supplied to the nozzle hole 41 on the distal end side even if both are always in contact. Can do.

  The needle 50 of the present embodiment is formed by a metal powder injection molding method (Metal Injection Molding). The metal powder injection molding method is a manufacturing method in which metal powder is kneaded with a binder so that injection molding can be performed like plastic, and after the injection molding, the binder is removed by heating and sintered into a single metal. By forming the needle 50 by this method, the needle 50 having a complicated shape can be easily formed.

  When the needle 50 moves to the proximal end side and the contact portion 51 moves away from the valve seat 31, a gap is formed between the contact portion 51 and the valve seat 31, and the fuel passage 21 and the injection hole 41 communicate with each other. To do. When the needle 50 moves to the distal end side and the contact portion 51 is seated on the valve seat 31, the gap disappears and the communication between the fuel passage 21 and the injection hole 41 is blocked.

  The clearance is determined by the amount of movement of the needle 50 in the separating direction. If the gap is large, the amount of fuel supplied to the nozzle hole 41 increases, and the amount of fuel injected from the nozzle hole 41 increases. This injection amount also changes depending on the size of the injection hole 41. When the gap is the same, the larger the size of the nozzle hole 41, the larger the injection amount. Even if the gap is enlarged, the injection amount becomes substantially constant at the gap. This is because, even if the amount of fuel supplied to the nozzle hole 41 increases, the quantity injected from the nozzle hole 41 is limited by the nozzle hole 41.

  The electromagnetic actuator 60 includes a movable core 61, a fixed core 64, a spring 67, an adjusting pipe 68, a coil 69, a housing 70, and the like.

  The movable core 61 is formed in a cylindrical shape from a metal magnetic material. The movable core 61 is made of stainless steel, for example. The movable core 61 is accommodated in the fuel passage 21 so as to reciprocate together with the needle 50. A needle 50 is joined to the movable core 61 on the tip side by welding or the like. As a result, the movable core 61 reciprocates in the fuel passage 21 together with the needle 50. The movable core 61 is magnetically connected to the pipe 20.

  The movable core 61 is formed with a vertical hole 62 that communicates the end on the distal end side and the end on the proximal end side. The vertical hole 62 is connected to the passage 52 of the needle 50. A stepped portion 63 on which the spring 67 is seated is formed inside the vertical hole 62.

  The fixed core 64 is formed in a cylindrical shape from a metal magnetic material. As shown in FIG. 1, the fixed core 64 is installed such that the suction portion 65 of the fixed core 64 faces the end portion on the proximal end side of the movable core 61. The fixed core 64 is inserted from the fuel inlet portion 22 of the pipe 20 and is fixed to the pipe 20 by being press-fitted into the inner wall 23 of the pipe 20. A gap corresponding to the lift amount of the needle 50 between the suction portion 65 of the fixed core 64 and the end portion on the proximal end side of the movable core 61 in a state where the contact portion 51 of the needle 50 is seated on the valve seat 31. Is formed.

  The fixed core 64 is magnetically connected to the pipe 20 and the movable core 61. When magnetic flux flows through the fixed core 64 and the movable core 61, a magnetic attraction force that is a force for attracting the movable core 61 toward the fixed core 64 is generated between the suction portion 65 of the fixed core 64 and the movable core 61. . The fixed core 64 is formed with a vertical hole 66 that communicates the end portion on the distal end side and the end portion on the proximal end side. The vertical hole 66 is connected to the vertical hole 62 of the movable core 61, and guides the fuel that has flowed into the fuel passage 21 from the fuel inlet 22 into the vertical hole 62 of the movable core 61.

  The spring 67 is a coil spring formed by spirally winding a wire made of an elastic material. The spring 67 is accommodated in the vertical holes 66 and 62 of the fixed core 64 and the movable core 61 in a state of being contracted in the axial direction. The end of the spring 67 on the front end side is seated on the stepped portion 63. The spring 67 biases the needle 50 toward the distal end side via the movable core 61.

  The adjusting pipe 68 is a cylindrical member that is fixed by press-fitting into the vertical hole 66 of the fixed core 64. The adjusting pipe 68 is a member that supports the end of the spring 67 on the base end side, and the urging force can be adjusted by adjusting the fixing position with respect to the vertical hole 66.

  The coil 69 is a magnetic flux generation unit that generates a magnetic flux installed outside the pipe 20. The coil 69 is formed by winding a conductive electric wire around the outer wall of a spool formed in a cylindrical shape made of resin. A terminal 71 for supplying a current to the electric wire from the outside is electrically connected to the electric wire of the coil 69. When a current is supplied to the electric wire via the terminal 71, the coil 69 generates a magnetic flux.

  Further on the outer side of the coil 69 is a metal magnetic material that forms a magnetic circuit in which the magnetic flux generated in the coil 69 goes around the first magnetic part 24, the fixed core 64, the movable core 61, and the second magnetic part 26. A housing 70 is installed. The housing 70 is made of, for example, stainless steel. The housing 70 is formed so as to cover the coil 69 outside the pipe 20 and to magnetically connect the first magnetic part 24 and the second magnetic part 26.

  Thus, the magnetic circuit which goes around the 1st magnetic part 24, the fixed core 64, the movable core 61, the 2nd magnetic part 26, and the housing 70 by mounting | wearing the pipe 20 with the fixed core 64, the movable core 61, and the housing 70. Is formed.

  As shown in FIG. 1, the outside of the coil 69, a part of the pipe 20, a part of the housing 70, and a part of the terminal 71 are covered with an insulating resin housing 72.

  According to the above configuration, the fuel that passes through the filter 28 from the fuel inlet 22 and flows into the pipe 20 flows into the adjusting pipe 68, the vertical hole 66 of the fixed core 64, the spring 67, and the vertical hole 62 of the movable core 61. The gap between the outside of the needle 50 and the inside of the valve body 30 is reached through the passage of the needle 50 and the fuel hole 53.

  When the supply of current to the coil 69 is stopped, the needle 50 is biased to the distal end side by the spring 67 together with the movable core 61, and the contact portion 51 is seated on the valve seat 31. At this time, since the fuel flow to the nozzle hole 41 is blocked, fuel injection from the nozzle hole 41 is stopped.

  When a current is supplied to the coil 69, a magnetic flux is generated from the coil 69, and the magnetic flux goes around in the magnetic circuit described above. Then, a magnetic attractive force is generated between the fixed core 64 and the movable core 61. When this magnetic attractive force exceeds the urging force of the spring 67, the movable core 61 starts moving toward the attractive portion 65 of the fixed core 64 together with the needle 50. When the needle 50 moves toward the suction part 65, the contact part 51 moves away from the valve seat 31, and the fuel flow to the nozzle hole 41 is permitted. Thereby, fuel is injected from the injection hole 41.

  When the current supply to the coil 69 is stopped, the magnetic flux around the magnetic circuit disappears. When the magnetic flux disappears, the magnetic attractive force decreases. When the magnetic attractive force is lower than the urging force of the spring 67, the movable core 61 starts moving toward the valve seat 31 together with the needle 50. When the needle 50 moves toward the valve seat 31 and the contact portion 51 is seated on the valve seat 31, the flow of fuel to the injection hole 41 is blocked, and the fuel injection from the injection hole 41 is stopped.

  The configuration of the fuel injection valve 10 has been described above. Next, an adjustment method for adjusting the injection amount of the fuel injection valve 10 will be described with reference to FIGS.

  FIG. 2 shows a procedure for adjusting the injection amount. FIG. 3 shows an outline of the press-fitting device 200. FIG. 4 shows an outline of the lift amount measuring apparatus 300, and FIG. 5 shows the vicinity of the tip of the needle 50 of the fuel injection valve 10 when the lift amount measuring apparatus 300 measures the lift amount. . FIG. 6 shows an outline of the injection amount measuring apparatus 400.

  In the injection amount adjusting method of the present embodiment, the injection amount is adjusted by adjusting the gap between the fixed core 64 and the movable core 61 by adjusting the press-fitting and fixing position of the fixed core 64 with respect to the pipe 20. . When adjusting the injection amount, each apparatus shown in FIGS. 3, 4, and 6 is used.

  First, the configuration of each device will be described. A press-fitting device 200 shown in FIG. 3 is a device that press-fits the fixed core 64 into a predetermined position. The press-fitting device 200 includes a jig 210, a press-fit pin 220, a drive unit 230, a control unit 240, and the like.

  The jig 210 is a member that supports the assembly 100 to which the fixed core 64 is press-fitted. The jig 210 has an insertion hole 211 into which the distal end side of the assembly 100 can be inserted at the center, and a support portion 212 that supports the housing 70 at the peripheral edge of the insertion hole 211. The support portion 212 is configured to receive a force from the proximal end side to the distal end side applied to the assembly 100.

  Here, the assembly 100 refers to a state in which parts necessary for adjusting the injection amount are assembled. In this embodiment, components other than the spring 67, the adjusting pipe 68, and the filter 28 are assembled. It is a thing of the state.

  The press-fit pin 220 is formed in a rod shape from a metal material. The outer diameter of the press-fit pin 220 is smaller than the inner diameter of the pipe 20. The press-fit pin 220 is inserted into the inside from the fuel inlet portion 22 of the assembly 100 toward the front end side. By moving the press-fit pin 220 to the front end side, the fixed core 64 is pushed to the front end side by the press-fit pin 220.

  The drive unit 230 is a drive unit that moves the press-fit pin 220 to the tip side. The drive unit 230 is electrically connected to the control unit 240, and includes a drive circuit that receives a command signal from the control unit 240, an actuator that operates according to the electrical signal from the drive circuit, and moves the press-fit pin 220 to the distal end side. Has been. The actuator in the drive unit 230 may be of any type as long as the press-fit pin 220 can be moved in the axial direction. For example, the actuator may be composed of an electric motor and a converter that converts the rotational force of the electric motor into linear motion, or may be composed of a hydraulic pressure generator and a hydraulic device that uses the generated hydraulic pressure as a drive source. good.

  The control unit 240 is a control unit that controls the operation of the drive unit 230 by generating a command signal for operating the drive unit 230 and sending the command signal to the drive unit 230. The control unit 240 is configured by a known microcomputer that includes a central processing unit, various memories, an input / output device, and the like. The central processing unit generates the command signal based on the processing programs stored in various memories, and controls the input / output device so that the generated command signal is sent to the drive unit 230. The command signal generated by the central processing unit is a signal that operates the drive unit 230 so that the press-fit pin 220 moves by a predetermined movement amount. The control unit 240 is electrically connected to the control units 350 and 460 of the devices 300 and 400 described later, and generates the command signal using the measurement values obtained from the control units 350 and 460.

  A lift amount measuring device 300 shown in FIG. 4 is a device that measures the lift amount of the needle 50. In the present embodiment, the lift amount of the needle 50 corresponds to the gap between the fixed core 64 and the movable core 61 in a state where the contact portion 51 of the needle 50 is seated on the valve seat 31. The lift amount measuring apparatus 300 measures the lift amount by measuring the amount of movement of the needle 50 in the axial direction when the needle 50 is moved away from and seating on.

  The lift amount measuring apparatus 300 includes a jig 310, a measuring element 320, a measuring unit 330, an energizing unit 340, a control unit 350, and the like. Similar to the press-fitting device 200 shown in FIG. 3, the jig 310 is a member that supports the assembly 100 when measuring the lift amount. The jig 310 has an insertion hole 311 into which the distal end side of the assembly 100 can be inserted at the center, and a support portion 312 that supports the housing 70 at the peripheral edge of the insertion hole 311. The support portion 312 is configured to receive a force from the proximal end side to the distal end side applied to the assembly 100.

  The measuring element 320 is a metal rod formed in a cylindrical shape, and is configured to be installed along each axis of the pipe 20 and the needle 50. An end surface 322 of the tip 321 of the probe 320 is a plane that is substantially perpendicular to the axis of the probe 320 and is a flat surface. The end surface 322 of the probe 320 is configured to abut against the top surface 55 of the protrusion 54 formed on the inner side of the bottom of the needle 50 as shown in FIG. The measuring element 320 is configured such that the end surface 322 reciprocates in the axial direction following the separation / seating operation of the needle 50.

  In the present embodiment, a certain amount of force toward the distal end side is applied to the probe 320 so that the end surface 322 of the probe 320 is always in contact with the top surface 55 of the protrusion 54 even if the needle 50 is moved away and seated. Has been granted.

  As shown in FIG. 5, a protrusion 54 that protrudes toward the end surface 322 of the probe 320 is formed inside the bottom of the needle 50. In this embodiment, as shown in the figure, the top surface 55 of the protrusion 54 and the end surface 322 of the measuring element 320 are formed so as to be opposed to the insertion direction of the measuring element 320.

  The top surface 55 of the protrusion 54 has a tapered shape such that the outer diameter becomes smaller toward the flat surface while the end surface 322 of the probe 320 is a flat surface. Specifically, the surface of the top surface 55 is a spherical surface. When the measuring element 320 is inserted along the axis of the needle 50, the spherical surface is formed so that the end surface of the spherical surface, that is, the portion in contact with the flat surface is directed toward the center of the flat surface. The protrusion 54 is formed such that the top surface 55 is located between the guide portion 32 described with reference to FIG. 1 and the contact portion 51 of the needle 50.

  The flat surface in the present embodiment is formed larger than the area of the portion of the top surface 55 of the projection 54 formed on the inner side of the bottom of the needle 50 that contacts the end surface 322 of the probe 320. In addition, the area of the flat surface is a size that takes into account the deviation in the direction intersecting the insertion direction assumed when the measuring element 320 is inserted into the assembly 100. Further, the surface that is substantially perpendicular to the insertion direction of the probe 320 is a surface that does not affect the measurement error of the lift amount measuring apparatus 300.

  The measuring unit 330 is installed on the base end side of the measuring element 320, and is a means for measuring the amount of movement in the axial direction of the end surface 322 of the measuring element 320 when the needle 50 moves in and out as a lift amount of the needle 50. is there. The lift amount data measured by the measurement unit 330 is sent to the control unit 350 that is electrically connected to the measurement unit 330.

  The energization unit 340 is a means for supplying and not supplying current to the coil 69. The energization unit 340 is electrically connected to the terminal 71. The energization unit 340 is electrically connected to the control unit 350, and supplies or does not supply current to the coil 69 in response to a command signal from the control unit 350.

  The control unit 350 generates a command signal to the energization unit 340, sends the command signal to the energization unit 340, and operates the energization unit 340. As a result, the lift amount of the needle 50 measured by the measurement unit 330 is determined. A means of receiving data.

  Similar to the control unit 240 of the press-fitting device 200 shown in FIG. 3, the control unit 350 is configured by a known microcomputer including a central processing unit, various memories, an input / output device, and the like. The central processing unit generates the command signal based on processing programs stored in various memories, and controls the input / output device so that the generated command signal is sent to the energization unit 340. Further, the central processing unit receives lift amount data via the input / output device, and sends the data to the control unit 240 of the press-fitting device 200 shown in FIG.

  The injection amount measuring device 400 shown in FIG. 6 is a device that measures the injection amount injected from the injection hole 41. The injection amount measuring apparatus 400 measures the injection amount by actually flowing the fluid into the assembly 100 and measuring the injection amount of the fluid injected from the injection hole 41. The injection amount measuring device 400 includes a jig 410, a tank 420, a pump 430, a flow meter 440, an energization unit 450, a control unit 460, and the like.

  The jig 410 is substantially the same as the jigs 210 and 310 shown in FIGS. 3 and 4, and is a member that supports the assembly 100. The jig 410 has an insertion hole 411 into which the distal end side of the assembly 100 can be inserted at the center part, a support part 412 that supports the housing 70 at the peripheral part of the insertion hole 411, and a discharge that discharges the test oil injected from the injection hole 41. Part 413. The discharge unit 413 is connected to the tank 420.

  The tank 420 is a container for storing test oil supplied to the assembly 100. In the present embodiment, a test oil generated for a test whose physical properties are similar to those of fuel is used instead of fuel (gasoline) as a fluid used at the time of measurement.

  The pump 430 pumps up the test oil stored in the tank 420 and supplies the test oil to the fuel inlet 22 of the assembly 100 through the pipe 470 at a predetermined pressure (see FIGS. 1 and 6). The pump 430 is electrically connected to the control unit 460 and operates based on a command signal from the control unit 460. A flow meter 440 for measuring the flow rate of the test oil flowing through the pipe 470 is installed in the pipe 470 between the pump 430 and the fuel inlet 22.

  The flow meter 440 is a means for measuring the flow rate of the test oil passing through the flow meter 440 as an injection amount injected from the injection hole 41. The flow meter 440 is, for example, a gear pump type (volume type) flow meter. The flow meter 440 is configured to detect and correct the pressure difference at the inlet / outlet of the flow meter 440 so that the flow rate of the test oil can be accurately measured. The flow rate data measured by the flow meter 440 is sent to the control unit 460 that is electrically connected to the flow meter 440.

  The energization unit 450 is a means for supplying and not supplying current to the coil 69. The energization unit 450 is electrically connected to the terminal 71. The energization unit 450 is electrically connected to the control unit 460, and supplies or does not supply current to the coil 69 in response to a command signal from the control unit 460.

  The control unit 460 generates command signals to the pump 430 and the energization unit 450, sends the command signals to both elements 430 and 450, operates both elements 430 and 450, and the nozzle hole measured by the flow meter 440 41 is means for receiving injection amount data when test oil is being injected from 41.

  Similar to the control units 240 and 350 shown in FIGS. 3 and 4, the control unit 460 is configured by a known microcomputer including a central processing unit, various memories, an input / output device, and the like. The central processing unit generates the command signal based on processing programs stored in various memories, and controls the input / output device so that the generated command signal is sent to the energization unit 450 and the pump 430. Further, the central processing unit receives the injection amount data via the input / output device, and sends the data to the control unit 240 of the press-fitting device 200 shown in FIG.

  The configuration of each device 200, 300, 400 has been described above. Next, the procedure of the injection amount adjustment process will be described with reference to the flowchart of FIG. 2 and FIGS. 3 to 6.

  The injection amount adjustment process starts after the assembly 100 is installed in the jig 210 of the press-fitting device 200 shown in FIG. In step S10 (hereinafter simply referred to as “S10”, the same applies to other steps), the fixed core 64 is roughly press-fitted using the press-fitting device 200 shown in FIG. In S10, the fixed core 64 is press-fitted into a position before the press-fitting and fixed position where a prescribed lift amount and a prescribed injection amount are obtained.

  In S20, the lift amount of the needle 50 after the rough press-fitting operation is measured using the lift amount measuring apparatus 300 shown in FIG. Specifically, after the assembly 100 is installed on the jig 310, the probe 320 is inserted from the fuel inlet 22, and the end surface 322 of the probe 320 is inserted into the protrusion 54 of the needle 50 as shown in FIG. 5. It strikes against the top surface 55. Thereafter, a command signal is issued from the control unit 350 to the energization unit 340 so as to repeat supply / non-supply of current to the coil 69 a plurality of times. By repeating the supply / non-supply of current from the energization unit 340 to the coil 69 a plurality of times, the needle 50 performs the separation / seating operation.

  The needle 50 reciprocates along the axial direction. At this time, a plurality of lift amount data is sent from the measurement unit 330 to the control unit 350. The control unit 350 sends an average value of a plurality of lift amount data to the control unit 240 of the press-fitting device 200.

  Next, in S30, the injection amount injected from the injection hole 41 after the rough press-fitting work is measured using the injection amount measuring device 400 shown in FIG. Specifically, after the assembly 100 is installed on the jig 410, the pipe 470 is connected to the fuel inlet 22, and the pump 430 and the energization unit 450 are operated by a command signal from the control unit 460. As a result, the pump 430 pumps the test oil from the tank 420 and supplies the test oil to the assembly 100. A current is supplied from the energization unit 450 to the coil 69 in a state where the assembly 100 is filled with the test oil. When a current is supplied to the energization unit 450, the needle 50 moves in the separation direction. For this reason, test oil is injected from the nozzle hole 41.

  At this time, the injection amount data is sent from the flow meter 440 to the control unit 460. The control unit 460 calculates the injection amount per unit time from the injection amount data sent from the flow meter 440 and sends the calculated data to the control unit 240 of the press-fitting device 200.

  Next, in S40, the control unit 240 of the press-fitting device 200 performs the control on the pipe 20 of the fixed core 64 based on the average value of the lift amount and the flow rate per unit time sent from the control units 350 and 460 in S30. The target fixed position is calculated, and the target press-fitting amount from the current position of the fixed core 64 is calculated based on the calculated target fixed position. In the present embodiment, the control unit 240 is data regarding the correlation between the lift amount and the injection amount per unit time when the fuel injection valve stored in various memories is manufactured with a predetermined size and a predetermined lift amount. The target lift position and the target press-fit amount are calculated by comparing the current lift amount and the injection amount per unit time.

  In S 50, a command signal for moving the press-fit pin 220 toward the distal end side by an amount corresponding to the target press-fit amount calculated by the control unit 240 is sent from the control unit 240 to the drive unit 230. Based on the command signal, the drive unit 230 moves the press-fit pin 220 to the distal end side, and moves the fixed core 64 by an amount corresponding to the target press-fit amount. This operation becomes the precision press-fitting of the fixed core 64.

  In S60, similarly to S20, the lift amount of the needle 50 after the precision press-fitting operation is measured using the lift amount measuring apparatus 300 shown in FIG. In S70, as in S30, the injection amount per unit time that is injected from the injection hole 41 after the precision press-fitting operation is measured using the injection amount measuring device 400 shown in FIG.

  In S80, the control unit 240 determines whether or not the lift amount and the injection amount measured in S60 and S70 are within the predetermined ranges set in advance. If both measured values are within the corresponding prescribed ranges, the injection amount adjustment process ends. If any one of the values is not within the corresponding specified range, the process returns to S40, and the control unit 240 calculates the target fixed position and the target press-fitting amount of the fixed core 64 again, and based on the calculated result. Then, the processing of S50 to S70 is executed. After the adjustment process is performed, the spring 67 and the adjusting pipe 68 are assembled to the assembly 100 to complete the fuel injection valve 10.

  According to the present embodiment described above, as shown in FIG. 5, the end surface 322 that is a flat surface has a spherical surface on the surface of the protrusion 54 that protrudes toward the probe 320 inside the bottom of the needle 50. The lift amount of the needle 50 is measured by causing the needle 50 to move away and in a state where the needle 50 is in contact with the top surface 55.

  In the present embodiment, the end surface 322 is a flat surface, and the top surface 55 of the projection 54 that contacts the end surface 322 is a spherical surface, so that the measuring element 320 is inserted into the needle 50 of the assembly 100. When the probe 320 is displaced for some reason in the direction intersecting the insertion direction as shown by the one-dot chain line or the two-dot chain line in FIG. 5, the surface area of the end surface 322, which is a flat surface, is The end surface 322 can be abutted against the top surface 55 of the projecting portion 54 because the end surface 322 is formed to be very large compared to the area of the end surface of the top surface 55 that is a spherical surface.

  Furthermore, since the end surface 322 is a flat surface, even when the probe 320 is slightly displaced in the direction as described above, the end surface 322 is abutted against the top surface 55 of the protrusion 54. The position of the end surface 322 in the axial direction with respect to the needle 50 does not change. Further, when the needle 50 is moved away from and seated on, the position in the axial direction with respect to the needle 50 does not change even if the probe 320 is displaced in that direction. Therefore, the measurement accuracy at the time of lift amount measurement can be improved.

  In the present embodiment, the fixed position of the fixed core 64 is adjusted based on the target fixed position and the target press-fitting amount of the fixed core 64 calculated based on the lift amount obtained in a state where the measurement accuracy is increased. Therefore, the adjustment accuracy of the injection amount finally adjusted is improved.

  Further, in the present embodiment, the flat surface formed on the end surface 322 is a surface that is substantially perpendicular to the insertion direction of the measuring element 320, and thus the end surface 322 projects as described above. The position of the end surface 322 in the axial direction with respect to the needle 50 when abutting against the top surface 55 of the portion 54 hardly changes even if the probe 320 is displaced in the direction. For this reason, the measurement accuracy of the lift amount can be increased.

  Further, the spherical surface formed on the top surface 55 of the projection 54 is formed such that the end surface of the spherical surface abuts against the center of the end surface 322 and the outer diameter becomes smaller toward the end surface 322. . For this reason, even if the end surface 322 is displaced in the direction, since the spherical end surface is directed toward the center of the end surface 322, a certain amount of displacement can be allowed. For this reason, the accuracy of abutting the end surface 322 against the top surface 55 of the protrusion 54 can be improved, and the measurement accuracy of the lift amount can be further increased.

  In addition, in the present embodiment, the top surface 55 of the protruding portion 54 is located between the guide portion 32 of the valve body 30 and the contact portion 51 of the needle 50. The guide part 32 also has a function of restricting the movement of the needle 50 in this direction. When the contact portion 51 of the needle 50 is moved away from the valve seat 31 when the lift amount is measured, the top surface 55 of the protrusion 54 approaches the guide portion 32. According to this, the movement of the top surface 55 in the direction is restricted.

  Since the movement of the top surface 55 in the direction when the needle 50 moves in the separating direction is restricted, it is possible to suppress the end surface 322 from being detached from the top surface 55 during the lift amount measurement. Measurement accuracy can be increased.

  In the present embodiment, the needle 50 and the movable core 61 correspond to a “valve member” recited in the claims, and the fixed core 64 corresponds to a “movement restricting portion” recited in the claims. In the present embodiment, the end surface 322 of the probe 320 is described as “one surface” recited in the claims, and the top surface 55 of the protrusion 54 of the needle 50 is defined as “the other surface” recited in the claims. " Further, in the present embodiment, step S20 in the flowchart shown in FIG. 2 corresponds to the “lift amount measuring step” recited in the claims, and part of the processing in step 40 is the “target” recited in the claims. This corresponds to the “fixed position calculating step”, and step 50 corresponds to the “fixed position adjusting step” recited in the claims.

(Second Embodiment)
The second embodiment is a modification of the first embodiment. In the second embodiment, as shown in FIG. 7, the shape of the end surface 322 of the probe 320 and the shape of the top surface 55 of the protrusion 54 of the needle 50 are opposite to those in the first embodiment. The end surface 322 of the probe 320 is a spherical surface that protrudes toward the protrusion 54, and the top surface 55 of the protrusion 54 is a flat surface that is substantially perpendicular to the insertion direction of the probe 320. ing. Thus, even if the shapes of the end surface 322 of the probe 320 and the top surface 55 of the projection 54 are opposite to those in the first embodiment, the obtained effects are almost the same as those in the first embodiment.

(Third embodiment)
The third embodiment is a modification of the second embodiment. In the third embodiment, the shape of the end surface 322 of the probe 320 is different from that of the second embodiment. As shown in FIG. 8, the shape of the end surface 322 of the probe 320 according to the third embodiment is a conical shape. Thus, even when the shape of the end surface 322 of the probe 320 is not a spherical surface but a conical shape, the obtained effects are almost the same as those of the first and second embodiments.

(Other embodiments)
In the above, a plurality of embodiments have been described. The present invention is not construed as being limited to the above-described embodiments, and can be applied to various embodiments without departing from the scope of the invention.

  Either one of the end surface 322 of the probe 320 and the top surface 55 of the projection 54 facing the end surface 322 and the insertion direction of the probe 320 is a flat surface, and the other surface is directed to the flat surface. Accordingly, it is only necessary that the tapered shape has a smaller outer diameter. The tapered shape may be a spherical surface as described in the first and second embodiments, or the conical shape described in the third embodiment. Moreover, the curved surface which protrudes toward a flat surface may be sufficient.

  Further, in this embodiment, the press-fitting device 200, the lift amount measuring device 300, and the injection amount measuring device 400 are separate devices, but the press-fitting of the fixed core 64 and the needle 50 are performed by a device in which each function is integrated into one device. Measurement of the amount of lift and measurement of the amount of injection from the nozzle hole 41 may be performed.

  DESCRIPTION OF SYMBOLS 10 Fuel injection valve, 11 Body part, 20 Pipe, 21 Fuel passage, 22 Fuel inlet part, 30 Valve body, 31 Valve seat, 32 Guide part, 40 Injection hole plate, 41 Injection hole, 50 Needle (valve member), 51 Contact portion, 52 passage, 53 fuel hole, 54 protrusion, 55 top surface (the other surface), 60 electromagnetic actuator, 61 movable core (valve member), 64 fixed core (movement restricting portion), 67 spring, 68 adjuster Sting pipe, 69 coil, 70 housing, 71 terminal, 72 resin housing, 100 assembly, 200 press-fitting device, 210 jig, 220 press-fitting pin, 230 driving unit, 240 control unit, 300 lift amount measuring device, 310 jig, 320 Measuring point, 321 Tip part, 322 End face (one face), 330 Measuring part, 340 Current-carrying part, 3 50 control unit, 400 injection amount measuring device, 410 jig, 420 tank, 430 pump, 440 flow meter, 450 energization unit, 460 control unit, 470 piping

Claims (8)

A valve member having a bottomed cylindrical shape and having a contact portion on the outer side of the bottom; a valve seat in which the valve member is reciprocally movable in the axial direction; and the contact portion is seated on the inner side; and the valve seat A fluid ejector comprising: a body portion having a nozzle hole at a more distal end side; and a movement restricting portion fixed to the body portion and restricting movement of the valve member in a seating direction by contacting the valve member. In the injection amount adjustment method for adjusting the injection amount of the valve,
A lift amount measuring step for measuring the lift amount of the valve member, and a target for calculating a target fixed position of the movement restricting portion with respect to the body portion based on the lift amount of the valve member measured in the lift amount measuring step An injection amount adjusting method comprising: a fixed position calculating step; and a fixed position adjusting step of adjusting a fixed position of the movement restricting portion with respect to the body portion based on the target fixed position calculated in the target fixed position calculating step. ,
The tip of the probe protrudes toward the tip of the probe when the tip of the probe is inserted inside the valve member along the direction of the seating movement of the valve member. A protrusion is formed,
The top surface of the protrusion and the end surface of the tip of the probe are formed so as to face the insertion direction of the probe,
One of the top surface of the protrusion and the end surface of the tip of the probe is a flat surface, and the other surface has an outer diameter that decreases toward the flat surface. It has a tapered shape,
In the lift amount measuring step, the measuring member is inserted into the body portion and the valve member, and the valve member is kept in a state in which the end surface of the measuring member is abutted against the top surface of the protruding portion. An injection amount adjusting method, wherein the lift amount of the valve member is measured by performing a separation / seating operation.   The injection amount adjustment method according to claim 1, wherein the flat surface is a surface that is substantially perpendicular to an insertion direction of the probe.   The injection amount adjusting method according to claim 1, wherein the tapered shape has an outer diameter that decreases toward a central portion of the flat surface. The body part has a guide part for guiding the contact part of the valve member to the valve seat while the valve member supports the outside of the side part of the valve member so that the valve member can reciprocate in the body part,
The injection amount adjustment method according to any one of claims 1 to 3, wherein the top surface of the protrusion is located between the guide portion and the contact portion. A valve member having a bottomed cylindrical shape and having a contact portion on the outer side of the bottom; a valve seat in which the valve member is reciprocally movable in the axial direction; and the contact portion is seated on the inner side; and the valve seat A body part having a nozzle hole on the tip end side, and a movement restricting part fixed to the body part and restricting movement of the valve member in the seating direction by contacting the valve member The lift amount of the valve member is measured by moving the valve member in a state where the tip end portion of the child is in contact with the inside of the bottom portion of the valve member, and the movement is performed based on the measured lift amount. A fluid injection valve in which an injection amount is adjusted by adjusting a fixed position of the restriction unit with respect to the body part,
On the inner side of the bottom of the valve member, when the tip of the measuring element is inserted inside the valve member along the direction of the seating movement of the valve member, there is a protruding part against which the tip of the measuring element abuts. Formed,
The top surface of the protrusion and the end surface of the tip of the probe are formed so as to face the insertion direction of the probe,
One of the top surface of the protrusion and the end surface of the tip of the probe is a flat surface, and the other surface has an outer diameter that decreases toward the flat surface. A fluid injection valve having a tapered shape.   The fluid injection valve according to claim 5, wherein the flat surface is a surface that is substantially perpendicular to a direction in which the probe is inserted into the valve member.   The fluid injection valve according to claim 5 or 6, wherein the tapered shape has an outer diameter that decreases toward a central portion of the flat surface. The body part has a guide part for guiding the contact part of the valve member to the valve seat while the valve member supports the outside of the side part of the valve member so that the valve member can reciprocate in the body part,
The fluid injection valve according to any one of claims 5 to 7, wherein the top surface of the protrusion is located between the guide portion and the contact portion.

Images