JP2006250135A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of maintaining desired injection characteristics by always smoothing sliding movements of a movable element, solving adhesion of sticky material inside an oil passing groove, or preventing operation failure when closing the valve. <P>SOLUTION: The fuel injection valve comprises an injection valve body, an electromagnetic solenoid, and an opening/closing valve mechanism. The opening/closing valve mechanism filled with low-pressure fuel oil is provided with the movable element 5 driven by an energizing means and magnetic force of the electromagnetic solenoid. In the fuel injection valve with the movable element 5 having an attracting surface 5E separating from/contacting the electromagnetic solenoid, the movable element 5 is provided with a slant face where an energizing force to the rotational direction is generated by an action of the low-pressure fuel oil along with the displacement to the axial direction at an edge part of a notch 53 of a flat plate part 51, or provided with an obliquely-inclined slit at the peripheral edge part, or provided with a penetrating oil passing hole so as to be inclined, or provided with the oil passing groove having a curved surface formed to be radially bent on the attracting surface 5E. Thereby, the movable element 5 is rotated and the sliding movements are always smoothed to prevent the operation failure at the time of opening/closing the valve. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel injection valve for intermittently injecting fuel by driving an electromagnetic valve. For example, an electromagnetic for injecting high-pressure fuel pressurized by a high-pressure supply pump and accumulated in a common rail into a combustion chamber of an internal combustion engine. It is suitable for application to a controlled fuel injection valve.

[Conventional technology]
As a conventional fuel injection valve, one that is used in a pressure accumulation (common rail) type fuel injection device such as a diesel engine and injects high-pressure fuel supplied from the common rail into a combustion chamber of the engine is known (see Patent Document 1). ).

  This fuel injection valve is provided with a pressure control chamber on the non-injection side of the control piston housed inside, and controls the fuel injection timing by intermittently connecting the pressure control chamber and the fuel low pressure side with an electromagnetic valve. Also, an inflow restrictor and an outflow restrictor are provided on the fuel inflow side and the outflow side of the pressure control chamber, respectively, and the flow passage area of the outflow restrictor is made larger than the flow passage area of the inflow restrictor so that the solenoid valve is energized (ON). It is known that the armature is sucked and opened to reduce the fuel pressure in the pressure control chamber, and the needle valve is lifted together with the control piston to inject fuel.

  The above armature (movable element) acts as a valve body of the on-off valve mechanism, is urged downward (in the closing direction of the outflow restrictor) by a spring as an urging means, and is upward (outflow restrictor) by the magnetic force generated by the electromagnetic solenoid. And is displaced with a predetermined stroke up and down.

  Low pressure fuel oil is introduced into the solenoid valve, and resistance of the low pressure fuel oil is generated in the vertical displacement of the armature (mover). For this reason, it is important to reduce the resistance of the low-pressure fuel oil to improve the responsiveness. Conventionally, a plurality of notches have been provided on the outer periphery of the flat plate portion of the mover (see FIG. 7), and the responsiveness of displacement is improved by reducing the resistance of the fluid (low pressure fuel oil) and reducing the weight. ing.

[Problems with conventional technology]
As shown in FIG. 7, the conventional mover 5 is provided with a plurality of substantially V-shaped notches 53 on the outer periphery of the flat plate portion 51 at equal intervals, and on each suction surface 5 </ b> E of the flat plate portion 51. An oil passage groove 58 that communicates with the innermost portion 5A of the letter-shaped notch 53 is provided to facilitate the inflow and outflow of the oil above the flat plate portion 51 and to reduce the weight. Further, it is known that the fuel oil in the mover chamber in which the armature (mover) 5 is arranged has a high temperature when the engine is operated, and a viscous substance is generated in the fuel oil.

The viscous material generated in the mover chamber is likely to adhere to the wall of the mover chamber facing the oil passage groove 58 that is not the adsorption surface 5E of the armature 5. Since the adhesion of the viscous material is not necessarily uniform, when the armature 5 is displaced downward, a non-uniform distribution is generated in the inflow of the fuel oil above the flat plate portion 51. This distribution generates a biasing force that tilts the flat plate portion 51 with respect to the vertical movement of the armature 5, and easily causes local sliding failure in the sliding portion of the shaft portion 52 of the armature 5. As a result, there is a concern that a malfunction may occur when the electromagnetic valve 3 is closed and a predetermined injection characteristic cannot be obtained.
Japanese Patent Laid-Open No. 9-158811

  In recent years, due to the demand for precise fuel injection control and atomization of atomized fuel, the pressure of high-pressure fuel has been increasingly increased. On the other hand, the contradictory demands for small size, light weight, high durability, and reliability are strongly desired. It is rare. In other words, there is a need for improved durability and reliability of fuel injection valves under high pressure, and one of them is to prevent sliding movements concentrated on one point of the mover, or oil flow grooves against viscous substances. There is a problem of preventing the adhesion to the inside and eliminating the malfunction when the valve is closed to maintain the injection characteristics well.

  The object of the present invention is to make the sliding movement of the mover smooth at all times, or to eliminate the adhesion of sticky substances in the oil passage groove, to prevent malfunctions when the valve is closed, and to achieve desired injection characteristics. It is to provide a fuel injection valve that can be maintained efficiently.

[Means of Claim 1]
The solenoid valve includes an injection valve body and an electromagnetic valve that intermittently injects fuel from the injection valve body. The solenoid valve includes an electromagnetic solenoid and an opening / closing valve mechanism, and the opening / closing valve mechanism is an electromagnetic valve filled with low-pressure fuel oil. In the fuel injection valve having a suction surface that is separated from and in contact with the electromagnetic solenoid, the movable element is provided with a movable element shaft that is driven by the biasing means and the magnetic force of the electromagnetic solenoid. It adopts a shape characterized by providing a working surface that generates a biasing force in the rotational direction by the movement of the low-pressure fuel oil accompanying the displacement in the direction.

  According to this configuration, by moving the mover up and down while moving, it eliminates the concentrated sliding at one place, always realizes a new sliding surface and sliding, and prevents local sliding failure. . Further, the sticky substance generated in the mover chamber can be prevented from adhering to the oil passage groove, and the malfunction during valve closing can be eliminated.

[Means of claim 2]
2. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms an adsorption surface, and a plurality of notches are formed in an outer peripheral portion of the flat plate portion, and the working surface is a cut surface. A shape characterized by a slope formed on the edge of the notch is adopted.

According to this configuration, by moving the mover up and down while moving, it eliminates the concentrated sliding at one place, always realizes a new sliding surface and sliding, and prevents local sliding failure. . Further, the sticky substance generated in the mover chamber can be prevented from adhering to the oil passage groove, and the malfunction during valve closing can be eliminated.

[Means of claim 3]
3. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms an adsorption surface, and a plurality of inclined slits are formed on an outer peripheral portion of the flat plate portion, and the working surface. Adopts a shape characterized by being constituted by the slope of the slit.

  According to this configuration, by moving the mover up and down while moving, it eliminates the concentrated sliding at one place, always realizes a new sliding surface and sliding, and prevents local sliding failure. . Further, the sticky substance generated in the mover chamber can be prevented from adhering to the oil passage groove, and the malfunction during valve closing can be eliminated.

[Means of claim 4]
3. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms an adsorption surface, and a predetermined circle at a notch portion between the cutout of the flat plate portion. An oil passage hole arranged on the circumference is formed so as to be inclined with respect to the axial direction, and the working surface is formed by a slope of the oil passage hole.

  According to this configuration, by moving the mover up and down while moving, it eliminates the concentrated sliding at one place, always realizes a new sliding surface and sliding, and prevents local sliding failure. . Further, the sticky substance generated in the mover chamber can be prevented from adhering to the oil passage groove, and the malfunction during valve closing can be eliminated.

[Means of claim 5]
3. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms an adsorption surface, and the adsorption surface has an oil passage groove that communicates a central portion and an outer peripheral portion of the adsorption surface. The working surface has a shape characterized by a curved surface formed by radially bending the oil passage groove.

  According to this configuration, by moving the mover up and down while moving, it eliminates the concentrated sliding at one place, always realizes a new sliding surface and sliding, and prevents local sliding failure. . Further, the sticky substance generated in the mover chamber can be prevented from adhering to the oil passage groove, and the malfunction during valve closing can be eliminated.

  The best mode of the present invention will be described together with Example 1 shown in the drawings.

[Configuration of Example 1]
FIG. 1 shows an electromagnetically controlled fuel injection valve that intermittently injects fuel into a combustion chamber of an engine, and FIG. 2 shows an on-off valve mechanism of an electromagnetic valve that is a main part of the fuel injection valve.
The fuel injection valve 1 is used in a pressure accumulation (common rail) type fuel injection device for a diesel engine, and injects high pressure fuel supplied from a common rail (not shown) into a combustion chamber of the engine.
The fuel injection valve 1 includes an injection valve main body 2, an electromagnetic valve 3 attached to the rear end of the injection valve main body 2, and a fuel injection nozzle 4 fastened to the front end.
The solenoid valve 3 is provided with a connector C connected to a wire harness from an engine control unit (ECU) (not shown), and is controlled by a control signal sent from the ECU.

The injection valve main body 2 has a valve body 20 having a rod shape and provided with a cylinder 21 penetrating the shaft center and a high-pressure fuel flow path 22 and a low-pressure fuel flow path 23 provided in parallel with the cylinder 21.
A cylindrical electromagnetic valve installation chamber 10 is provided at the rear end of the valve body 20, and the electromagnetic valve 3 is mounted in the electromagnetic valve installation chamber 10 and fixed by a retaining nut 24. The injection nozzle 4 is coaxially fastened to the tip of the valve body 20 by a retaining nut 25. A cylindrical inlet portion 26 and an outlet portion 27 are provided on the upper portion of the valve body 20 so as to be inclined obliquely upward.

The electromagnetic valve 3 includes an electromagnetic solenoid 30 installed at the upper part of the electromagnetic valve installation chamber 10 and an on-off valve mechanism 50 installed at the lower part of the electromagnetic valve installation chamber 10. The on-off valve mechanism 50 includes a mover 5 and a mover holder 6 that holds the mover 5.
The lower part of the mover holder 6 (the lower end part of the electromagnetic valve installation chamber 10) is a slightly small-diameter plate chamber 70 in which a substantially disc-shaped throttle valve body 7 is accommodated.
The on-off valve operation of the on-off valve mechanism 50 and the pressure adjustment operation of the throttle valve body 7 are collectively referred to as pressure control means.

  In FIG. 2, an electromagnetic solenoid 30 is provided with a magnetic core 33 in which a composite magnetic material is laminated on the outer periphery of a cylinder 32 made of a ferromagnetic material and having a bowl-shaped upper end, and the outer periphery of the magnetic core 33 is formed of a ferromagnetic material outer cylinder. 34, and has a structure in which an electromagnetic coil 35 is disposed in the magnetic core 33. The lower surface of the electromagnetic solenoid 30 is a suction surface that sucks the mover 5, and the lower end surface of the cylinder 32 is a stopper surface on which the mover 5 collides (contacts).

  The mover 5 has a flat plate portion 51 and a shaft portion 52, and the flat plate portion 51 has a substantially flat upper surface and is a suction surface 5 E that is attracted to the lower surface of the electromagnetic solenoid 30. 60. The shaft portion 52 has a cylindrical shape and is slidably fitted into the center hole of the mover holder 6. The mover holder 6 is screwed into the inner periphery of the electromagnetic valve installation chamber 10 to generate a fastening axial force, and joins the throttle valve body 7 to the end surface of the plate chamber 70.

A valve body chamber 77 having a cylindrical portion and a conical portion is provided at the center of the lower end surface of the shaft portion 52, and a ball valve 78 made of silicon nitride is accommodated in the valve body chamber 77. The ball valve 78 has a spherical upper surface, but the lower surface has a sealing flat shape that closes the outflow restrictor 73 on the upper surface of the throttle valve body 7.
The mover 5 is urged downward (in the valve closing direction) by a spring 36 disposed in the cylinder 32, and is attracted upward (in the valve opening direction) by the magnetic force generated by the electromagnetic solenoid 30 and displaced up and down (FIG. 2). Dimension L).

  The electromagnetic valve installation chamber 10 in which the electromagnetic solenoid 30 and the on-off valve mechanism 50 are accommodated communicates with the outflow passage 13 connected to the low-pressure fuel passage 23 and is filled with low-pressure fuel oil. For this reason, the displacement of the mover 5 in the vertical direction mainly causes the resistance of the low-pressure fuel oil in the flat plate portion 51 and affects the responsiveness of the electromagnetic valve 3. In order to improve the responsiveness of the solenoid valve 3, it is necessary to reduce the resistance of the low pressure fuel oil of the flat plate portion 51 and reduce the weight of the mover 5 to enable a quick operation. The mover 5 is also an important component from the viewpoint of durability because an impact is applied with the vertical movement.

  As shown in FIG. 7, the flat plate portion 51 of the conventional mover 5 is provided with substantially V-shaped (fan-shaped) notches 53 at three positions on the outer periphery of the disk at regular intervals (120-degree intervals). . The notches 53 are formed to reduce resistance and reduce weight by the low-pressure fuel oil, and the shape and the number thereof are appropriately determined. A notch portion 54 is formed between the adjacent notches 53. Note that the shape of the notch may be other than a substantially V shape as long as the outer peripheral side is wide and the center side is narrow.

  In the center of the three notch portions 54, an oil passage hole 55 is provided that penetrates in the axial direction at equal intervals on a predetermined circumference. An outer peripheral slope 56 having a chamfer of about 45 degrees is provided on the lower surface of the outer periphery of the notch 54. The oil passage hole 55 communicates with the annular space 5C below the outer peripheral slope 56 at the outer peripheral portion of the lower surface, and the responsiveness of the displacement of the mover 5 is improved by reducing the resistance and reducing the weight by the low-pressure fuel oil. It is illustrated.

  A circular recess 57 is formed at the center of the suction surface (upper surface) 5E of the flat plate portion 51, and serves as a seat surface with which the lower end of the spring 36 abuts. On the outer periphery of the circular recess 57, an annular contact plane 5D slightly protruding upward is formed. The contact plane 5D has a size corresponding to the stopper surface (lower end surface) of the cylinder 32. From the circular recess 57, six oil passage grooves 58 in the radial direction are formed at equal intervals (60 degree intervals) from the outer periphery of the ring formed by the abutting flat surface 5D to the outside. The oil groove 58 communicates with the three notches 53.

  In addition, auxiliary grooves 59 in which the protruding portions of the annular contact flat surface 5 </ b> D are missing are alternately formed at intermediate positions of the six oil passage grooves 58. The auxiliary groove 59 is smaller than the oil passage groove 58, compensates for the shortage of fuel oil passing through the six oil passage grooves 58, and contributes to rapid fuel oil movement. The width, depth, number, and formation position of the auxiliary grooves 59 can be appropriately designed in a pattern extending from the outer periphery of the ring formed by the contact flat surface 5 </ b> D similarly to the oil passage groove 58.

  However, in the first embodiment of the present invention, as shown in FIG. 3, chamfering of about 45 degrees along the edge of the notch 53 is performed on the lower surface side of the flat plate portion 51 of the movable element 5. A slope is formed so as to reduce chamfering toward the inner part 5A, and this chamfer is provided on the same one side edge of all the notches 53, so that it is shaped like an impeller. Then, when the mover 5 moves up and down, the low-pressure fuel oil moves along this inclined surface, but because of the inclined surface, a horizontal acting force is generated as the fuel oil moves. This horizontal acting force rotates the mover 5.

  In addition, a slope is formed so as to reduce chamfering toward the innermost part 5A, but this is because the horizontal acting force acting on the outer peripheral part of the mover 5 is most effective for the rotational force of the mover 5. For this reason, the chamfer may be uniformly deeply formed toward the innermost part 5A. Further, the slope is provided with a chamfer of about 45 degrees along one side edge of the notch 53 on the lower surface side of the flat plate portion 51 of the movable element 5, and this is provided on one side of the notch 53 on the upper surface side of the flat plate portion 51. You may provide in an edge part, and you may provide in a direction (inclination) in which the needle | mover 5 rotates smoothly in the edge part of the notch 53 of upper and lower surfaces. Further, the shape of the chamfered slope is not limited to a straight shape, and may be convex or concave, and the chamfering slope is not limited to about 45 degrees, and may be larger or smaller than this. I do not care.

  In FIG. 2, the mover holder 6 is provided with a circular upper surface recess 62 on the upper surface and a lower surface recess 63 in the center of the lower surface. An annular plate 66 having a center hole having an upward taper and a notch 65 communicating with the annular space 5C is fitted into the upper surface recess 62. The mover holder 6 is formed with a vertical communication hole 67 communicating with the notch 53 and the annular space 5C. The communication hole 67 communicates with the lower surface recess 63 through the inclined hole 68.

  The throttle valve body 7 is a substantially circular disk in which a part of its circumferential end surface is cut out. A conical recess is formed at the center of the lower end surface of the throttle valve body 7 to form a pressure control chamber 40. An outflow restrictor 73 is formed on the upper surface side of the center. In addition, a communication hole 40 </ b> A inclined in the conical slope of the pressure control chamber 40 is opened, and communicates with the inlet flow path 12 of the inlet portion 26 via the inflow throttle 74.

In FIG. 1, a high-pressure fuel inflow passage 11 that communicates with the high-pressure fuel passage 22 and an inlet passage 12 that communicates the high-pressure fuel inflow passage 11 and the plate chamber 70 are formed inside the inlet portion 26. The fuel pressure of the high-pressure fuel supplied from the common rail is guided to the pressure control chamber 40 via the high-pressure fuel inflow passage 11, the inlet passage 12, and the inflow throttle 74.
The outlet portion 27 is provided with an outflow passage 13 communicating with the low-pressure fuel flow path 23 through the plate chamber 70, and discharges surplus fuel in the electromagnetic valve installation chamber 10 in the fuel injection valve 1 and the plate chamber 70 to the outside. A discharge channel is formed.

A cylinder 21 passes through the center of the valve body 20. The cylinder 21 houses a control piston 41. The control piston 41 is a cylindrical vertical piston. The upper end of the control piston 41 has a truncated cone shape and is disposed in a pressure control chamber 40 formed in the throttle valve body 7 with an appropriate gap (space). In accordance with the pressure in the pressure control chamber 40, the control piston 41 is pushed downward and slides in the cylinder 21 to move. On the other hand, the lower end of the control piston 41 is in contact with the upper end portion of the needle valve 42 accommodated in the injection nozzle 4.
A spring 44 is interposed at the lower end surface of the valve body 20 to urge the needle valve 42 downward (closed).

  The injection nozzle 4 has a two-stage cylindrical shape having a nozzle body 48 having a large diameter portion and a nozzle 49 having a small diameter portion. A retaining nut 25 is hung on the step portion and is fastened to the tip of the valve body 20. A needle hole 45 that accommodates the needle valve 42 is formed at the center of the nozzle body 48, and constitutes a needle sliding portion 45A that slides and supports the needle valve 42 and a needle fuel passage 45B that serves as a passage for high-pressure fuel oil. A bag hole portion 45C having a large volume and a large volume is provided at an intermediate position of the needle hole on the upstream side of the needle fuel passage 45B so as to intersect the inclined high pressure fuel passage 46.

  Further, a nozzle tip chamber 49A having an appropriately thin taper structure that closes the lower end of the needle hole 45 is formed on the downstream side of the needle fuel passage 45B, and one or a plurality of nozzle tip chambers 49A have an appropriate number. An injection hole 43 is provided at an appropriate position to spray high-pressure fuel.

  The needle valve 42 moves up and down by a balance between the downward biasing force due to the fuel pressure in the pressure control chamber 40 and the spring load of the spring 44 and the upward biasing force applied to the needle valve 42 by the fuel pressure in the injection nozzle 4. Then, the injection hole 43 is opened and closed. That is, when the pressure control chamber 40 becomes low pressure, the control piston 41 and the needle valve 42 move upward, the injection hole 43 is opened, and the high pressure fuel supplied from the high pressure fuel flow path 22 to the injection nozzle 4 is It is injected into the combustion chamber.

[Operation of Example 1]
The operation of the fuel injection valve 1 according to the first embodiment will be described with reference to FIGS.
When the fuel injection valve 1 is energized to the electromagnetic solenoid 30, the mover 5 is attracted by the electromagnetic force and moves upward, and the flat plate portion 51 collides with the lower surface (stopper surface) of the cylinder 32 and stops. At this time, since the low-pressure fuel oil moves along the slope of the edge of the V-shaped cutout 53 of the mover 5, the mover 5 receives the horizontal action force from the low-pressure fuel oil on this slope and rotates the stopper surface. The operation which collides with is shown. Then, the ball valve 78 is displaced upward in conjunction with the mover 5, and the outflow restrictor 73 is opened to communicate with the low pressure fuel outflow path 13, so that the pressure in the pressure control chamber 40 becomes an instantaneous low pressure, The pressure balance acting on the control piston 41 in the cylinder 21 is lost, the control piston 41 moves upward, and accordingly, the needle valve 42 in the needle hole 45 moves upward by the high pressure fuel pressure in the bag hole 45C. Then, the injection hole 43 is opened and the high-pressure fuel from the bag hole 45C is sprayed from the injection hole 43.

  When the energization of the electromagnetic solenoid 30 is turned off, the mover 5 moves downward by the urging force of the spring 36, the ball valve 78 closes the outflow throttle 73, and the high pressure fuel pressure is supplied from the inflow throttle 74 to the pressure control chamber 40. The control piston 41 moves downward, the needle valve 42 also moves downward, closes the injection hole 43, and the fuel injection ends.

[Effect of Example 1]
In the present embodiment, the mover 5 constituting the on-off valve mechanism 50 is displaced vertically while receiving the horizontal action force of the low-pressure fuel oil on the slope of the edge of the V-shaped notch 53, thereby causing a vertical displacement. Eliminates concentrated sliding and always realizes a new sliding surface and sliding to prevent local sliding failure. Further, the sticky substance generated in the mover chamber 60 is prevented from adhering to the oil passage groove, and the malfunction during valve closing is eliminated.

[Configuration of Example 2]
FIG. 4 shows a configuration diagram of the working surface of the mover 5 according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that chamfering of about 45 degrees along the edge of the V-shaped notch 53 is directed to the innermost portion 5 </ b> A on the lower surface side of the flat plate portion 51 of the mover 5. Rather than being formed with a slope so as to reduce chamfering, a large number of obliquely inclined slits 5S are arranged on the entire circumference at substantially equal intervals so as to penetrate the flat plate portion in the outer peripheral portion of the flat plate portion 51 of the mover 5. Has been established.

The low-pressure fuel oil moves along the inner surface of the slit 5S as the movable member 5 moves up and down. However, since the inner surface of the slit 5S is an inclined surface, the movable member 5 receives the horizontal acting force of the fuel oil. .
It should be noted that the inner surface of the obliquely inclined slit 5S is usually formed as a flat surface, and the width of the slit 5S, that is, the distance between the inner surfaces of the slit 5S is often constant. Even if the distance between the inner surfaces of the slits 5S is not constant, at least one of the inner surfaces of the slits 5S may be a predetermined slope (the rotation direction coincides).

[Effect of Example 2]
As the mover 5 moves up and down, the low-pressure fuel oil moves along the inner surface of the slit 5S. However, since the inner surface of the slit 5S is an inclined surface, the mover 5 receives the horizontal action force of the fuel oil and rotates. To do. Since a large number of inclined surfaces are formed on the outer peripheral portion, it has a feature of effectively converting the horizontal acting force of the fluid into rotation. Thereby, the movable element 5 is caused to slide up and down while rotating, thereby eliminating the concentrated sliding at one place, realizing a new sliding surface and sliding at all times, and preventing local sliding failure. In addition, the sticky substance generated in the mover chamber is prevented from adhering to the oil passage groove, thereby eliminating the malfunction when the valve is closed.

[Configuration of Example 3]
FIG. 5 shows a configuration diagram of the mover 5 in the third embodiment. The third embodiment is different from the first embodiment in that chamfering of about 45 degrees is directed to the innermost portion 5A along the side of the V-shaped notch on the lower surface side of the flat plate portion 51 of the mover 5. Rather than forming an inclined surface so as to reduce chamfering, an oil passage hole 55 penetrating in the axial direction at an equal interval on a predetermined circumference is formed in the approximate center of the notch portion 54 of the flat plate portion 51 of the mover 5. It is provided obliquely with respect to the flat plate portion 51. The oil passage hole 55 penetrating to the lower surface of the flat plate portion 51 intersects with the outer peripheral inclined surface 56 having a chamfer of about 45 degrees on the outer periphery on the lower surface, and enters the annular space 5C (see FIG. 2). It is configured to communicate.

  In the third embodiment, the oil passage hole 55 that is inclined and penetrated is provided in the center of each notch portion 54. However, the notch portion 54 is not limited to this. May be provided with a plurality of oil passage holes 55 which are inclined and penetrated. Further, the cross-sectional shape of the oil passage hole penetrating therethrough is not limited to a circular hole, and may be an ellipse, an ellipse, or a rectangular shape, and the inclined surface inclined obliquely has the upper and lower surfaces of the flat plate portion 51 as the start and end points. If it is the arrangement | positioning comprised by the circumferential direction, cross-sectional shape will not be limited to this.

[Effect of Example 3]
With this configuration, the low-pressure fuel oil moves along the inner surface of the penetrating oil passage hole 55 as the mover 5 moves up and down. However, the inner surface of the oil passage hole 55 has a slope inclined in the circumferential direction. The mover 5 receives the horizontal acting force of the fuel oil and rotates. Thereby, the movable element 5 is caused to slide up and down while rotating, thereby eliminating the concentrated sliding at one place, realizing a new sliding surface and sliding at all times, and preventing local sliding failure. In addition, the sticky substance generated in the mover chamber is prevented from adhering to the oil passage groove, thereby eliminating the malfunction when the valve is closed.

[Configuration of Example 4]
FIG. 6 shows a configuration diagram of the oil passage groove 58 of the suction surface 5E of the flat plate portion 51 of the mover 5 in the fourth embodiment. An annular contact plane 5D protruding slightly upward is formed on the outer periphery of the circular recess 57 provided at the center of the suction surface 5E of the flat plate portion 51 of the mover 5. The contact plane 5D has a size corresponding to the stopper surface (lower end surface) of the cylinder 32. From the circular recess 57, six oil passage grooves 58 are provided radially at equal intervals (60 degree intervals). In this fourth embodiment, the difference from the first embodiment is that the oil passage groove 58 is not provided straight in the radial direction (normal direction), but is provided in a curved curve shape such as a tangential direction or an arcuate shape, Further, it is characterized in that the oil passage grooves 58 are arranged uniformly over the entire circumference. As a result, the low-pressure fuel oil that flows out or flows in from the circular recess 57 moves along the oil passage groove 58 as the movable element 5 moves up and down, but the oil passage groove 58 is inclined (curved). Since it is configured, the movement of the fuel oil is accompanied by a direction change and generates a rotational force.

  In the fourth embodiment, the oil passage groove 58 is not arranged straight in the radial direction, but the curved flow path is arranged substantially radially and flows out and flows into the outer peripheral portion, but the fuel oil moves. Since the structure is characterized by sometimes changing the moving direction, it is not limited to the tangential direction described above or a curved shape like a bow. It does not matter if it is configured as follows, is bent in multiple stages, is an arc, or is not uniformly curved.

  Auxiliary grooves 59 in which the protruding portions of the annular contact plane 5D are missing are formed alternately in the middle positions of the six oil passage grooves 58, smaller than the oil passage grooves 58. The auxiliary grooves 59 are substantially the same pattern as the oil passage grooves 58 and are inclined (curved) in the same direction as the oil passage grooves 58, and there is insufficient fuel oil passing through the six oil passage grooves 58. It contributes to the rapid movement of fuel oil. As the mover 5 moves up and down, the low-pressure fuel oil moves along the auxiliary groove 59 and moves while changing the direction according to the pattern.

[Effect of Example 4]
With this configuration, the low-pressure fuel oil that flows out or flows in from the circular recess 57 moves along the oil passage groove 58 as the movable element 5 moves up and down, but the oil passage groove 58 is inclined (curved). Therefore, the movement of the fuel oil is accompanied by a change of direction, and the mover 5 receives a horizontal acting force from the fuel oil and rotates. Similarly, the auxiliary groove 59 receives the horizontal acting force of the fuel oil and generates a rotational force. Thereby, the movable element 5 is caused to slide up and down while rotating, thereby eliminating the concentrated sliding at one place, realizing a new sliding surface and sliding at all times, and preventing local sliding failure. In addition, the sticky substance generated in the mover chamber is prevented from adhering to the oil passage groove, thereby eliminating the malfunction when the valve is closed.

(Example 1) which is sectional drawing of a fuel injection valve. FIG. 2 is a cross-sectional view of a main part of FIG. 1 (Example 1). (A) is a top view of a needle | mover, (b) is the same front view, (c) is the same bottom view (Example 1). (A) is a top view of a needle | mover, (b) is the front view, (c) is the bottom view (Example 2). (A) is a top view of a needle | mover, (b) is the front view, (c) is the bottom view (Example 3). (Example 4) which is a top view of a needle | mover. It is a perspective view of a needle | mover (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Injection valve main body 20 Valve body 3 Electromagnetic valve 30 Electromagnetic solenoid 36 Spring (biasing means)
4 injection nozzle 40 pressure control chamber 5 mover (armature)
5A innermost part 5C of notch annular space 5E adsorption surface 5S slit 50 on-off valve mechanism 51 flat plate part 52 shaft part 53 notch 54 notch part 55 oil passage hole 56 outer peripheral slope 58 oil passage groove 59 auxiliary groove 6 mover Holder (armature holder)
60 Movable child room (armature room)
7 Throttle valve body 73 Outflow throttle 74 Inflow throttle

Claims (5)

It consists of an injection valve body and an electromagnetic valve that intermittently injects fuel from the injection valve body,
The electromagnetic valve includes an electromagnetic solenoid and an on-off valve mechanism,
The on-off valve mechanism includes a mover that is disposed in the electromagnetic valve filled with low-pressure fuel oil and that is driven by the biasing means and the magnetic force of the electromagnetic solenoid,
In the fuel injection valve, the mover has a suction surface that is separated from and in contact with the electromagnetic solenoid.
A fuel injection valve characterized in that the movable element is provided with a working surface that generates a biasing force in the rotational direction by the movement of the low-pressure fuel oil accompanying the displacement of the movable element in the axial direction.   2. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms the adsorption surface, and a plurality of notches are formed in an outer peripheral portion of the flat plate portion, The fuel injection valve according to claim 1, wherein the surface is constituted by a slope formed at an edge of the notch.   3. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms the adsorption surface, and a plurality of inclined slits are formed on an outer peripheral portion of the flat plate portion. The fuel injection valve is characterized in that the working surface is constituted by an inclined surface of the slit.   3. The fuel injection valve according to claim 1, wherein the mover includes a flat plate portion that forms the adsorption surface, and a notch portion between the cutouts of the flat plate portion. A fuel injection valve characterized in that an oil passage hole arranged on a predetermined circumference is formed to be inclined with respect to the axial direction, and the working surface is constituted by a slope of the oil passage hole.   3. The fuel injection valve according to claim 1, wherein the movable element includes a flat plate portion that forms the adsorption surface, and a central portion and an outer peripheral portion of the adsorption surface communicate with the adsorption surface. A fuel injection valve, wherein an oil passage groove is provided, and the working surface is formed by a curved surface formed by radially bending the oil passage groove.

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