JP5258648B2 - Fuel injection valve - Google Patents

Description

  The present invention relates to a fuel injection valve that injects fuel.

  Conventionally, various fuel injection valves have been proposed. Patent Document 1 discloses a fuel injection valve as an example.

  The fuel injection valve disclosed in Patent Document 1 includes a valve seat, a valve body that can be attached to and detached from the valve seat, a drive unit that drives the valve body, and a nozzle plate that injects fuel. . In the nozzle plate, a plurality of injection holes are respectively formed on a double virtual circle. In this fuel injection valve, when the valve body is opened by being driven by the drive unit, the fuel that has passed between the valve body and the valve seat is injected from the injection hole of the nozzle plate.

JP 2000-145590 A

  In such a fuel injection valve, in order to increase the combustion efficiency of the engine, it is preferable that the particle size of the fuel to be injected is small. In order to atomize the fuel, it is preferable that the flow rate of the fuel introduced into the injection hole is high. good.

  However, in the fuel injection valve of Patent Document 1, since the injection holes are widely distributed in the nozzle plate, the fuel that has passed between the valve seat and the valve body convects on the nozzle plate and the flow velocity is increased. There is a problem that the phenomenon of flowing into the injection hole in a state where it is greatly lowered occurs, and fuel atomization is not favorably promoted in the injection hole.

  Therefore, an object of the present invention is to provide a fuel injection valve that can favorably promote atomization of fuel in each of a plurality of injection holes.

In the fuel injection valve according to the present invention, a plurality of injection holes are provided as first injection holes on a virtual circle inside two virtual circles having different diameters centering on the axial center line of the valve seat of the nozzle plate. A plurality of second injection holes are provided on the virtual circle outside the two virtual circles, and the first injection holes and the second injection holes are provided alternately in the circumferential direction, and between the valve seat and the valve body a first hole corresponding guiding surfaces for guiding toward the fuel passing through the first injection hole, the fuel a second hole corresponding guiding surfaces for guiding toward the second injection hole that has passed between said valve body and the valve seat with the door, each hole corresponding guide surface or Rano nozzle plate virtual extension plane obtained by extending to, characterized in that the inlet of the injection Iana that corresponds to each hole corresponding guide surfaces are located.

According to the present invention, holes corresponding guide surfaces are provided for each injection holes, on a virtual extended plane from each hole corresponding guide surfaces to respective injection holes corresponding to the holes corresponding guide surfaces, each hole corresponding guide by the entrance of the respective injection holes corresponding to the surface is located, it is possible to substantially make straight directed to each injection hole fuel passing between the valve seat and the valve body by the holes corresponding guide surfaces, The fuel can be introduced into each injection hole while suppressing a decrease in the flow rate of the fuel. Therefore, atomization of fuel can be favorably promoted in each of the plurality of injection holes.

It is sectional drawing which shows the fuel injection valve concerning the 1st Embodiment of this invention with an internal combustion engine. It is sectional drawing (sectional drawing along an axial direction) which shows the fuel injection valve concerning the 1st Embodiment of this invention. It is sectional drawing (sectional drawing along an axial direction) which shows a part of front-end | tip part of the fuel injection valve concerning the 1st Embodiment of this invention. It is another sectional view (sectional view along an axial direction) which shows a part of tip part of a fuel injection valve concerning a 1st embodiment of the present invention. It is a top view which shows the valve seat member and nozzle plate concerning the 1st Embodiment of this invention. The nozzle plate concerning the 1st Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing along the VI-VI line of (a). It is an enlarged view of the VII part of FIG. It is an enlarged view of the VIII part of FIG. It is sectional drawing (sectional drawing along an axial direction) which shows a part of front-end | tip part of the fuel injection valve concerning the 2nd Embodiment of this invention. It is another sectional view (sectional view along an axial direction) which shows a part of tip part of a fuel injection valve concerning a 2nd embodiment of the present invention. It is a top view which shows the valve seat member and nozzle plate concerning the 2nd Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. This embodiment is an application example to a fuel injection valve used in an internal combustion engine mounted on a vehicle such as a four-wheeled vehicle or a two-wheeled vehicle. In the following description, for the sake of convenience, the end of the fuel injector that injects fuel is the tip of the fuel injector, and the end of the fuel injector that is supplied with fuel from the fuel pipe is the fuel injector. This will be referred to as the base end portion (the base end portion in the axial direction). In the description, the term “axial direction” refers to the axial direction of the fuel injection valve.

  As shown in FIG. 1, the fuel injection valve 1 has a base end connected to the fuel pipe 103 via a connection pipe 101, and a tip end inserted into the insertion port 105 a of the internal combustion engine 105. The insertion port 105 a is formed in the intake pipe 105 b of the internal combustion engine 105. The fuel injected from the fuel injection valve 1 is supplied into the cylinder 105e of the engine block 105d opened by opening the intake valve 105c.

  As shown in FIG. 2, the fuel injection valve 1 includes a substantially cylindrical metal cylinder 5 having a flow path 3 formed therein, and a flow path 3 provided inside the tip of the cylinder 5. The valve part 7 which opens and closes and the drive part 9 which drives this valve part 7 are provided.

  The cylindrical body 5 is formed as a relatively thin metal pipe having a step, for example, by subjecting a metal material such as magnetic stainless steel to press working such as deep drawing. The cylindrical body 5 is formed with a large diameter portion 5a on the base end side and a small diameter portion 5b having a smaller diameter than the large diameter portion 5a on the distal end side. The proximal end portion of the cylindrical body 5 is inserted into the connecting pipe 101, and the outer peripheral surface of the proximal end portion of the cylindrical body 5 closes the gap between the cylindrical body 5 and the connecting pipe 101, and is liquid-tight and airtight between them. An O-ring 11 that secures the above is extrapolated. The cylinder 5 is supplied with fuel that is pumped from a fuel pump (not shown) and flows through the fuel pipe 103 via the connection pipe 101, and the supplied fuel flows along the flow path 3. The cylinder 5 flows from the proximal end portion toward the distal end portion.

  A fuel filter 13 for filtering fuel is attached to the base end portion of the cylindrical body 5. The fuel filter 13 includes a cylindrical metal core 13a press-fitted into the large-diameter portion 5a of the cylinder 5, and a metal core 13a using a resin material softer than the cylinder 5, such as nylon or fluororesin. An integrally formed frame 13b and a mesh-like filter body 13c attached to the frame 13b and filtering fuel are provided.

  As shown in FIGS. 2 and 3, the valve portion 7 is disposed inside the distal end portion of the tubular body 5 and is made of a metal valve seat member 15 fixed to the tubular body 5, and disposed inside the tubular body 5. The metal valve body 17 is provided.

  The valve seat member 15 has a cylindrical shape with a flow passage hole 15a through which fuel flows. The flow path hole 15 a constitutes a part of the flow path 3. A valve body 17 is accommodated in the flow path hole 15a so as to be movable in the axial direction. An annular valve seat 15c is formed on the peripheral surface 15b of the flow path hole 15a. The diameter of the channel hole 15a is formed to be small in a step shape from the base end to the tip, and a valve seat 15c is formed on an inclined surface 15d which is one of the step surfaces. The valve seat member 15 is fixed to the cylindrical body 5 by all-around laser welding from the outside of the cylindrical body 5. This weld location is indicated by reference numeral 19 in FIG.

  A nozzle plate 21 is disposed on the downstream side of the valve seat member 15. The nozzle plate 21 is fixed to the tip (downstream end) of the valve seat member 15 and closes the flow path hole 15a. As shown in FIGS. 3 and 4, the nozzle plate 21 is formed with a plurality of injection holes 21 c and 21 d, and these injection holes 21 c and 21 d open into the intake pipe 105 b of the internal combustion engine 105. The fuel that has passed between the valve seat 15c and the valve body 17 is injected. The nozzle plate 21 is formed of, for example, a metal such as stainless steel, and is fixed to the valve seat member 15 by annular laser welding surrounding the injection holes 21c and 21d. This welding location is indicated by reference numeral 23 in FIG.

  As shown in FIGS. 2 and 3, the valve body 17 is formed in a spherical shape and can be attached to and detached from the valve seat 15 c. The valve body 17 is axially arranged between a seating position (not shown) seated on the valve seat 15c by a driving force of the drive unit 9 and a valve opening position (position shown in FIG. 3) separated from the valve seat 15c. It is driven back and forth.

  The drive unit 9 is an electromagnetic actuator, and specifically drives the valve body 17 in the valve unit 7. As shown in FIG. 2, the drive unit 9 is disposed inside the cylinder 5 and fixed to the cylinder 5 (core cylinder) 25, and inside the cylinder 5 on the distal end side of the fixed core 25. A movable iron core (anchor) 27 that is arranged and movable in the axial direction, an electromagnetic coil 29 extrapolated to the cylindrical body 5 at a position outside the fixed iron core 25 and the movable iron core 27, and an inner peripheral side of the electromagnetic coil 29 A bobbin 31 arranged and a yoke 33 arranged on the outer peripheral side of the electromagnetic coil 29 are provided. The fixed iron core 25, the movable iron core 27, the electromagnetic coil, and the yoke 33 form a closed magnetic path.

  The fixed iron core 25 is formed in a cylindrical shape extending in the axial direction by a magnetic metal material. The fixed iron core 25 is press-fitted into the small-diameter portion 5b of the cylindrical body 5. The front end surface of the fixed iron core 25 has a relatively small gap δ in the base end surface of the movable iron core 27 when the fuel injection valve 1 is closed. Face each other. An adjuster cylinder 35 extending in the axial direction is fitted into the fixed iron core 25, and the fuel that has flowed into the fixed iron core 25 flows out of the fixed iron core 25 via the inside of the adjuster cylinder 35. It has become. That is, the fixed iron core 25 and the adjuster cylinder 35 form a part of the flow path 3.

  The movable iron core 27 is formed in a stepped cylindrical shape extending in the axial direction by a magnetic metal material, and has a large-diameter portion 27a facing the fixed iron core 25 and a large-diameter portion 27a having a smaller diameter than the large-diameter portion 27a. A small-diameter portion 27b that protrudes from the end portion of the fuel injection valve 1 toward the tip end side of the fuel injection valve 1. The valve body 17 is fixed to the front end portion of the movable iron core 27 by welding. With this structure, the valve body 17 moves integrally with the movable iron core 27. A concave portion 27c that opens toward the fixed iron core 25 is formed in the large diameter portion 27a of the movable iron core 27, and an opening portion 27d that communicates with the concave portion 27c is formed in the side surface in the small diameter portion 27b. A back pressure chamber 37 is formed between the outer peripheral surface of the small diameter portion 27 b of the movable iron core 27 and the inner peripheral surface of the cylindrical body 5. In the movable iron core 27 having such a structure, the fuel that has flowed into the recess 27c from the fixed iron core 25 flows out from the opening 27d into the back pressure chamber 37. That is, the movable iron core 27 forms a part of the flow path 3.

  Between the movable iron core 27 and the fixed iron core 25, a coil spring 39 as an urging member constituting the drive unit 9 is interposed in a compressed state. The coil spring 39 is inserted into the recess 27c of the movable core 27, and one end (base end) thereof is in contact with the tip end surface of the adjuster cylinder 35, while the other end (tip end) is the recess 27c. It is in contact with the bottom surface. The coil spring 39 urges the movable iron core 27 and the valve body 17 in the valve closing direction of the valve body 17 and seats the valve body 17 on the valve seat 15c.

  The yoke 33 is formed in a stepped cylindrical shape, and has a large-diameter portion 33a that covers the outer periphery of the electromagnetic coil 29 and a smaller diameter than the large-diameter portion 33a, and the fuel injection valve 1 from the end of the large-diameter portion 33a. A small-diameter portion 33b that protrudes toward the distal end side. The yoke 33 has a small diameter portion 33b pressed into the small diameter portion 5b of the cylindrical body 5 and is fixed thereto.

  The bobbin 31 is formed in a cylindrical shape by a resin material and is extrapolated to the cylindrical body 5. The electromagnetic coil 29 is externally inserted into the cylindrical body with the electromagnetic coil 29 wound around the bobbin 31. Electric power is supplied to the electromagnetic coil 29 from an external power source (not shown) via a pin 43 provided on the connector 41 and a conductive path 45.

  In the drive unit 9 having such a configuration, when the electromagnetic coil 29 is not energized, the state in which the valve body 17 is seated on the valve seat 15c is maintained by the urging force of the coil spring 39 (valve closed state). In this case, a gap δ is formed between the fixed iron core 25 and the movable iron core 27 in the axial direction. On the other hand, when the electromagnetic coil 29 is energized, a closed magnetic path is formed by the electromagnetic coil 29, the fixed iron core 25, the movable iron core 27, and the yoke 33, whereby a magnetic force in the direction toward the fixed iron core 25 acts on the movable iron core 27. . Due to this magnetic force, the movable iron core 27 is attracted to the fixed iron core 25 against the urging force of the coil spring 39, and the valve seat member 15 that moves together with the movable iron core 27 separates from the valve seat 15c (valve open state). ).

  An O-ring 46 is externally inserted into the small-diameter portion 33 b of the yoke 33 of the drive unit 9, and this O-ring 46 is formed between the inner peripheral surface of the insertion port 105 a of the internal combustion engine 105 and the outer peripheral surface of the yoke 33. Close the gap to ensure liquid and air tightness between them.

  Further, the fuel injection valve 1 includes a cover 47 that covers an intermediate portion of the cylinder 5 and a protector 49 that covers the tip of the cylinder 5. The cover 47 is made of, for example, resin, and is formed by injection molding in a state where the yoke 33, the electromagnetic coil 29, and the like are assembled on the outer peripheral side of the cylindrical body 5. The cover 47 is integrally formed with the connector 41, and a conductive path 45 is formed in the cover 47. The protector 49 is formed in a cylindrical shape and is sheathed at the distal end portion of the cylindrical body 5 to protect the distal end portion of the cylindrical body 5.

  In the fuel injection valve 1 having such a configuration, when the electromagnetic coil 29 is energized and the valve body 17 is separated and opened, the fuel supplied into the cylinder 5 flows down the flow path 3. That is, after being filtered by the fuel filter 13, the fuel flows into the back pressure chamber 37 via the fixed iron core 25 and the movable iron core 27, and from the back pressure chamber 37 when the valve body 17 and the valve seat member 15 are opened. It passes through the gap formed between the valve seat 15c and is injected from the injection holes 21c and 21d of the nozzle plate 21 (see FIGS. 3 and 4). Here, the arrows in FIGS. 3 and 4 schematically show the flow directions of the fuel injected from the injection holes 21c and 21d, taking the right injection holes 21c and 21d as examples.

  Next, the nozzle plate 21 and the valve seat member 15 constituting the fuel atomization promoting structure in the fuel injection valve 1 will be described in detail with reference to FIGS. Here, FIG. 3 shows a nozzle plate having a cross section taken along line III-III in FIG. 5, while FIG. 4 shows a nozzle plate having a cross section taken along line IV-IV in FIG. 5.

  As shown in FIGS. 3 and 6, the nozzle plate 21 is formed in a disc shape. The nozzle plate 21 is formed with an annular flat plate portion 21a and a bulging portion 21b that is located at the center of the nozzle plate 21 and is connected to the inner periphery of the flat plate portion 21a. The bulging portion 21b is curved and bulged in a spherical shape toward the side opposite to the valve body 17 side. A plurality of injection holes 21c and 21d are formed in the bulging portion 21b.

  The injection holes 21c and 21d are located inside the valve seat 15c in plan view. A plurality of injection holes 21c and 21d are respectively formed on two virtual circles b and c having different diameters around the axial center line d of the valve seat 15c. Out of the two virtual circles b and c, the outer virtual circle b has four injection holes 21c arranged at equal intervals in the circumferential direction, and the inner virtual circle c of the two virtual circles b and c The four injection holes 21d are arranged at equal intervals in the circumferential direction. Accordingly, the four injection holes 21c arranged in the outer virtual circle b have the same distance from the axial center line d in the direction orthogonal to the axial center line d of the valve seat 15c, and the inner virtual circle c. The four injection holes 21d arranged at the same distance from the axial center line d in the direction orthogonal to the axial center line d of the valve seat 15c are mutually the same. Here, if one of the injection holes 21d arranged in the inner virtual circle c is a reference injection hole 21d, this reference injection hole 21d and four injection holes arranged in the outer virtual circle b are used. The distance from the axial center line d in a direction orthogonal to the axial center line d of the valve seat 15c is different from 21c. In other words, the plurality of injection holes 21c and 21d includes an injection hole 21c whose distance from the axis center line d in a direction orthogonal to the axis center line d of the valve seat 15c is different from the reference injection hole 21d. It is.

  Further, the injection hole 21c arranged in the outer virtual circle b and the injection hole 21d arranged in the inner virtual circle c of the two virtual circles b and c alternate around the axis d of the valve seat 15c. The pitch angles between the adjacent injection holes 21c and 21d around the axial center line d of the valve seat 15c are all the same, and are 45 degrees in this embodiment.

  The injection holes 21c and 21d are inclined with respect to the axial center line d of the valve seat 15c so as to move away from the axial center line d of the valve seat 15c as it goes from the upstream portion to the downstream portion of the injection holes 21c and 21d. ing. That is, the axial center line e of the injection holes 21c and 21d (the axial center line of the injection hole 21c is not shown) and the axial line d of the valve seat 15c intersect at an acute angle. With this structure, the fuel injected from the plurality of injection holes 21c and 21d is prevented from interfering with each other immediately after the injection.

  As shown in FIGS. 3 and 4, the flow passage hole 15a of the valve seat member 15 has an inclined surface 15d, an outlet surface 15e extending downstream from the downstream end of the inclined surface 15d, and an inclined surface 15d. A plurality of recesses 15f located at the downstream end are formed.

  The inclined surface 15d is formed in an annular shape that includes the valve seat 15c and decreases in diameter as it goes downstream, and approaches the axial center line d of the valve seat 15c as it goes downstream. The outlet surface 15e is formed in parallel with the axial center line d of the valve seat 15c, and the downstream end of the outlet surface 15e is connected to the nozzle plate 21.

  As shown in FIGS. 3 and 5, the recess 15 f is provided corresponding to each injection hole 21 c arranged in the virtual circle b on the outer peripheral side, and in this embodiment, four recesses 15 f are provided. Each recessed part 15f is located on the same straight line orthogonal to the axial center line d of the corresponding injection hole 21c and the valve seat 15c by planar view.

  Further, on the peripheral surface 15b of the flow path hole 15a, as shown in FIGS. 3 to 5, a hole corresponding guide surface that guides the fuel that has passed between the valve seat 15c and the valve body 17 toward the nozzle plate 21. 15g and 15h are provided for each of the injection holes 21c and 21d. The hole corresponding guide surfaces 15g and 15h are provided in the flow path 3 downstream of the valve seat 15c.

  A hole corresponding guide surface 15g corresponding to the injection hole 21c located in the outer virtual circle b is formed in the recess 15f. On the other hand, the hole corresponding guide surface 15h corresponding to the injection hole 21d located in the inner virtual circle c is formed on the inclined surface 15d between the recesses 15f. Specifically, an intermediate portion between the recesses 15f that is a part of the inclined surface 15d between the recesses 15f is a hole-corresponding guide surface 15h. Therefore, four sets 51 of the injection hole 21c and the hole corresponding guide surface 15g located in the outer virtual circle b are configured, and the injection hole 21d and the hole corresponding guide surface 15h located in the inner virtual circle c are formed. Four sets 52 are also formed. Then, as shown in FIGS. 7 and 8, the corresponding holes are provided on the virtual extension surfaces f and g from the corresponding hole guide surfaces 15g and 15h to the injection holes 21c and 21d corresponding to the corresponding hole guide surfaces 15g and 15h. The inlets 21j and 21k and the peripheral surfaces 21h and 21i of the injection holes 21c and 21d corresponding to the guide surfaces 15g and 15h are located.

  In the fuel injection valve 1 having such a configuration, as shown in FIGS. 3 and 4, the fuel that has passed between the valve seat 15c and the valve body 17 is guided by the hole corresponding guide surfaces 15g and 15h to be injected into the injection hole. It flows into 21c and 21d and is injected from the injection holes 21c and 21d. At this time, because the inlets 21j and 21k of the injection holes 21c and 21d are positioned on the virtual extension surfaces f and g to the injection holes 21c and 21d in the hole corresponding guide surfaces 15g and 15h, the valve seat 15c and the valve body Since the fuel that has passed between the two nozzles 17 can be directed substantially straight to the injection holes 21c and 21d by the hole corresponding guide surfaces 15g and 15h, the fuel is injected into the injection holes 21c and 21d while suppressing a decrease in the flow rate of the fuel. Can be introduced. Therefore, atomization of fuel can be favorably promoted in each of the plurality of injection holes 21c and 21d.

  Moreover, in this embodiment, since the inlets 21j and 21k of the injection holes 21c and 21d are located on the virtual extension surfaces f and g to the injection holes 21c and 21d in the hole corresponding guide surfaces 15g and 15h, the hole correspondence guide is provided. The fuel guided by the surfaces 15g and 15h strongly collides with the peripheral surfaces 21h and 21i of the injection holes 21c and 21d, spreads on the peripheral surfaces 21h and 21i, and flows down the injection holes 21c and 21d while forming a fuel film. . Thereby, since the contact area of the fuel and air in the injection holes 21c and 21d increases, mixing of fuel and air can be promoted. Therefore, atomization of the injected fuel can be promoted better.

  In the present embodiment, the nozzle plate 21 is fixed to the valve seat member 15. The valve seat member 15 is provided with a flow passage hole 15a through which fuel flows, and the peripheral surface 15b of the flow passage hole 15a. The hole-corresponding guide surfaces 15g and 15h are formed. Therefore, for example, the injection holes 21c and 21d of the nozzle plate 21 and the hole-corresponding guide surfaces 15g and 15h can be aligned better than when the hole-corresponding guide surfaces 15g and 15h are provided in the valve body.

  In the present embodiment, a plurality of injection holes 21c and 21d are respectively formed on two virtual circles b and c having different diameters around the axial center line d of the valve seat 15c. , C, the injection holes 21c arranged in the outer virtual circle b and the injection holes 21d arranged in the inner virtual circle c are alternately positioned around the axis d of the valve seat 15c. Therefore, the fuel injected from the injection holes 21c and 21d can be prevented from interfering immediately after the injection, and the atomization of the fuel can be favorably promoted even after the injection from the injection holes 21c and 21d.

  In the present embodiment, the flow passage hole 15a includes an annular inclined surface 15d that includes the valve seat 15c and decreases in diameter toward the downstream, and is positioned at the downstream end of the inclined surface 15d and the circumferential direction of the inclined surface 15d. And a plurality of recesses 15f that are spaced from each other. And the hole corresponding | compatible guide surface 15g corresponding to the injection hole 21c located in the outer virtual circle b is formed in the recessed part 15f, and it respond | corresponds to the injection hole 21d located in the inner virtual circle c between the recessed parts 15f of the inclined surface 15d. A hole corresponding guide surface 15h is formed. Therefore, the hole corresponding guide surfaces 15g and 15h can be realized with a relatively simple structure.

  Next, a second embodiment of the present invention will be described in detail with reference to FIGS. In addition, the same code | symbol is provided to the same part as 1st Embodiment, and the overlapping description is abbreviate | omitted. Here, FIG. 9 shows a nozzle plate having a cross section taken along line IX-IX in FIG. 11, while FIG. 10 shows a nozzle plate having a cross section taken along line XX in FIG.

  The present embodiment is different from the first embodiment in the arrangement of the injection holes. In the present embodiment, nozzle holes 21m and 21n are also formed in the nozzle plate 21 at positions away from the virtual circles b and c. In the present embodiment, three injection holes 21c and 21d are formed on the virtual circles b and c, respectively.

  Moreover, the recessed part 15f corresponding to these injection holes 21m and 21n is formed in the valve seat member 15, and the hole corresponding | compatible guide surfaces 15p and 15q corresponding to the injection holes 21m and 21n are formed in these recessed parts 15f. Yes. And the injection hole corresponding to the said hole corresponding | compatible guide surface 15p, 15q on the virtual extension surface h, i from the hole corresponding guide surface 15p, 15q to the injection hole 21m, 21n corresponding to the said hole corresponding guide surface 15p, 15q. The entrances and peripheral surfaces of 21m and 21n are located. Here, the inclination angles of the hole corresponding guide surfaces 15g, 15h, 15p, and 15q are determined according to the corresponding injection holes 21c, 21d, 21m, and 21n, and these hole corresponding guide surfaces 15g, 15h, 15p, The inclination angles of 15q are different from each other.

  According to the fuel injection valve 1 of the present embodiment having such a configuration, as with the fuel injection valve 1 of the first embodiment, the fuel that has passed between the valve seat 15c and the valve body 17 is passed through the hole corresponding guide surface. Since 15 g, 15 h, 15 p, and 15 q can direct the injection holes 21 c, 21 d, 21 m, and 21 n substantially straight, the fuel is supplied to the injection holes 21 c, 21 d, 21 m, and 21 n while suppressing the fuel flow rate from decreasing. Can be introduced. Therefore, fuel atomization can be favorably promoted in each of the plurality of injection holes 21c, 21d, 21m, and 21n.

  The present invention is not limited to the above embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. For example, you may provide a hole corresponding | compatible guide surface in a valve body. Further, the plurality of injection holes may not be arranged on the virtual circle.

  Technical ideas other than the claims that can be grasped from the above embodiment will be described below.

  A plurality of injection holes are respectively formed on two virtual circles having different diameters centered on the axial center line of the valve seat, and the injection hole arranged on the outer virtual circle of the two virtual circles and the inner virtual hole The injection holes arranged in a circle are alternately positioned around the axial center line of the valve seat, and the flow path hole includes an annular inclined surface that includes the valve seat and decreases in diameter toward the downstream, and this inclination It is preferable that a plurality of recesses positioned at the downstream end of the surface and spaced apart from each other in the circumferential direction of the inclined surface are formed, and the injection holes positioned in the outer virtual circle are formed in the recesses It is preferable that a hole-corresponding guide surface corresponding to is formed, and a hole-corresponding guide surface corresponding to the injection hole located in the inner virtual circle is formed between the concave portions of the inclined surface.

DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve 9 ... Drive part 15 ... Valve seat member 15a ... Flow path hole 15c ... Valve seat 15d ... Inclined surface 15f ... Recessed part 15g, 15h, 15p, 15q ... Hole corresponding guide surface 17 ... Valve body 21 ... Nozzle plate 21c, 21d, 21m, 21n ... injection hole 21h, 21i ... peripheral surface of injection hole 21j, 21k ... inlet of injection hole b, c ... virtual circle d ... axial center line of valve seat f, g, h, i ... virtual Extended surface

Claims (3)

The disc,
A valve seat member formed with an annular valve seat;
A drive section for separating and seating the valve body on the valve seat;
Disposed downstream of the valve seat member, a fuel injection valve having a nozzle plate having a plurality of injection holes for injecting fuel,
The plurality of injection holes are provided as a plurality of first injection holes on a virtual circle inside two virtual circles having different diameters around the axial center line of the valve seat of the nozzle plate, and the two virtual holes A plurality of second injection holes are provided on a virtual circle outside the circle,
The first injection holes and the second injection holes are alternately provided in the circumferential direction,
A first hole corresponding guide surface that guides the fuel that has passed between the valve seat and the valve body toward the first injection hole , and the fuel that has passed between the valve seat and the valve body. A second hole corresponding guide surface that guides toward the two injection holes ,
The inlet of the injection hole corresponding to each hole-corresponding guide surface is located on a virtual extension surface extended from each hole-corresponding guide surface to the nozzle plate ,
The fuel injection valve characterized by the above-mentioned. The fuel injection valve according to claim 1, wherein
The peripheral surface of each injection hole corresponding to each hole-corresponding guide surface is located on a virtual extension surface extended from each hole-corresponding guide surface to the nozzle plate ,
Fuel injection valve you, characterized in that. The fuel injection valve according to claim 1 or 2,
The nozzle plate is fixed to the valve seat member,
The valve seat member is formed with a passage hole through which fuel flows,
Each hole corresponding guide surface is formed on the peripheral surface of the flow path hole ,
Fuel injection valve you, characterized in that.

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