JP5253480B2 - Fuel injection valve - Google Patents

Description

  The present invention relates to a fuel injection valve used as a fuel injection valve for an engine.

  As this type of technology, the technology described in Patent Document 1 below is disclosed. In this publication, there is disclosed one in which a turning groove is formed in the valve body and a turning flow is generated in the cavity body. A swirl chamber protruding in the radial direction is formed in the cavity body.

JP 2009-197682 A

In the technique described in Patent Document 1, since there is no wall between adjacent swirl chambers, fuel cannot be efficiently guided from the cavity (central chamber) into the swirl chamber, and the fuel flow rate may be reduced. there were.
The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to efficiently guide the fuel from the central chamber to the swirl chamber, to suppress a decrease in the flow rate of the fuel, and to atomize the fuel. It is to provide a fuel injection valve that can.

In order to achieve the above object, in the first invention, a valve seat on which the valve body sits when the valve is closed is formed, and a valve seat member having an opening on the downstream side is communicated with the opening of the valve seat member. A central chamber having a cylindrical inner surface, a swirl groove formed on the outer periphery of the valve body in an oblique direction with respect to the axial direction, and for swirling fuel in the central chamber; and downstream of the central chamber A plurality of swirl application chambers that are formed and have a cylindrical inner side surface and apply a swirling force by swirling fuel inside, and are connected to the swirl application chambers in a tangential direction of the respective swirl application chambers , Connected to the central chamber toward the tangential direction of the central chamber, a communication passage for supplying fuel from the central chamber to the swirl application chamber, and a cylindrical shape formed at the bottom of the swirl application chamber and penetrating to the outside And a fuel injection valve having an injection hole A guide wall for guiding fuel in the communication path is formed between the adjacent communication paths connected to the central chamber, and the communication path is formed on a side surface of the communication path and in the swirl chamber. An extension line of a side surface connected to the inside in the radial direction is in contact with the injection hole or radially outside the injection hole, and a side wall radially outside the central chamber of the communication path is in contact with the central chamber. It was made to form on a line .
In the second invention, a valve seat on which the valve body sits when the valve is closed is formed, a valve seat member having an opening on the downstream side, and an opening of the valve seat member communicate with the cylindrical inner surface. A central chamber having a concave shape in an oblique direction with respect to the axial direction on the outer periphery of the valve body, a swirl groove for turning the fuel in the central chamber, and formed downstream of the central chamber, and having a cylindrical shape A plurality of swirl application chambers having an inner surface and configured to apply a turning force by swirling fuel therein, and connected to the swirl application chambers in a tangential direction of the swirl application chambers, and tangent to the central chamber A communication passage that is connected to the central chamber toward the direction and supplies fuel from the central chamber to the swirl application chamber, and an injection hole that is formed in a cylindrical shape at the bottom of the swirl application chamber and penetrates to the outside. In the fuel injection valve, the communication passage A side surface that is connected to a radially inner side of the swirl chamber is connected to a radially outer side of the central chamber, and a side line extending to a radially inner side of the swirl chamber is connected to the injection hole. It was formed so as to be in contact with or radially outside the injection hole.

  According to the present invention, it is possible to efficiently guide the fuel from the central chamber to the swirl chamber, suppress a decrease in the fuel flow velocity, and achieve atomization of the fuel.

It is an axial sectional view of the fuel injection valve of Example 1. It is an expanded sectional view near the swirl chamber of the fuel injection valve of Example 1. It is the top view which looked at the nozzle plate of Example 1 from the axial direction. FIG. 3 is a diagram illustrating the flow of fuel in a valve seat member when the valve is opened according to the first embodiment. It is a figure which shows the flow of the fuel from the center chamber at the time of valve opening of Example 1 to a swirl chamber. It is the figure which showed the nose plate of Example 2 which looked at the axial direction, and the flow of a fuel. It is the top view which looked at the nose plate of Example 3 from the axial direction, and the figure which shows the flow of fuel. It is the top view which looked at the nose plate of Example 4 from the axial direction, and the figure which shows the flow of fuel. It is the top view which looked at the nozzle plate of the other Example from the axial direction. It is an expanded sectional view near a swirl chamber of a fuel injection valve of other examples.

[Example 1]
The fuel injection valve 1 according to the first embodiment will be described.
[Configuration of fuel injection valve]
FIG. 1 is an axial sectional view of the fuel injection valve 1. The fuel injection valve 1 is used for an automobile engine or the like.
The fuel injection valve 1 includes a magnetic cylinder 2, a core cylinder 3 accommodated in the magnetic cylinder 2, a valve element 4 slidable in the axial direction, and a valve shaft formed integrally with the valve element 4. 5, a valve seat member 7 having a valve seat 6 that is closed by the valve body 4 when the valve is closed, a nozzle plate 8 having an injection hole through which fuel is injected when the valve is opened, and a direction in which the valve body 4 is opened when energized And an electromagnetic coil 9 to be slid and a yoke 10 for inducing magnetic flux lines.

The magnetic cylinder 2 is made of a metal pipe or the like formed of a magnetic metal material such as electromagnetic stainless steel, and is stepped as shown in FIG. 1 by using means such as deep drawing or pressing or grinding. It is integrally formed in a cylindrical shape. The magnetic cylinder 2 has a large-diameter portion 11 formed on one end side and a small-diameter portion 12 having a smaller diameter than the large-diameter portion 11 and formed on the other end side.
The small diameter portion 12 is formed with a thin portion 13 that is partially thinned. The small-diameter portion 12 includes a core tube housing portion 14 that houses the core tube body 3 on one end side from the thin wall portion 13, and a valve member 15 (valve body 4, valve shaft 5, valve seat member on the other end side from the thin wall portion 13 7) and is divided into a valve member accommodating portion 16 for accommodating. The thin portion 13 is formed so as to surround a gap portion between the core cylinder 3 and the valve shaft 5 in a state where the core cylinder 3 and the valve shaft 5 described later are accommodated in the magnetic cylinder 2. The thin wall portion 13 increases the magnetic resistance between the core tube housing portion 14 and the valve member housing portion 16, and magnetically blocks between the core tube housing portion 14 and the valve member housing portion 16.

The large diameter portion 11 constitutes a fuel passage 17 for sending fuel to the valve member 15, and a fuel filter 18 for filtering the fuel is provided at one end of the large diameter portion 11. A pump 47 is connected to the fuel passage 17. The pump 47 is controlled by a pump control device 54.
The core cylinder 3 is formed in a cylindrical shape having a hollow portion 19 and is press-fitted into the core cylinder housing portion 14 of the magnetic cylinder 2. The hollow portion 19 accommodates a spring receiver 20 fixed by means such as press fitting. A fuel passage 43 penetrating in the axial direction is formed at the center of the spring receiver 20.
The outer shape of the valve body 4 is formed in a substantially spherical shape, and has a swirl groove 21 formed in a concave shape obliquely with respect to the axial direction of the fuel injection valve 1 on the circumference. The valve shaft 5 has a large-diameter portion 22 and a small-diameter portion 23 whose outer shape is smaller than the large-diameter portion 22.

The valve body 4 is integrally fixed to the tip of the small diameter portion 23 by welding. In addition, the black semicircle and black triangle in a figure have shown the welding location. A spring insertion hole 24 is formed at the end of the large diameter portion 22. A spring seat 25 having a smaller diameter than the spring insertion hole 24 is formed at the bottom of the spring insertion hole 24, and a stepped spring receiving portion 26 is formed. A fuel passage hole 27 is formed at the end of the small diameter portion 23. The fuel passage hole 27 communicates with the spring insertion hole 24. A fuel outflow hole 28 penetrating the outer periphery of the small diameter portion 23 and the fuel passage hole 27 is formed.
The valve seat member 7 includes a substantially conical valve seat 6, a valve body holding hole 30 formed on the one end side from the valve seat 6 so as to be substantially the same as the diameter of the valve body 4, and one end opening side from the valve body holding hole 30. An upstream opening 31 having a larger diameter and a downstream opening 48 that opens to the other end of the valve seat 6 are formed.
The valve shaft 5 and the valve body 4 are accommodated in the magnetic cylinder 2 so as to be slidable in the axial direction. A coil spring 29 is provided between the spring receiver 26 and the spring receiver 20 of the valve shaft 5 to urge the valve shaft 5 and the valve body 4 to the other end side. The valve seat member 7 is inserted into the magnetic cylinder 2 so that the valve body 4 is seated on the valve seat 6, and is fixed to the magnetic cylinder 2 by welding.
An electromagnetic coil 9 is inserted into the outer periphery of the core cylinder 3 of the magnetic cylinder 2. That is, the electromagnetic coil 9 is disposed on the outer periphery of the core cylinder 3. The electromagnetic coil 9 includes a bobbin 32 formed of a resin material and a coil 33 wound around the bobbin 32. The coil 33 is connected to the electromagnetic coil control device 55 via the connector pin 34. The electromagnetic coil control device 55 energizes the coil 33 of the electromagnetic coil 9 according to the timing of injecting fuel into the combustion chamber calculated based on the information from the crank angle sensor that detects the crank angle. Open the valve.

The yoke 10 has a hollow through-hole, and has a large-diameter portion 35 formed on one end opening side, a medium-diameter portion 36 formed with a smaller diameter than the large-diameter portion 35, and a diameter smaller than the medium-diameter portion 36. It is composed of a small diameter portion 37 formed on the end opening side. The small diameter portion 37 is fitted on the outer periphery of the valve member housing portion 16. An electromagnetic coil 9 is accommodated on the inner periphery of the medium diameter portion 36. A connecting core 38 is disposed on the inner periphery of the large diameter portion 35.
The connecting core 38 is formed in a substantially C shape by a magnetic metal material or the like. The yoke 10 is connected to the magnetic cylinder 2 at the large-diameter portion 35 via the small-diameter portion 37 and the connecting core 38, that is, magnetically connected to the magnetic cylinder 2 at both ends of the electromagnetic coil 9. It becomes. An adapter 52 for connecting the fuel injection valve 1 to the intake valve of the engine is attached to the tip of the yoke 10 on the other end side.

When power is supplied to the electromagnetic coil 9 through the connector pin 34, a magnetic field is generated, and the valve body 4 and the valve shaft 5 are opened against the biasing force of the coil spring 29 by the magnetic force of the magnetic field.
As shown in FIG. 1 of the fuel injection valve 1, the intermediate diameter portion of the electromagnetic coil 9 and the yoke 10 is located up to the portion of the magnetic cylinder 2 excluding one end portion of the large diameter portion 11 and the electromagnetic coil 9 installation position of the small diameter portion 12. 36, the outer periphery of the connecting core 38 and the large-diameter portion 35, the outer periphery of the large-diameter portion 35, the outer periphery of the medium-diameter portion 36, and the outer periphery of the connector pin 34 are covered with a resin cover 53. The tip of the connector pin 34 is formed by opening a resin cover 53 so that the connector of the control unit can be inserted.
An O-ring 39 is provided on the outer periphery of one end of the magnetic cylinder 2, and an O-ring 40 is provided on the outer periphery of the small diameter portion 37 of the yoke 10.
A nozzle plate 8 is welded to the other end side of the valve seat member 7. The nozzle plate 8 is injected with three swirl chambers 41 that give a swirl (swirl force) to the fuel, a central chamber 42 that distributes the fuel to each swirl chamber 41, and fuel that has been swirled in the swirl chamber 41. An injection hole 44 is formed.

[Configuration of nozzle plate]
FIG. 2 is an enlarged cross-sectional view of the vicinity of the nozzle plate 8 of the fuel injection valve 1. FIG. 3 is a plan view of the nozzle plate 8 viewed from one axial end side. The cross section of the nozzle plate 8 in FIG. 2 is a cross section cut at the position AA in FIG.
A swirl chamber 41 and a central chamber 42 are formed on one side surface of the nozzle plate. The central chamber 42 is formed in a circular concave shape on the concentric axis of the valve seat member 7.

Three swirl chambers 41 are formed, each composed of a communication path 45 and a swirl imparting chamber 46. A side wall 45a radially outward with respect to the central chamber 42 of the communication passage 45 is formed on a tangent line of the central chamber 42, and the communication passage 45 as a whole extends in the tangential direction of the central chamber 42. A guide wall 49 that guides fuel from the central chamber 42 toward the communication path 45 is formed between the adjacent communication paths 45.
A swirling chamber 46 is formed at the tip of the communication path 45. The communication path 45 is formed so as to have a constant width as viewed from one end side in the axial direction. The swirl application chamber 46 is formed in a circular concave shape. An injection hole 44 is formed in the central portion of the swirl application chamber 46. The injection hole 44 penetrates toward the other end side. The communication path 45 is formed such that an extension line L of a side surface 45b connected to the side surface of the communication path 45 and radially inward of the swirl application chamber 46 circumscribes the injection hole 44. Note that the extension line L of the side surface 45b may be outside of the injection hole 44 in the radial direction without contacting the injection hole 44. The side surface 45 a is formed on the tangent line of the swirl application chamber 46.

[Action]
Next, the operation of the fuel injection valve 1 of the first embodiment will be described.
(Fuel atomization)
FIG. 4 is a diagram showing the flow of fuel in the valve seat member 7 when the valve is opened. FIG. 5 is a view showing the flow of fuel from the central chamber 42 to the swirl chamber 41 when the valve is opened. In FIG. 4, the valve seat member 7 is displayed as a skeleton with a dotted line.
When the valve is opened, the fuel is guided obliquely with respect to the axial direction when passing through the swirl groove 21 (for example, from the center of the valve body 4 toward the swirl chamber 46). After that, the fuel passes between the valve body 4 and the valve seat 6 while turning, and is supplied to the central chamber 42. The fuel supplied to the central chamber 42 flows along the guide wall 49 and flows into the swirl application chamber 46 through the communication passage 45. The fuel that has flowed into the swirl imparting chamber 46 swirls within the swirl imparting chamber 46 and is injected to be supplied to the injection holes 44 while having swirling energy. The fuel having the turning energy is injected while turning along the side wall portion of the injection hole 44. Therefore, the fuel injected from the injection hole 44 is scattered in the tangential direction of the injection hole 44. The fuel spray immediately after being injected from the injection hole 44 spreads conically in a thin liquid film state by the edge part of the opening part of the injection hole 44. Thereafter, the fuel in the liquid film state is separated into droplets that are atomized.
As a result, fuel vaporization can be promoted, and in particular, generation of nitrogen oxides and the like during low temperature starting can be reduced.

(Efficient fuel guidance)
In order to atomize the fuel, it is necessary to ensure the flow rate of the fuel in the swirl chamber 46. Therefore, it is necessary to efficiently supply fuel from the central chamber 42 to the swirl chamber 41.
Therefore, in the fuel injection valve 1 of the first embodiment, a curved guide wall 49 for guiding the fuel into the communication passage 45 is formed between the communication passages 45 connected to the central chamber 42. As a result, the fuel exiting the central chamber 42 toward the communication passage 45 collides with the guide wall 49, changes direction gently, flows from the central chamber 42 to the communication passage 45 without reducing the flow velocity, and then enters the swirl chamber 46. It is possible to suppress a decrease in the flow rate of the fuel, and fuel atomization can be promoted.
Further, in the fuel injection valve 1 according to the first embodiment, the extension line L of the side surface that connects the communication passage 45 to the inner side in the radial direction inside the swirl chamber 46 is circumscribed by the injection hole 44. Formed. As a result, the extension line L of the side surface in the radial direction of the swirl imparting chamber 46 of the communication passage 45 is formed so as to circumscribe the injection hole 44, so that it is possible to reduce the collision of the fuel with the wall of the communication passage 45 and direct injection. It enters into the injection hole 44 while maintaining the flow velocity toward the hole 44 and is injected while turning around the wall in the injection hole 44.

[effect]
The effects of the fuel injection valve 1 of the first embodiment are listed below.
(1) A valve body 4 provided slidably, a valve seat 6 on which the valve body 4 sits when the valve is closed, and a valve seat member 7 having a downstream opening 48 on the downstream side, and a valve seat member A central chamber 42 having a cylindrical inner surface communicated with the downstream opening 48 of the 7 and formed in a concave shape in an oblique direction with respect to the axial direction on the outer periphery of the valve body 4, and the fuel is swirled in the central chamber 42 A plurality of swirl application chambers 46 that are formed on the downstream side of the swirl groove 21 and the central chamber 42, have a cylindrical inner side surface, and turn the fuel inside to apply a turning force, and each swirl application chamber 46 The swirl application chamber 46 is connected to the swirl application chamber 46 in the tangential direction of the central chamber 42, the communication passage 45 is connected to the central chamber 42 in the tangential direction of the central chamber 42, and fuel is supplied from the central chamber 42 to the swirl application chamber 46. In the fuel injection valve 1 provided with a cylindrical injection hole 44 formed in the bottom of the application chamber 46 and penetrating to the outside, the center During the communication passage 45 adjacent to connect to 42, to form a curved guide wall 49 for guiding the fuel to the communication passage 45.
Therefore, the fuel that exits the central chamber 42 and travels toward the communication passage 45 collides with the guide wall 49, changes direction gently, and allows the fuel to flow from the central chamber 42 to the communication passage 45 by the guide wall 49 without reducing the flow velocity. In addition, it is possible to prevent a decrease in the flow rate of the fuel in the swirl application chamber 46, and to promote atomization of the fuel.

(2) The communication path 45 is formed such that an extension line L of a side surface 45 b that is a side surface of the communication path 45 and is connected to the radially inner side of the swirl imparting chamber 46 circumscribes the injection hole 44.
Therefore, the fuel directly enters the injection hole 44 while being swirled while maintaining the flow of the upstream swirl and is injected while being swirled, so that atomization of the fuel can be promoted.

[Example 2]
The fuel injection valve 1 of Example 2 is demonstrated. In the fuel injection valve 1 according to the first embodiment, the side wall 45a radially outside the central chamber 42 of the communication passage 45 is formed on the tangent line of the central chamber 42. In this configuration, in the fuel injection valve 1 according to the second embodiment, the step portion 45c is formed at the connection point between the side wall 45a of the communication passage 45 and the central chamber 42.
FIG. 6 is a plan view of the nose plate 8 viewed from one end side in the axial direction and a view showing the flow of fuel. 6A shows the entire nose plate, and FIG. 6B is an enlarged view of a portion indicated by a one-dot chain line circle B in FIG. 6A.
As shown in FIG. 6, a stepped portion 45 c is formed at a connection location between the side wall 45 a of the communication passage 45 and the central chamber 42. The step 45c is formed in a curved shape, the end on the central chamber 42 side is connected toward the tangential direction of the central chamber 42, and the end on the side wall 45a side is in the direction in which the side wall 45a extends. Connected.

[Action]
A curved stepped portion 45c is formed at the connection point between the side wall 45a of the communication passage 45 and the central chamber. As in the fuel flow shown in FIG. 6, turbulent flow does not occur when the fuel flows from the central chamber 42 to the communication passage 45a, and a decrease in the flow velocity can be suppressed.

[effect]
(3) On the side surface (side surface 45a) of the communication path 45, the step portion 45c is provided at a location connected to the radially outer side in the central chamber 42, and the step portion 45c is formed in a curved shape.
Therefore, when the fuel flows from the central chamber 42 to the communication passage 45a, turbulent flow does not occur and the reduction in the flow velocity can be suppressed.

Example 3
The fuel injection valve 1 of Example 3 will be described. The fuel injection valve 1 according to the first embodiment is formed such that the width of the communication passage 45 viewed from one end in the axial direction is constant. In the fuel injection valve 1 according to the third embodiment, this configuration is formed so that the width when viewed from one end side in the axial direction becomes narrower in the communication path 45 toward the swirl application chamber 46.
FIG. 7 is a plan view of the nose plate 8 viewed from one end side in the axial direction and a view showing the flow of fuel. As shown in FIG. 7, the radially inner side wall 45 b with respect to the central chamber 42 of the communication passage 45 is inclined with respect to the radially outer side wall 45 a with respect to the central chamber 42. It is formed so as to approach the radially outer side wall 45a with respect to the central chamber 42 as it goes. That is, as shown in FIG. 7, the communication passage 45 is formed so that the width viewed from one end side in the axial direction becomes narrower toward the swirl application chamber 46.

[Action]
A width of the communication path 45 as viewed from one end side in the axial direction is formed so as to become narrower toward the swirl application chamber 46. As a result, the flow rate of fuel increases from the central chamber 42 toward the swirl application chamber 46, and the turning force in the swirl application chamber 46 can be increased.

[effect]
(4) A side surface (side surface 45b) connected to a radially inner side of the swirl imparting chamber 46 on a side surface of the communication passage 45 (a side surface 45a) connected to a radially outer side of the swirl imparting chamber 46 It formed so that it might incline.
Therefore, the flow rate of fuel increases from the central chamber 42 toward the swirl imparting chamber 46, and the turning force in the swirl imparting chamber 46 can be increased.

Example 4
The fuel injection valve 1 according to the fourth embodiment will be described. In the fuel injection valve 1 according to the first embodiment, the radially outer side wall 45 a is connected to the radially outer side of the swirl application chamber 46 with respect to the central chamber 42 of the communication passage 45, and is connected to the central chamber 42 of the communication passage 45. The radially inner side wall 45 b was connected to the radially inner side of the swirl application chamber 46. In the fuel injection valve 1 according to the fourth embodiment, this configuration is such that the radially outer side wall 45a with respect to the central chamber 42 of the communication passage 45 is connected to the radial inner side of the swirl application chamber 46, The side wall 45b on the radially inner side with respect to 42 is connected to the radially outer side of the swirl application chamber 46.
FIG. 8 is a plan view of the nose plate 8 viewed from one end side in the axial direction and a view showing the flow of fuel. As shown in FIG. 8, the radially outer side wall 45 a with respect to the central chamber 42 of the communication passage 45 is connected to the radial inner side of the swirl application chamber 46, and is radially inward with respect to the central chamber 42 of the communication passage 45. The side wall 45 b is connected to the radially outer side of the swirl application chamber 46.
The communication path 45 is formed such that an extension line L of a side surface 45a that is a side surface of the communication path and is connected to a radially inner side of the swirl imparting chamber 46 circumscribes the injection hole 44. Note that the extension line L of the side surface 45a may be outside the injection hole 44 in the radial direction without being circumscribed by the injection hole 44. The side surface 45b is formed on the tangent line of the swirl application chamber 46.

[Action]
A radially outer side wall 45a with respect to the central chamber 42 of the communication passage 45 is connected to a radially inner side of the swirl application chamber 46, and a radially inner side wall 45b of the communication passage 45 with respect to the central chamber 42 is provided with a swirl. The chamber 46 is connected to the outside in the radial direction.
With this configuration, the rotation direction of the fuel in the swirl application chamber 46 can be reversed with respect to the rotation direction of the fuel in the central chamber 42, and the fuel is supplied to the swirl application chamber 46 while maintaining the flow rate from the central chamber 42. Can be introduced.

[effect]
(5) A valve body 4 slidably provided, a valve seat 6 on which the valve body 4 sits when the valve is closed, and a valve seat member 7 having a downstream opening 48 on the downstream side, and a valve seat member A central chamber 42 having a cylindrical inner surface communicated with the downstream opening 48 of the 7 and formed in a concave shape in an oblique direction with respect to the axial direction on the outer periphery of the valve body 4, and the fuel is swirled in the central chamber 42 A plurality of swirl application chambers 46 that are formed on the downstream side of the swirl groove 21 and the central chamber 42, have a cylindrical inner side surface, and turn the fuel inside to apply a turning force, and each swirl application chamber 46 The swirl application chamber 46 is connected to the swirl application chamber 46 in the tangential direction of the central chamber 42, the communication passage 45 is connected to the central chamber 42 in the tangential direction of the central chamber 42, and fuel is supplied from the central chamber 42 to the swirl application chamber 46. In the fuel injection valve 1 provided with an injection hole 44 formed in a cylindrical shape at the bottom of the application chamber 46 and penetrating to the outside, the communication The side surface 45b connected to the radially inner side of the swirl application chamber 46 is connected to the outer side of the central chamber 42 in the radial direction, and the extension line of the side surface 45a connected to the radially inner side of the swirl application chamber 46 is an injection line. It was formed so as to be in contact with the hole 44 or to be radially outside the injection hole 44.
Therefore, the rotation direction of the fuel in the swirl application chamber 46 can be reversed with respect to the rotation direction of the fuel in the central chamber 42, and the fuel flows into the swirl application chamber 46 while maintaining the flow rate from the central chamber 42. Can be made.

[Other Examples]
As mentioned above, although this invention has been demonstrated based on Example 1 thru | or Example 4, the concrete structure of each invention is not limited to each Example, The design change etc. of the range which does not deviate from the summary of invention Is included in the present invention.
9 and 10 are enlarged sectional views of the vicinity of the nozzle plate 8 of the fuel injection valve 1. In the fuel injection valve 1 of the first to fourth embodiments, the central chamber 42, the swirl chamber 41, and the injection hole 44 are formed in the nozzle plate 8. In this configuration, as shown in FIG. 9, an intermediate plate 50 is newly provided, a central chamber 42 and a swirl chamber 41 are formed in the intermediate plate 50, and an injection hole 44 is formed in the nozzle plate 8. good. In this case, the intermediate plate 50 and the nozzle plate 8 are both welded to the other end of the valve seat member 7. Further, as shown in FIG. 10, a central chamber 42 and a swirl chamber 41 may be formed at the other end of the valve seat member, and an injection hole may be formed in the nozzle plate 8.

1 Fuel injection valve
4 Disc
6 Valve seat
7 Valve seat member
8 Nozzle plate
21 swirl groove
41 Swirl room
42 Central room
44 injection hole
45 passage
46 Swirl grant room
48 Downstream opening (opening)
49 Guide wall

Claims (3)

A valve body slidably provided;
A valve seat on which the valve body sits when the valve is closed, and a valve seat member having an opening on the downstream side;
A central chamber communicating with the opening of the valve seat member and having a cylindrical inner surface;
A swirl groove formed on the outer periphery of the valve body in a concave shape in an oblique direction with respect to the axial direction, and swirling fuel in the central chamber;
A plurality of swirl application chambers that are formed downstream of the central chamber, have a cylindrical inner surface, and swirl fuel to impart a turning force;
The swirl application chamber is connected to the swirl application chamber in the tangential direction of each swirl application chamber and connected to the central chamber in the tangential direction of the central chamber, and fuel is supplied from the central chamber to the swirl application chamber. A passage,
An injection hole formed in a cylindrical shape at the bottom of the swirl application chamber and penetrating to the outside;
In a fuel injection valve equipped with
Forming a guide wall for guiding fuel in the communication path between the adjacent communication paths connected to the central chamber;
An extension line of a side surface that connects the communication path to a side surface of the communication path and radially inward of the swirl chamber is in contact with the injection hole or radially outside the injection hole , and the communication path The fuel injection valve according to claim 1, wherein the side wall radially outward of the central chamber is formed on a tangent line of the central chamber . The fuel injection valve according to claim 1, wherein
A fuel injection valve characterized in that a side surface of the communication path that is connected to a radially inner side in the swirl chamber is inclined with respect to a surface that is connected to a radially outer side of the swirl chamber. . A valve body slidably provided;
A valve seat on which the valve body sits when the valve is closed, and a valve seat member having an opening on the downstream side;
A central chamber communicating with the opening of the valve seat member and having a cylindrical inner surface;
A swirl groove formed on the outer periphery of the valve body in a concave shape in an oblique direction with respect to the axial direction, and swirling fuel in the central chamber;
A plurality of swirl application chambers that are formed downstream of the central chamber, have a cylindrical inner surface, and swirl fuel to impart a turning force;
The swirl application chamber is connected to the swirl application chamber in the tangential direction of each swirl application chamber and connected to the central chamber in the tangential direction of the central chamber, and fuel is supplied from the central chamber to the swirl application chamber. A passage,
An injection hole formed in a cylindrical shape at the bottom of the swirl application chamber and penetrating to the outside;
In a fuel injection valve equipped with
A side surface of the communication passage that is connected to a radially inner side of the swirl application chamber is connected to a radially outer side of the central chamber, and an extended line of the side surface connected to a radially inner side of the swirl application chamber, A fuel injection valve, wherein the fuel injection valve is formed so as to be in contact with the injection hole or radially outside the injection hole .

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