JP2009250122A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of preventing the excessive expansion of fuel injected from the fuel injection valve, even when a quantity of injecting fuel is increased. <P>SOLUTION: This fuel injection valve has a nozzle port plate having a nozzle port, a valve seat having a fuel passage and a valve seat part inside, and a valve member having an abutting part able to sit on the valve seat part and opening-closing the fuel passage when this abutting part is separated from the valve seat part or seated on the valve seat part. The nozzle port is composed of a plurality of first nozzle port parts and a second nozzle port part communicated with the downstream side of these first nozzle port parts and having a hole diameter larger than a hole diameter of the first nozzle port parts. The first nozzle port parts and the second nozzle port part are arranged in a position for crossing with an inner wall of the second nozzle port part by a virtual inner wall of extending an inner wall of the first nozzle port parts in the second nozzle port part, by inclining the axis of the first nozzle port parts at a predetermined angle to the axis of the second nozzle port part so that a fuel liquid mutually collides on the inner wall of the second nozzle port part after the fuel liquid injected from the different first nozzle port part collides with the inner wall of the second nozzle port part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluid injection valve including an injection hole plate, for example, a fuel injection valve that injects fuel into an internal combustion engine such as an automobile engine.

  2. Description of the Related Art Generally, a fuel injection valve is known that includes a thin injection hole plate having a plurality of injection holes formed on the downstream side of a fuel passage of a valve body formed by a valve and a valve seat, and injects fuel from each injection hole. ing. In the conventional fuel injection valve, an injection hole plate formed with an injection hole for injecting fuel flowing out from the fuel passage when the valve is opened is provided at the tip end portion of the valve body, and the injection hole has a plurality of first circles. The columnar holes correspond to each of the plurality of first columnar holes on a one-to-one basis, and are provided separately so as to communicate with the downstream side of the plurality of first columnar holes. And a plurality of second cylindrical holes inclined at a predetermined angle with respect to the central axis of the first cylindrical hole (for example, Patent Document 1, Patent Document 2, Patent Reference 3).

JP 2004-169572 A JP-A-4-136477 Japanese Patent Laid-Open No. 1-116280

  The fuel injected from the injection hole of the fuel injection valve configured as described above has a smaller amount of injected particles, which promotes the evaporation of the fuel and reduces the amount of fuel adhering to the inner wall of the engine. The fuel adhering to the inner wall of the engine is discharged as unburned fuel. In order to respond to the recent tightening of exhaust gas regulations for automobiles, it is necessary to reduce the amount of unburned fuel, and there is a demand for finer fuel injected from the fuel injection valve.

  However, in the conventional fuel injection valve, since the spread angle of the fuel injected from the nozzle hole depends on the amount of fuel to be injected, if the amount of fuel is increased, the injected fuel will be excessively expanded. There was a thing. If the injected fuel spreads too much, a part of the fuel liquid flows along the lower end surface of the nozzle hole plate and stays at the lower end surface of the nozzle hole plate.

  The fuel liquid injected from the first cylindrical hole of the nozzle hole of the nozzle hole plate collides with the inner wall of the second cylindrical hole, and spreads the inner wall to both sides in the circumferential direction to the outlet of the second cylindrical hole. Flowing. As a result, the fuel liquid becomes a thin liquid film along the inner wall at the outlet of the second cylindrical hole, and is sprayed from the second cylindrical hole to be atomized with good uniformity.

  At this time, if the amount of fuel to be injected is increased, a large amount of fuel liquid spreads too much on the inner wall of the second cylindrical hole. As a result, it has been found that the fuel injected from the second cylindrical hole to the outside of the fuel injection valve also spreads excessively.

  The present invention has been made to solve the above-described problems, and provides a fuel injection valve that can prevent excessive spread of fuel injected from a fuel injection valve even when the amount of fuel to be injected increases. The purpose is to provide.

  The fuel injection valve according to the present invention has an injection hole plate having injection holes, a valve seat having a fuel passage and a valve seat portion therein, and a contact portion that can be seated on the valve seat portion. A valve member that opens and closes the fuel passage by being separated from the valve seat portion or seated on the valve seat portion, and the injection hole communicates with the plurality of first injection hole portions and downstream of the first injection hole portion. After the fuel liquid injected from the different first nozzle holes collides with the inner wall of the second nozzle holes. In order for the fuel liquid to collide with each other on the inner wall of the second nozzle hole portion, the central axis of the first nozzle hole portion is inclined at a predetermined angle with respect to the central axis of the second nozzle hole portion, The first nozzle hole part and the second nozzle hole part are arranged at a position where a virtual inner wall obtained by extending the inner wall of the nozzle hole part into the second nozzle hole part intersects with the inner wall of the second nozzle hole part. Than is.

  ADVANTAGE OF THE INVENTION According to this invention, even when the quantity of the fuel to inject increases, the fuel injection valve which can prevent the excessive expansion of the fuel injected from a fuel injection valve is realizable.

Embodiment 1 FIG.
The first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram illustrating the entire fuel injection valve according to Embodiment 1, and FIG. In the drawings, the same reference numerals indicate the same or corresponding configurations.

  In FIG. 1, the longitudinal direction of the drawing is the axial direction of the fuel injection valve 1 in the drawing. Since the fuel flows through the fuel injection valve 1 from the upper side to the lower side of the page, the upper side is the upstream side and the lower side is the downstream side.

  In the fuel injection valve 1, an electromagnetic coil 3, a fixed iron core 4, and a metal plate 5 constituting a magnetic passage are disposed and integrally formed inside a resin housing 2. The electromagnetic coil 3 includes a resin bobbin 3a and a coil 3b wound around the outer periphery of the bobbin 3a, and is connected to a terminal 6 provided for connection to the outside.

  A bobbin 3a surrounds one end portion of the fixed iron core 4, and a magnetic pipe 9 constituting a magnetic path is provided coaxially with the fixed iron core 4 via a nonmagnetic pipe 11 at one end portion thereof. The nonmagnetic pipe 11 is fixed to the fixed iron core 4 and the magnetic pipe 9. A filter 16 is provided inside the other end of the fixed iron core 4, and an adjuster 8 is fixed. The adjuster 8 adjusts the load of the compression spring 7.

  One end of the metal plate 5 constituting the magnetic path is fixed to the fixed iron core 4 by welding and the other end is welded to the magnetic pipe 9 to magnetically connect the fixed iron core 4 and the magnetic pipe 9. Moreover, the movable iron core 10 is provided in the magnetic pipe 9 via the nonmagnetic pipe 11 so as to be movable in the axial direction. One end of a needle pipe 12 is inserted into the movable core 10 and fixed by welding, and a ball 13 as a valve member is fixed by welding to the other end of the needle pipe 12.

  The ball 13 acts so as to be pressed by the urging force of the compression spring 7 adjusted by the adjuster 8, and five flat surfaces 13 a parallel to the axial direction are provided on the outer periphery of the ball 13 at an equiangular pitch. ing. A valve seat 14 is provided in the downstream end of the magnetic pipe 9.

  In FIG. 2, the valve seat 14 is formed to be continuous with the valve seat portion 14 a formed in a truncated cone shape with the downstream side tapered, and the upstream side of the valve seat portion 14 a, and is equivalent to the diameter of the ball 13. And a cylindrical guide portion 14b having an inner diameter. Further, a cylindrical fuel passage 14c is formed continuously to the valve seat portion 14a and coaxially with the valve seat portion 14a.

  The ball 13 is guided by the guide portion 14b of the valve seat 14, and is arranged so that it can be seated and separated from the valve seat portion 14a of the valve seat 14 in conjunction with the axial movement of the needle pipe 12. The spherical surface 13b at the tip of the ball 13 serves as a contact portion that is seated on the valve seat portion 14a.

A disc-shaped first nozzle hole plate 17a having a plurality of first nozzle holes 18a, 18b, 18c, and 18d on the downstream end face of the valve seat 14 in the magnetic pipe 9 is a valve seat 14a. It is provided in close contact with the valve seat 14 coaxially. The first injection hole plate 17a and the valve seat 14 form a fuel cavity 15 that is coaxial with the valve seat 14a and has a circular cross section. The fuel cavity 15 allows the fuel passage 14c of the valve seat 14 and the first injection hole 18a. , 18b, 18c, and 18d.
Further, a disk-shaped second nozzle hole plate 17b having a plurality of second nozzle holes 20a and 20b is provided in close contact with the first nozzle hole plate 17a.

The operation of the fuel injection valve configured as described above will be described.
First, when the electromagnetic coil 3 is energized from the outside via the terminal 6, a magnetic flux is generated in a magnetic path constituted by the fixed iron core 4, the metal plate 5, the magnetic pipe 9 and the movable iron core 10, and the movable iron core 10 is fixed to the fixed iron core 4. Is attracted by magnetic attraction. As a result, the needle pipe 12 integrated with the movable iron core 10 moves upward in FIG. 1 against the urging force of the compression spring 7, and the ball 13 welded and fixed to the needle pipe 12 is connected to the valve seat. It leaves | separates from 14 valve-seat parts 14a, and takes a valve opening position.

  The fuel that has flowed into the main body of the fuel injection valve 1 through a derivative pipe (not shown) passes through the filter 16 and the adjuster 8 and the compression spring 7 that are arranged in the fixed iron core 4, the movable iron core 10, and the needle pipe. 12, then through the gap between the guide portion 14 b of the valve seat 14 and the flat surface 13 a of the ball 13 and the gap between the valve seat portion 14 a and the outer peripheral surface of the ball 13, and further through the fuel passage 14 c to the fuel cavity 15 is supplied. The fuel supplied to the fuel cavity 15 flows into the first nozzle holes 18a, 18b, 18c, 18d and the second nozzle holes 20a, 20b and is injected.

  On the other hand, when energization to the electromagnetic coil 3 is stopped, the magnetic attractive force that attracts the movable iron core 10 to the fixed iron core 4 disappears. As a result, the needle pipe 12 integrated with the movable iron core 10 is moved downward in FIG. 1 by the urging force of the compression spring 7, and the ball 13 abuts on the valve seat portion 14a of the valve seat 14 so that the valve closing position is reached. Take. Therefore, the fuel injection from the first nozzle holes 18a, 18b, 18c, 18d and the second nozzle holes 20a, 20b is stopped.

  FIG. 3 is a plan configuration diagram showing the first nozzle hole plate viewed from the upstream side of the fuel injection valve in the first embodiment, and FIG. 4 is a second configuration viewed from the upstream side of the fuel injection valve in the first embodiment. It is a plane block diagram which shows a nozzle hole part plate. FIG. 5 is a perspective view showing the configuration of a pair of first injection hole portion and second injection hole portion of the fuel injection valve in the first embodiment. In the drawings, the same reference numerals indicate the same or corresponding configurations.

  3 to 5, the first nozzle hole portions 18a and 18b and the second nozzle hole portion 20a have cylindrical shapes whose inner walls are parallel to each other, and the first nozzle hole plate 17a and the second nozzle hole portion, respectively. It is formed on the plate 17b. Two first nozzle holes 18a, 18b and one second nozzle hole 20a are configured to communicate with each other.

  The central axis C of the second injection hole portion 20a is inclined at a predetermined angle with respect to the central axis of the fuel injection valve 1. The central axes A and B of the two first nozzle holes 18a and 18b are inclined at a predetermined angle with respect to the central axis C of the second nozzle hole 20a.

  FIG. 6 is an explanatory diagram showing the positional relationship between the outlets 19a and 19b of the two first nozzle holes 18a and 18b and the inlet surface 21a of the second nozzle hole 20a. In the fuel injection valve 1 according to the first embodiment, the centers of the outlets 19a and 19b of the two first nozzle holes 18a and 18b are arranged on the major axis X of the ellipse of the inlet surface 21a of the second nozzle hole 20a. ing.

  7 and 8 are explanatory diagrams showing the relationship between the angles of the first injection hole portion and the second injection hole portion of the fuel injection valve in Embodiment 1, and the length of the ellipse at the inlet surface of the second injection hole portion. FIG. 7 shows a cross-section along axis X, ie line DD in FIG. In the drawings, the same reference numerals indicate the same or corresponding configurations.

  In FIG. 7, two first nozzle holes 18a and 18b have virtual inner walls 22a and 22b obtained by extending the respective inner walls into the second nozzle holes on the downstream side and intersect with the inner wall 23 of the second nozzle hole 20a. As described above, the second injection hole portion 20a is configured to be inclined at a predetermined angle with respect to the central axis C. More preferably, as shown in FIG. 8, all of the virtual inner walls 22a and 22b obtained by extending the inner walls of the first nozzle holes 18a and 18b into the second nozzle holes are included in the inner wall 23 of the second nozzle hole 20a. It is configured so as to be inclined.

  FIG. 9 is an explanatory view showing the flow of the fuel liquid in the second injection hole portion of the fuel injection valve in Embodiment 1 in comparison with the flow of the fuel liquid in the second injection hole portion of the conventional fuel injection valve. is there. In the drawings, the same reference numerals indicate the same or corresponding configurations.

  In FIG. 9A, the fuel liquid 24 injected from each of the two first nozzle holes 18a and 18b collides with the inner wall of the second nozzle hole 20a, and on both sides in the circumferential direction along the inner wall. While expanding, it flows to the outlet of the second injection hole 20a. In the first embodiment, since the two first nozzle holes 18a and 18b communicate with one second nozzle hole 20a, each of the two first nozzle holes 18a and 18b is provided. The fuel liquids 24 injected from each other collide with each other on the inner wall of the second injection hole 20a. Due to this collision, the flow of each fuel liquid 24 does not spread any more, and is jetted in the form of a thin liquid film along the inner wall at the outlet of the second injection hole 20a. As a result, the spread of the fuel injected from the outlet of the second injection hole 20a is suppressed, and the uniformity is finely atomized. Thereby, the fuel injection valve which can prevent the excessive expansion of the fuel injected from a fuel injection valve is realizable.

  On the other hand, in the case of the conventional fuel injection valve shown in FIG. 9B for comparison, one first injection hole 18 corresponds to one second injection hole 20a on a one-to-one basis. Therefore, when the amount of fuel is increased, the flow of the fuel liquid 24 on the inner wall of the second injection hole 20a increases in accordance with the amount of fuel, and a large amount of fuel liquid 24 is formed. It was too wide. As a result, the fuel injected from the second injection hole 20a to the outside of the fuel injection valve also spreads excessively.

  As described above, the fuel injection valve in the first embodiment is configured such that the fuel liquid 24 injected from each of the two first injection hole portions 18a and 18b collides with each other. However, the fuel liquid 24 does not spread too much.

  In this way, in order to configure the fuel liquid 24 injected from each of the two first nozzle holes 18a and 18b to collide with each other, each of the two first nozzle holes 18a and 18b is provided. It is desirable that the central axes A and B are inclined at an angle of 15 degrees or more with respect to the central axis C of the second nozzle hole portion 20a. More preferably, it may be arranged so as to be inclined at an angle of 30 degrees or more.

  In the first embodiment, the second nozzle hole portion 20a corresponding to the two first nozzle hole portions 18a and 18b, and the second nozzle hole portion 20b corresponding to the two first nozzle hole portions 18c and 18d, An example of a nozzle hole constituted by two sets of the first nozzle hole part and the second nozzle hole part was shown. In this case, the two nozzle holes are separated so as not to interfere with each other. It is desirable to be provided.

  On the other hand, as shown in an enlarged view of the main part of the modification in FIG. 10, the injection hole may be configured by only one set of the two first injection hole parts 18 a and 18 b and the one second injection hole part 20. Needless to say, the same effects as those of the first embodiment can be obtained.

Embodiment 2. FIG.
FIG. 11 is an explanatory view showing the positional relationship between the outlet of the first nozzle hole part and the inlet surface of the second nozzle hole part of the fuel injection valve in the second embodiment, and FIGS. 12 to 14 show modifications thereof. It is explanatory drawing. In the figure, the same reference numerals as those in the first embodiment shown in FIG. 6 indicate the same or corresponding configurations. In addition, since it is the same as Embodiment 1 about structure and operation | movement other than the positional relationship in the exit surface of a 1st nozzle hole part and the entrance surface of a 2nd nozzle hole part, description is abbreviate | omitted below.

  In the fuel injection valve in the first embodiment, an example in which two first nozzle holes and one second nozzle hole are set as one set of nozzle holes is shown. In the second embodiment, three or more nozzles are used. An embodiment in which the first nozzle hole portion and one second nozzle hole portion are a set of nozzle holes is shown.

  In FIG. 11, the outlets 19a, 19b, 19c, 19d of the four first nozzle holes are arranged at equal intervals in the circumferential direction of the surface 21a that forms the contour of the inlet of the second nozzle hole. Of the four first nozzle hole outlets 19a, 19b, 19c, 19d, the center of the two first nozzle hole outlets 19a, 19c is the length of the ellipse of the inlet surface 21a of the second nozzle hole part. Since it is arranged on the axis X, it is arranged symmetrically about the major axis X of this ellipse.

  The fuel injection valve configured as described above is configured such that the fuel liquids injected from the outlets 19a, 19b, 19c, and 19d of the four first nozzle holes collide with the adjacent fuel liquids, respectively. Therefore, it goes without saying that exactly the same effect as in the first embodiment can be obtained. Furthermore, the outlets 19a, 19b, 19c, 19d of the four first nozzle holes are arranged at equal intervals in the circumferential direction of the inlet surface 21a of the second nozzle hole, and the inlet surface 21a of the second nozzle hole Is arranged symmetrically about the major axis X of the ellipse, so that the spread of the fuel injected from the outlet of the second nozzle hole is also symmetrical, and a fuel injection valve in which the spread is uniformly suppressed is realized. Can do.

  Further, as shown in FIG. 12, all of the four outlets 19 a, 19 b, 19 c, 19 d of the first nozzle hole part are on the long axis X of the ellipse of the inlet face 21 a of the second nozzle hole part. Even if it is not arranged, it is arranged at equal intervals in the circumferential direction of the inlet face 21a of the second nozzle hole part, and is arranged symmetrically about the major axis X of the ellipse of the inlet face 21a of the second nozzle hole part. If so, the same effect can be obtained.

  In the second embodiment, an example in which four first nozzle holes and one second nozzle hole are used as one set of nozzle holes is shown. However, three first nozzle holes and one second nozzle hole are used. Even when the nozzle hole part is a set of nozzle holes, or when the five or more first nozzle hole parts and one second nozzle hole part are a set of nozzle holes, The outlets of the first nozzle hole portion are arranged at equal intervals in the circumferential direction of the inlet surface of the second nozzle hole portion, and are arranged symmetrically about the major axis of the ellipse of the inlet surface of the second nozzle hole portion. Needless to say, the same effects as those of the second embodiment can be obtained.

  On the other hand, as shown in the modified example in FIG. 13, the outlets 19a, 19b, 19c, 19d of the four first nozzle holes are arranged at equal intervals in the circumferential direction of the inlet surface 21a of the second nozzle hole. However, the long axis X of the ellipse of the inlet surface 21a of the second nozzle hole portion may be arranged asymmetrically. It goes without saying that the fuel injection valve configured as described above can achieve exactly the same effect as that of the first embodiment, but further, from the outlets 19a, 19b, 19c, 19d of the four first injection hole portions. It becomes possible to make the flow of the injected fuel liquid spirally swirl along the inner wall of the second nozzle hole portion, and to make the particles more uniform.

  Further, as shown in FIG. 14, the outlets 19 a, 19 b, 19 c, 19 d of the four first nozzle holes are arranged at unequal intervals in the circumferential direction of the inlet surface 21 a of the second nozzle hole. It is also possible. It goes without saying that the fuel injection valve configured as described above can achieve the same effect as that of the first embodiment, but further, the interval between the outlets of the two adjacent first injection hole portions is adjusted. Thus, it is possible to arbitrarily change the degree of collision between two adjacent fuel liquids. Thereby, not only the expansion of the fuel injected from the outlet of the second injection hole portion is suppressed, but also a fuel injection valve capable of adjusting the expansion method can be realized.

Embodiment 3 FIG.
FIG. 15 is an explanatory diagram showing the positional relationship and shape of the outlet of the first nozzle hole and the inlet surface of the second nozzle of the fuel injection valve in the third embodiment. In the figure, the same reference numerals as those in the first embodiment shown in FIG. 6 indicate the same or corresponding configurations. In addition, since it is the same as Embodiment 1 about structure and operation | movement other than the positional relationship in the exit surface of a 1st nozzle hole part and the entrance surface of a 2nd nozzle hole part, description is abbreviate | omitted below.

  In the fuel injection valves in the first and second embodiments, the first injection hole portion is shown as an example in which the side surface of the inner wall is a columnar shape. However, in the third embodiment, the first injection hole is shown. The embodiment which made the part the elliptical column shape whose side of the inner wall is parallel is shown.

  In FIG. 15, the outlets 19 a, 19 b, 19 c, 19 d of the four first nozzle holes are formed on the inlet surfaces 21 a of the corresponding second nozzle holes whose short axis Y direction is the shortest distance. It is arranged so as to coincide with the normal direction of the contour. Thus, it goes without saying that exactly the same effect as in the first embodiment can be obtained, and further, the fuel liquid injected from the outlets 19a, 19b, 19c, 19d of the first injection hole portion is injected into the second injection port. It is also possible to suppress the spread when colliding with the inner wall of the hole.

Embodiment 4 FIG.
FIG. 16 is an explanatory diagram showing the positional relationship and shape of the outlet of the first injection hole and the inlet of the second injection hole of the fuel injection valve in the fourth embodiment. In the figure, the same reference numerals as those in the first embodiment shown in FIG. 6 indicate the same or corresponding configurations. In addition, since it is the same as Embodiment 1 about structure and operation | movement other than the positional relationship in the exit surface of a 1st nozzle hole part and the entrance surface of a 2nd nozzle hole part, description is abbreviate | omitted below.

  In the fuel injection valve in the first to third embodiments, the second injection hole portion is shown as an example in which the side surface of the inner wall is a columnar shape. However, in the fourth embodiment, the second injection hole is provided. The embodiment which made the part the elliptical column shape whose side of the inner wall is parallel is shown.

  In FIG. 16, the centers of the outlets 19a and 19b of the two first nozzle holes are arranged on the major axis X of the ellipse of the inlet surface 21a of the second nozzle hole. Thus, it goes without saying that exactly the same effect as in the first embodiment can be obtained, and further, the first injection hole is formed by making the second injection hole part into an elliptic cylinder shape whose side walls of the inner wall are parallel. When the fuel liquid injected from the outlets 19a and 19b of the part collides with the inner wall of the second injection hole part, it is possible to suppress the expansion of the second injection hole part in the elliptical short axis Y direction.

  In the fuel injection valve in each of the above embodiments, the shape of the first injection hole portion or the second injection hole portion is a cylindrical shape in which the side surface of the inner wall is parallel, or an elliptic cylinder shape in which the side surface of the inner wall is parallel. Although an example has been shown, the present invention is not limited to this example. For example, it is needless to say that the same effect as in the first embodiment can be obtained even in a polygonal column shape.

  The above embodiments can also be used in combination with each other, and the same effects as the respective effects in each embodiment can be obtained.

1 is a cross-sectional configuration diagram illustrating an entire fuel injection valve in a first embodiment. FIG. 2 is a partial cross-sectional configuration diagram illustrating, in an enlarged manner, a main part of an injection part in an E part of FIG. 1. FIG. 3 is a plan configuration diagram showing a first nozzle hole plate as viewed from the upstream side of the fuel injection valve in the first embodiment. FIG. 3 is a plan configuration diagram showing a second nozzle hole plate as viewed from the upstream side of the fuel injection valve in the first embodiment. FIG. 3 is a perspective view showing a configuration of a pair of first injection hole portions and second injection hole portions of the fuel injection valve in the first embodiment. FIG. 6 is an explanatory diagram showing a positional relationship between the outlets of two first nozzle holes and the inlet surface of a second nozzle hole of the fuel injection valve in the first embodiment. FIG. 5 is an explanatory diagram showing a relationship between angles of a first injection hole portion and a second injection hole portion of the fuel injection valve in the first embodiment. FIG. 5 is an explanatory diagram showing a relationship between angles of a first injection hole portion and a second injection hole portion of the fuel injection valve in the first embodiment. It is explanatory drawing which shows the flow of the fuel liquid in the 2nd nozzle hole part of the fuel injection valve in Embodiment 1 in contrast with the conventional flow. It is a fragmentary sectional block diagram which expands and shows the principal part of the modification of the injection part in the E section of FIG. FIG. 6 is an explanatory diagram showing a positional relationship between an outlet of a first nozzle hole part and an inlet surface of a second nozzle hole part of a fuel injection valve in a second embodiment. FIG. 10 is an explanatory view showing a modification of the positional relationship between the outlet of the first nozzle hole part and the inlet surface of the second nozzle hole part of the fuel injection valve in the second embodiment. FIG. 10 is an explanatory view showing a modification of the positional relationship between the outlet of the first nozzle hole part and the inlet surface of the second nozzle hole part of the fuel injection valve in the second embodiment. FIG. 10 is an explanatory view showing a modification of the positional relationship between the outlet of the first nozzle hole part and the inlet surface of the second nozzle hole part of the fuel injection valve in the second embodiment. FIG. 10 is an explanatory diagram showing a positional relationship and a shape at an outlet face of a first injection hole portion and an inlet face of a second injection hole portion of a fuel injection valve in a third embodiment. It is explanatory drawing which shows the positional relationship and shape in the exit surface of the 1st nozzle hole part of the fuel injection valve in Embodiment 4, and the entrance surface of a 2nd nozzle hole part.

Explanation of symbols

1 Fuel injection valve,
18, 18a, 18b, 18c, 18d first nozzle hole part,
19a, 19b, 19c, 19d outlet of the first nozzle hole,
20, 20a, 20b second nozzle hole part,
21a The entrance surface of the second nozzle hole part,
22a, 22b The virtual inner wall which extended the inner wall of the 1st nozzle hole part,
23 The inner wall of the second nozzle hole,
24 fuel liquid,
A, B Central axis of the first nozzle hole part, C Central axis of the second nozzle hole part,
X long axis, Y short axis

Claims (9)

A nozzle hole plate having a nozzle hole;
A valve seat having a fuel passage and a valve seat inside;
A valve member that has a contact portion that can be seated on the valve seat portion, and that opens and closes the fuel passage when the contact portion is separated from the valve seat portion or seated on the valve seat portion;
The nozzle hole includes a plurality of first nozzle holes and a second nozzle hole having a diameter larger than that of the first nozzle hole communicated downstream of the first nozzle hole. ,
After the fuel liquid injected from the different first nozzle hole portions collides with the inner wall of the second nozzle hole portion, the fuel liquid collides with each other on the inner wall of the second nozzle hole portion,
The central axis of the first nozzle hole part is inclined at a predetermined angle with respect to the central axis of the second nozzle hole part,
At the position where the virtual inner wall that extends the inner wall of the first nozzle hole portion into the second nozzle hole portion intersects the inner wall of the second nozzle hole portion,
A fuel injection valve in which the first nozzle hole part and the second nozzle hole part are arranged. At a position where a virtual inner wall extending the inner wall of the first nozzle hole part into the second nozzle hole part intersects so as to be included in the inner wall of the second nozzle hole part,
The fuel injection valve according to claim 1, wherein the first nozzle hole part and the second nozzle hole part are arranged. The central axis of the first nozzle hole part is inclined at an angle of 15 degrees or more with respect to the central axis of the second nozzle hole part,
The fuel injection valve according to claim 1 or 2, wherein the first nozzle hole part and the second nozzle hole part are arranged. The central axis of the first nozzle hole part is inclined at an angle of 30 degrees or more with respect to the central axis of the second nozzle hole part,
The fuel injection valve according to claim 1 or 2, wherein the first nozzle hole part and the second nozzle hole part are arranged. A plurality of the nozzle holes configured from the first nozzle hole part and the second nozzle hole part corresponding to the first nozzle hole part,
The fuel injection valve according to any one of claims 1 to 4, wherein the fuel injection valves are provided separately from each other. The outlets of the first nozzle holes are equally spaced in the circumferential direction of the surface forming the contour of the inlet of the corresponding second nozzle hole,
The fuel injection valve according to any one of claims 1 to 5, wherein the first injection hole portion is disposed. The second nozzle hole portion is configured in a columnar shape or an elliptical column shape,
So that the outlet of the first nozzle hole is axisymmetric with respect to the major axis of the ellipse that forms the contour of the inlet of the corresponding second nozzle hole,
The fuel injection valve according to any one of claims 1 to 6, wherein the first injection hole portion is disposed.   The fuel injection valve according to any one of claims 1 to 7, wherein the first injection hole portion is formed in a columnar shape. The first nozzle hole part is configured in an elliptical columnar shape,
The short axis direction of the ellipse that forms the contour of the outlet of the first nozzle hole part coincides with the normal direction of the contour of the inlet of the corresponding second nozzle hole part that is at the shortest distance, respectively.
The fuel injection valve according to any one of claims 1 to 7, wherein the first injection hole portion is disposed.

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