JP6141350B2 - Fuel injection valve - Google Patents

Description

  The present invention relates to a fuel injection valve used to supply fuel to an internal combustion engine of an automobile, and more particularly to a fuel injection valve that promotes atomization in spray characteristics.

In recent years, as exhaust gas regulations for automobile internal combustion engines and the like have been strengthened, atomization of fuel spray injected from a fuel injection valve has been demanded. In the prior art shown in Patent Document 1, various studies have been made to achieve atomization by forming a swirl flow.
According to claim 14 of Patent Document 1, a single injection is arranged on a disk with injection holes provided on the downstream side of the valve seat body in which the valve openings are formed at a radial interval with respect to the valve openings. There is described a valve in which a hole is present and two arcuate vortex forming passages arranged mirror-image-symmetrically with each other are guided in the vortex forming chamber of the single injection hole.
In the case of this valve, fuel is introduced into the vortex forming chamber from the tangential direction of the vortex forming chamber by two vortex forming passages communicating with the valve opening, thereby generating a swirling flow in the vortex forming chamber and finely spraying the fuel spray. It has come to become.

WO2013-023838

In the valve described in Patent Document 1, the vortex forming passage has an arc shape, and as the main flow of fuel flows through the passage, it is biased toward the radially outer wall due to centrifugal force. Is not rectified in the tangential direction of the vortex formation chamber from the vortex formation passage on the side close to the center of the valve seat body (corresponding to the first swirl passage of the present invention), but directly enters the nozzle hole As a result, a sufficient swirl flow is not generated in the vortex forming chamber, and there is a problem that atomization of the fuel spray deteriorates.
In order to improve the deterioration of atomization of the fuel spray, there is a method of rectifying the fuel introduced from the passage into the vortex formation chamber in the tangential direction of the vortex formation chamber by lengthening the vortex formation passage. Then, there is a problem that the overall configuration becomes large and the layout property is deteriorated.
In addition, since the dead volume increases by the length of the passage, fuel that is insufficiently rectified and accelerated is injected immediately after the start of injection, and the atomization of fuel spray at the initial stage of injection deteriorates. there were.

  An object of the present invention is to solve such a problem, and it is possible to generate a sufficient swirling flow in the swirl chamber to improve atomization of fuel spray while having a compact structure as a whole. It aims at providing the fuel injection valve which becomes.

The fuel injection valve according to the present invention comprises:
A valve body that opens and closes the valve seat opening of the valve seat, and operates the valve body in response to an operation signal from a control device, so that fuel flows between the valve body and the valve seat sheet portion of the valve seat. A fuel injection valve that is injected toward the outside from an injection hole formed in an injection hole plate attached to a distal end surface on the downstream side of the valve seat,
The upstream end face of the nozzle hole plate is
A swirl chamber formed outside the valve seat opening in the radial direction, the swirl chamber having a space in which the nozzle hole is opened and the fuel is swirled continuously over the entire circumference of the nozzle hole ;
The upstream end communicates with the valve seat opening, and the downstream end extends from the circumferential direction around the valve seat central axis, which is the central axis of the valve seat, to the nozzle hole center, which is the center of the nozzle hole. A first swirl passage for introducing the fuel into the swirl chamber region on the side close to the valve seat central axis side;
The upstream end communicates with the valve seat opening, and the downstream end pivots away from the valve seat central axis with respect to the nozzle hole center from a circumferential direction centering on the valve seat central axis. And a second turning passage for introducing the fuel from a direction opposite to the direction of the fuel flowing through the first turning passage.

According to the fuel injection valve of the present invention, the first turning passage introduces fuel into the region of the turning chamber closer to the valve seat center axis side with respect to the nozzle hole center, and the second turning passage is Fuel is introduced into the swirl chamber region far from the valve seat center axis with respect to the nozzle hole center.
Therefore, the fuel introduced into the swirl chamber from the first swirl passage does not easily enter the nozzle hole, and a sufficient swirl flow can be generated in the swirl chamber, so that atomization of fuel spray can be promoted.
Moreover, since it is not necessary to lengthen the first swirl passage and rectify the fuel in the tangential direction of the swirl chamber, the overall configuration can be made compact.

It is sectional drawing which shows the fuel injection valve of Embodiment 1 of this invention. It is sectional drawing which shows the front-end | tip part of the fuel injection valve of FIG. It is a figure which shows a nozzle hole plate along the III-III line of FIG. FIG. 4 is an enlarged view of FIG. 3. It is an enlarged view which shows the swirl chamber of FIG. 4, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 2 of this invention, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 3 of this invention, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 4 of this invention, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 5 of this invention, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 6 of this invention, and its periphery. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 7 of this invention, and its periphery. It is the figure which looked at the nozzle hole of the fuel injection valve of FIG. 11 from the downstream of the fuel. It is the figure which looked at the nozzle hole of the fuel injection valve of Embodiment 8 of this invention from the downstream of the fuel. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 9 of this invention, and its periphery. It is the figure which looked at the nozzle hole of the fuel injection valve of FIG. 14 from the downstream of the fuel. It is an enlarged view which shows the turning chamber of the fuel injection valve of Embodiment 10 of this invention, and its periphery. It is sectional drawing which shows a nozzle hole plate along the XVII-XVII line of FIG.

  Hereinafter, the fuel injection valve of each embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a cross-sectional view showing a fuel injection valve 1 according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a tip portion of the fuel injection valve 1 of FIG. 1, and FIG. 3 is taken along the line III-III of FIG. 4 is a view showing the nozzle hole plate 13, FIG. 4 is an enlarged view showing the nozzle hole plate 13 of FIG. 3, and FIG. 5 is an enlarged view showing the swirl chamber 19 of FIG.
The fuel injection valve 1 is attached to an intake pipe of an internal combustion engine, and a tip portion thereof faces an intake port of the internal combustion engine so that fuel is injected downward.
The fuel injection valve 1 includes a solenoid device 4 that generates an electromagnetic force, and a valve device 9 that operates when the solenoid device 4 is energized.

  The solenoid device 4 is provided on a housing 5 that forms a yoke portion of a magnetic circuit, a core 6 that is a fixed iron core provided inside the housing 5, a coil 7 that surrounds the core 6, and a lower side of the core 6. And an amateur 8 that is a movable iron core that reciprocates.

  The valve device 9 has a cylindrical shape, a valve main body 11 that is press-fitted and welded to the outer diameter portion of the tip of the core 6, a valve seat 12 that is provided inside the valve main body 11, and a downstream side of the valve seat 12. The nozzle hole plate 13 provided on the side, the valve body 10 provided on the inner side of the valve body 11, and the compression spring 16 provided on the upper side of the valve body 10 are provided. The valve seat 12 includes a conical valve seat portion 12a and a valve seat opening 12b centered on the valve seat central axis 12c.

The valve body 10 includes a hollow rod 60 that is press-fitted and welded to the inner surface of the armature 8, and a ball 15 that is fixed to the tip of the rod 60 by welding. The ball 15 has a chamfered portion 15 a parallel to the axis of the fuel injection valve 1.
The nozzle hole plate 13 has a peripheral edge bent downward and is welded to the distal end surface of the valve seat 12 and the inner peripheral side surface of the valve body 11. The nozzle hole plate 13 is formed with a plurality of nozzle holes 14 having a circular cross section penetrating in the plate thickness direction.

The injection hole plate 13 has an injection hole 14 at the upstream end face, that is, the upper surface of the fuel, and a swirl chamber 19 is formed on the radially outer side of the valve seat opening 12b. In this embodiment, four swirl chambers 19 are formed at equal intervals in the circumferential direction, that is, facing each other.
In FIG. 5, the left end of the swirl chamber 19 is continuously connected to the downstream end of the first swirl passage 18a. The upstream end of the first turning passage 18 a is continuously connected to the common fuel introduction path 17. The first turning passage 18a biases the fuel toward the valve seat center axis 12c with respect to the nozzle hole center 14a of the turning chamber 19 from a substantially circumferential direction centered on the valve seat center axis 12c, as indicated by an arrow A. I will guide you.
That is, the extension line L, which is the downstream end of the first turning passage 18a and is tangent to the first passage side wall 18c on the side away from the valve seat central shaft 12c, has a valve seat central axis more than the nozzle hole center 14a. As a result, the fuel is guided to the region of the swirl chamber 19 on the side closer to the valve seat central shaft 12c side with respect to the nozzle hole center 14a.

In FIG. 5, the right end of the swirl chamber 19 is continuously connected to the downstream end of the second swirl passage 18b. The upstream end of the second turning passage 18 b is continuously connected to the common fuel introduction passage 17. As shown by the arrow B, the second turning passage 18b is located on the opposite side to the valve seat center axis 12c side with respect to the nozzle hole center 14a of the turning chamber 19 from a substantially circumferential direction centered on the valve seat center axis 12c. Guide the fuel evenly.
That is, the fuel is guided to the region of the swirl chamber 19 opposite to the valve seat central shaft 12c with respect to the nozzle hole center 14a.
The nozzle hole plate 13 is formed with a swirl chamber 19, a first swirl passage 18 a, a second swirl passage 18, and a common fuel introduction path 17 by forming a recess.

Next, the operation of the fuel injection valve 1 configured as described above will be described.
When an operation signal is sent from the engine control device to the drive circuit of the fuel injection valve 1, a current is passed through the coil 7 of the fuel injection valve 1, and a magnet composed of the armature 8, the core 6, the housing 5, and the valve body 11. Magnetic flux is generated in the circuit, and the armature 8 is attracted toward the core 6 against the elastic force of the compression spring 16, and the valve body 10 that is integrated with the armature 8 is separated from the valve seat portion 12a.
As a result, a gap is formed between the chamfered portion 15a of the ball 15 and the valve seat portion 12a, and fuel is injected from the plurality of injection holes 14 into the engine intake passage through the gap.
In this valve open state, the upper surface 8 a of the armature 8 is in contact with the lower surface of the core 6.

  Next, when an operation stop signal is sent from the engine control device to the drive circuit of the fuel injection valve 1, the energization of the current in the coil 7 is stopped, the magnetic flux in the magnetic circuit is reduced, and the valve body 10 is closed. The clearance between the valve body 10 and the valve seat portion 12a is closed by the elastic force of the compression spring 16 being pushed in the direction, and fuel injection is completed.

According to the fuel injection valve 1 configured as described above, the extension line L extending into the swirl chamber 19 from the downstream end of the first swirl passage 18a faces the valve seat central shaft 12c side from the nozzle hole center 14a. Yes.
Accordingly, the main flow 21a of the fuel flow indicated by the arrow A shown in FIG. 5 flowing into the first turning passage 18a from the valve seat opening 12b through the common fuel introduction passage 17 is less directly entered into the injection hole 14. A large amount of fuel can be directed to the swirl chamber side wall 19a of the swirl chamber 19, and a strong swirl flow along the inner portion of the swirl chamber side wall 19a can be generated.
Further, the main flow 21b of the fuel flow indicated by the arrow B shown in FIG. 5 flowing into the second turning passage 18b from the valve seat opening 12b is also caused by centrifugal force because the passage shape of the second turning passage 18b is substantially circular. Since the flow is biased toward the radially outer second passage side wall 18d and flows along the outer portion of the swirl chamber side wall 19a as it is, a strong swirl flow can be generated.

As described above, in the fuel injection valve 1 of this embodiment, the two fuel flows introduced into the swirl chamber 19 from the first swirl passage 18a and the second swirl passage 18b are described in Patent Document 1 described above. There is no inconvenience as in the case of the valve, and any of them can generate a sufficient swirl flow in the swirl chamber 19.
As a result, the thickness of the liquid film formed by pressing the fuel flowing into the nozzle hole 14 against the inner wall of the nozzle hole 14 while turning can be made uniform and the droplet diameter can be reduced. It is possible to inject fuel particles that are uniform and have good atomization.

Further, in this embodiment, in order to generate a swirl flow in the swirl chamber 19, the downstream end of the first swirl passage 18a and the first passage side wall 18c on the side away from the valve seat central shaft 12c. The extension line L, which is a tangent line, extends toward the valve seat central axis 12c side from the nozzle hole center 14a, so there is no inconvenience like the valve described in Patent Document 1 described above, and the first turning Even if the passage 18a is short, the fuel rectified in the tangential direction of the swirl chamber 19 is introduced, and the ratio of the fuel directly entering the nozzle hole 14 is reduced.
Accordingly, since the entire fuel passage can be made compact, the dead volume can be kept small, and deterioration of atomization immediately after the start of injection can be avoided.

In this embodiment, the entire structure of the fuel passage provided in the nozzle hole plate 13 is composed of the swirl chamber 19, the first swirl passage 18a, and the second swirl passage 18b. Four swirl chambers 19 are arranged so as to be 90 ° rotationally symmetric with respect to the valve seat central axis 12c to form a multi-hole.
Accordingly, the amount of fuel injected from each nozzle hole 14 can be reduced as compared with the case where there is one nozzle hole in a single swirl chamber. The liquid film is thinned and the degree of atomization is improved.
In this embodiment, the first swirl passage 18a and the second swirl passage 18b sandwiched between two adjacent swirl chambers 19 are upstream, and the common fuel introduction passage 17 communicates with the valve seat opening 12b. The swirl chamber 19, the first swirl path 18a, and the second swirl path 18b are compared with those in which the fuel introduction paths that lead to the respective swirl paths are provided on a one-to-one basis. Is easy to arrange.
For this reason, not only is it easy to increase the number of nozzle holes, but the dead volume is accommodated in a compact configuration while ensuring the spacing between the swirl chamber 19 and the first swirl passage 18a and the second swirl passage 18b. Since it can be reduced, a good atomized spray can be obtained immediately after the start of injection.
Further, the nozzle hole plate 13 is formed with the swirl chamber 19, the first swirl passage 18a, the second swirl passage 18 and the common fuel introduction passage 17 at the same time by molding the recess, so that the manufacturing cost is reduced.

Embodiment 2. FIG.
FIG. 6 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 according to the second embodiment of the present invention and its periphery.
In the fuel injection valve 1 according to the second embodiment, the tangent line of the first passage side wall 18c at the downstream end of the first turning passage 18a communicating with the turning chamber 19 and away from the valve seat central shaft 12c. An angle θ1 formed by a certain extension line L and a tangent line 40 of the swirl chamber side wall 19a at the intersection 30 between the extension line L and the swirl chamber side wall 19a of the swirl chamber 19 is set to be 90 ° or less.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

According to the fuel injection valve 1 of this embodiment, the direction of the main flow 21a of the fuel introduced from the first turning passage 18a into the turning chamber 19 is a direction away from the injection hole center 14a, as indicated by an arrow A, The fuel directly entering the nozzle hole 14 can be reduced, and a large amount of fuel can be directed to the swirl chamber side wall 19a of the swirl chamber 19, so that a strong swirl flow along the swirl chamber side wall 19a can be generated.
Accordingly, as in the first embodiment, a uniform and strong swirl flow can be generated in the swirl chamber 19, so that the liquid film thickness formed in the nozzle hole 14 can be made uniform and thin. In addition, fuel particles having a uniform droplet diameter and good atomization can be injected.

Embodiment 3 FIG.
FIG. 7 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 according to the third embodiment of the present invention and its periphery.
In the fuel injection valve 1 of the third embodiment, the injection hole center 14a of the injection hole 14 and the first passage side wall at the downstream end of the first turning passage 18a and away from the valve seat central shaft 12c. When the shortest distance to the extension line L which is a tangent line 18c is La, the radius of the swirl chamber 19 is r, and the passage width of the first swirl passage 18a is ha, the relationship La> r−ha is established. ing.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

According to the fuel injection valve 1 of this embodiment, the direction of the main flow 21a of the fuel introduced from the first turning passage 18a into the turning chamber 19 is a direction away from the injection hole center 14a, as indicated by an arrow A, The fuel directly entering the nozzle hole 14 can be reduced, and a large amount of fuel can be directed to the swirl chamber side wall 19a of the swirl chamber 19, so that a strong swirl flow along the side wall 19a of the swirl chamber 19 can be generated.
Accordingly, as in the first embodiment, a uniform and strong swirl flow can be generated in the swirl chamber 19, so that the liquid film thickness formed in the nozzle hole 14 can be made uniform and thin. In addition, fuel particles having a uniform droplet diameter and good atomization can be injected.

Embodiment 4 FIG.
FIG. 8 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 according to the fourth embodiment of the present invention and its periphery.
In the fuel injection valve 1 of the fourth embodiment, the injection hole center 14a is shifted in a direction away from the extension line L with respect to the swirl chamber center 19c that is the center of the swirl chamber 19.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

According to the fuel injection valve 1 of this embodiment, the nozzle hole center 14a is arranged so that the direction of the main flow 21a of the fuel introduced into the swirl chamber 19 from the first swirling passage 18a is indicated by an arrow A. The amount of fuel directly entering the nozzle hole 14 can be reduced, and a large amount of fuel can be directed to the side wall 19a of the swirl chamber 19 to generate a strong swirl flow along the swirl chamber side wall 19a. Can be made.
Accordingly, a homogeneous and strong swirl flow can be generated in the swirl chamber 19 as in the first embodiment, so that the liquid film thickness formed in the nozzle hole 14 can be made uniform and thinned. Fuel particles having a uniform droplet diameter and good atomization can be injected.

Embodiment 5. FIG.
FIG. 9 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 according to the fifth embodiment of the present invention and its periphery.
In the fuel injection valve 1 according to the fifth embodiment, the valve seat central shaft 12c becomes downstream toward the first passage side wall 18c at the downstream end of the first turning passage 18a and far from the valve seat central shaft 14a. The taper-shaped convex part 50 which the amount which protrudes to the side increased is provided.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

According to the fuel injection valve 1 of the fifth embodiment, the direction of the main flow 21a of the fuel introduced into the swirl chamber 19 from the first swirl passage 18a is a direction away from the nozzle hole center 14a as shown by an arrow A, The fuel directly entering the nozzle hole 14 can be reduced, and a large amount of fuel can be directed to the swirl chamber side wall 19a of the swirl chamber 19, so that a strong swirl flow along the side wall 19a of the swirl chamber 19 can be generated.
Accordingly, a homogeneous and strong swirl flow can be generated in the swirl chamber 19 as in the first embodiment, so that the liquid film thickness formed in the nozzle hole 14 can be made uniform and thinned. Fuel particles having a uniform droplet diameter and good atomization can be injected.

Embodiment 6 FIG.
FIG. 10 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 according to Embodiment 6 of the present invention and its periphery.
In the fuel injection valve 1 of the sixth embodiment, as compared with the swirl chamber 19 of the first embodiment, the swirl chamber 19 is for the second swivel by an angle θ2 in a substantially circumferential direction centering on the valve seat central axis 12c. It is arranged closer to the passage 18b (clockwise), and the passage length of the first turning passage 18a is longer than the passage length of the turning passage 18b.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

According to the fuel injection valve 1 of the sixth embodiment, since the long straight portion 18e can be provided in front of the downstream end portion of the first turning passage 18a, the fuel flow flowing in the straight portion 18e is rectified. Then, as the main flow 21a of the fuel flow approaches the downstream end, it is deflected from the first passage side wall 18c side toward the passage center. The main flow 21a of the fuel continues in a direction away from the nozzle hole center 14a as shown by an arrow A, so that the fuel directly entering the nozzle hole 14 can be reduced, and a large amount of fuel can be directed to the swirl chamber side wall 19a. Thus, a strong swirl flow along the swirl chamber side wall 19a of the swirl chamber 19 can be generated.
Accordingly, a homogeneous and strong swirl flow can be generated in the swirl chamber 19 as in the first embodiment, so that the liquid film thickness formed in the nozzle hole 14 can be made uniform and thinned. Fuel particles having a uniform droplet diameter and good atomization can be injected.
Further, the distance between the adjacent common fuel introduction paths 17 is maintained, and the length of the first turning passage 18a is increased, so that the length of the second turning passage 18c is shortened. Compared with the case where 19 is not disposed near the second swirling flow path 18b, the dead volume of the fuel passage is hardly changed, and the layout is not impaired.

Embodiment 7 FIG.
FIG. 11 is an enlarged view showing the swirl chamber 19 of the fuel injection valve 1 and its periphery according to Embodiment 7 of the present invention, and FIG. 12 is a view of the injection hole of the fuel injection valve 1 of FIG. 11 from the downstream side of the fuel. FIG.
In the fuel injection valve 1 according to the seventh embodiment of the present invention, the swirling directions of the swirling flows 22 of all fuels are the same (counterclockwise) as shown by arrows C.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

  According to the fuel injection valve 1 of the seventh embodiment, as shown in FIG. 12, in the portion where the adjacent liquid film jets 23 interfere with each other, the swirling directions of the liquid film jets 23 oppose each other as indicated by an arrow D. Therefore, atomization is promoted by the collision between the liquid film jets 23.

Embodiment 8 FIG.
FIG. 13 is a view of the injection hole 14 of the fuel injection valve 1 according to the eighth embodiment of the present invention as viewed from the downstream side of the fuel.
In the fuel injection valve 1 of this embodiment, there are four injection holes 4, and in three of these injection holes 4, the turning direction of the liquid film jet 23 is the direction indicated by the arrow D (clock), and the remaining one injection In the hole 4, the swirling direction of the liquid film jet 23 is a direction (counterclockwise) indicated by an arrow e.
Other configurations are the same as those of the fuel injection valve 1 of the seventh embodiment.

  According to the fuel injection valve 1 of this embodiment, the swirling direction of the interference part is the same between some liquid film jets 23. Here, in the part where the turning direction of the interference part is a radial direction when viewed from the valve seat central axis 12c, the liquid film jet 23 spreads 24 in the direction in which the liquid film jets merge due to the interference effect. A spray shape such as a flat spray can be freely formed.

Embodiment 9 FIG.
FIG. 14 is a view of the injection hole 14 of the fuel injection valve 1 according to Embodiment 9 of the present invention as viewed from the downstream side of the fuel.
In the fuel injection valve 1 according to the ninth embodiment, the four swirl chambers 19 each have the direction of the swirl flow 22 of the fuel adjacent to each other, one indicated by an arrow C (counterclockwise) and the other indicated by an arrow. Direction (clockwise), which are opposite to each other.
Other configurations are the same as those of the fuel injection valve 1 of the seventh embodiment.

According to the fuel injection valve 1 of this embodiment, since the spread 24 of the liquid film jet 23 in two directions is obtained as shown in FIG. 15, a flat collective spray shape can be obtained.
In general, since the shape of the intake pipe is a flat shape, the spray shape can also be flattened so that the spray can be spread and atomized while suppressing fuel adhesion, so that the combustibility is improved.

Embodiment 10 FIG.
FIG. 16 is an enlarged view showing the swirl chamber of the fuel injection valve according to the tenth embodiment of the present invention and its periphery, and FIG. 17 is a cross-sectional view showing the nozzle hole plate 13 along the line XVII-XVII in FIG. is there.
In the fuel injection valve 1 of the tenth embodiment, the radii of the liquid film jets 23 at the positions where the liquid film jets 23 injected conically from the two adjacent nozzle holes 14 are split in the circumferential direction are set to q1 and q2, respectively. In this case, the relationship between the distance N between the centers of two adjacent nozzle holes 14 is N <q1 + q2.
Other configurations are the same as those of the fuel injection valve 1 of the first embodiment.

  According to the fuel injection valve 1 of this embodiment, the adjacent liquid film jets 23 collide with each other before the liquid film jets 23 are split in the circumferential direction. The effect of atomization as in the fuel injection valve 1 is obtained, and the degree of freedom of the spray shape can be improved as in the fuel injection valves 1 in the eighth and ninth embodiments as long as the direction of rotation is opposite.

In the first to tenth embodiments, the case where the number of the swirl chambers 19 and the nozzle holes 14 is four has been described as an example. However, the number of swirl chambers and the nozzle holes is within a range not departing from the gist of the present invention. Even if the change is made, the same effect can be obtained.
In each of the embodiments, the common fuel introduction path 17 is provided on the upstream side of the first turning passage 18a and the second turning passage 18b in order to reduce the overall structure of the fuel passage and reduce the dead volume. When the number of swirl chambers is small and there is sufficient space for installing the fuel passage, or when the dead volume is small, the common fuel is not necessarily upstream of the first swirl passage 18a and the second swirl passage 18b. There is no need to provide the introduction path 17.

DESCRIPTION OF SYMBOLS 1 Fuel injection valve, 4 solenoid apparatus, 5 housing, 6 core, 7 coil, 8 amateur, 8a upper surface, 9 valve apparatus, 10 valve body, 11 valve main body, 12 valve seat, 12a valve seat sheet | seat part, 12b valve seat opening Part, 12c valve seat central axis, 13 injection hole plate, 14 injection hole, 14a injection hole center, 15 balls, 15a chamfering part, 16 compression spring, 17 common fuel introduction path, 18a first turning passage, 18b second Swivel passage, 18c 1st passage side wall, 18d 2nd passage side wall, 18e straight part, 19 swirl chamber, 19a swirl chamber side wall, 19c swirl chamber center, 21a, 21b main flow, 22 swirl flow, 23 liquid film jet, 24 spreading , L extension line, 30 intersection point, 40 tangent line, 50 convex part, 60 rod.

Claims (10)

A valve body that opens and closes the valve seat opening of the valve seat, and operates the valve body in response to an operation signal from a control device, so that fuel flows between the valve body and the valve seat sheet portion of the valve seat. A fuel injection valve that is injected toward the outside from an injection hole formed in an injection hole plate attached to a distal end surface on the downstream side of the valve seat,
The upstream end face of the nozzle hole plate is
A swirl chamber formed outside the valve seat opening in the radial direction, the swirl chamber having a space in which the nozzle hole is opened and the fuel is swirled continuously over the entire circumference of the nozzle hole;
The upstream end communicates with the valve seat opening, and the downstream end extends from the circumferential direction around the valve seat central axis, which is the central axis of the valve seat, to the nozzle hole center, which is the center of the nozzle hole. A first swirl passage for introducing the fuel into the swirl chamber region on the side close to the valve seat central axis side;
The upstream end communicates with the valve seat opening, and the downstream end pivots away from the valve seat central axis with respect to the nozzle hole center from a circumferential direction centering on the valve seat central axis. A second turning passage for introducing the fuel from a direction opposite to the direction of the fuel flowing through the first turning passage in a region of the chamber ;
A fuel injection valve in which a passage length of the first turning passage is longer than a passage length of the second turning passage .   An extension line that is a tangent to the first passage side wall at the downstream end of the first turning passage and that is away from the valve seat central axis extends toward the valve seat central axis. Item 4. The fuel injection valve according to Item 1.   The fuel injection valve according to claim 2, wherein an angle formed by a tangent to the swirl chamber side wall at an intersection of the extension line and a swirl chamber side wall of the swirl chamber is 90 ° or less.   The relation La> r-ha is established, where La is the shortest distance from the nozzle hole center to the extension line, r is the radius of the swirl chamber, and ha is the width of the first swirl passage. Or the fuel injection valve of 3.   The said nozzle hole is formed in the site | part shifted in the direction away from the said extension line with respect to the center of the swirl chamber which is the center of the said swirl chamber. Fuel injection valve. A valve body that opens and closes the valve seat opening of the valve seat, and operates the valve body in response to an operation signal from a control device, so that fuel flows between the valve body and the valve seat sheet portion of the valve seat. A fuel injection valve that is injected toward the outside from an injection hole formed in an injection hole plate attached to a distal end surface on the downstream side of the valve seat,
The upstream end face of the nozzle hole plate is
A swirl chamber formed outside the valve seat opening in the radial direction, the swirl chamber having a space in which the nozzle hole is opened and the fuel is swirled continuously over the entire circumference of the nozzle hole;
The upstream end communicates with the valve seat opening, and the downstream end extends from the circumferential direction around the valve seat central axis, which is the central axis of the valve seat, to the nozzle hole center, which is the center of the nozzle hole. A first swirl passage for introducing the fuel into the swirl chamber region on the side close to the valve seat central axis side;
The upstream end communicates with the valve seat opening, and the downstream end pivots away from the valve seat central axis with respect to the nozzle hole center from a circumferential direction centering on the valve seat central axis. A second turning passage for introducing the fuel from a direction opposite to the direction of the fuel flowing through the first turning passage in a region of the chamber;
A taper in which the amount of protrusion toward the valve seat central axis increases toward the downstream is formed on the first passage side wall at the downstream end of the first turning passage and away from the valve seat central shaft. fuel injection valve Jo of protrusions that provided. The injection hole plate has a plurality of the swirling chamber, the fuel according to any one of claims 1-6 turning direction of the liquid film jet injected in a conical shape from each of said injection hole is the same Injection valve. The nozzle hole plate has a plurality of swirl chambers, and at least one of the swirl directions of the liquid film jet ejected in a conical shape from each of the nozzle holes has a swirl direction of the other liquid film jet. The fuel injection valve according to any one of claims 1 to 6 , wherein the fuel injection valve is opposite to a turning direction of the film jet. The fuel injection valve according to claim 8 , wherein the nozzle hole plate has four swirl chambers, and swirling directions of the adjacent liquid film jets are opposite to each other. The fuel injection valve according to any one of claims 1 to 9 , wherein the first turning passage and the second turning passage are connected to a common fuel introduction path communicating with the valve seat opening upstream. .

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