WO2006025114A1

WO2006025114A1 - Fuel injection valve

Info

Publication number: WO2006025114A1
Application number: PCT/JP2004/013006
Authority: WO
Inventors: Motoyuki Abe; Yoshio Okamoto; Noriyuki Maekawa; Eiji Ishii; Toru Ishikawa; Yuzo Kadomukai; Masanori Mifuji
Original assignee: Hitachi, Ltd.
Priority date: 2004-09-01
Filing date: 2004-09-01
Publication date: 2006-03-09
Also published as: JPWO2006025114A1

Abstract

A fuel injection valve having excellent atomizing performance and capable of adjusting spray pattern to match various types of engine systems. The fuel injection valve comprises a valve element openable to start and stop the injection of a fuel and a valve seat brought into contact with the valve element to stop the injection of the fuel. A plurality of injection holes for injecting the fuel are formed on the downstream side of the valve element and the valve seat. A turning force adding means adding a turning force to the fuel is installed in a fuel passage starting at the valve seat to the injection holes. The plurality of injection holes are disposed so that a plane having the injection holes is formed of a coarsely disposed portion and a densely disposed portion.

Description

Fuel injection valve

Technical field

The present invention relates to a fuel injection valve used in an internal combustion engine.

Background art

A technique for promoting the atomization of fuel by a fuel injection valve is disclosed in

This is disclosed in Japanese Laid-Open Patent Publication No. 0 2-9 8 0 28 and Japanese Unexamined Patent Publication No. 2 0 3-3 3 6 5 6 1. With these technologies, the downstream of the disc and valve seat

A plurality of fuel passages branched in the lateral direction (radial direction) are provided on the side and swirl chambers (swirl chamber vortex flow) at the downstream end of each fuel passage.

) And the injection hole, this fuel path is offset against the swirling ^, and a swirling flow is generated inside the swirling chamber and the injection hole and flows out of the injection hole. Fuel to form a liquid

Disclosure of the invention

From the viewpoint of atomization of the fuel by the fuel injection valve with swirling, the energy given as the fuel pressure

However, as much as possible, it should contribute to atomization. BX metering is necessary. The atomization energy is given as the flow velocity at the stage of splitting, so the flow velocity in the injection hole It is necessary to crawl. In the prior art, a swirl chamber is provided downstream of the valve body and valve seat as a means to improve atomization performance. The distribution it is not enough.

Also, in the conventional technique V, there is no disclosure about a means for m mist shape. Providing a swirl chamber for multiple injection holes increases the volume of the fuel path downstream from the valve seat (added, volume), and continues injection even after closing <period The question is that will increase In the conventional technology, which may cause a problem, «The arrangement of injection holes and fuel passages that suppress the increase in V and pom while keeping the fog shape is not disclosed.

In particular, in-cylinder direct injection type gaso-V engine (hereinafter referred to as in-cylinder injection engine) aiming at low fuel consumption and high output, it depends on the combustion method, combustion shape, size of combustion method, etc. In other words, the fuel spray formed in the shape of each week is required-in the case of the in-cylinder injection engine, the time from fuel injection to ignition is short < Therefore, since the time for the fuel to evaporate is short, atomization of the fuel is required to obtain a larger surface area and promote evaporation for the same amount of fuel. Have

Spray shape and atomization of fuel affect the amount of unburned fuel component (hereinafter referred to as HC) and oxide (hereinafter referred to as NO) in the exhaust gas of the engine and fuel consumption.

For example, depending on the shape of the mist and the roughness of the fuel droplets, it adheres to the inner wall of the cylinder and the crown of the piston, and the attached fuel does not evaporate. Will be discharged without burning, substituting fuel consumption and increasing Hc

In the five operating states in which injection is performed during the intake stroke, there is a possibility of interference between the intake valve that is in the open state and the spray. One of the fuel adhering to the intake valve Since the part does not flow into the combustion chamber, the accuracy of air-fuel ratio control within the combustion may be impaired. If air-fuel ratio control is not performed accurately, the acid * concentration concentration in the exhaust system Due to the feedback control from the sensor, etc., the injection command value given to the fuel injection valve is too large, resulting in an increase in HC emissions. There are things. In addition, if the fuel injection valve is placed in the center of the combustion chamber, the positional relationship between the injection and the ignition plug, and the ignition plug where the atomization of the fuel is important are important. Direct liquid fuel or coarse fuel droplets can cause a fire plug to be struck.

Therefore, in order to improve the fuel efficiency and exhaust performance of the in-cylinder injection engine, it is important to improve atomization characteristics and control the shape of the spray.

The present invention has been made in view of the above-mentioned section.It is possible to improve the atomization performance by the fuel injection valve and to adjust the fog shape so that the engine can be adjusted. The aim is to provide a fuel injection valve that achieves the desired spray.

In order to achieve the above object, the fuel injection valve of the present invention is provided with a turning force applying means for applying a turning force to the fuel in a fuel passage extending from a valve seat of the fuel injection valve to a plurality of injection holes, The multiple injection holes have the injection holes, and the arrangement of the sparsely arranged parts and the densely arranged parts make it possible to adjust the spray shape.

In addition, one of the <i> turning force applying means <1> provides a turning force different from other turning force applying means, and allows adjustment of the shape of the mist.

, '-For atomization, the sum of the portions where the cross-sectional area of the fuel passage through which the turning force applying means and the valve seat are passed is the sum of the cross-sectional areas of the injection holes. By being characterized by its large size, the flow velocity at the injection hole is increased and the atomization performance is improved.

According to the present invention, the fuel injection valve having a plurality of injection holes is swung to fuel flowing out from each injection hole to promote atomization and to arrange the injection holes. In-cylinder injection A fuel injection valve is provided to obtain a spray with a shape suitable for an engine.

In addition, a fuel injection valve that can achieve the above effect while suppressing the increase in the volume and volume that are generated when swirling is assigned to multiple injection holes. Supply

Brief Description of Drawings

FIG. 1 is a sectional view showing the construction of a first embodiment of a fuel injection valve according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the vicinity of the p-type injection hole and a cross-sectional view of the fuel passage play of the first embodiment of the fuel injection valve according to the present invention.

Figure 3 shows the injection formula of the fuel B injection valve in one example.

The first fact

Fig. 4 is a schematic diagram showing an example in which the fuel injection valve of the first embodiment is mounted on an internal combustion engine.-Fig. 5 shows the vicinity of the injection hole of the fuel injection valve of the first embodiment according to the present invention. Fig. 2 is an enlarged cross-sectional view and a cross-sectional view of a fuel passage play.

Fig. 6 is a schematic diagram of spraying by the fuel spray valve of the first example.

FIG. 7 is a schematic diagram showing an example in which the fuel injection valve of the first embodiment is mounted on an internal combustion engine.

Two

FIG. 8 is an enlarged cross-sectional view of the vicinity of the injection hole of the fuel injection valve according to the first embodiment of the present invention and a cross-sectional view of the fuel passage plate.

Fig. 9 is a schematic diagram showing an example of spray shape and an example in which the fuel U noble valve of the second embodiment is placed in the center of combustion.

FIG. 10 is an enlarged cross-sectional view of the vicinity of the injection hole of the fuel injection valve of the fourth embodiment and a cross-sectional view of the fuel passage press. 11 Fig. 1 is a schematic diagram showing the shape of the spray formed by the fuel injection valve of the fourth embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

[Example 1]

FIG. 1 is a cross-sectional view showing a first embodiment of the fuel injection valve according to the present invention. The fuel injection valve shown in FIG. 1 is a normally closed type magnetic fuel U injection valve. In the state where it is not passed through the filter 1 1 2, the valve body 1 1 0 and the valve seat 1 0 4 are in close contact with each other, and no fuel is shot. Supplyed by fuel supply P with pressure applied to fuel pump, fuel inlet 1 1

5 through the coil 1 1 2 filled with fuel up to the contact position between the valve body 1 1 0 and the valve seat 10 4, and is supported by the valve body gear 10 3. The valve body 1 1 0 is displaced upward in FIG.

1 0 is away from valve seat 1 0 4 ヽ Fuel is valve seat 1 0 4 and disc 1 1

A number of injection holes (e.g. injection holes) downstream through a gap of 0

1 0 1)

Fig. 2 is a cross-sectional view enlarging the vicinity of the injection hole 10 1 and the valve seat 10 4. The A-A cross-sectional view shows the fuel passage block in which the lateral path for the injection hole is formed. The fuel is a valve body 1

After passing through 10 and the valve seat 10 4, it flows into the lateral passage 20 4, and turns the swirl passage, which is the fuel passage of the plurality of spray holes, into the M chamber, and the swivel force by swiveling After being applied, it is injected from each injection hole. For example, for the injection hole 10 1, the fuel flowing in from the turning passage 2 07 is given a turning force in the direction of the arrow 2 1 1 by the turning 2 0 8, and the fuel is injected into the injection hole 1 0 1. Outflow. Since the swirl passage 20 07 is offset from the center of the substantially circular swirl chamber 20 8, A swirling flow in the direction of arrow 2 1 1 occurs in the swirling chamber.

In this way, if the swirl force is generated in the injection hole and the flow upstream of the injection hole is formed, the injected fuel is split from the conical liquid film. The fuel can be broken into smaller droplets compared to the case without swirling force.

The plurality of injection holes are arranged so that the injection holes have a densely arranged part and a sparsely arranged part in the AA cross section. In the vicinity of 1, 2 009 a and 2 0 9 b ′, the number of injection holes per unit area is small, and the distance from the nearby P noble holes is long and sparse Also, in the vicinity of the injection holes 205 and 206, the number of injection holes for the unit face mussel 7 is large, and the distance from the adjacent injection holes is short, a dense arrangement. In

Also, each injection hole is installed so that the angle with respect to the valve body O-axis 210 is different so as to avoid the BB disconnection in Fig. 2.

In the example shown in Fig. 2, the injection hole 20 5 is provided with a tilt angle, whereas the injection hole 10 5 is provided substantially parallel to the valve body axis.

Further, the injection hole 10 1 and the injection hole 2 0 5 flow into the injection hole 1 0 1 provided with the winding passage and the swirl chamber so that the swirl force applied to the fuel is different. For swirl 20 8, the offset is small relative to the center of the swirl chamber 20 8, which is small in the center of the swirl chamber 20 8. By doing

Therefore, the angular momentum of the fuel applied to swirl 20 8 decreases, and the swirl force of the fuel flowing out from the spray hole 10 1 becomes smaller. The swirl chamber 2 1 2 is a swivel rod 2

1 Rotating passage 2 1 3 connected to the center of 2 The amount of angular movement given to the fuel flowing out from the injection hole 20 6 increases when the offset to the center of the swirl chamber 2 1 2 is V, which is large. The swivel force to the injection hole cannot be adjusted according to the offset amount with respect to the swivel center.The swivel force depends on the amount of angular movement given in the swirl chamber and the axial direction flowing out of the spray hole. Because it is determined by the ratio to the amount of movement, the turning force can be adjusted according to the size of the injection hole, the cross-sectional area of the turning passage, and the size of the turning chamber.

Also remove the density of the hole

Sparsely arranged injection holes 1 0 1 2 0 9 a 2 0 9 b is close to the central axis of the valve body, and m injection holes 20 6 are densely arranged The dense arrangement of the injection holes so that it is <from the center axis of the body means that there is a flow path for forming a swirl flow upstream of the injection holes. It's not just a simple hole arrangement.

In order to close the U injection hole, it is necessary to place it away from the center axis of the valve body due to geometrical restrictions. Since the flow rate is also large, it is necessary to design the fuel passage so that the cross-sectional area of the part flowing into the turning passage from the lateral passage 2 0 4 force is not too small <densely In order to secure the cross-sectional area of the part where the swirling passage that flows into the injection hole and the lateral passage 20 4 are connected, the part where the lateral passage 20 04 and the turning passage are connected Must be provided at a position away from the center of the disc

In the example shown in Fig. 2, the swirl passage 2 1 3 connected to the injection hole 20 6 arranged at is connected to the lateral position at one position from the center of the valve body.

Provided in 5

On the contrary, the swirl passage and the lateral passage flowing into the sparsely arranged injection holes The part where the road 2 0 4 is connected is closer to the valve body, and the swirl passage that becomes the sparsely arranged injection hole 1 0 1 is located closer to the center of the valve body. In this way, it is connected to the lateral passage 20 4

In this way, the volume of the lateral passage 20 4 can be reduced, and the volume downstream of the valve seat 10 4 can be reduced. Of the fuel remaining in the fuel passage after

Depending on the pressure fluctuation after closing, etc.-The amount of secondary injection that occurs The primary injection is related to deposits adhering to the fuel injection valve, etc. Therefore, it is better to reduce the volume, and to reduce the primary injection, the volume downstream of the valve seat should be small.

Therefore, it is possible to provide a sparse part and a dense part in the arrangement of the injection holes, and to provide a set of injection holes with different angles of the injection holes. Therefore, the spray shape can be adjusted to 5 so that it matches the combustion septum and the combustion shape.

The fuel path plate 20 2 is punched by punching, cutting force, V shear force discharge X, discharge X at electrode,

>-Manufactured by processing with a matching process V Fuel port plate 20 2 is formed by a switching port In this case, if the material of the fuel passage plate is a single crystal silicon, addition X is easy.

In addition, the fuel passage plate 20 2 and the injection hole plate 20 3 can be easily positioned by using a pin 2 1 4 as shown in FIG. 14 is provided as a separate member, but it may be integrated with the B nose hole plate 20 3 or the fuel passage plate 20 2 or the fuel passage plate Lay-up 2 0 2 and spray hole play

20 3 can be manufactured as an integral part. And the injection hole press プ as a body, the positioning of the injection hole and the swirl on the fuel path plate is not necessary, and the manufacturing cost is reduced, and it is an integrated member. When manufacturing fuel path plate and injection hole plate, cutting process by plastic punch, plastic process, discharge process by electrode, or V chain After the fuel passage and swirl passage are formed by the process, the injection hole is cut.

(KV), it is better to punch with a punch discharge etc.

FIG. 3 is a view showing a spray atom injected from the example of the fuel injection valve shown in FIG. Since the injection hole 10 1 is inclined with respect to the shaft of the valve body, the fuel spray injected from the U injection hole 10 1 is inclined. Since the turning force applied to 10 1 is small, the spread of the spray 30 2 becomes small and the axial power of the injection hole does not increase with respect to the angular movement. Therefore,

The soil

The spray is more m. <On the other hand, the injection hole 205 is provided with no inclination, so that the spray 3 0 1 injected from the injection hole 2 0 5 force It flows out almost without inclining, and the injection hole 2

Since the turning force applied to 0 5 is large, the spread of spray 3 0 1 is less than that of spray 3 0 2 and the reach is shorter

Cross section E-E is a cross-sectional view of the spray. Spray 3 0 2 has a small spray spread, so the spatial distribution of the fog is likely to become dense. Since the spread of the mist is large, the mist distribution is sparse, so that the mist 30 4 and the mist 3 0 3 are separated from the other injection holes (for example, the U injection holes 2 0 6 and 2 0 9 a etc.) The angle of the husband's injection hole formed by the fuel injected from the fuel is adjusted and the swirl force is adjusted.

The jets shown in Fig. 3 are the same as those shown in Fig. 5. It is good to use for. Fig. 4 is a cross-sectional view of an in-cylinder injection engine. The engine shown in Fig. 4 is a suction engine with the fuel injection valve located near the intake port and the ignition plug located in the center of the fuel. It is a valve-type engine, and it is an engine of a combustion concept that employs a method of injecting fuel to the intake.

When fuel is injected during the intake stroke, the intake valve 4 0 4 is open

·-Inject fuel with. At this time, the air flow from the suction and the point is generally strong toward the piston 4 0 7 as indicated by the arrow 4 0 6.

'When I grow up, I'll know

Since the fuel is injected with the intake valve 40 4 open, the spray from the fuel injection valve 40 1 that has been exhausted collides with the intake valve 4 0 4. In this case, the fuel spray valve 41 is applied with the spray shown in Fig. 3, and the mist 3 0 2 is directed in the direction of the ignition plug 40 3. When installed, the position of the fuel-lean ¹ part 3 0 5 in Fig. 3 exactly corresponds to the position of the intake valve 4 0 4 J

Therefore, the fuel adhering to the intake valve 40 4 that impinges on the intake valve 40 4 and suppresses the adhering fuel may impair the accuracy of control of the air-fuel ratio. However, the fuel injection valve according to the present invention as shown in FIG. 3 can be a cause of increasing the unburned fuel component in the exhaust gas.

Use-to avoid this problem

Also, the spray 30 2 shown in Fig. 3 has a narrow spray spread <and a high spatial density of fuel droplets. For this reason, it is possible to make the mixing state of the fuel and the air more uniform. As a result, it is possible to reduce the density of the mixture during combustion.

-Oxidation that occurs at high temperatures. Do

In addition, the mist 30 1 in Fig. 3 has a large spray spread and a short distance, so the spray is pistoned by the suction flow 40 6.

Piston 4 expected to have an effect of suppressing adhesion to 4 7

The fuel adhering to the crown of 07 may be discharged as an unburned fuel component during combustion due to the quenching effect of cooling on the piston surface, as shown in Fig. 3. This problem can be avoided by using a simple fuel injection valve.

[Example 2]

FIG. 5 is an example in which the injection holes are arranged in an oval shape as the first embodiment according to the present invention. In the case of the injection hole arrangement shown in FIG.

Fig. 6 G-G cross section of line 5: A line that gives a flat spray shape 50

7 No. 50 06 is an orthogonal line, but the number of spray holes arranged in the clockwise direction from line 50 06 to line 50 07 is the central axis of the disc

The number of injection holes arranged in the counterclockwise direction from line 5 06 to line 5 0 7 by two pieces (for example, injection hole 50 2) sandwiching 50 8 The number should be 4 each with the valve body central axis 50 8 in between (for example, X. Injection hole 5 0 1), that is, focus on the density in the circumferential direction around the valve body axis of the fuel injection valve. Then, the vicinity of the injection hole 50 2 is a sparse arrangement, and the vicinity of the injection hole 50 1 is a dense arrangement.

The spray holes are arranged in an ellipse shape. The reason is that the injection holes are located farther away from the central axis of the valve body 5 8 when the injection holes are dense, and closer when the injection holes are sparse. >-As a result of the arrangement, the cross-sectional area of. Is secured at the site where the swirling passage and the transverse passage 50 4 that flow into the densely arranged injection holes are formed. Along with taking off, increase the size of the doll and box.

· It is possible to mix sparse firing hole arrangements if-<is less. In addition, as shown in the FF cross section of Fig. 6, the angle of the injection holes is different, and the injection holes arranged on the outside (for example, the injection holes 5

0 1) Inclined toward the outside of the valve body central axis. Due to this inclination, the cross section of the fog is flat as shown in the G 1 G cross section.

The spray shown in Fig. 6 is effective when used in 5 engines as shown in Fig. 7. Fig. 7 shows that the fuel is injected during the compression stroke and the fuel is rich in the combustion. Figure 5 and Figure 6 show the fuel injection valve 701, which is an example of a cylinder-injection gasoline engine with a stratified combustion that forms a thin part and ignites. The fuel spray valve is used, the spray shape is a flat shape, the spray 70 6 is inclined with respect to the mounting angle of the fuel injector 70 1, and the ignition The direction of plug 70 3 towards Layo 5 is

This is because of the C-C cross section of 5. Fig. Ί

In this way, by providing the inclination of the injection hole, the direction in which the spray is formed can be adjusted without being restricted by the mounting angle of the fuel injection valve.

As shown in Fig. 5, the spray droplets from the fuel injection valve with a plurality of injection holes, each of which has a flow path that imparts a turning force, are small and non-suspended. Decrease with gas. For this reason, when compression stroke injection as shown in Fig. 7 is used for the engine 5, the spray arrival distance is shortened, resulting in the vicinity of the ignition plug 70 3. If the fuel droplets <<the mixture of the generated fuel and gas stays longer, the combustion stability is improved, and the combustion stability is improved. The degree of freedom in setting the firing rate and ring is improved, and more efficient thermal efficiency can be achieved. It is possible to fire. As a result, the thermal efficiency of the engine is improved and the fuel consumption is reduced. "Also, when these 5 engines are installed in a car, the stratification i is applied over a wide range of engine loads and speeds for high combustion stability. It is possible to reduce fuel consumption.

-On the other hand, the flattened spray reduces the collision between fuel and piston 70 7 and reduces the unburned fuel component in the compression stroke. Fuel injection valve 7 for fuel injection

The distance between 0 1 and 70 7 of the piston is short, and the piston approaches as time passes after injection, so there is less fuel in the direction of the piston 70 7 Good power ^ good

In general in-cylinder injection gasoline engines, in order to ensure combustion stability, fuel is collided with pistons to introduce ignition plug mixing. If a fuel injection valve as shown in Fig. 5 is used, combustion stability can be improved while avoiding fuel collision with the piston.

[Example 3]

FIG. 8 is a cross-sectional view showing a third embodiment according to the present invention in which injection holes having dense injection holes are arranged in the portion.

The injection holes 8 0 1 a to 8 0 1 are arranged uniformly in the circumferential direction of the valve body central axis, and the inclination thereof is determined so as to face the outside of the valve body central axis. On the other hand, the angle of the injection hole is set so that the injection holes 802a, b, face the inside of the valve body.

It is different from 0 1 a-8 0 1 g, and the injection hole 8 0 2 a is located close to the adjacent injection hole compared to the injection hole 8 0 1 a-8 0 1 g. It is a close distribution. Positive flow for this injection hole arrangement

In order to supply to the injection hole 8 0 2 a, the injection hole 8 is positioned away from the central axis of the valve body.

0 2 a is provided, and the position where the turning passage 8 0 6 and the lateral passage 8 0 4 that become the spray hole 80 2 a are connected from the central axis of the valve body

5 Rotating passageway from lateral passage 804 by being provided apart

Securing the cross-sectional area at the site flowing into 8 0 6, and ensuring the appropriate flow Λ 8 0

2 a κ is ready to be supplied

On the other hand, it is better to provide 5 injection holes instead of separating the injection holes 8 0 1 a-8 0 1 g from the central axis of the valve body.

• The position where the swirling passage (for example, swirling passage 8 0 7) and the lateral passage 8 0 4 connected to the 0 injection holes 8 0 1 a to 8 0 1 g, respectively, is When the volume of the lateral passage 8 0 4 is increased as a result of the inclusion of the force S and the proximity to the valve body central axis as compared to the turning passage 8 0 6 connected to the hole 80 2 a N <, ie end, increase volume

.5 and <The spray shape can be adjusted.

In addition, the angle of inclination of the injection hole is 8 0 1 a-8 0 1 g and 8

0 2 Different between a and b ヽ c-makes spray shape control easier

The fuel injection valve shown in Fig. 8 should be used for engine 0 as shown in Fig. 9. Fig. 9 shows that the fuel injection valve is located in the vicinity of the center of combustion. > ·

An engine with an arrangement such as the example of an arranged gin mainly improves combustion stability and expands the range of conditions under which stratified combustion is possible, reducing fuel consumption and combustible. Nitrogen oxidation with a homogeneity level in the region of the air-fuel mixture that has an air-fuel ratio

> 5 There is an aim to reduce exhaust such as things.

When the fuel injection valve is placed in the center of the combustion chamber as shown in Fig. The distance between the ignition plug 90 3 and the fuel injection valve 90 2 is shorter <The position where the ignition plug 90 3 is placed should be close to the center of combustion to shorten the flame propagation time during ignition. Is desirable. However, if the distance between the ignition plug and the fuel injection valve is too close, the fuel injected from the fuel injection valve will collide with the fire plug due to the liquid, and the ignition plug will become dirty. If fuel is injected in a direction different from the ignition plug due to a change in the fuel injection direction, etc., an air-fuel mixture is formed in the vicinity of the ignition plug. It becomes difficult, and it is difficult to secure the flame stability.

The fuel injection valve according to the present invention enables spraying as shown in the section JJ in FIG. S1. It is possible to form a nearly uniform mist 90 1 and a part 90 4 where almost no fuel is distributed.

As a result, there is a portion where almost no fuel is distributed in the ra, so that it is possible to form a mixture near the ignition plug while preventing the ignition plug from being contaminated. Can improve combustion stability.

Such a spray can be realized by the embodiment of the present invention shown in FIG. In the region 90 4 where the spray distribution is small, the direction of the injection holes 8 0 2 a b and c is directed toward the center of the valve body,

8 0 1 a through 8 0 1 g

As a result, the injection holes 80 1 a to 8 0 1 g form only the outer edge of the spray, but the center of the fog is formed by the injection holes 8 0 2 a, b, and C. In the region 90 4 where the fuel is distributed in the vicinity and the component force S of m is small, the spray power 1¾ is <

Ninth J-J forms a mist as shown in section J. The fuel injection valve is arranged near the center of the combustion chamber according to the embodiment shown in Fig. 8. Fuel injection valve that forms an appropriate shape for the engine

As a result of the supply of-, it is possible to increase the combustion stability of the engine, reduce fuel consumption, and reduce exhaust emissions.

[Example 4]

In the fourth embodiment, the five fuel injection valves shown in the third embodiment are arranged in a simple manner in the form of an engine that is arranged in the center of the combustion chamber.

■ An example of the injection hole arrangement included in

FIG. 10 is a cross-sectional view showing the arrangement of the injection holes when three injection holes are formed. The fuel passage 100, the swirl passage 100, and the injection holes 1003 are respectively injection holes. In the case where the number of injection holes is reduced as shown in FIG.

Compared to the case shown in Fig. 3, the flow rate of the fuel sprayed from each injection hole needs to be large, so the cross-sectional area of each injection hole is sufficiently large.

In addition, since the cross-sectional area of the fuel passage and the swirling passage leading to the injection hole must be sufficiently large, the figure 5 in Figure 10-for one injection hole If there are multiple swirling passages, for example, in FIG. 10, swirling passages 1 0 0 6 and 1 0 0 5 are provided for the injection holes 1 ◦ 0 3. In addition, by providing multiple swirl passages for one injection hole, the fuel passage 1 0 0 2 is enlarged.

·-The cross-sectional area at the position where the swirl passage and the fuel passage 1 0 0 2 are connected to each other can be made larger. Can suppress the increase in um

There are five such injection holes in three fields, and it is good to have a dense arrangement of the injection holes. In FIG. 10, it is adjacent to the injection hole 100 3. N 0 injection holes 1 0 0 7 a and 1 0 0 7 b are separated by the angle shown in the circumferential direction 1 0 10 0 a and 1 0 10 0 b, and the injection hole 1 0 0 7 a on the side, the angle between the adjacent hole and the circumferential direction 1 0

1 0 a, 1 0 10 0 c apart, circumferential angle 1 0 10 0 c is greater than 1 0 1 0 a and 1 0 1 0 b

1 0 0 • 7 a No 1 0 0 7 b injection holes are sparsely located compared to ヽ injection holes 1 0 0 3

In this way, it is possible to increase the degree of whiteness of the arrangement of the rotating passages that lead to the injection holes by providing the injection holes with the density of the injection holes. 7 a 1 0 0 7 b is provided with two swirl paths, but in either case, the swirl path may be within the range of the circumferential angle of 1 0 1 0 c. As a result, a swirl passage is provided in the circumferential angle range of 10 100, so that the fuel passage 100 0 2 and the swirl passage are connected to each other. As a result of increasing the cross-sectional area, the side of the fuel passage 100 0 2 that is not connected to the swirl passage can be reduced. The volume of the fuel passage 1002 is small, and as a result, the de K volume can be reduced.

In addition, when the injection holes are sparsely arranged, the sparse injection holes are close to the center axis of the valve body and the dense injection holes are arranged away from the central axis of the valve body.

-With the arrangement of 5 so that the injection holes 1 0 0 7 a and 1 0 0 7 b are provided close to the fuel passage 1 0 0 2 While being suppressed, it is possible to connect two swirl passages to each of the injection holes 1007a and 1007b.

Since 1 0 0 7 a and 1 0 0 7 b are sparsely arranged, the circumferential angle 1 0 1 0 c is wide <and the degree of freedom in the arrangement of the swivel path is high < Thus, the injection hole can be brought closer to the central axis of the valve body while maintaining a sufficient run-up distance in the swivel path.

On the other hand, since the densely arranged injection holes 1003 are arranged away from the central axis of the valve body, the lengths of the swirl passages 1006, 1005 are reduced. It is possible to provide sufficient swirling force to the fuel injected into the injection hole 10 0 3 while providing a sufficient flow rate.

The soot mist obtained by such an arrangement of the injection holes has the five shapes shown in 11.1 o Each of the injection holes has a substantially conical P mist.

(Example 7L is an injection 1 1 0 1), and these sprays have three circular shapes when viewed on the PP cross section.

As shown in Fig. 9, the angle of the injection holes 1 0 0 7 .a and 1 0 0 7 b in Fig. 10 is set to HX so that 0 2 is generated. The fuel injection valve can be applied to the engine located in the center of the combustion chamber.In other words, the presence of the sparsely sprayed part 1 1 0 2 causes the ignition plug to become wet. It makes it easier to avoid hitting.

Therefore, even when the number of the fine holes shown in Fig. 10 and Fig. 11 is as small as three, it is suitable for the engine by using the present invention. It is possible to form a squirrel jet.

Claims

The scope of the claims

1. Valve body that can be opened and closed to inject and stop fuel injection, and valve seat that can stop fuel injection by contacting the valve body

In a fuel spray valve provided with a plurality of injection holes for injecting fuel downstream of the valve body and the valve seat,

A turning force applying means for applying a turning force to the fuel is provided in the fuel passage from the valve seat to the injection hole,

The fuel injection valve is characterized in that the plurality of injection holes have a portion arranged sparsely in a plane having the injection holes and a portion arranged densely

2. A valve body that can be opened and closed for fuel injection and injection stop, and a valve seat that can contact the valve body to stop fuel spraying are provided. A fuel injection valve having a plurality of injection holes for injecting fuel downstream of the body and the valve seat;

A fuel injection valve characterized in that at least one of the turning force applying means is provided so as to apply a turning force different from the other turning force applying means.

3. The fuel injection valve according to claim 1, wherein the densely arranged injection holes are smaller in axial force and distance in the valve body than the sparsely arranged injection holes. A fuel injection valve characterized by being arranged at a distant position.

4. The fuel injection valve according to any one of claims 1 to 3, wherein the total sum of the minimum cross-sectional area of the fuel passage connecting the turning force applying means and the valve seat is: From the total cross-sectional area of the recording hole A fuel injection valve characterized by its large size.