JP2002202031A - Fuel injection valve and fuel injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a sticking quantity of spray to an inner wall surface of an intake pipe by realizing two-directional atomization of high atomization fuel in a port injection type internal combustion engine. SOLUTION: A spray generating means is constituted by laminating a fuel-in plate 13 for constituting a fuel passage, a swirl plate 14 for constituting the fuel passage for imparting turning force to fuel, and an injection plate 15 for determining the injection direction of the fuel to obtain two-directional spray for enhancing atomization. Penetrating force of the respective sprays injected in two directions is made different.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve, and more particularly to a technique for atomizing fuel and controlling the injection direction.

[0002]

2. Description of the Related Art In order to cope with the improvement of fuel efficiency and exhaust gas purification of an internal combustion engine, it is important to promote atomization of fuel injected from a fuel injection valve and to accurately control an injection direction. JP-A-61-234266 discloses a first main intake passage opened to one combustion chamber of an engine and opened and closed by a first intake valve and a second main intake passage opened and closed by a second intake valve. An on-off valve disposed in the main intake passage, closed at a low load and opened at a high load, and branched from a main intake passage upstream of the on-off valve and having an outlet end at a first end. An auxiliary intake passage that is open to the first main intake passage near the intake valve and has a passage area smaller than that of the main intake passage; and an auxiliary intake passage that is disposed downstream of the on-off valve in the main intake passage. A fuel injection valve having an injection path of the first injection hole directed to the first intake valve and an injection path of the second injection hole directed to the second intake valve. ing. Further, in this publication, the diffusion angle of the injection path in the second injection hole is set to be smaller than the diffusion angle of the injection path in the first injection hole, and the fuel injection amount from the first injection hole is set to the second angle.
It is described that the fuel injection amount is made larger than the injection amount from the injection hole. Further, in this fuel injection valve, the opening areas of both injection holes are made different in order to make the fuel injection amounts from both injection holes different. JP-A-8-218986 discloses a fuel injection device having a fuel injection valve provided in an intake pipe upstream of an intake valve of an internal combustion engine to inject fuel spray into the intake pipe. Has at least one curved semi-circular injection hole, and furthermore, the outermost peripheral portion of the spray collides within the range of a tangent connecting the wall surface of the intake port and the injection portion, and in the back of the intake valve. A configuration for disposing a fuel injection valve is described.

[0003]

In the above prior art, 1
Two fuel sprays are injected in two directions from one fuel injection valve so that one fuel spray is injected into each of two intake ports provided in one combustion chamber. There has not been sufficient consideration given to the atomization of. In the case of injecting fuel in two directions, the time required for each spray to reach the combustion chamber (hereinafter, referred to as “injection”) due to the bias of intake flow rate or flow resistance based on the structure and shape of the intake passage.
Transport time) is not always the same. Or 2
By trying to make the transport time the same between the two sprays, the structure and shape of the intake passage (intake pipe) may be restricted. In the above prior art, no consideration is given to a time delay (hereinafter, referred to as a transport delay) between the two sprays until the fuel reaches the combustion chamber. In the former of the above two publications, the diffusion angle of the spray is different between the first injection hole and the second injection hole, but no consideration is given to changing the penetration force (penetration) of each spray. The penetration force of the spray varies depending on the degree of atomization of the fuel constituting the spray, and the penetration force of the spray cannot be uniquely determined from the fuel injection amount or the initial speed of the injected fuel.

An object of the present invention is to improve atomization of fuel injected in two directions. Another object of the present invention is to
An object of the present invention is to eliminate a time delay between the two fuel sprays injected from the fuel injection valve and reaching the combustion chamber.

[0005]

In order to improve the atomization of fuel injected in two directions, a fuel injection valve and a fuel injection device having the following configuration are provided. A valve seat and a valve body provided so as to be able to contact and separate from the valve seat; two fuel injection holes provided downstream of the valve seat; and a fuel injection hole upstream of the fuel injection hole and downstream of the valve seat. A swivel force applying unit that is provided corresponding to the fuel injection hole and applies a swirl force to the fuel,
The fuel is injected from two fuel injection holes in two directions. At this time, the turning force applying means introduces fuel into the through-hole by directing a through-hole penetrating from the upstream end face to the downstream end face of the plate-shaped member in a direction offset with respect to the center of the through-hole. It is preferable that the plate-like member is provided on the upstream side of the fuel injection hole and has a fuel passage that is provided, and is provided in a plane direction of the plate-like member.
In addition, from the upstream end face to the downstream end face, it penetrates in directions different from each other, and is constituted by two through holes independently juxtaposed in the plane directions of the upstream end face and the downstream end face. A first plate-shaped member having two fuel injection holes, and two through-holes penetrating from the upstream end face to the downstream end face and independently juxtaposed in the plane directions of the upstream end face and the downstream end face, A second plate-shaped member having the two turning force imparting means, each of which is provided with a fuel passage provided in each through hole and communicating in a direction offset with respect to the center of the through hole. From the downstream side of the flow, in the order of the first plate-like member and the second plate-like member, each of the two through holes of the second plate-like member is connected to the second plate-like member. Each plate member is laminated so as to communicate with each of the two fuel injection holes Good. At this time, a third plate-shaped member having a passage wall surface forming a fuel passage communicating from the upstream end surface to the downstream end surface is provided, and on the downstream side of the valve seat,
From the downstream side, the third fuel passage communicates with the fuel passage of the second plate member in the order of the first plate member, the second plate member, and the third plate member. The plate members may be stacked such that each of the two through holes of the second plate member communicates with each of the two fuel injection holes of the first plate member. In each of the above-described configurations, the penetration force of the fuel spray injected from the two fuel injection holes may be made different by changing the turning force applied to the fuel between the two turning force applying units. .
It is possible to provide a structure of the fuel injection valve that can eliminate a time delay until the spray injected from the fuel injection valve reaches the combustion chamber. An intake pipe for supplying air to the internal combustion engine,
A fuel injection device comprising: an intake flow control device that controls a flow of air flowing through the intake pipe; and a fuel injection valve that injects fuel downstream of the intake flow control device in the intake pipe. The valve includes a valve seat, a valve body provided to be able to contact and separate from the valve seat, and a valve body provided downstream of the valve seat.
Two fuel injection holes, respectively provided on the upstream side of the fuel injection holes and on the downstream side of the valve seat corresponding to each fuel injection hole,
And a turning force applying means for applying a turning force to the fuel, wherein the fuel is injected from two fuel injection holes in two directions.
The following configuration is used as a fuel injection valve and a fuel injection device that can eliminate a time delay before reaching the combustion chamber between fuel sprays injected in two directions.
In a fuel injection valve, a valve seat, a valve body provided so as to be able to contact and separate from the valve seat, a fuel injection hole provided downstream of the valve seat to inject fuel in two directions, and a fuel injected in each direction. Means are provided for varying the penetration force between the sprays. An intake pipe for supplying air to the internal combustion engine; an intake flow control device for controlling a flow of air flowing through the intake pipe; and a fuel injection for injecting fuel downstream of the intake flow control device in the intake pipe. And a fuel injection valve for injecting fuel in two directions, and a means for causing penetration force to differ between fuel sprays injected in each direction. Further, it is preferable that the intake flow control device can change an air flow rate supplied to each of two fuel sprays injected in two directions from the fuel injection valve.
In addition, the rotation axis of the on-off valve of the intake air flow control device and the valve axis of the fuel injection valve are arranged in parallel, and the fuel injection valve has one of a boundary between a plane including the rotation axis and the valve axis. It is preferable that one fuel spray of the two fuel sprays is directed to the side, and the other fuel spray of the two fuel sprays is directed to the other side of the two fuel sprays with the surface as a boundary. . Further, as the means for making the penetration force different, the number of fuel injection fine holes for forming one fuel spray is
It is preferable to set a different number between the two fuel sprays so that the two fuel sprays have different penetration forces.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel injection valve and a fuel injection method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view showing a state in which an electromagnetic fuel injection valve according to an embodiment of the present invention is mounted on an intake pipe of a multi-cylinder internal combustion engine, and FIG. is there.
FIG. 2B is a diagram viewed from the S direction, showing the positional relationship between the intake valve and the electromagnetic fuel injection valve 1.

Reference numeral 101 denotes one cylinder of a multi-cylinder internal combustion engine, 102 denotes a combustion chamber, 103 denotes an intake port 104
, An intake passage 105 having a central partition wall 105a separating the intake port 104 and communicating on the upstream side, 106 an intake pipe, 107 an intake flow control device,
Numeral 8 denotes the flow of intake air, numeral 109 denotes an inner wall surface of the intake passage 105 facing the inner wall surface on the side of the electromagnetic fuel injection valve 1, and numeral 100a denotes a schematic diagram of spray injected from the electromagnetic fuel injection valve 1.

The intake flow control device 107 has an on-off valve 110 which is driven to rotate about a rotation shaft 110a. Two intake ports 104 are arranged in parallel with respect to one combustion chamber 102, and two sprays (two-way sprays) are respectively injected toward the center of each intake port 104. In the present embodiment, as a fuel injection method, a multipoint injection (MPI) system in which the electromagnetic fuel injection valves 1 are arranged one for each combustion chamber 102 on the upstream side of the intake valve 103 is adopted. I have.

The on-off valve 110 is substantially parallel to a plane including two central axes imaginary in the injection direction of the two sprays injected from the electromagnetic fuel injection valve 1 in the axial direction of the rotation shaft 110a, and The fuel injection valve 1 is configured so as to be substantially perpendicular to the direction of the valve shaft (or the valve axis or the central axis) that matches the driving direction of the valve element of the fuel injection valve 1.

In this embodiment, the case where there are two intake ports 104 is described.
Is also possible.

In order to improve the quality and the state of formation of the air-fuel mixture in the cylinder, the degree of atomization of the spray 100a is increased, but further, the adhesion of fuel to the intake pipe 106 and the inner wall surface of the intake passage 105 is reduced. Therefore, the direction and shape of the spray and the injection timing are optimized. As shown, the intake flow control device 107 generates a tumble flow by closing the passage area of the intake pipe 106 and increasing the speed of the intake flow when the intake flow control device is closed.

Each fuel spray injected from the electromagnetic fuel injection valve 1 is supplied to the intake valve 103 at such a narrow injection angle as to prevent the fuel spray from adhering to the intake pipe 106, the passage wall of the intake passage 105, and the central partition wall 105a. Plates 103a, 103b
Is generated to be oriented. That is, the spray 100a
Has a hollow cone shape (hollow cone shape) whose center portion is thin and its outer portion is dense, and is uniformly dispersed on the surface of the dish portion 103a of the intake valve 103. A so-called hollow cone-shaped two-way spray with good atomization is generated to suppress wall adhesion.

When a combustion test of an internal combustion engine was carried out, the exhaust gas performance and the fuel efficiency were improved, and the electromagnetic fuel injection valve 1 suppressed the adhesion of fuel to the inner wall surface of the intake pipe, and the mixture of It was confirmed that the quality and the state of formation could be improved.

FIG. 2 is a view showing a state in which the electromagnetic fuel injection valve of the present embodiment is mounted on an intake pipe of a multi-cylinder internal combustion engine of a different form.

Similarly, reference numeral 120 denotes one of the cylinders of the multi-cylinder internal combustion engine, 121 denotes a combustion chamber, 122 denotes an intake valve for opening and closing an intake port 123, 124 denotes a cylinder, and 125
Is a piston, and 126 is a spark plug. Also, 127
Is an intake passage, 128 is an intake pipe, 129 is an intake flow control device, 130 is an intake flow, and the intake flow control device 129 has an on-off valve 131. Two intake ports 123 are provided side by side, and in the case of this embodiment, the spray is injected toward the intake ports 123. This embodiment also constitutes a multipoint injection (MPI) system.

The characteristic of this multi-cylinder internal combustion engine is that the intake passage 127 is located in a range where the spray downstream of the intake flow control device 129 flows.
Is provided, the partition plate 1 is provided.
32 produces a flow with a high intake flow velocity. The purpose is to eliminate transport delays while promoting atomized atomization and mixing. By optimizing the injection timing, the quality of the air-fuel mixture in the cylinder and the state of formation are improved. .

As in the embodiment shown in FIG. 1, the fuel spray injected from the electromagnetic fuel injection valve 1 is prevented from adhering to the inner wall surface of the intake pipe 128 and directed to the dish 122a of the intake valve 122. Generated. That is, the spray has a hollow cone shape with a thin center portion and a thick outer portion, and is uniformly dispersed on the surface of the plate portion 122 a of the intake valve 122.

A combustion test was also conducted on the internal combustion engine of this embodiment, and it was confirmed that the ignition performance was good and the stable combustion range was expanded, and that the exhaust gas performance and the fuel consumption were improved.

FIG. 3 is a schematic view showing a state in which an electromagnetic fuel injection valve having another spray form according to the present embodiment is mounted on an intake pipe of a multi-cylinder internal combustion engine of the same type as that of FIG. 1 as viewed from above the engine. FIG.

Similarly, reference numeral 140 denotes one of the cylinders of the multi-cylinder internal combustion engine, 141 denotes a combustion chamber, 142 denotes an intake valve,
143 is a central partition, 144 is a spark plug, and 145 is an exhaust valve. On the other hand, 146 is an intake passage, and 147 is an intake flow control device arranged in the intake passage 146. 1
Numerals 48 and 149 indicate the flow of intake air, and are arranged such that when the intake air flow control device 147 is tilted to either side, the speed of one air flow is increased.

The intake air flow control device 147 has its on-off valve 14
The axial direction of the rotary shaft 147b of the shaft 7a is configured to face the mounting side of the electromagnetic fuel injection valve 1 on the wall forming the intake passage 146. Alternatively, the valve shaft of the electromagnetic fuel injection valve 1 is configured such that a valve shaft (or a valve shaft center or a center axis line) coincident with the driving direction of the valve body and the rotation shaft 147b are in the same plane. Alternatively, the rotary shaft 147b is configured so that the axial direction thereof is substantially perpendicular to a plane including two central axes imaginary in the injection directions of the two sprays injected from the electromagnetic fuel injection valve 1. The electromagnetic fuel injection valve 1 directs one of the two fuel sprays to one side on one side with respect to a surface including the rotation shaft 147b and the valve shaft of the electromagnetic fuel injection valve 1, The fuel is injected by directing the other fuel spray of the two fuel sprays to the other side with respect to. Further, the intake air flow control device 147 detects two fuel sprays 15 injected from the electromagnetic fuel injection valve 1 in two directions.
0 and 151 are arranged so that the flow rate of air supplied to each of them can be changed.

In FIG. 3, the flow 148 of the intake air has a high flow velocity, and the flow 149 has a low flow velocity. Two intake valves 142 are juxtaposed, and even in this embodiment, the spray is sprayed toward the intake port 142. Also in the present embodiment, the electromagnetic fuel injection valves 1 are disposed one by one on the upstream side of the intake valve 142, and constitute a multipoint injection (MPI) system.

The feature of this embodiment is that the electromagnetic fuel injection valve 1
In the form of fuel spray from. Although a specific method related to spray generation will be described later, the method is generated in the intake passage 146.
A fine atomized hollow spray having a low penetration force is generated on the side of the intake flow 148 having a high flow rate, and a hollow spray having a strong penetration force is generated on the side of the intake flow 149 having a low flow rate. As described above, by optimizing the flow of the airflow and the form of the spray, the delay in transporting the fuel spray is eliminated, and the quality of the air-fuel mixture generated in the combustion chamber 142 (stratification of the air-fuel mixture) is improved. The combustion stabilizes.

A combustion test was also performed on the internal combustion engine of this embodiment, and it was confirmed that the ignition performance was good, the stable combustion range was expanded to the lean burn side, and the exhaust gas performance and fuel efficiency were improved. Was.

Next, the structure and operation of the fuel injection valve 1 capable of generating such spray will be described with reference to FIGS.

FIG. 4 shows an electromagnetic fuel injection valve 1 according to the present invention.
FIG. Hereinafter, the structure and operation will be described.

The electromagnetic fuel injection valve 1 injects fuel by opening and closing a valve seat in accordance with a duty ON-OFF signal calculated by a control unit.

The magnetic circuit has a substantially cylindrical tube 2 having a fuel introduction portion at one open end 2a and a core having the other open end 2b, and an outer periphery near the open end 2b of the cylindrical tube 2. Into a thin cylindrical member 7, one end of which is inserted and fixed in the part,
A tubular piece 3 partially fixed and made of a ferromagnetic material and having a function as a yoke configured to at least partially surround the electromagnetic coil 5, and a plug for closing one end of the tubular piece 3; The body part 4 and the cylindrical anchor 6 facing the end face of the open end 2b of the cylindrical tube 2 acting as a core with a gap therebetween.
It is composed of

When the valve body 10 is formed by rolling a plate-like member having an opening 8 a partially on the inner peripheral surface of the anchor 6, the rod 8 is welded to the other open end of the rod 8. The ball 9 is stopped. The valve body 10 is guided by the outer periphery of the anchor 6 and the ball 9. The ball 9 has a plurality of cut surfaces 9a for allowing fuel to pass therethrough. The ball 9 is in contact with a valve seat surface 12 formed on the valve seat member 11. The valve seat member 11
A guide surface for guiding the ball 9 is formed in the inner diameter portion of.

The valve seat member 11 has an inner peripheral surface 7a at one end of a thin cylindrical member 7 made of a non-magnetic material or a weak magnetic material.
A plate having a fuel swirling mechanism that plays the role of atomization and a plate having a hole (through hole) of a desired shape (including size) for controlling the injection direction and the spray pattern. Is press-fitted and fixed. The plate with a fuel swirling mechanism is composed of a fuel in plate 13 and a swirl plate 14, and a plate having holes for controlling the injection direction and the spray pattern is composed of an injection plate 15. In the present embodiment, the fuel in-plate 13, the swirl plate 14, and the injection plate 15 are press-fitted and fixed to the thin cylindrical member 7 in this order on the downstream side of the valve seat member 11 from the upstream side.

Each of the above plates has a thickness dimension (dimension in the valve axis direction when assembled in the electromagnetic fuel injection valve 1) which is very large relative to a dimension (radial dimension) perpendicular to the thickness direction. It is a plate-like member having a small value.

Reference numeral 16 denotes a welded portion of a laser or the like, which corresponds to the outer peripheral portion of the injection plate 15, and prevents fuel from leaking to the outside.

When the valve seat member 11, the fuel in-plate 13, the swirl plate 14, and the injection plate 16 are press-fitted and fixed, the valve 10 is
End face of anchor tube 6 and open end 2b of tubular tube 2 acting as a core
The gap with the end face is adjusted. That is, this gap is formed as the amount of movement of the valve element 10 in the axial direction. Further, the valve body 10 is moved by the return spring 17 to the valve seat member 1.
The pressing force is adjusted by the axial position of a winding bush 18 formed of a plate material in a roll shape.

In the present embodiment, the lower end surface of the cylindrical tube 2 serving as a core functions as a stopper for receiving the anchor 6 during the valve opening operation. For this reason, the cylindrical tube 2
It is preferable that chromium plating or the like be treated by electrolytic plating or the like on the lower end surface of the anchor 6 or the upper end surface of the anchor 6.

The coil 5 for exciting the magnetic circuit includes a bobbin 19
It is wound. The terminal 21 of the coil 5 is connected to a terminal of a control unit (not shown).

The outer peripheral portion of the cylindrical tube 2 serving as a core and the tubular piece 3 having a function as a yoke are surrounded by an injection-molded plastic molded body 20. In this case, the coil terminals 21 are also integrally formed. Also,
An O-ring 23 for gas sealing is provided between the one end surface 20a side of the plastic molded body 20 and the bush 22 inserted and fixed to the end 7a of the cylindrical member 7. Further, an O-ring 24 for fuel sealing is provided on the other end 20b side.
Is provided. Reference numeral 25 denotes a filter, which is provided to prevent dust and foreign matter in the fuel from entering between the ball 9 and the valve seat surface 12, that is, the so-called valve seat surface side.

The operation of the electromagnetic fuel injection valve 1 configured as described above will be described. The valve body 10 is moved up and down in the axial direction by the electrical ON-OFF signal given to the electromagnetic coil 5 to open and close the gap between the ball 9 and the valve seat surface 12, thereby controlling the fuel injection. Electric signal is coil 5
, A magnetic circuit is formed by the tubular tube 2 serving as a core, the tubular piece 3 having a function as a yoke, and the anchor 6, and the anchor 6 is attracted to the tubular tube 2 side. When the anchor 6 moves, the ball 9 integrated with the anchor 6 also moves and separates from the valve seat surface 12 of the valve seat member 11, and the fuel passage is opened upstream of the fuel in plate 13.

The fuel flows from the filter 25 into the inside of the electromagnetic fuel injection valve 1, and reaches the downstream through the internal passage of the tubular pipe 2, the inside of the anchor 6, and the opening of the rod 8 connected to the anchor 6. The swirling force is applied from the valve seat surface 12 of the valve seat member 11 to the swirl plate 14 further downstream through the outer peripheral portion of the fuel in-plate 13, and the fuel is injected from the injection plate 15.

Here, the configurations of the fuel in plate 13, the swirl plate 14, and the injection plate 15 will be described with reference to FIGS.

FIG. 6 is a front view of each plate. FIG.
(a) shows the fuel in plate 13 and D
It has cut surfaces 13a, 13a. This D cut surface 13
The passage walls of the fuel passage communicating from the upstream end surface to the downstream end surface of the fuel in-plate 13 are formed by a and 13a. FIG. 6B shows the swirl plate 14. The swirl plate 14 has two through holes (swirl chambers 14a) penetrating from the upstream end face to the downstream end face and independently juxtaposed in the plane directions of the upstream end face and the downstream end face. A fuel passage (offset passage 14b) is provided in the swirl chamber 14a and communicates with the swirl chamber 14a so as to point in a direction offset with respect to the center of each swirl chamber 14a. Swirl room 1
4a has a circular cross section perpendicular to the valve shaft. In the present embodiment, each of the swirl chambers 14
One pair (two) is provided for the swirl chamber 14a and connected in the tangential direction of the swirl chamber 14a. The offset passage 14b constitutes a fuel passage as a turning force applying means for applying a turning force to the passing fuel. The swirl chamber 14a may be included in the turning force applying means. FIG. 6C shows the injection plate 15, which penetrates from the upstream end face to the downstream end face so as to be directed in mutually different directions, and is independent of the face directions of the upstream end face and the downstream end face. Two fuel injection holes 15a formed by two juxtaposed through holes are formed. Each of the two fuel injection holes 15a is provided at a position corresponding to the center of each of the two swirl chambers 14a. These plates 1
3, 14, 15 are thin plates (0.08mm to 0.5mm in thickness)
), But the processing is based on press molding, etching molding, etc., and can be produced in large quantities without variation.

The D-cut surface 13a, which is an axial passage provided in the fuel in plate 13, has a function of forming a fuel passage, and is located at a position corresponding to the downstream offset passage 14b in the valve axial direction. Hole to penetrate (hole)
Or the like.

FIG. 7 shows an example of the structure of the fuel injection holes 15a formed in the injection plate 15, and is a sectional view taken along line XX of FIG. 6 (c). The center line of the two fuel injection holes 15a is set at 5 ° so that the distance between them becomes wider toward the downstream side.
The sandwiching angle θh is set within an angle such that the spray center is directed to each intake valve center position in a two-intake-valve type internal combustion engine described later.

FIG. 8 shows a state in which the fuel in plate 13, the swirl plate 14, and the injection plate 15 are assembled to constitute the spray generating means. FIG. 8A is a front view as viewed from the upstream side in the valve shaft direction, and FIG. 8B is a side view as viewed from the direction of arrow b in FIG. 8A. This means for assembling is carried out when assembling into the injection valve 1 as described above, but may be formed in advance by adhesive bonding as shown in the figure. In addition, about the fuel in plate 13 and the swirl plate 14,
A nonmetallic material may be used, and the function is sufficiently satisfied.

Hereinafter, the fuel passage will be described. Fuel flows into the offset passage 14b exposed from the D-cut surface 13a of the fuel in plate 13 from above, and flows into the swirl chamber 14a communicating with the two pairs of offset passages 14b. At this time, a turning force is applied to the fuel. This swirling fuel reaches the fuel injection hole 15a located below the center of the swirl chamber 14a and is injected outside the fuel injection valve 1.

FIG. 9 shows the form of the injected spray. The spray is bi-directional. This is a case where the swirl strength of the fuel for generating each spray is designed to be the same. The spray 100a has a hollow cone-shaped spray form in which the outer (peripheral) portion is dense and the central portion is thin. FIG. 3B shows the flow distribution measured by the receiving method. The distribution is almost symmetric with respect to the flow center O. This flow center O
From the distance M between the fuel injection valve 1 and the central axis of the injector 1, and the length L of a perpendicular drawn from the tip of the electromagnetic fuel injection valve 1 to a line YY connecting the centers of the two intake ports 104. The angle θs obtained theoretically corresponds to θh in FIG. Spray 10
Oa is uniformly distributed on the surface of the intake valves 103, avoiding the central portions of the plates 103a and 103b. The spray angle θs is set to 10 ° to 20 °. That is, it is set to be equal to or smaller than the central angle of the intake valve in a two-intake-valve type internal combustion engine. The reason for this setting is that it has been confirmed by a visualization experiment that the spray droplets are attracted outward by the intake air flow, that is, are attracted to the intake pipe inner wall surface 109a side.

As shown in FIG. 3, two sprays 150, 1
In order to make the penetration force (penetration) different at 51, the strength of the swirl fuel generated by the swirl plate 14 may be made different. Specifically, this can be dealt with by adjusting the passage cross-sectional area of the offset passage 14b, the offset amount, and the like. The penetration force increases as the offset amount decreases, and the penetration force decreases as the cross-sectional area of the passage decreases.

In the configuration of the electromagnetic fuel injection valve 1 of the embodiment shown in FIGS. 1 to 3, the following considerations are made.
In addition, it has the characteristic.

(1) Regarding the improvement of atomization of the injected fuel,
This is performed by giving a swirling force to the fuel by the swirl plate 14. The fuel introduced from above (upstream side) reaches an offset passage 14b offset with respect to the center axis of the swirl plate 14, and a swirling force is applied by the offset passage 14b to reach the swirl chamber 14a. The swirl chamber 14a extends from the axial passage 13a formed in the upstream fuel in-plate 13.
Up to this point, since there is a lossless flow passage space that allows the desired fuel to pass through, the pressure energy is effectively converted into swirling energy and injected through the fuel injection holes 15a formed in the downstream injection plate 15. At this time, atomization is promoted.

(2) The injection direction is controlled by the injection plate 15. The injection plate 15 has two inclined fuel injection holes 15.
a, 15a are provided. In the case of each of the above embodiments,
Injection control is performed in two injection directions and toward the intake valve. The fuel injection hole 15a is located below the center (downstream side) of the swirl chamber 14a formed in the upstream swirl plate 14, and effectively injects swirl fuel. The inclination of the fuel injection hole 15a is 5 ° to 10 ° so that the two sprays do not interfere with each other.

(3) In adjusting the injection amount, the injection amount is precisely manufactured by the thin (thin plate) plates 13, 14, and 15 which are formed to be very thin with respect to the diameter.
That is, the D formed on the fuel in plate 13
The cut surface 13a, the swirl chamber 14a formed in the swirl plate 14, and the fuel injection holes 15a formed in the injection plate 15 are manufactured without unevenness by press punching or etching and assembled to the injection valve 1. ing. In this assembling, since the assembling load is received via the injection plate 15, the fuel in plate 13 and the swirl plate 14 located on the upstream side do not receive a large uneven load. The outer peripheral portion 16 of the injection plate 15 is fixed by laser welding or the like. However, since the fixing position is farther than the fuel injection hole 15a, the injection plate 15 has a structure that is hardly affected by heat deformation.

(4) Advantages in Processing and Assembly The fuel in plate 13 and the injection plate 15 use extremely thin plate materials. For example,
The workability is extremely easy, and it is manufactured by a method such as press punching or etching. For this reason, even if it is manufactured in large quantities, it is possible to minimize variations in dimensions and shapes. In addition, since it can be mass-produced, it is manufactured at low cost.

Further, the fuel in plate 13 and the swirl plate 14 may be made of a different material having good workability (for example, a non-metallic material), so that the productivity can be further increased.

As shown in FIG. 8, if they are integrally formed by adhesive bonding, assembly to the fuel injection valve main body can be performed more easily. This facilitates the handling of the components on the production line, but also facilitates the handling of the foreign matter after processing and the dimensional control. In particular, since the check can be performed at the component level, it is not necessary to dispose of the injection valve together with the main body, which is a great merit in terms of cost.

Next, another embodiment of the electromagnetic fuel injection valve will be described with reference to FIGS. 10 and 11. FIG.

In contrast to the embodiment shown in FIGS.
As shown in FIG. 0, a needle valve 30 may be used for the valve body.

In the present embodiment, the fuel flows around the valve body, passes through the vertical passage 34 of the anchor 33, passes through the fuel passage 31 provided in the valve body guide 32, and the valve seat surface 12 and the needle valve 30.
Is supplied to the contact portion. Also in this configuration, FIGS.
The same operation and effect as those of the third embodiment can be obtained.

FIG. 11 is a longitudinal sectional view of a valve tip portion of an electromagnetic fuel injection valve having an injection plate 41 provided with a plurality of fine holes as a method of generating a spray form. In the figure, the figure (b) is a view in the Z direction of the figure (a). When the ball 9 is driven to move away from the valve seat surface 12 and the fuel passage is opened upstream of the fuel in-plate 40, fuel flows from the valve seat surface 12 through the vertical holes 40a, 40a of the fuel in-plate 40, It reaches the injection plate 41 further downstream. Here, the fuel is injected from a plurality of fine holes 42 and 43 provided in the injection plate 41. In this case, the number of the fine holes 42 and the number of the fine holes 43 are different, and the form of the spray to be sprayed is different depending on the number. That is, the penetration force of the spray ejected from the fine holes 42 is strong, while the penetration force of the spray ejected from the fine holes 43 is weak and the atomized spray is obtained. Such a spray form is suitable for the internal combustion engine shown in FIG. In this embodiment, the same operation and effect as those of the embodiment shown in FIGS. Note that this embodiment has an advantage that various spray forms can be obtained depending on the hole diameter, the number of holes, and the angle of the holes.

[0059]

According to the present invention, upstream of the two fuel injection holes provided downstream of the valve seat and downstream of the valve seat,
By providing a swirl force applying means for applying a swirl force to the fuel corresponding to each fuel injection hole, atomization of the fuel injected in two directions can be improved. Further, by providing a means for making the penetration force different between the fuel sprays injected in two directions, it is possible to eliminate a time delay between the two fuel sprays before reaching the combustion chamber.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of application to an internal combustion engine.

FIG. 2 is a diagram showing an example of application to an internal combustion engine.

FIG. 3 is a diagram showing an example of application to an internal combustion engine.

FIG. 4 is a longitudinal sectional view of the fuel injection valve.

FIG. 5 is an enlarged vertical sectional view of an injection nozzle portion.

FIG. 6 is an explanatory diagram of each plate.

FIG. 7 is a sectional view of an injection plate.

FIG. 8 is an assembly view of a plate.

FIG. 9 is a view showing a spray pattern.

FIG. 10 is a longitudinal sectional view of an injection nozzle when a needle valve is used.

FIG. 11 is a longitudinal sectional view showing another embodiment of the injection nozzle portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve, 2 ... Cylindrical tube which works as a core, 3 ... Tubular piece which works as a yoke 6 ... Anchor, 7 ... Cylindrical member, 8 ... Rod, 9 ... Ball valve, 12 ... Valve seat surface, 13 ... Fuel-in Plate, 1
4 ... swirl plate, 15 ... injection plate, 16 ... laser welding part.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 69/04 F02M 69/04 P (72) Inventor Motoyuki Abe 502, Kandamachi, Tsuchiura-shi, Ibaraki Japan (72) Inventor Ayumu Miyajima 502, Kandachicho, Tsuchiura-shi, Ibaraki Pref. Inside Machinery Research Laboratories, Inc. (72) Inventor Masami Nagano 2520 Odaiba, Hitachinaka-shi, Ibaraki Prefecture Hitachi, Ltd. F-term in device group (reference) 3G066 AA01 BA03 BA04 CC01 CC24 CC37 CC48 CE22

Claims (11)

[Claims] 1. A valve seat, a valve body provided so as to be able to contact and separate from the valve seat, two fuel injection holes provided downstream of the valve seat, and the valve seat upstream of the fuel injection hole. A fuel injection valve provided with a swirl force applying means for applying a swirl force to the fuel and provided with a swirl force to the fuel at a downstream side of the fuel injection hole, so as to inject fuel in two directions from the two fuel injection holes. . 2. The fuel injection valve according to claim 1, wherein the turning force applying means includes a through hole penetrating from an upstream end face to a downstream end face of the plate-shaped member, and an offset with respect to a center of the through hole. A fuel passage for introducing fuel into the through-hole in a direction defined by the arrow, and a plate-like member positioned upstream of the fuel injection hole. The plate-like member is arranged in a plane direction of the plate-like member. A fuel injection valve characterized in that: 3. The fuel injection valve according to claim 1, wherein the fuel injection valve penetrates from the upstream end face to the downstream end face so as to be directed in mutually different directions, and is independent of the plane directions of the upstream end face and the downstream end face. A first plate-shaped member having two fuel injection holes formed by two through holes arranged in parallel with each other; and a surface direction of an upstream end surface and a downstream end surface that penetrates from an upstream end surface to a downstream end surface. The two swirling forces, each of which is constituted by two through holes independently arranged in parallel with each other, and a fuel passage provided in each through hole and communicating in a direction offset with respect to the center of the through hole. A second plate-like member having a means, and the two through-holes of the second plate-like member in the order of the first plate-like member and the second plate-like member from the downstream side of the fuel flow. Each of the holes corresponds to the two fuel injection holes of the first plate-shaped member. A fuel injection valve, characterized in that laminated so as to communicate with the respectively. 4. The fuel injection valve according to claim 1, wherein the fuel injection valve penetrates from an upstream end face to a downstream end face so as to be directed in mutually different directions, and is independent of the plane directions of the upstream end face and the downstream end face. A first plate-shaped member having two fuel injection holes formed by two through holes arranged in parallel with each other; and a surface direction of an upstream end surface and a downstream end surface that penetrates from an upstream end surface to a downstream end surface. The two swirling forces, each of which is constituted by two through holes independently arranged in parallel with each other, and a fuel passage provided in each through hole and communicating in a direction offset with respect to the center of the through hole. A second plate-like member having a means, and a third plate-like member having a passage wall surface forming a fuel passage communicating from an upstream end surface to a downstream end surface. From the downstream side, the first plate-like member, the second plate-like In the order of the member and the third plate-shaped member, the third
The fuel passage of the second plate-shaped member communicates with the fuel passage of the second plate-shaped member, and each of the two through holes of the second plate-shaped member is the two fuel injection holes of the first plate-shaped member. Wherein the fuel injection valve is laminated so as to communicate with each of the fuel injection valves. 5. The fuel injection valve according to claim 1, wherein a swirl force applied to fuel is made different between the two swirl force applying means, so that the two fuel injection holes are provided. A fuel injection valve characterized in that the penetration force of the fuel spray injected from the fuel tank is made different. 6. An intake pipe for supplying air to an internal combustion engine, an intake flow control device for controlling a flow of air flowing through the intake pipe, and fuel being injected into the intake pipe downstream of the intake flow control device. A fuel injection valve comprising: a valve seat, a valve body provided so as to be able to contact and separate from the valve seat, and two fuel injection devices provided downstream of the valve seat. And two or more fuel injection holes, each of which is provided upstream of the fuel injection holes and downstream of the valve seat in correspondence with each fuel injection hole and applies a swirling force to the fuel. A fuel injection device characterized by injecting fuel in two directions from the fuel injection device. 7. A valve seat, a valve body provided to be able to contact and separate from the valve seat, a fuel injection hole provided downstream of the valve seat to inject fuel in two directions, and a fuel injected in each direction. A fuel injection valve comprising means for making penetration force different between sprays. 8. An intake pipe for supplying air to an internal combustion engine, an intake flow control device for controlling a flow of air flowing through the intake pipe, and fuel being injected into the intake pipe downstream of the intake flow control device. A fuel injection valve comprising: a fuel injection valve that injects fuel in two directions, wherein the fuel injection valve has a different penetration force between fuel sprays injected in each direction. A fuel injection device comprising: 9. The fuel injection device according to claim 8, wherein
The fuel injection device is characterized in that the intake flow control device is arranged so as to be able to change an air flow rate supplied to each of two fuel sprays injected in two directions from the fuel injection valve. 10. The fuel injection device according to claim 9, wherein a rotation axis of an on-off valve of the intake air flow control device and a valve axis of the fuel injection valve are arranged in parallel, and the fuel injection valve is connected to the rotation shaft. And the valve shaft on one side with respect to a plane including the valve shaft.
A fuel injection device for directing one of the two fuel sprays and directing the other fuel spray of the two fuel sprays to the other side with the surface as a boundary, and injecting the fuel. . 11. The fuel injection device according to claim 8, wherein the means for making the penetration force different is such that the number of the fine holes for fuel injection for forming one fuel spray is two or more.
The fuel injection device according to claim 1, wherein a different number is set between the two fuel sprays so that two fuel sprays have different penetration forces.