JP2004132225A - Electromagnetic fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic fuel injection valve in which ignitability of an ignition plug is excellent, fuel economy is improved and exhaust gas is reduced, by mutually colliding jets from injection holes 23 to atomize sprays 24 and forming various spray patterns of high flexibility such as a flat type spray and a hollow cone type spray. <P>SOLUTION: By focusing attention on a point that the flat sprays 24 from a pair of the injection holes 23 form a spray unit 31 and a plurality of the spray units 31 are combined to form a spray group 32A in an optional shape, sprays of fuel from the pair of the injection holes 23 are mutually collided to form flat sprays 24 to form the spray unit 31 and a plurality of the pairs of the injection holes 23 capable of forming the spray units 31 are disposed. By combining a plurality of the spray units 31, the spray group 32A can be formed in the optional shape. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic fuel injection valve, and more particularly to an electromagnetic fuel injection valve for direct injection of in-cylinder fuel of a type in which gasoline or other fuel is directly injected into a combustion chamber.
[0002]
[Prior art]
Conventional electromagnetic fuel injection valves for in-cylinder direct fuel injection have a cone shape (holo cone shape, hollow cone shape) using a swirl flow of fuel by a spiral or inclined groove. There is a limit to improving the state of atomization or mixing with air, and there is still room for improvement in ignitability.
The conventional electromagnetic fuel injection valve 1 will be outlined based on FIGS.
FIG. 22 is a schematic sectional view of a conventional electromagnetic fuel injection valve 1 and a cylinder 2, and the electromagnetic fuel injection valve 1 faces a combustion chamber 3 in the cylinder 2. The piston 4 reciprocates up and down in the cylinder 2.
The conventional hollow cone-shaped spray 5 injected from the electromagnetic fuel injection valve 1 is guided to the vicinity of the ignition plug 6 by the airflow in the combustion chamber 3 as it rises by the piston 4 and ignites.
Therefore, the ignition characteristics are determined by many factors such as the shape of the combustion chamber 3, the shape and volume of the piston 4 and its cavity 7, and the relative positional relationship between the ignition plug 6 and the electromagnetic fuel injection valve 1. There is a problem that engine design becomes complicated. Further, it is necessary to solve other problems such as fuel consumption due to the fuel adhering to the piston 4 (cavity 7) and the inner wall surface of the combustion chamber 3, and it is difficult to reduce the exhaust gas. There is a problem that it takes.
[0003]
Therefore, for example, as in Patent Documents 1, 2, 3, and 4, high-pressure fuel is injected from at least a pair of injection holes and then collided with each other to change the spray shape or to spray as flat spray. In some cases, the fuel is atomized and the state of mixing with air in the combustion chamber 3 is improved.
[0004]
FIG. 23 is a longitudinal sectional view of an essential part of an electromagnetic fuel injection valve 10 according to Patent Document 1 or the like. The electromagnetic fuel injection valve 10 includes an electromagnetic coil 11, a return spring 12, an armature 13, , A nozzle body 14, a valve seat 15, a needle valve 16, a needle guide 17, and an orifice plate 18.
The valve seat 15 is welded to the tip of the nozzle body 14 (welded portion 19), and the orifice plate 18 is welded to the central recess of the valve seat 15 (welded portion 20).
[0005]
In the valve seat 15, a seat portion 21 of the needle valve 16 is formed, a fuel reservoir chamber 22 is formed upstream thereof, and a pair of opposed injection holes 23 are formed in the orifice plate 18 located downstream thereof. Is formed.
[0006]
The pair of injection holes 23 are viewed from the combustion chamber 3 at a predetermined inclination angle (an inclination angle with respect to the axis 16C of the needle valve 16 or a collision angle θ) and a relative interval (pitch P).
The orifice plate 18 is made of a disc material having a rectangular cross section and a good workability, such as SUS304.
[0007]
In the electromagnetic fuel injection valve 10 having such a configuration, the armature 13 is driven against the urging force of the return spring 12 by the excitation of the electromagnetic coil 11, and the needle valve 16 that is driven integrally with the armature 13 is moved from the seat portion 21. It lifts and injects high-pressure fuel into the combustion chamber 3 through the injection hole 23.
[0008]
The jets of the injected fuel injected from the pair of injection holes 23 collide with each other in the combustion chamber 3 to form a flat spray 24 (fan spray).
Specifically, a pair of high-pressure jets from a pair of injection holes 23 spread from a collision portion in a direction perpendicular to a plane including the jets. In other words, the jet is uniformly spread in an approximately oval or flat shape such that the front side in the collision direction of the jet is wide and the side side is narrow, so that atomization of the fuel is realized by the collision of the high-pressure jet and combustion. Mixing with the air in the chamber 3 is performed well.
Since the shape or form of the spray 24 is thin and wide, depending on the mounting form of the electromagnetic fuel injection valve 1, fuel adheres to the top surface of the piston 4 when the piston 4 rising in the combustion chamber 3 is compressed. It is possible to suppress deterioration of exhaust gas or emission.
[0009]
Although the process of forming the injection holes 23 in the orifice plate 18 is simple, the seat portion 21 is close to the welded portion 20 formed by welding the orifice plate 18 to the valve seat 15 to avoid thermal deformation of the seat portion 21. Therefore, there is a problem that the degree of penetration of the welded portion 20 is restricted, and the fuel pressure that can be handled is limited.
Further, there is a problem that the dead volume between the tip of the needle valve 16 and the orifice plate 18 is relatively large, and there is a possibility that carbon deposits may be generated due to the adhesion or remaining of fuel near the injection holes 23.
[0010]
FIG. 24 is a longitudinal sectional view of an essential part of an electromagnetic fuel injection valve 25 according to Patent Document 3 or the like. The electromagnetic fuel injection valve 25 is an orifice plate in the electromagnetic fuel injection valve 10 (FIG. 23). The seat portion 21 is formed in the valve seat 15 and the injection holes 23 are formed directly in the valve seat 15 without using the valve seat 18.
[0011]
In the electromagnetic fuel injection valve 25 having such a configuration, since the welded portion 19 is not closer to the seat portion 21 than the welded portion 20 in the electromagnetic fuel injection valve 10 (FIG. 23), the degree of penetration is increased, and the welding strength is increased. However, it can handle high-pressure fuel.
Furthermore, the dead volume between the tip of the needle valve 16 and the valve seat 15 is relatively small, and the possibility of carbon deposit generation is low.
[0012]
However, in each case of the electromagnetic fuel injection valve 10 (FIG. 22) and the electromagnetic fuel injection valve 25 (FIG. 24), a flat spray having various shapes is provided more than the electromagnetic fuel injection valve 1 (FIG. 22). Although the spray 24 can be formed, the shape of the spray 24 is limited to a flat shape, and the ignition and combustion characteristics in the combustion chamber 3 and the restriction of the interaction with the piston 4 cannot be denied. Sufficient solutions have not yet been found for shape and design flexibility.
[0013]
In particular, there are stratified combustion and homogeneous combustion as the types of combustion in the fuel chamber 3, but there is a problem that it is difficult to obtain sprays of various shapes corresponding to the respective types.
In the stratified combustion, the spray 5 or the spray 24 from the electromagnetic fuel injection valve 1, the electromagnetic fuel injection valve 10 or the electromagnetic fuel injection valve 25 forms a layer in the fuel chamber 3 and is directly guided to the ignition plug 6. It can ignite and has good fuel economy characteristics.
In the homogeneous combustion, the piston 4 in the fuel chamber 3 rises, that is, is mixed with air by the rising airflow from the piston 4. The spray 5 and the spray 24 are mixed with the air and guided to the ignition plug 6 to burn. Therefore, it is difficult to prevent the spray from adhering to the piston 4, and there are problems in fuel efficiency, exhaust gas characteristics, and the like.
The conventional electromagnetic fuel injection valve 1 (FIG. 22), the electromagnetic fuel injection valve 10 (FIG. 23) or the electromagnetic fuel injection valve 25 (FIG. 24) forms a spray suitable for stratified combustion or homogeneous combustion. Is difficult.
[0014]
[Patent Document 1]
JP-A-8-14136
[Patent Document 2]
JP 2001-107824 A
[Patent Document 3]
Japanese Patent No. 3132283
[Patent Document 4]
Japanese Patent No. 3132296
[0015]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an electromagnetic fuel injection valve that can atomize gasoline and other fuels and spray them.
[0016]
Another object of the present invention is to provide an electromagnetic fuel injection valve that can make the jets from the fuel injection holes collide with each other to atomize the spray.
[0017]
Another object of the present invention is to provide an electromagnetic fuel injection valve capable of obtaining various spray patterns having a high degree of freedom, such as a flat type or a hollow cone type.
[0018]
Another object of the present invention is to provide an electromagnetic fuel injection valve excellent in ignitability or ignition performance by a spark plug.
[0019]
It is another object of the present invention to provide an electromagnetic fuel injection valve that collects spray around an ignition plug to improve fuel efficiency and reduce exhaust gas.
[0020]
Another object of the present invention is to provide an electromagnetic fuel injection valve that can have a large degree of freedom in a relative positional relationship with an ignition plug.
[0021]
Another object of the present invention is to provide an electromagnetic fuel injection valve that can form a spray without being largely affected by the shape of the cavity on the top surface of the piston.
[0022]
Another object of the present invention is to provide an electromagnetic fuel injection valve that can cope with either stratified combustion or homogeneous combustion.
[0023]
[Means for Solving the Problems]
That is, the present invention focuses on making it possible to form a spray group of any shape by combining a flat spray with a pair of injection holes into a spray unit, and by combining a plurality of the spray units, An electromagnetic coil, a nozzle body having at least a pair of injection holes formed so that jets of the respective injected fuels collide with each other, and a sheet on a sheet portion of the nozzle body, and the injection hole is excited by excitation of the electromagnetic coil. An openable and closable needle valve, wherein the electromagnetic fuel injector is configured to inject the jets of the fuel injected from the injection holes by colliding with each other and injecting the jets, wherein the flat fuel is injected from the pair of injection holes. A spray having a shape is defined as a spray unit, and a plurality of pairs of the injection holes capable of forming the spray unit are provided. By combining a plurality of Tsu bets, an electromagnetic fuel injection valve, characterized in that to enable form a spray group having an arbitrary shape.
[0024]
With the spray unit, a radial spray group can be formed.
[0025]
With the above-mentioned spray unit, it is possible to form a row of spray groups.
[0026]
With the above-mentioned spray unit, it is possible to form a hand-shaped spray group of hooks.
[0027]
The spraying units can make them non-continuous with each other.
[0028]
The spray units can make them continuous with each other.
[0029]
With the spray unit, the density of the spray group can be formed in an arbitrary distribution.
[0030]
The spray directions of the spray units of the spray groups can be different from each other.
[0031]
The penetrations of the spray units in the spray group can be different from each other.
[0032]
Spraying that does not rely on collision can be combined with the spraying unit.
[0033]
The configuration or shape of the injection hole itself is arbitrary.
[0034]
In the electromagnetic fuel injection valve according to the present invention, a spray having a flat shape formed by a pair of injection holes is used as a spray unit, and a plurality of spray units are combined to form a spray group having an arbitrary shape. Therefore, a spray group having an arbitrary spray shape can be formed by a combination pattern of the spray units.
Therefore, the degree of freedom of the spray pattern due to the spray collision is increased, and the radial shape such as triangular, square, hexagonal or octagonal shape, row shape, hand shape of hook, etc. Spray pattern can be formed.
Thus, with the atomization of the fuel, the required spray pattern can be arbitrarily formed according to the shape of the piston in the fuel chamber and the mutual positions of the electromagnetic fuel injection valve, the piston, and the spark plug. The fuel spray in the ideal mixed state can be injected in the vicinity of the fuel cell, the ignition plug and the cavity can be ignited without being wetted by the fuel, the fuel efficiency and the combustion characteristics can be improved, and the hydrocarbon (HC) can be injected. It is also possible to reduce nitrogen oxides (NOx), carbon monoxide (CO) and other exhaust gases.
In addition, since the spray shape can be freely changed without changing the injection flow rate from the injection hole, the degree of freedom in designing the spray shape according to the piston, spark plug, cavity, etc. is increased, and it can be used for either stratified combustion or homogeneous combustion. It is possible to respond and easily meet various requirements according to the engine characteristics.
[0035]
In addition, since the injection hole is formed directly at the tip of the valve seat, the dead volume between the tip of the needle valve and the valve seat can be reduced, and the generation of carbon deposit can be suppressed.
[0036]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an electromagnetic fuel injection valve 30 according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIGS. 22 to 24 are denoted by the same reference numerals, and detailed description thereof will be omitted.
FIG. 1 is a sectional view of a main part of the electromagnetic fuel injection valve 30. The electromagnetic fuel injection valve 30 includes the above-described electromagnetic fuel injection valve 1 (FIG. 22) and the electromagnetic fuel injection valve 10 (FIG. 23). Similarly to the electromagnetic fuel injection valve 25 (FIG. 24), a pair of injection holes 23 is formed at the tip end of the valve seat 15 so that the flat spray 24 can be injected.
However, by arranging a plurality of pairs of the injection holes 23 in an arbitrary pattern, as described later, the flat spray 24 is combined as a spray unit 31 to obtain various spray patterns.
[0037]
FIG. 2 is an enlarged cross-sectional view of a main part of the injection hole 23 in the valve seat 15. Elements relating to the spray shape and the penetration of the spray 24 include the respective collision angles θ1 and θ2 of the fuel injected from the injection hole 23. , Pitch P1, P2, and parameters such as deflection angle α (FIG. 1) and spray angle β (FIG. 1).
[0038]
FIG. 3 is a chart that has already described the relationship among the collision angles θ1, θ2, the spray angle β, and the penetration.
The collision angles θ1 and θ2 are equal to the inclination angles of the respective injection holes 23.
The deflection angle α is an inclination angle of the spray 24 from the axis 16C of the needle valve 16 (see FIG. 1).
The spray angle β indicates the spread angle of the flat spray 24 (see FIG. 1).
As shown in FIG. 3, as the collision angles θ1 and θ2 are larger and the spray angle β is larger, the penetration is smaller. Further, the smaller the collision angles θ1 and θ2 and the smaller the spray angle β, the larger the penetration. The larger the diameter of the injection hole 23, the larger the injection flow rate and the penetration.
Therefore, an arbitrary penetration can be obtained by adjusting the collision angles θ1, θ2, the spray angle β, and the hole diameter.
When the collision angles θ1 and θ2 increase, the spray 24 opens, and the shape becomes flatter. As the pitches P1 and P2 are narrower, the spray 24 opens and the shape becomes flatter.
Further, the pitches P1 and P2 affect the spray shape, and when the pitch is reduced, the generation of carbon deposit around the injection hole 23 can be suppressed.
[0039]
In the present invention, the flat spray 24 formed by the pair of injection holes 23 is used as one spray unit 31 and a plurality of the spray units 31 are combined, that is, a plurality of the pair of injection holes 23 are combined. Thus, a spray group having an arbitrary shape can be formed.
[0040]
For example, FIGS. 4 to 9 show radial spray groups.
FIG. 4 is a bottom view of the injection hole 23 and the spray 24 viewed from the downstream side (lower side) of the electromagnetic fuel injection valve 30, that is, from the fuel chamber 3 side. 24, that is, the spray units 31 form spray groups 32A and 32B whose cross sections perpendicular to the injection direction have a triangular shape.
As for the form of formation of the spray group 32A and the spray group 32B, the relative position and the inclined state of each pair of the injection holes 23, the hole diameter, and the like are selected. By adjusting the spray 24 from the injection hole 23, the spray group 32A in which the respective spray units 31 are slightly separated from each other as shown in FIG. 4 (1), and as shown in FIG. The case of the spray group 32B in which the ends of the respective spray units 31 are in contact with each other and are in a continuous state can be arbitrarily formed.
The configuration of the spray group 32A shown in FIG. 4A forms the spray unit 31 without spreading the spray from the pair of injection holes 23 so much.
In the configuration of the spray group 32B shown in FIG. 4 (2), the spray from the pair of injection holes 23 is spread, and the ends of the spray units 31 are brought into contact with each other to make them continuous.
[0041]
FIG. 5 is a schematic cross-sectional view of the electromagnetic fuel injection valve 30 facing the fuel chamber 3 by controlling the shape and the penetration of the spray group 32A (spray group 32B) by the electromagnetic fuel injection valve 30, for example. This can be brought close to the spark plug 6 directly, and a so-called spray guide type ignition system can be realized.
Therefore, as in the case of the conventional electromagnetic fuel injection valve 1 shown in FIG. 22, a so-called piston guide that brings the spray 5 close to the ignition plug 6 by the air flow in the combustion chamber 3 due to the rise of the piston 4 in the fuel chamber 3. Unlike the case of the type of ignition system, the spray group 32A (spray group 32B) is directly ignited by the ignition plug 6 in a mist state, so that ignitability can be improved.
In addition, since the injected spray fuel can be prevented from adhering to the upper surface of the piston 4 and the inner wall surface of the cylinder 2, it is possible to improve fuel efficiency and suppress exhaust gas.
[0042]
FIG. 6 is a bottom view similar to FIG. 4 showing square spray groups 33A and 33B formed by four pairs of injection holes 23. FIG. 6 (1) shows a square spray group 33A in a discontinuous state. FIG. 6 (2) shows a square spray group 33B in a continuous state.
Needless to say, by appropriately selecting the injection holes 23 and the parameters thereof, the spray group 33A and the spray group 33B can have any rectangular shape such as a square shape, a rectangular shape, a diamond shape, or a parallelogram shape.
[0043]
FIG. 7 is a perspective view showing a radial spray group 34 formed by four pairs of injection holes 23 as in the case of FIG. A long spray unit 34A (spray unit 31) and a short spray unit 34B (spray unit 31) sprayed from the other two pairs of spray holes 23 to positions facing each other.
That is, in the spray group 34, the long spray unit 34 </ b> A and the short spray unit 34 </ b> B are sprayed so as to surround the ignition plug 6 by making the respective spray directions different.
As described above, in the present invention, the ejection direction and the penetration of the spray unit 31 in the spray group can be made different.
[0044]
FIG. 8 is a bottom view similar to FIG. 4 showing hexagonal spray groups 35A and 35B formed by six pairs of injection holes 23, and FIG. 8 (1) shows a hexagonal spray group 35A in a discontinuous state. FIG. 8B shows a hexagonal spray group 35B in a continuous state.
[0045]
FIG. 9 is a bottom view similar to FIG. 4 showing octagonal spray groups 36A and 36B formed by eight pairs of injection holes 23, and FIG. 9 (1) shows an octagonal spray group 36A in a discontinuous state. FIG. 9B shows an octagonal spray group 36B in a continuous state.
Similarly, by arbitrarily adjusting the number of pairs of the injection holes 23 and further selecting various forms of the injection holes 23, an arbitrary type of hollow cone-shaped spray group is formed. Can be handled.
In addition, as the number of the injection holes 23 increases, the diameter of the holes can be reduced, and the flow rate can be obtained in a certain range.
[0046]
By forming the above-described radial spray, the conventional electromagnetic fuel injection valve 1 can form the hollow cone-shaped spray 5 by swirl, but can be formed by the collision spray 24 from a plurality of pairs of injection holes 23. As much as possible, the more the number of the injection holes 23, the closer to a conical shape.
In addition, the injection unit 23 can be obtained by forming the injection hole 23 by processing a circular hole in the valve seat 15, and since the injection hole 23 is a round hole, the realization is easy and the shape of the spray unit 31 is stable. Therefore, even if there is a slight variation in the hole shape and the collision angle, stable characteristics can be secured, and the electromagnetic fuel injection valve 30 having a small variation in mass production can be manufactured.
In the case of the conventional swirl type electromagnetic fuel injection valve 1, the flow rate of the injected fuel changes when the spray angle θ or the penetration is changed, but in the present invention, the flow rate of the fuel is only the diameter of the injection hole 23. Influences the flow rate, so that the flow rate is constant, and the spray angles θ1, θ2 and the penetration can be arbitrarily set.
In addition, since the spray unit 31 by collision is used, the spray group 32B (FIG. 4 (2)), the spray group 33B (FIG. 6 (2)), and the spray group 35B (FIG. 2)) and continuous sprays such as the spray group 36B (FIG. 9 (2)) can be obtained.
[0047]
Further, in the present invention, as shown in FIGS. 11 to 15, a plurality of spray units 31 can form a row of spray groups.
FIG. 10 is an explanatory diagram showing a flat spray 40 formed by a conventional arbitrary type of electromagnetic fuel injection valve 1 (see FIG. 22) and the relationship between the spray 40 and the piston 4. 10) is an explanatory view of the flat-shaped spray 40, FIG. 10 (2) is a longitudinal sectional view of the piston 4 portion in a state where the flat-shaped spray 40 is injected, and FIG. FIG. 4 is a cross-sectional view of a piston 4 portion in a state where fuel is injected.
The flat spray 40 shown in FIG. 10 (1) is generally formed by forming the injection hole opening of the electromagnetic fuel injection valve 1 into a flat cross section. In particular, FIG. 10 (3) As shown in FIG. 7, the end 40A of the flat spray 40 of the simple fan spray type adheres to the top of the piston 4 beyond the cavity 7 of the piston 4 and lowers fuel consumption and exhaust gas characteristics. is there.
[0048]
Such a problem can be solved by the spray group 50 by the spray unit 31 of the electromagnetic fuel injection valve 30 according to the present invention.
That is, FIG. 11 is an explanatory view showing a flat spray 50 and the relationship between the spray 50 and the piston 4 by the electromagnetic fuel injection valve 30 of the present invention. FIG. 11 (2) is a longitudinal sectional view of the piston 4 portion in a state where the spray group 50 is ejected, and FIG. 11 (3) is a transverse sectional view of the piston 4 portion in a state where the spray group 50 is ejected. is there.
The spray group 50 shown in FIG. 11A is configured such that the spray 24 (spray unit 31) is formed by colliding one of the pair of injection holes 23 with one hole diameter being slightly smaller than the other, so that the central spray unit Both ends of 50A become the rising part 50B, and the rising part 50B does not contact the piston 4.
Of course, the central spraying unit 50A and the advancing parts 50B at both ends thereof can also be constituted by the spraying units 31 from the three pairs of injection holes 23.
[0049]
When the spray group 50 having such a configuration is formed, as shown in FIG. 11 (3), particularly, the rising part 50B of the spray group 50 does not adhere to the top of the piston 4 beyond the cavity 7 of the piston 4. The spray group 50 can be ignited while approaching the ignition plug 6 in the mist state.
[0050]
FIG. 12 is an explanatory view showing another spray group 51. FIG. 12 (1) is an explanatory view of the spray group 51, and FIG. 12 (2) is an exploded view of the spray group 51 into individual spray units 31. FIG.
The spray group 51 is composed of a central spray unit 51A and a bulging unit 51B located at both ends of the central spray unit 51A by the spray unit 31 having four pairs of injection holes 23.
In particular, as shown in FIG. 12 (2), the collision angle of each injection hole 23 is changed for the central spray unit 51A and the bulging unit 51B.
That is, for the central spray unit 51A, the collision angle is reduced to obtain the narrow spray unit 31, and the density of the injected fuel is increased. Regarding the bulging unit 51B, the collision angle is increased to obtain a wide spray unit 31 and reduce the density of the injected fuel.
With the spray group 51 having such a configuration, the ignitability can be improved according to the request of the engine.
[0051]
FIG. 13 is an explanatory view showing a spray group 52 formed by three rows of spray units 31 arranged in parallel with each other. The spray group 52 is a single stratified-combustion spray unit that injects toward the cavity 7 of the piston 4. 52A (spray unit 31) and two homogeneous combustion spray units 52B (spray unit 31) that directly inject into the fuel chamber 3.
[0052]
If the spray group 52 having such a configuration is formed, the degree of freedom of the spray shape can be increased. In particular, if the density of the stratified combustion spray unit 52A is reduced, the ignition plug 6 The ignitability is not deteriorated by wearing. Further, by increasing the density of the homogeneous combustion spray unit 52B and separating the homogeneous combustion spray unit 52B from the spark plug 6, good ignitability can be obtained.
In particular, the spray unit 52A for stratified combustion enters the cavity 7 of the piston 4 and is guided to the ignition plug 6 in the fuel chamber 3 to perform stratified combustion, and the spray unit 52B for homogeneous combustion passes through the cavity 7 and In other words, the functions of the stratified-combustion spraying unit 52A and the homogeneous-combustion spraying unit 52B are shared such that homogeneous combustion is performed toward the inner wall surface on the opposite side of 2, and spraying suitable for both combustions is achieved. It is easy to obtain good combustion from homogeneous combustion to stratified combustion.
By combining the spray units 31 having different densities as described above, the density of the spray group 52 can be formed in an arbitrary distribution.
[0053]
FIG. 14 is an explanatory view showing another spray group 53. In the spray group 53, the spray unit 52B for homogeneous combustion of the spray group 52 (FIG. 13) is in a continuous state.
[0054]
FIG. 15 is an explanatory diagram showing another spray group 54. The spray group 54 has a configuration in which two spray units 52A for stratified combustion and three spray units 52B for homogeneous combustion are used.
[0055]
By forming the above-mentioned row of spray groups, fuel or spray does not adhere to the inner wall surface of the cylinder 2 or the cavity 7, so that fuel efficiency and exhaust gas characteristics can be improved.
[0056]
FIG. 16 is a longitudinal sectional view showing a flat spray 5 and a relationship between the spray 5 and the piston 4 by a conventional arbitrary type of electromagnetic fuel injection valve 1 (see FIG. 22). It is necessary to force the spray 5 injected from the injection valve 1 to approach the ignition plug 6 by the cavity 7 of the piston 4, and it is necessary to process the cavity 7 into a required shape as a means of the forcing force.
[0057]
However, according to the present invention, various spray groups in the shape of a hook can be formed by the plurality of spray units 31 from the electromagnetic fuel injection valve 30, so that the spray can be easily collected on the ignition plug 6 and the ignitability is improved. It is possible.
That is, FIG. 17 is an explanatory diagram of the V-shaped spray group 55. The spray group 55 is formed by connecting four spray units 31 with eight pairs of injection holes 23 in a V-shape. .
[0058]
FIG. 18 is a longitudinal sectional view showing the relationship between the spray group 55 (FIG. 17) and the piston 4 similarly to FIG. 16, and since the spray group 55 itself has a shape approaching the ignition plug 6, There is no need to intentionally provide the cavity 7 by processing the top surface of the piston 4, and the configuration of the piston 4 can be simplified.
[0059]
FIG. 19 is an explanatory view of another spray group 56, in which the reverse V-shaped (mountain-shaped) spray group 56 is on the opposite side of the spark group 6 from the spray group 55 (FIGS. 17 and 18). It was formed.
[0060]
FIG. 20 is an explanatory diagram of another spray group 57. The spray group 57 is located in a rectangular shape so as to surround the ignition plug 6.
[0061]
Further, the spray group in the present invention may be a mixture of the above-described collision spray and the conventional non-collision spray.
That is, FIG. 21 is an explanatory diagram of another spray group 58. In the spray group 58, in addition to the above-mentioned arbitrary collision spray group 58A, a spray unit without collision from the center or any part thereof By making the penetration of 58B different (longer), the spray unit 58B part without collision can also be shaped so as to make it easier to reach the spark plug 6.
[0062]
【The invention's effect】
As described above, according to the present invention, since the spray group is formed by arbitrarily combining the spray units by the collision of the injected fuel, it is possible to create various sprays having an arbitrary shape, density, penetration, and the like. In addition, it is possible to improve combustion characteristics and fuel efficiency and reduce exhaust gas in response to various demands of the engine.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of an electromagnetic fuel injection valve 30 according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part of an injection hole 23 in the valve seat 15;
FIG. 3 is a table showing the relationship between the collision angles θ1, θ2, the spray angle β, and the penetration.
FIG. 4 is a bottom view of the injection hole 23 and the spray 24 viewed from the downstream side (lower side) of the electromagnetic fuel injection valve 30, that is, from the fuel chamber 3 side.
FIG. 5 is a schematic sectional view of the electromagnetic fuel injection valve 30 facing the fuel chamber 3;
FIG. 6 is a bottom view similar to FIG. 4, showing quadrangular spray groups 33A and 33B formed by four pairs of injection holes 23;
FIG. 7 is a perspective view showing a radial spray group 34 formed by four pairs of injection holes 23, similarly to the case of FIG. 6;
FIG. 8 is a bottom view similar to FIG. 4, showing hexagonal spray groups 35A and 35B formed by six pairs of injection holes 23;
FIG. 9 is a bottom view similar to FIG. 4, showing octagonal spray groups 36A and 36B formed by eight pairs of injection holes 23;
FIG. 10 is an explanatory view showing a flat spray 40 formed by a conventional arbitrary type of electromagnetic fuel injection valve 1 (see FIG. 22) and a relationship between the spray 40 and the piston 4.
FIG. 11 is an explanatory view showing a flat spray 50 and a relationship between the spray 50 and the piston 4 by the electromagnetic fuel injection valve 30 of the present invention.
FIG. 12 is an explanatory view showing another spray group 51 of the same.
FIG. 13 is an explanatory view showing a spray group 52 by three rows of spray units 31 in a parallel state with each other.
FIG. 14 is an explanatory diagram showing another spray group 53 of the same.
FIG. 15 is an explanatory diagram showing another spray group 54 in the same.
FIG. 16 is a longitudinal sectional view showing a flat spray 5 formed by a conventional arbitrary type of electromagnetic fuel injection valve 1 (see FIG. 22) and a relationship between the spray 5 and the piston 4;
FIG. 17 is an explanatory view of a V-shaped spray group 55 by the electromagnetic fuel injection valve 30 of the present invention.
18 is a longitudinal sectional view showing the relationship between the spray group 55 (FIG. 17) and the piston 4, similarly to FIG.
FIG. 19 is an explanatory diagram of another spray group 56 of the same.
FIG. 20 is an explanatory diagram of another spray group 57 in the same.
FIG. 21 is an explanatory diagram of another spray group 58;
FIG. 22 is a schematic sectional view of a conventional electromagnetic fuel injection valve 1 and a cylinder 2.
FIG. 23 is a longitudinal sectional view of an essential part of a conventional electromagnetic fuel injection valve 10 according to Patent Document 1 or the like.
FIG. 24 is a longitudinal sectional view of an essential part of a conventional electromagnetic fuel injection valve 25 basically according to Patent Document 3 or the like.
[Explanation of symbols]
1 electromagnetic fuel injection valve (FIGS. 22, 10, 16)
2 cylinders
3 Fuel room
4 piston
5 Spray
6 Spark plug
7 Cavity of piston 4
10. Electromagnetic fuel injection valve (Fig. 23)
11 Electromagnetic coil
12 Return spring
13 Armature
14 Nozzle body
15 Valve seat
16 Needle valve
16C Axis of needle valve 16
17 Needle guide
18 Orifice plate
19 welds
20 welds
21 Seat
22 Fuel pool
23 injection holes
24 Flat spray
25 Electromagnetic fuel injection valve (Fig. 24)
30 electromagnetic fuel injection valve (embodiment, FIG. 1, FIG. 5, FIG. 11, FIG. 13, FIG. 18) 31 spray unit with flat spray 24
32A Triangular spray group in discontinuous state (Fig. 4 (1))
32B Triangular spray group in continuous state (Fig. 4 (2))
33A square spray group in discontinuous state (Fig. 6 (1))
33B Square spray group in continuous state (Fig. 6 (2))
34 Radial spray group (Fig. 7)
34A Long spray unit of spray group 34 (Fig. 7)
34B Short spray unit of spray group 34 (Fig. 7)
35A Hexagonal spray group in discontinuous state (Fig. 8 (1))
35B Hexagonal spray group in continuous state (Fig. 8 (2))
36A Non-continuous octagonal spray group (Fig. 9 (1))
36B Continuous octagonal spray group (Fig. 9 (2))
40 Flat spray (Fig. 10)
40A End of flat spray 40 (FIG. 10 (3))
50 Flat-shaped spray group (Fig. 11)
50A Central spray unit of spray group 50 (Fig. 11 (1))
50B Auction part of spray group 50 (Fig. 11 (1))
51 Spray group with different density (Fig. 12)
51A Central spray unit of spray group 51 (FIG. 12)
51B Swelling unit of spray group 51 (FIG. 12)
52 Row-shaped spray group in discontinuous state (Fig. 13)
52A Spray unit for stratified combustion of spray group 52
52B Spray unit for homogeneous combustion of spray group 52
53 Spray group in a row in a continuous state (Fig. 14)
54 Line-shaped spray group in continuous state (Fig. 15)
55 Hand-shaped spray group of hooks (Figs. 17 and 18)
56 Hand-shaped spray group of hooks (Fig. 19)
57 Rectangular spray group (Fig. 20)
58 Spray group by mixing with non-collision spray (Fig. 21)
58A Collision spray group of spray group 58
58B Spray unit without collision of spray group 58
θ, θ1, θ2 Inclination angle of injection hole 23 with respect to axis 16C of needle valve 16 (FIGS. 23 and 2)
P, P1, P2 Relative spacing (pitch) between the injection holes 23 (FIGS. 23 and 2)
α Deflection angle of spray 24 from axis 16C of needle valve 16 (FIG. 1)
β Spray angle indicating spread angle of flat spray 24 (Fig. 1)

Claims (10)

An electromagnetic coil,
A nozzle body having at least a pair of injection holes formed so that the jets of the respective injected fuels collide with each other,
A needle valve that seats on a seat portion of the nozzle body and that can open and close the injection hole by excitation of the electromagnetic coil;
An electromagnetic fuel injection valve configured to inject the jets of the fuel injected from the injection holes by colliding with each other, and
A flat-shaped spray sprayed from the pair of spray holes is used as a spray unit, and a plurality of pairs of the spray holes capable of forming the spray unit are provided.
An electromagnetic fuel injection valve characterized in that a spray group having an arbitrary shape can be formed by combining a plurality of the spray units. The electromagnetic fuel injection valve according to claim 1, wherein a radial spray group can be formed by the spray unit. 2. The electromagnetic fuel injection valve according to claim 1, wherein a row of spray groups can be formed by the spray unit. 2. The electromagnetic fuel injection valve according to claim 1, wherein the spray unit is capable of forming a hook-shaped spray group. 2. The electromagnetic fuel injection valve according to claim 1, wherein the spray units are in a discontinuous state. 2. The electromagnetic fuel injection valve according to claim 1, wherein the spray units are connected to each other. The electromagnetic fuel injection valve according to claim 1, wherein the spray unit enables the density of the spray group to be formed in an arbitrary distribution. 2. The electromagnetic fuel injection valve according to claim 1, wherein the injection directions of the spray units in the spray groups are different from each other. 2. The electromagnetic fuel injection valve according to claim 1, wherein the penetrations of the spray units in the spray group are different from each other. The electromagnetic fuel injection valve according to claim 1, wherein the spray unit is combined with a spray that does not depend on collision.

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