JP3079794B2 - Electromagnetic fuel injection valve, fuel swivel member for electromagnetic fuel injection valve, and fuel injection device using this valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fuel injection valve of an upstream pre-swirl type, a fuel swivel member for the electromagnetic fuel injection valve, and a fuel injection device using the valve.

[0002]

2. Description of the Related Art An upstream pre-swirl type electromagnetic fuel injection valve which applies a swirling force to a fuel flow upstream of a fuel injection port can easily atomize fuel. It is necessary to stabilize the flow by suppressing the turbulence of the flow. As a method for stabilizing the flow, Japanese Patent Application Laid-Open No. 3-70865 describes a technique for forming a projection at the tip of a valve element.

Further, Japanese Patent Application Laid-Open No. 2-241972 discloses a technique relating to the shape of a fuel flow path of a fuel swirling member for applying a swirling force to a fuel flow.

[0004]

The protrusion at the tip end of the valve element disclosed in Japanese Patent Application Laid-Open No. 3-70865 is characterized by the fact that the fuel flows flowing from the outer peripheral direction at the tip end of the valve element collide with each other. Turning in the direction prevents mutual collision of the fuel streams and induces a change in direction. For this reason, the protrusion is relatively large, and a part thereof reaches the injection hole passage. The amount of turbulence generated due to the presence of the protrusion is smaller than the amount of prevention of mutual collision of the fuel flows and the amount of turbulence reduced by the induction of direction change, and the protrusion has a fuel flow stabilizing effect. However, in the case of the upstream pre-swirling type electromagnetic fuel injection valve, even if there is no projection, a cavity that reaches the fuel injection hole from the valve element tip is generated, and the cavity prevents the mutual collision of the projection at the valve element tip, and the direction. A large projection for the direction change is not required since the function of guiding the change is performed. When a protrusion is formed at the tip of the valve body when the fuel flow has a swirl force, the cavity is generated from the protrusion tip, so the effect of stabilizing the cavity is recognized, but the fuel flow collides with the protrusion compared to the case of only the cavity. Turbulence caused by
In addition to the energy loss, there is a disadvantage that the energy is unbalanced by unnecessarily enlarging the cavity diameter, and the disturbance is further generated. In the case of only a cavity,
Since the cavity is not fixed to the valve body, its behavior adversely affects the stability of the flow, and there is a disadvantage that turbulence is generated and energy is lost.

A fuel swirling member disclosed in Japanese Patent Application Laid-Open No. 2-241972 is configured such that a position of an end face of a fuel flow path on a valve shaft center side is changed.
By making the axis closer to the center than the center position between the axis and the inner wall surface of the annular flow path, the swirling force of the fuel is reduced and the passage loss in the fuel swirl flow path is controlled to be small. However, since the cavity is formed by the swirling of the fuel flow, it is unstable when the swirling force is weak. Since the behavior of the cavity strongly influences the stability of the flow, it imparts sufficient swirling force to the fuel flow to form a stable cavity, and destabilizes the flow before the fuel flow reaches the cavity. Not be.

An object of the present invention is to provide an electromagnetic fuel injection valve which stably atomizes fuel injected from a fuel injection hole, and an electromagnetic fuel injection device using this electromagnetic fuel injection valve. It is in.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fuel swivel member provided upstream of a valve seat for applying a swirling force to supplied fuel, and a fuel swivel member provided downstream of the valve seat. An electromagnetic fuel injection valve that includes a fuel injection hole that is provided and a valve body that ejects fuel from the fuel injection hole, and controls the fuel injection rate by controlling the opening and closing time of the valve body. And a recess or an annular groove having a diameter smaller than the diameter of the fuel injection hole.

[0008] In order to further achieve the above object, the present invention provides:
At the tip of the valve element, a projection or an annular projection having a diameter smaller than the diameter of the fuel injection hole and having the tip of the valve element positioned upstream of the fuel injection hole when the valve is opened is formed.

Further, in order to achieve the above object, the present invention provides:
A flat part having a diameter smaller than the diameter of the fuel injection hole and perpendicular to the axis of the valve body is formed at the front end of the valve body whose front end is located upstream of the fuel injection hole.

[0010] In order to further achieve the above object, the present invention provides:
A gas outlet having a diameter smaller than the diameter of the fuel injection hole is formed at the tip of the valve body.

The above-described fuel swivel member has a cross-sectional area on the downstream side.
It is preferable to form a plurality of fuel swirl flow paths which reduce the number of fuel swirl paths .

[0012]

[0013]

[0014]

[0015]

When the fuel injection valve is opened, the fuel provided with the swirling force by the fuel swirling member on the upstream side of the valve seat flows between the valve body and the valve seat toward the fuel injection hole. At this time, the swirl of the fuel flow forms a cavity at the center of the flow path between the valve body tip and the fuel injection hole, but a flat portion perpendicular to the axis of the valve body is formed at the valve body tip. In this case, the tip of the formed cavity is stabilized at the flat portion. Further, when a projection or an annular projection, a concave portion or an annular groove is formed at the tip of the valve body, the tip of the hollow portion is fixed at these locations. The projection at the tip of the valve body is sufficiently low, and when the valve is opened, the tip is located upstream of the fuel injection hole, causing turbulence due to the fuel flow colliding with the projection, energy loss, and unnecessary expansion of the cavity diameter. Does not occur. Therefore, the flow is stabilized. When gas is ejected from the tip of the valve body to the fuel injection hole, a stable cavity is formed in the center of the fuel flow path by the ejected gas, and the flow is stabilized.

Further, by forming a fuel swirling flow path provided in the fuel swirling member for applying a swirling force to the fuel flow so as to have a reduced cross-sectional area on the downstream side, the turbulence is attenuated and the cavity is stabilized. Ru is formed Te.

[0017]

Embodiments of the present invention will be described below with reference to FIGS.

First, a first embodiment of the electromagnetic fuel injection valve of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve. Fuel is supplied from the fuel supply port 1 to the inside of the injection valve, and always reaches the nozzle portion 2. The spherical valve element tip 4 at the tip of the valve element 3 is pressed against the valve seat 6 by a spring 5. However, when the solenoid 7 is excited by a drive signal, it is attracted and separated from the valve seat 6. The fuel imparted with the swirling force at 8 is injected from the fuel injection holes 9. A recess 10 having a smaller diameter than the diameter of the fuel injection hole 9 is formed in the valve element tip 4 as shown in FIG. For this reason, as shown in FIG. 3, the tip of the cavity formed by turning the fuel flow is fixed by the concave portion 10, and the flow is stabilized.
Since the valve element 3 opens and closes at several tens of hertz, it is necessary to reliably reproduce the concentricity between the tip of the valve element and the fuel injection hole 9 for each valve opening operation in order to fix the position of the cavity. Surface Contacting Positioning Member 11 at Positioning Side of Valve Body and Positioning Member 1 on Fixed Side
Since the surface to be contacted at the time of positioning 2 is constituted by an axisymmetric conical surface, the contact surface has a centering action. Therefore, the concentricity between the valve body tip and the fuel injection hole at the time of valve opening can be reliably reproduced every valve opening operation. The contact surface at the time of positioning is not limited to a conical surface, and if the axisymmetric curved surface, both the valve body side and the fixed side, or one of them is composed of an axisymmetric curved surface or a surface inclined to the center axis of the valve body, the centering effect will be obtained. can get.

As described above, the generation of unstable shading of the fuel flow injected from the fuel injection holes 9 and the reduction of kinetic energy due to the disturbance do not occur, and the generation of giant particles due to the unstable shading of the injected fuel flow. Is prevented, and the kinetic energy of the fuel flow is efficiently used for atomization, so that atomization is promoted.

FIG. 4 is a longitudinal sectional view of a second embodiment of the electromagnetic fuel injection valve according to the present invention.
As shown in FIG. 5, the tip has a diameter smaller than the diameter of the fuel injection hole 9 to form a flat portion 13 perpendicular to the axis of the valve body 3. In this case, the tip of the cavity formed by the swirling of the fuel flow is fixed by the flat portion 13, and the flow is stabilized as shown in FIG. In the case of this embodiment, the fuel flow is more smoothly guided in the direction of the fuel injection holes 9 than in the first embodiment because the valve body tip portion 4 has a two-dollar shape, so that atomization by flow stabilization is achieved. The promotion effect increases.

FIGS. 7 to 10 are enlarged views of the distal end portion of the valve body in the third, fourth, fifth, and sixth embodiments of the electromagnetic fuel injection valve of the present invention.

FIG. 7 shows the valve element tip 4 having a projection 14 whose tip is located upstream of the fuel injection hole 9 when the valve is opened, and whose diameter is smaller than the diameter of the fuel injection hole 9. Since the tip of the projection 14 is located upstream of the fuel injection hole 9,
The collision of the fuel flow with the projections 14 is negligible, and there is no disturbance of the fuel flow and no loss of energy. The feature of this embodiment is that the action of fixing the cavity is stronger than the first and second embodiments.

FIG. 8 shows an embodiment in which the center of the projection of the valve element tip 4 in the embodiment of FIG. 7 is dented to form an annular projection 15, which further enhances the fixing action of the hollow portion.

FIG. 9 shows the valve body tip 4 of the first and second embodiments.
In the case where the annular recess 16 is formed, there is a feature that the recess is slightly processed.

FIG. 10 shows a combination of an annular projection 15 and a concave portion 12 on the valve body tip portion 4, and the effect of fixing the hollow portion is the strongest.

FIG. 11 is a longitudinal sectional view of a seventh embodiment of the electromagnetic fuel injection valve of the present invention, FIG. 12 is an enlarged view of a nozzle portion when the valve is closed in the embodiment of FIG. 11, and FIG. FIG. 14 is an enlarged view of the nozzle portion when the valve is opened in the embodiment, and FIG.
FIG. 4 is an enlarged view of a spring portion in the embodiment of FIG. A gas flow path 18 is formed at the tip of the valve body 3 at a gas supply port 17 and communicates with a gas source outside the fuel injection valve. This gas flow path 18
Among them, a flexible pipe 19 is provided in the section of the spring 5 to absorb a displacement caused by the movement of the valve element 3. The gas that has passed through the gas flow path 18 and jetted from the valve element tip 4 toward the fuel injection hole 9 stably forms a cavity as shown in FIG. As a result, the tip of the cavity is fixed, and the cavity surface is formed stably, so that the fuel flow is very stable.

Further, by performing the gas injection of this embodiment when the valve element 3 is closed, the gas adheres to the fuel injection hole 9,
Since the remaining fuel that is not injected can be blown off, there is a feature that the error of the fuel injection amount from the target injection amount is reduced.

FIGS. 15 and 16 correspond to FIGS.
The spring 5 and the flexible tube 19 in the bellows 2
Are those showing an example in which the 1, 15 is a vertical sectional view of an electromagnetic fuel injection valve, 16 Ru enlarged view der spring portion definitive in FIG 5. The bellows 21 presses the valve body 3 against the valve seat 6 and, at the same time, constitutes a part of the gas flow path 18.
It is separated from 0. In the case of this embodiment, the structure of the spring portion can be simplified. Next, the configuration of an electromagnetic fuel injection device using an electromagnetic fuel injection valve having a gas flow path will be described.

FIG. 17 is a block diagram of a first embodiment of an electromagnetic fuel injection device incorporating the electromagnetic fuel injection valve A of the present invention. An injector 22 is provided in an intake pipe 27 toward an intake valve 24 of an engine 23. Installed. Fuel is sent from the fuel tank 30 to the injector 22 by the fuel pump 31, and air is sucked into the injector 22 from between the main flow meter 33 and the throttle 29 of the intake pipe 27. The injector 22 is driven by the drive signal of the control unit 32 to inject fuel. In this case, the injector 22
Since the supply air to the air is a part of the air measured by the main flow meter 33, the measurement of the intake air amount for controlling the air-fuel ratio can be performed only by the main flow meter 33. Further, since the pressure on the upstream side of the throttle 29 is higher than that on the downstream side, the compressor for boosting the air supplied to the injector is not required, and the device configuration is simplified.

FIG. 18 is the second specific electromagnetic type fuel injection system
A configuration diagram of an example, an example in which the gas source and the exhaust pipe 28. The injector supply gas is metered by the auxiliary flow meter 34 for air-fuel ratio control. This specific example is characterized in that the exhaust gas is purified by recirculating the exhaust gas to the combustion chamber 26.

[0032] Figure 19 is a third specific electromagnetic fuel injector
Examples diagram of an example <br/> when the gas source is a pressure source 35. The injector supply air is metered by the auxiliary flow meter 34 for air-fuel ratio control. This specific example has a feature that the pressure and the flow rate of the ejected gas can be controlled according to the fuel flow rate and the swirling force.

FIG. 20 is a fourth specific electromagnetic fuel injector
A configuration diagram of an example, an example in which the gas source and the atmosphere. Here, the air is sucked through the air cleaner 36.
Injector supply air is supplied by auxiliary flow meter 3 for air-fuel ratio control.
4 weighed. This specific example has a feature that the gas suction portion can be separated from other engine parts.

FIG. 21 is a perspective view of an example of the fuel swirling member 8 in the above-mentioned electromagnetic fuel injection valve. A plurality of fuel swirl flow paths 37 each formed of a groove having a constant height face the contact direction with respect to the outer periphery of the valve element 3, and the cross-sectional area of the swirl flow path 37 decreases to the downstream side. I have. As is generally known, the turbulence of the flow is reduced by the speed increase. Therefore, the turbulence caused by the partial separation near the entrance of the swirl flow path 37 is reduced by the speed increase in the swirl flow path 37. Does not propagate to Furthermore, as compared with a conventional fuel swirling member having a uniform cross-sectional area, the flow velocity at the inlet side of the swirling flow path 37 can be reduced, so that the energy loss due to the turbulence of the flow is reduced. Greater effect.

[0035] FIGS. 22 39, show another example of a fuel swirl member, 22, 24, 26, 35 from FIG. 32, FIGS. 37 and 38, in FIG. 1 It is the figure which looked at the cross section of the fuel swirling member 8 installed as shown from the lower side.

FIG. 22 is a cross-sectional view of another specific example of the fuel swivel member, and FIG. 23 is a vertical cross-sectional view of FIG.
In order to form the cavity stably, an appropriate turning force is required, and the flow upstream of the cavity must not be unstable. In the case of this embodiment, the plurality of fuel swirl flow paths 37 into which fuel flows in from the vertical fuel supply path 40 are each formed of a groove having a constant height, and the groove width is narrowed downstream. Since the cross-sectional area decreases to the downstream side, the flow velocity in the fuel swirl flow path 37 increases to the downstream side. As is generally known, the turbulence of the flow is attenuated by the speed increase, and the turbulence generated by the partial separation near the inlet of the fuel swirl flow path 37 is attenuated by the speed increase in the fuel swirl flow path 37, so that it is downstream. Does not propagate to Further, as compared with the conventional fuel swirling member 8 having a uniform cross-sectional area, since the flow velocity at the inlet side of the fuel swirling flow path 37 can be reduced, energy loss due to flow turbulence is reduced. Great stabilizing effect.

FIG. 24 is a cross-sectional view of still another specific example of the fuel swirling member, and FIG. 25 is a vertical cross-sectional view of FIG. In the case of this embodiment, the groove width of the plurality of fuel swirl flow paths 37 is wide, so that it is possible to easily cope with a case where the fuel flow rate is large.

FIG. 26 is a transverse sectional view of still another specific example of the fuel swirling member, and FIG. 27 is a vertical sectional view of FIG. In the case of this embodiment, the groove width of the plurality of fuel swirl channels 37 is constant, the groove height is reduced downstream, and the cross-sectional area is reduced downstream. Therefore, when cutting is performed, the processing is easy. The vertical cross section indicated by the arrow in FIG. 26 may be as shown in FIG. In this case, the fuel swirl channel 3
The shape of the groove 7 in the height direction is curved, and the change in the cross-sectional area of the fuel swirl flow path 37 can be arbitrarily set.

FIG. 29 is a cross-sectional view of still another specific example of the fuel swirling member. FIG. 29 is a view of the cross section of the fuel swirling member 8 installed as shown in FIG. 1 as viewed from above. FIG.
0 is a vertical sectional view of the arrow shown in FIG. 29, and FIG. 31 is a side view of FIG. In this example, the plurality of fuel swirl passages 37 are formed in a conical shape, and it is considered that both the groove width and the groove height are narrowed to the downstream side, and the cross-sectional area is reduced to the downstream side. doing. For this reason, when cutting is performed, the processing is facilitated.

FIGS. 32, 33 and 34 are cross-sectional views of still another embodiment of the fuel swiveling member. In the case of the example of FIG. 32, the fuel swirling flow channel 37 can be easily formed by separately forming the flow channel wall member 38 that forms the flow channel and disposing it on the fuel swirling member 8. In the case of FIG. 33, when the fuel swirling flow channel 37 is formed by separately forming the flow channel wall member 38 for forming the flow channel and disposing it on the fuel swirling member 8, the flow channel having the same shape is used. By using the wall members 38 and changing the angle at which they are disposed, it is possible to arbitrarily set the swirling force applied to the fuel flow. In the case of the example of FIG. 34, the flow path wall member 38 that forms the flow path is formed in a curved shape, and the change in the cross-sectional area of the fuel swirl flow path 37 can be arbitrarily set.

FIG. 35 is a transverse sectional view of still another specific example of the fuel swirling member, and FIG. 36 is a longitudinal sectional view of FIG. Immediately before the plurality of fuel swirl channels 37, an annular fuel chamber 39 communicating in the circumferential direction is provided. In the conventional fuel swirling member 8, when the fuel flow flows from the vertical fuel supply path 40 into the fuel swirling flow path 37, the flow direction of the fuel flow changes vertically. Therefore, the vertical fuel supply path 40 and the fuel swirl path 3
At the intersection of 7, a turbulence such as a vortex was generated in the flow, and it reached the inside of the fuel swirl flow path 37. In contrast, in the case of this embodiment, the vertical fuel supply path 40 and the fuel swirl path 37
Since the annular fuel chamber 39 is provided therebetween, turbulence such as a vortex is generated in the annular fuel chamber 39 as schematically shown in FIG. For this reason, when flowing into the fuel swirling flow path 37, the flow becomes almost free of turbulence, and an effect of stabilizing the swirling fuel flow can be obtained.

FIG. 37 is a cross sectional view of still another embodiment of the fuel swirling member. In the case of this example, in order to form the annular fuel chamber 39, the flow path wall member 38 is formed short on the upstream side. Further, the swirling force applied to the fuel flow can be determined by the angle at which the flow path wall member 38 is installed. In this embodiment, since the flow path wall member 38 is formed to be small, any swirling force can be applied. It can be easily set.

FIG. 38 is a transverse sectional view of still another specific example of the fuel swirling member, and FIG. 39 is a partially enlarged view of FIG.
In the case of this example, each of the plurality of fuel swirl flow paths 37 is formed as a groove between the flow path wall members 38, and the walls on both sides of the groove are respectively formed on the tangent line of the annular flow path 41 from which the fuel flows out. is there. Each fuel swirl flow channel 37 has a groove width reduced on the downstream side and a reduced cross-sectional area. Further, since the flow path wall member 38 is formed small, the fuel swirl flow path 3
Immediately before 7, an annular fuel chamber 39 is formed. Due to the fuel chamber 39, the turbulence of the flow of the fuel flowing from the vertical fuel supply path 40 is rectified in the fuel chamber 39, and when flowing into the fuel swirl flow path 37, there is almost no turbulence. Since the cross-sectional area of the passage 37 is reduced on the downstream side, the turbulence of the flow is attenuated by the speed increase in the fuel swirl passage 37, and the turbulence of the flow does not propagate downstream of the fuel swirl passage 37. Therefore, the fuel flow stabilizing effect becomes very large.

[0044]

According to the present invention, the flow is stabilized by the cavity formed stably by the swirling of the fuel flow, and the atomization of the fuel flow injected from the fuel injection hole is stabilized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of an electromagnetic fuel injection valve of the present invention.

FIG. 2 is an enlarged view of a nozzle portion of the embodiment of FIG. 1 when the valve is closed.

FIG. 3 is an enlarged view of a nozzle portion of the embodiment of FIG. 1 when the valve is opened.

FIG. 4 is a longitudinal sectional view of a second embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 5 is an enlarged view of a nozzle portion of the embodiment of FIG. 4 when the valve is closed.

FIG. 6 is an enlarged view of a nozzle portion when the valve is opened in the embodiment of FIG. 4;

FIG. 7 is an enlarged view of a valve body tip portion in a third embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 8 is an enlarged view of a valve body tip portion in a fourth embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 9 is an enlarged view of a valve element tip portion in a fifth embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 10 is an enlarged view of a valve body tip portion in a sixth embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 11 is a longitudinal sectional view of a seventh embodiment of the electromagnetic fuel injection valve of the present invention.

FIG. 12 is an enlarged view of a nozzle portion when the valve is closed in the embodiment of FIG. 11;

FIG. 13 is an enlarged view of a nozzle portion of the embodiment of FIG. 11 when the valve is opened.

FIG. 14 is an enlarged view of a spring portion in the embodiment of FIG.

FIG. 15 is a perspective view of the spring 5 shown in FIGS. 11 and 14;
Electromagnetic fuel injection with flexible tube 19 as bellows 21
It is a longitudinal section of a valve.

16 is an enlarged view of a spring portion definitive in FIG 5.

FIG. 17 is a configuration diagram of a first specific example of an electromagnetic fuel injection device equipped with an electromagnetic fuel injection valve according to the present invention.

FIG. 18 is a configuration diagram of a second specific example of the electromagnetic fuel injection device equipped with the electromagnetic fuel injection valve according to the present invention.

FIG. 19 is a configuration diagram of a third specific example of an electromagnetic fuel injection device equipped with the electromagnetic fuel injection valve according to the present invention.

FIG. 20 is a configuration diagram of a fourth specific example of an electromagnetic fuel injection device equipped with an electromagnetic fuel injection valve according to the present invention.

21 is a perspective view showing an example of a fuel swirl member.

22 is a cross-sectional view showing another example of a fuel swirl member.

FIG. 23 is a vertical sectional view taken along the arrow in FIG. 22.

Figure 24 is a further cross-sectional view showing another example of the fuel swirl member.

FIG. 25 is a vertical sectional view taken along the arrow in FIG. 24;

Figure 26 is a further cross-sectional view showing another example of the fuel swirl member.

FIG. 27 is a vertical sectional view taken along the arrow in FIG. 26;

FIG. 28 is a view showing another example of the vertical section indicated by the arrow in FIG. 26;

29 is a further cross-sectional view showing another example of the fuel swirl member.

30 is a vertical sectional view taken in the direction of the arrow in FIG. 29.

FIG. 31 is a side view of the example of FIG. 29.

32 is a further cross-sectional view showing another example of the fuel swirl member.

33 is a further cross-sectional view showing another example of the fuel swirl member.

34 is a further cross-sectional view showing another example of the fuel swirl member.

FIG. 35 is a further cross-sectional view showing another example of the fuel swirl member.

FIG. 36 is a vertical sectional view taken along the arrow in FIG. 35.

Figure 37 is a further cross-sectional view showing another example of the fuel swirl member.

38 is a further cross-sectional view showing another example of the fuel swirl member.

FIG. 39 is an enlarged view of a fuel swirl flow path portion of FIG. 38.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel supply port, 2 ... Nozzle part, 3 ... Valve element, 4 ... Valve element tip part, 5 ... Spring, 6 ... Valve seat, 7 ... Solenoid, 8
... Fuel swivel member, 9 ... Fuel injection hole, 10 ... Recess, 11 ...
Valve body side positioning member, 12 ... fixed side positioning member, 13
... Flat part, 14 ... Protrusion, 15 ... Circular projection, 16 ... Circular recess, 17 ... Gas supply port, 18 ... Gas flow path, 19 ... Flexible pipe, 20 ... Fuel passage, 21 ... Bellows, 22 ... Injector, 23 ... engine, 24 ... intake valve, 25 ... exhaust valve, 26 ... combustion chamber, 27 ... intake pipe, 28 ... exhaust pipe, 2
9 ... Throttle, 30 ... Fuel tank, 31 ... Fuel pump, 32 ... Control unit, 33 ... Main flow meter, 3
4 ... Auxiliary flow meter, 35 ... Pressure supply source, 36 ... Air cleaner, 37 ... Fuel swirl flow path, 38 ... Flow path wall member, 39 ... Fuel chamber, 40 ... Fuel supply path, 41 ... Circular flow path .

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Oki 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. In-house (72) Inventor Norio Kosuge 2520 Takaba, Katsuta-shi, Ibaraki Hitachi, Ltd. Automotive Equipment Division (56) References JP-A 1-3259 (JP, A) JP-A 55-104564 (JP, A JP-A-54-3615 (JP, A) Japanese Utility Model Laid-Open No. 1-2265 (JP, U) Japanese Utility Model Application Laid-Open No. 2-1464 (JP, U) International Publication No. 90/10153 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02M 61/18 310 F02M 51/08

Claims (7)

(57) [Claims] A fuel swivel member provided upstream of a valve seat for applying a swirling force to supplied fuel; a fuel injection hole provided downstream of the valve seat; and fuel injected from the fuel injection hole. An electromagnetic fuel injection valve that controls the amount of fuel injected by controlling the opening and closing time of the valve body, wherein a recess having a diameter smaller than the diameter of the fuel injection hole is provided at the tip of the valve body. An electromagnetic fuel injection valve characterized by forming: A fuel swirling member provided upstream of the valve seat for applying a swirling force to the supplied fuel; a fuel injection hole provided downstream of the valve seat; and fuel being injected from the fuel injection hole. An electromagnetic fuel injection valve that controls the amount of fuel injected by controlling the opening and closing time of the valve element, wherein at the tip of the valve element, an annular shape having a diameter smaller than the diameter of the fuel injection hole is provided. An electromagnetic fuel injection valve characterized by having a groove formed therein. 3. A fuel swirling member provided on the upstream side of the valve seat to apply a swirling force to the supplied fuel, a fuel injection hole provided on the downstream side of the valve seat, and ejecting fuel from the fuel injection hole. A valve element for controlling the amount of fuel injection by controlling the opening and closing time of the valve element, wherein the valve element has a smaller diameter at the tip of the valve element than the diameter of the fuel injection hole. An electromagnetic fuel injection valve characterized in that a projection whose tip is located upstream of the fuel injection hole is formed when the valve is opened. 4. A fuel swirling member provided on the upstream side of the valve seat to apply a swirling force to the supplied fuel, a fuel injection hole provided on the downstream side of the valve seat, and ejecting fuel from the fuel injection hole. A valve element for controlling the amount of fuel injection by controlling the opening and closing time of the valve element, wherein the valve element has a smaller diameter at the tip of the valve element than the diameter of the fuel injection hole. An electromagnetic fuel injection valve characterized in that when the valve is opened, an annular projection whose tip is located upstream of the fuel injection hole is formed. 5. A fuel swirling member provided on the upstream side of the valve seat to apply a swirling force to the supplied fuel, a fuel injection hole provided on the downstream side of the valve seat, and ejecting fuel from the fuel injection hole. A valve element for causing the valve element to have a fuel injection tip.
Positioned upstream of the injection hole, between the tip and the fuel injection hole
The electromagnetic fuel injection valve for controlling the injection amount of the fuel by providing to form a fuel passage, for controlling the opening and closing times of the valve body between the tip of the valve body, the diameter of the fuel injection hole An electromagnetic fuel injection valve having a smaller diameter and a flat portion formed perpendicular to an axis of the valve body. 6. A fuel swirling member provided on the upstream side of the valve seat to apply a swirling force to the supplied fuel, a fuel injection hole provided on the downstream side of the valve seat, and ejecting fuel from the fuel injection hole. A valve having a diameter smaller than the diameter of the fuel injection hole at the tip of the valve body. An electromagnetic fuel injection valve characterized by forming an injection port. 7. The electromagnetic fuel injection valve according to claim 1 , wherein a plurality of fuel swirl flow paths are provided in the fuel swirl member, and a cross-sectional area of the fuel swirl flow path is downstream. It formed so as to reduce the electromagnetic fuel injection valve, wherein the kite.