JPH051643A - Electromagnetic fuel injection valve - Google Patents

Abstract

PURPOSE:To furnish an electromagnetic fuel injection valve which is superior in promoting atomization and fuel distribution property of a large flow rate of fuel such as methanol fuel. CONSTITUTION:A second split means 20 with a plural number of fuel passage holes 21 larger than a fuel passage hole 18 of a split means 16 on the downstream side of the split means 16 and a blowhole 22 to spirally introduce air from the upstream side of the fuel passage holes 21 is provided on an electromagnetic fuel injection valve for a four-valve engine with the means 16 to split and supply fuel flow from an injection hole 8.

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 capable of distributing and supplying fine droplet fuel to a multi-valve engine having a plurality of intake valves for each cylinder.

[0002]

2. Description of the Related Art In a gasoline engine, various improvements have been made in response to stricter emission regulations and fuel consumption regulations associated with environmental pollution problems. Among them, the four-valve engine is becoming the mainstream, but the four-valve engine has a problem of fuel adhesion to the central partition of the intake port, and the spray characteristics of this type of electromagnetic fuel injection valve are being improved. That is, it is necessary to prevent the fuel from adhering to the central partition wall of the intake valve and to evenly supply the fuel to the two intake ports. Further, in order to purify the exhaust gas, it is necessary to form a homogeneous air-fuel mixture, and it is necessary to have a degree of atomization that can be sufficiently atomized in a short period of time.

On the other hand, although a methanol fuel capable of clean combustion has been considered as an alternative fuel, in this case, since the calorific value is lower than that of gasoline, a large flow rate injection is performed. Therefore, of course, atomization also becomes difficult, and improvement is necessary.

Therefore, the present inventors have conducted a study focusing on atomization of fuel and have advanced the shape optimization of the spray dividing means. Japanese Unexamined Patent Publication (Kokai) No. 2-125956 is representative of this, and a fuel swirl element that is provided on the upstream side of the valve seat and applies swirl force to the supplied fuel, and a fuel that is provided on the downstream side of the valve seat. In an electromagnetic fuel injection valve having an injection hole,
A cross section orthogonal to the valve shaft center is provided at a position symmetrical with respect to the valve shaft center, and is formed by a plurality of circles larger than the diameter of the fuel injection hole and arcs circumscribing the circles between the circles. The fuel dividing means having the fuel passage is provided downstream of the fuel injection hole.

[0005]

In the above-mentioned prior art, the spray from the fuel injection hole is guided and dispersed into the fuel passage larger than the fuel injection hole provided in the dividing means, so that it is limited by the fuel passage wall. It is possible to suppress the atomized fuel from being combined with the unrestricted atomized fuel, and to obtain a relatively good atomized fuel.

However, when atomizing a high flow rate fuel such as methanol fuel, it is difficult to eliminate all spray coalescence, and the conventional structure is not sufficient.

It is an object of the present invention to provide an electromagnetic fuel injection valve which is excellent in accelerating atomization of a large amount of fuel and in fuel distribution performance.

[0008]

The features of the present invention for achieving the above object are a fuel swirl element which is provided on the upstream side of a valve seat and imparts a swirling force to the supplied fuel, and a downstream side of the valve seat. And a plurality of fuel flow injection holes each having a cross section orthogonal to the valve shaft center on the downstream side of the fuel injection hole and symmetrical to the valve shaft center and having a diameter larger than the diameter of the fuel injection hole. In the electromagnetic fuel injection valve having a dividing means formed by the circle of and a circular arc circumscribing the circle between the circles,
A second plurality of circles larger than a plurality of circles of the dividing means, and a cross section thereof which is provided on the downstream side of the dividing means at a position orthogonal to the valve axis at a position symmetrical with respect to the valve axis. The space between the two circles is formed by at least a circular arc circumscribing the circle, and an air hole for introducing air from the outside is provided on the upstream side of the second plurality of circles.

[0009]

The fuel spray ejected from the fuel injection hole through the dividing means goes downstream without being restricted by the passage wall of the fuel passage of the second dividing means. That is, coalescence of the sprays does not occur.

When the spray passes through the second dividing means, air is swirled and introduced from the outside so as to be orthogonal to the spray through a plurality of air holes facing each other provided on the upstream side of the dividing means. .

Therefore, the spray is further atomized by the aerodynamic force. Further, the spray is effectively divided by the air flow, and a good two-way spray can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an enlarged sectional view of a main part showing a second dividing means 20 of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. Further, FIG. 3 is a vertical sectional view of an electromagnetic fuel injection valve having a second dividing means 20 according to the embodiment of the present invention.

The second dividing means 20 is located on the downstream side of the dividing means 16 and is provided with a cross section orthogonal to the valve axis at a position symmetrical with respect to the valve axis. A second plurality of fuel passages 21 that are larger than the passages and a space between each passage 21 is formed by at least an arc that circumscribes the passage. Further, a plurality of air holes 22 for introducing air from the outside are provided on the upstream side of the passage 21, the air holes 22 are arranged so as to face each other, and are provided eccentrically with respect to the axial center of the passage 21. ing. Reference numeral 23 is an air reservoir formed between the inner wall 23a of the second dividing means and the outermost wall of the valve guide 7. Further, 24 is a pipe for guiding air from the outside to the air reservoir 23.

FIG. 3 is a longitudinal sectional view of an electromagnetic fuel injection valve 1 (hereinafter referred to as an "injection valve") having a second dividing means 20 according to the first embodiment of the present invention. The injection valve 1 is for injecting and supplying fuel by opening and closing the seat portion in accordance with a duty on / off signal calculated by a control unit (not shown). The electric signal is given to the coil 2 as a pulse, and when a current is passed through the coil 2, a magnetic circuit is constituted by the core 3, the yoke 4 and the plunger 5, and the plunger 5 is attracted to the core 3 side. When the plunger 5 moves, the ball valve 6 integrated with it moves away from the seat portion 9 of the valve guide 7 and opens the orifice 8. The ball valve 6 includes a rod 10 joined to one end of a plunger 5 made of a magnetic material, and a rod 1
Ball 11 welded to the other end of 0 and plunger 5
The guide ring 12 made of a non-magnetic material is fixed to the upper opening of the valve guide 7 and the inner peripheral surface of a cylindrical fuel swirl element 13 inserted and fixed to the inner wall of the hollow portion of the valve guide 7. In addition, the stroke amount when moving is the rod 1
It is determined by the size of the gap between the receiving surface 10a of the neck portion of 0 and the stopper 14. On the other hand, the valve guide 7
A cylindrical portion 15 extending in the direction opposite to the seat surface is formed on the inner surface of the sheet, and a dividing means 16 is shown which is inserted and fixed to the inner wall. The dividing means 16 is provided with a fuel passage 17 having a diameter slightly larger than that of the orifice 8 of the axial center, and two large diameter fuel passages 18 arranged in parallel and at equal intervals with respect to the passage 17, and each passage is provided. The passage 17 at the center of the shaft is communicated with the communication wall 19.

Downstream of the dividing means 16, a second dividing means 20 is fixed by being guided and inserted by the inner wall of the tubular portion 15 and the outermost wall of the valve guide 7.

The injection and supply of fuel from the injection valve 1 will be described.

The fuel is pressure-adjusted by a fuel pump or a fuel pressure regulator (not shown), flows into the solenoid valve assembly through the inflow passage 26 through the filter 25, and the outer periphery of the plunger 5, the clearance between the stopper 14 and the rod 10. , Is swirlingly supplied to the seat portion through the fuel swirling element 13, and is injected from the orifice 8 when the valve is opened. The atomized fuel flows into the dividing means 16 below the orifice 8, but is split by the communication wall 19 in the fuel passage 17 which is slightly larger than the orifice 8.
Further, the fuel is introduced into the large-diameter fuel passage 18. At this time, coalescence of the spray droplets is suppressed, and atomization of the fuel proceeds.

Then, the second dividing means 20 according to the present invention.
Leading to. Here, the fuel flow in the second dividing means 20 will be described with reference to FIGS. 1 and 2 again.

When the spray flows into the second plurality of fuel passages 21 provided in the second dividing means 20, the pipe 24 and the air reservoir 23 are externally provided in the air holes 22 provided on the upstream side of the fuel passage 21. Air is sent in through. The air that has passed through the air holes 22 is orthogonal to the spray, and the fuel passage 2
Since the swirl is given within 1, the atomization of the fuel is further promoted by the swirl force. Further, since the air holes 22 are provided so as to face each other, the separation of the spray is also forcedly performed here.

Therefore, the atomized fuel that has passed through the second dividing means 20 is extremely excellent in atomization and distribution performance, and is suitable for atomizing a large flow rate fuel such as methanol fuel.

4 and 5 show another embodiment according to the present invention. FIG. 4 is an enlarged sectional view of an essential part showing the second dividing means 30, and FIG. 5 is a direction B in FIG. It is a perspective view. In the present embodiment, the fuel passage 31 provided in the dividing means 30 is configured so as to join on the upstream side of the dividing means 30 and branch on the downstream side, and an air hole 32 for introducing air from the outside is formed on the upstream side. It The air hole 32 is eccentric with respect to the axial center of the fuel passage 31. 33 is an air reservoir formed by the inner wall 33a of the dividing means 30 and the outer wall of the valve guide 7, 34
Is a pipe for guiding air to the air reservoir 33 from the outside.

Now, when the jet flow from the first dividing means 16 flows into the second dividing means 30, the jet flow is partitioned and separated at the confluent portion of the fuel passage 31. After that, the fuel flows to the downstream side of the branched fuel passage 31. During this flow, the pipe 3 is introduced from the outside into the air hole 32 provided on the upstream side of the fuel passage 31.
4, air is sent through the air reservoir 33. The air that has passed through the air holes 32 is orthogonal to the spray and is given a swirl, so that the swirling force further promotes atomization. It is explained that the effect in this embodiment is equivalent to the effect in the first embodiment.

FIG. 6 shows an electromagnetic fuel injection valve 1 according to the present invention.
It is a schematic diagram of a configuration of an engine control system equipped with. Further, FIG. 7 is a diagram showing a mounting state of the electromagnetic fuel injection valve.

In FIG. 6, the engine 100 is a DOH.
In a partial cross-sectional view of the C engine, an intake manifold 120 including a throttle valve, an intake hole 130, an intake valve 140 opening and closing the intake hole 130, an ignition plug 15
According to the present invention, which is attached to the wall portion of the intake manifold 120 upstream of the combustion chamber 160 and the intake valve 140, which are arranged facing 0, and is arranged so as to be able to inject toward the valve seat 140a of the intake valve 140. A fuel injection valve 1 is shown.

FIG. 7 shows the positional relationship between the fuel injection valve 1 and the intake valve 140. The fuel injection from the injection valve 1 is divided into two directions so as not to collide with the partition wall 140b of the intake valve 140. .. In addition, 180 shows an exhaust valve.

The operation of the engine 100 is performed by the control unit 170 processing the water temperature of the partition wall of the combustion chamber 160, the intake air amount, the air temperature, the engine speed, etc. The fuel injection of the fuel injection valve 1 is based on the signal of this control unit.

The fuel injection of the fuel injection valve 1 is effectively performed by the air supplied to the injection valve 1. Although the air supply source is not shown in the present embodiment, for example, upstream of the throttle valve 110. Side and throttle valve 110
A method of supplying by differential pressure before and after, a method of forcibly supplying air by an electric air pump, or a method of supplying exhaust gas can be considered.

The mixture of fuel and air is introduced from the intake hole 130 of the engine 100 to the combustion chamber 160, compressed in the compression process, and then ignited and burned by the ignition plug 150. As a result of the combustion test, as compared with the conventional type (pintle valve), the hydrocarbon emission amount is 2
000 rpm, load is WOT (4/4), CO concentration is 5% constant, ignition timing is 10 ° (BTDC), reducing effect 2
The effect is 7% (water temperature 80 ° C) and the reduction effect is 35% (water temperature 40 ° C).

[0030]

EFFECTS OF THE INVENTION According to the present invention, a large amount of jetted fuel is effectively divided and supplied in two directions to obtain atomized fuel having an extremely excellent atomized particle size, and it can be applied to a four-valve engine. Can provide a valve.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing a second dividing means according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a longitudinal sectional view of an electromagnetic fuel injection valve having a second dividing means of the present invention.

FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the second dividing means according to the present invention.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an explanatory view showing a part of an internal combustion engine using an electromagnetic fuel injection valve according to the present invention.

FIG. 7 is an explanatory view showing the positional relationship between the fuel injection valve and the intake valve of the present invention.

Claims (1)

Claim: What is claimed is: 1. A fuel swirl element provided upstream of a valve seat for imparting swirling force to supplied fuel; a fuel injection hole provided downstream of the valve seat; A cross section orthogonal to the valve shaft center is provided on the downstream side of the fuel injection hole at a position symmetrical with respect to the valve shaft center, and between a plurality of circles larger than the diameter of the fuel injection hole and the circle. In an electromagnetic fuel injection valve having a dividing means formed by an arc circumscribing the circle, a cross section orthogonal to the valve axis on the downstream side of the dividing means is symmetrical with respect to the valve axis. A second plurality of circles which are provided at a position and are larger than a plurality of circles of the dividing means, and an arc which circumscribes at least the circle between the circles, and has a second dividing means, An air hole for introducing air from the outside was provided on the upstream side of the two or more circles. An electromagnetic fuel injection valve characterized by the above.