JPS5939965A - Fuel injection valve for internal-combustion engine - Google Patents

Abstract

PURPOSE:To even injection distribution by providing 2-stage injection of a fuel injection valve comprising a wide angle injection nozzle and a small wide injection nozzle. CONSTITUTION:A plate 22 and a first nozzle 23 are mounted on an end of a core 20 by caulking or other proper means. A space surrounded by the inner surfaces of the plate 22 and the first nozzle 23 forms a first volute chamber 24. A second nozzle 27 is closely attached to the underside of the first nozzle 23, and a space surrounded by the inner surfaces of the first and second nozzles 23, 27 forms a second volute chamber 28. The lower end wall of the second nozzle 27 is provided with a wide angle injection port 30 directed downward, and the first nozzle 23 is converged toward the lower end side while being provided on the lower end wall with a narrow angle injection port 31 directed downward.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection valve for a multi-cylinder internal combustion engine, which injects fuel into an intake pipe when starting the engine to improve startability.

Generally, in cold weather when the cooling water temperature is below the set value, the atomization characteristics of fuel are not good, so a starting fuel injection valve is used to inject fuel into the intake pipe to enrich the mixture. ing.

This type of fuel injection valve is installed in the upstream collecting pipe section of the intake pipe that connects to each cylinder of the engine, in order to distribute and distribute an increased amount of fuel to each cylinder of a multi-cylinder internal combustion engine. For this reason, the fuel injection valve described above is required to inject fuel equally to each cylinder. However, are the intake pipes of a multi-cylinder internal combustion engine connected to each other? 'a' were arranged in parallel so as to be on the same plane, whereas the fuel injection valves were arranged in the center of the collecting pipe section. For this reason, a large amount of fuel is supplied to the intake pipes close to the injection valves, but less fuel is supplied to the intake pipes outside in the 31ν row direction, and there is a problem that the air-fuel mixture is not distributed evenly into the cylinders. 0 For this reason, the fuel injection area of the fuel injection valve is widened by making the injection hole of the fuel injection valve large in diameter and widening the spray angle. It is conceivable to increase the supply of fuel to the tube.

However, if the diameter of the injection hole is made large and the angle of injection is narrowed, a wide fuel injection area can be secured;
As the spray angle becomes larger, the injection amount distribution in the fuel injection area will be reduced, as shown in FIG. 5a, at the center of the fuel injection area. For this reason, in this case, conversely, fuel is not supplied to the intake pipe at the center in the parallel direction, and it is difficult to evenly distribute the air-fuel mixture into the cylinders.

The present invention was made based on the above circumstances, and its object is to provide a fuel injection tank for an internal combustion engine that can satisfactorily equalize fuel distribution to each cylinder.

That is, this invention has an injection hole provided in a fuel injection valve that is a wide-angle injection hole that injects fuel over a wide area, and that is directed toward the center of the fuel injection area of the wide-angle injection hole, and that also produces a small spray than the wide-angle injection hole. It is composed of a narrow-angle injection hole having a corner, and attempts to achieve the above object by combining fuel injection from both of these injection holes.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, 1 is a multi-cylinder internal combustion engine in which cylinders are arranged in series, and 2... are dedicated intake pipes from each cylinder. The intake pipes 2 are arranged side by side along the axial direction of the engine 1, and the upstream sides of these intake pipes 2 are communicated with the collecting pipe section 3.

An air purifier 4 is connected to the central part of the collecting pipe part 3, and air is inhaled into the common cylinder of the engine 1 through the nitrogen purifier 4 from the central part of the collecting pipe part 3. -C air is now supplied.

A fuel injection valve 5 according to one embodiment is installed in the medium heat section of the joint pipe section 3, and the configuration of this fuel injection valve 5 will be explained below with reference to FIGS. 2 to 4. explain. In FIG. 2, reference numeral 10 denotes a sylanger, and a valve 1 which moves integrally with the sylanger 10 is attached to one end thereof. The plunger 10 is not made of a magnetic material, and the valve 11 is made of an elastic material such as rubber. The pulp 11 is pressed by a spring J3 and comes into close contact with the sheet 12a of the connector 12, which forms a fuel supply passage 41+7. Reference numeral 14 denotes a terminal, which is a one-way terminal connected to the electromagnetic coil 15. The electromagnetic coil 15 is wound around a bobbin 16 which is a non-repaired 1/1 body, and the silane gloss 10 is moved inside the bobbin 16. In addition'
The magnetic coil 15 is covered by a cover 17.

A filter 18 is housed inside the connector 12 via a holding frame 19.

Still, 20 is a core, and a fuel passage 21 is formed inside this core 20. This fuel passage 21 is connected to the core 2
It is formed along the axial direction of 0 and constitutes a fuel passage.

An annular plate 22 and a first nozzle 23 are attached to the tip of the core 20 by caulking or other means. A space surrounded by the inner surface of the grate 22 and the nozzle 23 of the funeral 1 forms a first spiral chamber 24, and a first fuel introduction hole 25 is formed in the side wall of the route 22. has been done. One end of the first fuel introduction hole 25 communicates with the fuel passage 21, and the other end communicates with the first swirl chamber 2.
It is opened at 4. That is, the outer circumferential surface of the grate 22 is machined with a 2th flat surface as shown in FIG. Outer passage 2 communicating with hole 25
6 is formed. Still, as shown in FIG. 4, the first fuel inlet hole 25 extends 1iijI into the first volute chamber 24 in the tangential direction thereof.

A second nozzle 27 is disposed in close contact with the lower side of the first nozzle 23, and this second nozzle 22 is also attached to the tip of the core 20 by caulking or other means. It is being The space surrounded by 1h1 of the first and second nozzles 23 and 27 forms a second spiral chamber 28, and a second spiral chamber 28 is formed on the side wall of the second nozzle 27. A fuel introduction hole 29 is already formed. This second fuel inlet hole 29 also has one end facing into the fuel passage 2 and the other end facing into the winding chamber 28 in the tangential direction thereof. It has been opened 1-1 and 4). In other words, the first
Also, between the outer peripheries of the second nozzles 23 and 2, similar to the J-sliding of the above-mentioned nozzle rate 22, a flattening process is applied on two surfaces, thereby creating a communication path that connects to the communication path 26. (Figure) J < C is formed and -C is present.

A wide-angle injection hole 30 is downwardly enclosed 8 in one T-section of the second nozzle 27. This wide-angle injection hole 3
0 is formed with a large diameter opening, so that a large fuel injection area can be secured.

On the other hand, the l-th nozzle 23 has a lower part 9 ha (1111 mm) tapering toward the lower blade, and is raised to the center of the wide-angle injection hole 30, and one end wall thereof has a narrow-angle injection Hole 3 is opened downward. The narrow-angle injection hole 3 is set to inject fuel toward the medium flame part of the fuel injection area from the wide-angle injection hole 30, and the spray angle α is set to the wide-angle injection hole 3υ. The spray angle β is also set small. Note that 32 and 3.9 are O
It is a ring.

Next, the operation will be explained in one embodiment of the above configuration.

At the time of starting, such as during cooling when the cooling water temperature is below a set value, the electromagnetic coil 15 is energized through the terminal 14 at the same time as the 1fI power is supplied to the starter. Due to this energization, an attractive force acts on the electromagnetic coil 15, and the granger 10 is pulled toward the core 20 against the pressing force of the spring 13. As a result, the valve 1 is separated from the seat 12a, and the fuel introduced into the connector 12 at a constant pressure is filtered again by the filter 18, and then passes through the gap between the seat 128 and the pulp 1. 71- Inside bin 16 &su,
entered. Further, the fuel flows into the first and second swirl chambers 24, 28 through the fuel passages 2 of the core 10, which are separated by the gap between the bobbin 16 and the fuel tank 10. In the second swirl chamber 24.211, the first and second fuel inlet holes 25.29 are formed in the direction of tangential force, so that the fuel forms a swirling flow. Then, the first and second fli'
The fuel swirls in the 6th volume chamber 24.28 and the fuel flows through the first and second
The liquid is injected into the aggregated bone portion 3 from the narrow-angle injection hole 31 and the wide-angle injection hole 30 provided in the nozzles 23 and 27, respectively.

In this case, since the wide-angle injection hole 30 is opened to a diameter of 10 mm, a wide fuel injection area can be ensured, and the fuel injection distribution of the wide-angle injection hole 30 is shown by a in FIG. 5 as described above. - The narrow-angle injection hole 3 injects fuel toward the center of the fuel injection area in the wide-angle injection hole 30, and its spray angle α is also smaller than the spray angle β of the wide-angle injection hole 30. Therefore, the fuel injection distribution becomes a substantially conical distribution as shown in FIG. 5. Therefore, the above injection distribution a
In the fuel +11 injection from only the wide-angle two-way injection hole 30 shown in , a large amount of fuel is supplied only to the outside of the intake pipe 2, as described above. By combining the injection distribution of the narrow angle injection holes 3 with the injection distribution a, the overall injection distribution can be made uniform as shown by C in FIG. Therefore, fuel can be sufficiently supplied not only to the intake pipe 2 located away from the fuel injection valve 5 but also to the intake pipe 2 located near the injection valve 5. can be distributed evenly.

In the above embodiment, the narrow-angle injection hole 31 was configured to slightly protrude from the wide-angle injection hole 30, but the present invention does not rest on this, and for example, as shown in FIG. The hole 31 may open into the spiral chamber 28 of the wide-angle injection hole 3σ. In addition, the holes 1-11 of the wide-angle injection hole 30 are not limited to a perfect circle, and may be formed in a shape of 1h along the intake pipe 2... A circular shape is also good.

As explained above, in this invention, the injection of the fuel injection valve is made into a two-stage injection consisting of a wide-angle injection hole and a narrow-angle injection hole.
By combining the 19'X radiation distributions of these injection holes, the entire injection distribution can be made uniform. Therefore, since fuel can be evenly distributed to each intake pipe, variations in starting performance between cylinders are eliminated, resulting in a smooth and reliable engine start.
Jth becomes possible.

[Brief explanation of the drawing]

Figures 1 to 8pJ5 show an embodiment of the present invention,
Figure 1 is a schematic diagram of a multi-cylinder internal combustion engine, Figure 2 is a sectional view of a fuel injection valve, Figure 3 is an enlarged view of section 111 in Figure 2, and Figure 4 is taken along line IV-IV in Figure 3. 5 is a fuel injection distribution characteristic diagram of the injection valve, and FIG. 6 is a sectional view of the tip of the core showing another embodiment.ノ...Multi-cylinder internal combustion engine, 2...Intake part, 3...Collecting pipe section, 10...No.0 ginger, 15...Paper magnet coil, 20...Core, 21... Fuel passage, 24, 21
3...Vortex chamber, 30...Wide-angle injection hole, 3...Narrow-angle injection hole, Applicant's representative Patent attorney Suzue Take Fuji-Kiyoshi Pi Zuko 2 Figure 73m 21 Warehouse A1 Gourd Figure 114 p619R 1

Claims (1)

[Claims] It is installed in the collecting pipe part of the intake pipe connected to each cylinder of a multi-cylinder internal combustion engine, and the FI electric current to the coil activates the granger placed inside the coil, which injects fuel into the fuel passage provided in the υ core. In the fuel injection valve, the fuel is guided to a volute chamber provided in the core and communicated with the fuel passage, and is injected from an injection hole opened in the volute chamber. The chamber is divided into two chambers, and one volute chamber has a wide-angle injection hole that injects fuel over a wide area, and the other volute chamber has a wide-angle injection hole that directs the fuel injection area of the wide-angle injection hole toward the middle fire part, and A fuel injection valve for an internal combustion engine characterized by having a narrow-angle injection hole that injects fuel at a smaller injection angle than a wide-angle injection hole.