JPH04107483U - porous injector - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the reduction in atomization caused by the pressing of the injected fuel against the injection hole wall surface by assist air. [Structure] An adapter 30 of an injector 10 has two injection holes 36 branched from one jet passage 32. The adapter 30 is provided with a first air supply path 38 and a second air supply path 39, the outlets of which are arranged to face each other. The assist air supplied from the outlet of the first air supply path 38 into the jet hole 36 and the second air supply path 3
The assist air supplied into the injection hole 36 from the outlet 9 blows the fuel toward the center of the injection hole 36, thereby preventing the fuel from being pressed against the wall surface of the injection hole 36 and promoting its atomization. be done.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be installed, for example, in a vehicle engine that has multiple intake ports for each cylinder. It is equipped with multiple injection holes each oriented toward each intake port of each cylinder. This invention relates to a multi-hole injector.

0002

[Conventional technology]

This type of prior art is disclosed, for example, in Japanese Utility Model Application Publication No. 1-61461. An example of this is the fuel injection valve. Fuel injection of the second embodiment in this publication The valve is connected to the nozzle 82 of the injector body 81, as shown in cross-section in FIG. A fuel nozzle hole 87 and two nozzle holes 8 that branch the fuel injected from the nozzle hole 87 6, assist air is supplied to the injection hole 86. An air supply path 85 is provided for this purpose.

0003

[Problem that the idea aims to solve]

In the prior art disclosed in the above publication, the number of air supply passages 85 communicating with each injection hole 86 is one. Since there is only one outlet in the book, the injected fuel passing through the injection hole 86 is transferred to the air supply path 8. 5 receives the assist air and presses it against the wall portion 86a of the injection hole 86. There is a problem that the atomization of the injected fuel is impaired.

0004 Therefore, the present invention was devised to solve the above-mentioned problems. The purpose is to reduce atomization by pressing the injected fuel against the injection hole wall using assist air. It is an object of the present invention to provide a multi-hole injector that can improve the underside of the injector.

[0005]

[Means to solve the problem]

The porous injector of the present invention that solves the above problems has the following features: Multiple injection holes branched from one jet passage, and each injection hole has an assist air. In a multi-hole injector comprising an air supply path for supplying air, A plurality of outlets of the air supply path are provided at approximately equal intervals on the circumference of the injection hole. It is something. Further, the plurality of outlets of the air supply path may be arranged near the outlet of the injection hole. .

[0006]

[Effect]

According to the above means, the injected fuel is injected from one jet passage to each injection hole. Assist air is supplied to the injected fuel from its multiple outlets through the air supply path. As a result, the fuel is blown toward the center of the injection hole. In addition, by arranging multiple outlets of the air supply path near the outlet of the injection hole, As a result of the large opening area near the exit of the injection hole, freezing near the exit is also prevented. Prevented.

[0007]

【Example】

An embodiment of the present invention will be described with reference to the drawings. Note that this example is for a vehicle engine. This is applied to the two-hole injector used. Figure 6 shows the injector and The relationship between cylinders and one cylinder of the engine is shown in a cross-sectional view, and a plan cross-sectional view is shown in Figure 7. has been done. 6 and 7, each cylinder 50 of the engine 51 has two intake ports. 52 and one exhaust port 54. The intake port 52 communicates with both intake ports 52. The intake air passage in the bear manifold 56 has a throttle that can open and close the passage. A valve 58 is incorporated. In addition, the wall of the intake manifold 56 has a A two-hole injector that injects fuel individually toward both intake ports 52 of the cylinder 50. 10 is attached.

[0008] A cross-sectional view of the injector 10 is shown in FIG. 4, and its main parts are shown enlarged in FIG. The end view of the adapter with the cap at the tip of the injector 10 removed is shown below. 2, and a sectional view taken along the line III--III in FIG. 1 is shown in FIG. First, figure 4, in the casing 11 of the injector 10 there is a solenoid. A coil 12, a hollow core 14 and an armature 24 are incorporated. this When the solenoid coil 12 is energized, its core 14, armature 24 and front A magnetic circuit is configured in a part of the casing 11. Due to the magnetic force at this time, the - Mature 24 is operated by the elastic force of valve spring 28 together with valve 26, which will be described later. It is slid upward from the illustrated state by a predetermined stroke.

[0009] Further, inside the casing 11, there is a lower part of the armature 24 as shown in the figure. A valve housing 16 is assembled therein. Inside of this valve housing 16 is formed in a hollow space concentric with the hollow portions of the core 14 and armature 24. . As is clear from FIGS. 1 and 3, the lower end of the valve housing 16 has a A nozzle 18 leading to the inside is open, and the inside becomes a valve seat 17. There is.

0010 Furthermore, a valve 26 is incorporated inside the valve housing 16. This valve 26 is fixed to the armature 24 and is as described above. can be slid together with the armature 24. The tip of this valve 26 is usually Due to the elastic force of the valve spring 28, the valve of the valve housing 16 is The nozzle 18 is closed by being pressed against the bushing seat 17.

[0011] In addition, in FIG. 4, a strainer 22 is assembled inside the upper end of the core 14. The hollow part between here and the nozzle 18 serves as a fuel passage for the injector 10. It is road 20.

0012 As shown in FIGS. 1 and 3, the tip of the valve housing 16 (bottom The adapter 30 is fixed to the casing 11 by caulking. There is. Inside this adapter 30, a nozzle 18 of the valve housing 16 is provided. A jet flow passage 32 that communicates with Two injection holes 36 are formed which are branched into two. Both injection holes 36 are Each end face of the adapter 30 is opened. Note that the tip of the adapter 30 has , a disk-shaped cap 45 having an opening hole 37 that matches the injection hole 36 is joined. It is. The openings of both injection holes 36 are as shown in FIGS. 6 and 7. The two intake ports 52 of the cylinder 50 are respectively oriented.

[0013] Furthermore, as shown in FIGS. 1 to 3, the adapter 30 has a The air supply path for assist air supply that penetrates from the 1 (also referred to as an air supply path) 38 are respectively formed. Each first air supply path 38 The outer end opening is located at the proximal end of the adapter 30 as an inlet, and the distal opening is located at the base end of the adapter 30. It has an inclined shape that communicates with the tip of the injection hole 36 as an outlet. Both first air The supply path 38 extends along the radial direction passing through the axis of the adapter 30 and the axis of the injection hole 36. It is formed by

[0014] Further, on the distal end surface of the adapter 30, the openings of the injection holes 36 are arranged to communicate with each other. A groove 39A is formed. The groove 39A is covered by a cap 45 This forms a hollow passage. The opening end of this groove 39A will be described later. The outlet of the second air supply passage 39 faces the outlet of the first air supply passage 38 .

[0015] The adapter 30 includes an assist device located between the first air supply path 38. The air supply path (also referred to as the second air supply path for convenience of explanation) 39 is symmetrical. It is formed in the shape of Each second air supply path 39 has its outer end opening serving as an inlet. It is located at the base end of the adapter 30, and its tip opening communicates with the center of the groove 39A. It is sloped. Both second air supply passages 39 supply the grooves 39A. The radial direction passing through the axis of the adapter 30 and the axis of the injection hole 36 It is formed along the direction perpendicular to. In other words, each of both air supply paths 38 and 39 The outlets are provided on the circumference of each injection hole 36 at intervals of 180°. In addition The arrangement relationship between both air supply passages 38, 39 and the injection hole 36 is shown in a schematic explanatory diagram in FIG. ing.

[0016] An injector including the adapter 30, the cap 45, and a part of the casing 11 The tip portion (lower end portion in the figure) of the holder 10 is shown by a chain double-dashed line in FIGS. 1, 3, and 4, respectively. is inserted into the injector mounting portion 40 of the intake manifold 56 that is There is. The injector mounting part 40 is connected to the casing 11 and the adapter 30. They are assembled in an airtight state with air seals 42 and 44 interposed therebetween, respectively. this The inside of the injector mounting portion 40 communicates with both the air supply paths 38 and 39. An airtight space 46 is constructed. Further, the intake manifold 56 is connected to the air gallery 46 and has an external An air passage 48 is provided that extends in the direction. This air passage 48 is shown in FIG. As shown in FIG. The throttle valve 58 is communicated with the upstream side of the throttle valve 58.

[0017] In the injector 10 configured as described above, energization of the solenoid coil 12 causes Due to the magnetic force generated, the valve 26 moves as shown in FIGS. The valve is opened upward in FIG. 4, and the nozzle 18 of the valve housing 16 is opened. Therefore, the fuel being supplied to the fuel passage 20 is transferred from the nozzle 18 to the adapter 30. The splitter 3 which is a branch part of the two injection holes 36 It is separated into two directions by the top of 4. Note that the top of the splitter 34 has a flat part. By colliding the fuel here, the fuel is divided into two directions and atomized. be able to. In parallel with this, an intake manifold 56 is located inside both injection holes 36. After passing through the air pipe 60, air passage 48 and air gallery 46 due to the pressure difference between , assist air is supplied through both air supply paths 38 and 39.

[0018] Air is supplied from the outlet of the first air supply path 38 into the jet hole 36. The air is injected from its outlet through the second air supply path (including the groove 39A) 39. The assist air supplied into the outlet hole 36 directs the fuel toward the center of the injection hole. The particles are atomized as they are blown toward the surface. Specifically, from the outlet of the first air supply path 38 The assist air causes the injected fuel to reach the wall surface portion of the injection hole 36 on the splitter 34 side. and the assist air from the outlet of the second air supply path 39 Therefore, the injected fuel is pressed against the wall surface portion of the injection hole 36 on the side opposite to the splitter 34. trying to be Therefore, the injected fuel is injected by assist air from both outlets. By being blown toward the center of the hole 36 (see arrow in FIG. 5), the injection hole 36 The particles are not pressed against the wall surface, and their atomization is promoted. In addition, the atomization The injected fuel flows from both injection holes 36 through the opening hole 37 of the cap 45, as shown in FIG. , 7 toward both intake ports 52 of the cylinder 50, as shown by two-dot chain lines, respectively. Once each is injected.

[0019] Further, according to the injector 10, the outlet of both air supply paths 38 and 39 is injected. By arranging it near the outlet of the injection hole 36, the opening area near the outlet of the injection hole 36 is reduced. It can be taken in large quantities. This may occur, for example, in the injection hole 36 in cold regions or during the winter. It is effective in preventing the freezing of water and the formation of so-called icing, and the combustion caused by the icing. Problems such as poor fuel injection are improved.

[0020] An embodiment of the present invention has been described above according to the drawings, and the present invention is based on this embodiment. The invention is not limited to, and includes various embodiments. For example, The assist air guided from the air supply manifold 56 to both air supply passages 38 and 39 is Compressed air using a compressor or the like may be used instead. Also, the outlet of the air supply path is In addition to the two in the example, it is also possible to use three or more. In addition, the intake air of each cylinder 50 There may also be three or more ports 52 and three or more injection holes 36 of the injector 10.

[0021]

[Effect of the idea]

According to the present invention, the injected fuel is injected from one jet passage to each injection hole. Since assist air is supplied from multiple outlets of the air supply path, fuel flows into the injection hole. The injected fuel is atomized while being blown toward the center of the hole, causing the injected fuel to flow toward the center of the hole. Problems such as pressing against surfaces are improved, and fuel atomization is promoted. Furthermore, the plurality of outlets of the air supply path are arranged near the outlet of the injection hole, Freezing near the outlet of the injection hole is prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of an injector.

FIG. 2 is an end view of the adapter with the cap removed.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a sectional view of the entire injector.

FIG. 5 is a schematic explanatory diagram of the flow of assist air.

FIG. 6 is a sectional view of the vicinity of the injector in the engine.

FIG. 7 is a cross-sectional view of the same plane.

FIG. 8 is a sectional view of a main part of a conventional injector.

[Explanation of symbols]

10 Injector 32 Jet passage 36 Injection hole 38, 39 Air supply path

Claims (2)

[Scope of utility model registration request] 1. A multi-hole injector comprising a plurality of injection holes branched from one jet flow passage and an air supply path for supplying assist air to each injection hole,
A multi-hole injector in which a plurality of outlets of the air supply path are provided at approximately equal intervals on the circumference of the injection hole. 2. The multi-hole injector according to claim 1, wherein the plurality of outlets of the air supply path are arranged near the outlet of the injection hole.