JP2553446Y2 - Engine fuel supply - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for an engine which accommodates a plurality of injectors and distributes fuel.

[0002]

2. Description of the Related Art Conventionally, fuel is distributed and supplied by connecting a fuel distribution pipe to an injector provided corresponding to each cylinder of an engine.
As disclosed in Japanese Patent No. 70, there is a technology in which an air passage is provided in the fuel distribution pipe, and auxiliary air is supplied to the fuel injected and supplied by the injector to promote vaporization and atomization of the fuel. It is known.

[0003] For different types of injectors, a structure of a fuel distribution pipe in which an injector case accommodating the injector is provided in parallel and the injector case is connected by a fuel supply passage is also employed.

[0004]

However, in the fuel supply device in which the injector cases accommodating the respective injectors are connected by the fuel supply passage as described above, cracks occur due to mounting errors, vibrations, and the like. Might be.

That is, each injector case is merely connected by the fuel supply passage, and the fuel supply device corrects the error due to the mounting position of the injector in the intake manifold of the engine and the dimensional error of the injector case. The fuel supply passage is subjected to the stress caused by the deformation described above, and furthermore, the fuel supply passage and the injector case are attached to the fuel supply passage according to the fact that the run-out of each injector differs due to engine vibration. There is a problem in that the load is concentrated on the connection portion with the steel and cracks are generated, and the durability is reduced.

Further, since the rigidity of the connection structure between the injector case and the fuel supply passage is increased, it is not necessary to form the fuel supply passage thicker or to dispose the reinforcing ribs in terms of weight increase and compactness. It is disadvantageous and increasing the dimensional accuracy leads to an increase in manufacturing costs.

In view of the above circumstances, the present invention provides an engine fuel supply system in which the rigidity in the connection between the injector case and the fuel supply passage is increased by providing an air passage for assist air for promoting gasification and atomization of the fuel. It is intended to provide a device.

[0008]

In order to achieve the above object, a fuel supply device according to the present invention is provided with a fuel supply passage connecting between a plurality of injector cases accommodating the injectors, and at the center of the injector case in the axial direction. On the other hand, an air passage for connecting the injector cases is formed on the side opposite to the fuel supply passage. Also,
It is preferable that the air passage be formed integrally with the small diameter portion of the injector case.

[0009]

In the fuel supply system for an engine as described above, each injector case is connected by a fuel supply passage, and each injector case is similarly promoted to vaporize and atomize the fuel on the side opposite to the fuel supply passage. By using the air passage for the assist air, the rigidity of the connection between the injector case and the fuel supply passage can be effectively increased, and the movement of the injector case due to vibration can be regulated. Thus, stress due to deformation at the time of mounting acts, and good durability can be ensured and reliability can be improved even if there is an effect of engine vibration. In addition, if the air passage is formed integrally with the small diameter portion of the injector case, the overall size does not increase, and a good engine mountability can be obtained with a composite.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a plan structure of a fuel supply device in a state where an injector according to an embodiment is assembled, FIG. 2 shows a side structure thereof, and FIG. 3 shows a front structure thereof.

In the fuel supply device 10, a plurality of (six in the illustrated case) injector cases 11 are arranged at intervals corresponding to the installation intervals of the cylinders of the engine.
The spaces are connected by a lateral fuel supply passage 12 on one side. Further, the injector case 11
The space is connected by a lateral air passage 13 on the other side opposite to the fuel supply passage 12.

An injector 15 for injecting fuel is accommodated in the injector case 11, respectively.
With the injector 15 housed, the upper opening of the injector case 11 is closed by a cap member 17, and three of the cap members 17 are connected and formed by a connecting member 18, and a coupler 19 is formed from the center of the connecting member 18. Is derived and arranged and connected to each injector 15 to perform fuel injection according to the fuel injection signal. In the fuel supply passage 12,
A mounting bracket 21 is formed.

As shown in the sectional structure of FIG. 4, the injector case 11 has an inner hole 22 at the center thereof into which the injector 15 is inserted from above, and the upper half thereof has a large-diameter portion 11a having a large outer shape. And the lower half is a small diameter part with a small outer shape
11b, and a lower end opening 22a is formed. The fuel supply passage 12 communicates with the inside of the large-diameter portion 11a on one side, and the fuel is pressure-fed. The air passage is provided outside the small diameter portion 11b on the opposite side.
A branch passage 13a is formed from the air passage 13 into an inner hole.
The branch passage 13a is formed so as to be inclined toward the distal end opening 22a.

The fuel supply passage 12 and the air passage 13 are formed in a pipe shape integrally with the injector case 11, and the fuel supply passage 12 and the air passage 13 are connected to an external fuel passage or an air passage 13 by a connector. 24 to 26 are formed and communicate with the respective injector cases 11 in order as described above, so that the supplied fuel and assist air are distributed and supplied.

In the fuel supply apparatus 10 as described above, with the injector 15 assembled as shown in the drawing, the tip end of each injector case 11 is fixed to the injector mounting portion of the intake manifold of the engine, and the bracket 21 is attached. The coupler 19 is attached by being fastened to an intake manifold or the like, the coupler 19 is connected to an engine control unit (not shown), and the passages are connected to the fuel supply passage 12 and the connectors 24 to 26 of the air passage 13, respectively. Then, the fuel pressure-fed to the fuel supply passage 12 is supplied to the inner hole 22 of each injector case 11 and the injector 15
When the valve is opened, the fuel is supplied through the internal passage of the injector 15 from the injection hole at the distal end. On the other hand, air is mixed with the fuel injected from the air passage 13 through the branch passage 13a along with the fuel injection, and the vaporization and atomization of the fuel are promoted.

According to the above-described embodiment, the fuel supply passage 12 is shifted on both sides of the injector case 11 and vertically.
And the air passage 13 are formed integrally with each injector case 11
By connecting the spaces, the overall rigidity is increased irrespective of the increase in wall thickness and the installation of reinforcing ribs, the amount of fluctuation due to engine vibration and the like in the injector case 11 is reduced, and the occurrence of cracks is prevented. Durability and reliability are improved. Further, the fuel supply passage 12 is formed inside the large diameter portion 11a of the injector case 11, and the air passage 13 is formed outside the small diameter portion 11b. It can be set up.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which an injector is assembled to a fuel supply device according to an embodiment of the present invention;

FIG. 2 is a side view of the fuel supply device.

FIG. 3 is a front view of the fuel supply device.

FIG. 4 is a cross-sectional view of an injector case.

[Explanation of symbols]

 10 Fuel supply device 11 Injector case 11b Small diameter section 12 Fuel supply passage 13 Air passage 15 Injector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shirakutsuo 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Yasuomi Tani 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Japan Denso Stock Inside the company (72) Inventor Yumitsu Ogiwara 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References U) Japanese Utility Model Showa 60-100570 (JP, U) Japanese Utility Model Showa 58-167767 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A fuel supply device for an engine, comprising: a plurality of injector cases accommodating an injector; and a fuel supply passage connecting the injector cases to each other. A fuel supply device for an engine, wherein an air passage connecting the injector cases is formed on the opposite side. 2. The fuel supply device for an engine according to claim 1, wherein the air passage is formed integrally with a small diameter portion of the injector case.