JPH0216062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mounting structure for an electromagnetic fuel injection valve having two fuel injection holes.

[Conventional technology]

A fuel injection internal combustion engine uses an electromagnetic fuel injection valve that injects a fixed amount of fuel into an intake passage near a combustion chamber. The mounting structure for this fuel injection valve is, for example, as seen in Utility Model Publication No. 55-26530. The mounting position is important from the viewpoint of atomization of the fuel, and the fuel injection hole is generally set so as to aim at the umbrella part of the intake valve.

By the way, in a fuel-injected internal combustion engine that has multiple intake valves, in order to improve fuel atomization, it is optimal to aim at the head of each intake valve, and a dual-hole type fuel injection valve is It tends to be used.

[Problem that the invention attempts to solve]

However, in the case of a dual-hole type fuel injection valve,
Unlike a single-hole fuel injection valve, it is difficult to set two injection holes on the injection valve axis at the same time, and at least one injection hole must be set at a position eccentric from the injection valve axis. Therefore, if the installation position in the rotational direction around the injector shaft shifts, the fuel from the eccentrically located nozzle hole will not fly in the specified direction determined by the design, which will have a negative effect on fuel atomization. You might end up giving it away. Therefore, in order to prevent incorrect assembly, it is necessary to consider the positioning of the fuel injector, especially the rotation prevention.

Further, in assembling the fuel injector, precision in positioning the nozzle holes is required, which makes the work more difficult.

Therefore, in order to improve the above-mentioned problems, the present invention facilitates the assembly work of a two-way injection valve having two fuel injection holes, and improves the reliability of setting the fuel injection holes in a predetermined direction. The purpose is to improve.

[Means for solving problems]

The mounting structure of the two-way injection valve of the present invention, which meets this purpose, is equipped with two injection holes, and at least one of the injection holes is located eccentrically from the injection valve axis. In a mounting structure in which the other end is inserted into a fuel introduction hole provided in an intake pipe and the other end is inserted into a fuel supply port of a fuel pipe, a protrusion is provided at a position between the two insertion portions on the main body side of the two-way injection valve. The intake pipe is provided with a recess into which the protrusion is fitted and which extends in a direction parallel to the injection valve axis.

[Effect]

In such a mounting structure, the protrusion on the injection valve body side is fitted into the recess provided on the intake pipe side, so rotation of the two-way injection valve is prevented and the two injection holes are aligned in a predetermined direction in the rotation direction. The position can be determined with high precision. In addition, since the recess extends in the axial direction of the injection valve, simply inserting the two-way injection valve into the intake pipe introduction hole will cause the protrusion to be guided into the recess and naturally change the direction of rotation of the two-way injection valve. The position is determined to be a predetermined position. Therefore, assembly work is also facilitated.

〔Example〕

Preferred embodiments of the mounting structure for the two-way injection valve of the present invention will be described below with reference to the drawings.

1 to 3 show a mounting structure for a two-way injection valve according to a first embodiment of the present invention. In the figure, 1 indicates a two-way injection valve. As shown in FIGS. 2A, 2B, and 2C, the two-way injection valve 1 has a connector terminal 2 in the center, and has an injection shaft 3 and a fuel introduction shaft 4 at both ends. Two injection holes 5 and 6 are provided on the end surface of the injection shaft 3 at eccentric positions with respect to the axis 7. On the other hand, the fuel introduction shaft 4 is provided with a fuel hole 8 for supplying fuel to the above-mentioned nozzle holes 5 and 6, and a mounting groove 10 for an O-ring 9 for fuel sealing is provided in the circumferential direction near the end surface. has been done.

The two-way injection valve 1 having the above configuration is as follows:
The 3rd part of the jet shaft, which is the tip on the side of the nozzle hole, is connected to the intake pipe 1.
1, and is inserted into the fuel introduction hole 12 provided in the fuel introduction hole 12 to prevent air leakage from the introduction hole 12.
A ring-shaped grommet 13 is attached to the.

Furthermore, a fuel delivery pipe 14, which is one of the fuel pipes that supplies fuel to the two-way injection valve, is fastened and fixed to the intake pipe 11 with bolts 15. Then, the fuel introduction shaft 4 of the two-way injection valve 1
is inserted into the fuel supply port 16 of the fuel delivery pipe 14.

In the main body 1a of the two-way injection valve 1, a protrusion 17 extending toward the wall surface of the intake pipe 11 is provided at a position between the injection shaft 3 and the fuel introduction shaft 4. On the other hand, the intake pipe 11 is provided with a recess 18 into which the protrusion 17 is fitted and which extends in a direction parallel to the injection valve shaft 7 . As shown in FIG. 3, the projection 17 and the recess 18 are fitted together when one two-way injection valve is assembled.

The operation of the two-way injection valve mounting structure configured as described above will be explained below. First, regarding the assembly of the two-way injection valve 1, the fuel introduction shaft 4 is fitted into the supply port 16 of the fuel delivery pipe 14, and the assembled product is attached to the intake pipe 11. And the injection shaft 3 of the two-way injection valve 1
is inserted into the introduction hole 12 of the intake pipe 11 via the grommet 13 made of an elastic body. Therefore, in the installed state, the two-way injection valve 1 is supported by at least the injection shaft 3 and the fuel introduction shaft 4.

During this installation, the protrusion 17 is fitted into the recess 18 and is guided by the recess 18 extending parallel to the injection valve shaft 7, so that the direction of rotation of the two-way injection valve 1 is The position can be determined naturally and accurately at a predetermined position simply by a movement movement in the insertion direction. After installation, the protrusion 17 is fitted into the recess 18 and held.
The two-way injection valve 1 is prevented from rotating, and the precisely determined positional accuracy in the direction of rotation is maintained as it is.

Therefore, the positions of the nozzle holes 5 and 6 are also precisely determined in a predetermined direction, and the fuel injection direction is directed toward a predetermined intake valve head.

Further, since the grommet 13 is usually made of an elastic material such as rubber, the sealing performance is good, but there is a risk that the supporting position of the ejection shaft 3 may be slightly shifted, which may cause force to be applied to the connector 2. However, in the present invention, since the injection valve main body 1a is also received in the recess 18 via the projection 17, no force is applied to the connector portion 2, and the connection thereof is facilitated.

Next, FIG. 4 shows a second embodiment of the present invention.
In the present invention, the protrusion 19 is provided at a portion with a smaller diameter on the tip end side of the injection valve body 1a. The recess 20 into which the protrusion 19 is fitted is formed in the intake pipe 1.
It is provided near the introduction hole 12 of No. 1.

With this configuration, since the protrusion 19 is provided on the small diameter portion of the main body 1a, the outermost diameter of the main body 1a will not increase even if the protrusion 19 is provided, and the device will be particularly large due to the mounting structure. There's no need. Further, since the distal end side of the two-way injection valve 1 is guided and positioned by the recess 20 when installed, insertion into the grommet 13 of the injection shaft 3 is made easier than in the first embodiment. Other configurations and operations are similar to those of the first embodiment.

Next, FIGS. 5 and 6 show a third embodiment of the present invention. In this embodiment, the injection valve body 1a
Rather than providing a protrusion on itself, a separate member 22 having a protrusion 21 is attached to the injection valve body 1a side, and the intake pipe 11 has a recess 23 into which the protrusion 21 fits.
will be provided. The member 22 is a U-shaped member, as shown in FIG. 6, and is fixed to a portion of the lower part of the connector 2 that has planar portions on both sides.

By making the protrusion 21 a separate member in this way, even if the injection valve 1 itself is the same as the conventional one, rotation can be easily prevented and the position in the rotational direction can be determined.
Note that the member having the protrusion 21 may be in the shape of a band. Other configurations and operations are similar to those of the first embodiment.

[Effect of idea]

As is clear from the above description, according to the present invention, it is possible to easily and accurately prevent the two-way injection valve from rotating and position it in a predetermined direction of rotation, and to set the nozzle hole in a predetermined direction of the intake valve. The effect is that the reliability of the system can be improved.

Furthermore, since predetermined positioning is possible by simply inserting the two-way injection valve, the ease of assembly can be greatly improved.

Furthermore, it is also possible to prevent a large force from being applied to the connector connection portion.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the mounting structure of a two-way injection valve according to the first embodiment of the present invention, Fig. 2A is a side view of the two-way injection valve of Fig. 1, and Fig. 2B is a side view of the two-way injection valve of Fig. 2. FIG. 2C is a rear view of the device in FIG. 2A, FIG. 3 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 4 is a second embodiment of the present invention. FIG. 5 is a vertical sectional view of the mounting structure for a two-way injection valve according to a third embodiment of the present invention, and FIG. 6 is a view of the device shown in FIG. Figure. DESCRIPTION OF SYMBOLS 1...Two-way injection valve, 1a...Main body, 2...Connector terminal, 3...Ejection shaft, 4...Fuel introduction shaft,
5, 6... Injection hole, 7... Injection valve shaft, 11... Intake pipe, 12... Introduction hole, 14... Fuel delivery pipe as fuel piping, 16... Supply port, 1
7, 19, 21... protrusion, 18, 20, 23...
Recessed portion, 22... member.

Claims (1)

[Scope of utility model registration request] A two-way injection valve is provided with two injection holes, and at least one of the injection holes is located eccentrically from the injection valve axis.
In the mounting structure for a two-way injection valve, the other end of which is inserted into a fuel supply port of a fuel pipe, the two-way injection valve has a main body side and a position between the two insertion portions;
A mounting structure for a two-way injection valve, characterized in that a protrusion is provided, and the intake pipe is provided with a recess into which the protrusion is fitted and extends in a direction parallel to the injection valve axis.