JPH0634610Y2 - Electromagnetic fuel injection valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electromagnetic fuel injection valve for supplying fuel to an engine.

<Prior Art> As a conventional electromagnetic fuel injection valve for an internal combustion engine, for example, there is one as shown in FIG. 4 (see Japanese Utility Model Laid-Open No. 61-93389).

That is, the electromagnetic fuel injection valve 1 includes a housing 3 having a fuel inlet 2 and a nozzle body 6 that is connected and held to the tip of the housing 3 via a stopper plate 4 and has an injection hole 5 at the tip. A needle valve 7 slidably accommodated in the nozzle body 6;
The housing 3 is attached to an intake manifold (not shown) via a bracket (not shown).

The needle valve 7 is urged to the left in the figure by a spring 10 whose one end is locked to a cylindrical sleeve 9 which is caulked and fixed to the hollow portion of the iron core 8, and the tip of the needle valve 7 is fixed. The seat portion 7a is seated on the seat portion 6a of the nozzle body 6 to close the valve. When the electromagnetic coil 11 held in the housing 3 is energized and the iron core 8 is excited, the iron core 8 attracts the iron joint 12 attached to the needle valve 7, and the needle valve 7
The stopper portion 7b is lifted and opened until it comes into contact with the stopper plate 4.

A fuel passage 13 for guiding the fuel from the fuel inlet 2 is formed in the seat portion 7a of the needle valve 7 in the hollow portion of the iron core 8. A fuel filter 15 is press-fitted into the fuel inlet 14 and the outer periphery is surrounded. Is connected to a fuel pipe 16 connected to the pump. Therefore, the supplied fuel is filtered by the fuel filter 15 and the seat portion 6a of the nozzle body 6 and the needle valve 7 are filtered.
Impurities in the fuel are prevented from being caught between the tip portion and the seat portion 7a.

Here, the fuel filter as described above is press-fitted as described below during the assembly process of the fuel injection valve.

First, after the spring 10 is mounted, the sleeve 9 is inserted into the hollow portion of the iron core 8 so as to lock one end of the spring 10 (see FIG. 5).

Next, for the purpose of fitting the seat portion 6a of the nozzle body 6 and the seat portion 7a at the tip of the needle valve 7, the other end of the sleeve 9 is pressed by the pressing pin 20 to forcibly open the needle valve 7. The "preliminary break-in" step of repeating valve and valve closing is repeated for 20 to 30 minutes (see Fig. 6).

After the end of the “pre-break-in” step, the flow proceeds to the step of adjusting the flow rate of the electromagnetic fuel injection valve 1. That is, the flow rate is adjusted while supplying fuel through the hollow portion 21 formed in the pressing pin 20, and the sleeve 9 is caulked and fixed in the hollow portion of the iron core 8 after the adjustment is completed (Fig. 7). reference).

After the above steps are completed, the fuel filter is installed in the fuel inlet 14 of the iron core 8.
15 is press-fitted (see FIG. 4).

<Problems to be solved by the invention> However, the fuel inlet 14 of the iron core 8 as described above
In the case where the fuel filter is attached to the fuel injection valve, the fuel filter is press-fitted after the pre-conditioning step and the flow rate adjusting step are completed. There is a problem that impurities such as dust enter the inside, which hinders sealing performance and causes malfunction. Further, the number of assembling steps is large, the productivity is deteriorated, and the cost is increased.

In view of such conventional circumstances, the present invention aims to improve the mounting of the filter to reduce the number of assembling steps and improve the workability while maintaining the good sealing performance and operation of the fuel injection valve. .

<Means for Solving the Problems> Therefore, according to the present invention, there is provided a nozzle body which is connected to and held by a tip portion of a housing and has a nozzle hole at the tip portion, and the nozzle body which is slidably housed in the nozzle body. A needle valve seated on the valve seat, a spring for urging the needle valve in the valve closing direction, and a cylindrical magnetic member having a fuel passage formed in the center thereof facing the rear end of the needle valve. A cylindrical sleeve that is attached to the fuel passage of the magnetic member substantially concentrically with the fuel passage and one end of the spring is locked, and a fuel inlet portion formed at a rear end portion of the sleeve. In the electromagnetic fuel injection valve, the filter is mounted in the sleeve.

<Operation> In the above structure, during the assembly process of the fuel injection valve, after the spring is mounted, the sleeve for locking one end of the spring is inserted into the fuel passage formed in the cylindrical magnetic member. To be done. Further, since the sleeve is already fitted with the filter, the fuel flowing from the fuel inlet portion formed at the rear end portion of the sleeve into the fuel passage passes through the filter and flows into the fuel passage. Pre-conditioning and flow rate adjustment will be performed with the filter installed.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. Incidentally, the same elements as those of the conventional example shown in FIG.

1 and 2 show a first embodiment of the present invention.

In the electromagnetic fuel injection valve 30, the iron core 8 as a magnetic member
A sleeve 31 according to the present invention is inserted in the fuel passage 13 of the present invention. In the inner space 32 of the sleeve 31, as shown in FIG.
From both ends 33 and 34, a filter 35 formed of a resin mesh material such as nylon is inserted, and these filters 3
5,35 are held on the sleeve 31 by, for example, metallic filter fixing members 36,37 attached to their respective ends.

Here, in the process of assembling the electromagnetic fuel injection valve 30, the sleeve 31 is inserted after the needle valve 7, the electromagnetic coil 11, the spring 10 and the like are mounted in the housing 3.

Then, the pre-run-in and the flow rate adjustment are performed as described above, and after the end, the sleeve 31 is caulked and fixed in the fuel passage of the iron core
To be done.

Therefore, the fuel flowing into the fuel passage from the fuel inlet 14 passes through the filter 35 and flows into the fuel passage,
Pre-conditioning and flow rate adjustment will be performed with the filter 35 installed in the fuel passage, and the filter 35 inserted into the sleeve 31 when performing pre-conditioning and flow rate adjustment will prevent dust, etc. from entering the fuel injection valve. It is possible to prevent the intrusion of impurities, thereby improving the sealing property and preventing malfunction.

Further, since it is not necessary to additionally install a filter at the fuel inlet 14 of the electromagnetic fuel injection valve 30, it is possible to eliminate the assembly process, reduce the number of processes, and improve workability.

FIG. 3 shows a second embodiment of the sleeve 31 according to the present invention, in which a filter paper-like one-piece type filter 39 is press-fitted into the inner space 32 of the sleeve 31.

Also in this embodiment, the filter 39 press fitted into the sleeve 31.
This prevents impurities such as dust from entering the inside of the fuel injection valve when pre-conditioning or adjusting the flow rate.

<Effects of the Invention> As described above, according to the present invention, a nozzle body that is connected and held at the tip of the housing and has a nozzle hole at the tip, and is slidably housed in the nozzle body. A needle valve that sits on the valve seat of the nozzle body, and a spring that biases the needle valve in the valve closing direction,
A cylindrical magnetic member having a fuel passage formed in the center thereof facing the rear end of the needle valve, and a fuel passage of the magnetic member, which is attached substantially concentrically to the fuel passage and has one end of the spring engaged. In a solenoid fuel injection valve having a cylindrical sleeve to be stopped and a fuel inlet portion formed at a rear end portion of the sleeve, a sleeve equipped with a filter is inserted into a fuel passage, and the rear end portion of the sleeve is inserted. Since the fuel that flows into the fuel passage from the fuel inlet portion formed in the portion passes through the filter and flows into the fuel passage, it is possible to improve the sealing performance of the fuel injection valve and prevent malfunction. The flow rate characteristics can be secured, the number of assembling steps can be reduced, and the workability can be improved, so that the cost can be reduced.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of an electromagnetic fuel injection valve according to the present invention, FIG. 2 is a sectional view showing a sleeve in the same embodiment, and FIG. 3 is a second embodiment according to the present invention. FIG. 4 is a sectional view showing a sleeve, FIG. 4 is a sectional view of an electromagnetic fuel injection valve showing a conventional example, and FIGS. 5 to 7 are partial sectional views for explaining an assembling process according to the conventional example. 3 ... Housing, 7 ... Needle valve, 8 ... Iron core, 10 ... Spring, 13 ... Fuel passage, 30 ... Electromagnetic fuel injection valve, 31 ... Sleeve, 35, 39 ... Filter

Claims (1)

[Scope of utility model registration request] 1. A nozzle body connected to and held at a tip of a housing and having a nozzle hole at the tip, a needle valve slidably accommodated in the nozzle body and seated on a valve seat of the nozzle body, A spring for urging the needle valve in the valve closing direction, a cylindrical magnetic member having a fuel passage formed in the center thereof facing the rear end of the needle valve, and the fuel passage for the fuel passage of the magnetic member. An electromagnetic fuel injection valve having a cylindrical sleeve attached substantially concentrically with which one end of the spring is locked, and a fuel inlet portion formed at a rear end portion of the sleeve. An electromagnetic fuel injection valve, which is equipped with a filter.