JPH02185663A - Fuel injection valve mounting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a mounting device for an electromagnetic fuel injection valve that is used in an electronically controlled fuel injection device for an internal combustion engine and injects fuel into an engine intake system.

<Prior Art> Conventional fuel injection valves of this type include those shown below (see Japanese Utility Model Application No. 168/1983).

That is, the fuel injection valve has a roughly cylindrical outer shape, and is provided with a needle pulp inside which is biased in the valve closing direction by a spring and opened by an electromagnet.

The rear end of the spring is supported by the tip of the spring support shaft, and the spring force is adjusted by positioning the spring support shaft. And, with the 0 ring provided in the middle of the spring support shaft,
Fuel is prevented from leaking from this position to the rear end side.

This fuel injection valve is fitted into the mounting portion of the fuel gear gallery from its tip end, and its rear end portion is pressed and fixed by a cap that covers the opening side of the mounting portion.

Incidentally, the fuel gear gallery is composed of a cylindrical attachment part in which a fuel injection valve is housed and forms a fuel reservoir around the fuel injection valve, and piping that connects each attachment part.

<Problems to be Solved by the Invention> By the way, in such a conventional fuel injection valve, its airtightness (oiltightness), especially the zero
To check the oil tightness of the ring, compressed air is sent through the fuel inlet of the fuel injection valve to check for leaks.

However, when performing an airtight inspection, it is desirable to perform the airtight inspection with the fuel injector attached to the fuel gear gallery as a mounting device, but since the rear end of the fuel injector is sealed with a cap, it is possible to There is a problem in that even if there is a problem with the product (improper installation, omission, etc.), there is a risk of leakage of compressed air being overlooked.

In addition, since the inspection uses compressed air, if you inspect it without a cap, the air pressure will cause the fuel injector to come out.
Attaching the cap is mandatory.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a fuel injection valve mounting device that allows a complete airtight inspection.

Means for Solving the Problems> In order to achieve the above object, the present invention includes a fuel injection valve that is inserted into a mounting part of a fuel gear from its tip, and a cap that covers the opening side of the mounting part to inject fuel. In the fuel injection valve mounting device for press-fixing the rear end of the injection valve, the cap is configured to form a hole for airtightness inspection that communicates the inner and outer surfaces of the cap.

<Function> According to the above configuration, the inner and outer surfaces of the cap communicate through the hole, so if there is an airtightness defect inside,
It becomes possible to catch the leakage from outside the cap.

<Example> An example of the present invention will be described below based on FIGS. 1 and 2.

Referring to FIG. 1, the fuel injection valve 10 includes a cylindrical nozzle holder 12 having a fuel port 11 on the outer periphery, and a tip portion connected and held to the tip portion of the nozzle holder 12 via a stopper plate 13. A nozzle body 15 having a nozzle hole 14, a needle valve 16 slidably housed in the nozzle body 15, a spring 17 that biases the needle valve 16 in the closing direction, and a spring 17 that biases the needle valve 16 in the valve-closing direction. It is equipped with an electromagnet 18 that can be driven in the direction.

The electromagnet 18 includes an iron core 20 placed in the center of the nozzle holder 12 opposite to an iron piece 19 connected to the rear end of the needle valve 16, and an annular space between the iron core 20 and the inner peripheral surface of the nozzle holder 12. It consists of a coil 22 wound around a coil bobbin 21 fitted into the coil bobbin 21.

The spring 17 is supported by the tip of a spring support shaft 23 inserted into the hollow part of the iron core 20, and the spring force is adjusted by positioning the spring support shaft 23 at an appropriate position and fixing it by caulking.

In addition, a groove 24 is formed in the middle of the spring support shaft 23 to ensure airtightness between the spring support shaft 23 and the iron core 20.
A ring 25 is inserted.

Such a fuel injection valve 10 is installed in an intake manifold 26 of an engine.
The fuel filter 29 is inserted into a cylindrical mounting part 28 provided with several cylinders in the middle of a fuel gear gallery 27 (see FIG. 2) fixed to the outer wall of the nozzle holder 12, and the stepped part on the tip side of the nozzle holder 12 12a is locked to the stepped portion 28a of the mounting portion 28,
The rear end of the nozzle holder 12 is pressed and fixed with a cap 31 with a ring-shaped insulator 30 made of rubber interposed therebetween. Furthermore, the cap 31 is formed with a hole 32 for airtightness testing according to the present invention. Note that the hole 32 has a diameter of 2.
Approximately 5 mm is appropriate.

The nozzle holes 14 at the tip of the nozzle body 15 face the intake passages 34 of each cylinder through holes 33 formed through the wall of the intake manifold 26.

Therefore, fuel flows from the fuel gear gallery 27 into the fuel injection valve 10 via the fuel filter 29 and the fuel boat 11, and reaches the inside of the nozzle body 15. Here, coil 2
When the iron core 20 is energized, the iron core 20 attracts the needle valve 16 through the iron piece 19. Then, the needle valve 16
lifts to a position where its flange i6a abuts against the stopper plate 13, and at this time fuel is injected from the injection port 7L14 into the intake passage 34.

During the airtightness test, as shown in FIG. 2, with the fuel injector lO housed in the fuel gear gallery 27 and with the cap 31 attached, one end of the pipe 35 connecting each mounting part 28 is sealed, Compressed air is sent in from the other end to check for air leaks.

At this time, since a hole 32 for airtightness inspection is formed in the cap 31, when compressed air is sent from the fuel filter 29, if the O-ring 25 is missing, the compressed air will be sent to the spring support shaft 23. It passes through the outer periphery of the O-ring 25 to reach the insulator 30 and exits from the hole 32 to the outside of the cap 31, making it possible to detect missing O-rings 25.

As a result, fuel leakage can be completely prevented.

<Effects of the Invention> As explained above, according to the present invention, the inner and outer surfaces of the cap communicate with each other through the hole formed in the cap.
If there is a defect in airtightness inside, it becomes possible to catch the air leakage from outside the cap.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a fuel injection valve and its mounting device showing one embodiment of the present invention, and FIG. 2 is an overall view of the same. IO...Fuel injection valve 23...Spring support shaft 24...Groove portion 25...0 ring 27
...Fuel gear gallery 28...Mounting hole 34...Intake passage 31...Cap Patent applicant Japan Electronics Co., Ltd. Representative Patent attorney Fujio Sasashima 32... Fig. 1 Fig. 2 figure

Claims (1)

[Claims] In a fuel injector mounting device, the fuel injector is inserted into a mounting part of a fuel gallery from its tip end, and the rear end of the fuel injector is pressed and fixed by a cap that covers the opening side of the mounting part, A mounting device for a fuel injection valve, characterized in that the cap is formed with a hole for airtightness inspection that communicates the inner and outer surfaces of the cap.