JPH0735009A - Fuel injection device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to easily fix the fuel injection valve 5 to the injector housing 2 of the fuel gallery 1. [Structure] A fuel injection valve 5 fitted and arranged in a substantially cylindrical injector housing 2 has a disk-shaped first and second disc-shaped base.
It has electrode plates 14 and 15, and a connector 17 for connecting a harness is mounted on the electrode plates 14 and 15 so as to slide laterally. The terminal piece 2 is placed in the engagement grooves 21 and 22 of the connector 17.
3, 24 are provided. A locking portion 19 having a guide piece 19a is provided at the opening edge of the connector 17, and the locking portion 19 is attached to the connector by strongly pressing the connector 17 together with the fuel injection valve 5 toward the injector housing 2. It is fitted with the flange portion 4 for use and firmly fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fuel injection system for an internal combustion engine, which has an electromagnetic fuel injection valve for each cylinder.

[0002]

2. Description of the Related Art As a fuel injection valve for an internal combustion engine, a so-called side feed type fuel injection valve having a fuel inlet on its side surface is
A plurality of injector housings having a substantially cylindrical shape are formed at a plurality of positions in the fuel gallery, and fuel injection valves having upper and lower seal rings are fitted and mounted therein, and fixed and held by caps bolted to the fuel gallery. Has become. The fuel injection valve is, for example,
As disclosed in Japanese Patent No. 1277773, etc., it has a substantially rectangular connector portion that extends obliquely from the base portion, and an electrical connection is made by inserting a connector at the end of the harness into the connector portion. Has become.

[0003]

However, in the above-mentioned conventional structure, in order to fix and hold the fuel injection valve in the injector housing, it is necessary to screw substantially semicircular caps to the fuel gallery respectively. There is a drawback that the assembly work is troublesome. Even if the injection pattern does not have a particular directionality as a fuel injection valve, such as a circular pattern centered on the center axis of the injection valve, the connector portion protruding from the cap is aligned in a fixed direction. Must be done, and workability is even worse.

[0004]

SUMMARY OF THE INVENTION A fuel injection device for an internal combustion engine according to the present invention is an injector housing formed in a fuel gallery, an electromagnetic fuel injection valve fitted and arranged in the injector housing, and the injector described above. The connector mounting flange formed on the opening edge of the housing, the plate-like electrode plate provided on the base of the fuel injection valve, and the engagement groove into which the side edge of the electrode plate can be inserted face inward. A substantially U-shaped connector provided with an engaging portion for holding the connector mounting flange portion at the opening edge, and an engaging groove of the connector disposed so as to be electrically connected to the electrode plate. And a terminal piece.

According to the second aspect of the present invention, the electrode plate is formed in a disc shape, and a linear portion is cut out in a part of the electrode plate corresponding to the injection direction of the fuel injection valve. The dimension of the engaging groove was set so as to match, and a linear portion was cut out in a part of the flange portion so that the connector mounting flange portion and the connector could be fitted only at a predetermined angle.

[0006]

In the above construction, the connector is slidably mounted on the electrode plate of the fuel injection valve, the fuel injection valve is inserted into the injector housing, and at the same time,
Press the locking part of the connector into the connector mounting flange of the injector housing. As a result, the connector is engaged and fixed to the connector mounting flange portion. That is, by mounting the connector for harness connection to the injector housing, the fuel injection valve is fixed and held, and the electrical connection between the terminal piece and the electrode plate is achieved.

When the electrode plate is formed in a disc shape and the linear portion is cut out in a part of the electrode plate and the connector mounting flange portion, the fuel injection valve is positioned in the rotational direction. Is done.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

3 and 4 show a fuel gallery 1 which constitutes a fuel injection device for a multi-cylinder internal combustion engine. The fuel gallery 1 has a plurality of injector housings 2, and the injector housings 2 are sequentially connected by a metal pipe 3. One end of the fuel gallery 1 serves as a fuel inlet, and the other end is equipped with a pressure regulator (not shown) for adjusting fuel pressure.

The injector housing 2 has a substantially cylindrical shape with an open upper surface, and has a tapered portion 2a at the lower end.
And an opening 2b having a relatively small diameter is formed in the center thereof. In addition, this injector housing 2
A connector mounting flange portion 4 is formed in an annular shape on the outer circumference of the opening edge.

5 and 6 show an electromagnetic fuel injection valve 5 mounted on the injector housing 2. The fuel injection valve 5 includes a housing portion 7 having a solenoid 6 therein, a nozzle body 9 having an injection hole (not shown) at its tip, and a needle 8 slidably fitted in the center thereof.
It is roughly composed of a synthetic resin cap portion 10 molded so as to cover the base end portion of the housing portion 7, and a fuel intake port 11 is provided on the side surface of the housing portion 7 and sandwiches the upper and lower portions thereof. As described above, the seal rings 12 and 13 are attached. In addition, the cap portion 1
At 0, a first electrode plate 14 and a second electrode plate 15 which are electrically connected to the solenoid 6 are arranged vertically. This first
The second electrode plates 14 and 15 are disc-shaped concentric with the central axis of the fuel injection valve 5, have the same diameter as each other, and are fixed such that the outer peripheral edges thereof protrude from the shaft portion of the cap portion 10. ing.

7 and 8 show a connector 1 attached to the tip of the harness 16 for connecting to the fuel injection valve 5.
7 is shown. The connector 17 has an injection valve stopper 18 formed by bending a metal plate into a substantially U shape, and has an engaging portion 19 formed by bending inward so as to face each other at an opening edge thereof. It is provided. The locking portion 19 has a gap slightly narrower than the diameter of the connector mounting flange portion 4 of the injector housing 2 described above, and a guide piece 19a is formed on the lower edge thereof in a diagonally downward direction. Locking claws 19b are folded back inward at both front and rear ends thereof. A pair of left and right rubber bodies 20 are fixed to the inside of the injection valve stopper 18 having a substantially U-shape, and the first and second engagement grooves 21 and 2 composed of a pair of left and right concave grooves are provided therein.
2 is formed in upper and lower two stages. The first and second engagement grooves 21 and 22 are provided in the first and second electrode plates 14 of the fuel injection valve 5,
The size and the forming position are set so that 15 can be fitted with each other. Then, terminal pieces 23 and 24 are provided on the inner side surfaces of the engagement grooves 21 and 22 so as to be electrically connected to the electrode plates 14 and 15, respectively. The terminal piece 23 of the first engaging groove 21 is arranged in one of the left and right concave grooves, and the terminal piece 24 of the second engaging groove 22 is arranged in the other.

FIG. 1 shows the assembling state of the fuel injection valve 5 and the connector 17 respectively configured as described above to the injector housing 2, and FIG. 2 shows the assembling procedure. That is, first, the connector 17 for connecting the harness 16 is attached to the fuel injection valve 5 configured as described above. Specifically, as shown by arrow A in FIG. 2, the connector 17 is slid in the radial direction of the fuel injection valve 5 so that the first and second electrode plates 14 and 15 are connected to the first and second electrodes of the connector 17. 2 Engage with the engagement grooves 21 and 22.
As a result, the terminal pieces 23, 24 are brought into contact with and conductive with the electrode plates 14, 15, respectively. At this time, the fuel injection valve 5
The connector 17 can be mounted in any orientation without any directionality.

Then, the fuel injection valve 5 is inserted into the injector housing 2 as shown by arrow B in FIG. 2, and at the same time, the connector 17 is attached to the connector mounting flange portion 4 of the injector housing 2 by arrow B. Press firmly along. As a result, the locking portion 19 elastically opens to the right and left due to the inclination of the guide piece 19a, and the connector mounting flange portion 4 engages with the inside of the connector 17. In this engaged state,
As shown in FIG. 1, the locking portion 19 is located along the lower surface of the connector mounting flange portion 4 and holds the flange portion 4 from both sides. Even when this press-fitting is performed, it is not necessary to consider the directionality of the fuel injection valve 5.

As described above, by press-fitting the connector 17, the connector 17 itself is firmly attached to the injector housing 2, and the fuel injection valve 5 inserted into the injector housing 2 is securely fixed.
Retained. In this mounted state, the upper and lower seal rings 12 and 13 of the fuel injection valve 5 are pressed against the inner peripheral surface of the injector housing 2 to perform sealing. In addition, the electrode plates 14 and 15
The rubber body 20 is interposed between the connector and the metal portion of the connector 17, and vibration transmission from the fuel injection valve 5 is suppressed.

As described above, in the structure of the above embodiment, the connector 17 for connecting the harness 16 can easily fix the fuel injection valve 5 to the injector housing 2, and the assembling work thereof is extremely simple. Becomes In addition, the fuel injection valve 5 has no directivity, and the assembling work can be performed without considering the directivity, so that the efficiency is further improved.

When it is necessary to remove the fuel injection valve 5 for inspection or the like, the connector 17 is slid in the radial direction of the fuel injection valve 5 while pushing the locking claw 19b of the locking portion 19 to the left and right. Then, the connector 17 is disengaged from the injector housing 2 and the fuel injection valve 5, and the fuel injection valve 5 can be pulled out.

Next, FIGS. 9 to 13 show different embodiments of the present invention.

This embodiment is an example in which the present invention is applied to a fuel injection valve 5 having a specific directionality, such as a two-way injection type fuel injection valve used in an intake two-valve internal combustion engine. 9, as shown in FIG. 10, the first and second electrode plates 1
A part of 4, 15 has linear portions 14a, 15a in a substantially V shape.
Is cut out. The straight portions 14a and 15a are
It is provided at a fixed position so as to correspond to the injection direction of the fuel injection valve 5. Further, the connector mounting flange portion 4 of the injector housing 2 is also formed with a notched linear portion 4a in a substantially C-shape, as shown in FIGS.

Then, the connector 1 for connecting the harness 16
7, the width of the front end 17a side is wide as shown in FIG.
Moreover, it has a flat trapezoidal shape with a narrow width on the rear end 17b side. Further, the first and second engaging grooves 21, 22 are configured to be inclined in a substantially V-shape along the overall shape of the connector 17, and the locking portion 19 is also in the substantially C-shape. Leaning. Note that these C-shapes correspond to the shapes of the straight portions 14a and 15a of the first and second electrode plates 14 and 15 and the straight portion 4a of the connector mounting flange portion 4, respectively.

Therefore, in the construction of the above embodiment, when the connector 17 is inserted into the first and second electrode plates 14 and 15 of the fuel injection valve 5, the connector 17 is always in a predetermined direction, that is, the two C-shapes are not aligned. It can be inserted only in the matching direction. Even when the connector 17 is press-fitted into the injector housing 2, the connector 17 can be fitted only when the opening shape of the locking portion 19 of the connector 17 and the direction of the straight portion 4a of the connector mounting flange portion 4 are matched. Therefore, it is always pressed in with a predetermined directionality. In addition, in the assembled state that is press-fitted,
Since the straight portion 4a of the connector mounting flange portion 4 comes into contact with the inclined inner side surface of the injection valve stopper 18, the connector 17 does not rotate with respect to the connector mounting flange portion 4.

Therefore, although the fuel injection valve 5 can be assembled by an extremely simple assembling work, the directional fuel injection valve 5 can be mounted in a predetermined direction without fail.
It is suitable for mounting a fuel injection valve such as a directional injection or an elliptical injection pattern.

[0023]

As is apparent from the above description, according to the fuel injection device for the internal combustion engine of the present invention, the fuel injection valve is easily attached to the injector housing of the fuel gallery by utilizing the connector for connecting the harness. It is possible,
The workability of the assembly work of the fuel injection device is improved. In particular, when the injection pattern of the fuel injection valve has no directivity, it is not necessary to consider the directivity at the time of assembling the fuel injection valve, and workability can be further improved.

Further, in the case of a fuel injection valve having directivity such as two-way injection, a straight portion is provided in a part of the electrode plate or the connector mounting flange portion so that the fuel cell can be aligned in a predetermined direction reliably and easily. It becomes possible.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a fuel injection device according to the present invention in an assembled state.

FIG. 2 is an explanatory view showing an assembly procedure of this embodiment.

FIG. 3 is a front view of a main part of a fuel gallery.

FIG. 4 is a plan view of an essential part of the fuel gallery.

FIG. 5 is a perspective view of a fuel injection valve.

FIG. 6 is a sectional view of the fuel injection valve.

FIG. 7 is a perspective view of a connector.

FIG. 8 is a sectional view of the connector of the same.

FIG. 9 is a perspective view of a fuel injection valve used in another embodiment of the present invention.

FIG. 10 is a plan view of the same fuel injection valve.

FIG. 11 is a front view of the main part of the fuel gallery in this embodiment.

FIG. 12 is a plan view of an essential part of the fuel gallery.

FIG. 13 is a perspective view of a connector used in this embodiment.

[Explanation of symbols]

 2 ... Injector housing 4 ... Connector mounting flange portion 14 ... First electrode plate 15 ... Second electrode plate 17 ... Connector 19 ... Locking portion 21 ... First engaging groove 22 ... Second engaging groove 23, 24 ... Terminal Piece

Claims (2)

[Claims] 1. An injector housing formed in a fuel gallery, an electromagnetic fuel injection valve fitted and arranged in the injector housing, a connector mounting flange portion formed at an opening edge of the injector housing, A plate-shaped electrode plate provided at the base of the fuel injection valve and an engagement groove into which the side edge of the electrode plate can be inserted are formed to face each other inwardly, and the connector mounting flange part is sandwiched. A fuel injection device for an internal combustion engine, comprising: a connector having a substantially U-shaped portion provided at an opening edge; and a terminal piece arranged in an engaging groove of the connector so as to be electrically connected to the electrode plate. 2. The electrode plate is formed in a disc shape, and a linear portion is cut out in a part of the electrode plate corresponding to the injection direction of the fuel injection valve, and the engaging member is fitted to the linear portion. In addition to setting the dimensions of the mating groove, a straight portion is formed by cutting out a part of the flange portion so that the connector mounting flange portion and the connector locking portion can be fitted only at a predetermined angle. The fuel injection device for an internal combustion engine according to claim 1.