JPH11351106A - Mounting structure of fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify mounting and assembling work of an fuel injection valve, to increase degree of freedom of layout, and to reduce processing man-hours and a production cost, by simplifying a structure of a holding means of the fuel injection valve in an mounting structure of the fuel injection valve of an internal combustion engine. SOLUTION: A mounting structure 1 of a fuel injection valve 2 is constituted so that the fuel injection valve 2 is accommodated in a cylindrical holder 4 and covered by a plate member 5 to be held and a blow opening of the fuel injection valve 2 (a blow opening portion 2a) is faced the inside of an intake passage. The plate member 5 has two holding portions for holding the fuel injection valve 2. A first holding member includes a rising flange portion 5c to hold and press on the top of the fuel injection valve 2. The second holding portion includes mortise opening ends 5e, 5e brought into contact with locking portions 9a, 9a on the both sides of a coupler 9 installed on a coupler base portion 8 of the fuel injection valve 2, so that the locking portion 9a, 9a are pressed to position and lock the fuel injection valve 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve mounting structure for an internal combustion engine, and more particularly, to a fuel injection valve mounting method which simplifies the mounting operation of the fuel injection valve and reduces the product cost. Regarding the structure.

[0002]

2. Description of the Related Art As a conventional structure for mounting a fuel injection valve of an internal combustion engine, a locking portion for locking a connector (coupler) is formed at the upper edge of a cylindrical holder for accommodating the fuel injection valve. The fuel injection valve is positioned and detented by the portion, and a concave portion is formed in the upper edge portion, and a holding member that presses and holds the fuel injection valve from above is attached to the concave portion so as not to rotate. (Japanese Unexamined Patent Publication No. 7-1670)
No. 20).

[0003]

According to this, since the holding member does not have the function of positioning and preventing the rotation of the fuel injection valve, it can be simplified and reduced in size, and the product cost is reduced. Can be reduced, while
A locking portion for locking the connector (coupler) and a concave portion for holding the holding member must be formed in the upper edge portion of the cylindrical holder, thereby increasing the processing cost and restricting the layout. And other problems have occurred.

The invention of the present application solves such problems, simplifies the structure of the holding means for the fuel injection valve, simplifies the mounting and assembly work of the fuel injection valve, reduces the product cost, and reduces the layout. It is an object of the present invention to provide a mounting structure of a fuel injection valve capable of improving the degree of freedom of fuel injection.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a fuel injection valve mounting structure which solves the above-mentioned problems, and the invention described in claim 1 of the present invention relates to a fuel injection valve having a cylindrical shape. The fuel injection valve mounting structure, wherein the plate member is housed in a holder, and is held by covering a plate member from above the cylindrical holder, and the blast port faces the intake passage. Is provided, and a first holding unit of the two holding units is
A cut-and-raised brim portion, the cut-and-raised brim portion presses and holds the top of the fuel injection valve from above, and a second holding portion of the two holding portions comprises a hollow opening edge, The cutout opening edge contacts the locking portions on both sides of the coupler mounted on the coupler base of the fuel injection valve, presses the locking portion, positions the fuel injection valve, and stops the fuel injection valve from rotating. It is a mounting structure of a fuel injection valve characterized by being performed.

According to the first aspect of the present invention, the plate member holding the fuel injection valve presses and holds the top of the fuel injection valve from above, thereby holding the fuel injection valve. And a hollow opening edge that abuts against the locking portions on both sides of the coupler mounted on the coupler base of the fuel injection valve and presses the locking portion to position the fuel injection valve and prevent rotation. ing.

Therefore, one component (plate member)
Accordingly, the three functions of preventing the fuel injector from slipping out, positioning, and stopping the rotation can be performed, and moreover, it is only necessary to cover this part from above the cylindrical holder to hold the fuel injector. The structure of the holding means for the fuel injection valve is simplified, and the mounting and assembling work thereof can be simplified, so that the assembling workability is improved.

Further, since this part can be formed at a time by press working, its manufacture is easy.
The number of processing steps is also reduced, and the overall product cost can be reduced.

Further, since the holding means (plate member) for the fuel injection valve covers the fuel injection valve from above the cylindrical holder for housing the fuel injection valve and holds the fuel injection valve, the space can be saved and the layout can be reduced. The above flexibility is improved, and interference with other components can be prevented.

Further, according to the invention described in claim 2, the fuel injection valve is housed in a cylindrical holder, a plate member is held from above the cylindrical holder, and the fuel injection valve is held in the intake passage. In the mounting structure for a fuel injection valve, the plate member includes two holding portions for holding the fuel injection valve, and a first of the two holding portions.
Of the fuel injection valve presses and holds the top of the fuel injection valve from above, and a second holding portion of the two holding portions is hollowed out. The hollow opening edge is configured to abut against the locking portions on both sides of the fuel injection valve, press the locking portion, position the fuel injection valve, and prevent the fuel injection valve from rotating. A fuel injection valve mounting structure characterized by the following.

According to the second aspect of the present invention, the plate member for holding the fuel injection valve presses and holds the top of the fuel injection valve from above, thereby holding the fuel injection valve. And a cutout opening edge which abuts against the locking portions on both sides of the fuel injection valve to press the locking portion to position the fuel injection valve and to prevent the fuel injection valve from rotating.

Therefore, it is not necessary to specially form locking portions on both sides of the coupler, and the size of the plate member can be reduced. In addition, the same effects as the effects of the invention described in claim 1 can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (Embodiment 1) of the invention described in claim 1 of the present application shown in FIGS. 1 to 3 will be described below. FIG. 1 is an exploded perspective view of a mounting structure of the fuel injection valve according to the first embodiment, FIG. 2 is a longitudinal sectional view of the mounting structure of the fuel injection valve, and FIG. 3 is a plan view of a portion covered by the plate member of FIG. FIG.

In these drawings, a mounting structure 1 of a fuel injection valve 2 in the first embodiment is a mounting structure of a multipoint side-feed type fuel injection valve for an in-line four-cylinder internal combustion engine. The fuel supply pipe 3 connects the four cylindrical holders 4 corresponding to the number of cylinders to the sides thereof, and connects the four cylindrical holders 4 at a predetermined interval. 4, the fuel injection valve 2 is fitted and housed therein. Fuel supply pipes 3 and 4
The individual cylindrical holders 4 are integrally formed.

The fuel injection valve 2 housed in the cylindrical holder 4 has its blast port 2a facing the intake passage of an intake manifold (not shown), and, as described later, a plate member 5 from above. , And are fixed by being pressed and held from above (preventing slipping out), positioned and prevented from rotating. The plate member 5 includes pedestals 6 a and 6 formed integrally with the cylindrical holder 4.
b is fastened and fixed by bolts 7a and 7b.

A coupler base 8 is provided above the fuel injection valve 2.
Is protruded obliquely upward, a coupler 9 is mounted on the coupler base 8, and a solenoid of the fuel injection valve 2 and a power supply are connected.

Although not shown in detail, fuel flowing through the fuel supply pipe 3 is injected into the intake manifold from the two injection ports of the fuel injection valve 2 when the fuel injection valve 2 is opened. Then, the air is mixed with air flowing in the intake manifold to form an air-fuel mixture, which is supplied from an intake port to a combustion chamber of an internal combustion engine.

In the structure shown in FIGS. 1 to 3, the intake manifold is formed separately from the fuel supply pipe 3 and the cylindrical holder 4 and is connected to them by bolts. As shown in FIG.
The intake manifold 10 may be formed integrally with the fuel supply pipe 3 and the cylindrical holder 4 by casting.

The plate member 5 is configured as follows. As shown in FIGS. 1 and 3, the plate member 5 has a gourd shape with an outline shape that is angled in a plan view, and both ends of a body part having a large and small two-stage width are projected round. , And the bolts 7a, 7b
Circular holes 5a and 5b are formed.

A part of the body of the plate member 5 is cut and raised along the length direction and bent at a right angle, and the substantially central portion of the cut and raised piece is bent at a right angle in the opposite direction. Thus, a brim portion 5c (first holding portion) is formed.

Further, the remaining part of the body portion that has been cut and raised is cut out along the contour of the plate member 5 to form an opening 5d having a large and small two-step width. The opening 5d has a pair of opening edge portions 5e, 5e (second
Holding portion), and a pair of small-width opening edge portions 5f, 5f
And a pair of tapered opening edge portions 5g connecting them.
g. The shape of the plate member 5 thus formed in plan view is symmetric with respect to the line connecting the circular holes 5a and 5b.

Next, the operation of the first embodiment will be described. The fuel injection valve 2 is housed in the cylindrical holder 4, and the plate member 5 is covered from above, and the plate member 5 is fastened to the pedestals 6a, 6b by bolts 7a, 7b.
When the coupler 9 is mounted on the coupler base 8 of the fuel injection valve 2, a pair of locking portions 9a, 9a (see FIGS. 2 and 3) on both sides of the coupler 9 are just between the pair of opening edge portions 5e, 5e. The engaging portions 9a, 9e
Since a is pressed, the fuel injection valve 2 is positioned and stopped.

At this time, the cut-and-raised flange portion 5c of the plate member 5 comes into contact with the top of the fuel injection valve 2 and presses it from above, so that the fuel injection valve 2 comes out of the cylindrical holder 4. It is kept so that there is not.

The pair of legs 8a, 8 of the coupler base 8
a is fixed to the peripheral wall of the fuel injection valve 2, and the outer surface thereof has the opening edge portions 5 f and 5 f of the opening 5 d of the plate member 5.
Although it abuts on the transition from f to the tapered opening edge portions 5g, 5g, it does not contribute positively to the positioning and detent of the fuel injection valve 2.

The top of the fuel injection valve 2 is pressed by the cut and raised flange 5c of the plate member 5 and the opening 5d is formed.
By pressing the pair of locking portions 9a, 9a of the coupler 9 by the pair of opening edge portions 5e, 5e, the fuel injection valve 2 is prevented from falling out of the cylindrical holder 4, and the positioning and the detent are prevented. Done and completely fixed.

Since the first embodiment is configured as described above, the following effects can be obtained. The plate member 5 for holding the fuel injection valve 2 has a cut-and-raised brim portion 5c and a pair of opening edge portions 5e, 5e (cut-out opening edges). And the cut and raised collar 5c
Presses the top of the fuel injection valve 2 from above, and holds the fuel injection valve 2 so as not to fall out of the cylindrical holder 4. Further, the pair of opening edge portions 5e, 5e abut on a pair of locking portions 9a, 9a of the coupler 9, and the locking portions 9a, 9a.
Are pressed to position the fuel injection valve 2 and stop the rotation.

Therefore, the three functions of preventing the fuel injection valve 2 from slipping out, positioning, and preventing rotation can be performed by holding three points using one part (plate member 5). Since it is only necessary to cover the fuel injection valve 2 from above the holder 4, the structure of the holding means of the fuel injection valve 2 is simplified, and the mounting and assembling work thereof can be simplified. The workability of assembly is improved.

Also, since this part can be formed at a time by press working, its manufacture is easy.
The number of processing steps is also reduced, and the overall product cost can be reduced.

The holding means (plate member 5) of the fuel injection valve 2 covers the fuel injection valve 2 from above the cylindrical holder 4 that houses the fuel injection valve 2, and holds the fuel injection valve 2. Therefore, space can be saved, the degree of freedom in layout can be improved, and interference with other components can be prevented.

Next, one embodiment (Embodiment 2) of the invention described in claim 2 of the present application shown in FIG. 5 will be described. The mounting structure 1 of the fuel injection valve 2 according to the second embodiment is different from the first embodiment only in the structure of the second holding unit.

That is, as shown in FIG.
A pair of opening edge portions 5f, 5f having a small width of the opening 5d is used as a hollow opening edge of the holding portion, and a pair of locking portions having flat surfaces are provided on both sides of the peripheral wall of the fuel injection valve 2. Overlay portions 2b, 2b are formed.

The build-up portion 2b may be formed integrally with the peripheral wall of the fuel injection valve 2, or may be formed as a separate part and fixed to the peripheral wall of the fuel injection valve 2 by a separate fixing means. Good. Further, although not shown in FIG. 5, it may be formed as a part of a pair of legs 8a, 8a of the coupler base 8.

Therefore, the fuel injection valve 2 is now housed in the cylindrical holder 4, and the plate member 5 is covered from above, and the plate member 5 is mounted on the pedestals 6a, 6b with bolts 7a,
When the coupler 9 is attached to the coupler base 8 of the fuel injection valve 2, the flat surfaces of the pair of built-up portions 2 b, 2 b of the fuel injection valve 2 are just between the pair of opening edge portions 5 f, 5 f. When the fuel injection valve 2 is fitted, the pair of opening edge portions 5f press the flat surfaces of the pair of built-up portions 2b, 2b, so that the fuel injection valve 2 is positioned and stopped. In other respects, there is no difference from the first embodiment.
Detailed description is omitted.

Since the second embodiment is configured as described above, it is not necessary to specially form locking portions on both sides of the coupler 9, and the plate member 5 can be downsized. In addition, the same effects as those of the first embodiment can be obtained.

In the first and second embodiments, the mounting structure 1 for the fuel injection valve 2 is of the multi-point side-feed type, but is instead of the single-point side-feed type. You may. In this case, one cylindrical holder 4 is formed integrally with the common intake pipe portion upstream of the intake manifold.

Further, the fuel injection valve 2 is described as having two nozzles, but is not limited to this, and may have one nozzle. However, when the fuel injection valve has two nozzles, it is more indispensable to prevent the fuel injection valve 2 from rotating.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fuel injector mounting structure according to an embodiment (Embodiment 1) of the invention described in claim 1 of the present application.

FIG. 2 is a longitudinal sectional view of a mounting structure of the fuel injection valve.

FIG. 3 is a plan view of a portion covered by the plate member of FIG. 2;

4 shows a modification of the embodiment of FIG. 1 and FIG.
It is a longitudinal cross-sectional view cut at a different position.

FIG. 5 is a partial plan view of a main part of a fuel injection valve mounting structure according to an embodiment (Embodiment 2) of the invention described in claim 2 of the present application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve mounting structure, 2 ... Fuel injection valve, 2a ... Injection port, 2b ... Overlay, 3 ... Fuel supply pipe, 4 ... Cylindrical holder, 5 ... Plate member, 5a, 5b ... Bolt hole ,
5c: Cut-and-raised brim portion, 5d: Opening, 5e, 5f: Opening edge portion, 5g: Tapered opening edge portion, 6a, 6b: Pedestal, 7a, 7b: Bolt, 8: Coupler base, 8a: Leg, 9 ... coupler, 9a ... locking part, 10 ... intake manifold.

Claims (2)

[Claims] 1. A fuel injection valve is housed in a cylindrical holder,
In a fuel injection valve mounting structure in which a plate member is placed over and held from above the cylindrical holder and the blast port faces the intake passage, the plate member holds two fuel injection valves. A first holding portion of the two holding portions is formed by a cut-and-raised brim portion. The cut-and-raised brim portion presses and holds the top of the fuel injection valve from above, The second holding portion of the two holding portions is formed with a hollow opening edge, and the hollow opening edge comes into contact with locking portions on both sides of a coupler mounted on a coupler base of the fuel injection valve and the locking is performed. A fuel injection valve mounting structure, wherein the mounting portion is pressed to position the fuel injection valve and prevent the fuel injection valve from rotating. 2. The fuel injection valve is housed in a cylindrical holder,
In a fuel injection valve mounting structure in which a plate member is placed over and held from above the cylindrical holder and the blast port faces the intake passage, the plate member holds two fuel injection valves. A first holding portion of the two holding portions is formed by a cut-and-raised brim portion. The cut-and-raised brim portion presses and holds the top of the fuel injection valve from above, The second holding portion of the two holding portions includes a hollow opening edge, and the hollow opening edge contacts the locking portions on both sides of the fuel injection valve to press the locking portion, and the fuel injection A fuel injection valve mounting structure wherein the valve is positioned and is prevented from rotating.