JP3237361B2 - Fuel injection device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an electronically controlled fuel injection device for an internal combustion engine.

[0002]

2. Description of the Related Art An electronically controlled fuel injection device used in an internal combustion engine such as a gasoline engine is a single point injector that injects fuel in a single direction from a fuel injection valve disposed facing an intake port. 63-1
Japanese Unexamined Patent Publication No. 3-61160 discloses a multipoint injector that injects fuel from one fuel injection valve to a plurality of intake ports. As shown in FIG. 4, the multipoint injector accommodates a fuel injection valve 92 having a connector portion 93 protruding to the outside of a cylindrical injector housing 91 formed in a fuel supply pipe 10. The injection valve 92 has a top 9 formed in a prismatic shape.
2A is protruded toward the outside of the injector housing 91, and a top portion 92 is provided on an end surface of the injector housing 91.
A cover 94 crossing the end face of A is screwed through bolts 95, 95 provided at both ends.

The cover 94 is in contact with the end surface of the top portion 92A to restrict the fuel injection valve 92 from dropping from the injector housing 91. On the other hand, a concave portion 94A formed on the inner periphery of the cover 94 engages the side surface of the top portion 92A. In addition, the rotation of the fuel injection valve 92 is restricted. In this way, fuel is injected from the fuel injection valve 92 positioned by the cover 94 in a plurality of predetermined directions and flows into a predetermined intake port (not shown).

[0004]

However, in the above-described conventional fuel injection device, the fuel injection valve 92 is attached to the injector housing 91 and the positioning is performed through the two bolts 95, 95, so that the number of parts increases. Work efficiency was sometimes reduced.

The present invention has been made in view of the above problems, and has as its object to provide a fuel injection device for an internal combustion engine that can be easily mounted with a reduced number of parts.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a fuel injection valve having a connector portion protruding from a top portion is housed in the inner periphery of a substantially cylindrical injector housing formed in a fuel supply pipe, while the fuel injection valve is provided. In a fuel injection device for an internal combustion engine having a holding cover traversing the top of a valve and being screwed to an end face of the injector housing, a through hole is formed at a base end side of the holding cover, and the injector is formed from the other end. A projecting portion is provided protruding toward the outer periphery of the housing, and a portion on the top of the fuel injection valve through a bent portion from the middle of the holding cover.
The fuel injection valve has a groove formed on an end surface of the injector housing and capable of engaging with the projection, and an engagement portion of the holding cover is formed on a side surface of a top portion of the fuel injection valve. A fuel injection device for an internal combustion engine, comprising: a fastening means that forms a flat surface to be engaged and is inserted into the through hole and screwed to an end face of an injector housing.

[0007]

Therefore, in order to assemble the fuel injection valve into the injector housing, the fuel injection valve is housed on the inner periphery of the injector housing, and then a holding cover is provided so as to cross the top of the fuel injection valve. The holding cover is attached to the injector housing by fastening means inserted through the through hole on the end side. At this time, the engaging portion of the holding cover is engaged with a flat surface formed on the side surface of the top of the fuel injection valve, and the protruding portion projecting from the end of the holding cover is engaged with the groove formed on the end surface of the injector housing. Thus, the displacement of the fuel injection valve in the falling direction is restricted by the holding cover traversing the top, and the bent portion of the holding cover regulates the displacement of the fuel injection valve in the turning direction, so that the fuel injection valve is always at a predetermined position. Can be maintained.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1 to FIG.
Has a substantially cylindrical injector housing 1 formed therein.
An opening 1A provided at the bottom protrudes into the inner periphery of an intake port (not shown).

A cylindrical fuel injection valve 3 is housed on the inner periphery of the injector housing 1. The fuel injection valve 3 has an injection port 3 </ b> A at the bottom, and a prismatic top 30 at the opening 1 </ b> B side of the injector housing 1. The side surface 30A of the top 30 is formed as a predetermined plane,
Forms the end face of the fuel injection valve 3.

The fuel injection valve 3 is housed so that the injection port 3A is fitted into the opening 1A of the injector housing 1. From the top 30 of the fuel injection valve 3, a connector 31 for connecting to a control device (not shown) is provided. It projects toward the upper side of the injector housing 1 at a predetermined angle (the upper side in FIG. 2, the same applies hereinafter). The injection port 3A injects fuel in a plurality of directions (not shown).

The end surface of the injector housing 1 from which the connector portion 31 protrudes is provided with a stepped portion 13 having a screw hole 14 formed above the end surface 30B of the fuel injection valve 3, while the injector housing 1 is opposed to the stepped portion 13. On the end face, the projections 11, 11 are provided below the end face 30B of the fuel injection valve 3.
A predetermined groove portion 12 sandwiched between is formed.

The stepped portion 13 of the injector housing 1 has a holding cover 2 made of a plate-like member and a bolt 5 as a fastening means inserted through a through hole 22 provided on the base end side.
Is fixed by screwing it into the screw hole 14.
Is disposed in a direction crossing over the fuel injection valve 3.

As shown in FIG. 3, the holding cover 2 has a through-hole 22 formed on the base end side, and a bent portion 2 bent at a substantially right angle downward on the way from the base end to the other end.
1 from the bent portion 21 to the top 30 of the fuel injection valve 3.
Is formed along the side surface 30 </ b> A, and a central portion of the holding cover 2 is formed from a middle portion of the engaging portion 23 as a convex portion which is bent in a horizontal direction toward the outer periphery of the injector housing 1. Are protruded.

The holding cover 2 fixed to the step 13 is fixed at its base end to the injector housing 1 by bolts 5 to restrict displacement in the vertical direction.
By engaging the groove 4 with the groove 12, displacement in the rotation direction about the bolt 5 is restricted.

The end face 30B of the fuel injection valve 3 and the holding cover 2
An insulator 4 formed of an elastic member is interposed between the fuel injection valve 3 and the displacement of the fuel injection valve 3 in the vertical direction.
3, the displacement of the fuel injection valve 3 in the rotation direction is restricted.

The operation will be described next.

The fuel injection valve 3 is connected to the injector housing 1
In the step of assembling, first, the fuel injection valve 3 is housed in the inner periphery of the injector housing 1 from the injection port 3A side, and the injection port 3A is fitted to the opening 1A at the bottom.

Next, the insulator 4 is placed on the end face 30B of the fuel injection valve 3 and the claws 24 of the holding cover 2 are placed.
Is engaged with the groove 12 and the engaging portion 23 is
The holding cover 2 is disposed so as to cross over the top 30 after engaging with the side surface 30 </ b> A.

When the bolt 5 inserted into the through hole 22 of the holding cover 2 is fastened to a screw hole 14 formed in the step portion 13 of the injector housing 1, the holding cover 2 connects the fuel injection valve 3 to the injector 3 via the insulator 4. The fuel injection valve 3 is pressed toward the bottom of the inner circumference of the housing 1, and is fixed to the inner circumference of the injector housing 1.

The holding cover 2 engages the claw 24 formed on the end with the groove 12 formed on the end face of the injector housing 1, and the holding cover 2 is restricted from rotating in the rotating direction. The rotation of the fuel injection valve 3 that engages the engagement portion 30A with the engagement portion 23 is also restricted, and the injection port 3A is always held in a predetermined injection direction.

Thus, the claw 24 formed at one end of the holding cover 2 traversing above the fuel injection valve 3 is engaged with the groove 12 provided at the end face of the injector housing 1 and the bent engaging portion 23 is formed at the top. The fuel injection valve 3 can be easily and reliably positioned by engaging the base end of the holding cover 2 with the step 13 of the injector housing 1 with one bolt 5 by engaging with the side surface 30A of the fuel injection valve 3. Thus, the number of bolts to be used can be reduced as compared with conventional bolts, and the efficiency of assembly work can be improved while reducing the number of parts.

In the above embodiment, the holding cover 2
Presses the fuel injection valve 3 through the insulator 4, but not shown, the step 13 is connected to the end face 3 of the fuel injection valve 3.
The fuel injection valve 3 can be pressed and held by the holding cover 2 if it is formed substantially horizontally with 0B.

[0024]

As described above, according to the present invention, the convex portion formed at one end of the holding cover crossing the top of the fuel injection valve is engaged with the groove provided on the end surface of the injector housing and formed on the holding cover. The engagement portion is engaged with the flat surface formed on the top side surface of the fuel injection valve, so that the fuel injection valve can be easily and reliably attached to the injector housing, thereby reducing the number of parts and increasing the efficiency of assembly work. It is possible to improve and reduce the weight.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a holding plate.

FIG. 4 is a plan view of a fuel injection device showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injector housing 2 Holding cover 3 Fuel injection valve 5 Bolt 10 Fuel supply pipe 12 Groove part 22 Through hole 23 Engagement part 24 Claw 30 Top part 30A Side surface 31 Connector part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 55/02 340 F02M 55/02 330 F02M 51/08 F16B 5/10

Claims (1)

(57) [Claims] 1. A fuel injection valve having a connector portion projecting from a top thereof is housed in an inner periphery of a substantially cylindrical injector housing formed in a fuel supply pipe, while traversing the top of the fuel injection valve. In a fuel injection device for an internal combustion engine having a holding cover screwed to an end face of the injector housing, a through-hole is formed at a base end side of the holding cover, and a convex portion from the other end toward an outer periphery of the injector housing. Protruding from the middle of the holding cover and injecting fuel
And forming an engaging portion along the side surface of the top of the valve, with the convex portion formed on the end face engageable with the groove of the injector housing, the holding of the cover on the side of the top portion of the fuel injection valve Engagement
A fuel injection device for an internal combustion engine, comprising: a fastening means that forms a flat surface that engages with the portion and that is inserted through the through hole and screwed into an end face of the injector housing.