JPH10205409A - Fuel injection device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Object] To provide a two-hole fuel injector positioning structure that can be formed integrally with a fuel rail beam when mounting the two-hole fuel injector on a sheet metal fuel rail beam. With the goal. A plurality of injector cups mounted to protrude outward from a fuel rail beam, a two-hole fuel injector for injecting fuel into an intake pipe, and a rail member forming a hollow cross section are integrally formed. And an extension portion extending in parallel with one side of the injector cup and the extension portion for prohibiting the fuel injector from rotating relative to the injector cup and positioning in a rotational direction. And an engaging portion provided on the injector engaged with the portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection system for an internal combustion engine, and more particularly, to a low-cost structure for preventing the two members from rotating relative to each other when the fuel injector is inserted into an injector cup. It is made possible.

[0002]

2. Description of the Related Art When supplying fuel to an engine, a fuel injector for each cylinder attached to an intake pipe is:
One end is held by the fuel rail beam, and the other end is located in a cylindrical fuel suction hole provided in the intake pipe. The structure related to the fuel rail beam described above is disclosed in Japanese Utility Model Publication No. 4-2413.
As shown in FIG. The fuel rail beam, which is a combination of sheet metal parts, has side portions that are joined and overlapped with each other, so that there are few machined parts and rail assembly work is easy, and the side wall has a double thickness structure. Can be increased in the direction parallel to Further, since the strength of the fuel rail member in the longitudinal direction is large, the fuel injector can be firmly held during the replacement work and the operation.

[0003]

Generally, it is not preferable that fuel adheres to the intake passage wall due to a demand for improving the performance of the engine. Therefore, the fuel injector attached to the intake pipe needs to be attached so that fuel does not adhere to the intake passage. In supplying fuel to an intake passage having two intake ports by a fuel injector, the fuel injector needs to be attached to an intake pipe at an appropriate position in order to spray fuel to each intake port.

However, in the prior art disclosed in Japanese Utility Model Publication No. 4-24138, when such a fuel injector is assembled to an injector cup provided on a fuel rail beam, a positioning member for positioning the fuel injector is provided. Since the fuel injector is not provided, the fuel injector cannot be mounted at an appropriate position where the fuel can be injected so that the fuel does not adhere to the intake pipe.

On the other hand, a structure capable of assembling a fuel injector to a fuel rail beam at an appropriate position is shown in Japanese Utility Model Publication No. 2-16064. At least one flat portion is provided in the outer periphery of the fuel injector in the vicinity of the insertion portion to the fuel rail beam, and two arms for sandwiching the outer peripheral portion where the flat portion of the fuel injector is provided on the fuel rail beam from both sides. Provided,
The arm is pressed against the outer surface to easily and surely position the fuel injector.

However, for the purpose of providing a positioning structure integrally with a sheet metal fuel rail beam as shown in Japanese Utility Model Publication No. 4-24138, a structure for positioning a fuel injector shown in Japanese Utility Model Publication No. 2-16064. Cannot be used as is. When a closed section is formed by combining U-shaped sections, as in the prior art described above, if the fuel injector is held by two arms, a positioning arm is provided integrally with the fuel rail beam. In such a case, it is necessary to extend the arm to a position avoiding the injector cup. When a closed section is formed by combining U-shaped sections in the direction of the arrow shown in FIG. 7, the distal ends of the two arms have a width enough to grip the fuel injector.
When assembling the character-shaped section member, the tips of the two arms hinder the assembling operation. As described above, there is a problem that a work space for assembling is limited, which causes a problem that working efficiency of assembly is hindered.

The present invention has been made in view of the above points, is relatively lightweight, is economical and easy to manufacture, and can efficiently manufacture a fuel injector while positioning it. It is an object of the present invention to provide a fuel injection device for an internal combustion engine that can be used.

[0008]

In order to achieve the above object, a first configuration of a fuel injection device for an internal combustion engine devised according to the present invention is provided in an intake passage, and a predetermined configuration in the intake passage is provided. In a fuel injection device for an internal combustion engine having a fuel injector for injecting fuel in a direction, a plurality of press-formed sheet metal rail members are combined to form a hollow fuel rail beam forming a fuel flow path; An injector cup mounted to protrude outward from the fuel rail beam and holding an end of the fuel injector; and a single rail member forming the fuel rail beam, integrally formed with the injector cup. An extension extending only from one side along the direction in which the injector cup protrudes; and the fuel injector being held by the injector cup and the fuel injector rotating relative to the injector cup. In which and a positioning portion provided in order fuel injector the extending portion is engaged so as to prohibit the.

According to a second configuration, in a fuel injection device for an internal combustion engine having a fuel injector disposed in an intake passage and injecting fuel in a predetermined direction in the intake passage, a U-shaped cross section is formed by press molding. The two side walls of one of the two rail members made of sheet metal are overlapped with the both side walls of the other member, respectively, and joined so as to form a liquid-tight side seam at the overlapping portion. A hollow fuel rail beam made of two rail members, an injector cup mounted so as to protrude outward from the fuel rail beam and holding an end of the fuel injector, and the rail member An extending portion extending from only one side wall of one of the rail members in a direction in which the injector cup projects, and a fuel injection device in a state where the fuel injector is held by the injector cup. There are those comprising a positioning portion to said extended portion is provided in the fuel injector to be engaged to prohibit the relative rotation with respect to the injector cup.

In a third configuration, the extension portion has a guide portion formed so as to extend in a connecting direction of the connector for distributing power to the fuel injector to the fuel injector. In a fourth configuration, the positioning section is provided on a connector that distributes power to the fuel injector.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel injector mounting structure according to the present invention will be described below with reference to the drawings. The two-hole fuel injector 1 is supported by an intake pipe 8 and a fuel rail beam 9 as shown in FIG. The above-described two-hole fuel injector 1
A fuel rail beam 9 serving as a fuel pipe for supplying fuel to the intake pipe 8 is fixed to the intake pipe 8 with bolts (not shown).

The fuel rail beam 9 is bolted to the intake pipe 8.
14 and the two-hole fuel injector 1
Is provided with an injector cup 12. Figures 1 and 2
The fuel injector 1 shown in FIG. 1 has an injection hole 3 at one end with a connector terminal 2 (shown by imaginary lines in FIG. 1) provided for receiving power supply for operating the member. And a fuel introduction hole 4 at the other end. The two injection holes 3 are provided at one end of the two-hole fuel injector 1 symmetrically at positions eccentric to the axis of the two-hole fuel injector 1. On the other end side, a mounting groove 6 for an O-ring 5 for fuel sealing is formed in the circumferential direction near the end face to seal the fuel from leaking between the injector cup 12 and the injector cup 12.

The two-hole fuel injector 1 has a ring-shaped grommet 10 at one end to prevent air leakage from between the mounting recess 11 formed in the intake pipe 8 and the two-hole fuel injector 1. It is supported by the intake pipe 8 through the. Mounting recess 11
, A ring-shaped grommet 10 is attached with airtightness.

On the other hand, the other end of the two-hole fuel injector 1 is supported by an injector cup 12. The injector cup 12 has an inner diameter substantially equal to the outer diameter of the other end of the two-hole fuel injector 1 for inserting the other end of the two-hole fuel injector 1 and the other end. A predetermined length is formed to a depth that can be inserted. The other end of the two-hole fuel injector 1 is inserted and supported in the injector cup 12. O-ring 5 described above
Accordingly, the fuel is prevented from leaking from between the injector cup 12 and the two-hole fuel injector 1.

The two-hole fuel injector 1 is elastically supported for each of the intake pipe 8 and the fuel rail beam 9 so as to block the vibration generated during fuel injection. In addition to the one end of the two-hole fuel injector 1 being supported by the above-described grommet 10 and the other end of the two-hole fuel injector 1, between the member and the injector cup 12. A ring-shaped grommet 13 is interposed in the fuel injection valve 1 to prevent the vibration generated during fuel injection into the two-hole fuel injector 1 from being transmitted to the fuel rail beam 9.

As shown in FIG. 1, the fuel rail beam 9 is a rail member 1 having a substantially U-shaped cross section.
6 and the rail member 17 form a closed cross section through which fuel flows. The rail member 16 and the rail member 17 formed into a U-shaped cross section by press molding are overlapped so that both side walls of the rail member 16 cover the both side walls of the rail member 17 from the outside. They are joined to form a liquid-tight side seam 24. or,
By combining the U-shaped cross-section members as shown in the drawing, the end of the side wall of the rail member 16 abuts against the bottom wall of the rail member 17, so that a predetermined cross section can be obtained without using a jig.

As shown in FIGS. 1 and 3, the injector cup 1 is formed integrally with the rail member 16 so as to protrude from the rail member.
An extension 15 extending along the injector cup 12 is formed on only one side wall of the rail member 16 up to a position close to the tip of the second member 2. In a state where the two-hole fuel injector 1 is supported by the fuel rail beam 9 and the intake pipe 8, the extending portion 15 is configured to prohibit the relative rotation of the two-hole fuel injector 1 with respect to the injector cup 12. Positioning part 1 to be engaged
8 is provided in the two-hole fuel injector 1.

As shown in FIG.
a, the guide portion 15b. Guide part 15b
Are provided so as to substantially coincide with the inclination direction of the connector terminal 2. Since the distance between the tip of the guide portion 15b and the tip of the side wall on the opposite side is formed sufficiently larger than the cross-sectional distance of the rail member 17, when the member is combined with the rail member 16, The extension 15 does not become an obstacle. Since the assembling can be performed with the concave portions facing each other, the assembling can be performed efficiently without causing unnecessary movement in assembling.

The connector terminal 2 has a substantially rectangular shape as shown in FIG.
Are formed. A locking claw 7 for locking the mating connector terminal is formed on the other surface connecting the two opposing surfaces. A recess 21 is provided in the connector terminal 19 into which the connector terminal 2 is inserted and locked. The connector terminal 19 is for supplying a fuel injection pulse supplied from the electronic control fuel injection device to the connector terminal 2 provided in the two-hole fuel injector 1. When the connector terminal 19 is connected to the connector terminal 2, the groove 22 in which the ridge 6 provided on the connector terminal 2 is locked so as to prevent the two connector terminals from rotating relative to each other. Provided on each of the surfaces. The projecting ridge 6 is guided by the groove 22 to connect the connector terminal 2 and the connector terminal 19, and the locking claw 7 provided on the connector terminal 2 to fix this state.
Are locking locking portions 23 provided on the connector terminal 19.
Engages.

The positioning section 18 is provided on the connector terminal 19. In the positioning portion 18, when the connector terminal 2 is connected to the connector terminal 19, the projection 20 formed as a projection having an L-shaped cross section is shown in FIG. Guide part 1 in between
5b. Incidentally, the positioning structure in the present invention is not limited to this, and as shown in FIG.
9 is provided with a projection 25, and an extended portion 27 having a holding portion 26 having a gap for holding the projection 25 is attached to the fuel rail beam 9.
May be provided.

The operation of the fuel injection device for an internal combustion engine configured as described above will be described below. The fuel rail beam 9 is fixed to the intake pipe by bolts in a predetermined positional relationship. Therefore, the two-hole fuel injector 1 in which the fuel introduction hole 4 is inserted into the injector cup 12 is provided at the tip of the fuel rail beam 9 if it is positioned in the rotational direction with respect to the fuel rail beam 9. The position of the injection hole 3 is also determined at a predetermined position in the rotation direction with respect to the intake pipe 8. This positioning and rotation stop are performed as follows.

The two-hole fuel injector 1 is prevented from rotating by inserting the guide portion 15b of the extending portion 15 into a gap as a positioning portion 18 provided on the connector terminal 19 connected thereto. . The two-hole fuel injector 1 is held by the positioning portion 18 and the extending portion 15 without play in the rotation direction,
The position is accurately determined in the rotation direction. The position of the injection hole 3 is also accurately directed to each of a plurality of predetermined intake valve head portions (not shown). Further, with such a configuration, the guide portion 15b of the extension portion 15 may be long enough to extend to the side of the injector cup 12, and the component can be efficiently blanked from the rolled steel plate, and the material to be cut off is used. Can reduce material consumption. The distance between the tip of the guide part 15b and the tip of the side wall part on the opposite side is the rail member 1
7 is sufficiently larger than the cross-sectional distance of 7, so that the extension 15 does not become an obstacle when the member is combined with the rail member 16.

When this positioning structure is used, the fuel rail beam 9 is held with the two-hole fuel injector 1 supported by the injector cup 12, and then fixed to the intake pipe 8. At this time, since the two-hole fuel injector 1 is supported at both ends by the grommets 10, 13 and the O-ring 5, fine adjustment can be performed by hand. Connector terminal 1
Prior to assembling the connector 9, the connector terminal 19 is manually rotated to a position where connection work is expected to be possible. Thereafter, the connector terminal 19 is connected to the connector terminal 2 while being guided by the guide portion 15b.

According to this positioning structure, since the two-hole fuel injector 1 is elastically supported by the fuel rail beam 9 and the intake pipe 8 and is fixed via the connector terminal 19, the two-hole fuel injector 1 is provided. 1 is cut off, and the generation of vibration noise is prevented.

Further, in the second embodiment of the present invention, only the points different from the first embodiment will be described. In the second embodiment, as shown in FIG. 5, the rail members 28, 2 having a substantially U-shaped cross section are used.
9 are superimposed on each other, and the extended portion 31 is attached to the rail member 29 on the side where the injector cup 30 is assembled.
The feature is that it is provided. With this configuration, not only the operation and effect of the first embodiment can be obtained, but also the effect that the injector cup 30 can be attached to the rail member 29 without being obstructed by the extension portion 31. Is also obtained.

[0026]

According to the first aspect of the present invention, the extended portion serving as the positioning member of the fuel injector can be provided integrally even with a fuel rail beam made of sheet metal. Then, when joining the rail member on the side to which the injector cup is attached to the rail member so as to form a fuel flow path therewith,
Since the extension does not hinder the joining operation, the fuel rail beam can be efficiently assembled.

According to the second aspect of the present invention, both side walls of one of the two rail members formed into a U-shaped cross section by press forming are overlapped with the both side walls of the other member, respectively. The rigidity of the fuel rail beam can be secured.

According to the third aspect of the present invention, since the extension portion has the guide portion substantially aligned with the inclination direction of the connector terminal provided on the fuel injector, the mating connector terminal provided on the fuel injector can be provided. It can be used as a guide for the work of connecting the connector terminals, and the efficiency of assembling the connector can be improved.

According to the fourth aspect of the present invention, since the engagement portion is provided on the connector terminal, it is not necessary to lengthen the extension portion unnecessarily. Further, the positioning structure can be applied without changing the outer shape of the fuel injector.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a two-hole fuel injector is attached to an intake pipe using the present invention.

FIG. 2 is a front view of a two-hole fuel injector viewed from an injection hole side.

FIG. 3 is a front view and a plan view of a fuel rail beam.

FIG. 4 is a front view and a plan view of a connector terminal.

FIG. 5 is a diagram illustrating a conventional technique.

FIG. 6 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Two injection hole fuel injector 2 ... Connector terminal 8 ... Intake pipe 9 ... Fuel rail beam 12 ... Injector cup 15 ... Extension part 15a ... Linear part 15b ... Guide part 16 ... Rail member 17 ... Rail member 18 ... Positioning part 19 ... Connector terminal 24 ... Side joint

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[Procedure amendment]

[Submission date] April 9, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a two-hole fuel injector is attached to an intake pipe using the present invention.

FIG. 2 is a front view of a two-hole fuel injector viewed from an injection hole side.

FIG. 3 is a front view of a fuel rail beam.

FIG. 4 is a front view and a plan view of a connector terminal.

FIG. 5 is a diagram for explaining a second embodiment.

FIG. 6 is a diagram illustrating a modification of the first embodiment.

FIG. 7 is a diagram illustrating a conventional technique.

[Description of Signs] 1... 2 injection hole fuel injector 2... Connector joint 8... Intake pipe 9... Fuel rail beam 12. 15 ··· Extension part 15a ··· Linear part 15b ··· Guide part 16 ··· Rail member 17 ··· Rail member 18 ··· Positioning part 19 ··· Connector terminal 24 · ... Side joints

Claims (4)

[Claims] 1. A fuel injection device for an internal combustion engine having a fuel injector disposed in an intake passage and injecting fuel in a predetermined direction in the intake passage, wherein a plurality of press-formed sheet metal rail members are combined. A hollow fuel rail beam forming a fuel flow path, an injector cup mounted so as to protrude outward from the fuel rail beam and holding an end of the fuel injector, and the fuel rail beam. An extension portion formed integrally with one rail member to be formed and extending only from one side of the injector cup along a projecting direction of the injector cup; and the fuel injector is held by the injector cup. A positioning portion provided on the fuel injector so that the extension portion is engaged so as to prohibit the fuel injector from rotating relative to the injector cup in the retracted state. A fuel injection device for an internal combustion engine. 2. A fuel injection device for an internal combustion engine having a fuel injector disposed in an intake passage and injecting fuel in a predetermined direction in the intake passage, wherein the U-shaped cross section is formed by press molding. The two side walls of one of the two rail members are superimposed on the both side walls of the other member, respectively, and are joined so as to form a liquid-tight side seam at the overlapped portion. A hollow fuel rail beam made of a rail member, an injector cup mounted to protrude outward from the fuel rail beam and holding an end of the fuel injector, and one of the rail members An extending portion extending from only one side wall of the two rail members in a direction in which the injector cup projects, and wherein the fuel injector is held by the injector cup and the fuel injector is an injector. Mosquito And a positioning portion provided on the fuel injector so that the extension portion is engaged so as to prohibit relative rotation with respect to the tip. 3. The extension according to claim 1, wherein the extension portion has a guide portion formed to extend in a connecting direction of the connector for distributing power to the fuel injector to the fuel injector. A fuel injection device for an internal combustion engine. 4. The fuel cell system according to claim 1, wherein the positioning portion is provided on a connector that distributes power to the fuel injector.
4. The fuel injection device for an internal combustion engine according to 3.