JP2665252B2 - Fuel supply device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a fuel supply device for an internal combustion engine for a vehicle, and more particularly to a fuel supply device comprising a fuel injection valve and a fuel supply pipe for supplying fuel thereto, and a fuel supply device for the fuel supply pipe. The present invention relates to a current-carrying assembly.

[Conventional technology]

Conventional fuel supply devices are disclosed in JP-A-59-229049 and
As described in -229050, the fuel supply pipe has a plurality of injection valve receiving portions each having two openings directed in the fuel injection direction and the opposite direction as an opening for mounting a fuel injection valve. The opening of the fuel injection direction supports the injection valve base part in a liquid-tight manner, the opening in the opposite direction supports the rear of the injection valve in a liquid-tight manner, and the rear part of the injection valve together with the current-carrying terminal is outside the fuel supply pipe. It was a configuration to be issued. For this reason, as a sealing means for preventing leakage of the fuel in the fuel supply pipe and the fuel injection valve, two points of the fuel supply pipe, the injection valve base and the opening supporting the rear part, and the fuel injection valve, two points. 3 places for one connection terminal and center adjuster shaft, total 5
A liquid-tight portion was provided at each location.

Further, as described in JP-A-59-34473, in order to secure the fuel injection valve in the axial direction, a special holding body for pressing the rear part of the injection valve outside the fuel supply pipe is provided. Was.

Further, a separate means for supplying electricity to the connection terminal of the fuel injection valve is provided for each injection valve, and the connection operation has to be performed for each injection valve.

[Problems to be solved by the invention]

In the above conventional fuel supply device, high-precision processing,
There are many liquid-tight parts that require high-quality O-rings, which is disadvantageous in terms of cost and reliability. Further, in order to fix the fuel injection valve inserted in the injection valve receiving portion in the axial direction, it is necessary to screw the rear holding member or the injection valve holding portion, etc. In the process, it is necessary to connect every one injection valve, and there is a problem that the number of man-hours for assembling and the number of parts required for assembling are increased.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a fuel supply device and a current supply assembly for the fuel supply pipe, in which the liquid-tight portions of the fuel supply pipe and the fuel injection valve are reduced.

A second object of the present invention is to provide a fuel supply device and a current supply assembly for a fuel supply pipe which can reduce the number of steps and the number of parts required for assembling.

[Means for solving the problem]

In order to achieve the first object, a fuel supply apparatus according to the present invention includes a plurality of fuel supply pipes each having only one opening directed in the fuel injection direction as an opening for mounting a fuel injection valve. The fuel injection valve including the base portion is inserted into each of the injection valve receiving portions from the opening, and the space between the base of the fuel injection valve and the opening is made liquid-tight.

In order to achieve the first and second objects, the fuel supply device according to the present invention further comprises a fuel injection pipe receiving wall provided inside the fuel supply pipe, the fuel injection pipe being provided with a wall for supporting the fuel injection valve. Is supported by this wall, and the fuel injection valve is fixed in the axial direction.

Further, in order to achieve the first and second objects, the fuel supply apparatus of the present invention further includes a plurality of fuel supply pipes extending inside the fuel supply pipe and connected to the energization terminals of the plurality of fuel injection valves. The power supply device includes a power supply unit including a power supply terminal and a plurality of conductive wires, and a connection connector provided at a location where the fuel supply pipe is taken out of the power supply unit in a liquid-tight manner, and collectively taking out the plurality of conductive wires of the power supply unit. .

Here, preferably, the energizing means is integrally formed by embedding an energizing terminal and a conductive wire in a resin member, and the resin member is provided with a portion for supporting a rear portion of the injection valve receiving portion. One end of the resin member is formed in the shape of a connection connector so that the energizing means and the connection connector are integrally formed.

Further, in order to achieve the first and second objects, the current-carrying assembly according to the present invention is provided with a plurality of current-carrying terminals extending inside a fuel supply pipe and respectively connected to current-carrying terminals of a plurality of fuel injection valves. And a connecting connector that is provided at a place where the lead is taken out of the fuel supply pipe in a liquid-tight manner, and has a plurality of leads of the conducting means that are collectively taken out. The connecting connector is constructed by embedding a conducting terminal and a conducting wire of a conducting means in a resin member, and forming one end of the resin member into a shape of the connecting connector and integrally molding the same.

[Action]

In the fuel supply device of the present invention configured as described above, by providing a plurality of injection valve receiving portions each having only one opening facing the fuel injection direction as an opening for mounting the fuel injection valve, The two openings become one, and the liquid-tight part correspondingly becomes one. Further, since the rear part of the injection valve is housed in the fuel supply pipe, there is no need to seal at least the adjuster shaft at the center of the injection valve. Therefore, the liquid-tight portion between the fuel supply pipe and the fuel injection valve is reduced.

A wall supporting the fuel injection valve is provided inside the fuel supply pipe at the injection valve receiving portion, and the fuel injection valve is inserted through the opening,
By supporting the rear portion of the fuel injection valve with the wall, the fuel injection valve is sandwiched between the outer wall of the intake pipe and the wall, and is fixed in the axial direction. For this reason, no special means for fixing the fuel injection valve in the axial direction is required, and the number of man-hours and parts required for assembly are reduced.

In the fuel supply device and the current-carrying assembly of the present invention, the conductor of the current supply means connected to the current-carrying terminals of the plurality of fuel injection valves extends inside the fuel supply pipe and is provided at the lead-out location of the fuel supply pipe. The connection connector collectively takes it out to the outside, so that the liquid-tight portion of the current-carrying terminal, which was two places per injection valve, becomes only one place of the connection connector part.
Therefore, the liquid-tight part of the fuel supply device is reduced.

Further, the energizing means is formed integrally with a resin member by embedding the energizing terminal and the conducting wire, and by arranging this in the fuel supply pipe, the fuel injection valve is inserted into the opening and at the same time both connection terminals are connected. , Connection time is reduced. By molding one end of the resin member into the shape of the connection connector and integrally forming the power supply means and the connection connector, the power supply means and the connection connector can be handled as one unit, and the number of steps and the number of parts required for assembling are reduced.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

1 to 4, the fuel supply device of the present embodiment includes four electromagnetic fuel injection valves 1 of side feed type (only one is shown in FIGS. 1 and 2) and this fuel injection device. Valve 1
A fuel supply pipe 2 for supplying fuel to the fuel injection valve 1, and an energizing assembly 3 for energizing the fuel injection valve 1.

As shown in FIG. 1, the fuel injection valve 1 has a yoke 4 and a core made of a magnetic material, a plunger rod 7 made of a plunger part 6 as a magnetic material, and a valve attached to the tip of the plunger rod 7 to control injection. A movable valve part composed of a body 8, an inner metal part 10 having a nozzle 9 having a seat part,
A spring 11 for urging the valve body 8 of the movable valve portion toward the seat portion of the nozzle 9, a bobbin 12 located around the core 5 and an electric signal wound around the bobbin 12 and input from the connection terminal 13 to generate a magnetic flux. An adjuster shaft 11A for adjusting the strength of the spring 11 is provided in the core 5 and includes a coil 14 to be generated and a stopper 15 for defining the position of the movable valve portion when the valve is opened.
Is fixed by swaging.

Fuel is supplied to the fuel injection valve 1 through a filter 17 through a fuel hole 16 provided on a side surface of the yoke 4.
Reflux from 16. The heat resistance is improved by adopting a structure in which the fuel passes through the fuel injection valve 1 as described above.

The fuel supply pipe 2 is provided with four injector receiving portions 20 corresponding to the four fuel injection valves, and the fuel injector 1 is housed in the injector receiving portion 20. Each injection valve receiving portion 20 includes a fuel chamber 23 provided on a pipe wall of the fuel supply pipe 2 and having an opening 21 and a flange 22 opened to a fuel injection method, and an energizing assembly 3 located in the fuel supply pipe 2. And a support wall 24 provided at a position where the opening 21 is aligned.

The fuel injection valve 1 is housed in the receiving portion 20 by being inserted through the opening 21 of the fuel chamber 22. At this time, the fuel injection valve 1
The base 10 is mounted in a liquid-tight manner by disposing an O-ring 25 between the base 10 and the inner wall of the opening 21. A positioning projection 26 is provided on the rear part of the fuel injection valve 1, that is, the core 1, and the support wall part 24 is provided.
Is provided with a positioning recess 27, the protrusion 26 is inserted into the recess 27, and the core 1 is supported on a support surface of the support wall portion 24 via an elastic member 28. Then, the front end portion of the fuel injection valve 1, that is, the lower surface of the base portion 10 is pressed against the outer wall of the intake pipe 29, and the flange 22 of the fuel chamber 23 is bolted (not shown) to the outer wall of the intake pipe. 1 is sandwiched between the support wall 24 and the outer wall of the intake pipe, and is fixed in the axial direction between the two.

At the same time as the fuel injector 1 is inserted, the injector valve terminal 13 is connected to an energizing terminal 40 provided on the energizing assembly 3 and described later.

The fuel supply pipe 2 has a fuel inlet 30 and a fuel fuel recirculation port 31, and a recirculation type fuel supply system including a fuel tank, a fuel pump, a pressure regulator, a filter, and the like (not shown) is connected to the fuel inlet 30. Is done. Part of the fuel supplied from the fuel inlet 21 is injected into the intake pipe 19 from the orifice of the nozzle 9 via the fuel injection valve 1, and the rest is discharged from the fuel recirculation port 31.

The energizing assembly 3 is arranged inside the fuel supply pipe 2 and has a plurality of energizing terminals 40 connected to the energizing terminals 13 of the four fuel injection valves 1 and a wiring portion 42 having a plurality of conducting wires 41.
And a connector 44 which is liquid-tightly attached via an O-ring 43 to one end of the fuel supply pipe 2 where the wire is taken out, and which collectively takes out a plurality of wires 41 of the wire portion 42 to the outside. 42 and the connector 44 are energized terminals 40
The conductor 41 is embedded in the resin member 45, and one end of the resin member 45 is integrally formed into a connector having a groove in which the O-ring 43 fits. The resin member 45 is provided with the four positioning recesses 27 for fixing the fuel injection valve described above.

In the present embodiment configured as described above, the support wall portion 24 of the opening 21 and the support wall portion 24 forming the injection valve receiving portion 20 is provided.
Are located in the fuel supply pipe 2,
Only one liquid-tight portion is required by the O-ring 25 of the opening 21. Further, since the rear part of the fuel injection valve 1 is housed in the fuel supply pipe 2, the conventional adjuster shaft
No seal is required for 11A. Furthermore, since the place where the lead wire 41 is taken out is integrated into one place by the connection connector 44, the liquid-tight part for energization has four O-rings for the four fuel injection valves.
43 is one place. For this reason, the number of liquid-tight portions, which has conventionally been five, has been greatly reduced to two.

Further, since the support wall portion 24 of the injection valve receiving portion 20 is provided inside the fuel supply pipe 2 and the fuel injection valve 1 is fixed in the axial direction between the support wall portion 24 and the outer wall of the intake pipe, the fuel No special means for fixing the injection valve in the axial direction is required, and the injection valve can be easily assembled with a simple configuration.

Furthermore, since the wiring portion 42 and the connector 34 are integrally formed with the resin member 45 to form the energized assembly 3 and the wiring portion 42 is disposed in the fuel supply pipe 2, the fuel injection valve 1 is inserted into the opening 21. At the same time, both connection terminals 13 and 14 are connected, and the number of connection steps is reduced, and the wiring portion 42 and the connection connector 34 can be handled as one unit, so that the number of steps and the number of parts required for assembling are reduced.

Another embodiment of the present invention will be described with reference to FIGS. In the above-described embodiment, the energizing assembly 3 is installed in the fuel supply pipe 2, and the conducting wires for energizing the injection valve are collectively taken out at one place of the connector 44. However, in the present embodiment, the energizing assembly 3 is not used. This is an example.

That is, in FIG. 5 and FIG.
The wall 24A supporting the rear part of the fuel injection valve 1A is formed directly on the pipe wall of the fuel supply pipe 2A, and the wall 24A is provided with a terminal hole 50 into which the energizing terminal 13 of the fuel injection valve 1A is inserted. An O-ring 51 is arranged between the energizing terminal 13 and the terminal hole 50.

In this embodiment, the number of openings 21 of the injection valve receiving portion 20A is one, and the rear portion of the fuel injection valve 1A is housed in the fuel supply pipe 2A. There is an effect that the fuel injection valve is fixed in the axial direction between the wall portion 24A and the outer wall of the intake pipe 29, so that the fuel injection valve can be easily fixed. .

Further, in this embodiment, by inserting the energizing terminal 13 of the fuel injection valve 1A into the terminal hole 50, it is possible to use a coupler 52 as shown in FIG. As in the case where the three-dimensional body 3 is used, the step of connecting the conducting terminal and the conductive wire can be simplified.

In FIG. 7, a lead wire 53 is connected to a current-carrying terminal of the fuel injection valve 1B, and the plurality of lead wires 53 pass through the inside of the fuel supply pipe 2B and are collectively taken out from one end thereof by a connection connector 44B. The connector 44B is provided with an O-ring 43 for sealing between the connector 44B and the fuel supply pipe 2B. Injection valve receiving part
The wall supporting the rear part of the injection valve of 20B is provided directly on the pipe wall of the fuel supply pipe 2B as in the embodiment of FIG.

In this embodiment, since the lead wires 53 for a plurality of fuel injection valves 1B are collectively taken out by the connector 24B, the number of liquid-tight parts is the same as that of the embodiment of FIG. There is. This embodiment is particularly effective when the fuel supply pipe is bent into a complicated shape.

In the above embodiment, the injection valve receiving portion is provided with a wall portion for supporting the rear portion of the fuel injection valve. However, this wall portion is not provided, and the rear portion of the injection valve is floated inside the fuel supply pipe, and the injection is performed. The valve base may be fixed to the opening 21 by welding or screwing. In this case, too, the opening for mounting the fuel injection valve is made one, and the rear part of the injection valve is housed in the fuel supply pipe. A reduction effect can be obtained.

Further, in the above embodiments, the side feed type fuel injection valve is shown as an example. However, the present invention is not limited to this, and the present invention is similarly applicable to a top feed type fuel injection valve.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, the liquid-tight part of a fuel supply pipe and a fuel injection valve is reduced, and there exists an effect of cost reduction, improvement of reliability, and improvement of incorporation.

Also, the number of assembly steps and the number of parts of the fuel injection valve are reduced,
Similarly, there are effects of cost reduction, improvement of reliability, and improvement of incorporation.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a fuel supply device according to one embodiment of the present invention, and FIG. 2 is an exploded view showing a fuel injection valve, a fuel supply pipe, and a power supply assembly constituting the fuel supply device. , FIG. 3 is a perspective view of the fuel supply as viewed from the opening direction, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 1, and FIG. FIG. 6 is a sectional view of a main part of a fuel supply device according to an embodiment, FIG. 6 is a perspective view of the entire fuel supply device as viewed from the direction opposite to the opening, and FIG. 7 is a fuel supply device according to still another embodiment of the present invention. It is the perspective view which looked at the supply apparatus from the opening part direction. DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve 2 ... Fuel supply pipe 3 ... Electrical assembly 20 ... Injection valve receiving part 21 ... Opening part 24 ... Support wall part 25 ... O-ring 40 ... Connection terminal 41 … Lead wire 42… Wiring part 43… O-ring 44… Connector 45… Resin member

Claims (7)

(57) [Claims] 1. A fuel supply device comprising: a plurality of electromagnetic fuel injection valves; and a fuel supply pipe for supplying fuel to the fuel injection valve. An opening provided in the fuel supply pipe for mounting the fuel injection valve. A plurality of injection valve receiving portions each having only one opening directed in the fuel injection direction as a portion, and inserting a fuel injection valve including a base portion from the opening into each injection valve receiving portion; A fuel supply device, wherein a space between a base of a valve and the opening is liquid-tight. 2. A fuel supply system comprising: a plurality of electromagnetic fuel injection valves; and a fuel supply pipe for supplying fuel to the fuel injection valve. An opening provided in the fuel supply pipe for mounting the fuel injection valve. A plurality of injection valve receiving portions each having only one opening directed in the fuel injection direction as a portion and a wall portion for supporting a fuel injection valve inside the fuel supply pipe; A fuel injection valve including a base is inserted from the opening to make the space between the base of the fuel injection valve and the opening liquid-tight, and a rear portion of the fuel injection valve is supported by the wall to allow fuel injection. A fuel supply device, wherein a valve is fixed in an axial direction. 3. A fuel supply device comprising: a plurality of electromagnetic fuel injection valves; and a fuel supply pipe for supplying fuel to the fuel injection valve. An opening provided in the fuel supply pipe for mounting the fuel injection valve. Each of the fuel injection valves has only one opening facing the fuel injection direction, and the fuel injection valve including the base is inserted from the opening, and a liquid-tight space is provided between the base of the fuel injection valve and the opening. A plurality of injection valve receiving portions, and an energizing means extending and disposed inside the fuel supply pipe and including a plurality of energizing terminals and a plurality of conductive wires respectively connected to energizing terminals of the plurality of fuel injection valves, A connection connector provided at a location where the lead wire is taken out from the fuel supply pipe so as to be liquid-tight, and a plurality of lead wires of the energizing means that are collectively taken out to the outside. 4. The fuel supply device according to claim 3, wherein said current supply means is formed by embedding a current supply terminal and a conductive wire in a resin member and integrally forming the same. 5. The fuel supply device according to claim 4, wherein a portion for supporting a rear portion of the injection valve receiving portion is provided on a resin member of the power supply device. 6. The fuel supply device according to claim 4, wherein one end of the resin member is formed in the shape of the connection connector, and the energizing means and the connection connector are integrally formed. apparatus. 7. A plurality of electromagnetic fuel injection valves are mounted,
In a current supply assembly for a fuel supply pipe for supplying fuel to the fuel injection valve, a plurality of current supply terminals and a plurality of current supply terminals are provided extending inside the fuel supply pipe and connected to the current supply terminals of the plurality of fuel injection valves, respectively. An electrical connection device having a conducting wire; and a connection connector provided at a location where the conducting wire is taken out from the fuel supply pipe so as to be liquid-tight and taking out a plurality of conducting wires of the conducting means to the outside collectively. And a connecting connector, wherein a current-carrying terminal and a conducting wire of a current-carrying means are embedded in a resin member, and one end of the resin member is formed in a shape of the connection connector and integrally formed.