JPH07224738A - Fuel injection device - Google Patents

Abstract

PURPOSE:To facilitate assembly work of a fuel injection device in which an injector is arranged in a delivery pipe, and decrease its cost. CONSTITUTION:A fuel injection device is provided with an injector 8, a delivery pipe 7 having therein an electric supply harness 20 having delivery pipe side terminals 21a, 21b connected to the injector side terminals 33a, 33b provided on the injector mounting part and the injector 8, and connector members 34a, 34b for connecting the injector side terminals 33a, 33b to the delivery pipe side terminals 21a, 21b. Therefor, thickness H2 of the injector side terminals 33a, 33b is made different from the thickness H1 of the delivery pipe side terminals 21a, 21b, and the connector members 34a, 34b surely remain on either one side of the injector side terminals 33a, 33b and the delivery pipe side terminals 21a, 21b when the injector 8 is detached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device, and more particularly to a fuel injection device having an injector arranged in a delivery pipe.

[0002]

2. Description of the Related Art Generally, an internal combustion engine having a structure for performing fuel injection control using a microcomputer is provided with a fuel injection device for injecting fuel pumped from a fuel pump toward an intake port of each cylinder. . This fuel injection device is roughly composed of a delivery pipe and a fuel injection valve (hereinafter referred to as an injector).

The delivery pipe is connected to a fuel pump arranged in the fuel tank, and the fuel is pumped from the fuel pump. The injector is attached to the delivery pipe, and opens the valve based on the fuel injection signal supplied from the microcomputer to inject the fuel pressure-fed into the delivery pipe toward the intake port.

Therefore, a wire harness for supplying a fuel injection signal from the microcomputer is connected to the injector. As a method of arranging the wire harness, a method of arranging the wire harness on the outer peripheral portion of the delivery pipe main body and then fixing the wire harness on the delivery pipe main body by fixing is generally performed. Further, a male connector is disposed at a connection portion of the wire harness with each injector, and the male connector is connected to a female connector formed on the injector to electrically connect the wire harness and the injector. It was configured.

However, in the structure in which the wire harness is arranged on the outer peripheral portion of the delivery pipe body, in addition to the work of connecting the injector to the delivery pipe body and the work of connecting the male connector to the female connector, the wire harness is delivered. The taping work on the outer circumference of the pipe body and the waterproofing work to prevent water from entering due to the wire harness being exposed to the outside of the delivery pipe body make the assembly work cumbersome and require many parts. Will be required and the product cost will increase.

In order to solve this problem, Japanese Patent Laid-Open No. 1-1
The technique disclosed in Japanese Patent No. 55071 is proposed.
In the fuel injection device disclosed in the publication, the delivery pipe is made of resin and the wire harness for supplying the fuel injection signal is insert-molded in the delivery pipe made of resin, so that the taping work and the waterproofing work are unnecessary. It has been configured with.

Further, a connector member is provided to connect the terminal (delivery pipe side terminal) formed in the wire harness and the injector side terminal provided in the injector, and the connector member is provided in the delivery pipe. It is supposed to be buried. The connector member has a tubular shape, and the delivery pipe side terminal is inserted from one end opening portion thereof, and the injector side terminal is inserted from the other end opening portion thereof. The delivery pipe-side terminal and the injector-side terminal are electrically connected by sandwiching the male-structured terminals with the female-structured connector members, respectively.

[0008]

As described above, by providing the connector member in the delivery pipe and connecting the delivery pipe side terminal and the injector side terminal through the connector member, the injector is delivered to the delivery pipe. Since the delivery pipe side terminal and the injector side terminal are electrically connected to each other at the same time when the fuel injection device is mounted on the vehicle, the assembling work of the fuel injection device can be easily performed.

However, in the above conventional fuel injection device, both the delivery pipe side terminal and the injector side terminal have the same shape, and the connector member also holds each terminal in the vicinity of both openings with the same holding force. It had been. Further, the connector member is configured to be detachably embedded in the delivery pipe.

Therefore, when the injector is removed from the delivery pipe for maintenance or repair, it is uncertain whether the bidirectional female connector member remains on the injector side or the delivery pipe side. That is, in an independent injection type engine having a plurality of cylinders, an injector is provided for each cylinder. In some injectors, the connector member remains on the injector side, and in other injectors, the connector member is the delivery pipe. It will remain on the side. In addition, the delivery pipe side terminal and the injector side terminal are configured as a pair of two, and the connector member remains on the injector side of one of the terminals of the pair and the connector member delivery pipe side of the other terminal. Will remain.

Further, since the injectors are generally compatible with each other, the injectors are frequently installed in different cylinders from those used during reassembly. This time,
If the connector members are attached separately on the injector side and the delivery pipe side as described above, when trying to mount the injector on the delivery pipe, when the connector members remain on each terminal to be connected, I cannot connect to the terminal.

Further, when one of the terminals configured as a pair of two as described above is properly connected, but no connector member remains on each of the other terminals,
It becomes impossible to make electrical connection between the terminals.

Therefore, in order to properly mount the injector on the delivery pipe in the state where the connector member is separately attached on the injector side and the delivery pipe side as described above, an operator attaches the connector member to each terminal. It is necessary to confirm whether or not they remain, and to assemble them, resulting in a problem that the efficiency of the assembly work is significantly deteriorated.

As a method for solving the above problems, one of the injector-side terminal or delivery pipe-side terminal to be connected is a male terminal and the other is a female terminal, and each terminal is connected without using a connector member. It is conceivable that the connection is made.

However, the injector side terminal is insert-molded in the resin housing of the injector, and the delivery pipe side terminal is insert-molded in the resin delivery pipe body. Therefore,
If the terminal is a female terminal with a complicated structure, it is necessary to make the mold structure an undercut shape in insert molding, the mold structure becomes complicated, the mold cost rises and the insert molding work becomes troublesome. There is.

The present invention has been made in view of the above points, and by making the thickness of the injector-side terminal different from the thickness of the delivery pipe-side terminal, the connector member is attached to the injector-side when removing the injector from the delivery pipe. Alternatively, it is an object of the present invention to provide a fuel injection device that is configured to be definitely left on either one of the delivery pipes to facilitate the assembly work and reduce the cost.

[0017]

In order to solve the above problems, in the present invention, an injector for injecting fuel and an injector mounting portion for mounting the injector at a predetermined mounting position in the delivery pipe body are formed. Along with this, a delivery pipe in which a power supply harness having a delivery pipe-side terminal connected to the injector-side terminal provided in this injector is installed, and the injector-side terminal and the delivery pipe-side terminal are both attached and elastically attached. In a fuel injection device provided with a connector member that electrically connects the injector-side terminal and the delivery pipe-side terminal by sandwiching, a connection direction in which the connector member is connected to the delivery pipe-side terminal and the power supply harness. Against the above The thickness of the Kuta side terminal, is characterized in that it has different from the thickness of the delivery pipe side terminal.

[0018]

In the fuel injection device configured as described above, the thickness of the injector side terminal is different from the thickness of the delivery pipe side terminal.

Therefore, when the connector member elastically clamps the injector-side terminal and the delivery pipe-side terminal, the clamping force at that time is greater in the thick terminal than in the thin terminal.

That is, when the thickness of each terminal is made different, the holding force for holding each terminal by the connector member becomes different.

Therefore, when the injector is removed from the delivery pipe, the connector member can be definitely left in the terminal having the larger clamping force (the terminal having the larger thickness).

[0022]

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

First, the fuel injection system in which the fuel injection device 1 according to one embodiment of the present invention is arranged will be described with reference to FIG. In the figure, reference numeral 2 denotes a fuel tank, and the fuel stored in the fuel tank 2 is pressurized by a fuel pump 3 and supplied to a fuel injection device 1 through a fuel filter 4, a fuel supply pipe 5, and a pulsation damper 6. To be done. In the above components, the fuel filter 4 removes dust contained in the fuel, and the pulsation damper 6 has a function of attenuating fuel pressure (fuel pressure) pulsation generated inside the fuel supply pipe 5. is there.

The fuel injection device 1 is, as will be described in detail later,
The delivery pipe 7 and a plurality of (four in this embodiment) injectors 8 are included. The fuel supply pipe 5 is connected to a delivery pipe 7, and the fuel fed under pressure is a fuel flow path 9 formed in the delivery pipe 7 (see FIG. 3).
Will be introduced to. An injector 8 is provided in the delivery pipe 7, and the injector 8 operates (opens and closes) in response to a fuel injection signal from a microcomputer to inject fuel into the intake manifold 10. The intake manifold 10 is connected to a surge tank 11 that suppresses the pulsation of intake air, so that the injected fuel is mixed with the air flowing from the surge tank 11 and then sucked into a combustion chamber (not shown).

A pressure regulator 14 is connected to the delivery pipe 7. The pressure regulator 14 is configured so that the pressure in the intake manifold is introduced from the pressure introduction pipe 13 connected to the surge tank 11, and the pressure regulator 14 is arranged in the fuel passage 9 disposed upstream of the fuel passage 9. Fuel pressure of intake manifold 10
The pressure is adjusted so as to be constant with respect to the internal pressure, and a function of supplying surplus fuel (fuel that has not been injected by the injector 8. hereinafter referred to as uninjected fuel) to the recirculation pipe 12 and recirculating it to the fuel tank 2 is achieved. Note that, for convenience of description, the pressure regulator 14 and the delivery pipe 7 are shown as separate bodies in FIG. 6, but in the fuel injection device 1 according to the present embodiment shown in FIG. 3, the pressure regulator 14 is provided as the delivery pipe 7. It is an integrated structure with.

Next, the above fuel injection system is provided.
A fuel injection device 1 which is an embodiment of the present invention will be described in detail below. FIG. 3 is a partially cutaway side view showing the overall configuration of the fuel injection device 1. As shown in the figure, the fuel injection device 1 is roughly composed of a delivery pipe 7 and a plurality of injectors 8.

The delivery pipe 7 has a delivery pipe body 15 made of resin and an injector mounting portion 16 formed integrally with the delivery pipe body 15. A fuel recirculation passage 17 is formed inside the delivery pipe body 15 together with the fuel passage 9 described above. The fuel supply pipe 5 described with reference to FIG. 6 is connected to the left end of the fuel passage 9 in the figure, and the fuel recirculation path 17 has a left end in the figure for returning the uninjected fuel to the fuel tank 2. The pipe 12 is connected.

A fuel regulator (pressure regulator) is provided at the right end of the delivery pipe body 15 in the figure.
14 are installed internally. This fuel regulator 14
It has a diaphragm 19 having a valve body 18 that connects and disconnects the fuel passage 9 and the fuel return passage 17. The pressure in the intake manifold is introduced from the pressure introducing pipe 13 to a surface of the diaphragm 19 different from the surface on which the valve body 18 is arranged, and the diaphragm 19 is displaced by this introduced pressure to drive the valve body 18, The fuel passage 9 and the fuel recirculation passage 17 are configured to communicate with each other and to be cut off.

By configuring the fuel regulator 14 as described above, the fuel pressure in the fuel passage 9 can be adjusted to be constant with respect to the pressure in the intake manifold 10, and the uninjected fuel is recirculated to the fuel recirculation passage 17 as well. And is returned to the fuel tank 2 through the return pipe 12.

On the other hand, the injector mounting portion 16 is formed at a predetermined position where the injector 8 is mounted, corresponding to the number of the injectors 8 arranged, and is integrally formed with the delivery pipe body 15 made of resin as described above. Has been done. The injector mounting portion 16 functions as a socket that connects the injector 8 and the fuel passage 9 and also functions as an electrical connector that supplies a fuel injection signal to the injector 8.

In this embodiment, a power supply harness (wire harness) 20 for supplying a fuel injection signal to the injector 8.
Is formed by insert molding in the delivery pipe body 15 made of resin. As described above, the delivery pipe main body 15 is made of resin, and the power supply harness 20 is insert-molded in the resin-made delivery pipe main body 15, so that the power supply harness is arranged outside the delivery pipe main body. This eliminates the need for taping the power supply harness to the outer periphery of the delivery pipe body, waterproofing work for preventing water, etc. from entering the wire harness, and simplifies the assembly work and reduces the number of parts. Therefore, the cost of the fuel injection device 1 can be reduced.

The power supply harness 20 is embedded in the delivery pipe main body 15 along the longitudinal direction at a lower position of the fuel passage 9, and the number of the power supply harnesses 20 is arranged corresponding to the number of the injectors 8 to be mounted. I'm waiting. The end of the power supply harness 20 on the injector mounting side is
Delivery injector side terminals 21a and 21b are formed in each injector mounting portion 16. Each of the delivery pipe side terminals 21a and 21b has a connector member mounting groove formed in the injector mounting portion 16 (details are shown in FIGS. 1 and 2, hereinafter referred to simply as mounting groove).
It projects into 22 and constitutes a male connector.

The other ends of the power supply harnesses 20 are collectively led out to a centralized connector 23 formed on the upper portion of the delivery pipe body 15. Therefore, the microcomputer for controlling the engine and each power supply harness 2
The centralized connector 23 can be used to make a connection with all the power supply terminals 0, and the connection work between the microcomputer and each power supply harness 20 can be easily performed. Further, since the centralized connector 23 is formed integrally with the delivery pipe main body 15, it is not necessary to separately provide a connector for connection with the microcomputer, and the number of parts can be reduced.

Here, the injector 8 and the injector mounting portion 16 are shown in an enlarged manner in FIGS. 1 and 2, and the constructions of the injector 8 and the injector mounting portion 16 will be described in further detail. It should be noted that a plurality of (in this embodiment, four) injectors 8 and injector mounting portions 1 are provided.
Since all 6 have the same configuration, only one of them is shown enlarged in the figure.

The injector 8 is roughly the nozzle section 2
4, a mounting portion 25, and a molding portion 26. The nozzle portion 24 and the mounting portion 25 have an integrated structure. A solenoid coil, a plunger, a needle valve and the like (not shown) are provided inside the nozzle portion 24, and the plunger is displaced by supplying a fuel injection signal from the microcomputer to the solenoid coil. The needle valve is configured to open and close. Further, the connection wirings 32 a and 32 b connected to the solenoid coil are drawn out to the upper part of the nozzle portion 24.

Further, the mounting portion 25 has a pipe shape, and the mounting hole 2 formed in the injector mounting portion 16 is formed.
By being inserted into 7, the fuel introduction opening 28 formed at the upper end communicates with the fuel passage 9. As described above, since the fuel regulated to the predetermined fuel pressure by the fuel regulator 14 is supplied into the fuel passage 9, the needle valve is opened when the fuel injection signal is supplied and the plunger is displaced, and thus the fuel is discharged. The fuel in the passage 9 passes through the mounting portion 25 by fuel pressure and is injected toward the intake manifold 10 from the injection port 29 formed at the tip of the nozzle portion 24. Further, a fitting groove 31 into which a fixed hook 30 described later is fitted is formed at a predetermined position of the mounting portion 25.

The mold part 26 is made of resin and is the mounting part 25.
Is formed so as to cover the. This mold part 26 is
Connection wiring 32 disposed above the nozzle portion 24 described above.
It is configured to hold a and 32b. Further, the tip end portions of the connection wirings 32a and 32b are exposed from the mold portion 26 at both side positions of the mounting portion 25 and are extended outward toward the upper side. The portion exposed from the mold portion 26 and extending upward functions as a male connector. Hereinafter, the molded portion 2 of the connection wiring 32a, 32b
The portions exposed from 6 and extending upward are referred to as injector-side terminals 33a and 33b.

In the above structure, the delivery pipe side terminal 21 disposed in the injector mounting portion 16
The reason why both a and 21b and the injector-side terminals 33a and 33b arranged in the injector 8 have a male connector structure is as follows. That is, the delivery pipe side terminals 21a and 21b are insert-molded in the delivery pipe main body 15, and the injector side terminals 33a and 33b are insert-molded in the mold portion 26. Therefore, each terminal 21a,
This is because if 21b, 33a, and 33b are female terminals having a complicated structure, the mold structure used at the time of insert molding becomes complicated, the mold cost increases, and the insert molding work becomes troublesome.

As described above, since the delivery pipe side terminals 21a and 21b and the injector side terminals 33a and 33b are both male connector structures for the sake of convenience in molding the die, the delivery pipe side terminals 21a and 2b.
1b and the injector side terminals 33a and 33b cannot be directly connected. For this reason, the connector members 34a and 34b are used as a structure which connects each terminal 21a, 21b, 33a, 33b.

The connector members 34a, 34b are made of a conductive metal having a spring property, and the delivery pipe side terminals 21a, 21b are inserted from the upper part, and the injector side terminals 33a, 33b are inserted from the lower part. Each terminal 21a, 21b, 33
a and 33b are electrically connected. That is, the connector members 34a and 34b form a female connector having an upper and lower bidirectional connection structure.

The connector members 34a, 34b are connected to the delivery pipe side terminals 21a,
21b is a connecting piece for sandwiching 21b from both sides via elastic force.
A and 35b are formed, and connection pieces 36a and 36b for sandwiching the inserted injector-side terminals 33a and 33b from both sides via elastic force are formed in the lower part thereof. These connection pieces 35a, 35b, 36a, 36
b has the same structure, and therefore the connector member 34
The a and 34b are vertically symmetrical shapes.

The connector members 34a, 3 having the above structure
4b is inserted and mounted in a mounting groove 22 formed in the injector mounting portion 16. In this way, the connector member 3
4a and 34b are inserted into and mounted in the mounting groove 22 without insert-molding the injector mounting portion 16 because the connector members 34a and 34b are female connectors and their structure is complicated. This is because the structure of molding complicates the mold structure used when molding the delivery pipe body 15. Since the connector members 34a and 34b are simply inserted and mounted in the mounting groove 22, depending on the force applied to the connector members 34a and 34b.
May leave.

Subsequently, the fuel injection device 1 having the above structure
In the injector 8, the injector mounting portion 1
The mounting method for mounting on 6 will be described.

To mount the injector 8 on the injector mounting portion 16, the mounting portion 25 of the injector 8 is aligned with the mounting hole 27 formed on the injector mounting portion 16, and the injector side terminal 33 is mounted.
a, 33b and terminals 21a, 21 on the delivery pipe side
After aligning b and b, the injector 8 is fitted into the injector mounting portion 16. At this time, connector members 34a and 34b are previously mounted in the mounting groove 22 formed in the injector mounting portion 16 and connected to the delivery pipe side terminals 21a and 21b.

By fitting the injector 8 into the injector mounting portion 16 as described above, the fuel introduction opening 28 formed in the mounting portion 25 is connected to the fuel passage 9.
The injector-side terminals 33a, 33b are electrically connected to the delivery pipe-side terminals 21a, 21b by connecting to the connecting pieces 36a, 36b of the connector members 34a, 34b.

When the injector 8 is mounted on the injector mounting portion 16, the fixing hook 30 is subsequently mounted on the injector mounting portion 16. As shown in FIG. 4 (a cross section taken along the line AA in FIG. 1) in addition to FIGS. 1 and 2, a hook mounting groove 37 is formed in an annular shape at a predetermined position of the injector mounting portion 16. In addition, a pair of window portions 38 facing each other are formed at predetermined positions of the hook mounting groove 37, and the hook mounting groove 37 and the mounting hole 27 are configured to communicate with each other. The pair of window portions 38 are configured to face the fitting groove 31 formed in the mounting portion 25 when the injector 8 is mounted in the injector mounting portion 16.

On the other hand, as shown in FIG. 4, the fixed hook 30 has a substantially U-shape corresponding to the shape of the hook mounting groove 37, and is formed by bending a wire-shaped spring material. A fitting convex portion 39 is formed at a position near the tip of the fixed hook 30.

By mounting the fixed hook 30 having the above structure in the hook mounting groove 37, the fixed hook 30
The fitting convex portion 39 formed in the
It goes inside and fits into the fitting groove 31 of the injector 8 facing the window 38. FIG. 4 shows a state in which the fitting protrusion 39 of the fixed hook 30 is fitted in the fitting groove 31.
In this way, by fitting the fitting convex portion 39 into the fitting groove 31, the injector 8 is attached to the injector mounting portion 16.
It is possible to prevent the injector 8 from being displaced (for example, rotating, coming off, etc.) in the injector mounting portion 16 in the mounted state, and to improve the reliability of the fuel injection device 1.

Subsequently, the injector-side terminal 33
a, 33b and terminals 21a, 21 on the delivery pipe side
The following description will be given focusing on the connection position with b.

As shown in the drawings, in this embodiment, the connecting positions of the injector side terminals 33a, 33b and the delivery pipe side terminals 21a, 21b are set in the longitudinal direction of the delivery pipe body 15 (indicated by an arrow X in FIG. 1). They are arranged so as to be parallel to each other (in the direction shown).

On the other hand, each terminal 21a, 21
A configuration is also conceivable in which b, 33a, 33b are arranged in parallel with each other in a direction orthogonal to the longitudinal direction X of the delivery pipe body 15. FIG. 5A shows each terminal 21a, 2
1B, 33a and 33b are arranged in parallel in a direction orthogonal to the longitudinal direction X of the delivery pipe body 15, and FIG. 5B shows each terminal 2 as in this embodiment.
1a, 21b, 33a, 33b are delivery pipe main body 1
5 shows a configuration in which the five are arranged in parallel in the longitudinal direction X.

As shown in FIG. 5 (A), each terminal 2
1a, 21b, 33a, 33b are delivery pipe main body 1
5, the width dimension of the fuel injection device (indicated by arrow W1 in the figure) increases, and the longitudinal cross-sectional area of the fuel injection device increases accordingly. . On the other hand, in the configuration in which the terminals 21a, 21b, 33a, 33b are arranged in parallel in the longitudinal direction X of the delivery pipe body 15 as in the present embodiment, X is
Terminals 21a, 21b, in a direction orthogonal to the direction,
Since 33a and 33b are not provided, the width dimension (indicated by arrow W2 in the figure) of the fuel injection device can be reduced as shown in FIG. 5 (B).

Since the fuel injection device 1 is arranged along the engine main body, the smaller the width dimension of the delivery pipe main body 15 in the direction orthogonal to the longitudinal direction X, the lower the degree of freedom of attachment to the engine main body. Can be improved, and the engine can be downsized. Therefore, by arranging the terminals 21a, 21b, 33a, and 33b in parallel in the longitudinal direction X of the delivery pipe body 15 as in the present embodiment, the degree of freedom of attachment to the engine body can be improved. As a result, the engine can be downsized.

Next, an electrical connection structure using the connector members 34a and 34b of the injector side terminals 33a and 33b and the delivery pipe side terminals 21a and 21b, which is a main part of the present invention, will be described.

As described above, in order to simplify the mold structure during insert molding, the injector-side terminals 33a and 33b and the delivery pipe-side terminal 21 are provided.
Both a and 21b have a female connector structure. Therefore, connector members 34a and 34b are used to electrically connect the terminals 21a, 21b, 33a and 33b.

Here, the injector-side terminal 33
a, 33b and terminals 21a, 21 on the delivery pipe side
The thickness dimension of b, in particular, the thickness dimension in the direction in which the connection pieces 35a, 35b, 36a, 36b forming the connector members 34a, 34b sandwich the terminals 21a, 21b, 33a, 33b, In the fuel injection device 1 according to the embodiment, the injector-side terminal 3
The delivery pipe side terminals 21a and 21b (indicated by H1 in the figure) are configured to be thicker than the thicknesses (indicated by H2 in the figure) of 3a and 33b.

In this way, the injector-side terminal 3
By making the thickness dimensions of 3a and 33b different from the thickness dimensions of the delivery pipe side terminals 21a and 21b, the force by which the connector members 34a and 34b clamp the injector side terminals 33a and 33b and the delivery pipe side terminal 21a. , 21b can be made different from each other.

That is, the connection pieces 35a, 35b, 36a, 36b constituting the connector members 34a, 34b elastically clamp the terminals 21a, 21b, 33a, 33b. Therefore, the value of this elastic clamping force is F, and each connecting piece 3
The spring constant of 5a, 35b, 36a, 36b is k, and the opposing connecting pieces 35a, 35b, 36a, 36
When the separation dimension between b is H, the elastic clamping force F can be calculated by the following equation.

F = k × H Here, the distance H between the connection pieces 35a, 35b, 36a, 36b is defined by the respective terminals 21a, 21b, 33a,
Since the thickness dimension of 33b can be regarded as H1 and H2, the clamping force when the delivery pipe side terminals 21a and 21b are clamped by the connection pieces 35a and 35b is F1 (hereinafter,
The delivery pipe-side clamping force F1) can be obtained by the following formula.

F1 = k × H1 ... Further, the clamping force when the injector-side terminals 33a, 33b are clamped by the connecting pieces 36a, 36b is F2 (hereinafter,
The injector-side clamping force F2) can be obtained by the following equation.

F2 = k × H2 As described above, in the present embodiment, the thickness of the injector-side terminals 33a and 33b and the thickness of the delivery pipe-side terminals 21a and 21b are made different from each other. With respect to the thickness dimension H2 of the side terminals 33a, 33b, the delivery pipe side terminal 21a,
It is configured such that the thickness dimension H1 of 21b is larger (H1> H2). Therefore, according to the formula and the formula, the magnitude relationship between the delivery pipe side clamping force F1 and the injector side clamping force F2 is as follows.

Therefore, when the injector 8 is removed from the injector mounting portion 16 at the time of maintenance, the connector members 34a and 34b are connected to the connecting pieces 35a and 35b, respectively.
The one having a stronger clamping force between 36a and 36b will definitely remain. In the case of this embodiment, since the delivery pipe side holding force F1 is larger than the injector side holding force F2 as described above, the injector 8 is attached to the injector mounting portion 1
As shown in FIG. 2, the connector members 34a and 34b are removed from the delivery pipe side terminal 21a,
21b definitely remains.

In this way, the connector members 34a, 34b
Remains definitely on the delivery pipe side terminals 21a and 21b, so that when the injector 8 is reassembled, even if the injector 8 is arranged in a cylinder different from the one at the time of removal, the connector members 34a and 34b still have the delivery pipe side terminals. Terminals 21a, 21b, 33a, 33b, since they are definitely left on 21a, 21b
Can be reliably connected, and it is possible to prevent misassembly, failure, and loss of parts.

In addition, a worker who has been conventionally required attaches the connector member 3 to each terminal 21a, 21b, 33a, 33b.
It is not necessary to confirm whether or not 4a and 34b remain and to assemble them, so that the efficiency of assembly work can be improved.

In the above embodiment, the thickness dimension H1 of the delivery pipe side terminals 21a and 21b is larger than the thickness dimension H2 of the injector side terminals 33a and 33b. However, conversely, with respect to the thickness dimension H1 of the delivery pipe side terminals 21a, 21b, the injector side terminals 33a,
The thickness dimension H2 of 33b may be larger. In this configuration, the injector-side clamping force F2 is larger than the delivery pipe-side clamping force F1, and therefore when the injector 8 is removed from the injector mounting portion 16, the connector members 34a and 34b are fixed to the injector-side terminals 33a and 33b. Will be retained.

[0066]

As described above, according to the present invention, by making the thickness of the injector-side terminal different from the thickness of the delivery pipe-side terminal, a difference occurs in the clamping force with which the connector member clamps each terminal. Therefore, when the injector is removed from the delivery pipe, it is possible to definitely leave the connector member in the terminal having the larger clamping force (the terminal having the larger thickness).

Since the connector member definitively remains on one of the terminals in this manner, it is possible to prevent the occurrence of misassembly, failure, and loss of parts, and at the same time, an operator conventionally required to connect the connector member to each terminal. It is no longer necessary to confirm whether or not there are remaining parts to be assembled, and the efficiency of the assembly work can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a main part of a fuel injection device according to an embodiment of the present invention.

FIG. 2 is a view showing a state where the injector is detached from an injector mounting portion in the fuel injection device shown in FIG.

FIG. 3 is a diagram showing an overall configuration of a fuel injection device which is an embodiment of the present invention.

FIG. 4 is a sectional view taken along the line AA in FIG.

5 (A) is a diagram showing a configuration in which each terminal is arranged in parallel in a direction orthogonal to the longitudinal direction of the delivery pipe body, and FIG. 5 (B) shows each terminal in the delivery pipe body. It is a figure which shows the structure arrange | positioned in parallel in the longitudinal direction X.

FIG. 6 is a configuration diagram showing a fuel injection system provided with a fuel injection device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Fuel Injection Device 2 Fuel Tank 3 Fuel Pump 7 Delivery Pipe 8 Injector 9 Fuel Passage 10 Intake Manifold 12 Reflux Piping 14 Fuel Regulator 15 Delivery Pipe Main Body 16 Injector Attachment 17 Fuel Return Passage 20 Power Supply Harness 21a, 21b Delivery Pipe Terminal 22 mounting groove 23 centralized connector 24 nozzle section 25 mounting section 26 molding section 27 mounting hole 28 fuel introduction opening 30 fixed hook 31 fitting groove 33a, 33b injector side terminal 34a, 34b connector member 35a, 35b, 36a, 36b connection piece 37 hook Mounting groove 38 Window 39 Fitting protrusion

Claims (1)

[Claims] 1. An injector for injecting fuel, and an injector mounting portion for mounting the injector at a predetermined mounting position in a delivery pipe body, and
A delivery pipe in which a power supply harness having a delivery pipe-side terminal connected to an injector-side terminal disposed in the injector is installed, and the injector-side terminal and the delivery pipe-side terminal are both attached and elastically attached. In a fuel injection device provided with a connector member for electrically connecting the injector side terminal and the delivery pipe side terminal by sandwiching, the connector member is connected to the delivery pipe side terminal and the power supply harness. The thickness of the injector side terminal is different from the thickness of the delivery pipe side terminal with respect to the connecting direction.