JPH10103191A - Fuel injection device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally form a plurality of terminal parts and a part connecting these terminal parts by a conductive member, received easily and properly in a fuel distribution pipe. SOLUTION: A device comprises a plurality of fuel injection pipes 4a to 4d mounted in each cylinder of an internal combustion engine to have an excitation coil and a fuel distribution pipe having a fuel passage supplying fuel relating to each of these fuel injection valves also having a connection part electrically connecting each excitation coil of the fuel injection valve to in external terminal. A conductive member (conductive plate 10) having a first terminal part 11 connected to the external terminal and a second terminal part 12 connected to the excitation coil, over almost a total length in the lengthwise direction, is held by a first/second holding fixture 60, so as to expose a tip end of the first/second terminal part 11, 12, the conductive member and the first/ second holding fixture 60 are integrally received to a housing 1 of the fuel distribution pipe.

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 for an internal combustion engine, and more particularly to a fuel injection device having a fuel passage for supplying fuel to each of a plurality of fuel injection valves mounted on each cylinder of the internal combustion engine. The present invention relates to a fuel injection device for an internal combustion engine provided with a fuel distribution pipe having a connection portion for electrically connecting each excitation coil to an external terminal.

[0002]

2. Description of the Related Art In a fuel injection type internal combustion engine, fuel in a fuel tank is supplied to a plurality of fuel injection valves via a fuel distribution pipe by a fuel pump. Regarding such a fuel injection device provided with a plurality of fuel injection valves and a fuel distribution pipe, for example, Japanese Patent Application Laid-Open No. 6-10879 discloses an injector, that is, a configuration of a power supply device for a fuel injection valve, which improves the fuel injector. A device has been proposed which aims to make the wiring work easier and improve the appearance. The device includes a plurality of power supply connectors (17) connected to respective power reception connectors (31) of a plurality of injectors, and one input connector (16) for inputting a fuel injection signal from a control computer.
A conductive member (18) for electrically connecting the power supply connector and the input connector; and connecting the plurality of power supply connectors at predetermined intervals corresponding to the plurality of injectors and holding the input connector. And a main body (1) holding a conductive member extending from the input connector to the power supply connector.
1).

[0003] In the above publication, the power supply connector further protrudes from the power supply connector portion, and is formed by bending a metal plate and a plate-like connector pin (171) electrically connected to the input connector. A connector having a connecting metal (24) for electrically connecting the connector pin of the power supply connector and the connector pin (311) of the injector is proposed. The power supply connector, the input connector, and the main body are made of the same material. It is also proposed to be formed integrally. Specifically, the main body 11 is provided with an input connector 16 and a power supply connector 17. The input connector 16 and the power supply connector 17 are connected to a lead wire 18 embedded in a cylindrical wall of the main body 11. Describes that they are connected to each other.

However, a fuel injection device for an internal combustion engine provided with the above-described fuel distribution pipe is disclosed in Japanese Utility Model Application Laid-Open No. 60-1.
It is already known as described in the specification of EP 0877.
That is, in this publication, a fuel delivery pipe (fuel distribution pipe) is provided with a common external connection connector for the excitation coil of each fuel injector (fuel injection valve), and the fuel delivery pipe is connected to the electrode terminal pair of the fuel injector and the external connection connector. It has been proposed to connect by a conductive path along the pipe.

[0005] Specifically, the same specification describes as follows. That is, in FIG. 1, the external connection connector 32 is connected to the pair of electrode terminals 28 and 30 by a conductive path along the fuel delivery pipe 10. That is, the fuel delivery pipe 10 is formed of an insulating material such as a resin, and the conductive plates 34, 3 made of copper or the like as conductive paths.
6 are embedded and fixed in the fuel delivery pipe 10, and the conductive plates 34 and 36 respectively have one end 34 thereof.
a and 36a are connected to the electrode terminals 28 and 30, and the other ends 34b and 36b are connected to the external connection connector 32.

FIGS. 5 and 6 show electrode terminals 2.
A second embodiment using a printed circuit board 38 as a conductive path for connecting the external connection connectors 8 and 30 to the external connection connector 32 is disclosed. The printed circuit board 38 has a conductive plate 46 on one surface and a conductive plate 48 on the other surface.
6 and 48 are described as being connected to the electrode terminals 28 and 30, respectively.

[0007]

SUMMARY OF THE INVENTION The above-mentioned JP-A-6-108
In Japanese Patent Publication No. 79, the term connector may mean its housing or may refer to a terminal,
Not used unambiguously. This is apparent from a comparison between the first and fourth claims.
Eventually, the fuel injection device described in the publication discloses the connector 16,
It can be recognized that the present invention proposes a structure in which the connector pins 17 are connected by lead wires 18. However, in such a structure, when the housing portions of the connectors 16 and 17 are formed integrally with the main body portion, it is necessary to connect the lead wires 18 to the connector pins and embed them in the main body portion, which is still difficult to manufacture. It is. In this regard, the structure described in the specification of Japanese Utility Model Laid-Open No. 60-10877 is also the same.

[0008] In short, the techniques described in the above-mentioned publications and in the specification each have two connector terminals connected via a lead wire or a conductive plate. Therefore, connection work such as soldering is required, which not only increases the number of assembling steps, but also inevitably forms connection portions at both ends of the lead wire or the conductive plate. There is a risk of peeling.

On the other hand, if the two connector terminals and the lead wires (or conductive plates) are formed integrally and made into a conductive member, the connection becomes unnecessary. However, even in the case of such a configuration, manufacturing is not easy because the conductive member needs to be formed so as to conform to the shape of the fuel distribution pipe and appropriately arranged. In particular, it is extremely difficult to use a plurality of conductive members, form terminal portions at both ends thereof, and properly arrange them so as not to contact each other. 60-10
If the printed circuit board described in the specification of Japanese Patent No. 877 as the second embodiment is used, wiring becomes easy, but connection with connector terminals by solder or the like is still required. In addition, the number of parts is large, and the printed circuit board is expensive, which increases the cost.

[0010] Accordingly, the present invention provides a plurality of fuel injection valves,
In a fuel injection device for an internal combustion engine having a fuel distribution pipe for supplying a fuel to each of them and a fuel distribution pipe having a connection portion for electrically connecting each excitation coil of the fuel injection valve to an external terminal. It is an object of the present invention to integrally form a terminal portion and a portion connecting these terminals with a conductive member, and to easily and appropriately accommodate the terminal portion in a fuel distribution pipe.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of fuel injection valves having an excitation coil mounted on each cylinder of an internal combustion engine, and supplying fuel to each of the fuel injection valves. And a fuel distribution pipe having a connection portion for electrically connecting each excitation coil of the fuel injection valve to an external terminal. A conductive member having a first terminal portion to be connected and a second terminal portion connected to the excitation coil, a holding member to hold the conductive member, and a tip of the first terminal portion and the second terminal portion. A housing that integrally accommodates the conductive member and the holding member so as to be exposed and that forms the fuel passage is provided. The holding member and the housing are formed of an insulating material.

In the fuel injection device for an internal combustion engine, the conductive member may include a plurality of conductive plates connecting each excitation coil of the fuel injection valve to the external terminal. It is preferable that at least portions of the plurality of conductive plates forming the first terminal portion and the second terminal portion are arranged side by side. In particular, portions of the plurality of conductive plates that form the first terminal portion and the second terminal portion may be juxtaposed on the same plane.

The holding member may include a first holding member and a second holding member for holding at least a portion where the plurality of conductive plates are arranged in parallel. And at least one of the first holding tool and the second holding tool supports the plurality of conductive plates over substantially the entire length, and the first holding tool and the second holding tool The plurality of conductive plates may be sandwiched between them.
The first and second holders can be configured to hold the plurality of conductive plates by mechanical engagement, but they may be bonded to each other.

[0014]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a fuel distribution pipe provided for a fuel injection device for an internal combustion engine according to one embodiment of the present invention. The housing 1 is a cylindrical body, and a fuel passage 1a (FIG. 2) is formed in a hollow portion. I have. A first connector portion 1c is formed on one side of the side surface of the housing 1, and second connector portions 2a, 2b, 2c, 2d are formed on the opposite side, and the fuel injection valve 4a is formed on the latter side. , 4b,
4c and 4d are mounted. Each fuel injection valve communicates with the fuel passage 1a and has a built-in excitation coil (not shown). The supplied current is controlled, and the amount of fuel injected into the cylinder is controlled.

A sub-assembly 5 shown in FIGS. 7 to 9 is integrally accommodated in the housing 1. The sub-assembly 5 includes a conductive member and a holding member, and will be described below with reference to FIGS. 4 and 5 and FIGS. First, FIG. 4 is an exploded plan view showing a conductive member constituting the sub-assembly 5, and includes a conductive plate 10, a pair of conductive plates 20, and a pair of conductive plates 30, and a first plate shown in FIGS. Holder 60 and second holder 70
Is held by a holding member composed of: Conductive plate 1
0, 20, and 30 each have one direction (left direction in FIG. 4)
Are formed, and second terminal portions 12 to 15, 22, 32 extending in the opposite direction (to the right in FIG. 4) are formed. First of the conductive plate 10
Step portions 11a to 15a are formed in the terminal portion 11 and the second terminal portions 12 to 15, respectively.

The first holder 60 of the present embodiment is a long plate made of an insulator, that is, an insulating material, formed symmetrically in the longitudinal direction, and as shown in the lower half of FIG. , Three grooves 61 to 63 and two wall parts 60a, 6 in the longitudinal direction.
0b are formed, and the conductive plates 10, 2 are interposed therebetween.
0 and 30 are separated (in FIG. 10, the position where each conductive plate is disposed is indicated by a dashed line). Also, the second holder 7
12 is a long plate formed of an insulating material.
13 and is formed so as to be joined to the first holder 60. That is, the conductive plates 10, 20,.
The first holder 30 and the second holder 70 are configured so as to be sandwiched by the first holder 30 and the second holder 70 over substantially the entire length thereof. Although the first holder 60 and the second holder 70 are configured to be mechanically engaged by, for example, a snap connection, they may be fixed using an adhesive or the like. Further, one of the first holder 60 and the second holder 70 may be divided into a plurality of members.

FIG. 6 shows an embodiment according to another combination of the conductive plates 10, 20, and 30. In FIG. 5, the conductive plates 10, 20, and 30 are arranged symmetrically in the vertical direction. In FIG. 6, the terminals are arranged such that the arrangement of the polarities of the terminals is equal. For this reason, in the portion shown by B in FIG. 6, it is necessary to make the conductive plate 10 the same surface after straddling the conductive plate 20, and the dimension L in the width direction of the portion shown by B is smaller than that in the embodiment of FIG. It becomes big.

The conductive plates 10, 20, 3 having the above configuration
When the first holder 60 and the second holder 70 are assembled, the first terminal portions 11, 21, 31 and the second terminal portions 12 to 15, 22, 32 are arranged on the same plane. Established
The sub-assembly 5 shown in FIGS. 7 to 9 is formed.
After the sub-assembly 5 is disposed in the relationship shown in FIG. 1 with respect to the mold (not shown) for the housing 1, the fuel distribution pipe shown in FIGS. The fuel passage 1a is formed. At this time, the housing 1 is connected to the first terminal portions 11 and 12.
1, 31 and second terminal portions 12 to 15, 22, 32
Is formed so that the tip of the first connector part 1 is exposed.
c and the second connector portions 2a to 2d are formed.

FIG. 1 shows the fuel distribution pipe having the above configuration.
As shown in FIG. 2, for example, when the fuel injection valve 4a is attached to the second connector portion 2a, the former terminals 41, 42 are provided.
Are connected to the second terminal portions 12 and 22, respectively, and are electrically connected to external terminals (not shown) via the first terminal portions 11 and 21. Similarly, the fuel injection valve 4b is connected to the second terminal 1
3, 32, and are electrically connected to external terminals via the first terminal portions 11, 31.

When the fuel injection valves 4a to 4d are mounted on the housing 1, the conductive plates 10, 20, 30
No wiring work is required because they are electrically connected. In particular, the first terminal portions 11, 21, 31 and the second terminal portions 12, 22, 32 are formed at both ends of the conductive plates 10, 20, 30, respectively. ,
Not only is it easy to manufacture and assemble, but also a stable connection state is maintained without fear of disconnection or peeling of the joint.

In addition, the conductive plates 10, 20, 30 are formed by the first
Is formed integrally with the housing 1 while being held over substantially the entire length by the holding member including the holding member 60 and the second holding member 70, so that they are appropriately arranged without contacting each other, and the conductive plate 10 , 20, 30 during molding is not required. As described above, since both the first holding tool 60 and the second holding tool 70 in the present embodiment are formed of a single component, they can be easily joined and good workability can be obtained. .

[0022]

Since the present invention is configured as described above, the following effects can be obtained. That is, in the fuel injection device for an internal combustion engine according to claim 1, the conductive member having the first terminal portion connected to the external terminal and the second terminal portion connected to the excitation coil of the fuel injection valve is provided as a holding member. And the conductive member and the holding member are integrally housed in the housing such that the tips of the first and second terminal portions are exposed. Two connector portions including the first and second terminal portions can be formed. Thus, not only is manufacturing easy, but there is no risk of disconnection or separation of the joint between the fuel injection valve and the external terminal, and a stable connection state can be maintained.

Further, as described in claim 2, the conductive member comprises a plurality of conductive plates connecting each excitation coil of the fuel injection valve to an external terminal, and at least the first of the plurality of conductive plates.
In the configuration in which the portions forming the terminal portion and the second terminal portion are arranged side by side, the two connector portions are integrated with the housing near the first terminal portion and the second terminal portion. Since it can be formed in a uniform manner, manufacture is easy.
In addition, since the two connector portions are connected via a plurality of conductive plates, a stable connection state is maintained without fear of disconnection or peeling of the joint portion.

Further, in the fuel injection device according to the third aspect, the holding member includes a first holding member and a second holding member for holding at least a portion where a plurality of conductive plates are arranged in parallel. At least one of the first and second holders supports the plurality of conductive plates over substantially the entire length, and sandwiches the plurality of conductive plates between the first and second holders. Therefore, the plurality of conductive plates can be reliably held by a simple joining operation, and can be appropriately arranged without contacting each other.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a fuel injection device according to one embodiment of the present invention.

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

FIG. 3 is a front view showing a connector section according to the embodiment of the present invention.

FIG. 4 is a plan view showing an assembled state of a conductive plate according to an embodiment of the present invention.

FIG. 5 is a plan view showing a state in which a conductive plate according to one embodiment of the present invention is arranged on a first holder.

FIG. 6 is a plan view showing a state in which a conductive plate according to another embodiment of the present invention is disposed on a first holder.

FIG. 7 is a plan view of a sub-assembly according to an embodiment of the present invention.

FIG. 8 is a left side view of the subassembly according to the embodiment of the present invention.

FIG. 9 is a right side view of the sub-assembly according to the embodiment of the present invention.

FIG. 10 is a plan view showing a half of a first holder in one embodiment of the present invention.

FIG. 11 is a left side view showing a half of a first holder in one embodiment of the present invention.

FIG. 12 is a plan view showing a half of a second holder according to the embodiment of the present invention.

FIG. 13 is a left side view showing a half of a second holder according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Fuel passage 1c 1st connector part 2a, 2b, 2c, 2d 2nd connector part 4a, 4b, 4c, 4d Fuel injection valve 5 Subassembly 10, 20, 30 Conductive plate (conductive member) 11, 21 , 31 First terminal part 12, 22, 32 Second terminal part 60 First holder (holding member) 70 Second holder (holding member)

Claims (3)

[Claims] 1. A fuel injection valve having an excitation coil mounted on each cylinder of an internal combustion engine, a fuel passage for supplying fuel to each of the fuel injection valves, and an excitation of each of the fuel injection valves. A fuel injection device for an internal combustion engine, comprising: a fuel distribution pipe having a connection portion for electrically connecting a coil to an external terminal; a first terminal portion connected to the external terminal and a second terminal connected to the exciting coil. A conductive member having a terminal portion, a holding member for holding the conductive member, and the conductive member and the holding member integrally housed such that tips of the first terminal portion and the second terminal portion are exposed. And a housing forming the fuel passage. 2. The conductive member comprises a plurality of conductive plates for connecting each exciting coil of the fuel injection valve to the external terminal, and at least the first terminal portion and the second conductive plate of the plurality of conductive plates. 2. The fuel injection device for an internal combustion engine according to claim 1, wherein the portions forming the two terminal portions are arranged in parallel. 3. A first holder and a second holder, wherein the holding member sandwiches at least a portion where the plurality of conductive plates are juxtaposed.
And at least one of the first holder and the second holder supports the plurality of conductive plates over substantially the entire length, and the first holder and the second holder 3. The fuel injection device for an internal combustion engine according to claim 2, wherein said plurality of conductive plates are sandwiched between said holders.