JP2003206822A - Fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device which prevents a plurality of injectors from falling from a fuel distribution pipe and being easily assembled. <P>SOLUTION: A plurality of distribution ports 22 of the fuel distribution pipe 20 are arranged on a virtual straight line S, and support parts 26a and 26b for supporting a stopper member 50 are disposed on the fuel distribution pipe 20. The stopper member 50 is mounted on the support parts 26a and 26b so as to extend in parallel with the virtual straight line S. When one of the injectors 30 moves in the separation direction X, the stopper member 50 locks a connector 34 of the injector 30 in a range where a fuel flow inlet of the injector 30 does not separate from the distribution ports 22. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine") from a fuel injection device (hereinafter referred to as "fuel injection device" is referred to as an injector) assembled to a fuel distribution pipe.
Is referred to as an engine) for injecting fuel into each cylinder.

[0002]

2. Description of the Related Art Conventionally, there has been known a fuel supply system in which a fuel inlet of an injector is inserted into each of a plurality of distribution ports of a fuel distribution pipe for distributing fuel to each cylinder of an engine, and fuel is injected from each injector to each cylinder. Has been. The injector is fixed by being sandwiched between the engine and the fuel distribution pipe.

In the above-mentioned assembly structure in which the injector is inserted into the engine and the fuel distribution pipe, when a large impact due to a collision of a vehicle or the like is applied to the place where the injector is inserted into the engine and the fuel distribution pipe, the fuel distribution pipe is removed. The injector may fall off. Further, since the injector is likely to fall off from the fuel distribution pipe, there is a problem that it is difficult to convey the injector with the injector inserted in the fuel distribution pipe before assembling to the engine.

[0004]

Therefore, conventionally, a connecting member such as a clip is fitted to the fuel distribution pipe and the injector,
A technique is known in which the injector is connected so that the injector does not drop out from the fuel distribution pipe. According to this technique, for example, the coupling member is first fitted into the distribution port of the fuel distribution pipe, and then the fuel inlet port of the injector is fitted into the coupling member. Generally, fitting a distribution port and a fuel inlet port to a small-sized coupling member is not an easy task, and such a fitting task must be performed twice for each injector. Met. An object of the present invention is to provide a fuel supply device which can prevent a plurality of injectors from falling off from the fuel distribution pipe and can be easily assembled.

[0005]

According to the fuel supply device of the first aspect of the present invention, the plurality of distribution ports of the fuel distribution pipe are arranged so as to be aligned on a virtual straight line, and the fuel distribution pipe is
It has a support part which supports a stopper member. The stopper member is attached to the support portion so as to extend parallel to the virtual straight line, and when any of the plurality of injectors moves in the disengagement direction in which the fuel inlet is disengaged from the distribution port, the fuel inlet is separated from the distribution port. The locked portion of any one of the injectors is locked within a range where it does not separate. Therefore, even if each injector moves in the detaching direction, the stopper member locks the locked portion of each injector, so that the fuel inlet of each injector does not separate from the distribution port. Therefore, the plurality of injectors can be prevented from falling off from the fuel distribution pipe. In addition, for example, after inserting the fuel inlets of the injectors into the distribution ports of the fuel distribution pipe, the stopper member is mounted on the support portion as described above, whereby the assembly can be easily performed.

According to the fuel supply device of the second aspect of the present invention, since the stopper member is formed in a rod shape and is fitted in the support hole of the support portion, it can be easily mounted on the support portion. . According to the fuel supply apparatus of the third aspect of the present invention, the rod-shaped stopper member has its outer peripheral surface abutting on the flat surface of the locked portion facing the detaching direction to lock the locked portion. . Therefore, the function of preventing the injector from falling off can be realized with a simple configuration.

According to the fourth aspect of the fuel supply apparatus of the present invention, since the bracket for fixing the fuel distribution pipe to the engine also serves as the support portion, it is not necessary to newly provide the support portion for the fuel distribution pipe. According to the fuel supply device of the fifth aspect of the present invention, since the connector that supplies electric power to the electric drive portion of the injector also serves as the locked portion, it is not necessary to newly provide the locked portion in the injector. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment showing an embodiment of the present invention will be described below with reference to the drawings. A fuel supply device according to an embodiment of the present invention is shown in FIGS. The fuel supply device 10 includes a fuel distribution pipe 20, a plurality of injectors 30, and a stopper member 50.

The fuel distribution pipe 20 forms a conveying path 21 for conveying fuel in the direction A of FIGS. 1 and 2. Fuel distribution pipe 2
0 has a plurality of distribution ports 22 for distributing fuel to each cylinder of the engine. The distribution ports 22 are arranged so as to be arranged on a virtual straight line S parallel to the axis of the transport path 21 in the fuel transport direction A. Each distribution port 22 is formed in a substantially cylindrical shape projecting from the outer wall of the fuel distribution pipe 20 to the same side, and each inner hole 24 communicates with the transport path 21. Each distribution port 2
The central axes of 2 are perpendicular to the virtual straight line S and parallel to each other.

The fuel distribution pipe 20 has two brackets 26.
It has a and 26b integrally with the pipe body. One bracket 26a is provided between the distribution port 22 between the most downstream side of the transport path 21 and the upstream side thereof. The other bracket 26b is provided between the one of the distribution ports 22 on the most upstream side of the transport path 21 and the one adjacent to the downstream side. The hole forming portions 27 of the brackets 26a and 26b project from the outer wall of the fuel distribution pipe 20 to the same side as the distribution port 22. The hole forming portion 27 has a circular support hole 2
8 penetrates. The brackets 26 a and 26 b support the stopper member 50 fitted in the support hole 28.
The fixing portion 29 of the brackets 26a and 26b is the hole forming portion 27.
In contrast, it is bent and formed. As shown in FIG. 3, the fuel distribution pipe 20 is a fixing portion 29 of each bracket 26a, 26b,
It is bolted to the intake manifold 40 of the engine.
The brackets 26a and 26b also serve as "supporting portions" described in the claims.

Each injector 30 has a fuel inlet 31 into which fuel flows from one distribution port 22 of the fuel distribution pipe 20. The fuel inlet 31 is formed in a substantially cylindrical shape, and the inner hole 32 communicates with the fuel passage in the injector 30.
The fuel inlet 31 is coaxially inserted into the distribution port 22 and is movable on both sides in the axial direction and rotatable about the axis. When the fuel inlet 31 is inserted into the distribution port 22, the inner hole 32 of the fuel inlet 31 communicates with the inner hole 24 of the distribution port 22, and the fuel in the fuel distribution pipe 20 is distributed to the distribution port 22 and the fuel inlet port. 31
Through the fuel passage. A seal member 39 seals between the fuel inlet 31 and the distribution port 22.
As shown in FIG. 3, the nozzle 33 of each injector 30 is inserted into the intake manifold 40 and sealed by the seal member 41.

The injector 30 is electrically driven, and controls the lift of the nozzle needle by controlling the current supplied from the connector 34 to the coil, and injects the fuel flowing into the fuel passage from the nozzle 33 into the cylinder of the engine. .
The connector 34 is formed on the outer wall of the injector 30 so as to project, and cannot be displaced relative to the fuel inlet 31. Of the outer wall surface of the connector 34, a flat surface 36 that faces the separation direction (indicated by X in FIGS. 1 and 2) in which the fuel inlet 31 separates from the distribution port 22 is formed perpendicular to the separation direction X. .

The stopper member 50 is formed in a rod shape having a circular cross section. The stopper member 50 includes the distribution port 22 and the injector 30 on the most upstream side of the transport path 21.
Is longer than the distance between the central axes of the distribution port 22 and the injector 30 on the most downstream side. The stopper members 50 are provided at two positions in the longitudinal direction, and support holes 28, 2 of the brackets 26a, 26b are provided.
8 respectively. Accordingly, the stopper member 50 is attached to the brackets 26a and 26b so as to extend in parallel to the virtual straight line S. In this mounted state, the outer peripheral surface 51 of the stopper member 50 has each fuel injector 3 with the fuel inlet 31 inserted to a predetermined position of the distribution port 22.
0 facing the flat surface 36 of the connector 34. Outer peripheral surface 51
The shortest distance d between the flat surface 36 and the flat surface 36 is set to be the same as the distance that the seal member 39 of the fuel inlet 31 can move in the separation direction X with respect to the distribution port 22 without separation. Therefore, even if any of the injectors 30 moves in the disengagement direction X, the flat surface 36 of the connector 34 comes into contact with the outer peripheral surface 51 of the stopper member 50 and is locked within a range in which the fuel inlet 31 does not disengage from the distribution port 22. Therefore, a part of the fuel inlet 31 is retained in the distribution port 22 and does not separate from the distribution port 22. The connector 34 also serves as the "locked portion" described in the claims.

Restricting portions 54a and 54b are provided at two positions in the longitudinal direction of the stopper member 50. One regulation part 5
4a is formed by making the outer diameter of the stopper member 50 larger than that of the support hole 28. The restriction portion 54a is the bracket 26b in the hole forming portion 27 of the bracket 26a.
It is opposite to the opposite side with a slight gap. The other restricting portion 54b is formed by fitting and fixing a ring having an outer diameter larger than that of the support hole 28 (hereinafter, also referred to as ring 54b) to the stopper member 50. The restriction portion 54b is
Bracket 2 in hole forming portion 27 of bracket 26b
It faces the side opposite to 6a with a slight gap.
The axial movement of the stopper member 50 is regulated by the regulation portion 54a coming into contact with the hole forming portion 27 of the bracket 26a or the regulation portion 54b coming into contact with the hole forming portion 27 of the bracket 26b.

The outer peripheral surface 51 of the stopper member 50 is in contact with the side wall surface 38 of the injector 30 perpendicular to the flat surface 36 of the connector 34 on the front side of the flat surface 36 in the separating direction. As a result, rotation of the fuel inlet 31 with respect to the distribution port 22 is blocked, and rotation of the injector 30 is blocked.

Next, a method of assembling the plurality of injectors 30 into the fuel distribution pipe 20 to assemble the fuel supply device 10 will be described. (1) The fuel inlet 31 of each injector 30 is inserted to the predetermined position of each distribution port 22. (2) Stopper member 50 with no ring 54b attached
Is inserted into the support hole 28 of the bracket 26a from the end portion of the ring 54b closer to the intended mounting site than the restriction portion 54a, and then inserted into the support hole 28 of the bracket 26b.
Cross-sectional shape of stopper member 50 and each support hole 28, 28
Since the shape is circular, the stopper member 50 can be inserted into the support holes 28, 28 without having to worry about the rotational position around the axis. The stopper member 50 is inserted just before or until the regulating portion 54a comes into contact with the hole forming portion 27 of the bracket 26a. (3) The ring 54b is fitted and fixed at a predetermined position of the stopper member 50 to form the regulation portion 54b.

After inserting the fuel inlet 31 of each injector 30 into each distribution port 22 in this way, the stopper member 50 is inserted.
The fuel supply device 10 can be easily assembled by simply attaching the brackets to the brackets 26a and 26b. Moreover, the stopper member 50 is attached by the rod-shaped stopper member 5
It can be performed by a simple operation of inserting 0 into the support holes 28, 28 of the brackets 26a, 26b. Therefore, the assembly efficiency of the fuel supply device 10 is improved, and the cost of the fuel supply device 10 can be reduced.

In the fuel supply device 10 assembled as described above, even if any of the injectors 30 moves in the disengagement direction X due to a force resulting from a vehicle collision or the like, the connector 34 of the injector 30 is stopped by the stopper member. When 50 is locked, the fuel inlet 31 does not separate from the distribution port 22. Therefore, it is possible to reliably prevent the plurality of injectors 30 from falling off the fuel distribution pipe 20. Further, since the plurality of injectors 30 can be permanently attached to the fuel distribution pipe 20 before the fuel supply device 10 is assembled to the engine, the injectors 30 can be easily removed without falling off from the fuel distribution pipe 20. The fuel supply device 10 can be transported.

Further, in the fuel supply device 10, the function of preventing the fuel distribution pipe 20 from falling off is realized by the contact between the outer peripheral surface 51 of the stopper member 50 and the flat surface 36 of the connector 34, so that the structure thereof can be simplified. In addition, the function of preventing the fuel distribution pipe 20 from falling off is provided on the injector 30 with the existing connector 34.
Since it is realized by utilizing, it can be manufactured at a low cost as compared with the case where a locked portion which replaces the connector is newly provided. Furthermore, in the fuel supply device 10, since the existing brackets 26a and 26b are used as the support portions of the stopper member 50 in the fuel distribution pipe 20, it can be manufactured at a lower cost than when a new support portion is provided instead of the brackets 26a and 26b. .

In the embodiment described above, the brackets 26a, 2a for fixing the fuel distribution pipe 20 to the engine.
Although 6a also serves as the support portion, the support portion may be provided separately from such a bracket. The support portion may be formed integrally with the main body of the fuel distribution pipe as in the above embodiment, or may be formed separately.

Further, although the rod-shaped stopper member 50 is used in the above-mentioned embodiment, for example, a plate-shaped stopper member may be adopted. When a rod-shaped stopper member is used, the cross-sectional shape thereof may be a polygon such as a hexagon other than the circle as in the above embodiment. Further, as the shape of the support hole into which the rod-shaped stopper member is fitted, a shape corresponding to the cross-sectional shape of the stopper member can be appropriately adopted. The support hole may be any shape as long as it can be fitted with the stopper member, and is formed in a shape that is closed in the circumferential direction such as a circular shape, or is formed in a shape that is partially opened in the circumferential direction such as an arc shape. May be.

Further, in the above embodiment, the connector 34 for supplying electric power to the electric drive portion of the injector 30 also serves as the locked portion, but the locked portion may be provided separately from such a connector. . Further, as the locking structure between the stopper member and the locked portion, in addition to the structure in which the curved outer peripheral surface of the stopper member and the flat surface of the locked portion are brought into contact with each other as in the above embodiment, for example, a stopper member The curved outer peripheral surface or the flat surface may be brought into contact with the curved surface of the locked portion, or the structure in which the other is fitted in the groove provided in one of the stopper member and the locked portion may be adopted. May be adopted.

[Brief description of drawings]

FIG. 1 is a front view showing a fuel supply device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a main part of a fuel supply device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where a fuel supply device according to an embodiment of the present invention is assembled to an engine.

[Explanation of symbols]

10 Fuel supply device 20 Fuel distribution pipe 22 Distribution port 26a, 26b Bracket (supporting part) 28 Support holes 30 injectors 34 Connector (Locked part) 36 Flat surface of connector 50 Stopper member 51 Outer peripheral surface of stopper member X departure direction

Claims (5)

[Claims] 1. A fuel distribution pipe having a plurality of distribution ports for distributing fuel to each cylinder of an internal combustion engine; and a locked portion, wherein a fuel inlet port is inserted into the distribution port and assembled, A fuel supply device comprising: a plurality of electrically driven fuel injection devices for injecting fuel supplied through a mouth into the cylinder; and stopper members capable of locking respective locked parts of the plurality of fuel injection devices. And the plurality of distribution ports are arranged so as to be aligned on a virtual straight line, the fuel distribution pipe has a support portion that supports the stopper member, and the stopper member is parallel to the virtual straight line. Within a range in which the fuel inlet does not separate from the distribution port when any of the plurality of fuel injection devices moves in the separation direction in which the fuel inlet is separated from the distribution port. With any of the above The fuel supply apparatus characterized by locking the the engaged portion of the injector. 2. The fuel supply device according to claim 1, wherein the stopper member is formed in a rod shape and is fitted in a support hole of the support portion. 3. The stopper member has an outer peripheral surface thereof which abuts a flat surface of the locked portion facing the detaching direction to lock the locked portion. Fuel supply device. 4. The fuel supply device according to claim 1, wherein a bracket for fixing the fuel distribution pipe to the internal combustion engine also serves as the support portion. 5. The fuel supply device according to claim 1, wherein a connector that supplies electric power to the electric drive unit of the fuel injection device also serves as the locked portion. .