JP2004360587A - Fuel supply system structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply system structure not twisting harness. <P>SOLUTION: In the fuel supply system structure for an engine provided with a fuel tube 4 provided with a plurality of branching parts connecting a plurality of fuel injection valves 1 in parallel and harness 3 extended from one end side of a crankshaft along a plane surface parallel to the crankshaft and transmitting fuel injection signal to the fuel injection valve 1, the fuel tube 4 is provided with offsetting from a plane surface constructed with including shafts of the plurality of fuel injection valves 1, and the harness 3 is extended in such a manner of including the plane surface constructed with including the shafts of the plurality of fuel injection valves 1 over whole length of the harness 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a structure for mounting a fuel tube and a fuel injection valve.
[0002]
[Prior art]
A fuel distribution pipe that supplies fuel to a plurality of fuel injection valves is connected at the upper end of the fuel injection valve, and a fuel distribution pipe extending in the direction of each cylinder passes directly above the fuel injection valve disclosed in Patent Document 1. Have been.
[0003]
[Patent Document 1]
59-54291
[0004]
[Problems to be solved by the invention]
A harness for transmitting a fuel injection signal is connected to each fuel injection valve. However, when the fuel injection valve is directly mounted on the cylinder head, the fuel injection valve is arranged in a narrow space. If the fuel distribution pipe is placed directly above the injection valve, the harness must be twisted when connecting the harness attached along the fuel distribution pipe to the fuel injection valve, and the harness will be subjected to excessive force and will be disconnected. There is a problem. That is, when the fuel injection valve 1 is attached to the branch portion 10 of the intake passage 8 as shown in FIG. 4, since there is a sufficient space between the rocker cover 6 and the intake passage 8, the fuel distribution pipe is connected to the fuel distribution pipe. There is no problem if the harness 3 and the harness connector 2 are attached to the rocker cover 6 side by side after being connected to the upper end of the injection valve 1, but if the fuel injection valve 1 is directly mounted on the cylinder head 7 in this state. The harness connector 2 contacts the rocker cover 6 as shown in FIG. Therefore, if the mounting position of the harness connector 2 is shifted (rotated) so that the plane connecting the center axis of the harness connector 2 and the center axis of the fuel injection valve 1 becomes a plane spreading in the longitudinal direction of the fuel tube 4, the harness connector The fuel injection valve 2 does not come into contact with the rocker cover 6, and the fuel injection valve 1 can be connected to a narrow space between the rocker cover 6 and the intake port 5. However, in this case, as shown in FIG. 6, since the fuel tube 4 is located right above the fuel injection valve 1, when the harness 3 is connected to the harness connector 2, a large twist is generated in the harness 3.
You.
[0005]
The present invention has been proposed to solve such a problem, and an object of the present invention is to provide a fuel tube structure in which a twist of a harness connected to a fuel injection valve is reduced.
[0006]
[Means for solving the problem]
According to the present invention, a fuel tube provided with a plurality of branches adjacent to the fuel injection valve for connecting the plurality of fuel injection valves in parallel, and a fuel tube extending along a plane parallel to the crankshaft, And a harness for transmitting an injection signal, wherein the fuel tube in the vicinity of the branch portion is provided offset from a plane including the axes of the plurality of fuel injection valves, and the harness includes a plurality of fuel lines. It is characterized in that a plane including the axis of the injection valve is included over the entire length of the harness.
[0007]
[Action and effect]
ADVANTAGE OF THE INVENTION According to this invention, when attaching a harness to a fuel injection valve, it can connect to a fuel injection valve without twisting, with the harness attached to the fuel tube.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment in which the present invention is applied to a 6-cylinder V-type engine will be described with reference to FIGS.
[0009]
In FIG. 1 showing a cross section viewed from the crankshaft direction, the fuel injection valve 1 has a cylinder in which the cylinder axis and the intake port axis form an acute angle (θ <90 °) and are sandwiched between the intake port 5 and the head cover 6. It is directly attached to the head 7 and injects fuel into the intake port 5. An intake passage 8 is connected to the intake port 5, and a mixture of air introduced from the intake passage 8 and fuel injected from the fuel injection valve 1 is opened by opening an intake valve (not shown) in a cylinder during an intake stroke. Supply within. A fuel tube 4 is connected to an upper end of the fuel injection valve 1 opposite to the fuel injection hole 1a. A harness 3 for transmitting a fuel injection control signal to the fuel injection valve 1 and a fuel harness connector 2 connected.
[0010]
As shown in FIG. 2, three fuel injection valves 1 are provided in each of the two linear fuel tubes 4, and are substantially uniform in the vicinity of the fuel injection valve 1, corresponding to each cylinder (not shown). It is attached to the protruding portion 4a which becomes a branch provided at intervals. As described above, the fuel tubes 4 to which the plurality of fuel injection valves 1 are connected in parallel extend in a straight line in the direction of each cylinder row that coincides with the direction of the crankshaft (not shown). A harness 3 for transmitting a fuel injection signal to each fuel injection valve 1 includes a harness straight portion 3a attached along a longitudinal direction of the fuel tube 4 by a fastener 9, that is, an axial side surface 4b of the fuel tube 4, and a harness connector. 2 and a harness curved portion 3b connecting the harness straight portion 3a, and extends from one end of a not-shown crankshaft along a plane parallel to the not-shown crankshaft. The harness 3 and the fuel injection valve 1 are connected via a harness connector 2 by a harness curve portion 3b. The harness connector 2 is provided on the side of the fuel injection valve 1 extending in the longitudinal direction of the fuel tube 4 so as not to come into contact with the rocker cover 6 near the connection between the fuel injection valve 1 and the fuel tube 4.
[0011]
FIG. 3 is a schematic diagram viewed from the arrow A (in the crankshaft direction) in FIG. The upper end near the opposite end of the injection port of the fuel injection valve 1 is connected to a protruding portion 4a provided on the fuel tube 4 so that fuel can be supplied to the inside thereof. The fuel tube 4 in the vicinity of the branch portion is positioned on a plane including a plurality of axes of the plurality of fuel injection valves 1 so that the harness straight portion 3a along the fuel tube 4 passes substantially directly above the fuel injection valve 1. Offset. On the other hand, the harness 3 including the straight portion 3a and the curved portion 3b is extended so as to include a plane including a plurality of axes of the plurality of fuel injection valves 1 over its entire length. Here, as shown in FIG. 1, a rocker cover 6 is provided near the fuel injection valve 1, the offset direction of the fuel tube 4 does not contact the rocker cover 6, and there is no problem in attaching and detaching the rocker cover 6. The direction is away from the cylinder row provided with the fuel injection valve 1 to which the fuel tube 4 is connected. A surface connecting the central axis of the harness connector 2 and the central axis of the fuel injection valve 1 is a plane extending in the longitudinal direction of the fuel tube 4, that is, the axial direction of the fuel tube 4. Is provided over the entire length of the harness connector 2. Furthermore, since the axis of the harness straight portion 3a extending substantially in parallel with the fuel tube 4 is also located on this plane, when the harness curved portion 3b is connected to the harness connector 2, the harness 3 can be connected with almost no twist. it can. Further, the width of the harness curved portion 3a projecting in a direction perpendicular to the longitudinal direction of the fuel tube 4 can be reduced.
[0012]
At the time of assembling, the harness 3 and the fuel tube 4 are integrally fastened by fasteners 9 to assemble the fuel supply system components including the fuel injection valve 1 as an integral part, and then attached to the cylinder head 7.
[0013]
When the fuel injection valve 1 is attached to the cylinder head 7 in this way, the fuel supplied to the fuel injection valve 1 from the fuel tube 4 operates the fuel injection valve 1 based on a signal transmitted from the harness 3. Accordingly, fuel is injected from the fuel injection holes 1a and fuel is injected near the intake valve, so that fuel can be efficiently taken into the combustion chamber during the intake stroke.
[0014]
The effects of the embodiment of the present invention will be described.
[0015]
In the present invention, the fuel tube 4 is provided offset from the center axis of the fuel injection valve 1 so that the straight harness portion 3a attached along the side surface 4b of the fuel tube 4 passes almost directly above the fuel injection valve 1. The surface connecting the central axis of the connector 2 and the axis of the harness straight portion 3a is provided so as to be a plane extending in the longitudinal direction of the fuel tube 4, that is, the axial direction of the fuel tube. As a result, the harness curve portion 3b can be connected to the harness connector 2 without twisting, so that no unreasonable force is applied to the harness 3 and the disconnection of the harness 3 is prevented even when the engine is vibrated. be able to.
[0016]
In addition, since the plane connecting the central axis of the fuel injection valve 1, the axis of the harness straight portion 3a, and the central axis of the harness connector 2 is a plane that extends in the longitudinal direction of the fuel tube 4, this is viewed from the engine crank axis direction. The width in which the harness connector 2 and the harness 3a protrude in the direction orthogonal to the direction is small, so that the fuel injection valve 1 can be directly attached to the cylinder head 7 without interfering with the rocker cover 6 or the like.
[0017]
Furthermore, by assembling the harness 3 along the fuel tube 4 as an integral part in advance, the assembly work when mounting the fuel injection valve 1 to the cylinder head 7 can be simplified and the number of parts can be reduced.
[0018]
The present invention is not limited to the above-described embodiment, but includes various modifications and improvements that can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an attached state of an embodiment of the present invention.
FIG. 2 is a perspective view of the embodiment.
FIG. 3 is a partially enlarged view of the fuel injection valve of the embodiment.
FIG. 4 is a reference diagram showing an example of a mounting state of a fuel injection valve.
FIG. 5 is a reference view in which the example of the fuel injection valve of FIG. 4 is directly attached to a cylinder head.
FIG. 6 is a reference diagram showing an example in which the position of a harness connector of a fuel injection valve is changed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fuel injection valve 1a Fuel injection hole 2 Harness connector 3 Harness 3a Harness straight part 3b Harness curve part 4 Fuel tube 4a Projection 4b Side surface 5 Intake port 6 Rocker cover 7 Cylinder head 8 Intake passage 9 Fastener 10 Branch part

Claims (6)

A fuel tube provided with a plurality of branch portions close to the fuel injection valve for connecting a plurality of fuel injection valves in parallel,
A harness extending from one end of the crankshaft along a plane parallel to the crankshaft and transmitting a fuel injection signal to the fuel injection valve;
The fuel tube near the branch portion is provided offset from a plane including a plurality of axes of the plurality of fuel injection valves,
The fuel supply system structure, wherein the harness is extended to include a plane including a plurality of axes of the plurality of fuel injection valves over the entire length of the harness. The harness connector for connecting the harness and the fuel injection valve is provided so as to include a plane including a plurality of axes of the plurality of fuel injection valves over the entire length of the harness connector. The fuel supply system structure according to claim 1, wherein The fuel supply system structure according to claim 1, wherein the harness is attached along at least a part of the fuel tube. 4. The fuel supply system according to claim 1, wherein an offset direction of the fuel tube is a direction away from a cylinder row provided with the fuel injection valve to which the fuel tube is connected. 5. Construction. The fuel supply system structure according to any one of claims 1 to 4, wherein the fuel tube and the harness are provided near an opposite end of an injection port of the fuel injection valve. The fuel supply system structure according to claim 3, wherein the harness disposed along the fuel tube is integrally fastened to the fuel tube.

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