JPH07103104A - Mounting structure of fuel delivery pipe - Google Patents

Abstract

PURPOSE:To provide the mounting structure of the delivery pipe for feeding oil to an injection of an engine which provides efficient mounting work. CONSTITUTION:A screw hole 1b is formed in the periphery wall of a fuel delivery pipe 1, in which connecting holes 1a for a fuel injector 2 are formed at an interval, in the direction perpendicular to the connecting holes 1a. Also the fuel delivery pipe 1 is positioned inside the bent branch 9 of an intake manifold block 4, and a screw 7 is inserted into a screw hole 1b to tighten the pipe to the intake manifold block 4. Because the tightening direction of the screw 7 is changed, restriction on the layout of the intake manifold block 4 and a surge tank 8 is relieved, sufficient length of port can be secured, and also performance can be increased. In addition, because the intake manifold block 4 can be formed integrally without dividing it, cost and weight are reduced effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel delivery pipe mounting structure for a vehicle engine equipped with a multi-point injection type fuel supply device.

[0002]

2. Description of the Related Art An engine having a multi-point injection type fuel supply device has a fuel delivery pipe (hereinafter referred to as a delivery pipe) for supplying fuel to a fuel injector (hereinafter referred to as an injector) provided in each cylinder. I'm using it. As shown in FIGS. 6 and 7, the peripheral structure of this engine is such that the delivery pipe 1 is arranged in the cylinder arrangement direction and the injector 2 is arranged.
Is fitted into a connection hole 1a provided at a distance in the delivery pipe 1.

As shown in FIGS. 8 and 9, the delivery pipe 1 is provided with connection holes 1a of the injector 2 at equal intervals in the axial direction, and a connection pipe 3 is provided on one side of the connection holes 1a. A screw hole 1b is formed in the peripheral wall of the delivery pipe 1 in the same direction as the connection hole 1a. Similarly, the delivery pipe 1 shown in FIG. 10 and FIG.
Are formed. In both of these two delivery pipes 1, a screw hole 1b is arranged on one side of the connection hole 1a.

When the delivery pipe 1 is attached to the intake manifold block 4, a mounting bracket 5 is provided on the intake manifold block 4, as shown in FIGS. When mounting the delivery pipe 1 on the cylinder head, a mounting bracket 5 is provided on the cylinder head.

The delivery pipe 1 is fixed to the mounting bracket 5 with screws 7 via the insulator 6.
At this time, the surge tank 8 is connected to the intake manifold block 4 after the mounting work is completed. Such a mounting structure is also disclosed in Japanese Utility Model Publication No. 2-124261.

[0006]

When the delivery pipe 1 shown in FIGS. 8 and 9 is mounted on the intake manifold block 4, the injector 2 is fitted in the connection hole 1a, and the insulator 6 is screwed while the insulator 6 is being pressed by the delivery pipe 1. 7
It will be a work to tighten. However, since the delivery pipe 1 is arranged inside the bent branch 9 of the intake manifold block 4, the screw hole 1b and the connection hole 1a have the same direction, which makes it difficult to adjust the positional deviation, and the work efficiency is high. Was being lowered. In addition, the intake manifold block 4 and the surge tank 8 around the tightening part
Since the space for tightening is small, the height of the surge tank 8 is suppressed or the intake manifold block 4 is constrained to be divided from the arrow A in the drawing.

An object of the present invention is to provide a delivery pipe mounting structure for improving the efficiency of mounting work.

[0008]

In order to achieve the above object, the present invention provides a screw hole in a peripheral wall of a fuel delivery pipe in which connection holes of a fuel injector are provided with a space therebetween in a direction orthogonal to the connection hole. The fuel delivery pipe is formed inside the bent manifold of the intake manifold block, and a screw is passed through the screw hole to be fastened to the intake manifold block or the cylinder head.

In addition to the above structure, screw holes are formed parallel to both sides of the fuel delivery pipe.

[0010]

Since the present invention is configured as described above, when the fuel injector is assembled to the fuel delivery pipe and disposed in the intake manifold block, the screw hole and the mounting bracket of the intake manifold block easily correspond to each other. Since the tightening direction of the screws does not intersect the surrounding intake manifold block, the screw tightening work becomes easy.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the delivery pipe 1
Is a bent inner side of the branch 9 of the intake manifold block 4, and the connection hole 1a for assembling the injector 2 is a mounting hole formed in the cylinder side plate 10 of the branch 9.
It corresponds to 10a.

The delivery pipe 1 is provided with connection holes 1a at intervals in the axial direction, and a connection pipe 3 is projected on one side. The other side is closed. Further, screw holes 1b are formed on both sides and the central portion of the peripheral wall in a direction orthogonal to the connection hole 1a, and the screw hole 1b in the central portion and the screw holes 1b on both sides are separated on both sides of the delivery pipe 1. A mounting bracket 5 is provided on the intake manifold block 4 in correspondence with the screw hole 1b.

To assemble the delivery pipe 1 to the intake manifold block 4, first, the delivery pipe 1
Assemble the injector 2 on. And the injector 2
With the cushion 11 inserted at the tip and the injector 2 still attached to the delivery pipe 1,
Mount the tip on the intake manifold block 4 side 10
plug into a. Next, the insulator 6 is fitted into the screw hole 1b of the delivery pipe 1 and the recesses 1c and 5a of the mounting bracket 5. Since the insulator 6 has a knock structure in which the convex portion 6a that fits into both the concave portions 1c and 5a is provided, the delivery pipe 1 does not come off even if the hand is released in this state, and therefore the temporary assembly is possible. The fastening work of 7 becomes easy.

Further, the delivery pipe 1 shown in FIG. 4 and FIG.
The same applies to the case where the screw holes 1b are attached, but even when the screw holes 1b are arranged side by side on one side of the delivery pipe 1, the fastening operation of the screws 7 becomes easy.

As described above, in the structure in which the mounting direction of the screw 7 is directed to the inside of the branch 9, the screw 7 can be tightened without being influenced by the shape of the intake manifold block 4, and therefore the intake manifold block 4 is integrated. Since it can be molded, the production cost can be reduced.

[0016]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the tightening direction of the screw is changed, the restrictions on the layout of the intake manifold block and the surge tank are relaxed, the port length is sufficiently long, and the performance is improved. Can be improved. Further, since the intake manifold block can be integrally molded without being divided, there are effects of cost reduction and weight reduction. Furthermore, it becomes easier to set the position of the screw hole, and by arranging the screw holes on both sides of the delivery pipe,
Vibration resistance is better than before.

[Brief description of drawings]

FIG. 1 is a development view showing a mounting structure of a fuel delivery pipe according to an embodiment of the present invention.

FIG. 2 is a side view showing a mounting structure of the fuel delivery pipe shown in FIG.

FIG. 3 is a perspective view showing a mounting structure of a fuel delivery pipe of another embodiment.

FIG. 4 is a side view showing the shape of the fuel delivery pipe shown in FIG.

5 is a side view showing the shape of the fuel delivery pipe shown in FIG.

FIG. 6 is a perspective view showing a conventional fuel delivery pipe mounting structure.

FIG. 7 is a side view showing a mounting structure of the fuel delivery pipe shown in FIG.

FIG. 8 is a side view showing the shape of the fuel delivery pipe shown in FIG.

9 is a side view showing the shape of the fuel delivery pipe shown in FIG.

FIG. 10 is a side view showing the shape of another conventional fuel delivery pipe.

11 is a side view showing the shape of the fuel delivery pipe shown in FIG.

[Explanation of symbols]

 1 Fuel delivery pipe 1a Connection hole 1b Screw hole 2 Fuel injector 4 Intake manifold block 7 Screw 9 Branch

Claims (2)

[Claims] 1. A fuel delivery pipe in which connection holes of a fuel injector are provided at intervals, is provided with a threaded hole in a direction orthogonal to the connection hole, and the fuel delivery pipe is bent at a branch of an intake manifold block. A mounting structure for a fuel delivery pipe, characterized in that the fuel delivery pipe is arranged inside and is fastened to the intake manifold block or the cylinder head by passing a screw through the screw hole. 2. The mounting structure for a fuel delivery pipe according to claim 1, wherein the screw holes are formed parallel to both sides of the fuel delivery pipe.