JPH1122575A - Delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate any joint and prevent fuel from leaking through the joint, by integrally forming a pipe body, in a delivery pipe where an injector cup is disposed in the lower part of the pipe body with which a guide pipe communicated with a fuel tank is connected. SOLUTION: In a delivery pipe 10, a fuel distributing pipe installed in the proximity to an internal combustion engine, its pipe body 11 is tubular and both ends are closed with a cap 12. A guide pipe 14 is connected to one end 13 of the pipe body and a substantially tubular injector cup 15... is arranged in the lower part of the pipe body 11. The pipe body 11 is a tubular pipe which has substantially L-shaped cross section and, preferably, has a hollow part, and it is molded integrally by press-working a round pipe. By molding the pipe body 11 to be substantially L-shaped, the volume of the upper part of the pipe body 11 is decreased to reduce accumulated air in a condition of its mounting to a vehicle, and good engine start is provided. In addition, a mounting hole 19 is installed in the top surface of the pipe body 11, and an projection 20 of a mounting member 16 is fitted into this mounting hole 19 and fixed by welding or others.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delivery pipe which is a fuel distribution pipe provided near an internal combustion engine of a vehicle.

[0002]

2. Description of the Related Art In a vehicle such as a four-wheeled vehicle or a two-wheeled vehicle having a fuel injection type internal combustion engine, a delivery pipe is arranged near the internal combustion engine as a fuel distribution pipe. 6 and 7 are a front view and a bottom view of a conventional delivery pipe.
FIG. 8 is an enlarged cross-sectional view taken along line CC of FIG.
FIG. 9 is an enlarged cross-sectional view taken along line DD of FIG.

[0003] The delivery pipe 101 includes a flange 102.
, A main body 105 having a substantially L-shaped cross section having a hollow portion 104, an injector cup 106 installed below the main body 105, and an upper surface of an end 107 of the main body 105. Conduit 108. The mounting portion 103 has a flange 102 on an upper portion, and a pressure regulator (not shown) is mounted on the flange 102. On the other hand, the mounting portion 10
A cylindrical projection 109 is provided at a lower portion of the main body 3, and is fitted and fixed in a hole provided in the main body 105. The main body 105 is formed by press-forming a metal flat plate into a substantially U-shape and a substantially W-shape, fitting each other with their openings facing each other, and extending the fitting edge 110 over the entire circumference. It was brazed. A plurality of holes 111 are provided in a lower portion of the main body 105, and a substantially cylindrical injector cup 106 is attached to these holes 111. The injector cup 106 is connected to a fuel injection nozzle (not shown). It is connected. Further, the conduit 108 is disposed along a side surface of the main body 105, and an end thereof communicates with the hollow portion 104 at an end 107 of the main body 105.

[0004]

However, the structure of the above-mentioned conventional delivery pipe 101 is such that
Since it is composed of a plurality of pressed parts, in order to assemble the pressed parts, the pressed parts must be fitted together and brazed over the entire periphery of the fitting edge 110. The work was troublesome and the production cost was high.
Also, as can be seen from FIGS. 8 and 9, the fitting edge 110
The wax 112 flows out of the gap 1 between the two pressed parts.
As a result, the amount of wax consumed increased and wasteful costs were incurred.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a delivery pipe that can be easily assembled and manufactured at low cost.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned object, and has as its gist a conduit communicating with a fuel tank and a hollow portion connected to the conduit and having a hollow portion therein. A delivery pipe that includes a substantially cylindrical main body and an injector cup disposed at a lower portion of the main body, and a fuel pipe from which fuel from a fuel tank enters the main body through the conduit and passes through the injector cup. It is to provide an integrally formed delivery pipe.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a delivery pipe according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the vicinity of an internal combustion engine of a vehicle provided with the delivery pipe. A piston 3 reciprocating up and down in a cylinder bore 2 is provided in the cylinder block 1, and an upper portion of the cylinder bore 2 is closed by a cylinder head 4. A spark plug 5 is installed diagonally above the cylinder head 4 and an intake valve 6 is installed above the cylinder head 4.
The intake valve 6 is driven by a valve train provided in the cylinder head cover 7.

An intake manifold 8 is connected to the cylinder head 4 in a substantially horizontal direction. A fuel injection nozzle 9 and a delivery pipe 10 according to the present invention are connected to the intake manifold 8 in an inclined state. ing.
FIG. 2 is a front view of the delivery pipe 10 and FIG.
Shown in The main body 11 of the delivery pipe 10 is a cylindrical body, both ends of which are closed by caps 12, 12, and a substantially L-shaped conduit 14 having a circular cross section is connected to one end 13. ing. A substantially cylindrical injector cup 15 is provided below the main body 11. A mounting portion 16 is provided on the upper surface of the main body 11, and a pressure regulator (not shown) is mounted on the mounting portion 16.

Next, FIG. 4 is a longitudinal sectional view taken along line AA of FIG. 2, and FIG. 5 is a longitudinal sectional view taken along line BB of FIG.
, The structure of the delivery pipe 10 will be described in detail. As can be seen from FIG. 1, the delivery pipe 10 is normally attached to the vehicle body in an inclined state, so that the downward direction is indicated by an arrow in FIGS. 4 and 5 for easy understanding. The main body 11 of the delivery pipe 10 is a cylindrical body having a hollow portion and having a substantially L-shaped cross section, and is integrally formed by pressing a round pipe or the like. Simply pressing the round pipe will cause the inside 17 to be crushed due to the hollow part, so after deforming it to some extent, insert the core metal into the inside 17 and press further to make it into an approximately L-shaped cross section. Molding is preferred. Here, the main body 11 is substantially L
The reason why the shape is formed in a letter shape is to reduce the volume of air above the main body 11 in the vehicle mounted state, thereby reducing the amount of accumulated air. Then, when stopping and restarting the engine, the amount of accumulated air at the time of fuel supply is small, and
Since the air is discharged together with the fuel from the upper opening 18 of the injector cup 15, the engine starts well.

A first mounting hole 19 is provided on the upper surface of the main body 11, and a projection 20 of the mounting member 16 is fitted into the mounting hole 19, and thereafter, by a conventional means such as welding. The mounting member 16 is fixed to the main body 11. Further, the mounting member 16 has a flange 21 on an upper part, and a pressure regulator (not shown) is mounted on the flange 21. On the other hand, the lower surface 2 of the main body 11
2 is provided with a second mounting hole 23.
3, a substantially cylindrical injector cup 15 is attached. The injector cup 15 has an upper part fitted and fixed in the second mounting hole 23, and has an opening 24 having a large diameter formed in a lower part. The opening 24 communicates with the fuel injection nozzle 9. doing. The fuel enters the main body 11 of the delivery pipe 10 from the conduit 14 and
After passing through the injector cup 15, the fuel injection nozzle 9
To the internal combustion engine.

[0011]

As described above, according to the delivery pipe of the present invention, since the main body is integrally formed, there is no seam unlike the conventional delivery pipe, and there is no possibility that fuel leaks from the seam. . Further, since the shape is simple and there is no need to braze two pressed parts unlike the conventional delivery pipe, it is possible to reduce the number of assembly steps and the cost such as material cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the vicinity of an internal combustion engine of a vehicle provided with a delivery pipe according to the present invention.

FIG. 2 is a front view showing a delivery pipe according to the present invention.

FIG. 3 is a bottom view showing the delivery pipe according to the present invention.

FIG. 4 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 5 is an enlarged sectional view taken along line BB of FIG. 2;

FIG. 6 is a front view showing a conventional delivery pipe.

FIG. 7 is a bottom view showing a conventional delivery pipe.

FIG. 8 is an enlarged cross-sectional view taken along line CC of FIG. 6;

9 is an enlarged cross-sectional view taken along line DD of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder bore 3 Piston 4 Cylinder head 5 Spark plug 6 Intake valve 7 Cylinder head cover 8 Intake manifold 9 Fuel injection nozzle 10 Delivery pipe 11 Main part 12 Cap 13 End part 14 Duct 15 Injector cup 16 Mounting member 17 Inner 18 Upper opening 19 First mounting hole 20 Projection 21 Flange 22 Lower surface 23 Second mounting hole 24 Opening

Claims (1)

[Claims] A conduit connected to the fuel tank, a substantially cylindrical main body having a hollow portion therein, and an injector cup disposed at a lower portion of the main body;
In the delivery pipe in which fuel from the fuel tank enters the main body from the conduit and exits to the injector cup,
A delivery pipe, wherein the main body is integrally formed.