JPH09150637A - Fuel inlet and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel inlet having a sealing property and strength and requiring less manufacturing cost and its manufacturing method. SOLUTION: A fuel inlet 1 is constituted of an inlet pipe 2, an injection part 4 and a breather tube 10. The inlet pipe 2 is a cylindrical pipe to introduce fuel to a fuel tank which is not shown in a drawing and it is furnished with a flat part 2a for installation to install the breather tube 10 and a flat part 2b for support to make it easy to support this breather tube 10 at the time of projection welding of it. Additionally, a hole 2c communicated to the breather tube 10 is provided on the flat part 2a for installation. The injection part 4 is formed by extending a head end of the inlet pipe 2 in diameter. The breather tube 10 has a flange 10a provided on an opening on its head end side, and this flange 10a is projection welded on the flat part 2a for installation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel inlet for injecting fuel such as gasoline into a fuel tank of an automobile or the like and a method for manufacturing the fuel inlet.

[0002]

2. Description of the Related Art Conventionally, as a fuel inlet for injecting fuel such as gasoline into a fuel tank of an automobile or the like, for example, as shown in FIG. 4, an inlet pipe 102 for guiding the fuel to the fuel tank, and this inlet pipe 10 are shown.
Injecting part 104 having a spiral groove 104b formed by expanding the diameter of the tip of the nozzle 2 for screwing the cap, and for removing air from the fuel tank when injecting fuel by opening the inlet pipe 102 on the tip side. A fuel inlet with a breather tube 110 of

The breather tube 110 of such a fuel inlet has the necked opening 110a inserted into the inlet pipe 102, and the opening 1
It was fixed by brazing the periphery of 10a.

[0004]

However, in the above fuel inlet, when the breather tube 110 is brazed, the hole of the inlet pipe 102 is passed through the necked opening 110a through the ring formed of the low melting point metal. However, there is a problem that the manufacturing cost increases because the brazing is carried out by inserting it into a high temperature furnace.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel inlet having a sealing property and strength equivalent to those of the conventional ones, which does not increase the manufacturing cost, and a manufacturing method thereof.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is to provide an inlet pipe for guiding fuel to a fuel tank, and from the fuel tank to the inlet when fuel is injected. In a fuel inlet provided with a breather tube for bleeding air on the tip side of the pipe, a flange is provided at the open end of the breather tube connected to the tip side of the inlet pipe, and the flange is the tip of the inlet pipe. It is characterized in that it is projection-welded around the hole provided on the side.

According to such a fuel inlet, since the flange provided on the breather tube is projection-welded around the entire circumference of the inlet pipe hole, the sealing property and strength of the welded portion are equivalent to those of conventional brazing. is there. Further, in the conventional brazing, it was necessary to use a high temperature furnace, so that the manufacturing cost was high. However, the fuel inlet of the present invention does not require a high temperature furnace, so that the manufacturing cost can be kept low.

The invention according to claim 2 is the fuel inlet according to claim 1, characterized in that the periphery of the hole provided in the inlet pipe is flattened. According to such a fuel inlet, since the flange of the breather tube is projection welded to the flat portion of the inlet pipe, it is possible to obtain an effect that the welding work can be easily performed as compared with the case of welding the peripheral surface (curved surface) of the inlet pipe. To be

A third aspect of the present invention is a method for manufacturing the fuel inlet according to the first or second aspect, wherein one electrode is arranged inside the tip end side of the inlet pipe and the other electrode is opened in the breather tube. It is externally inserted into the tapered pipe expanding portion provided at the end, and in the state where both electrodes are opposed to each other, pressure is applied in a direction in which both electrodes approach each other and a current is applied to both electrodes, so that the pipe expanding portion is expanded to form a flange The fuel inlet according to claim 1 or 2 is manufactured by performing projection welding around a hole provided on the front end side of the pipe.

In such a manufacturing method, a tapered expanded portion is provided at the open end of the breather tube. Since this pipe expanding portion has a tapered shape, it forms a predetermined pipe expanding angle (for example, 30 to 60 °) with respect to the opening end of the breather tube. However, the work of forming such a pipe expanding portion is performed by the opening end of the breather tube. This is easier than forming a flange on the. That is, if a flange is provided at the open end of the breather tube, the flange forms an angle of about 90 ° with respect to the open end of the breather tube, so that the elongation rate of the open end becomes large, and the processing at the time of forming the flange is increased. The work becomes complicated. On the other hand, in the work of forming the expanded portion, the elongation at the open end does not become as large as that of the flange, so that the working work is easier than in the case of forming the flange. When performing projection welding, resistance heat is generated at the same time as pressure is applied. Therefore, the tapered pipe expansion portion can be easily expanded at the same time as projection welding to form a flange.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment of the present invention
It is needless to say that the present invention is not limited to the following embodiments, and can take various forms within the technical scope of the present invention. [Embodiment] FIG. 1 is a sectional view of a fuel inlet of an embodiment.

The fuel inlet 1 of this embodiment comprises an inlet pipe 2, an injection portion 4 and a breather tube 1.
0. The inlet pipe 2 is a cylindrical pipe for guiding fuel to a fuel tank (hereinafter referred to as “tank”), and supports a flat portion 2a for mounting the breather tube 10 and a support when the breather tube 10 is projection welded. A supporting flat portion 2b is provided for facilitating. Further, the mounting flat portion 2a is provided with a hole 2c communicating with the breather tube 10. The injection part 4 is formed by expanding the diameter of the tip of the inlet pipe 2, and is provided with a spiral groove 4b for screwing with a cap (not shown). The breather tube 10 is provided with a flange 10a at the open end 10c.
0a is projection welded to the mounting flat portion 2a of the inlet pipe 2.

If such a fuel inlet 1 is attached to a tank of an automobile, when the injection nozzle (not shown) is inserted from the injection port 4a of the injection portion 4 and gasoline is injected, the air in the tank is discharged through the breather tube 10. Therefore, gasoline can be supplied smoothly,
In addition, it is possible to prevent bubbles from being mixed with gasoline in the tank.

Next, a method for manufacturing the fuel inlet 1 will be described with reference to FIGS. FIG. 2 is a sectional view showing a manufacturing process of the fuel inlet, and FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2. An inlet pipe 2 provided with a mounting flat portion 2a, a supporting flat portion 2b and a hole 2c,
A tapered pipe expanding portion 10b (a pipe expanding angle θ =
Breather tube 10 (Figs. 2 and 3) provided with 45 °)
In the figure, a two-dot chain line is shown), a substantially rectangular electrode 6, a ring-shaped electrode 7, and a support base 8 are prepared. Incidentally, one of the electrodes 6 and 7 is +, and the other is −.

First, a substantially rectangular electrode 6 is inserted from the inlet portion 4 side of the inlet pipe 2. At this time, the electrode 6 is arranged so as to contact the entire inner surface of the mounting flat portion 2a. Further, the supporting flat portion 2b of the inlet pipe 2 is brought into contact with the support base 8 to prevent the inlet pipe 2 from rolling over (axial rotation). Further, the ring-shaped electrode 7 is externally inserted into the expanded tube portion 10b of the breather tube 10. The inner diameter of the electrode 7 is substantially the same as the outer diameter of the breather tube 10.

Then, in this state, the ring-shaped electrode 7 and the electrode 6 in the inlet pipe 2 are opposed to each other, and the electrode 7 is moved downward (shown by an outlined arrow in FIGS. 2 and 3) to move the breather. The open end of the expanded portion 10b of the tube 10 is brought into contact with the mounting flat portion 2a of the inlet pipe 2. Then, the ring-shaped electrode 7 is pressed toward the electrode 6 and a current is passed through both electrodes 6, 7. Then, the end portion of the tube expanding portion 10b is welded to the mounting flat portion 2a by resistance heat, and the tube expanding portion 10b is gradually spread by the pressurization.
The expanded portion is further welded. In this way, the expanded portion 10b finally becomes the flange 10a, and the entire circumference of the flange 10a is welded to the mounting flat portion 2a.

According to this manufacturing method, the following effects can be obtained. That is, since it is not necessary to use a high temperature furnace as in the conventional case, the manufacturing cost can be kept low. The work of forming the tapered pipe expanding portion 10b (tube expanding angle θ = 45 °) at the opening end 10c of the breather tube 10 is as follows.
A flange 10a is provided on the open end 10c of the breather tube 10.
It is easy because the elongation rate may be smaller than that in the case of forming. When projection welding is performed, resistance heat is generated at the same time as pressure is applied, so that the tapered tube-shaped expanded portion 10b can be easily expanded at the same time as projection welding to form the flange 10a. Since the periphery of the hole 2c is a flat surface, the welding operation can be performed more easily than when projection welding is performed on a curved surface such as a cylindrical surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fuel inlet of this embodiment.

FIG. 2 is a cross-sectional view showing a manufacturing process of a fuel inlet of this embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of a conventional fuel inlet.

[Explanation of symbols]

1 ... Fuel inlet, 2 ... Inlet pipe, 2a ... Flat portion for mounting,
2b ... Supporting flat portion, 2c ... Hole,
4 ... injection part, 4a ... injection port, 4b ... spiral groove, 6, 7
... Electrodes, 8 ... Supports,
10 ... Breather tube, 10a ...
・ Flange, 10b ...
10c ... open end,

Claims (3)

[Claims] 1. A fuel inlet comprising: an inlet pipe for guiding fuel to a fuel tank; and a breather tube for bleeding air from the fuel tank to a tip side of the inlet pipe when injecting fuel. A fuel inlet, wherein a flange is provided at an opening end connected to a tip side of the inlet pipe, and the flange is projection-welded around a hole provided at a tip side of the inlet pipe. 2. The fuel inlet according to claim 1, wherein the hole provided in the inlet pipe is flattened around the hole. 3. One electrode is disposed inside the tip end side of the inlet pipe, the other electrode is externally inserted into a tapered expansion part provided at the open end of the breather tube, and both electrodes are opposed to each other. 3. The fuel according to claim 1 or 2, wherein pressure is applied in a direction in which the pressure is approached and a current is applied to both electrodes to spread and expand the expanded tube portion to form a flange and perform projection welding around a hole provided on the front end side of the inlet pipe. A method for manufacturing a fuel inlet, which comprises manufacturing an inlet.