JP3378792B2 - Mounting structure between fuel inlet and fuel tank, and fuel tank - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a fuel inlet 101 as shown in FIG. 6 has been used to inject fuel such as gasoline into a fuel tank of an automobile or the like. The fuel inlet 101 is formed by connecting an inlet pipe 102 and a breather pipe 103 at their respective ends. The other ends of the inlet pipe 102 and the breather pipe 103 are connected to the fuel tank 1
It is inserted in 05 and used. Inlet pipe 10
The fuel refueled from the refueling port 121a provided at the one end 121 of the No. 2 is poured into the fuel tank 105 via the connecting pipe 122 and the other end 123 as shown by an arrow in the figure. At this time, the air in the fuel tank 105 is discharged from the one end 131 of the breather pipe 103 to the outside of the fuel tank 105 in order to suppress the pressure increase inside the fuel tank 105 due to the injection of fuel. The air discharged to the outside of the fuel tank 105 is connected to the connecting pipe 132 and the other end 13 of the breather pipe 103.
3, It is discharged to the atmosphere from the oil supply port 121a through one end 121 of the inlet pipe 102. Eventually, when the fuel in the fuel tank 105 accumulates to the height position of the one end 131 of the breather pipe 103, the fuel flows backward in the breather pipe 103 and flows into the one end 121 of the inlet pipe 102. The refueling person confirms this and stops refueling.

[0003]

However, in the above-mentioned conventional configuration, there is a problem that the inlet pipe 102 and the breather pipe 103 are branched into two, so that the space is taken, which is not preferable in terms of vehicle space. It was Further, since the one end 131 and the other end 133 of the breather pipe 103 are usually made of a metal pipe having a small diameter, they are apt to rust due to salt damage or the like, which causes the life of the fuel inlet to be shortened.

In view of the above problems, it is an object of the present invention to provide a mounting structure for a fuel inlet and a fuel tank, which does not take up space and is not affected by salt damage and the like, and its fuel tank.

[0005]

In order to solve the above-mentioned problems, the structure for mounting the fuel inlet and the fuel tank according to claim 1 of the present invention has a fuel filler pipe having a fuel filler port at one end, and a fuel filler. An inlet pipe configured to connect a fuel injection pipe into the fuel tank with a connecting pipe, an air vent pipe for discharging the air in the fuel tank to the outside of the fuel tank, and a fuel pipe discharged from the fuel tank. and a discharge pipe for discharging air to the atmosphere and a breather pipe, which is constructed by connecting at breather tube, a fuel inlet to the breather pipe Ru is constructed interpolated before Symbol inlet pipe, fixed to the fuel tank in the mounting structure, said injection pipe is fixed is in a state of penetrating at a predetermined mounting position of the side wall of the fuel tank The air vent pipe, said injection pipe is partially interpolation fixed infusion pipe and partly to form a double-pipe structure, upwardly from the end the injection pipe located inside of the fuel tank the Rukoto is formed so as to protrude, said injection pipe and said
The air vent pipe constitutes a part of the fuel tank in advance.
A predetermined length from the end of the connecting pipe of the inlet pipe
The part of the breather tube that extends is the fuel tank.
From the end of the air vent pipe protruding outside
While being inserted along the inner wall of the extraction pipe,
It is characterized in that the end portion is attached to the end portion of the injection pipe .

The so-called inner breather type fuel inlet, in which the breather pipe as described above is housed in the inlet pipe, has a smaller vehicle mounting space than the fuel inlet of the above-mentioned conventional structure which is branched into the breather pipe and the inlet pipe. It can be used effectively.
The above-mentioned mounting structure relates to a mounting structure of this inner breather type fuel inlet to the fuel tank.

According to the above-mentioned mounting structure, since the air vent pipe forming the end of the breather pipe is housed inside the injection pipe or inside the fuel tank, it does not come into direct contact with the outside air and suffers from salt damage and the like. Does not rust. Therefore, there is an advantage that the life of the fuel inlet is longer than that of the conventional structure. Further, since the double pipe structure is provided outside the fuel tank, it is possible to effectively use the vehicle space around the mounting structure.

In this concrete structure, as described in claim 2, the injection pipe and the air vent pipe form the double pipe structure that extends partially in the horizontal direction, and the double pipe structure is provided inside the fuel tank. It may be characterized in that each of the positioned end portions is formed so as to be vertically branched from each other.

In the above construction, specifically, a circular hole for penetrating the air vent pipe is previously formed in the upper wall surface of the bent portion of the injection pipe whose end portion is bent downward, and one end of the circular hole is provided. An air vent pipe bent upward is inserted from the other end, and joined at the position where each bent portion abuts. The part of the air vent pipe inserted into the injection pipe and the injection pipe form the double pipe structure.

The air vent pipe may have a function of discharging the air in the fuel tank to the outside and a function of controlling the liquid level in the fuel tank. That is, as described in claim 3, the upper end of the air bleeding pipe is arranged at a predetermined height position,
The liquid level of the fuel may be controlled by the position of the tip. That is, when the fuel is injected and reaches the upper end position of the air vent pipe, the fuel flows from the upper part of the air vent pipe and flows back to the fuel filler port through the breather tube. The refueling person confirms this at the refueling port and stops refueling. According to the above configuration, there is no need to separately provide a device for liquid level management or the like.

Further, as described in claim 4, the injection pipe and the air vent pipe are made of metal pipes having different pipe diameters, and the connecting pipe and the breather tube are made of a flexible resin material. It may be characterized by having been performed.

Since the air vent pipe manages the liquid level as described above, the tip position of the air vent pipe is required to be rigid enough not to be easily deformed by the external environment such as the outside temperature. Further, the injection pipe is required to have a rigidity enough to support the air vent pipe. In this respect, according to the above configuration, since the air vent pipe and the injection pipe are formed of the metal pipe, sufficient rigidity can be secured.

On the other hand, the connecting pipe and the breather tube are required to be able to change their arrangement shape flexibly, because the space between various instruments mounted between the fuel filler port and the fuel tank is interposed. However, according to the above configuration, since a resin material having good flexibility is used, this is possible.

Further, in the structure of the double tube structure,
As described in claim 5, the end of the air vent pipe located outside the fuel tank is disposed near the end of the injection pipe located outside the fuel tank. It may be one.

According to the above construction, since the end of the air vent pipe can be easily confirmed from the outside of the fuel tank, the breather tube can be inserted from the end. As a result, the workability is improved. Further, as for the method of fixing the injection pipe and the air vent pipe, as described in claim 5, the air vent pipe may be fixed to the injection pipe in a cantilever manner. Specifically, it is conceivable to fix the contact portion between the bent portion of the injection pipe and the bent portion of the air vent pipe by welding or the like. Since this welding can be performed from the outside with the injection pipe and the air vent pipe assembled, workability is good.

Further, the fuel inlet of the present invention is not supposed to be mounted in the fuel tank in a pre-assembled state, but is assumed to be assembled at the same time when the fuel inlet and the fuel tank are mounted. Fuel tank according to the present invention to realize such a configuration, as described in claim 7, claim 1-6
Fuel inlet and fuel tank according to any one of
The fuel tank in a mounting structure with
The pipe is previously fixed to the side wall of the fuel tank,
The air vent pipe is fixed to the injection pipe in advance .

That is, in the fuel tank described above, the injection pipe and the air vent pipe forming the fuel inlet are mounted in advance on the wall surface of the fuel tank. At the time of assembling the fuel inlet, a breather tube having a predetermined length extending from the end of the connecting pipe of the inlet pipe is mounted from the outside of the fuel tank.

[0018] More specifically, the injection pipe and the air vent pipe and forms a partially horizontally extending the double pipe structure, the upper and lower end of each located inside of the fuel tank from each other It may be characterized in that it is formed so as to branch into.

In the above construction, for example, a circular hole for allowing the air vent pipe to penetrate is provided in advance on the upper wall surface of the bent portion of the injection pipe bent downward at the end, and the air vent pipe bent upward at one end. Can be realized by inserting from the other end through the circular hole and joining at the positions where the respective bent portions abut. In this case, the portion of the air vent pipe that is inserted into the injection pipe forms the double pipe structure together with the injection pipe.

According to the above construction, since the air vent pipe is housed inside the injection pipe or inside the fuel tank, it does not come into direct contact with the outside air and is not damaged by salt. In addition, since the double pipe structure is provided outside the tank, it is possible to effectively use the vehicle space.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are explanatory views of a fuel inlet, a fuel tank, and a mounting structure of the fuel inlet and the fuel tank according to the present embodiment, and FIG.
2 is a perspective view showing an outline of the mounting structure, FIG. 2 is a view for explaining a mounting method of the fuel inlet corresponding to the view taken along the line AA in FIG. 1, and FIG. 3 is a view in the direction B in FIG. FIG. 4, FIG. 4 and FIG. 5 are partial sectional views of the fuel inlet.

As shown in FIG. 1, the fuel inlet 1 includes an inlet pipe 2 and the inlet pipe 2.
And a breather pipe 3 provided by being inserted thereinto. As is well known, the inlet pipe 2 has a function of supplying fuel to the fuel tank 5, and the breather pipe 3 has a function of discharging the air in the fuel tank 5 to the outside in order to prevent the pressure in the fuel tank 5 from rising. Have. That is, the fuel refueled from the refueling port is injected into the fuel tank 5 through the inside of the inlet pipe 2 as indicated by the arrow in the figure,
The air in the fuel tank 5 passes through the breather pipe 3 and is discharged to the atmosphere.

The inlet pipe 2 is provided with a fuel filler port 21.
A connecting pipe 2 having a refueling pipe 21 having a at one end and a refueling pipe 23 for injecting refueled fuel into the fuel tank 5.
It is configured by connecting at 2. The refueling pipe 21 is formed by expanding one end of a steel pipe as shown in the cross section in FIG. 5, and a cylindrical interferance 211 for mounting the lid of the refueling port is mounted on the inner surface of the end thereof. Has been done.
One end of the interferance 211 is opened to form a fuel supply port, and the other end is provided with a valve body 212 which is swingably supported. The valve body 212 is normally biased by a torsion spring or the like in a direction to close the interferance 211, and is pushed open by a fuel injection nozzle (shown by a chain double-dashed line) at the time of fuel supply. Further, a discharge pipe 33 provided at one end of a breather pipe 3 described later is inserted into the oil supply pipe 21, and a tip of the discharge pipe 33 is provided at a bottom portion of the interference 211. It is fitted and fixed to.

As shown in FIGS. 2 and 3, the injection pipe 23 is formed by bending a steel pipe of a predetermined length downward at its end or in the vicinity of its center, and the outer surface of the bent portion 23b will be described later. A through hole 23c for inserting the air vent pipe 31 is provided. The injection pipe 23 is fixed to the fuel tank 5 by welding after being inserted into a circular hole 51 provided at a predetermined position on the side surface of the fuel tank 5 up to the vicinity of the center. It should be noted that this welding also serves as a seal for the gap between the engaging portion between the injection pipe 23 and the fuel tank 5.

The connecting pipe 22 is a resin pipe having an inner diameter substantially equal to the outer diameter of the injection pipe 23, one end of which is connected to the end of the oil supply pipe 21 and the other end of which is the end 23d of the injection pipe 23. It is possible to connect to. In this way, since the connecting pipe 22 is made of a highly flexible resin, it can be arranged in a shape that matches the space inside the vehicle.

On the other hand, the breather pipe 3 is, as shown in FIG. 1, an air vent pipe 31 for discharging the air in the fuel tank 5 to the outside of the fuel tank 5, and an exhaust for discharging the air discharged from the fuel tank 5 to the atmosphere. It is configured by connecting the pipe 33 to the breather tube 32.

As shown in FIG. 2, the air vent pipe 31 is formed by bending one end of a thin thin steel pipe.
The air vent pipe 31 has the through hole 23 of the injection pipe 23.
After being inserted to the position of the bent portion 31b in c, the through hole 23
The entire circumference is welded along c and is fixed to the injection pipe 23. It should be noted that this welding also doubles as a function of sealing the gap between the engaging portions. As shown in FIG. 3, the air vent pipe 31 is fixed such that one end of the air vent pipe 31 projects upward from the through hole 23c of the injection pipe 23 by a predetermined length, and the liquid level in the fuel tank can be controlled by the position of the tip. Done. That is, when the fuel reaches a predetermined liquid level height F in the fuel tank, the fuel flows from the tip of the air vent pipe 31 located at this liquid level height F, and passes through the breather tube 32 to fill the fuel inlet. Backflow to the side. The fuel filler stops fueling after confirming that the backflowing fuel has flowed out from the discharge pipe 33.

The discharge pipe 33 is formed by molding a thin steel pipe, and as shown in FIGS. 1 and 5, the oil supply pipe 2
1 is interpolated. The tip of the discharge pipe 33 is fitted and fixed to the bottom plug body 213 of the interferance 211, and the openings 33a, 3 are formed on the side surface of the end portion of the discharge pipe 33.
3b is provided, and air is discharged from this opening. When fuel is refueled from the refueling pipe 21 in FIG. 5, the valve body 212 is pushed open to form a shielding wall as shown by the dotted line, so that the fuel does not flow into the discharge pipe 33. .

The breather tube 32 is composed of a rubber tube having an outer diameter smaller than the inner diameter of the air vent pipe 31. As shown in FIGS. 1 and 3, the breather tube 32
One end is inserted into and connected to the air vent pipe 31, and the other end is connected to the end of the exhaust pipe 33. As shown in the detailed cross-section of the C portion in FIG. 3 in FIG. 4, the one end of the breather tube 32 is inserted to the vicinity of the tip of the air vent pipe 31. In this case, since a slight gap is formed between the breather tube 32 and the air vent pipe 31, when the fuel having reached a predetermined liquid level flows backward, this fuel may flow through the gap. Although conceivable, since this fuel flows out from the end portion 31a of the air bleeding pipe 31 into the connecting pipe 22 and is returned to the fuel tank 5 again, there is no problem.

In the fuel inlet 1 of this embodiment, since the breather pipe 3 is inserted in the inlet pipe 2, the air vent pipe 31 and the exhaust pipe 33 are rusted due to salt damage as in the conventional case. There is no. Next, a method of attaching the fuel inlet 1 and the fuel tank 5 will be described with reference to FIG.

The fuel inlet 1 of this embodiment is not assembled to the fuel tank 5 in a pre-assembled state, but is assembled at the same time when the fuel inlet 1 and the fuel tank 5 are attached. That is, the injection pipe 23 and the air vent pipe 31 that form the fuel inlet 1 are fixed to the wall surface of the fuel tank 5 in advance and form a part of the fuel tank 5. On the other hand, a semi-finished product of the fuel inlet 1 in which the breather tube 32 extends for a predetermined length from the end 22b of the connecting pipe 22 of the inlet pipe 2 is mounted. That is, the extended portion of the breather tube 32 is inserted along the inner wall of the air vent pipe 31 from the end portion 31a of the air vent pipe 31 protruding outside the fuel tank 5, and at the same time as the insertion is completed, the end portion of the connecting pipe 22 is inserted. By mounting 22b on the end portion 23d of the injection pipe 23, the assembly of the fuel inlet is completed.

As described above, in the mounting structure of the fuel inlet 1 and the fuel tank 5 of this embodiment, a semi-finished product of the fuel inlet 1 is installed in the fuel tank 5 in which the air vent pipe 31 and the injection pipe 23 are previously fixed to the side wall. It is completed by a simple mounting work that is mounted from the outside. Further, the end portion 31a of the air vent pipe 31 into which the breather tube 32 is inserted can be easily confirmed from the outside, and
The inserted breather tube 32 is used for the air vent pipe 3
Since the inner surface of 1 can be smoothly inserted as a guide, the assembly is easy and quick.

Although the present embodiment has been described above, it goes without saying that the embodiment of the present invention is not limited to the above embodiment and can take various forms within the technical scope of the present invention. Nor. For example, the air vent pipe 3
1 and the injection pipe 23 were joined by welding all around the joint, but if sufficient strength is guaranteed,
Partial welding may be performed by spot welding or the like. In this case, the fuel may flow from the gap formed at the joint, but this fuel is inevitably returned into the fuel tank 5, so there is no problem.

Further, in the above embodiment, the relationship between the lengths of the oil supply pipe 21 and the connecting pipe 22 forming the inlet pipe 2 and the lengths of the breather tube 32 and the discharge pipe 33 forming the breather pipe 3 are determined. It is needless to say that the relationship is not limited to the mode shown in FIG. 1 and can be appropriately changed in consideration of the material cost and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a mounting structure for a fuel inlet and a fuel tank according to an embodiment of the present invention.

FIG. 2 is a view for explaining a mounting method of a fuel inlet corresponding to the case of being viewed from the AA cross section in FIG.

FIG. 3 is a view in the direction of arrow B in FIG.

FIG. 4 is a partial cross-sectional view showing details of a C portion in FIG.

FIG. 5 is a partial cross-sectional view of an oil supply pipe according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... Fuel inlet, 2 ... Inlet pipe, 3 ... Breather pipe, 5 ... Fuel tank, 21 ... Refueling pipe, 21a ... Refueling port, 2
2 ... Connection pipe, 23 ... Injection pipe, 23c ...
・ Through hole, 31 ... Air vent pipe, 32 ... Breather tube, 33 ... Discharge pipe, F ... Liquid level

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60K 15/01 B60K 15/063

Claims (7)

(57) [Claims] 1. An inlet pipe constituted by connecting a refueling pipe having a fuel refueling port at one end and a refueling pipe for injecting refueled fuel into a fuel tank by a connecting pipe, and air in the fuel tank. a vent pipe to discharge to the outside of the fuel tank, the air discharged from the fuel tank and a breather pipe, which is configured by connecting a discharge pipe for discharging to the atmosphere at breather tube, the breather pipe before Symbol inlet the fuel inlet is inserted into Ru is configured to a pipe, the mounting structure for mounting to the fuel tank, said injection pipe is fixed in a state of penetrating at a predetermined mounting position of the side wall of the fuel tank, the air vent The pipe is partially inserted and fixed to the injection pipe to partially form a double pipe structure with the injection pipe.
To, by Rukoto formed so that the end portion located inside the fuel tank protrudes upward from said injection pipe,
The injection pipe and the air vent pipe are
A part of the fuel tank and extends a predetermined length from the end of the inlet pipe connecting pipe
The portion of the breather tube that has been
From the end of the air vent pipe protruding to the
While being inserted along the inner wall of the pipe, the end of the connecting pipe
Is attached to an end portion of the injection pipe, and a mounting structure for a fuel inlet and a fuel tank. 2. The injection pipe and the air bleeding pipe form the double pipe structure that extends partially in a horizontal direction, and the ends of the fuel pipe inside the fuel tank branch up and down. The mounting structure for a fuel inlet and a fuel tank according to claim 1, wherein the mounting structure is for a fuel tank. 3. The upper surface of the air bleeding pipe is arranged at a predetermined height position, and the liquid surface level of the fuel is controlled by the position of the upper end. Mounting structure for fuel inlet and fuel tank. 4. The injection pipe and the air vent pipe are made of metal pipes having different diameters, and the connecting pipe and the breather tube are made of a resin material having good flexibility. Item 4. An attachment structure for the fuel inlet according to any one of items 1 to 3 and the fuel tank. 5. The end of the air vent pipe located outside the fuel tank is located near the end of the injection pipe located outside the fuel tank. 4. The structure for mounting the fuel inlet according to any one of 4 and the fuel tank. 6. The mounting structure for a fuel inlet and a fuel tank according to claim 1, wherein the air vent pipe is fixed to the inlet pipe in a cantilevered manner. 7. The fuse according to any one of claims 1 to 6.
The fuel in the mounting structure of the L inlet and the fuel tank
Fuel tank, in which the injection pipe is previously fixed to the side wall of the fuel tank.
And the air vent pipe is previously fixed to the injection pipe.
A fuel tank characterized by: