JP6874970B2 - Fuel refueling pipe - Google Patents

Description

The present invention relates to a fuel refueling pipe that serves as a passage for refueling a fuel tank of an automobile or the like.

Conventionally, for example, the fuel refueling pipe disclosed in Patent Document 1 has a first cylinder having a refueling port at one end, one end connected to the other end of the first cylinder, and the other end being a fuel tank. It has a second cylinder connected to. The first cylinder has a two-layer structure, and is composed of an inner layer made of nylon to which carbon black is added and an outer layer made of polyethylene. On the other hand, the second cylinder also has a two-layer structure, and is composed of an inner layer made of polyethylene and an outer layer made of polyethylene to which carbon black is added. Then, on the outer peripheral surface of the other end of the first cylinder, a plurality of annular ridges having a triangular cross section protruding outward in the radial direction of the first cylinder are formed at predetermined intervals along the center line of the cylinder. , The other end side of the first cylinder body is press-fitted into one end side of the second cylinder body, and each annular ridge portion is brought into contact with the inner peripheral surface of the second cylinder body, whereby the first cylinder body and the second cylinder body are formed. Are united.

Japanese Unexamined Patent Publication No. 2015-157494

By the way, the polyethylene used for forming the inner and outer layers of the second cylinder in Patent Document 1 has a higher coefficient of thermal expansion than the nylon used for forming the inner layer of the first cylinder located inside the second cylinder. It is large and has high swellability to fuel oil and the like (liquid fuel oil such as gasoline, light oil, alcohol mixed fuel and biodiesel fuel). Therefore, for example, the sealing property between the first cylinder and the second cylinder may be deteriorated due to thermal expansion or swelling due to changes in the environment during use or long-term use, and thus the second cylinder. There is a problem that an additional member or structure for bringing the body into close contact with the first cylinder is required, which increases the cost.

The present invention has been made in view of such a point, and an object of the present invention is to provide a low-cost fuel refueling pipe capable of maintaining a high sealing property of a connecting portion between two cylinders.

In order to achieve the above object, the present invention is characterized in that the method of stacking the connecting portions of the first and second cylinders is devised.

Specifically, it includes a first cylinder having a fuel filler port at one end and a second cylinder having one end connected to the other end of the first cylinder and the other end connected to a fuel tank. The following solutions were taken for the fuel filler pipe that guides the fuel poured from the fuel filler port to the fuel tank.

That is, in the first invention, the first cylinder is designed so that the thermal expansion coefficient is lower than that of the second cylinder, or the swellability is designed to be lower. In the second cylinder, one end side of the second cylinder is placed inside the other end side of the first cylinder so that the other end side of the first cylinder and one end side of the second cylinder overlap each other. It is integrated by press-fitting or fitting, and a metal reinforcing cylinder whose center line coincides with the center line of the second cylinder is located inward on one end side of the second cylinder. 2 It is characterized in that it is attached so as to be in close contact with the inner peripheral surface of the cylinder.

In the second invention, in the first invention, the first cylinder is made of a metal material, and the second cylinder is made of a resin material .

A third aspect of the invention is characterized in that, in the first invention, a folded-back portion is formed at one end of the reinforcing cylinder so as to cover one end of the second cylinder.

In the fourth invention, a first cylinder having a fuel filler port at one end and a second cylinder having one end connected to the other end of the first cylinder and the other end connected to the fuel tank are provided. , A fuel refueling pipe that guides the fuel poured from the refueling port to the fuel tank, and the first cylinder is designed so that the thermal expansion coefficient is lower than that of the second cylinder, or The first and second cylinders are designed so that the swelling property is low, and the other end side of the first cylinder and one end side of the second cylinder overlap each other. It is integrated by press-fitting or fitting one end side of the second cylinder to the inside of the other end side, and the cylinder center line of the second cylinder is formed on the outer peripheral surface of the second cylinder on one end side. A first annular groove and a second annular groove extending around the surface are formed side by side in order from one end side of the second cylinder, and the first annular groove is formed of a fuel-resistant oil-resistant rubber. While the annular sealing material is fitted, the second annular sealing material made of weather-resistant rubber is fitted into the second annular concave groove, and one end side of the second tubular body is fitted to the other end side of the first tubular body. It is characterized in that the outer peripheral portions of the first and second annular sealing materials are in contact with the inner peripheral surface of the first cylinder body in a state of being press-fitted or fitted.

In the fifth invention, a first cylinder having a fuel filler port at one end and a second cylinder having one end connected to the other end of the first cylinder and the other end connected to the fuel tank are provided. , A fuel refueling pipe that guides the fuel poured from the refueling port to the fuel tank, and the first cylinder is designed so that the thermal expansion coefficient is lower than that of the second cylinder, or The first and second cylinders are designed so that the swelling property is low, and the other end side of the first cylinder and one end side of the second cylinder overlap each other. It is integrated by press-fitting or fitting one end side of the second cylinder to the inside of the other end side, and corresponds to the other end portion of the first cylinder on the outer peripheral surface on one end side of the second cylinder. A plurality of recesses are formed at the positions to be formed, and by deforming the portions of the first cylinder corresponding to the recesses and allowing them to enter the recesses, the first cylinder is formed in the second cylinder. It is characterized by being fixed.

In the first invention, at the connecting portion of the first and second cylinders, the first cylinder having a smaller coefficient of thermal expansion than the second cylinder or having a lower swelling property is located outside the second cylinder. Therefore, even if thermal expansion or swelling occurs during use, the second cylinder will be deformed to the side where the second cylinder is in close contact with the first cylinder, and the sealing property of the connecting portion in the first and second cylinders will be improved. Can be enhanced. Further, since no additional member or structure is required to bring the second cylinder into close contact with the first cylinder, the fuel refueling pipe can be made at a low cost.

Further, when the second cylinder is deformed due to thermal expansion or swelling, the reinforcing cylinder prevents the second cylinder from being deformed inward in the radial direction. Therefore, it is possible to surely prevent the deformation of the second cylinder body from being separated from the first cylinder body, and the connecting portion of the first and second cylinder bodies has a structure having a high sealing property.

In the second invention, since a part of the fuel refueling pipe is made of a resin material having a specific gravity smaller than that of the metal material, the weight of the entire fuel refueling pipe can be reduced .

In the third invention, since the end portion of the reinforcing cylinder has a U-shaped cross section, the rigidity of the reinforcing cylinder is increased. Therefore, it is possible to prevent the reinforcing cylinder from being deformed, and the second cylinder can be reliably brought into close contact with the first cylinder.

In the fourth invention, since the first annular sealing material made of fuel-resistant rubber is located between the first cylinder and the second cylinder on the refueling passage side of the fuel refueling pipe, the fuel refueling pipe is provided for a long period of time. Even if it is used, the first annular sealing material is less likely to be deteriorated by the fuel passing through the refueling passage. On the other hand, since the second annular seal material made of weather-resistant rubber is located on the outer peripheral surface side of the fuel oil supply pipe, the second annular seal material is less likely to deteriorate even if the fuel oil supply pipe is used for a long period of time. As described above, even if the fuel refueling pipe is used for a long period of time, the deterioration of the sealing property at the connecting portion of the first and second cylinders can be surely prevented by the first and second annular sealing materials.

In the fifth invention, the first and second cylinders can be firmly fixed to each other, and the first cylinder is further brought into close contact with the second cylinder due to the deformation of the first cylinder toward the second cylinder. .. Therefore, the sealing property between the first and second cylinders can be further improved with a simple fixing structure.

It is a perspective view of the fuel refueling pipe which concerns on embodiment of this invention, and the fuel tank which connects the fuel refueling pipe. FIG. 5 is a cross-sectional view taken along the line II-II of FIG. It is an enlarged view of Part III of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is essentially merely an example.

FIG. 1 shows a fuel refueling pipe 1 according to an embodiment of the present invention. The fuel refueling pipe 1 guides the fuel poured from the refueling port 2a to the fuel tank 10 of the vehicle, and has a first cylinder 2 having the refueling port 2a at one end and the first cylinder at one end. A second cylinder 3 connected to the other end of 2 and the other end connected to the fuel tank 10 is provided, and the fuel filler port 2a is swiveled by a fuel filler cap 9.

The first cylinder 2 is made of stainless steel, while the second cylinder 3 is made of high-density polyethylene. That is, the first cylinder 2 is made of a metal material, while the second cylinder 3 is made of a resin material, and the first cylinder 2 has a smaller coefficient of thermal expansion than the second cylinder 3. Moreover, it is designed to have low swelling property.

As shown in FIG. 2, the first tubular body 2 has a shape in which one end side is wider than the other portion, and a short tubular stainless steel retainer 2b is arranged inside the one end side. Has been done.

Further, the other end side of the first tubular body 2 projects radially outward from the middle portion of the first tubular body 2, and an annular step portion is provided between the overhanging portion and the non-overhanging portion. 2c is formed.

On the other hand, as shown in FIGS. 2 and 3, an annular ridge portion 3a extending along the peripheral edge of the opening is provided at one end of the second tubular body 3.

Further, on the outer peripheral surface on one end side of the second tubular body 3, a first annular concave groove 3b and a second annular concave groove 3c extending around the cylinder center line of the second tubular body 3 are formed on the second tubular body 3. They are formed side by side in order from one end side.

Further, a plurality of recesses 3d are provided at equal intervals around the center line of the cylinder on the outer peripheral surface of the second cylinder 3 on the other end side of the second annular concave groove 3c.

The first annular sealing material 4 made of fuel oil resistant rubber is fitted into the first annular concave groove 3b, while the second annular sealing material 5 made of weather resistant rubber is fitted into the second annular concave groove 3c. It has been.

On the inside of the second cylinder 3 on one end side, a short substantially tubular stainless steel reinforcing cylinder 6 whose center line coincides with the center line of the second cylinder 3 is the inner peripheral surface of the second cylinder 3. At one end of the reinforcing tubular body 6, a folded-back portion 6a formed by folding outward in a U-shaped cross section so as to cover the annular ridge portion 3a is formed.

Then, the first cylinder 2 and the second cylinder 3 have the other end side of the first cylinder 2 and the first cylinder 2 in a state where the reinforcing cylinder 6 is attached to one end side of the second cylinder 3. The one end side of the second cylinder 3 is press-fitted or fitted to the other end side of the first cylinder 2 so as to overlap the one end side.

Further, the outer peripheral portions of the first annular sealing material 4 and the second annular sealing material 5 are the first tubular body in a state where one end side of the second tubular body 3 is press-fitted or fitted to the other end side of the first tubular body 2. It comes into contact with the inner peripheral surface of 2.

Further, when the one end side of the second cylinder 3 is press-fitted or fitted to the other end side of the first cylinder 2, the folded portion 6a of the reinforcing cylinder 6 comes into contact with the annular step portion 2c, so that the second cylinder The other end portion of the first tubular body 2 corresponds to the position of each concave portion 3d of the body 3, and the portion corresponding to each concave portion 3d of the first tubular body 2 is deformed inward in the radial direction to form a deformed portion. The first cylinder 2 is fixed to the second cylinder 3 by forming the 2d and allowing the deformed portion 2d to enter each recess 3d.

From the above, according to the embodiment of the present invention, at the connecting portion of the first cylinder 2 and the second cylinder 3, the first cylinder has a smaller coefficient of thermal expansion and lower swellability than the second cylinder 3. Since 2 is located outside the 2nd cylinder 3, even if thermal expansion or swelling occurs during use, the 2nd cylinder 3 will be deformed to the side where the 2nd cylinder 3 is in close contact with the 1st cylinder 2. It is possible to improve the sealing property of the connecting portion in the 1-cylinder body 2 and the 2nd cylinder body 3.

Further, since no additional member or structure for bringing the second cylinder 3 into close contact with the first cylinder 2 is required, the fuel refueling pipe 1 can be made at a low cost.

Further, since a part of the fuel refueling pipe 1 is made of a resin material having a specific gravity smaller than that of the metal material, the weight of the entire fuel refueling pipe 1 can be reduced.

Further, when the second cylinder 3 is deformed due to thermal expansion or swelling, the reinforcing cylinder 6 prevents the second cylinder 3 from being deformed inward in the radial direction. Therefore, it is possible to reliably prevent the second cylinder 3 from being deformed away from the first cylinder 2, and the connecting portion between the first cylinder 2 and the second cylinder 3 has a structure having a high sealing property.

Further, since the end portion of the reinforcing cylinder 6 has a U-shaped cross section, the rigidity of the reinforcing cylinder 6 is increased. Therefore, it is possible to prevent the reinforcing cylinder 6 from being deformed, and the second cylinder 3 can be surely brought into close contact with the first cylinder 2.

Further, since the first annular sealing material 4 made of fuel oil resistant rubber is located between the first cylinder 2 and the second cylinder 3 on the refueling passage side of the fuel refueling pipe 1, the fuel refueling pipe 1 is lengthened. Even if it is used for a period of time, the quality of the first annular sealing material 4 is less likely to be deteriorated by the fuel passing through the refueling passage. On the other hand, since the second annular seal material 5 made of weather-resistant rubber is located on the outer peripheral surface side of the fuel oil supply pipe 1, the second annular seal material 5 is less likely to deteriorate even if the fuel oil supply pipe 1 is used for a long period of time. As described above, even if the fuel oil supply pipe 1 is used for a long period of time, the first annular sealing material 4 and the second annular sealing material 5 reduce the sealing property at the connecting portion of the first tubular body 2 and the second tubular body 3. Can be reliably prevented.

Further, since the first cylinder 2 is fixed to the second cylinder 3 by deforming the other end of the first cylinder 2 and fitting it into each recess 3d of the second cylinder 3, the first cylinder 2 is fixed. 2 and the second cylinder 3 can be firmly fixed to each other, and the first cylinder 2 is further brought into close contact with the second cylinder 3 due to the deformation of the first cylinder 2 toward the second cylinder 3. Therefore, the sealing property between the first cylinder 2 and the second cylinder 3 can be further improved with a simple fixing structure.

In the embodiment of the present invention, the first cylinder 2 is made of stainless steel, while the second cylinder 3 is made of high-density polyethylene, but the present invention is not limited to this, for example, the first cylinder 2. The second cylinder 3 may be formed of high-density polyethylene, or the first cylinder 2 may be formed of nylon while the second cylinder 3 may be formed of high-density polyethylene. Good. That is, the first cylinder 2 may be designed to have a lower coefficient of thermal expansion than the second cylinder 3, or the first cylinder 2 may be designed to have a lower swellability.

Further, in the embodiment of the present invention, the second cylinder 3 is formed of high-density polyethylene, but the present invention is not limited to this, and the second cylinder 3 may be formed of a resin such as polycarbonate, polypropylene, or polystyrene. In particular, when the second cylinder 3 is formed into a single layer or multiple layers using nylon (polyamide synthetic resin), EVOH (ethylene / vinyl alcohol copolymer resin) and fluororesin, the fuel permeability is excellent. It can be made into a fuel filler pipe 1.

The present invention is suitable for a fuel refueling pipe that serves as a passage for refueling a fuel tank of a vehicle.

1 Fuel refueling pipe 2 1st cylinder 2a Refueling port 3 2nd cylinder 3b 1st annular concave groove 3c 2nd annular concave groove 4 1st annular sealing material 5 2nd annular sealing material 6 Reinforcing cylinder 6a Folded part 10 Fuel tank

Claims (5)

The first cylinder with a fuel filler at one end,
A second cylinder having one end connected to the other end of the first cylinder and the other end connected to the fuel tank is provided.
A fuel refueling pipe that guides the fuel poured from the refueling port to the fuel tank.
The first cylinder is designed to have a lower coefficient of thermal expansion than the second cylinder, or is designed to have lower swellability.
The first and second cylinders have the second cylinder inside the other end side of the first cylinder so that the other end side of the first cylinder and one end side of the second cylinder overlap each other. and integral by press fitting or fitting the one end of,
A metal reinforcing cylinder whose center line coincides with the center line of the second cylinder is attached to the inside of one end of the second cylinder so as to be in close contact with the inner peripheral surface of the second cylinder. A fuel refueling pipe characterized by being installed. In the fuel refueling pipe according to claim 1,
The first cylinder is made of a metal material and is made of a metal material.
The second cylinder is a fuel refueling pipe characterized in that it is made of a resin material. In the fuel refueling pipe according to claim 1,
A fuel refueling pipe characterized in that a folded portion is formed at one end of the reinforcing cylinder so as to cover one end of the second cylinder. The first cylinder with a fuel filler at one end,
A second cylinder having one end connected to the other end of the first cylinder and the other end connected to the fuel tank is provided.
A fuel refueling pipe that guides the fuel poured from the refueling port to the fuel tank.
The first cylinder is designed to have a lower coefficient of thermal expansion than the second cylinder, or is designed to have lower swellability.
The first and second cylinders have the second cylinder inside the other end side of the first cylinder so that the other end side of the first cylinder and one end side of the second cylinder overlap each other. It is integrated by press-fitting or fitting one end side of
On the outer peripheral surface of the second cylinder on one end side, a first annular concave groove and a second annular concave groove extending around the cylinder center line of the second cylinder are arranged in order from one end side of the second cylinder. Formed by
A first annular sealing material made of fuel oil resistant rubber is fitted into the first annular concave groove, while a second annular sealing material made of weather resistant rubber is fitted into the second annular concave groove.
With one end side of the second cylinder press-fitted or fitted to the other end side of the first cylinder, the outer peripheral portions of the first and second annular sealing materials are on the inner peripheral surface of the first cylinder. A fuel refueling pipe characterized by being in contact with each other. The first cylinder with a fuel filler at one end,
A second cylinder having one end connected to the other end of the first cylinder and the other end connected to the fuel tank is provided.
A fuel refueling pipe that guides the fuel poured from the refueling port to the fuel tank.
The first cylinder is designed to have a lower coefficient of thermal expansion than the second cylinder, or is designed to have lower swellability.
The first and second cylinders have the second cylinder inside the other end side of the first cylinder so that the other end side of the first cylinder and one end side of the second cylinder overlap each other. It is integrated by press-fitting or fitting one end side of
A plurality of recesses are formed at positions corresponding to the other end portion of the first cylinder on the outer peripheral surface on one end side of the second cylinder.
The first cylinder is fixed to the second cylinder by deforming a portion of the first cylinder corresponding to each of the recesses and allowing the portion to enter each of the recesses. Fuel refueling pipe.

Images