JP2018070089A - Pipe attachment structure - Google Patents

Abstract

Provided is a pipe mounting structure in which a hollow member and a pipe can be removed and can be easily assembled. A pipe mounting structure in which a pipe 40 is inserted into a pipe mounting member 20 and the pipe 40 is mounted. The pipe mounting member 20 includes a mounting flange section 23, a pipe mounting cylinder section 21, and a tank inner cylinder section 22. Have The seal member 30 is provided between the pipe attachment member 20 and the pipe tip portion 41 provided at the tip of the pipe 40 and attached to the pipe attachment member 20. The seal member 30 has a seal cylindrical portion 31 and a seal engagement portion 33. The pipe end 41 and the pipe mounting cylinder 21 hold the seal cylindrical part 31, and the pipe engaging part 33 holds the pipe front end 41 and attaches the pipe 40 to the hollow member. [Selection] Figure 1

Description

The present invention relates to a pipe mounting structure that is mounted on a hollow member such as an automobile fuel tank.

Pipes for injecting fuel into the fuel tank, sending fuel to the engine, and sending fuel gas to the canister are attached to the hollow member, for example, an automobile fuel tank.
Conventionally, such fuel tanks have been made of metal. However, in recent years, there are also those made of thermoplastic resin due to the weight reduction of vehicles, the absence of rust, and the ease of molding into a desired shape. It has come to be used.

  In any fuel tank 1 made of metal or thermoplastic resin, as shown in FIG. 5, a filler pipe for injecting fuel into the fuel tank 1 together with various pipes and mounting members for attaching fuel components. A filler pipe attachment member 120 for attaching 140 is attached to the outer wall of the fuel tank 1.

For example, as shown in FIG. 6, a filler pipe mounting member 120 for attaching a filler pipe 140 is welded to a tank outer wall 102 of a thermoplastic synthetic resin fuel tank 101 (see, for example, Patent Document 1). The filler pipe attachment member 120 has a cylindrical portion 121 that penetrates the inside and outside of the fuel tank 101, and a flange portion 122 that attaches the cylindrical portion 121 to the tank outer wall 102.

A welded portion 123 is formed on the flange portion 122, the welded portion 123 is welded to the tank outer wall 102, the flange portion 122 is attached, and the cylindrical portion 121 is fixed to the tank outer wall 102.
A filler pipe 140 is inserted into the cylindrical portion 121, and the filler pipe 140 is attached to the fuel tank 101.
However, in this case, it is difficult to remove the filler pipe 140 for repair or the like after the filler pipe 140 is once attached to the fuel tank 101.

Further, as shown in FIG. 7, a filler pipe attachment member 220 for attaching the filler pipe 240 to the tank outer wall 202 of the thermoplastic synthetic resin fuel tank 201 is welded, and the filler pipe attachment member 220 and the filler pipe 240 are connected to a rubber hose 250. Some also connect with.
In this case, the flange portion 222 of the filler pipe mounting member 220 is welded to the tank outer wall 202, and the cylindrical portion 221 of the filler pipe mounting member 220 is positioned in communication with the inside and the outside of the tank outer wall 202.

One end of the rubber hose 250 is attached to the outer portion of the tank outer wall 202 of the cylindrical portion 221 of the filler pipe attachment member 220, and the other end of the rubber hose 250 is attached to the end of the filler pipe 240. The ends of both sides of the rubber hose 250 are fastened with pipe bands 251.
In this case, it is possible to remove the filler pipe 240, but the number of parts is increased, so that the assembling work is required and the cost is also increased.

JP 2005-41298 A

  Therefore, the present invention is intended to provide a pipe mounting structure in which a hollow member and a pipe can be detached and can be easily assembled.

In order to solve the above-mentioned problem, the present invention of claim 1 is a pipe attachment structure attached to a hollow member.
A pipe mounting member for mounting a pipe is attached to the outer wall of the hollow member, the pipe is inserted into the pipe mounting member, and a pipe mounting structure for mounting the pipe,
The pipe mounting member extends from the mounting flange portion that is attached to the outer wall of the hollow member, the pipe mounting cylinder portion that extends from the upper surface of the mounting flange portion and is located outside the outer wall of the hollow member, and the lower surface of the mounting flange portion. It has a tank inner cylinder part located inside the hollow member,
A seal member is provided between the pipe attachment member and the pipe tip portion provided at the pipe tip and attached to the pipe attachment member, and the seal member is a sealed cylindrical portion located between the pipe attachment member and the filler pipe And a seal engaging portion that engages with the pipe tip,
A pipe attachment structure characterized in that a pipe is attached to a hollow member while holding a pipe tip by a seal engaging part while holding a seal cylindrical part between a pipe tip and a pipe attachment cylinder.

According to the first aspect of the present invention, in the pipe mounting structure to be mounted on the hollow member, the pipe mounting member for mounting the pipe is mounted on the outer wall of the hollow member, the pipe is inserted into the pipe mounting member, and the pipe mounting structure for mounting the pipe is used. The pipe attachment member includes an attachment flange portion attached to the outer wall of the hollow member, a pipe attachment cylinder portion extending from the upper surface of the attachment flange portion and positioned outside the outer wall of the hollow member, and a lower surface of the attachment flange portion. It has a tank inner cylinder part extended and located in the inside of a hollow member.

For this reason, by attaching the attachment flange portion of the pipe attachment member to the outer wall of the hollow member, the pipe attachment tube portion can be positioned on the outer wall of the hollow member and the pipe can be attached, and the tank inner tube portion can be attached to the hollow member. It is possible to inject fuel or the like from the pipe into the hollow member.

A seal member is provided between the pipe attachment member and the pipe tip portion provided at the pipe tip and attached to the pipe attachment member, and the seal member is a sealed cylindrical portion located between the pipe attachment member and the filler pipe And a seal engaging part that engages with the pipe tip part. For this reason, between the pipe and the pipe mounting member can be sealed with the seal cylindrical portion of the seal member, and the tip end portion of the pipe can be held by the seal engagement portion. Further, the pipe can be easily detached from the pipe mounting member by elastically deforming the seal member and pulling out the tip of the pipe.

Since the seal cylindrical portion is sandwiched between the pipe tip portion and the pipe attachment cylinder portion, the seal between the pipe and the pipe attachment member can be sealed by the seal cylinder portion of the seal member.
Since the pipe front end is held by the seal engaging portion and the pipe is attached to the hollow member, the pipe front end can be inserted into the seal engaging portion and the seal member and the pipe front end can be attached to the pipe attaching member. it can.

The present invention of claim 2 is a pipe mounting structure in which the pipe attached to the hollow member is a filler pipe for injecting fuel into the fuel tank.

In the present invention of claim 2, since the pipe attached to the hollow member is a filler pipe for injecting fuel into the fuel tank, the tip of the filler pipe is attached to the pipe attachment member with a simple structure to hold the filler pipe firmly. can do. It is also easy to remove the filler pipe from the fuel tank.

According to the third aspect of the present invention, the seal engagement portion of the seal member has a seal engagement portion groove formed in a groove shape on the outer periphery of the lower end of the seal cylindrical portion, and the pipe tip portion is formed in the seal engagement portion groove. It is the attachment structure of the pipe in which is inserted.

According to a third aspect of the present invention, the seal engagement portion of the seal member has a seal engagement portion groove formed in a groove shape on the outer periphery of the lower end of the seal cylindrical portion, and a pipe tip portion is formed in the seal engagement portion groove. Has been inserted. For this reason, if a pipe front-end | tip part is inserted and pressed into a seal engaging part groove part, a pipe front-end | tip part can be easily attached to a pipe attachment member with a seal member. Further, the seal engaging portion groove portion can hold the tip of the pipe tip portion and seal between the pipe tip portion and the seal engaging portion groove portion.

According to a fourth aspect of the present invention, there is provided a pipe mounting structure in which a pipe tip protrusion is formed on the outer peripheral side of the pipe tip so as to contact the inner surface of the seal engaging groove.

According to the fourth aspect of the present invention, since the pipe tip protrusion that contacts the inner surface of the seal engagement groove is formed on the outer peripheral side of the pipe tip, the seal engagement groove can reliably hold the pipe tip. Further, the pipe tip protrusion presses the inner surface of the seal engaging groove, so that the sealing performance is improved and the assembly is easy.

According to the fifth aspect of the present invention, a ring-shaped pipe tip recess is formed on the outer peripheral surface of the pipe tip, and the ring-shaped pipe tip recess of the pipe tip is engaged with the seal engagement groove of the seal engagement part. It is the attachment structure of the pipe which formed the seal engaging part protrusion in the ring shape.

According to the fifth aspect of the present invention, a ring-shaped pipe tip recess is formed on the outer peripheral surface of the pipe tip, and the ring-shaped pipe tip recess of the pipe tip is engaged with the seal engagement groove of the seal engagement part. A seal engagement portion ridge was formed in a ring shape. For this reason, the sealing performance between the outer peripheral surface of a pipe front-end | tip part and a seal engaging part groove part can be improved.

According to the sixth aspect of the present invention, a ring-shaped pipe-attaching cylinder ridge is formed on the outer peripheral surface of the pipe-attaching cylinder so as to contact the inner surface of the seal-cylindrical part of the seal member. It is the attachment structure of the pipe which pressed to the seal | sticker cylindrical part.

In this invention of Claim 6, the ring-shaped pipe attachment cylinder part protrusion which contacts the inner surface of the seal cylinder part of a sealing member is formed in the outer peripheral surface of a pipe attachment cylinder part, A pipe attachment cylinder part protrusion part Was pressed into the seal cylindrical part. For this reason, while being able to improve the sealing performance between the pipe attachment cylinder part of a pipe attachment member, and the seal cylinder part of a seal member, a seal member can be made hard to remove | deviate from a pipe attachment cylinder part.

According to the seventh aspect of the present invention, the thickness on the tip side of the seal cylindrical portion of the seal member is formed to be thicker than the thickness on the side where the seal engaging portion is provided, and the portion where the thickness changes is inclined. It is the attachment structure of the pipe formed in the shape.

In the present invention of claim 7, the thickness of the seal tubular portion of the seal member is formed to be thicker than the thickness on the side where the seal engaging portion is provided, and the portion where the thickness changes is inclined. Formed into a shape. For this reason, the part which contacts the front-end | tip of a pipe attachment cylinder part is thickened, and the adhesive force of the front end side of a seal | sticker cylindrical part and the front-end | tip of a pipe attachment cylinder part is improved, and sealing performance and holding power are improved. be able to. Since the portion where the thickness changes is formed in an inclined surface shape, the friction between the pipe mounting cylinder part and the seal cylindrical part is reduced when the pipe mounting cylinder part is inserted, thereby facilitating the insertion.

The present invention of claim 8 is a pipe mounting structure in which the seal member is formed of synthetic rubber.

In the present invention of claim 8, since the seal member is made of synthetic rubber, it has elasticity, is easily deformed, and is easy to assemble and remove, and after assembly, the pipe mounting member and the pipe tip portion It is possible to improve the sealing property.

The present invention of claim 9 is a pipe mounting structure in which the pipe mounting member is formed of synthetic resin or metal.

In this invention of Claim 9, the pipe attachment member is formed with the synthetic resin or the metal. When formed of synthetic resin, it can be firmly welded to a hollow member made of synthetic resin, contributes to weight reduction of the component, does not generate rust, and has excellent durability. When it is made of metal, the rigidity can be increased.

The present invention of claim 10 is a pipe mounting structure in which the outer peripheral surface of the pipe tip is fastened by a pipe band.

In the tenth aspect of the present invention, since the outer peripheral surface of the pipe tip end portion is fastened by the pipe band, the pipe tip end portion is firmly attached to the pipe attachment member, and the seal member can be strongly clamped to improve the sealing performance. Moreover, if a pipe band is removed, a pipe front-end | tip part can be removed easily.

A seal member is provided between the pipe attachment member and the pipe tip portion provided at the tip of the pipe and attached to the pipe attachment member. The seal member sandwiches the seal cylindrical portion between the pipe tip portion and the pipe attachment cylinder portion. Therefore, it is possible to seal between the pipe and the pipe mounting member with the seal cylindrical portion of the seal member. Since the pipe front end is held by the seal engaging part and the pipe is attached to the hollow member, the pipe front end is inserted into the seal engaging part, and the seal member and the pipe front end are easily attached to the pipe attaching member. be able to

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a cross-sectional view of a state where a seal member and a pipe tip are attached to a filler pipe attachment member. In embodiment of this invention, the process of attaching a seal member and a pipe front-end | tip part to a filler pipe attachment member is shown, and it is sectional drawing of the state which attached the seal member to the pipe front-end | tip part. In embodiment of this invention, it shows the process of attaching a sealing member and a pipe front-end | tip part to a filler pipe attachment member, It is sectional drawing of the state in the middle of attaching a seal member to a pipe front-end | tip part and inserting in a filler pipe attachment member is there. In embodiment of this invention, the process of attaching a seal member and a pipe front-end | tip part to a filler pipe attachment member is shown, It is sectional drawing of the state which attached the seal member to the pipe front-end | tip part and inserted in the filler pipe attachment member. It is sectional drawing of a fuel tank. It is sectional drawing of the attachment part of the filler pipe attachment member of the conventional fuel tank. It is sectional drawing of the attachment part of the filler pipe attachment member of the other conventional fuel tank.

The present invention can be widely used for a pipe attachment structure attached to a hollow member. The present invention will be described with reference to FIGS. 1 to 5 by taking the fuel tank 1 and filler pipe 40 as an example. It can also be used to attach various pipes and hoses used in the fuel tank 1.
FIG. 5 is a cross-sectional view of the fuel tank 1 in which the filler pipe 40 mounting structure according to the embodiment of the present invention is used.

As shown in FIG. 5, the fuel tank 1 is formed by blow molding, and the tank outer wall 2 is formed integrally. The tank outer wall 2 can be formed of one layer of thermoplastic synthetic resin, or can be formed to have a plurality of layers of thermoplastic synthetic resin.
When it is formed of a plurality of layers, it can be formed by combining a layer having rigidity and a layer having low fuel permeability.

When formed with multiple layers, for example, the central layer is made of ethylene vinyl alcohol copolymer (EVOH) or nylon, and a barrier layer for preventing fuel permeation is formed from the modified polyethylene above and below the barrier layer. And an outer layer formed of high-density polyethylene (HDPE) on each outer surface of the adhesive layer.

  A filler pipe mounting member 20 shown in FIG. 1 and a pipe mounting portion 10 that is a flat portion to which the filler pipe mounting member 20 is attached are formed on the upper portion of the tank outer wall 2. The filler pipe attachment member 20 attaches a filler pipe 40 that injects fuel into the fuel tank 1.

Further, as shown in FIG. 5, a breather port mounting portion 7 is also formed on the upper portion of the tank outer wall 2. The breather port mounting portion 7 is for mounting a breather hose (not shown) for allowing the gas in the fuel tank 1 to escape outside the tank when fuel is supplied. Reference numeral 8 denotes a cut-off valve that prevents fuel leakage from the fuel tank 1 when the vehicle falls.
Note that a hose clamp for holding various hoses such as a fuel transfer hose may be provided on the upper surface of the tank outer wall 2. The present invention can also be used for mounting members for attaching these hoses.

  A fuel pump mounting hole 4 is further formed on the upper surface of the tank outer wall 2, and a sub tank 5 is mounted from the fuel pump mounting hole 4 to the inner surface of the lower portion of the tank outer wall 2. The fuel pump mounting hole 4 is closed by a lid body 50, and the lid body 50 is screwed around the fuel pump mounting hole 4 by a lock plate 51. A seal ring 52 is attached between the fuel pump attachment hole 4 and the lid 50 to seal between the fuel pump attachment hole 4 and the lid 50.

A fuel pump unit 6 is attached in the sub tank 5. The sub tank 5 is provided so that the fuel pump unit 6 can reliably send the fuel in the fuel tank 1 to the engine when the vehicle tilts or vibrates. The fuel pump unit 6 is attached to the lid 50, and repair and maintenance are performed. A pipe extends from the fuel pump unit 6, and a fuel main port mounting portion 9 is connected to the lid 50 at the top of the tank outer wall 2. A fuel pipe (not shown) for sending fuel to the engine is attached to the fuel main port attachment portion 9.

As shown in FIG. 5, a pipe mounting portion 10 is formed on the upper portion of the tank outer wall 2 of the fuel tank 1. As shown in FIGS. 3 and 4, the pipe attachment portion 10 is formed around the tank opening 11, which is a hole formed in the fuel tank 1 to which a filler pipe attachment member 20 described later is attached, and around the tank opening 11. An attachment member holding flange 12 for attaching the pipe attachment member 20 is formed. The mounting member holding flange 12 has a flat upper surface for mounting the filler pipe mounting member 20.

The filler pipe 40 is a pipe that connects a fuel inlet (not shown) of the vehicle body and the fuel tank 1 and is formed of a fuel oil-resistant synthetic resin or the like. A filler pipe distal end portion 41 formed in a cylindrical shape is formed at the distal end of the filler pipe 40. As shown in FIG. 1, the filler pipe tip 41 can be formed with a diameter larger than that of the main body of the filler pipe 40.

As shown in FIG. 1, the filler pipe tip 41 can form a filler pipe tip protrusion 43 bent in the outer circumferential direction. In addition, as shown in FIG. 2, a ring-shaped filler pipe tip recess 42 can be formed on the outer peripheral surface slightly away from the tip of the filler pipe tip 41. The filler pipe tip protrusion 43 and the filler pipe tip recess 42 can improve the sealing performance between the seal engagement portion groove 33a of the seal member 30 described later.

Next, based on FIG. 1 and FIG. 2, the filler pipe attachment member 20 which is a pipe attachment member, and the seal member 30 used between the filler pipe attachment member 20 and the filler pipe front-end | tip part 41 are demonstrated.
The filler pipe mounting member 20 includes a filler pipe mounting cylinder 21 into which a filler pipe tip 41 at the tip of the filler pipe 40 is inserted, a tank inner cylinder 22 located inside the fuel tank 1, and a pipe mounting section 10. An attachment flange portion 23 attached to the member holding flange 12 is provided.

The mounting flange portion 23 is formed in a disk shape having a center hole 25 through which the filler pipe mounting cylinder portion 21 and the tank inner cylinder portion 22 pass in the center, and on the outer periphery of the lower surface (the surface facing the mounting flange portion 23) downward. A mounting flange end portion 24 that protrudes in a ring shape is formed. The mounting flange portion distal end portion 24 is welded or bonded to the mounting member holding flange 12 of the tank outer wall 2.

For this reason, it is preferable that the attachment flange part 23 is formed with the same kind of material as the outer surface of the tank outer wall 2 of the fuel tank 1. Since the mounting flange portion distal end portion 24 is welded or bonded to the mounting member holding flange 12, the mounting flange portion 23 is firmly fixed to the pipe mounting portion 10, so that the mounting flange portion distal end portion 24 and the mounting member holding flange 12 are interposed. The sealing property can be ensured.

A cylindrical filler pipe mounting tube portion 21 is formed from the periphery of the center hole 25 on the upper surface of the mounting flange portion 23 toward the outside of the tank outer wall 2. A filler pipe tip 41 of the filler pipe 40 is attached to the filler pipe attachment cylinder portion 21 via the seal member 30. On the outer periphery in the vicinity of the tip of the filler pipe attachment cylinder portion 21, a filler pipe attachment cylinder portion protrusion 21a protruding outward in a ring shape can be formed.

A cylindrical tank inner cylinder portion 22 is formed from the periphery of the center hole 25 on the lower surface of the mounting flange portion 23 toward the inside of the fuel tank 1. For this reason, when the attachment flange portion 23 is attached to the pipe attachment portion 10, the tank inner cylinder portion 22 can be attached so as to be located on the inner side of the fuel tank 1 with respect to the surface of the tank outer wall 2 of the fuel tank 1.

The filler pipe mounting member 20 is molded by injection molding separately from the fuel tank 1. It is preferable that the filler pipe mounting cylinder portion 21, the tank inner cylinder portion 22, and the mounting flange portion 23 are formed of the same material. When formed from another material, it is necessary that the material of the filler pipe mounting cylinder part 21 and the tank inner cylinder part 22 and the material of the mounting flange part 23 be fused together at the time of injection molding.

The same material as the material of the tank outer wall 2 is used for the mounting flange portion 23. For example, high-density polyethylene or polypropylene that is easy to bond and has high rigidity is used. As a result, the mounting flange end 24 is fused to the tank outer wall 2.
The filler pipe mounting cylinder portion 21 and the tank inner cylinder portion 22 can use a synthetic resin such as polyacetal or polyamide, which is a fuel oil-resistant material.
In addition, the filler pipe attachment member 20 can also be formed with a metal. In this case, the rigidity of the filler pipe mounting member 20 can be increased.

Next, the seal member 30 will be described.
As shown in FIG. 1, the seal member 30 includes a seal tubular portion 31 positioned between a filler pipe attachment tubular portion 21 of the filler pipe attachment member 20 and a filler pipe distal end portion 41 of the filler pipe 40, and a filler pipe distal end. A seal engaging portion 33 that engages with the portion 41 is provided.

A seal member distal end portion 32 that extends in the inner diameter direction is formed in a ring shape at the distal end of the seal cylindrical portion 31. As shown in FIG. 4, the seal member distal end portion 32 can contact the distal end of the filler pipe attachment cylinder portion 21 to seal between the filler pipe attachment member 20 and the seal member 30.

It is possible to form the seal cylindrical portion thick portion 31a in which the thickness of the seal cylindrical portion 31 of the seal member 30 is thicker than the thickness on the side where the seal engagement portion 33 is provided. In this case, the sealing force and the holding force can be improved by improving the adhesion between the thick cylindrical portion 31a of the seal cylindrical portion and the distal end side of the seal cylindrical portion 31.

As shown in FIG. 2, the portion below the seal tubular portion thick portion 31 a is thinner than the seal tubular portion thick portion 31 a of the seal tubular portion 31, and the thickness changes. The boundary part which is a part forms a seal member inclined surface 34. For this reason, when the seal cylindrical part 31 of the seal member 30 and the filler pipe tip part 41 of the filler pipe 40 are inserted into the filler pipe attachment cylinder part 21, friction is reduced to the seal member inclined surface 34, and the seal is provided. The member inclined surface 34 reduces the friction between the filler pipe mounting cylinder portion 21 and the seal cylindrical portion 31 and facilitates insertion.

In addition, when the filler pipe mounting cylinder portion ridge portion 21a is provided on the filler pipe mounting member 20, the filler pipe mounting cylinder portion ridge portion 21a is press-fitted into the filler pipe mounting cylinder portion 21 to provide sealing performance and holding force. Can be improved.
In addition, when the seal tubular portion thick portion 31a is formed, the filler pipe mounting tube portion protrusion 21a is press-fitted into the seal tubular portion thick portion 31a to further improve the sealing performance and holding force. Can be made.

A seal engagement portion 33 that engages with the filler pipe tip portion 41 is formed at the lower end of the seal cylindrical portion 31. As shown in FIG. 1, the seal engagement portion 33 has a seal engagement portion groove portion 33 a formed in a ring-like groove shape on the outer periphery of the lower end of the seal cylindrical portion 31. The seal engagement portion groove 33a is formed with a seal engagement portion outer peripheral wall 33b that forms the outer periphery thereof. When the filler pipe tip 41 is attached to the seal member 30, the filler pipe tip 41 is inserted into the seal engaging groove 33a, and the seal engaging portion outer peripheral wall 33b holds the filler pipe tip 41. .

For this reason, if the filler pipe tip 41 is inserted into the seal engaging groove 33a and pressed along the filler pipe mounting cylinder 21, the filler pipe tip 41 can be easily inserted into the filler pipe mounting member 20 together with the seal member 30. Can be installed on. Moreover, the seal engaging part groove part 33a can hold | maintain the front-end | tip of the filler pipe front-end | tip part 41, and can seal between the filler pipe front-end | tip part 41 and the seal engaging part groove part 33a.

As shown in FIG. 2, a ring-shaped filler pipe tip recess 42 is formed on the outer peripheral surface of the filler pipe tip 41, and the seal engaging portion outer peripheral wall 33b of the seal engaging portion groove 33a is engaged with the filler pipe tip recess 42. A ring-shaped seal engaging portion protrusion 33c can be formed. In this case, the sealing performance between the outer peripheral surface of the filler pipe tip portion 41 and the seal engaging portion groove portion 33a can be improved.

The seal member 30 can be formed of synthetic rubber. As the synthetic rubber, a material having excellent oil resistance can be selected. For example, NBR (acrylonitrile butadiene rubber) can be used. Further, different materials can be used for the inner layer and the outer layer.
When synthetic rubber is used, the elasticity is excellent and the assembly and removal of the filler pipe tip 41 are easy, and after the assembly, the filler pipe mounting member 20 and the filler pipe tip 41 are brought into close contact with each other to provide a sealing property. Can be improved.

Next, based on FIGS. 1-4, the method to attach the filler pipe front-end | tip part 41 to the filler pipe attachment member 20 is demonstrated.
First, the filler pipe attachment member 20 is attached to the pipe attachment portion 10 of the tank outer wall 2 of the fuel tank 1. The attachment flange portion 23 of the filler pipe attachment member 20 is welded to the attachment member holding flange 12 of the pipe attachment portion 10.

As shown in FIG. 1, when the mounting flange portion distal end portion 24 extending downward is formed on the mounting flange portion 23, the mounting flange portion distal end portion 24 is melted and welded to the mounting member holding flange 12. Can do. In this case, the attachment flange end 24 can be reliably welded to the attachment member holding flange 12 of the tank outer wall 2 to improve the adhesion.

Next, as shown in FIG. 2, the filler pipe distal end portion 41 of the filler pipe 40 is inserted into the seal engagement portion groove portion 33 a of the seal engagement portion 33 of the seal member 30.
Thereafter, as shown in FIG. 3, the filler pipe distal end portion 41 and the seal member 30 are inserted together into the filler pipe mounting cylinder portion 21 of the filler pipe mounting member 20.

At this time, as shown in the arrow in FIG. 3, the seal tubular portion 31 of the seal member 30 can be bent so as to be in close contact with the inner surface of the filler pipe tip portion 41 as it is inserted into the filler pipe attachment tube portion 21. . Further, since the seal member inclined surface 34 is provided, up to the seal member inclined surface 34, there is little friction and interference with the seal cylindrical portion 31 during insertion, and insertion is easy. Also in the sealing member inclined surface 34, insertion friction when the tip of the filler pipe mounting cylinder portion 21 is inserted can be reduced.
Further, as shown in FIG. 4, when the filler pipe tip 41 is inserted, the seal engaging portion 33 is in close contact with the mounting flange portion upper surface portion 23 a of the filler pipe mounting member 20.

  At that time, when the filler pipe attachment cylinder part protrusion 21a is provided on the filler pipe attachment member 20, the filler pipe attachment cylinder part protrusion 21a is pressed by the seal cylinder part 31 to improve the sealing performance. it can. When the seal tubular portion 31 is provided with the seal tubular portion thick portion 31a, the filler pipe mounting tubular portion protruding portion 21a further bites into the seal tubular portion thick portion 31a to further improve the sealing performance. Can be made.

In addition, as shown in FIG. 1, when the filler pipe tip protrusion 43 is provided, the filler pipe tip protrusion 43 abuts on the inner surface of the seal engaging portion outer peripheral wall 33b, thereby improving the sealing performance. it can. Furthermore, as shown in FIG. 2, even when the seal engagement portion protrusion 33 c is fitted in the filler pipe tip recess 42, the sealing performance can be further improved.

Furthermore, after inserting the filler pipe tip 41, the pipe band 60 can be fastened to the outer peripheral surface of the filler pipe tip 41 as shown in FIG. In this case, the filler pipe tip 41 can be firmly attached to the filler pipe attachment member 20, and the sealing member 30 can be strongly held to improve the sealing performance. Moreover, if the pipe band 60 is removed, the filler pipe front-end | tip part 41 can be removed easily.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Tank outer wall 20 Filler pipe attachment member 21 Filler pipe attachment cylinder part 22 Tank inner cylinder part 23 Attachment flange part 30 Seal member 31 Seal member cylindrical part 33 Seal engagement part 33a Seal engagement part groove part 40 Filler pipe 41 Filler pipe tip 60 Pipe band

Claims (10)

In the mounting structure of the pipe attached to the hollow member,
A pipe attachment member for attaching the pipe is attached to the outer wall of the hollow member, the pipe is inserted into the pipe attachment member, and a pipe attachment structure for attaching the pipe,
The pipe attachment member includes an attachment flange portion attached to the outer wall of the hollow member, a pipe attachment cylinder portion extending from the upper surface of the attachment flange portion and positioned outside the outer wall of the hollow member, and the attachment flange portion. A tank inner cylinder portion extending from the lower surface and positioned inside the hollow member;
A seal member is provided between the pipe attachment member and a pipe tip provided at the tip of the pipe and attached to the pipe attachment member, and the seal member is provided between the pipe attachment member and the filler pipe. A seal tubular portion positioned; and a seal engagement portion that engages with the pipe tip.
A pipe characterized in that the pipe cylindrical portion is sandwiched between the pipe tip portion and the pipe mounting cylinder portion, the pipe tip portion is held by the seal engaging portion, and the pipe is attached to the hollow member. Mounting structure. 2. The pipe mounting structure according to claim 1, wherein the pipe is a filler pipe for injecting fuel into the fuel tank. The seal engagement portion of the seal member has a seal engagement portion groove portion formed in a groove shape on the outer periphery of the lower end of the seal cylindrical portion, and the pipe tip portion is inserted into the seal engagement portion groove portion. The pipe mounting structure according to claim 1 or 2. The pipe attachment structure according to claim 3, wherein a pipe tip protrusion that abuts on an inner surface of the seal engagement portion groove is formed on an outer peripheral side of the pipe tip. A ring-shaped pipe tip recess is formed on the outer peripheral surface of the pipe tip, and the ring-shaped pipe engaging with the ring-shaped pipe tip recess of the pipe tip in the seal engagement groove of the seal engagement part. The pipe mounting structure according to claim 4, wherein a seal engagement portion protrusion is formed. On the outer peripheral surface of the pipe mounting tube portion, a ring-shaped pipe mounting tube portion protruding portion that abuts on the inner surface of the seal cylindrical portion of the seal member is formed, and the pipe mounting tube portion protruding portion is connected to the seal tube. The pipe mounting structure according to any one of claims 1 to 5, wherein the pipe mounting structure is pressed against the shaped portion. The thickness of the tip side of the seal cylindrical part of the seal member is formed to be thicker than the thickness of the side on which the seal engagement part is provided, and the portion where the thickness changes is formed in an inclined surface shape. The pipe mounting structure according to any one of claims 1 to 6. 8. The pipe mounting structure according to claim 1, wherein the seal member is made of synthetic rubber. 9. The pipe mounting structure according to claim 1, wherein the pipe mounting member is made of synthetic resin or metal. The pipe mounting structure according to any one of claims 1 to 9, wherein an outer peripheral surface of the pipe tip portion is fastened by a pipe band.

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