JP2018122758A - Pipe mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe mounting structure allowing removal of a hollow member and a pipe and having excellent sealability.SOLUTION: In a pipe mounting structure for mounting a pipe to a hollow member, a pipe mounting member 20 has a mounting flange 23, a pipe mounting cylinder portion 21, and a tank inner cylinder portion 22. In a pipe tip portion 41, a pipe slit 42 is formed from its tip. A sealing member 30 is provided between the pipe mounting member 20 and the pipe tip portion 41. The sealing member 30 has a sealing cylindrical portion 31, and a sealing member outer peripheral projection 32 fitted into the pipe slit 42 is formed on the outer periphery of the sealing cylindrical portion 31. In a state where the sealing member 30 is inserted into the pipe mounting cylinder portion 21, the pipe slit 42 is fitted to the sealing member outer peripheral projection 32, whereby the pipe tip portion 41 is mounted on the pipe mounting member 20 through the sealing member 30. The sealing member outer peripheral projection 32 and the pipe tip portion 41 are fastened with a pipe band 60.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe attachment structure for attaching a pipe to 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. 11, 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. 12, a filler pipe attaching member 120 for attaching a filler pipe 140 is welded to the 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 a cylindrical part 121 having a ring-shaped protrusion on the outer peripheral surface, 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. 13, a flange portion 222 of a filler pipe mounting member 220 for attaching a synthetic resin filler pipe 240 is welded to the tank outer wall 202 of a thermoplastic synthetic resin fuel tank 201 to fill the filler pipe mounting member 220. In some cases, the cylindrical portion 221 and the tip end portion 241 of the filler pipe 240 are fastened by a pipe band 260.

In this case, the filler pipe 240 can be removed from the filler pipe mounting member 220, but there are some that the filler pipe 240 has high rigidity and cannot be sufficiently tightened by the pipe band 260. In some cases, a seal member is inserted between the filler pipe mounting member 220 and the tip 241 of the filler pipe 240.
In this case, the insertion load when the front end portion 241 of the filler pipe 240 is inserted into the filler pipe mounting member 220 in order to prevent the front end portion 241 of the filler pipe 240 from coming off from the filler pipe mounting member 220 or to prevent the disconnection. May be larger.

JP 2005-41298 A

  In view of this, the present invention is intended to provide a pipe mounting structure in which a hollow member and a pipe can be removed, and which has an excellent sealing property.

In order to solve the above problem, the present invention of claim 1 is a pipe mounting structure for mounting a pipe 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,
The pipe tip forms a pipe tip attached to the pipe mounting cylinder, the pipe tip is formed with a pipe slit extending in the axial direction from the tip,
A seal member is provided between the pipe attachment member and the pipe tip, and the seal member has a seal cylindrical portion located between the pipe attachment member and the pipe tip, and the pipe is disposed on the outer periphery of the seal tubular portion. A seal member outer peripheral projection that fits into the slit is formed,
With the seal member inserted into the pipe mounting cylinder of the pipe mounting member, the pipe slit of the pipe leading end is fitted to the sealing member outer peripheral protrusion of the sealing member, and the pipe leading end is attached to the pipe via the sealing member. The pipe mounting structure is characterized in that the pipe is mounted by fastening the outer peripheral protrusion of the seal member and the tip of the pipe with a pipe band.

According to the first aspect of the present invention, in the pipe mounting structure for attaching a pipe to a 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 is mounted for mounting 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 an attachment flange portion. It has a tank inner cylinder part which extends from the lower surface and is located inside the 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.

The tip of the pipe forms a pipe tip attached to the pipe mounting cylinder, and the pipe tip is formed with a pipe slit extending in the axial direction from the tip. For this reason, the pipe slit is expanded or contracted, the rigidity of the pipe tip is lowered, and it is easy to attach and detach the pipe tip from the pipe mounting cylinder of the pipe mounting member.

A seal member is provided between the pipe attachment member and the pipe tip, and the seal member has a seal tubular portion located between the pipe attachment member and the pipe tip. For this reason, the space between the pipe and the pipe mounting member can be sealed by the seal cylindrical portion of the seal member, and the tip of the pipe can be held. 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 member outer peripheral protrusion that fits into the pipe slit is formed on the outer periphery of the seal cylindrical portion, the pipe slit portion can be sealed with the seal member outer peripheral protrusion.

With the seal member inserted into the pipe mounting cylinder of the pipe mounting member, the pipe slit of the pipe leading end is fitted to the sealing member outer peripheral protrusion of the sealing member, and the pipe leading end is attached to the pipe via the sealing member. It is attached to the member. For this reason, a seal member and a pipe front-end | tip part can be reliably clamp | tightened with a pipe band to the pipe attachment cylinder part of a pipe attachment member, and attachment and removal are easy.

The pipe is attached by tightening the outer peripheral protrusion of the seal member and the tip of the pipe with a pipe band. For this reason, it is possible to improve the sealing performance by directly tightening the outer peripheral protrusion of the seal member with the pipe band and tightening both the seal member and the tip of the pipe to the pipe mounting cylinder portion of the pipe mounting member.

The present invention of claim 2 is a pipe mounting structure having a gap extending in the axial direction between the seal member outer peripheral protrusion and the pipe slit when the pipe slit at the tip of the pipe is fitted into the seal member outer peripheral protrusion. is there.

According to the second aspect of the present invention, when the pipe slit at the tip of the pipe is fitted to the outer circumferential protrusion of the seal member, there is a gap extending in the axial direction between the outer circumferential protrusion of the seal member and the pipe slit. For this reason, it is easy to insert the seal member outer periphery protrusion into the pipe slit of the pipe tip portion, and when the seal member outer periphery protrusion and the pipe tip portion are tightened with the pipe band, the seal member outer periphery protrusion is bent, It is easy to tighten the pipe band.

The present invention of claim 3 is a pipe mounting structure in which a ridge that protrudes circumferentially in the outer circumferential direction is formed at the tip of the pipe tip.

According to the third aspect of the present invention, since the protrusion that protrudes circumferentially in the outer circumferential direction is formed at the tip of the pipe tip, when the pipe is pulled from the pipe mounting cylinder of the pipe mounting member, the pipe is connected to the protrusion. The band is caught and it is difficult to pull out the pipe.

According to a fourth aspect of the present invention, there is provided a pipe mounting structure in which a ridge portion projecting circumferentially in the outer peripheral direction is formed on a pipe body side of a portion adjacent to a pipe slit at a tip portion of the pipe.

In the present invention of claim 4, the ridge portion protruding circumferentially in the outer peripheral direction is formed on the pipe main body side of the portion near the pipe slit at the tip of the pipe. Therefore, the pipe slit can be easily opened when the pipe is inserted, and the pipe band can be positioned by preventing the shift of the pipe band at the protruding portion.

The present invention of claim 5 is a pipe mounting structure in which a slit extending in the axial direction is provided on the outer peripheral surface side of the outer peripheral protrusion of the seal member.

According to the fifth aspect of the present invention, since the slit extending in the axial direction is provided on the outer peripheral surface side of the seal member outer peripheral protrusion, the rigidity of the seal member outer peripheral protrusion is lowered to facilitate bending, and the seal member outer peripheral protrusion and the pipe tip When the portion is tightened with the pipe band, the outer peripheral protrusion of the seal member is bent, and it is easy to tighten the pipe band.

The present invention of claim 6 is a pipe mounting structure provided with a seal member inner peripheral protrusion projecting toward the inner peripheral side of the seal member.

In the present invention of claim 6, since the seal member inner peripheral protrusion projecting toward the inner peripheral side of the seal member is provided, the seal member inner peripheral protrusion is inserted when the seal member is inserted into the pipe mounting tube portion of the pipe mounting member. Can abut against the pipe mounting cylinder portion to strongly hold the seal member on the pipe mounting cylinder portion, thereby making it difficult to come off.

The present invention of claim 7 is a pipe mounting structure in which the seal member is formed of synthetic rubber.

In the present invention of claim 7, 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 attachment cylinder of the pipe attachment member It is possible to improve the sealing performance by closely contacting the portion and the tip of the pipe.

The present invention of claim 8 is a pipe mounting structure in which the hollow member is a fuel tank for an automobile, and the pipe is a filler pipe that supplies oil to the fuel tank for an automobile.

In this invention of Claim 8, a hollow member is a fuel tank for motor vehicles, and a pipe is a filler pipe which supplies oil to a fuel tank for motor vehicles. For this reason, the tip of the filler pipe can be attached to the pipe attachment member with a simple structure, and the filler pipe can be firmly held in the fuel tank. It is also easy to remove the filler pipe from the fuel tank.

With the seal member inserted into the pipe mounting cylinder of the pipe mounting member, the pipe slit at the tip of the pipe is fitted to the outer peripheral protrusion of the sealing member of the sealing member, and the seal member and the pipe tip are attached to the pipe with the pipe band. It can be securely fastened to the pipe mounting cylinder of the member, and is easy to attach and remove.
Since the outer periphery of the seal member and the tip of the pipe are tightened with the pipe band, the outer periphery of the seal member is directly tightened with the pipe band, and both the seal member and the tip of the pipe are tightened to the pipe mounting cylinder of the pipe mounting member. Thus, the sealing property can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a longitudinal sectional view of a state in which a seal member and a pipe tip are attached to a filler pipe attachment member and a seal member outer peripheral protrusion is tightened with a pipe band. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a longitudinal sectional view in a state where a seal member and a pipe tip end are attached to a filler pipe attachment member and the filler pipe tip end is tightened with a pipe band. The embodiment of the present invention is shown and it is a side view of a filler pipe tip part. The embodiment of the present invention is shown and it is a front view of a filler pipe tip part. The embodiment of the present invention is shown and is a side view of a seal member. The embodiment of the present invention is shown and it is a front view of a seal member. 1, showing an embodiment of the present invention, is a sectional view of a seal member. (A) shows other embodiment of this invention, and is a side view of the state which attached the seal member and the pipe front-end | tip part to the filler pipe attachment member, and fastened the seal member outer periphery protrusion with the pipe band. (B) is sectional drawing of the part of a filler pipe 2nd flange part. The other embodiment of the present invention is shown, and is a cross-sectional view perpendicular to the axial direction in a state in which a seal member and a pipe tip are attached to a filler pipe attachment member and a seal member outer peripheral protrusion is fastened by a pipe band. In another embodiment of the present invention, a slit is formed in the outer peripheral protrusion of the seal member, the seal member and the pipe tip are attached to the filler pipe attachment member, and the seal member outer protrusion is tightened with a pipe band. It is sectional drawing orthogonal to the axial direction of this. 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.

  Although the present invention can be widely used for a pipe attachment structure attached to a hollow member, an embodiment of the present invention will be described based on FIGS. 1 to 11 by taking a fuel tank 1 and a filler pipe 40 as an example. It can also be used to attach various pipes and hoses used in the fuel tank 1.

About embodiment of this invention, first, the fuel tank 1 used for the embodiment and its pipe attachment part 10, the filler pipe 40, the filler pipe attachment member 20, and each shape of the seal member 30 are demonstrated, Then, The attachment structure of the filler pipe 40 will be described.
FIG. 11 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. 11, 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.

As shown in FIG. 11, a pipe attachment portion 10 is formed on the upper portion of the tank outer wall 2 of the fuel tank 1. As shown in FIG. 1, the pipe attachment portion 10 is formed around a tank opening 11 that 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, and the filler pipe attachment member 20. A mounting member holding flange 12 is formed. The mounting member holding flange 12 has a flat upper surface for mounting the filler pipe mounting member 20.

As shown in FIG. 11, 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.

Next, the filler pipe 40 is demonstrated based on FIG. 3 and FIG. 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 filler pipe main body 43 that is the main body of the filler pipe 40.

The filler pipe tip 41 is attached to the filler pipe attachment member 20. A filler pipe slit portion 42 extending in the axial direction from the filler pipe mounting member 20 is formed at the filler pipe tip portion 41. The filler pipe slit portion 42 is formed in a U shape, and the bottom of the U shape forms a filler pipe slit portion bottom portion 42a. In the filler pipe slit portion 42, a seal member outer peripheral projection 32 of the seal member 30 described later is fitted to the filler pipe slit portion bottom portion 42a.

Since the filler pipe slit portion 42 is formed, the filler pipe slit portion 42 expands or contracts to lower the rigidity of the filler pipe tip portion 41, and the filler pipe tip portion 41 is filled with a filler pipe mounting cylinder of the filler pipe mounting member 20 described later. It is easy to attach to the part 21.

As shown in FIG. 8A, a filler pipe first flange portion 44 bent in the outer peripheral direction can be formed on the distal end side of the filler pipe distal end portion 41. Moreover, the filler pipe 2nd flange part 45 bent in the outer peripheral direction can be formed in the filler pipe main-body part 43 side of the part close | similar to the bottom part of the filler pipe slit part 42 formed in the filler pipe front-end | tip part 41. FIG.

Since the filler pipe first flange portion 44 is formed at the filler pipe distal end portion 41, when the filler pipe 40 is pulled from the filler pipe mounting cylinder portion 21 of the filler pipe mounting member 20, a pipe band which will be described later on the filler pipe first flange portion 44. 60 is caught and the filler pipe 40 cannot be easily pulled out.

Further, the filler pipe second flange portion 45 is bent when the filler pipe second flange portion 45 is bent when the filler pipe distal end portion 41 is inserted into the filler pipe attachment cylinder portion 21 of the filler pipe attachment member 20. Can be opened easily. Further, the pipe band 60 can be positioned by preventing the pipe band 60 from being displaced by the filler pipe second flange portion 45.
As shown in FIG.8 (b), the filler pipe 2nd flange part 45 is dented inside and is formed thinly. For this reason, the filler pipe slit part 42 is easy to open.

Next, the filler pipe mounting member 20 will be described with reference to FIGS. 1 and 2.
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 are passed in the center, and is provided below the outer periphery of the lower surface (the surface facing the mounting flange portion 23) ( A mounting flange portion distal end portion 24 protruding in a ring shape is formed in the tank inner cylinder portion 22 side). 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 with reference to FIGS.
As shown in FIG. 1, the sealing member 30 includes a cylindrical sealing member cylindrical portion 31 positioned between a filler pipe mounting cylindrical portion 21 of the filler pipe mounting member 20 and a filler pipe distal end portion 41 of the filler pipe 40. And a seal member outer peripheral protrusion 32 protruding outward is formed on the outer periphery of the seal member cylindrical portion 31.

The seal member outer peripheral protrusion 32 is formed so as to extend in the axial direction (vertical direction in FIG. 5) of the seal member 30, and the seal member outer peripheral protrusion 32 is fitted into the filler pipe slit portion 42 as described above. Therefore, it is formed on the inlet side (lower side in FIG. 5) of the filler pipe tip 41.

Further, in the present embodiment, the seal member outer peripheral protrusion 32 is formed uniformly at 90 degrees apart at four positions on the outer periphery of the seal member cylindrical portion 31, but the outer diameter of the filler pipe tip 41 and The same number is formed according to the number of filler pipe slits 42 formed in the filler pipe 40 according to the rigidity of the filler pipe tip 41.

Moreover, as shown in FIG. 10, the seal member outer periphery protrusion 32 can be provided with a seal member outer periphery protrusion slit 32a extending in the outer surface axial direction. In this case, when the rigidity of the seal member outer peripheral protrusion 32 is lowered to make it easier to bend and the seal member outer peripheral protrusion 32 and the filler pipe tip 41 are tightened with a pipe band 60 described later, the seal member outer peripheral protrusion 32. Is bent and it is easy to tighten the pipe band 60.

A seal member inner peripheral protrusion 33 protruding over the entire periphery can be provided on the inner peripheral side of the seal member cylindrical portion 31. In this case, as shown in FIG. 1, when the seal member 30 is inserted, the seal member inner circumferential protrusion 33 is formed on the filler pipe attachment cylinder portion 21 of the filler pipe attachment cylinder portion 21 of the filler pipe attachment member 20. Abutting on the outer peripheral surface, the seal member 30 can be strongly held by the filler pipe mounting cylinder portion 21 to improve the sealing performance, and the seal member 30 can be made difficult to come off.

The tip of the seal member cylindrical portion 31 opposite to the side where the seal member outer peripheral projection 32 is formed is formed with a seal member tip 34 formed in a tapered shape. The seal member tip 34 facilitates the insertion of the seal member 30 into the filler pipe tip 41.
At the tip of the seal member tubular portion 31 on the side where the seal member outer peripheral protrusion 32 is formed, a seal member root protrusion 35 protruding in the outer peripheral direction is formed. When the seal member 30 is inserted into the filler pipe tip 41, the seal member base projection 35 can abut against the end surface of the filler pipe tip 41 to serve as a stopper.

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. 1-2, the attachment structure which attached the filler pipe front-end | tip part 41 to the filler pipe attachment member 20 is demonstrated.
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, and the attachment flange portion distal end portion 24 of the filler pipe attachment member 20 is welded to the attachment member holding flange 12 of the pipe attachment portion 10. Has been.

  Next, as shown in FIG. 1, the sealing member cylindrical portion 31 of the sealing member 30 is inserted into the filler pipe tip portion 41 of the filler pipe 40. At that time, the seal member outer peripheral projection 32 is fitted to the filler pipe slit bottom portion 42 a of the filler pipe slit portion 42 and is in close contact with the tip of the filler pipe tip 41.

At that time, as shown in FIG. 9, a filler pipe slit clearance 42 b which is a gap is generated between the seal member outer peripheral protrusion 32 and the filler pipe slit 42.
That is, the width (indicated by Y in FIG. 3) of the filler pipe slit portion 42 is wider than the width of the sealing member outer peripheral protrusion 32 (indicated by X in FIG. 9).

Next, the seal member 30 and the filler pipe distal end portion 41 are inserted into the filler pipe mounting cylinder portion 21 of the filler pipe mounting member 20. The inner surface of the seal member cylindrical portion 31 is in contact with the filler pipe mounting cylinder portion 21, the seal member outer peripheral protrusion 32 is fitted into the filler pipe slit portion 42, and the outer surface of the seal member outer peripheral protrusion 32 is a filler. It slightly protrudes from the outer surface of the pipe slit portion 42.

  Next, the seal member outer peripheral protrusion 32 and the filler pipe tip 41 are fastened by the pipe band 60 to attach the filler pipe tip 41. When the seal member outer peripheral protrusion 32 and the filler pipe tip 41 are tightened with the pipe band 60, the seal member outer peripheral protrusion 32 is bent and it is easy to tighten the pipe band 60.

In this case, since there is a filler pipe slit clearance 42b, the seal member outer peripheral projection 32 bends, and the filler pipe tip 41 and the seal member 30 are firmly attached to the filler pipe attachment member 20, and the seal member 30 is It can be strongly clamped 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.

Furthermore, as shown in FIG. 1, when the filler pipe mounting cylinder part ridge 21 a is provided on the filler pipe mounting member 20, the filler pipe mounting cylinder part ridge 21 a is pressed against the seal member cylindrical part 31. Sealing performance can be improved. When the seal member inner circumferential protrusion 33 is provided on the seal member cylindrical portion 31, the seal member inner circumferential protrusion 33 can be further in close contact with the filler pipe mounting cylinder portion 21 to further improve the sealing performance. it can.
In addition, as shown in FIG. 2, the pipe band 60 directly clamps the filler pipe tip 41 in a portion where the filler pipe slit 42 and the seal member outer peripheral protrusion 32 are not provided.

As shown in FIG. 8, when the filler pipe first flange portion 44 and the filler pipe second flange portion 45 are provided at the filler pipe tip portion 41, the filler pipe first flange portion 44 and the filler pipe second flange portion 45 are provided. The pipe band 60 can be tightened between them, and the pipe band 60 is difficult to come off from the filler pipe tip 41.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Tank outer wall 20 Filler pipe attachment member 21 Filler pipe attachment cylinder part 30 Seal member 31 Seal member cylindrical part 32 Seal member outer periphery protrusion 40 Filler pipe 41 Filler pipe front-end | tip part 42 Filler pipe slit part 60 Pipe band

Claims (8)

In the pipe mounting structure that attaches the pipe 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;
The tip of the pipe forms a pipe tip attached to the pipe mounting cylinder, the pipe tip is formed with a pipe slit extending in the axial direction from the tip,
A seal member is provided between the pipe attachment member and the pipe tip, and the seal member has a seal tubular portion located between the pipe attachment member and the pipe tip, and the seal tube A seal member outer peripheral protrusion that fits into the pipe slit is formed on the outer periphery of the shape part,
In a state where the seal member is inserted into the pipe mounting cylinder portion of the pipe mounting member, the pipe slit of the pipe tip portion is fitted to the seal member outer peripheral projection of the seal member, and the pipe tip portion is A pipe attachment structure, wherein the pipe is attached to the pipe attachment member via a seal member, and the pipe is attached by tightening the outer peripheral protrusion of the seal member and the tip of the pipe with a pipe band. 2. The pipe according to claim 1, wherein a gap extending in an axial direction is provided between the seal member outer peripheral protrusion and the pipe slit when the pipe slit at the tip of the pipe is fitted to the seal member outer peripheral protrusion. Mounting structure. The pipe mounting structure according to claim 1 or 2, wherein a ridge that protrudes circumferentially in the outer circumferential direction is formed at a tip of the pipe tip. The pipe mounting structure according to any one of claims 1 to 3, wherein a ridge that protrudes circumferentially in the outer peripheral direction is formed on a pipe main body side of a portion adjacent to the pipe slit at the tip of the pipe. . The pipe attachment structure according to any one of claims 1 to 4, wherein a slit extending in an axial direction is provided on an outer peripheral surface of the outer peripheral protrusion of the seal member. The pipe mounting structure according to any one of claims 1 to 5, further comprising a seal member inner peripheral protrusion projecting toward an inner peripheral side of the seal member. The pipe attachment structure according to any one of claims 1 to 6, wherein the seal member is made of synthetic rubber. The pipe mounting structure according to any one of claims 1 to 7, wherein the hollow member is an automobile fuel tank, and the pipe is a filler pipe that supplies fuel to the automobile fuel tank.

Images