JP4905005B2 - Member joining structure to fuel tank, fuel tank manufacturing method, and member joining method to fuel tank - Google Patents

Description

  The present invention relates to a member joining structure to a fuel tank, a fuel tank manufacturing method, and a member joining method to a fuel tank.

  Some fuel tanks provided in vehicles such as automobiles are made of resin. For example, in Patent Document 1, an opening of a fuel tank formed of a resin member has a cylindrical portion, a bent portion extending in a direction of expanding the opening from the tip of the cylindrical portion, and an opening portion. An opening structure of a fuel tank in which an overlapping portion having an outer surface parallel to the opening surface is formed is described. Furthermore, a compression part is formed in a part of the overlapping part, a recess is formed in a part corresponding to the compression part, and a part of the resin material is introduced into the recess to integrally couple the annular member to the opening. I am doing so. In the structure of Patent Document 1, the compression portion becomes a resistance when fuel permeates, and permeation is prevented.

By the way, although other members may be attached to the fuel tank main body, a structure for effectively suppressing the permeation of fuel in such a member joining structure is not disclosed.
JP 2003-54268 A

  In consideration of the above facts, the present invention provides a member joining structure to a fuel tank capable of improving fuel resistance at a portion to which another member is attached, a method of manufacturing the fuel tank constituting the member joining structure, and It is an object to obtain a method for joining a member to a fuel tank.

In the first aspect of the present invention, a fuel tank body comprising a resin tank and a fuel tank structure comprising a resin layer and a barrier layer laminated with the resin layer by a material having lower fuel permeability than the resin layer. A folded portion formed by partially folding the barrier layer, a thin portion in which the resin layer is locally thinned above the folded portion, and the fuel tank body welded to the thin portion from above A joining member joined to the welding seat, a welding seat surface in which a portion welded to the joining member in the thin-walled portion is formed flat, and a fuel tank structure from the opposite side of the joining member welded to the welding seat surface And a supporting member for supporting .

In the present invention, the barrier layer of the fuel tank structure constituting the fuel tank main body is partially folded to form a folded portion, and a thin portion having a thin resin layer locally is provided above the folded portion. Yes. A joining member is welded to the thin portion from above and joined to the fuel tank body. In the thin portion, the cross-sectional area through which the fuel permeates is small, and the fuel permeation resistance is high. In other words, since the joining member is welded and joined to the portion having high fuel permeability, it is possible to improve the fuel permeability at the thin portion.
Moreover, since the contact surface that contacts the joining member is a flat formed welding seat surface in the thin wall portion, the contact property at the time of welding is increased, and strong welding becomes possible.
Furthermore, by supporting the fuel tank structure from the opposite side of the welding seat surface by the support member, the joining member can be strongly pressed against the welding seat surface at the time of welding, and strong welding becomes possible.

According to a second aspect of the present invention, in the first aspect of the invention, the joining member includes a joining member main body and a barrier material made of a material having lower fuel permeability than the joining member main body. And the barrier material is in contact with the thin portion at a position sandwiching the thin portion with the barrier layer .

As a result, the barrier layer of the fuel tank structure and the barrier material of the joining member sandwich the thin-walled portion, and the barrier layer and the barrier material come close to each other. Becomes smaller and the fuel permeation resistance becomes higher.

  Even when the thin portion is formed by a mold or the like, for example, the thin portion can be easily formed by compressing the fuel tank structure with the support member and the mold.

In the invention described in claim 3, in the invention of claim 1 or claim 2, pre-Symbol support member, a convex portion, which projects toward the fuel tank structure at a position where the folded portion is present It is characterized by having.

  Therefore, at the position where the folded portion where the barrier layer is folded is present, a thin-walled portion is formed on the welding seat surface side, and the fuel tank structure is projected from the opposite surface, that is, the surface side supported by the support member. It is pushed to make it thin. Thereby, since a thin part can be made still thinner, fuel-permeation resistance becomes higher.

In the invention according to claim 4 , in the invention according to claim 3 , the support member has a recess that is locally recessed so as to be separated from the welding seat surface in the vicinity of the protrusion. The fuel tank structure is characterized in that a thick-walled portion formed by the resin layer entering the concave portion is formed, and the joining member is welded to the thick-walled portion.

  Therefore, when the thin portion is formed by compressing with a mold and a support member, for example, the resin layer of the fuel tank constituting body can move to the concave portion, so that molding becomes easy.

  Further, by welding the joining member to the thick portion where the resin layer has entered into the concave portion and thickened, a higher welding strength can be obtained as compared with the configuration in which welding is performed at a portion other than the thick portion.

  The “near the convex portion” may be a position where the resin moves and enters when the thin portion is compressed as described above.

In the invention described in claim 5 is the invention according to any one of claims 1 to 4, a support surface for supporting the fuel tank structure of the support member, the fuel than the weld bearing surface The position is on the tank body side.

  Therefore, when the joining member is welded to the welding seat surface, the support member does not interfere with the welding apparatus, and the weldability is improved. For example, when the heating device is used, the heating device does not interfere with the support member, so that uniform heating is possible.

In the invention described in claim 6, in the state A manufacturing method of a fuel tank which constitutes the structure for joining members to the fuel tank according to claim 1, which supports the fuel tank structure with the support member, the support The thin-walled portion is formed by compressing the fuel tank structure from the opposite side of the member.

  That is, since the fuel tank structural body is supported by the support member and the fuel tank structural body is compressed from the opposite side, the thin portion can be formed easily and reliably.

The invention according to claim 7, a method for manufacturing a fuel tank which constitutes the structure for joining members to the fuel tank according to claim 1, the applying process in the fuel tank body of the supporting member as a position reference Features.

  Since the fuel tank body can be processed using the support member as a position reference, more accurate processing is possible.

In the state In the invention described in claim 8, a member joining method of the fuel tank which constitutes the structure for joining members to the fuel tank according to claim 1, which supports the fuel tank structure with the support member The joining member is brought into contact with and welded to the thin portion from the opposite side of the support member.

That is, since the fuel tank constituent body is supported by the support member and the joining member is welded to the thin portion from the opposite side, stronger joining is possible.

According to a ninth aspect of the present invention, there is provided a member joining method to the fuel tank constituting the member joining structure to the fuel tank according to the fifth aspect, wherein the welding seat surface is heated by a heating device and the joining member is heated. It is characterized by welding.

  Therefore, when the welding seat surface is heated using the heating device, the heating device does not interfere with the support member, so that uniform heating is possible.

  Since the present invention has the above-described configuration, it is possible to improve the fuel permeation resistance of the portion from the mating portion where the fuel tank components are overlapped to the through hole.

  FIG. 1 partially shows a fuel tank 12 to which a member joining structure (hereinafter simply referred to as “member joining structure”) 18 to a fuel tank according to a first embodiment of the present invention is applied. As an example, the fuel tank 12 according to the present embodiment includes a fuel tank main body 14 having a substantially rectangular parallelepiped shape and a fuel tank structure 16.

  The fuel tank structure 16 includes two resin layers 22A and 22C made of, for example, high-density polyethylene (HDPE), and a barrier layer 24A between the resin layers 22A and 22C, which are adhered by an adhesive layer (not shown). It is configured. The barrier layer 24A is made of, for example, EVOH (ethylene vinyl alcohol) or the like, which has a lower fuel permeability than the resin layers 22A and 22C (it is difficult for fuel to permeate).

  As shown in detail in FIG. 2, an insertion hole 36 into which the fuel tank component 32 is inserted is formed in the top surface 14 </ b> T of the fuel tank main body 14, and the fuel tank structure is formed around the insertion hole 36. A joint portion 20 to which the body 16 is joined is configured. By joining the fuel tank component 32 to the joint 20, the member joint structure 18 of the present embodiment is obtained.

  Around the insertion hole 36, the fuel tank component 16 is once bent upward and further bent in a direction away from the fuel tank component 32 to form a neck portion 38. Further, from the front end of the outer periphery of the neck portion 38, the fuel tank component 16 is folded back in a direction approaching the fuel tank component 32 (center direction to the insertion hole 36), and an annular flange portion 40 is formed. In addition, a folded portion 26 is formed in the barrier layer 24A. The upper and lower resin layers 22A of the folded portion 26 are the outer layer portion 28 in the present invention.

  In the flange portion 40, the barrier layer 24A and the upper and lower resin layers 22A, 22C are flat, and the upper surface of the flange portion 40 is a flat welding seat surface 30 on which the fuel tank component 32 is welded. Yes.

An annular insert ring 42 is disposed outside the neck portion 38. As will be described later, the insert ring 42 is inserted into the mold when the fuel tank body 14 is blow-molded. The upper end on the inner peripheral side of the insert ring 42 is a support surface 44 that supports the fuel tank constituting body 16 during compression molding, which will be described later, and is positioned below the welding seat surface 30.

  The insert ring 42 has an inner convex portion 46 projecting (upward) toward the flange portion 40 on the radially inner side, an outer convex portion 48 projecting upward on the radially outer side, and the inner convex portion 46 and the outer portion. A recess 50 formed between the protrusions 48 is provided. The shape of the flange portion 40 is determined so that the fuel tank constituting body 16 constituting the flange portion 40 exists above the inner convex portion 46 and the concave portion 50 but does not exist above the outer convex portion 48. It has been. Furthermore, although the barrier layer 24A exists at a position corresponding to the inner convex portion 46, the barrier layer 24A does not exist at a position corresponding to the concave portion 50, and only the resin layers 22A and 22C exist.

  Further, the flange portion 40 is locally thinned at a portion corresponding to the inner convex portion 46 of the insert ring 42, and in particular, a thin portion 52 is formed in which the resin layers 22A and 22C are thinned. On the other hand, the resin layers 22 </ b> A and 22 </ b> C enter the recess 50 to be thick at the portion corresponding to the recess 50 of the insert ring 42, thereby forming the thick portion 54. That is, in the flange portion 40, the resin layers 22A and 22C are thin in the portion where the folded portion 26 of the barrier layer 24A exists, and the resin layers 22A and 22C are thick in the portion where the barrier layer 24A does not exist. become.

  A through hole 56 is formed in the outer convex portion 48 of the insert ring 42 so as to penetrate between the outer peripheral surface and the concave portion 50. As shown in FIG. 3, a plurality of through holes 56 are formed at regular intervals along the circumferential direction of the insert ring 42. A part of the resin constituting the resin layers 22A and 22C enters the through hole 56 from the concave portion 50 side, so that the insert ring 42 is securely fixed around the neck portion 38, and may be inadvertently lifted up. It is designed not to rotate.

  As shown in FIG. 2, the fuel tank component 32 includes a barrier material 58B and a welding material 58A. The barrier material 58B is made of a material with low fuel permeability (for example, it is difficult for fuel to permeate) such as PA, and closes the cylindrical cylindrical portion 60 and one end (upper end) of the cylindrical portion 60 and has a diameter. And a closed disc portion 62 projecting outward in the direction. The welding material 58A is made of a material having high weldability to the resin layers 22A and 22C, such as modified PE, for example, and a circular portion 64 that comes into surface contact with the closing disc portion 62 from above, and a closing disc portion. And a welding portion 66 extending downward from the outside of 62.

  In the state where the cylindrical portion 60 is inserted into the insertion hole 36, the lower surface (welding surface) of the welding portion 66 and the welding seat surface 30 are brought into contact with each other at the position of the thick portion 54. At this time, the barrier material 58B of the fuel tank component 32 and the barrier layer 24A of the fuel tank component are also positioned corresponding to each other in the folded portion 26 of the barrier layer 24A, and overlap each other when viewed from above.

  Next, the method of forming the joint 20 (fuel tank manufacturing method), the member joining method of joining the fuel tank components 32 to form the member joining structure 18, and the operation of the member joining structure 18 of the present embodiment will be described. explain.

  In order to form the joint portion 20, first, the joint portion 20 is formed on the fuel tank body 14 having the flat top surface 14T without forming the insertion hole 36, as shown in FIG. The insert ring 42 is arranged at a position (position where the insertion hole 36 is formed) and set in the molding apparatus. This molding apparatus has a die 72 on the outer peripheral side of the joint portion 20 and a die 74 on the outer side (upper side) of the joint portion 20, so that the insert ring 42 can be set in the die 72. It has become. Further, the mold 74 moves in the vertical direction and comes into contact with and separates from the insert ring 42.

  At the time of blow molding, as shown in FIG. 4B, the mold 74 is moved in the direction of the arrow M1, and the neck portion is held while the fuel tank structure 16 is sandwiched between the insert ring 42 and the mold 74 in the thickness direction. 38 and the flange portion 40 are formed. At this time, a flat welding seat surface 30 is formed on the upper surface of the flange portion 40 by the die 74. In particular, by forming the fuel tank constituting body 16 between the insert ring 42 and the mold 74, a sufficient pressing force to the mold 74 can be obtained, so that a high flatness can be obtained as the welding seat surface 30.

  Further, when the mold 74 is brought closer to the insert ring 42, as shown in FIG. 4C, the thickness of the resin layer 22A is reduced at the portion corresponding to the inner convex portion 46 of the insert ring 42, and the thin portion 52 is formed. Is formed. At this time, the recess 50 of the insert ring 42 becomes a “flank” of the resin constituting the resin layer 22A. Further, the through-hole 56 of the insert ring 42 also acts as a “relief” of the resin constituting the resin layer 22A, and the resin enters. Therefore, the thin-walled portion 52 can be formed more effectively as compared with an insert ring without such a recess 50 or through-hole 56.

  And in the location corresponding to the recessed part 50, thickness of resin layer 22A becomes thick and the thick part 54 is formed. Further, the insert ring 42 is securely fixed around the neck portion 38 by the resin that has entered the through-hole 56, so that the resin does not inadvertently float or rotate.

  Thereafter, using a drilling tool (not shown), a hole is formed in the center of the flange portion 40 to form an insertion hole 36 (see FIG. 2). At the time of drilling, the insert ring 42 can be used as a position reference, so that it is not affected by the accuracy of blow molding, so that accurate position accuracy is obtained compared to drilling that does not use the insert ring 42 as a position reference. Thus, the insertion hole 36 can be made.

  Next, as shown in FIG. 4D, the fuel tank component 32 is welded to the welding seat surface 30. First, the fuel tank component 32 is held by the welding jig 76 having a hot plate, and the cylindrical portion 60 is inserted into the insertion hole 36. The welded portion 66 of the fuel tank component 32 contacts and is pressed against the welded seat surface 30, and the respective resins are melted and welded by heat. That is, the fuel tank component 32 is welded to the fuel tank main body 14 (welding seat surface 30) while being in contact with the thin portion 52 of the fuel tank main body 14. At this time, since the welding seat surface 30 has high flatness, high welding strength can be ensured.

  Since the position of the support surface 44 at the upper end of the insert ring 42 is located below the welding seat surface 30, the welding jig 76 (hot plate) does not interfere with the insert ring 42, and the welding seat surface 30 is reliably secured. And can be heated evenly.

  Further, at the time of welding, the insert ring 42 supports the fuel tank component 16 from the opposite side of the fuel tank component 32, and a sufficient reaction force against the pressing force of the fuel tank component 32 is obtained due to its rigidity. It is done. Therefore, the barrier material 58B of the fuel tank component 32 can be sufficiently pressed and welded to the barrier layer 24A of the flange portion 40 of the fuel tank main body 14 (particularly, the barrier layer 24A at the location of the thin portion 52). Further, the distance between the barrier material 58B and the barrier layer 24A is also stabilized.

  Further, the welded portion 66 of the fuel tank component 32 is welded by the thick portion 54 in the flange portion 40 of the fuel tank main body 14. That is, since the welding material 58A of the fuel tank component 32 and the resin layer 22A of the fuel tank main body 14 are sufficiently melted, the welding strength is higher than that in which such a thick portion 54 is not formed. can get.

  Even at the time of welding, it is possible to use the insert ring 42 as a position reference, which eliminates the influence of blow molding accuracy. Compared to welding that does not use the insert ring 42 as a position reference, Welding can be performed with accurate positional accuracy, and the wrap margin between the barrier material 58B and the barrier layer 24A is stabilized.

  In the member joining structure 18 of the present embodiment thus obtained, the fuel tank component 32 is welded in the thin portion 52 where the resin layer 22A is thin, and the barrier layer 24A and the barrier material 58B correspond to each other. That is, these distances are arranged close to each other. Since the materials that are difficult for the fuel to pass through are disposed close to each other, the substantial permeation cross-sectional area of the fuel when passing through the resin layer 22A on the upper side of the folded portion 26 from the insertion hole 36 side is reduced.

  Here, FIG. 5 shows the relationship between the permeation amount of the fuel (the cross-sectional area in the direction orthogonal to the permeation direction) and the permeation amount for the same material as the resin layer 22A. FIG. 5 shows that the smaller the permeation area of the fuel with respect to the material, the smaller the permeation amount. In the present embodiment, as described above, the fuel permeation cross-sectional area when passing through the resin layer 22A on the upper side of the folded portion 26 from the insertion hole 36 side is reduced, so that the amount of fuel permeation is reduced and the fuel resistance is increased. Improves permeability.

  When the fuel tank 12 is actually mounted on a vehicle and used, the top surface 14T of the fuel tank main body 14 may be deformed due to pressure increase / decrease with respect to the fuel tank 12. In the fuel tank 12 according to this embodiment, the rigidity of the insert ring 42 provided in the joint portion 20 is relatively higher than that of the fuel tank constituting body 16 and is not easily deformed. Since the stress acting on the joint 20 is reduced, the durability of the fuel tank 12 (particularly the joint 20) is improved.

  In addition, the fuel tank 12 may bend or deform due to swelling of the internal fuel in the resin layers 22A and 22C. In the fuel tank 12 according to the present embodiment, the deflection and deformation of the welded portion 66 are suppressed by the rigidity of the insert ring 42 provided in the joint portion 20 even with respect to the deflection and deformation caused by such swelling. Strength is improved.

  Furthermore, even when an external force acts on the fuel tank 12 and the top surface 14T of the fuel tank main body 14 is bent or deformed, the fuel tank 12 according to the present embodiment has the insert ring 42 of the joint portion 20 provided with the insert ring 42. The rigidity suppresses the bending and deformation of the welded portion 66 and improves the durability.

  FIG. 6 shows a member joining structure 78 according to the second embodiment of the present invention. In the second embodiment, the shape of the barrier material 84B of the fuel tank component 82 and the shape of the insert ring 86 are different from those in the first embodiment. Accordingly, in the joint portion 80, the shape of the flange portion 40 and the shape of the top surface 14T of the fuel tank body 14 are also partially different. In the following, only the parts different from the first embodiment will be described, and the same components, members and the like as those of the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  In the fuel tank component 82 of the second embodiment, a convex portion 88 protruding downward is formed on the lower surface of the barrier material 84B. The convex portion 88 is located at a position corresponding to the thin portion 52 of the flange portion 40 and is formed in an annular shape so as to be continuous in the circumferential direction.

  Therefore, in the second embodiment, the resin layer 22 </ b> A constituting the thin portion 52 is further thinned locally at the convex portion 88.

  Further, the insert ring 86 of the second embodiment has an inner convex portion 46, an outer convex portion 48 and a concave portion 50 similar to the insert ring 42 of the first embodiment, but further downward from the radially outer side. On the other hand, a lower convex portion 90 is formed. In addition, from the lower end of the lower convex part 90, the outward convex part 92 which goes to a radial direction outer side is formed. The top surface 14T of the fuel tank main body 14 is displaced downward in a predetermined manner by the lower convex portion 90, and a second thin portion 94 in which the thickness of the resin layer 22A is locally reduced is formed at this portion. Yes.

  Further, a part of the resin constituting the resin layer 22 </ b> A also wraps around the upper side of the outward projection 92. Thereby, the insert ring 86 is firmly fixed by the fuel tank main body 14 compared with 1st Embodiment.

  In the second embodiment, the method for forming the joint 80 and the method for joining the fuel tank component 82 to the joint 80 are substantially the same as those in the first embodiment.

  That is, first, the insert ring 86 is disposed at a position where the joint 80 is formed with respect to the fuel tank main body 14 having the flat top surface 14T, and is set in the molding apparatus.

  Then, as shown in FIGS. 8A to 8B, at the time of blow molding, the mold 74 is moved in the direction of the arrow M1 and is sandwiched between the insert ring 86 and the mold 74, and the neck portion 38 and the flange portion 40. Is molded. At this time, the welding seat surface 30 having high flatness is formed on the upper surface of the flange portion 40 by the mold 74.

  When the mold 74 is further moved closer to the insert ring 86, the thin portion 52 is formed at a location corresponding to the inner convex portion 46 of the insert ring 86 as shown in FIG. At this time, the recess 50 and the through-hole 56 of the insert ring 42 act as “rescue” of the resin, the resin enters, and the thin portion 52 can be effectively formed.

  In addition, a thick portion 54 is formed at a location corresponding to the recess 50. The insert ring 42 is reliably fixed around the neck portion 38 by the resin that has entered the through hole 56. At the time of this blow molding, the second thin portion 94 is formed by the lower convex portion 90 in the second embodiment. In addition, a part of the resin of the resin layer 22 </ b> A goes around to the upper side of the outward projection 92.

  Thereafter, using an unillustrated drilling tool, a hole is formed in the center of the flange portion 40 to form the insertion hole 36. By using the insert ring 42 as a position reference, the insertion hole 36 can be formed with accurate positional accuracy.

  Next, as shown in FIG. 8D, the fuel tank component 32 is held by the welding jig 76 having a hot plate, and the fuel tank component 32 is welded while the cylindrical portion 60 is inserted into the insertion hole 36. The part 66 is pressed against the welding seating surface 30 to melt and melt each other resin by heat. At this time, the resin layer 22 </ b> A constituting the thin portion 52 is further locally thinned by the convex portion 88 of the barrier material 84 </ b> B.

  As in the first embodiment, by using the insert ring 42 as a position reference even during welding, welding can be performed with accurate positional accuracy, and the lapping allowance between the barrier material 58B and the barrier layer 24A is stabilized.

  Also in the member joining structure 78 of the second embodiment obtained in this way, as in the first embodiment, the fuel tank component 32 is welded to the thin portion 52, and the barrier layer 24A and the barrier material 58B are Therefore, the substantial permeation cross-sectional area of the fuel when passing through the resin layer 22A on the upper side of the folded portion 26 from the insertion hole 36 side is reduced, and the fuel permeation resistance is improved.

  Furthermore, in the second embodiment, the resin layer 22 </ b> A of the thin portion 52 is locally thinned by the convex portion 88. Therefore, the substantial permeation cross-sectional area of the fuel in this portion is further reduced than in the first embodiment, and the fuel permeation resistance is improved.

  Further, in the second embodiment, since the second thin portion 94 is formed by the lower convex portion 90 of the insert ring 86, the substantial permeation cross-sectional area of the fuel is reduced also in this portion, and the fuel permeation resistance Has improved.

  In addition, in the second embodiment, since the resin of the resin layer 22A also wraps around the outward convex portion 92 of the insert ring 86, the insert ring 86 can be fixed to the fuel tank body 14 more firmly. When an external force acts on the fuel tank component 82, the load on the joint 80 is transmitted to the top surface 14 </ b> T of the fuel tank body 14 through the insert ring 86. As a result, the fuel permeation resistance can be maintained high while ensuring high bonding strength of the fuel tank component 82 to the fuel tank body 14.

  In each of the above embodiments, the thin portion 52 formed by compressing the resin is described as the thin portion of the present invention. However, the method for forming the thin portion is not limited to compression. For example, the thin portion may be formed by locally cutting the flange portion 40.

It is sectional drawing which shows partially the fuel tank to which the member joining structure to the fuel tank of 1st Embodiment of this invention was applied. It is sectional drawing which expands and shows the fuel tank to which the member joining structure to the fuel tank of 1st Embodiment of this invention was applied in the vicinity of the junction part. It is explanatory drawing shown in the state which looked at the fuel tank to which the member joining structure to the fuel tank of 1st Embodiment of this invention was applied in the arrow A direction of FIG. It is explanatory drawing which shows the process of forming a junction part in a fuel tank main body in 1st Embodiment of this invention, and the process of joining a fuel tank structural component to (A)-(D) in order. It is a graph which shows qualitatively the relation between permeation area and permeation amount when fuel permeates a resin material. It is sectional drawing which expands and shows the fuel tank to which the member joining structure to the fuel tank of 2nd Embodiment of this invention was applied in the vicinity of a junction part. It is explanatory drawing shown in the state which looked at the fuel tank to which the member joining structure to the fuel tank of 2nd Embodiment of this invention was applied in the arrow B direction of FIG. It is explanatory drawing which shows the process of forming a junction part in a fuel tank main body in 2nd Embodiment of this invention, and the process of joining a fuel tank structural component to (A)-(D) in order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Fuel tank 14 Fuel tank main body 14T Top surface 16 Fuel tank structure 18 Member joint structure 20 Joint part 22A Resin layer 24A Barrier layer 26 Folding part 28 Outer layer part 30 Welding seat surface 32 Fuel tank component (joint member)
36 Insertion hole 38 Neck 40 Flange 42 Insert ring (support member)
44 Support surface 46 Inner convex part (convex part)
48 Outer convex part 50 Concave part 52 Thin part 54 Thick part 56 Through-hole 58A Welding material (joining member main body)
58B Barrier material 60 Cylindrical part 62 Closed disk part 64 Circular part 66 Welding part 72 Mold 74 Mold 76 Welding jig 78 Member joining structure 80 Joining part 82 Fuel tank component 84B Barrier material 86 Insert ring 88 Protruding part 90 Below Side convex part 92 Outward convex part 94 Second thin part

Claims (9)

A fuel tank body comprising a resin tank and a fuel tank assembly comprising a resin layer and a barrier layer laminated with a resin layer having a lower fuel permeability than the resin layer;
A folded portion formed by partially folding the barrier layer;
A thin portion where the resin layer is locally thin on the upper side of the folded portion; and
A joining member that is welded to the thin-walled portion from above and joined to the fuel tank body;
A welding seating surface in which a portion welded to the joining member in the thin-walled portion is formed flat;
A support member for supporting the fuel tank structure from the opposite side of the joining member welded to the welding seat surface;
A structure for joining a member to a fuel tank, comprising: The joining member is
A joining member body, and a barrier material made of a material having lower fuel permeability than the joining member body;
With
The member joining structure to the fuel tank according to claim 1, wherein the barrier material is in contact with the thin portion at a position sandwiching the thin portion with the barrier layer. The support member is
A convex portion projecting toward the fuel tank structure at a position where the folded portion exists,
The member joining structure to the fuel tank according to claim 1 or 2 , characterized by comprising : The support member is
A concave portion locally recessed so as to be separated from the welding seating surface in the vicinity of the convex portion,
Have
The fuel tank structure is formed with a thick portion that is thickened by the resin layer entering the recess,
The member joining structure to the fuel tank according to claim 3 , wherein the joining member is welded in the thick portion. 5. The fuel tank body according to claim 1 , wherein a support surface of the support member that supports the fuel tank constituting body is positioned on the fuel tank main body side with respect to the welding seat surface. The member joining structure to the described fuel tank. A method of manufacturing a fuel tank constituting the structure for joining a member to a fuel tank according to claim 1 ,
The method for manufacturing a fuel tank, wherein the thin portion is formed by compressing the fuel tank structure from the opposite side of the support member in a state where the fuel tank structure is supported by the support member. A method of manufacturing a fuel tank constituting the structure for joining a member to a fuel tank according to claim 1 ,
A method of manufacturing a fuel tank, wherein the fuel tank body is processed using the support member as a position reference. A member joining method to a fuel tank constituting the member joining structure to the fuel tank according to claim 1 ,
A member joining method to a fuel tank, wherein the joining member is brought into contact with and welded to the thin portion from the opposite side of the supporting member in a state where the fuel tank constituting body is supported by the supporting member. A member joining method to a fuel tank constituting a member joining structure to a fuel tank according to claim 5 ,
A member joining method to a fuel tank, wherein the welding seat surface is heated by a heating device to weld the joining member.

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