JP6219131B2 - Wave plate fixing structure in fuel tank - Google Patents

Description

  The present invention relates to a wave canceling plate fixing structure in a fuel tank for fixing a wave canceling plate for suppressing undulation of fuel.

  2. Description of the Related Art There is a known structure in which a waving plate is fixed in a resin fuel tank mounted on an automobile or the like to suppress undulation of fuel by suppressing undulation of fuel. As a technique for realizing this structure, for example, there is one described in Patent Document 1. In this technique, a plate having a plurality of through holes is formed, and a wave-dissipating plate (a partition plate in Patent Document 1) having mounting portions protruding to one side at both ends of the plate is fixed in the fuel tank. doing. The wave-dissipating plate is a projecting portion that is erected in an opposed state in the fuel tank from above and below, and is fixed by sandwiching attachment portions at both ends from above and below. The protrusions reinforce the strength of the fuel tank in the opposing direction by being abutted against each other via a wave-eliminating plate.

JP 2007-237843 A

  By the way, in the technology of Patent Document 1, since the upper and lower protrusions are merely abutted across the wave vane plate in the fuel tank, when the pressure inside the fuel tank becomes positive due to the vaporization and expansion of the fuel, The bottom surface of the fuel tank and the top surface are easily deformed in a direction away from each other. When the fuel tank is deformed, there is a problem that the wave-dissipating plate is loosely held by the upper and lower protrusions and the wave-dissipating plate is detached from the fuel tank.

  The present invention was created to solve such problems, and provides a wave plate fixing structure in a fuel tank that can improve the deformation resistance of the fuel tank and can firmly fix the wave plate. The purpose is to do.

In order to solve the above problems, the wave-removal fixing structure in the fuel tank according to the present invention includes a columnar portion connected to opposing inner walls of a resin fuel tank, a main body portion that suppresses undulation of fuel, and A wave-dissipating plate having a thin-walled portion and a mounting portion having a thick-walled portion provided at the end portion, and the columnar portion is configured by projecting projecting portions projecting from the opposed inner walls to each other. cage, and a slit is provided across the thick portion of the periphery of the thin portion and the thin portion with penetrating in a thickness direction of the thick portion of the wave off plate, the thin of the wave off plate The part is sandwiched between the projecting parts and welded to the tip of the projecting part, and the resin of the columnar part enters the slit .

  According to this configuration, the inner walls facing each other of the fuel tank are connected by the columnar portion, so that the deformation resistance and strength of the fuel tank can be improved. Moreover, since the wave-dissipating plate is welded while being sandwiched between the pair of projecting portions constituting the columnar part, the wave-dissipating plate can be firmly fixed.

  According to this configuration, since the thin portion is easily melted, the protruding portion and the wave extinguishing plate can be easily welded.

According to such a configuration, when molding against a projection of one another, between resins melted through the slits is welded directly. Thereby, while the intensity | strength of a columnar part improves more, a wave-cancelling board can be fixed more firmly.

  According to the wave plate fixing structure in the fuel tank according to the present invention, it is possible to enhance the deformation resistance of the fuel tank and firmly fix the wave plate.

1 shows a wave-cancelling plate fixing structure in a fuel tank according to an embodiment of the present invention, wherein (a) is a perspective view showing the appearance of the fuel tank, and (b) is a cross-sectional view taken along line AA of the fuel tank shown in (a). . (A) is a perspective view which shows the structure of the wave-dissipating plate of this embodiment, (b) is BB sectional drawing of the attachment part of the wave-dissipating plate shown to (a). (A) The figure which shows the state which suspended the parison when manufacturing the fuel tank by fixing the wave-dissipating board of this embodiment inside, (b) The figure which shows the state which has arrange | positioned the wave-dissipating board to a parison. . (A) The figure which shows the state pressed by the protrusion molding part from the both sides of the parison which pinched | interposed the wave-dissipating board, (b) The figure which shows the state which obstruct | occluded the upper-lower end side of a parison. (A) The figure which shows the state which performed pre blow at the time of fuel tank shaping | molding, (b) The figure which shows the state which formed the fuel tank molded article by blow molding. (A) is a perspective view which shows the structure of the wave-extinguishing board of the modification 1 of this embodiment, (b) is CC sectional drawing of the attachment part of the wave-extinguishing board shown to (a). It is a schematic cross section at the time of fixing the wave-dissipating plate of the modification 1 in a fuel tank. (A) is a perspective view which shows the structure at the time of providing a slit in the wave-extinguishing board of the modification 1, (b) is DD sectional drawing of the attaching part of the wave-extinguishing board shown to (a). (A) is a perspective view which shows the structure of the wave-extinguishing board of the modification 2 of this embodiment, (b) is EE sectional drawing of the attaching part of the wave-extinguishing board shown to (a). (A) is a perspective view which shows the structure of the wave-extinguishing board of the modification 3 of this embodiment, (b) is FF sectional drawing of the attaching part of the wave-extinguishing board shown to (a).

Embodiments of the present invention will be described below with reference to the drawings.
<Configuration of Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. A fuel tank 1 shown in FIG. 1A is made of resin, stores fuel such as gasoline therein, and is mounted on moving means such as an automobile, a motorcycle, and a ship. The fuel tank 1 is a type that is wide and thin in the vertical direction. The fuel tank 1 is formed of a thermoplastic resin including a barrier layer.

  FIG.1 (b) is AA sectional drawing of the fuel tank 1 shown to (a). As shown in FIG. 1 (b), the fuel tank 1 has a columnar portion 2 composed of projecting portions 2a and 2b that project in the opposite direction from the upper and lower surfaces (top surface and bottom surface) in the fuel tank 1. Two are provided.

  The two columnar portions 2 are arranged at a predetermined interval in the longitudinal direction of the fuel tank 1. Each columnar portion 2 is connected to the lower surface and the upper surface, thereby improving the deformation resistance and strength of the fuel tank 1. A pump mounting hole 3 for mounting a pump (not shown) for pumping fuel out of the fuel tank 1 is formed through the upper surface of the fuel tank 1.

  In the wave canceling plate fixing structure 10 in the fuel tank 1, the wave canceling plate 20 is fixed by the two columnar portions 2 connected to the upper and lower surfaces in the fuel tank 1. In other words, the wave-dissipating plate fixing structure 10 sandwiches the wave-dissipating plate 20 with the protruding portions 2a and 2b protruding from the upper and lower surfaces constituting the columnar portion 2, and the tips of the protruding portions 2a and 2b to the wave-dissipating plate 20. It is welded and fixed.

  The wave canceling plate 20 is a plate-like member that suppresses the ripple of fuel in the fuel tank 1. As shown in FIG. 2A, the wave-dissipating plate 20 protrudes on one side at both ends in the longitudinal direction of the long plate-like main body portion 21 in which a plurality of through holes 21a are formed. It has plate-shaped attachment portions 22 and 22.

  The main body portion 21 and each attachment portion 22 are formed of a resin material. The resin material of the mounting portion 22 may be any material as long as it can be welded to the projecting portions 2a and 2b of the fuel tank 1 as will be described later. In this embodiment, the same material as that of the fuel tank 1 is used. .

  Each attachment portion 22 is formed at both ends of the main body portion 21 so that the surface of the main body portion 21 and the surface of the attachment portion 22 are orthogonal to each other. Further, as shown in the cross-sectional view of FIG. 2B, the attachment portion 22 is formed with a circular thin portion 22a.

  The region including the thin portion 22a in the mounting portion 22 and the thick portion 22b thicker than the thin portion 22a around the thin portion 22a is sandwiched between the upper and lower protrusions 2a and 2b {see FIG. 1 (b)}. It is a sandwiched area. The sandwiched region of the mounting portion 22 is sandwiched and welded integrally by the tips of the projecting portions 2a and 2b.

<Procedure of Embodiment>
Next, a procedure for attaching and fixing the wave eliminating plate 20 in the fuel tank 1 will be described with reference to FIGS. The wave canceling plate 20 is fixed inside the fuel tank 1 when the fuel tank 1 is manufactured by the fuel tank manufacturing apparatus 100 shown in FIGS.

  As shown in FIG. 3A, the fuel tank manufacturing apparatus 100 includes a pair of molding dies 110a and 110b, a pair of chuck portions 120a and 120b, a pair of expansion pins 130a and 130b, and a wave extinguishing plate. The mounting part 140 is provided.

  Respective concave molds 111a and 111b for molding the fuel tank 1 are provided on the respective molds 110a and 110b so as to face each other. Each of the molds 111a and 111b is provided with two pairs of rod-shaped projecting portions 112a and 112b that extend and contract in the opposite direction and in the opposite direction. The two pairs of protruding portions 112a and 112b are for forming the two pairs of protruding portions 2a and 2b of the fuel tank 1.

  One mold 110b is provided with a first blow pin 113a that blows out air and a second blow pin 113b that sucks and discharges air. The first blow pin 113a is provided at the center of the mold 111b so as to project and retract, and the second blow pin 113b is provided at the corner of the mold 111b so as to project and retract. Further, each mold 110a, 110b is provided with a pair of pinch portions 114a, 114b that expand and contract in the opposite direction and in the opposite direction on the lower end side. As shown in FIG. 4B, each pinch portion 114a, 114b extends in the facing direction and closes the lower end side of the parison 1a.

  Each chuck | zipper part 120a, 120b is provided above each shaping | molding die 110a, 110b. Each chuck | zipper part 120a, 120b hold | maintains the upper end side of the cylindrical or sheet-like parison 1a, and suspends the parison 1a between each shaping | molding die 110a, 110b. Further, as shown in FIG. 4B, the chuck portions 120a and 120b are moved in the opposite directions to press and close the upper end side of the parison 1a.

  Each expansion pin 130a, 130b opens and closes the lower end side of the parison 1a in order to insert the wave breaking plate 20 into the parison 1a.

  The wave-dissipating plate mounting portion 140 includes an expansion / contraction gripping portion 141 that grips the wave-dissipating plate 20 and expands and contracts. As shown in FIG. 3A, the extendable gripping portion 141 is arranged so that the gripped wave canceling plate 20 extends and moves between the molds 110a and 110b as shown in FIG. 3B. Is.

  Using the fuel tank manufacturing apparatus 100 having such a configuration, first, as shown in FIG. 3A, the upper ends of the parison 1a are held by the chuck portions 120a and 120b, and the parison is placed between the molds 111a and 111b. Hanging 1a. The expansion pins 130a and 130b are arranged in a closed state inside the suspended parison 1a. Further, the wave extinguishing plate 20 is held in the longitudinal direction by the expansion / contraction gripping portion 141 of the wave extinguishing plate mounting portion 140 located between the respective molds 110a and 110b.

  Next, as shown in FIG. 3B, the expansion pins 130a and 130b are opened, and the lower end side of the parison 1a is held at a predetermined interval. Next, the telescopic gripping portion 141 is extended, and the wave-dissipating plate 20 is inserted inside the parison 1a and held at a predetermined position between the molds 111a and 111b.

  Next, as shown in FIG. 4 (a), the protruding molded portions 112a and 112b are extended in the opposite direction, and the protruding molded portions 112a and 112b of the mounting portion 22 of the wave-dissipating plate 20 from the outside of the parison 1a. Press with the sandwiched area in between.

  Under the present circumstances, the press part of the parison 1a and the attachment part 22 fuse | melts by the press of the front-end | tips of each protrusion shaping | molding part 112a, 112b. Thereby, the to-be-clamped area | region containing the thin part 22a and the press part of the parison 1a weld.

  After this welding, as shown in FIG. 4B, the chuck portions 120a and 120b are moved in the opposite direction to press and close the upper end side of the parison 1a. Moreover, each pinch part 114a, 114b is extended to an opposing direction, and the lower end side of the parison 1a is obstruct | occluded.

  Next, as shown in FIG. 5A, pre-blow is performed by blowing air from a blow pin (not shown) provided at the distal end of the extendable gripping portion 141. Thereby, the inside of the parison 1a with the upper and lower ends closed is expanded by a predetermined amount.

  Next, blow molding is performed as shown in FIG. First, the expansion / contraction gripping portion 141 is contracted to the original position, and the respective molds 110a and 110b are moved and pressed in the opposing direction to perform mold clamping. At this time, the first and second blow pins 113a and 113b are projected and inserted into the parison 1a. Next, while a predetermined amount of air is blown by the first blow pin 113a, a predetermined amount of air is discharged by the second blow pin 113b, and the air pressure inside the clamped parison 1a is adjusted appropriately. As a result, the clamped parison 1a is pushed and transferred to the molds 111a and 111b to form a fuel tank molded product 1c.

Thereafter, the respective molds 110a and 110b are opened to take out the fuel tank molded product 1c, and the unnecessary parison 1a protruding from the upper and lower ends is cut. Then, as shown in FIG. 1, the fuel tank 1 is completed when the pump mounting hole 3 is opened at the center of the upper surface.

  However, the attachment part 22 of the both ends of the wave-cancelling board 20 mentioned above may be the uniform thickness in which the thin part 22a is not formed. In this case, when the mounting portion 22 is pressed by the protruding molded portions 112a and 112b through the parison 1a, the tip portions that become the protruding portions 2a and 2b of the parison 1a and the surface layer of the mounting portion 22 are melted together. It becomes a welded state.

<Effect of embodiment>
As described above, the wave-dissipating plate fixing structure 10 in the fuel tank 1 of the present embodiment includes the columnar portion 2 connected to the opposed inner walls of the resin fuel tank 1 and the wave-dissipating member welded to the columnar portion 2. The plate 20 is used. The columnar portion 2 is constituted by projecting portions 2 a and 2 b projecting from the upper and lower surfaces of the fuel tank 1, respectively. The wave canceling plate 20 has attachment portions 22 at both ends sandwiched between the protrusions 2a and 2b and welded to the tips of the protrusions 2a and 2b.

  According to this configuration, the projecting portions 2 a and 2 b in the fuel tank 1 are integrally welded to the mounting portion 22 with the mounting portion 22 of the wave-dissipating plate 20 interposed therebetween. For this reason, the deformation resistance and strength of the fuel tank due to the protrusions 2a and 2b are increased, and even when the inside of the fuel tank 1 becomes a positive pressure, the fuel tank 1 is hardly deformed in the direction of separating. In addition to the difficulty of deformation, the wave-extinguishing plate 20 can be firmly fixed because the projecting portions 2a and 2b are integrally welded and fixed to the mounting portion 22.

  Further, the wave eliminating plate 20 includes a thin portion 22a and a surrounding thick portion 22b, and the thin portion 22a is formed in a region (clamped region) sandwiched between the projecting portions 2a and 2b of the wave canceling plate 20. It has been configured.

  According to this structure, since the thin part 22a becomes easy to fuse | melt, each protrusion part 2a, 2b and the thin part 22a can be welded easily. Further, as in the present embodiment, the wave-dissipating plate 20 can be more firmly fixed by sandwiching the protruding portions 2a and 2b across the thin-walled portion 22a and the surrounding thick-walled portion 22b.

<Modification 1>
Next, the wave breaker plate of Modification 1 used for the wave breaker plate fixing structure in the fuel tank of the present embodiment will be described.

  The wave-dissipating plate of Modification 1 is different from the wave-dissipating plate 20 (see FIG. 2) of the above-described embodiment, as shown in FIGS. 6 (a) and 6 (b). However, it is in the shape of a plate having a uniform thickness, and a plurality of through holes 42a are formed in the sandwiched region. However, FIG. 6A is a perspective view showing the configuration of the wave-dissipating plate 40 of Modification 1, and FIG. 6B is a cross-sectional view taken along the line C-C of the mounting portion 42 of the wave-dissipating plate 40 shown in FIG.

  FIG. 7 shows a state in which the attachment portions 42 at both ends of the wave-dissipating plate 40 are sandwiched and welded by the projecting portions 2 a and 2 b in the fuel tank 1. The procedure for attaching and fixing the wave-dissipating plate 40 in the fuel tank 1 is the same as described above with reference to FIGS.

  Therefore, as shown in FIG. 7, the tips of the projecting portions 2 a and 2 b are melted by pressing by the butting of the projecting molded portions 112 a and 112 b shown in FIG. It flows into 42a. At this time, the tips of the projecting portions 2 a and 2 b are also melted with the surface layer of the mounting portion 42.

  Thereafter, when cooled, the molten resin material at the tips of the projecting portions 2 a and 2 b is solidified in a state of flowing into the through holes 42 a of the mounting portion 42, and the tips are welded to the surface layer of the mounting portion 42. Thereby, the front-end | tip of each protrusion part 2a, 2b and the attaching part 42 are fixed integrally.

  For this reason, since each protrusion part 2a, 2b welds directly through the through-hole 42a, it also welds to the surface layer of the attaching part 42, Therefore The coupling | bonding of the upper and lower protrusion parts 2a, 2b becomes stronger. Accordingly, the deformation resistance of the fuel tank 1 by the protrusions 2a and 2b is further increased, and even when the pressure inside the fuel tank 1 becomes positive, the fuel tank 1 is not easily deformed, and the wave breaker plate 40 is more firmly fixed. can do.

  In addition, in the modification 1, although the several through-hole 42a was formed in the attaching part 42 of the wave-cancelling board 40 as shown in FIG. 6, the wave-dissipating board 50 shown to FIG. 8 (a) and (b) is shown. As described above, a plurality of slits 52 a penetrating the mounting portion 52 may be formed in the mounting portion 52. Note that the mounting portion 52 has a uniform thickness as with the mounting portion 42.

  Each slit 52 a is formed in parallel in the sandwiched region of the mounting portion 52 so as to penetrate through a predetermined length in a direction orthogonal to the surface of the main body portion 21. However, the slits 52a may be formed in parallel in the sandwiched region so as to penetrate in the same direction as the surface of the main body 21 or in an oblique direction.

  Similarly to the case where the through-hole 42a is formed, the wave-dissipating plate 50 also melts the tips of the projecting portions 2a and 2b when pressed between the projecting molded portions 112a and 112b. Into the slit 52a. At the same time, the tips of the projecting portions 2a and 2b are melted with the surface layer of the mounting portion 52.

  Therefore, also in the wave-dissipating plate 50, the protrusions 2a and 2b are welded directly through the slit 52a and are also welded to the surface layer of the attachment part 52. Therefore, the connection between the protrusions 2a and 2b and the attachment part 52 are provided. And the bond becomes stronger. For this reason, the wave-cancelling board 50 can be fixed more firmly.

<Modification 2>
Next, the wave cancellation board of the modification 2 of this embodiment is demonstrated. As shown in FIG. 9, the feature of the wave-dissipating plate 60 of Modification 2 is that a plurality of through holes 62 c are formed in the thick portion 62 b around the thin portion 62 a in the sandwiched region of the mounting portion 62. . In addition, the thin part 62a and the thick part 62b of the attachment part 62 are the same as the thin part 22a and the thick part 62b of the attachment part 22 shown in FIG.

  The procedure for fixing the wave canceling plate 60 in the fuel tank 1 is the same as described above with reference to FIGS. Therefore, the tips {FIG. 1 (b)} of the projecting portions 2a and 2b are made to be thin portions of the mounting portion 62 shown in FIG. 9 by pressing due to the butting of the projecting molded portions 112a and 112b shown in FIG. 4 (a). At the same time, the molten resin material at the tip flows into the plurality of through-holes 62c around the thin portion 62a. Furthermore, the tips of the projecting portions 2a and 2b are melted with the surface layer portions other than the thin-walled portion 62a and the through hole 62c in the sandwiched region.

  Thereafter, when cooled, the tips of the projecting portions 2a and 2b are welded in a state of being mixed with the thin-walled portion 62a and are directly welded up and down through the plurality of through holes 62c. At the same time, the tips of the protruding portions 2a and 2b are welded to the surface layer portions other than the thin-walled portion 62a and the through hole 62c in the sandwiched region.

  Therefore, when the wave canceling plate 60 of the modified example 2 is used, the protruding portions 2a and 2b are welded directly through the through holes 62c of the mounting portion 62, and are also welded to the thin portion 62a, and further, the thin portion 62a. Also welded to the surface layer around. For this reason, the coupling | bonding with the attachment part 62 clamped by the coupling | bonding of the upper and lower protrusion parts 2a and 2b and the protrusion parts 2a and 2b becomes strong. Therefore, the wave eliminating plate 60 can be fixed more firmly.

  A slit (not shown) may be formed around the thin portion 62a of the attachment portion 62 instead of the through hole 62c.

<Modification 3>
Next, the wave cancellation board of the modification 3 of this embodiment is demonstrated. As shown in FIG. 10, the feature of the wave breaker plate 70 of the third modification is that a plurality of slits 72c are formed across the thin portion 72a and the thick portion 72b around the thin portion 72a in the sandwiched region of the attachment portion 72. It is in the point formed. The plurality of slits 72c are arranged such that each planar shape forms a triangle and the apex of the triangle faces the center of the thin portion 22a. In addition, the thin part 72a and the thick part 72b of the attachment part 72 are the same as the thin part 22a and the thick part 72b of the attachment part 22 shown in FIG.

  The procedure for fixing the wave canceling plate 70 in the fuel tank 1 is the same as described above with reference to FIGS. Therefore, the tips {FIG. 1 (b)} of the projecting portions 2a and 2b are made to be thin portions of the mounting portion 72 shown in FIG. 10 by pressing by the butting of the projecting molded portions 112a and 112b shown in FIG. 4 (a). At the same time, the molten resin material at the tip flows into the plurality of slits 72c. Furthermore, the tips of the projecting portions 2a and 2b are melted with the surface layer portions other than the thin portion 62a and the slit 72c in the sandwiched region.

  Thereafter, when cooled, the tips of the projecting portions 2a and 2b are welded in a state of being mixed together with the thin portion 72a of the sandwiched area and are directly welded through the plurality of slits 72c. At this time, since each slit 72c is formed across the thin wall portion 72a and the surrounding thick wall portion 72b, the melted thin wall portion 72a and the molten resin material flowing into each slit 72c are integrally welded. It becomes easy. At the same time, the tips of the protrusions 2a and 2b are also welded to the thick part 72b around the thin part 62a.

  Therefore, when the wave canceling plate 70 of the third modification is used, the projecting portions 2a and 2b are directly coupled to each other in the sandwiched region of the mounting portion 72 via the slit 72c, and integrated with the slit 72c portion. The welded thin-walled portion 72a is also integrally coupled, and is also coupled to other surface layer portions. For this reason, the coupling between the upper and lower protrusions 2a and 2b and the coupling with the mounting portion 72 become stronger. Therefore, the wave eliminating plate 70 can be more firmly fixed.

  In addition, instead of the thin-walled portion 72a of the mounting portion 72 and the slit 72c straddling the peripheral portion, a through-hole having an elliptical shape (not shown) may be formed straddling similarly.

  Although the embodiments and modifications of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, the shape of the wave-dissipating plate described above is an example, and may be appropriately changed according to the size and shape of the fuel tank 1.

DESCRIPTION OF SYMBOLS 1 Fuel tank 1a Parison 2a, 2b Protrusion part 3 Pump attachment hole 10 Wave plate fixing structure 20, 40, 50, 60, 70 Wave plate 21 Main part 21a, 42a, 62c Through-hole 22, 42, 52, 62, 72 Mounting portion 22a, 62a, 72a Thin portion 22b, 62b, 72b Thick portion 52a, 72c Slit 100 Fuel tank manufacturing apparatus 110a, 110b Mold 111a, 111b Form 112a, 112b Projection molding 113a First blow pin 113b Second Blow pin 114a, 114b Pinch part 120a, 120b Chuck part 130a, 130b Expansion pin 140 Wave vane plate attachment part 141 Extendable grip part

Claims (1)

Columnar portions connected to the opposing inner walls of the resin fuel tank;
A wave-dissipating plate having a main body portion that suppresses the undulation of the fuel, and an attachment portion that is provided at an end portion of the main body portion and includes a thin wall portion and a thick wall portion ,
The columnar part is configured by projecting projecting parts projecting from the opposed inner walls to each other,
A slit is provided across the thin portion and the thick portion around the thin portion while penetrating in the thickness direction of the thick portion of the wave eliminating plate,
In the fuel tank, the thin portion of the wave-dissipating plate is sandwiched between the protrusions and welded to the tip of the protrusion, and the resin of the columnar portion enters the slit . Wave plate fixing structure.

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