JPH0530503Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a noise reduction structure for a fuel tank mounted on a vehicle.

(Prior art) As a conventional noise-muffling structure for a fuel tank, for example, Fig. 16 and Fig.
There is something like the one shown in Figure 7. That is, in this structure, a buttful plate 103 made of a steel plate is vertically disposed within a fuel tank 101 made of a steel plate. A flange 105 is provided on the upper edge of the full plate 103, and this flange 105 is connected to the fuel tank 101.
It is joined to the inner upper wall surface 107 by spot welding or the like. The forward and backward movement of the fuel during starting and control of the vehicle is regulated by the baffle plate 103 to prevent collision noise and the like against the inner wall surface of the fuel tank 101.

(Problem to be solved by the invention) By the way, when the stiff stiff plate 103 receives the above-mentioned fuel movement force, a large load is concentrated on the welded part between the flange 105 and the upper wall surface 107. Become something. Therefore, in order to prevent cracks from occurring in the fuel tank 101 due to such concentrated loads, it is difficult to reduce the thickness of the fuel tank 101 beyond a certain level, and there are limits to weight reduction, such as the need for reinforcing materials. It was hot.

On the other hand, it has been known to have a resin fuel tank integrally molded with a buttful plate to reduce weight.

However, since the protruding amount of the buttful plate is generally large and it is a thin plate, when blow molding is performed, the resin may not be fully attached to the base of the buttful plate, or the amount of resin elongated may be large in some parts. It's too much. As a result, a predetermined buff-shaped plate cannot be obtained, and the molded wall thickness tends to be uneven, making it difficult to control the wall thickness.

In any case, in the case where the full plate 103 is vertically disposed from the upper wall surface 107 as described above, fuel may collide with the inner wall corner portion 109 when the vehicle suddenly brakes near a full fuel tank. However, it was not sufficient to suppress the so-called thud sound and the so-called pop sound generated when waves rising on the liquid surface due to rapid movement of fuel collide with the inner wall surface corner portion 109.

Particularly in recent years, in four-wheel drive vehicles and the like, there has been a tendency for fuel tanks to be structurally located under the floor panels of rear seats, and fuel tanks have become thinner and have larger cross-sectional areas. Therefore, crackling and thumping noises are more likely to occur at the corners of the inner wall surface, and there is a great need for countermeasures against them.

Furthermore, since the bump-full plate 103 itself is hard and has a flat surface, it causes a popping sound due to fuel collision. For this reason, the reality is that either structure does not provide the expected silencing effect.

On the other hand, it is also known that a resin buttful plate is bonded to the upper wall surface 107 of the fuel tank 101, and this has some effect on the upper wall surface.

However, if the flat buff-full plate is bent and adhered to the inner wall corner portion 109, there is a risk that the buff-full plate 109 may peel off due to its elastic restoring force. Further, there was a problem in that it was difficult to attach a bumpy plate, etc., which had an uneven surface and had a small adhesion area.

Therefore, this idea allows for easy installation of even a buttful plate with a difficult-to-adhesive shape to the corner of the inner wall, suppresses the increase in the number of parts, and reduces the thumping noise caused by the corner of the inner wall of the fuel tank. The purpose of the present invention is to provide a noise-muffling structure for a fuel tank that can more effectively muffle noise.

[Structure of the invention] (Means for solving the problem) In order to achieve the above-mentioned object, the noise reduction structure of the fuel tank of this invention uses a resin box having a certain thickness and a large number of voids with an open surface. In a fuel tank noise reduction structure in which a full plate is attached to the inner wall corner of the fuel tank, an engaging recess is provided at one edge of the first half full plate, and a member protruding from the upper or lower wall surface of the fuel tank. The engagement recess of the buff-full plate is fitted into the outer circumferential portion, the member is provided with a flange facing the wall surface of the fuel tank with one edge of the buff-full plate sandwiched therebetween, and the other side of the buff-full plate The edge of the fuel tank is secured to the side wall of the fuel tank.

(Function) In the fuel tank noise reduction structure configured as described above, one edge of the buttful plate is inserted between the flange of the member protruding from the upper or lower wall surface of the fuel tank and the wall surface. By fitting the engagement recess into the outer circumference of the member and locking the other edge of the buttful plate to the side wall of the fuel tank,
The buttful plate can be easily attached to the inner wall corner of the fuel tank.

When the fuel attempts to collide with the inner wall corner portion of the fuel tank due to its movement, the fuel first collides with the resin buttful plate. and,
When the surface of the buffle plate is covered with fuel, air is trapped in the numerous voids of the buffle plate, which alleviates the collision force of the fuel and prevents so-called thud noise.

When waves and the like rising on the liquid surface collide with the buff-full plate, they are dispersed and dissipated by the large number of voids opened on the surface of the buff-full plate, making it possible to suppress so-called pitch noise.

(Example) Examples of this invention will be described below.

1 to 7 relate to a first embodiment of this invention, in which FIG. 1 is a cross-sectional view of the fuel tank 1 shown in FIG. 3, for example, taken along the - line, and FIG. It is a perspective view seen from a plane. fuel tank 1
is made of resin, for example, and the upper shell 3 and lower shell 5 are integrally blow-molded. This fuel tank 1 is provided, for example, on the lower surface of a floor panel in the rear seat of a four-wheel drive vehicle, and the fuel tank 1 as a whole is thin and has a large cross-sectional area.

A baffle plate 9 is attached to the corner portion 7 of the inner wall surface of the fuel tank 1, for example, as shown in FIGS.
It looks like the picture.

First, to explain its shape, the buff-full plate 9 is constructed in a mesh shape using a resin wire 11 made of, for example, polypropylene, polyethylene, nylon, or the like. Each resin wire 11 is formed into a wavy shape, and when viewed from the direction of arrow A in FIG. 5, the surface has a wavy shape with inward mountain ridges appearing at regular intervals at the corners as shown in FIGS. 6 and 7. When viewed from the direction of arrow B in the figure, the resin wire rods 11 are intertwined with a substantially uniform thickness.
A gap 13 is formed between each resin wire 11. Therefore, the baffle plate 9 has a constant thickness and has a large number of voids 13 with the surface open.
The structure has the following features. Batsuful plate 9
The void density and thickness of can be selected as appropriate.

On the other hand, the buff-full plate 9 having such a shape is provided with a semicircular engagement recess 15 as shown in FIG. 4 at one edge 9a shown in FIG.

Further, a cylindrical retainer 19 is attached to the working hole 17 of the upper shell 3 as a member protruding from the upper wall surface 18 of the fuel tank 1. The engagement recess 15 of the full plate 9 is connected to the retainer 1.
It has a size corresponding to the outer peripheral part 21 of No. 9, and is fitted into this outer peripheral part 21 as shown in FIG.

As shown in FIG. 4, an upper flange 23 is integrally formed on the outer periphery of the upper end of the retainer 19, and this upper flange 23 is fixed to the upper shell 3 around the working hole 17 by heat welding or adhesive. As shown in FIG. 4, an engagement flange 25 is partially provided on the outer periphery of the lower end of the retainer 19. As shown in FIG. This engagement flange 25 faces the upper wall surface 18 of the fuel tank 1 with one edge 9a of the buttful plate 9 in between, and supports the one edge 9a from the lower surface side.

Note that a cap 27 is screwed into the retainer 19 in a sealed manner.

On the other hand, the other edge 9 of the buff full plate 9
b is secured to the side wall portion 29 of the fuel tank 1. That is, a convex portion 31 that protrudes inward of the fuel tank 1 within a range corresponding to the width of the buttful plate 9 is formed on the upper part of the lower shell 5 constituting the side wall portion 29. 33 are configured. The other edge 9b of the buff-full plate 9 is supported so as to abut against this support surface 33.

A chamber 35 is fixed to the lower shell 5 by heat welding or the like as shown in FIG. 1, and a fuel gauge unit 37 is attached to the upper shell 3 as shown in FIG. Although the lower part of the fuel gauge unit 37 is omitted in FIG. are arranged accordingly. Therefore, even if the fuel tank 1 shakes together with the vehicle body when the fuel level becomes low, the liquid level in the chamber 35 will fluctuate less than in other parts, so the liquid level will be lowered by the float of the fuel gauge unit 37. Detection is relatively reliable, and there is no possibility that air will be sucked into the outlet pipe.

Next, the order of attaching the baffle plate 9 will be described.

First, the retainer 19 was not attached to the working hole 17 at first, and the chamber 3 was inserted into the working hole 17.
5. Install other functional parts.

Next, the retainer 19 is attached to the working hole 17. At this time, the engagement flange 25 is inserted through the working hole 17, and since the engagement flange 25 is only partial, the insertion can be easily performed. Next, the upper flange 23 of the retainer 19 is fixed to the upper shell 3 by heat welding, adhesive, or the like. The baffle plate 9 is inserted through the working hole 17 where the retainer 19 is attached. Then, the other edge 9b is curved and deformed toward the inner wall corner portion 7 while being in contact with the support surface 33, and the one edge 9a is connected to the engagement flange 25 of the retainer 19 and the upper wall surface 18 of the upper shell 3. and insert the engaging recess 15 between the outer circumference 2 of the retainer 19.
1.

In this state, one edge 9a of the buffful plate 9 is pressed against the retainer 19 and the other edge 9b is pressed against the support surface 33 due to its elastic force, and the engagement recess 15 is pressed against the outer periphery of the retainer 19. Part 2
1, vibration in the width direction is restricted. Therefore, even if a resin mesh like the buttful plate 9 has an uneven surface and has a small adhesion area, it is difficult to attach it to the inner wall corner 7 by adhesion or heat welding. It can be installed extremely easily. Furthermore, the number of parts is extremely reduced because the retainer 19 for closing the working hole 17 and the convex portion 31 formed when blow molding the fuel tank 1 are used without requiring adhesive or special fittings. . Thereafter, the cap 27 is screwed onto the retainer 19 in a sealed manner.

Next, we will discuss the effect.

For example, even when the fuel tank is near full as shown in FIG. 1, or when the fuel is running low, the fuel may collide with the inner wall corner portion 7 due to the movement of the fuel when the vehicle starts and brakes. At this time, the fuel first collides with the buffer plate 9, so the air gap 1
The air inside 3 is trapped between it and the inner wall corner 7 as shown in FIG. 6, and generates an elastic force as shown by the arrow in the figure. Therefore, the impact force acting on the inner wall corner portion 7 is alleviated by the trapped air, and the bumpy plate 9 itself also reduces the impact force through elastic deformation, thereby suppressing the thud sound. can.

When the fuel tank is near a full tank, waves rise on the fuel level due to vibrations during normal vehicle start-up and braking, and these waves collide with the buff-full plate 9.
Therefore, the void 15 formed between the resin wire rods 13
As a result, the waves are dispersed and dissipated as shown by the arrows in the same figure, and the pitch noise against the inner wall corner portion 7 is suppressed.

In addition, in such a buff-full plate 9, as shown in Fig. 6, the trapped air is enlarged, so even if a certain degree of thickness is ensured, there are voids 13, so when the tank is full, fuel will not be in the voids 13. It is possible to suppress the volume reduction inside the fuel tank 1 as much as possible.

Since the surface of the baffle plate 9 is not flat, it is possible to prevent the occurrence of a crackling sound due to waves colliding with the buffle plate itself, as in the conventional case.

When the fuel collides with the baffle plate 9, the upper shell 3 receives the load through the trapped air, so there is no part where a large load acts intensively. Therefore, fuel tank 1
The thickness of the fuel tank 1 can be made as thin as possible, and together with the fact that the thick plate 9 is made of resin, this greatly contributes to reducing the weight of the fuel tank 1.

In this first embodiment, the member protruding from the upper wall surface 18 of the fuel tank 1 is not limited to the retainer 19, but the fuel gauge unit 37 can also be used. Further, the other edge 9b of the baffle plate 9 can be engaged with a convex portion provided on the upper shell 3 at the side wall portion 29. The baffle plate 9 can also be spanned between the retainer 19 and the support surface 33 without being elastically deformed.
The fuel tank 1 can also be made of steel plate.

FIG. 8 is an enlarged perspective view of a main part showing a modification of the buff-full plate 9. FIG. This Batsuful plate 39
For example, a large number of resin needles 43 are provided protruding from the surface of a resin base material 41, and have a constant thickness and a large number of surface-open spaces 45 between the resin needles 43. ing. Note that the length and implantation density of the resin needles 43 of the buff-full plate 39 can be selected as appropriate.

This baffle plate 39 has the resin base material 43 side facing the inner wall corner portion 7, and the resin needle material 4
The third side faces the liquid surface side. The buff-full plate 39 is fixed to the inner wall corner portion 7 in the same manner as described above.

In this baffle plate 39 as well, air is trapped by the air gap 45 as shown in FIG.
By dispersing the waves as shown in FIG. 10, it is possible to suppress the popping sound and the thud sound. Furthermore, in this modification, the bending of the resin needle material 43 also contributes to suppressing the thump sound.

FIG. 11 shows still another modification of the buff-full plate 47, in which the buff-full plate 47 is constructed in a mesh shape with a linear resin plate 49, and this resin plate 49 By standing in the direction, the thickness of the thick plate 47 itself is ensured. A large number of gaps 51 are provided between the resin plates 49.
Note that the void density and thickness of the buff-full plate 47 can also be selected as appropriate.

This modification can also be attached to the corner portion 7 of the inner wall surface in the same manner as the buff-full plate 9 described above.

Further, as shown in FIGS. 12 and 13, the thumping sound and the popping sound can be suppressed, and furthermore, the manufacturing of the bump-full plate 47 is facilitated.

FIGS. 14 and 15 show a second embodiment of this invention. In this embodiment, the fuel tank 53 is made of a steel plate, for example, and has an upper shell 55 and a lower shell 57 welded together. A chamber 61 protruding from the lower wall surface 59 is used as a member. This chamber 61 is fixed to the lower shell 57 by spot welding or the like, and is provided with an engagement flange 63 around its upper end.
It faces the lower wall surface 59 of the fuel tank 53 with one edge 9a of the fuel tank 53 in between. Then, the engagement recesses 15 of the buttful plates 9, 39, 47 engage with the outer circumference 67 of the chamber 61, and the other edge 9
b is secured to the side wall portion 69 of the fuel tank 53 at the lower end of the upper shell 55 so as to be pressed slightly downward.

Buffful plates 9, 3 in this second embodiment
The installation order for 9 and 47 is to first install Atsupashiel 5.
5 and the lower shell 57 by welding, the chamber 61 is fixed to the lower shell 57 by spot welding or the like.

Next, the engagement recesses 15 of the buff-full plates 9, 39, 47 are fitted into the outer circumference 67 of the chamber 61, and the other edge 9b is locked to the upper end of the lower shell 57. The upper shell 55 is stacked on the lower shell 57 and both are fixed by seam welding. At this time, Batsuful plates 9, 39,
The other edge 9b of the upper shell 55 is pressed slightly downward at the lower part of the upper shell 55, and is securely supported between the upper shell 55 and the chamber 61.

Incidentally, the baffle plates 9, 39, 47 can also be attached by being inserted through the working hole 71 after the upper shell 55 and lower shell 57 are joined. In this case, the working hole 71 is closed as in the first embodiment, but the hole for attaching the fuel gauge unit can also be used without providing a special working hole.

When the fuel is about to oscillate due to starting, braking, etc. of the vehicle, the fuel is
The rocking is regulated by the resistance etc. when passing through the gaps 13 and 51 of 9 and 47, and it is possible to suppress the popping sound and the like.

When the fuel is about to collide with the inner wall corner 73 of the lower shell 57 due to a sudden start or sudden braking of the vehicle when the remaining amount is low, the fuel first collides with the buttful plates 9, 39, 47, and the air gap 1
3, 45, 51, air is temporarily trapped in the gaps 13, 45, 51 by the sudden collision, and the air is further dispersed by the buffful plates 9, 45, 51.
39 and 47 are also elastically deformed, thereby reducing the collision force and suppressing the thumping noise against the inner wall corner portion 73. The oscillation of the fuel when the remaining amount is low is dissipated and dissipated by colliding with the buff-full plates 9, 39, 47, and it is possible to suppress the popping noise and the like against the inner wall corner portion 73.

In this second embodiment, the buff-full plates 9, 39, 47 can also be supported so as to be curved and deformed along the inner wall corner portions 73. In this case, it is desirable to form a convex portion on the upper shell 55 in the side wall portion 69 to lock the other edge 9b of the buff-full plate 9. or,
The fuel tank 53 may also be made of resin, in which case the chamber 61 is fixed to the lower wall surface 59 by heat welding or the like.

[Effects of the invention] As is clear from the above, according to the configuration of this invention, when the fuel collides with the inner wall corner portion due to the movement of the fuel, the air in the numerous voids of the buttful plate is trapped. Demonstrates resilience,
The impact force acting on the wall surface is alleviated, and thud noise can be suppressed.

The large number of gaps in the baffle plate can dissipate waves of fuel, so it is possible to suppress crackling noise and the like.

In addition, since the baffle plate has a large number of open spaces, its surface is not flat, and it is possible to suppress the popping sound caused by waves colliding with the surface of the buffle plate.

Because the full plate has many voids,
Even if a certain degree of thickness is ensured in order to suppress popping and thumping sounds, it is possible to suppress a decrease in the volume inside the fuel tank.

Even if fuel collides with the bumpy plate, a large load will not be concentrated on it, making it possible to make the fuel tank thinner and lighter.

The full plate is a member that protrudes from the top or bottom wall of the fuel tank, even though its surface is uneven and the adhesive area is small, making it difficult to adhere or heat weld to the corners of the inner wall of the fuel tank. It can be attached to the inner wall corner using the Therefore, the number of parts is reduced and assembly becomes extremely simple.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a fuel tank to which a noise-absorbing structure according to the first embodiment of the invention is applied.
2 is a perspective view from the same plane, 3 is a perspective view of the fuel tank, 4 is an enlarged exploded perspective view of the main parts, and 5 is a cross-sectional view of the full plate. Perspective view, Figures 6 and 7 are action explanatory views, Figure 8
9 and 10 are action explanatory diagrams. FIG. 11 is a perspective view of a buff full plate according to another modification, and FIGS. 12 and 13. is an action explanatory diagram, and Figure 14 is the second diagram.
FIG. 15 is an enlarged exploded perspective view of the same essential parts, FIG. 16 is a vertical cross-sectional view of a fuel tank to which a conventional noise-absorbing structure is applied, and FIG. 17 is a cross-sectional view of the same. 1... Fuel tank, 7, 73... Inner wall corner section, 9, 39, 47... Buff full plate, 1
3, 45, 51... void, 19... retainer (member), 29, 69... side wall portion, 33... support surface,
61... Chamber (member).

Claims (1)

[Scope of utility model registration request] A noise-absorbing structure for a fuel tank in which a resin buff-full plate having a certain thickness and a large number of open-surface gaps is attached to an inner wall corner of the fuel tank, wherein the buff-full plate is attached to one edge of the buff-full plate. A mating recess is provided, and the engaging recess of the buff-full plate is fitted into the outer peripheral part of a member protruding from the upper wall surface or the lower wall surface of the fuel tank, and one edge of the buff-full plate is sandwiched between the member and the A noise reduction structure for a fuel tank, characterized in that an engagement flange facing a wall of the fuel tank is provided, and the other edge of the buttful plate is locked to a side wall of the fuel tank.