JP2012224113A - Fuel tank for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel tank for an automobile, in which a heat insulating member is easily formed, with simple equipment.SOLUTION: In the fuel tank 10 for an automobile, which is attached to an automobile, at least the bottom section 13 of the fuel tank 10 is covered with a cover member 21. A gap is formed between the cover member 21 and the fuel tank 10, and synthetic resin foaming microspheres 27 is filled in the gap. The filled synthetic resin foaming microspheres 27 are mutually adhered or welded and integrated by an adhesive agent or heated steam etc. after filling.

Description

  The present invention relates to a fuel tank for an automobile that is attached to a lower part of an automobile floor panel.

  Conventionally, a fuel tank for an automobile is often attached under a floor panel because of space. In this case, since an exhaust pipe or the like is provided under the floor panel, heat from the exhaust pipe or the like is transmitted to the fuel tank. For this reason, in order to prevent the temperature rise of the fuel tank, the fuel tank is thermally insulated.

  For example, as shown in FIG. 5, the fuel tank 110 covers the bottom 113 of the fuel tank 110 with a heat insulating cover 121, and air or glass wool that is a heat insulating material 124 is fitted between the fuel tank 110 and the heat insulating cover 121. The heat insulation cover 121 and the fuel tank 110 are held on the vehicle body by the band 125 (see, for example, Patent Document 1). However, in this case, it is necessary to form glass wool in accordance with the shape of the fuel tank 110, which is troublesome, and in the case of air, heat insulation is insufficient, and in order to improve heat insulation, confidentiality is required. If sufficient, the seal structure becomes complicated and the cost may increase.

Further, as shown in FIG. 6, substantially the entire outer surface of the fuel tank 210 is covered with a relatively soft heat insulating material 223, and a relatively hard heat insulating material 224 is disposed at a portion in contact with the vehicle body 201 and the tank band 225. (For example, refer to Patent Document 2).
However, in this case, it is necessary to form the heat insulating materials 223 and 224 in accordance with the shape of the fuel tank 210, which requires time for molding and time for assembling the fuel tank 210.

Further, as shown in FIG. 7, there is a type in which the foaming raw material (beads) before foaming is uniformly filled around the tank 310 and then the foaming raw material (beads) is foamed to form a heat insulating layer 324 (for example, , See Patent Document 3).
However, in this case, it is necessary to foam the foaming raw material (beads) after filling the foaming raw material (beads) before foaming around the tank 310, and there is a facility for covering the entire tank 310 heated for foaming. For example, the heat insulating layer 324 could not be formed on only half of the tank 310.

Japanese Utility Model Publication No. 4-90425 JP-A-10-236172 JP 2008-64366 A

  An object of the present invention is to provide a fuel tank for an automobile in which the formation of a heat insulating member is easy and the equipment is simple.

The present invention of claim 1 for solving the above-mentioned problems is a fuel tank for automobiles attached to automobiles.
At least the bottom of the fuel tank is covered with a cover member, and a gap is formed between the cover member and the fuel tank. The gap is filled with the synthetic resin foam small spheres. A fuel tank for automobiles, which is bonded or welded to the vehicle.

  In the present invention of claim 1, since at least the bottom of the fuel tank is covered with the cover member, even when the fuel tank is mounted under the floor panel of the vehicle body, The influence of the received heat on the fuel tank can be reduced to prevent the fuel from evaporating. Further, the cover member can prevent pebbles from the road from directly hitting the fuel tank.

  Since a gap is formed between the cover member and the fuel tank and the gap is filled with the synthetic resin foam small spherical body, a heat insulating layer can be formed in the gap between the cover member and the fuel tank. The influence of heat from the outside can be reduced. Since the already expanded synthetic resin foamed small spherical body is filled, it is not necessary to heat the unfoamed foam for foaming compared to the case of filling the unfoamed foam, and simple equipment is sufficient. Moreover, since it foams reliably, the heat insulation effect is large.

The synthetic resin foamed small spherical bodies are bonded or welded to each other after filling. For this reason, when filling the synthetic resin foamed small spherical body, it is possible to reliably fill the concave portions of the fuel tank with the various synthetic resin foamed small spherical bodies, which can be uniformly filled, and a necessary part of the fuel tank. Can be reliably covered with the synthetic resin foam small spherical body.
Since the synthetic resin foam small spheres are bonded or welded to each other after filling, the synthetic resin foam small spheres can be arranged along the shape of the fuel tank. The foamed small spherical body is not separated from the concave portion of the fuel tank or the like, and is not biased to one side, so that a uniform heat insulating layer can be maintained and the heat insulating property can be maintained for a long time.

  The present invention of claim 2 is a fuel tank for automobiles, wherein the synthetic resin foamed small spherical body is a foamed small spherical body of polypropylene, polyethylene or polystyrene.

  In the present invention of claim 2, since the synthetic resin foamed small spherical body is a foamed small spherical body of polypropylene, polyethylene or polystyrene, it is excellent in durability and can maintain heat insulation even during long-term use. . Further, the synthetic resin foamed small spherical body can be lightened, which can contribute to the weight reduction of the automobile. When the fuel tank and the cover member are made of polypropylene or polyethylene, they are easily bonded or welded to the synthetic resin foam small spherical body.

  According to a third aspect of the present invention, the synthetic resin foamed small spherical body is a fuel tank for automobiles having a diameter of 1 to 5 mm.

  In the present invention of claim 3, since the synthetic resin foamed small spherical body has a diameter of 1 to 5 mm, it can be reliably filled into a narrow gap such as a recess according to the shape of the fuel tank. Heat insulation can be obtained. In addition, when filling between the fuel tank and the cover member, the nozzle opening for blowing the synthetic resin foam small spherical body is not large, and it is easy to fill from the nozzle. When the diameter of the synthetic resin foamed small spherical body is less than 1 mm, the heat insulating effect is small and handling is inconvenient. When the diameter exceeds 5 mm, the recess of the fuel tank is not reliably filled, the nozzle opening becomes large, and filling is troublesome.

  According to a fourth aspect of the present invention, the cover member is an automobile fuel tank in which a plurality of holes smaller than the diameter of the synthetic resin foam small spherical body are formed.

  In the present invention of claim 4, since the cover member is formed with a plurality of holes smaller than the diameter of the synthetic resin foam small spherical body, when the synthetic resin foam small spherical body is filled between the fuel tank and the cover member, The air used for blowing the synthetic resin foam small spheres can be discharged from the small holes, and the synthetic resin foam small spheres can be uniformly filled between the fuel tank and the cover member. In addition, after filling the synthetic resin foam small spheres, heat steam or the like is blown from the small holes in the cover member to heat the synthetic resin foam small spheres or to bond the adhesive by blowing adhesive. Air, adhesive solvent and air can be discharged.

  According to a fifth aspect of the present invention, the cover member is a fuel tank for an automobile that covers a side portion or a side portion and an upper portion in addition to the bottom portion of the fuel tank.

  In the present invention of claim 5, since the cover member covers the side part or the side part and the upper part in addition to the bottom part of the fuel tank, the cover member is exposed under the floor panel of the vehicle body when covering the bottom part and the side part. The portion of the fuel tank that is present can be covered with a heat insulating material, and the heat insulating effect of the fuel tank can be improved. When covering the side and top in addition to the bottom of the fuel tank, a heat insulating material can be provided over the entire surface of the fuel tank, and the heat insulating effect of the fuel tank can be further improved.

  The present invention of claim 6 is a fuel tank for an automobile in which a plurality of support members that contact the fuel tank and the cover member are provided between the cover member and the fuel tank.

  In the present invention of claim 6, since a plurality of support members that contact the fuel tank and the cover member are provided between the cover member and the fuel tank, the support member allows a gap between the fuel tank and the cover member to be set to a predetermined value. The dimensions can be maintained, and the synthetic resin foamed small spherical bodies can be arranged uniformly. Further, if the support member is fixed to the cover member and the fuel tank, the cover member is not displaced from the fuel tank, and the cover member is securely held.

  The present invention of claim 7 is a fuel tank for automobiles, wherein the cover member is formed of a synthetic resin and is formed by injection molding or vacuum molding in accordance with the shape of the fuel tank so as to cover the fuel tank.

  In the present invention of claim 7, since the cover member is formed of synthetic resin and is formed by injection molding or vacuum molding in accordance with the shape of the fuel tank so as to cover the fuel tank, the cover member is interposed between the cover member and the fuel tank. Can be made constant, the heat insulating layer of the synthetic resin foam small spherical body can be formed uniformly, and the heat insulating effect can be improved.

  The present invention of claim 8 is a fuel tank for automobiles, wherein the cover member is formed of glass fiber or non-woven fabric, and is compression-molded according to the shape of the fuel tank so as to cover the fuel tank. .

  In the present invention of claim 8, the cover member is formed of glass fiber or non-woven fabric, and is formed by compression molding in accordance with the shape of the fuel tank so as to cover the fuel tank. The material can be formed into a cover member that can cover the fuel tank. Therefore, the gap between the cover member and the fuel tank can be made constant, the heat insulating layer of the synthetic resin foam small spherical body can be formed uniformly, and the heat insulating effect can be improved.

  According to a ninth aspect of the present invention, there is provided a fuel tank for an automobile in which a seal member is inserted between the tip of the cover member and the fuel tank.

  In the present invention of claim 9, since the seal member is inserted between the tip of the cover member covering the fuel tank and the fuel tank, the synthetic resin foam small spherical body is filled between the cover member and the fuel tank. When and after the filling, when the synthetic resin foam small spheres are bonded or welded, the synthetic resin foam small spheres can be prevented from spilling out from the tip of the cover member covering the fuel tank. In addition, after the fuel tank is attached to the vehicle body, it is possible to prevent rainwater and dust from entering between the cover member and the fuel tank and reducing heat insulation.

  According to a tenth aspect of the present invention, there is provided a fuel tank for automobiles, wherein the sealing member is a sponge material, a double-sided adhesive tape or an adhesive.

In the present invention of claim 10, since the sealing member is a sponge material, a double-sided adhesive tape or an adhesive, the sealing material can be reliably and easily attached between the cover member and the fuel tank.
In the case of a sponge material, when the synthetic resin foam small spherical body is blown, air can be discharged from the sponge material, and the synthetic resin foam small spherical body can be filled up to the tip of the cover member. In the case of a double-sided adhesive tape or an adhesive, the sealing material can be attached simply by pressing the tip of the cover member against the fuel tank.

  Since a gap is formed between the cover member and the fuel tank and the gap is filled with the synthetic resin foam small spherical body, a heat insulating layer can be formed in the gap between the cover member and the fuel tank. The effect of heat can be reduced. Since the already foamed synthetic resin foamed small spherical body is filled, it is not necessary to heat the unfoamed foam for foaming as compared with the case of filling the unfoamed foam.

Since the synthetic resin foam small spheres are scattered before filling, when filling the synthetic resin foam small spheres, the recesses of the fuel tank can be reliably filled.
Since the synthetic resin foam small spheres are bonded or welded to each other after filling, the synthetic resin foam small spheres can be arranged along the shape of the fuel tank. The foamed small spherical body does not leave the recess of the fuel tank.

It is sectional drawing of the state which attached the cover member to the fuel tank which is embodiment of this invention. It is sectional drawing of the state which enclosed the synthetic resin foam small spherical body after attaching a cover member to the fuel tank which is embodiment of this invention. It is sectional drawing of the state which enclosed the synthetic resin foaming small spherical body after attaching a cover member to the fuel tank which is embodiment of this invention, and injected the heating vapor | steam. It is a perspective view of the fuel tank used for this invention. It is sectional drawing of the state which attached the heat insulation member to the conventional fuel tank. It is sectional drawing of the state which attached the heat insulation member to the other conventional fuel tank. It is sectional drawing of the state which attached the heat insulation member to the other conventional tank.

An automotive fuel tank 10 provided with a heat insulating structure according to an embodiment of the present invention will be described with reference to FIGS.
A fuel tank 10 used in an embodiment of the present invention includes a tank upper portion 11, a tank side portion 12, and a tank bottom portion 13, and is integrally formed. In the present invention, the fuel tank 10 may be formed by separately forming an upper shell and a lower shell and then fixing them together.

  As shown in FIG. 4, a pump unit mounting hole 16 is formed in the tank upper portion 11 for taking in and out a fuel pump (not shown) and the like. After the fuel pump (not shown) is mounted in the fuel tank 10 from the pump unit mounting hole 16, the pump unit mounting hole 16 can be closed by the pump unit mounting lid 17.

  Further, an inlet pipe connecting portion 14 connected to an inlet pipe (not shown) for injecting fuel into the fuel tank 10 from a fuel filler port (not shown) provided in the vehicle body is provided in the tank upper portion 11 of the fuel tank 10. Installed. A fuel pipe 15 for sending fuel from the fuel pump to the engine is also attached. Furthermore, an electric cord for driving the fuel pump and various pipes for adjusting the evaporated fuel in the fuel tank 10 are attached.

As shown in FIG. 1, the tank side portion 12 and the tank bottom portion 13 of the fuel tank 10 are covered by a cover member 21 described later. In the present invention, only the tank bottom portion 13 may be covered, or the entire tank side portion 12, tank bottom portion 13, and tank upper portion 11 may be covered.
The tank upper portion 11 is formed with a tank upper recessed portion 11 a that is recessed toward the inside of the fuel tank 10. A plurality of tank upper recesses 11a can be provided. For this reason, the rigidity of the fuel tank 10 can be increased, and the fuel tank 10 can be prevented from being deformed when the internal pressure of the fuel tank 10 fluctuates.

  A tank bottom recess 13 a that is recessed toward the inside of the fuel tank 10 is formed in the tank bottom 13. A plurality of tank bottom recesses 13a can be provided. For this reason, the rigidity of the fuel tank 10 can be increased, and the fuel oil inside the fuel tank 10 can be prevented from flowing or undulating during traveling of the automobile.

Although the fuel tank 10 is made of metal or synthetic resin, any fuel tank 10 can be used in the present invention.
In the case of the metal fuel tank 10, steel or stainless steel can be used. The metal fuel tank 10 can be formed integrally by forming an upper shell and a lower shell separately and welding the flanges of both.

In the case of the fuel tank 10 made of synthetic resin, the fuel tank 10 is formed of high-density polyethylene (HDPE), a layer of high-density polyethylene (HDPE), or a multilayer structure of a skin layer, a barrier layer, and a main body layer. Can be used. In the case of a multilayer structure, the skin layer and the main body layer are formed from a thermoplastic synthetic resin that has high impact resistance and maintains rigidity against fuel oil, and may be formed from high-density polyethylene (HDPE). preferable. As the thermoplastic synthetic resin constituting the barrier layer, for example, ethylene vinyl alcohol copolymer (EVOH), polybutylene terephthalate, polyphenylene sulfide (PPS) or the like is preferably used.
The fuel tank 10 can be integrally formed by blow molding. Further, the upper shell and the lower shell can be separately molded by injection molding, and then the flanges of both can be welded to each other.

  Next, the tank heat insulating part 20 that wraps and insulates the fuel tank 10 will be described with reference to FIGS. The tank heat insulating portion 20 includes a cover member 21 that covers the fuel tank 10 and foam beads 27 that are synthetic resin foam small spherical bodies filled between the fuel tank 10 and the cover member 21.

  In the present embodiment, the cover member 21 is formed according to the outer shape of the fuel tank 10, and includes a cover member side portion 22 that covers the side surface of the fuel tank 10 and a cover member bottom portion 23 that covers the entire bottom surface of the fuel tank 10. It is integrally formed. In the present embodiment, the cover member 21 is not formed in the portion corresponding to the tank upper portion 11 of the fuel tank 10, but when increasing the heat insulation of the fuel tank 10, the cover member 21 is attached to the tank upper portion 11. It may be provided to cover substantially the entire surface of the fuel tank 10. Further, the cover member 21 may cover only the bottom surface of the fuel tank 10.

  The cover member 21 has a plurality of holes smaller than the diameter of the foam beads 27 which are synthetic resin foam small spherical bodies to be described later. As a result, the air used for blowing the foam beads 27 when the foam beads 27 are filled between the fuel tank 10 and the cover member 21 can be discharged from the small holes, and the foam beads 27 are uniformly distributed in the fuel tank 10. And the cover member 21 can be filled. Further, after filling the foam beads 27, heating steam or the like is blown from the cover member hole portion 24 provided in the cover member 21 so that the foam beads 27 are fused or an adhesive is blown to bond them. Air, adhesive solvent and air can be discharged.

  A plurality of support members that contact the fuel tank 10 and the cover member 21 can be provided between the cover member 21 and the fuel tank 10. This support member may form a protrusion from the cover member 21 or may be provided with a support as a separate member. With this support member, the gap between the fuel tank 10 and the cover member 21 can be kept at a predetermined size, and the foamed beads 27 can be filled in the gap and arranged uniformly. The formed heat insulation layer can be arranged uniformly.

It is preferable to provide a gap of about 5 to 15 mm between the cover member 21 and the fuel tank 10. If the thickness is less than 5 mm, the foamed bead 27 layer becomes thin and a sufficient heat insulating effect cannot be obtained. If the thickness exceeds 15 mm, the entire volume increases and may interfere with other members of the vehicle body. There is.
If the support member is fixed to the cover member 21 and the fuel tank 10, the cover member 21 is not displaced from the fuel tank 10, and the cover member 21 is securely held.

  The cover member 21 can be formed by injection molding a synthetic resin such as polypropylene or polyethylene, or can be formed by vacuum molding a sheet of synthetic resin such as polypropylene or polyethylene. Since the cover member 21 is formed by injection molding or vacuum molding, its shape can be freely formed so as to cover the fuel tank 10, and the gap between the cover member 21 and the fuel tank 10 can be made constant. The foam beads 27 described later can be filled evenly to improve the heat insulation effect.

  The cover member 21 can be formed of glass fiber or non-woven fabric and compression-molded so as to cover the fuel tank 10. Also in this case, the cover member 21 can be formed by compression-molding a glass fiber or non-woven sheet material in accordance with the shape of the fuel tank 10. For this reason, like the synthetic resin, the gap between the cover member 21 and the fuel tank 10 can be made constant, and the heat insulation effect can be improved. In the case of forming with glass fiber or non-woven fabric, both the materials themselves have small holes (voids), so that air when filling the foam beads 27 can be released.

  A plurality of cover member hole portions 24 are formed in the cover member 21. The cover member hole 24 is filled with foam beads 27 between the fuel tank 10 and the cover member 21, and then heated steam or the like is blown from the cover member hole 24 of the cover member 21, as described in the manufacturing method described later. In order to allow the foamed beads 27 to be fused or to be bonded by blowing an adhesive, it is a hole into which the nozzle is inserted.

  A seal member 26 is provided between the cover member end portion 25, which is the tip of the cover member 21, and the tank side portion 12. In the present embodiment, the seal member 26 is provided so as to contact the tank side portion 12. Since the sealing member 26 is provided, when the foam beads 27, which are synthetic resin foam small spherical bodies described later, are filled between the cover member 21 and the fuel tank 10, and when the foam beads 27 are bonded or welded after filling. In addition, the foam beads 27 can be prevented from spilling out from the cover member end portion 25. In addition, after the fuel tank 10 is attached to the vehicle body, it is possible to prevent rainwater or dust from entering between the cover member 21 and the fuel tank 10 and lowering the heat insulation.

  The seal member 26 is preferably formed of a sponge material, a double-sided adhesive tape, or an adhesive. As the sponge material, polyethylene foam or EPDM foam can be used. When the seal member 26 is a sponge material, when the cover member end portion 25 is pressed against the tank side portion 12, the sponge material seal member 26 flexes flexibly according to the unevenness of the tank side portion 12 and contacts the tank side portion 12. The gap between the tank side portion 12 and the cover member end portion 25 can be closed, and the heat insulation effect can be improved. In the case of a sponge material, air when filling the foam beads 27 can be released. For this reason, the foamed beads 27 can be reliably filled up to the cover member end portion 25.

  When the seal member 26 is a double-sided adhesive tape, the double-sided adhesive tape is easily bonded to the tank side portion 12 simply by pressing the tip of the cover member end portion 25 against the tank side portion 12. It can adhere | attach and it can attach easily and can contact | adhere between the cover member edge part 25 and the tank side part 12, and can improve the heat insulation effect. Furthermore, when the double-sided adhesive tape is formed thick with a sponge material, the gap between the tank side portion 12 and the cover member end portion 25 can be closed, and the heat insulation effect can be improved.

  When the seal member 26 is an adhesive, the tank side portion 12 and the cover member end portion 25 can be adhered only by pressing the adhesive at the cover member end portion 25 against the tank side portion 12. For this reason, between the tank side part 12 and the cover member edge part 25 can be stuck, and the heat insulation effect can be improved.

Next, the foam beads 27 which are synthetic resin foam small spherical bodies will be described.
The foam beads 27 can be formed of a foamed small spherical body made of a synthetic resin such as polypropylene, polyethylene, or polystyrene. In this case, it is excellent in durability and heat insulation can be maintained even during long-term use. Further, the foam beads 27 can be lightened, which can contribute to the weight reduction of the automobile.

  The foam beads 27 are preferably formed with a diameter of 1 to 5 mm. The expansion ratio of the expanded beads 27 is preferably about 10 to 50 times. In this case, according to the shape of the fuel tank 10, the foam bead 27 can be reliably filled into the tank bottom recess 13a and the like, and good heat insulation can be obtained. Further, when the foam beads 27 are filled between the fuel tank 10 and the cover member 21, the nozzle opening for ejecting the foam beads 27 is not large, and the filling operation is easy. When the diameter of the expanded beads 27 is less than 1 mm, the heat insulating effect is small and the handling is inconvenient.

  Further, when the diameter of the foam beads 27 exceeds 5 mm, the foam beads 27 may not be evenly and reliably filled in the concave portions of the ends, and the nozzle mouth becomes large and filling takes time. Since the foam beads 27 are foamed before filling, a foaming step after filling is not necessary, and production efficiency is good and easy. When the expansion ratio is less than 10, the heat insulating property is small and the weight is heavy, and when it exceeds 50, the strength of the expanded beads 27 is decreased and the durability is lowered.

Next, a method of filling the foam beads 27 between the fuel tank 10 and the cover member 21 will be described with reference to FIGS.
First, as shown in FIG. 1, the cover member 21 is attached so as to cover the tank side portion 12 and the tank bottom portion 13 of the fuel tank 10 so as to have a predetermined gap. At this time, the cover member end portion 25 which is the tip portion of the cover member 21 is positioned on the outer surface of the tank side portion 12, and the seal member 26 is attached so as to close the gap between the cover member end portion 25 and the tank side portion 12. ing.

  As shown in FIG. 2, a nozzle hole is provided in a part of the seal member 26 so that the bead feeding nozzle 30 can be inserted. The beads feeding nozzle 30 is inserted into the nozzle hole, and the foam beads 27 are blown between the fuel tank 10 and the cover member 21 from the beads feeding nozzle 30 to be filled. Thereby, the foam beads 27 can surely enter the tank bottom recess 13a. At this time, since a plurality of holes smaller than the diameter of the foam beads 27 are formed in the cover member 21 as described above, the air used for blowing the foam beads 27 is discharged from the small holes and foamed. The beads 27 are filled evenly between the fuel tank 10 and the cover member 21.

  Thereafter, as shown in FIG. 3, the heating nozzle 31 is inserted into the plurality of cover member hole portions 24 provided in the cover member 21, and heated steam is blown into the foam beads 27. The heating steam is a temperature at which the surface of the expanded beads 27 can be melted and the expanded beads 27 can be welded together. For example, it is about 120 ° C. When this heated steam is blown, the foam beads 27 are welded together and can be integrated, and the fuel tank 10 is stably formed as a heat insulating layer for a long period of time after being used in an automobile. The tank 10 can be wrapped. The heated steam is discharged from a small hole provided in the cover member 21 in the same manner as when the foam beads 27 are filled.

  If the same material is used for the cover member 21, the outer layer of the fuel tank 10, and the foam bead 27, the foam bead 27 can be welded to the cover member 21 and the outer layer of the fuel tank 10 by heating steam. By fixing the welded foam beads 27, a stable heat insulating layer can be formed.

In place of the heating steam, the adhesive can be blown in a mist form. The foam beads 27 can be bonded and integrated by an adhesive. In this case, the foamed beads 27 are not heated compared to the heating steam, and the shape of the foamed beads 27 is not deformed.
Also, the foam beads 27 can be adhered by applying an adhesive to the surface of the cover member 21 and the surface of the outer layer of the fuel tank 10.
Alternatively, the foamed beads 27 can be integrated by heating the surface of the cover member 21 instead of the heating steam to melt the foam beads 27. In this case, the cover member 21 needs to use a heat-resistant material. For example, metal or heat-resistant glass wool.

Next, a state where the fuel tank 10 is attached to the vehicle body will be described.
The fuel tank 10 is fixed to the vehicle body with a belt or the like. At that time, the tank upper portion 11 of the fuel tank 10 contacts the floor panel of the vehicle body, and the tank bottom portion 13 may be close to the exhaust pipe of the vehicle body. It is possible to prevent the temperature from becoming high. Further, the cover member 21 protects the fuel tank 10 and can protect the fuel tank 10 from flying stones or the like.
In order to further increase the heat insulation effect, the tank upper portion 11 can also be covered with the cover member 21.

DESCRIPTION OF SYMBOLS 10 Fuel tank 20 Tank heat insulation part 21 Cover member 25 Cover member edge part 26 Seal member 27 Foam bead (synthetic resin foam small spherical body)

Claims (10)

In automobile fuel tanks attached to automobiles,
At least a bottom portion of the fuel tank is covered with a cover member, and a gap is formed between the cover member and the fuel tank, and the gap is filled with a synthetic resin foam small spherical body, and the synthetic resin foam small spherical body Is a fuel tank for automobiles which is bonded or welded to each other after filling.   The automobile fuel tank according to claim 1, wherein the synthetic resin foamed small spherical body is a foamed small spherical body of polypropylene, polyethylene, or polystyrene.   The automobile fuel tank according to claim 1 or 2, wherein the synthetic resin foamed small spherical body has a diameter of 1 to 5 mm.   4. The fuel tank for an automobile according to claim 1, wherein the cover member has a plurality of holes smaller than a diameter of the synthetic resin foam small spherical body.   5. The fuel tank for an automobile according to claim 1, wherein the cover member covers a side part or a side part and an upper part in addition to the bottom part of the fuel tank. 6.   The fuel tank for automobiles according to any one of claims 1 to 5, wherein a plurality of support members that contact the fuel tank and the cover member are provided between the cover member and the fuel tank.   7. The cover member according to claim 1, wherein the cover member is formed of a synthetic resin and is formed by injection molding or vacuum molding in accordance with the shape of the fuel tank so as to cover the fuel tank. The fuel tank for automobiles as described.   The cover member according to any one of claims 1 to 6, wherein the cover member is formed of glass fiber or non-woven fabric and is compression-molded in accordance with the shape of the fuel tank so as to cover the fuel tank. The fuel tank for automobiles as described.   The automobile fuel tank according to any one of claims 1 to 8, wherein a seal member is fitted between a front end of the cover member and the fuel tank.   The fuel tank for an automobile according to claim 9, wherein the seal member is a sponge material, a double-sided adhesive tape, or an adhesive.

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