JP2014084054A - Attachment structure of fuel tank for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a fuel tank for a vehicle which enables easy manufacturing and attachment and reduces transmission of fuel swing noise to the interior of the vehicle without increasing the number of components.SOLUTION: In an attachment structure of a fuel tank for a vehicle which is attached to an area below a floor panel 1 of the vehicle, multiple planar tank upper part contact parts 20 are provided on an upper surface of the fuel tank. An irregular part is formed at each tank upper part contact part 20 to reduce a contact area between the tank upper part contact part 20 and a cushioning member 30.

Description

  The present invention relates to a mounting structure for a fuel tank for an automobile that is attached under the floor panel of the automobile.

  Conventionally, as shown in FIG. 8, a fuel tank 110 for an automobile is often attached under a floor panel 101 due to space. In this case, the fuel tank 110 is fixed to the floor panel 101 by a tank band 150 for attachment via a rubber pad as the buffer member 130 (see, for example, Patent Document 1).

  At this time, since the fuel is injected into the fuel tank 110, the fuel in the fuel tank 110 oscillates especially during acceleration, deceleration, corner rotation, and the like when the automobile is running. Due to this swinging, the outer wall of the tank vibrates and is transmitted to the inside of the automobile through the floor panel 101 when the automobile is stopped, causing a problem as a flowing sound. Therefore, it is desired to reduce the vibration transmission of the tank surface due to fuel oscillation.

In order to reduce this flow noise, attempts have been made to prevent the vibration of the fuel tank 110 by firmly fixing the fuel tank 110.
Therefore, as shown in FIG. 8, a first cross member 105 and a second cross member 106 are provided on the floor panel 101, and a mounting bracket 107 is attached to the first cross member 105, and the mounting bracket 107 and the second cross member are attached. The member 106 is fixed by the tank band 150 for attachment, and the fuel tank 110 is attached to the attachment bracket 107 so as to be pressed through the buffer member 131 while the reinforcing plate 108 is attached.

JP 2012-30725 A

  However, in this case, it is necessary to increase the rigidity of the mounting bracket 107 with which the fuel tank 110 abuts so that the fuel tank 110 does not vibrate, and the mounting bracket 107 welds the reinforcing plate 108. For this reason, it takes time and effort to attach the mounting bracket 107 and the reinforcing plate 108, the number of parts increases, the cost increases, and the weight of the vehicle increases, which is against the request for weight reduction of the vehicle.

  An object of the present invention is to provide a fuel tank mounting structure for an automobile that is easy to manufacture and mount, and that can reduce the transmission of flowing sound into the vehicle without increasing the number of parts.

The present invention of claim 1 for solving the above-described problems is directed to a fuel tank mounting structure for a vehicle that is mounted under a vehicle floor panel.
A plurality of planar tank upper abutting portions facing the floor panel are provided on the upper surface of the fuel tank,
An automobile fuel tank mounting structure is characterized in that an uneven portion is formed in a tank upper contact portion to reduce a contact area with the tank upper contact portion.

  According to the first aspect of the present invention, in the fuel tank mounting structure for an automobile mounted under the floor panel of the automobile, a plurality of planar tank upper abutting portions facing the floor panel are provided on the upper surface of the fuel tank. . For this reason, the planar tank upper abutting portion can surely abut on a predetermined range below the floor panel, and the fuel tank can be stably held at a plurality of locations.

  Since the concave and convex portions are formed on the tank upper contact part to reduce the contact area with the tank upper contact part, even if the fuel inside the fuel tank generates a flow sound due to the start or deceleration of the automobile, the flow sound is generated. The area to be transmitted is reduced, and transmission from the outer surface of the fuel tank to the vehicle interior can be reduced, so that the flow noise does not bother when stopping.

  According to the second aspect of the present invention, the tank upper abutting portion has a tank inner projecting portion in which the vicinity of the center portion of the tank upper abutting portion is curved in the inner direction of the fuel tank. The fuel tank mounting structure for automobiles is formed in the vicinity of the front end portion so as to protrude inward from the outer wall of the fuel tank.

  In the second aspect of the present invention, the tank upper abutting portion has a tank inner protruding portion formed in the vicinity of the center portion of the tank upper abutting portion so as to curve toward the inside of the fuel tank. For this reason, while contacting the floor panel at the outer periphery of the tank upper contact portion, the contact area between the tank upper contact portion and the floor panel is reduced only at the portion of the tank internal protrusion, so that the flow noise is reduced. Transmission from the outer surface of the tank contact portion to the vehicle interior can be reduced.

  The vicinity of the front end of the tank internal protrusion was formed to protrude inward from the outer wall of the fuel tank. For this reason, even if the fuel inside the fuel tank swings due to the start or deceleration of the automobile, the fuel hits the internal protrusion of the tank, the fuel swinging direction is dispersed, and the vibration of the outer wall of the fuel tank is reduced. Flowing sound can also be reduced.

  The present invention of claim 3 is a fuel tank mounting structure for an automobile in which the cross section of the tank internal protrusion is substantially V-shaped.

  According to the third aspect of the present invention, since the cross section of the tank internal protrusion is formed in a substantially V shape, the fuel hits the tip of the substantially V shape and is finely dispersed, and the vibration of the tank surface is reduced. Further, since the rigidity of the tank surface is improved, the vibration of the outer wall of the tank is further reduced, and the flow noise can be reduced.

  The present invention of claim 4 is a fuel tank mounting structure for an automobile in which the cross section of the tank internal protrusion is formed in a substantially arc shape.

  In the present invention of claim 4, since the cross section of the tank internal protrusion is formed in a substantially arc shape, even if the fuel oscillating in the tank hits the outer wall of the tank, it may be along an arcuate curved surface. The flow noise can be reduced.

  According to a fifth aspect of the present invention, there is provided a fuel tank mounting structure for an automobile in which a plurality of columnar tank protrusions are formed outward from the tank upper contact portion at the tank upper contact portion.

  In the present invention of claim 5, since the plurality of columnar tank protrusions are formed outward from the tank upper contact part, the tank upper contact part contacts the floor panel with the plurality of columnar tank protrusions. At the same time, the area of the tip of the plurality of columnar tank protrusions can be reduced to reduce the contact area with the tank upper contact part, and the flow noise can be reduced from being transmitted from the outer surface of the fuel tank to the vehicle interior. it can.

  The present invention of claim 6 is a fuel tank mounting structure for an automobile in which a plurality of recesses are formed inward from the tank upper contact portion in the tank upper contact portion.

  In the present invention of claim 6, since the tank upper contact portion is formed with a plurality of recesses inward from the tank upper contact portion, the area of the tip of the tank protrusion is reduced by the plurality of recesses, and the tank It is possible to reduce the contact area with the upper abutting portion and reduce the transmission of the flow noise from the outer surface of the fuel tank to the vehicle interior.

  The present invention of claim 7 is a fuel tank mounting structure for an automobile in which a fine tank unevenness pattern is formed on the upper surface of the tank upper contact portion at the tank upper contact portion.

  In the present invention of claim 7, since the tank upper contact portion has a fine tank uneven pattern formed on the tank upper contact portion, the area of the tip of the tank protrusion is reduced by the fine uneven pattern, and the tank upper portion It is possible to reduce the contact area with the contact portion and reduce the transmission of the flow noise from the outer surface of the fuel tank to the vehicle interior.

  The present invention of claim 8 is a fuel tank mounting structure for automobiles in which a buffer member is mounted between the tank upper contact portion and the lower surface of the floor panel.

  In the present invention of claim 8, since the buffer member is attached between the tank upper portion contact portion and the lower surface of the floor panel, the fuel tank is not in direct contact with the floor panel, and the surface of the fuel tank is damaged by sliding friction. No noise is generated by sliding, and vibrations of the automobile are rarely transmitted to the fuel tank.

  According to a ninth aspect of the present invention, there is provided a fuel tank mounting structure for an automobile in which the fuel tank is mounted on a floor panel with a plurality of tank mounting belts.

  In the present invention of claim 9, since the fuel tank is attached to the floor panel with a plurality of tank attachment belts, the fuel tank can be stably held by the plurality of belt members according to the shape of the fuel tank. Because of the belt shape, the fuel tank can be reliably held by bending according to the shape of the fuel tank.

  According to a tenth aspect of the present invention, there is provided a fuel tank mounting structure for an automobile in which the fuel tank is made of metal or synthetic resin.

  In the present invention of claim 10, when the fuel tank is made of metal, the rigidity of the fuel tank can be increased, and the formation of the concave and convex portions of the tank upper contact portion can be performed simultaneously with the tank formation by pressing. Easy to do. When the fuel tank is made of a synthetic resin, the fuel tank can be lightened, and the uneven portion of the tank upper contact portion can be easily formed simultaneously with the tank formation by injection molding or blow molding.

  In the present invention, an uneven portion is formed in the tank upper contact portion to reduce the contact area with the tank upper contact portion, so that the area for transmitting the flow sound of fuel inside the fuel tank is reduced, and the fuel tank Transmission from the outer surface to the vehicle interior can be reduced.

It is a perspective view of the fuel tank used for this invention. It is sectional drawing of the state which attached the fuel tank which is embodiment of this invention to the floor panel. It is an expanded partial sectional view of the state where the tank upper part contact part of the fuel tank which is the 1st embodiment of the present invention, and the buffer member were attached to the floor panel. It is an expanded partial sectional view of the state where the tank upper part contact part and buffer member of the fuel tank which are the 2nd embodiment of the present invention were attached to the floor panel. It is an expanded partial sectional view of the state where the tank upper part contact part and buffer member of the fuel tank which are the 3rd embodiment of the present invention were attached to the floor panel. It is an expanded partial sectional view of the state which attached the tank upper part contact part of the fuel tank which is the 4th Embodiment of this invention, and the buffer member to the floor panel. It is an expanded partial sectional view of the state where the tank upper part contact part of the fuel tank which is the 6th embodiment of the present invention, and the buffer member were attached to the floor panel. It is sectional drawing of the state which attached the conventional fuel tank to the floor panel.

The mounting structure of the fuel tank 10 for automobiles according to the first to fifth embodiments of the present invention will be described with reference to FIGS.
As shown in FIG. 2, the fuel tank 10 is attached by fixing the band end portion 53 of the tank band 50 to the band attachment portion 2 provided on the floor panel 1 with the attachment screw 3. At this time, the fuel tank 10 may be directly attached with the tank band 50, or the tank side portion 12 and the tank bottom portion 13 of the fuel tank 10 may be covered with a heat insulating member 40 as shown in FIG.
Further, the tank band 50 can be directly attached to the floor panel 1 with a bolt without using the tank band 50.

  The tank upper portion 11 of the fuel tank 10 is in contact with the floor panel 1 at the tank upper contact portion 20. A plurality of tank upper contact portions 20 are formed on the tank upper portion 11 and are formed so as to slightly protrude from the surface of the tank upper portion 11 which is the outer wall surface of the fuel tank 10. The tank upper contact portion 20 can directly contact the floor panel 1. At this time, a planar tank contact surface 21 that contacts the lower surface of the floor panel 1 is formed on the upper surface of the tank upper contact portion 20.

Further, as shown in FIG. 2, a buffer member 30 may be provided between the lower surface of the floor panel 1 and the tank contact surface 21. In the drawings in the present embodiment, the case where the buffer member 30 is provided will be described below as an example, but the buffer member 30 may not be used.
The detailed shape of the tank upper contact portion 20 will be described later.

  As shown in FIG. 1, the fuel tank 10 used in the embodiment of the present invention has a pump unit mounting hole 16 formed on the upper surface so that a fuel pump (not shown) and the like can be taken in and out of the fuel tank 10. A pump unit mounting lid 17 for closing the pump unit mounting hole 16 and mounting the fuel pump in the fuel tank 10 is mounted.

  Further, the fuel tank 10 is provided with an inlet pipe connection 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. 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.

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.

  In the case of the fuel tank 10 made of a synthetic resin, one formed of a single layer of high density polyethylene (HDPE) or one formed of 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.

When the fuel tank 10 is made of metal, the rigidity of the fuel tank 10 can be increased, and the shape of the tank upper contact portion 20 and the formation of the concavo-convex portions of the tank contact surface 21 are also pressed by the press. Easy to do at the same time as forming the outer wall.
In the case where the fuel tank 10 is made of synthetic resin, the fuel tank 10 can be lightened, and the shape of the tank upper contact portion 20 and the uneven portion of the tank contact surface 21 can also be formed by injection molding or blow molding. This can be easily performed simultaneously with the formation of the outer wall of the fuel tank 10.

  The shape of the tank upper abutment portion 20 that abuts against the floor panel 1 and the formation of the uneven portion of the tank abutment surface 21 are the same for metal and synthetic resin. Taking the tank upper contact portion 20 as an example, first to fifth embodiments of the present invention will be described.

  First, a first embodiment of the present invention will be described with reference to FIG. In the first embodiment, the shape of the tank upper contact portion 20 is formed such that the central portion thereof is curved in the inner direction of the fuel tank 10 to form a tank internal protrusion 23. Therefore, the center of the outer surface of the tank upper contact portion 20 is recessed to form a tank recess 22.

  The cross section of the tank internal protrusion 23 is formed in a substantially V shape. For this reason, the fuel hits the substantially V-shaped tip and is finely dispersed, and the vibration of the outer wall of the tank is reduced. Further, the rigidity of the outer wall of the tank is improved, and further, the vibration of the tank surface is reduced and the flow noise can be reduced.

  Furthermore, the area of the tank abutment surface 21 is reduced only by the portion of the tank internal protrusion 23, the contact area between the tank abutment surface 21 and the back surface of the floor panel 1 is reduced, and the flow noise is reduced. Transmission from the outer surface to the vehicle interior can be reduced. In addition, since the outer peripheral portion of the tank contact surface 21 is in contact with the floor panel 1, the contacted portion is substantially the entire peripheral portion of the tank internal protrusion 23, and the tank upper contact portion 20 is stably provided. Is in contact with the floor panel 1.

  When the buffer member 30 is used, the contact area between the tank contact surface 21 and the buffer member 30 on the back surface of the floor panel 1 is reduced, and the flowing sound is transmitted from the outer surface of the fuel tank 10 through the buffer member 30. Thus, transmission to the vehicle interior can be reduced. The buffer member 30 may be an elastic body such as a rubber plate or a soft synthetic resin plate. In addition, since the outer peripheral portion of the tank contact surface 21 is in contact with the buffer member 30, the contacted portion is substantially the entire peripheral portion of the tank internal protrusion 23, and the tank upper contact portion 20 is stably provided. Is in contact with the floor panel 1 via the buffer member 30.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, similar to the first embodiment, the shape of the tank upper contact portion 20 is formed such that the central portion thereof is curved in the inner direction of the fuel tank 10 and protrudes inside the tank. Part 23 is formed. Therefore, the center of the outer surface of the tank upper contact portion 20 is recessed to form a tank recess 22.

  The cross section of the tank internal protrusion 23 is formed in a substantially arc shape. For this reason, even if the oscillating fuel hits the inner surface of the outer wall of the tank, the fuel can be poured along the inner surface of the substantially arc-shaped tank inner protrusion 23, and the flow noise can be reduced.

  Similarly to the first embodiment, the area of the tank contact surface 21 is reduced only in the portion of the tank internal protrusion 23, and the tank contact surface 21 and the buffer member 30 on the back surface of the floor panel 1 are reduced. By reducing the contact area, it is possible to reduce the flow noise transmitted from the outer surface of the fuel tank 10 to the vehicle interior via the buffer member 30. Similarly to the first embodiment, since the outer peripheral portion of the tank contact surface 21 is in contact with the buffer member 30, the contacted portion is substantially the entire peripheral portion of the tank internal protrusion 23. The tank upper contact portion 20 is stably in contact with the floor panel 1 via the buffer member 30.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, a plurality of columnar tank protrusions 24 are formed outward from the tank contact surface 21 on the tank contact surface 21 on the outer surface of the tank upper contact portion 20. The tank protrusion 24 can be formed in a columnar shape or a polygonal column shape. For this reason, only the front end surface of the tank projection 24 contacts the buffer member 30 on the back surface of the floor panel 1, and the contact area is reduced, so that the flow noise is transmitted from the outer surface of the fuel tank 10 through the buffer member 30. Thus, transmission to the vehicle interior can be reduced. Since the tank protrusion 24 is formed over substantially the entire surface of the tank contact surface 21, the tank upper contact portion 20 stably contacts the floor panel 1 via the buffer member 30.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the tank contact surface 21 on the outer surface of the tank upper contact portion 20 is formed with a plurality of tank recesses 22 inward from the tank contact surface 21. The tank recess 22 is a hole whose planar shape is formed in a circle or a polygon. For this reason, the area of the tank contact surface 21 is reduced by the amount of the tank recess 22 formed, and the contact area of the tank contact surface 21 that contacts the buffer member 30 on the back surface of the floor panel 1 is reduced. Transmission of the flow noise from the outer surface of the fuel tank 10 to the vehicle interior via the buffer member 30 can be reduced. Since the portion where the tank recess 22 is not formed exists over substantially the entire surface of the tank contact surface 21, the tank upper contact portion 20 stably contacts the floor panel 1 via the buffer member 30. Yes.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, a fine tank concavo-convex pattern 25 is formed on the tank contact surface 21 on the outer surface of the tank upper contact portion 20. The fine tank uneven pattern 25 is, for example, a texture pattern. The fine tank concavo-convex pattern 25 reduces the contact area of the tank abutment surface 21 of the tank upper abutment portion 20 with the buffer member 30 so that the flow noise is transmitted from the outer surface of the fuel tank 10 through the buffer member 30 to the vehicle interior. Can be reduced. The fine tank concavo-convex pattern 25 is formed over the entire surface of the tank contact surface 21, and the tank upper contact portion 20 stably contacts the floor panel 1 via the buffer member 30.

DESCRIPTION OF SYMBOLS 1 Floor panel 10 Fuel tank 20 Tank upper part contact part 21 Tank contact surface 22 Tank recessed part 23 Tank internal protrusion part 24 Tank protrusion part 25 Tank uneven | corrugated pattern 30 Buffer member 50 Tank band

Claims (10)

In the mounting structure of the fuel tank for automobiles attached under the floor panel of the automobile,
A plurality of planar tank upper contact portions facing the floor panel are provided on the upper surface of the fuel tank,
A fuel tank mounting structure for an automobile, wherein an uneven portion is formed in the tank upper contact portion to reduce a contact area with the tank upper contact portion.   The tank upper abutting portion has a tank internal protrusion formed in the vicinity of the center of the tank upper abutting portion so as to curve in the internal direction of the fuel tank, and the vicinity of the tip of the tank internal protrusion is The fuel tank mounting structure for an automobile according to claim 1, wherein the fuel tank mounting structure is formed so as to protrude inward from an outer wall of the fuel tank.   The fuel tank mounting structure for an automobile according to claim 2, wherein a cross section of the tank internal protrusion is formed in a substantially V shape.   The fuel tank mounting structure for an automobile according to claim 2, wherein a cross section of the tank internal protrusion is formed in a substantially arc shape.   The fuel tank mounting structure for an automobile according to claim 1, wherein the tank upper abutting portion is formed with a plurality of columnar tank protrusions outward from the tank upper abutting portion.   2. The fuel tank mounting structure for an automobile according to claim 1, wherein the tank upper contact portion is formed with a plurality of recesses inward from the tank upper contact portion.   The fuel tank mounting structure for an automobile according to claim 1, wherein the tank upper contact portion is formed with a fine uneven pattern on the tank upper contact portion.   The fuel tank mounting structure for an automobile according to any one of claims 1 to 7, wherein a buffer member is mounted between the tank upper contact portion and the lower surface of the floor panel.   The fuel tank mounting structure for an automobile according to any one of claims 1 to 8, wherein the fuel tank is mounted on the floor panel with a tank mounting belt or a bolt.   The fuel tank mounting structure for an automobile according to any one of claims 1 to 9, wherein the fuel tank is made of metal or synthetic resin.

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