JP5228941B2 - Vehicle fuel tank mounting structure - Google Patents

Description

  The present invention relates to a fuel tank mounting structure for a vehicle used in a vehicle such as an automobile.

  Patent Document 1 below discloses a fuel tank mounting structure for a vehicle used for a vehicle such as an automobile. Specifically, a floor cross (also referred to as a cross member) extending in the vehicle width direction and a reinforcing member surrounding the rear half of the fuel tank are connected via a frame member extending in the vehicle body front-rear direction. Yes.

Japanese Utility Model Publication No. 61-5273

  However, according to the above prior art, a bent portion in the vehicle front-rear direction is formed on the outer side in the vehicle width direction of the portion of the floor cross where the frame members are connected. Compared to other parts of the cross, the strength, rigidity, and deformation suppression characteristics at the time of a vehicle side collision are inferior. For this reason, there is room for improvement in the strength and rigidity of the bent portion of the floor cloth to which the fuel tank is attached, and the deformation suppression characteristics at the time of vehicle side collision.

  In consideration of the above-mentioned fact, the present invention can improve the strength and rigidity of the bent portion of the floor cloth to which the fuel tank is attached, and can improve the deformation suppression characteristics at the time of a vehicle side collision, and can be improved. Is the purpose.

The fuel tank mounting structure for a vehicle according to the first aspect of the present invention includes a pair of left and right skeleton members extending in the longitudinal direction of the vehicle body at both ends in the vehicle width direction at the lower part of the vehicle body, and spans between the pair of left and right skeleton members, A floor cloth having a bent portion that is bent in the vertical direction of the vehicle body at the middle of the direction , and a cross-sectional shape viewed from the longitudinal direction is open in the direction toward the floor cloth, and a pair of flanges for coupling at both ends in the vehicle width direction A bracket in which the pair of flanges are respectively coupled to a vehicle width direction outer side portion and a vehicle width direction inner side portion straddling the bent portion of the floor cloth, and the bracket And a fuel tank fixed to the floor cloth.

Therefore, the cross-sectional shape seen from the longitudinal direction of the bracket for fixing the fuel tank to the floor cloth spanned between the pair of left and right skeleton members is a cross-sectional hat shape in which the direction toward the floor cloth is opened. In addition, a pair of coupling flanges provided at both ends in the vehicle width direction of the bracket and spaced in the vehicle width direction straddle a bending portion that is bent in the vertical direction of the vehicle body formed in the longitudinal middle portion of the floor cloth. The vehicle width direction outer side portion and the vehicle width direction inner side portion are respectively coupled. For this reason, deformation of the bent portion of the floor cloth can be prevented or suppressed by the bracket. As a result, the strength and rigidity of the bent portion in the floor cloth to which the fuel tank is attached are improved, and the deformation suppressing characteristic at the time of a vehicle side collision is also improved. In addition, productivity is improved because the bracket structure is simple.

  According to a second aspect of the present invention, in the fuel tank mounting structure for a vehicle according to the first aspect, the floor cross forms a closed cross-section structure portion along a vehicle width direction, and the bracket is the closed cross-section structure portion. It is provided in the outer side of.

  Therefore, the floor cross forms a closed cross-section structure portion along the vehicle width direction, and the bracket is provided outside the closed cross-section structure portion, so that the bracket can be easily attached to the floor cross. As a result, the assembly workability is improved.

According to a third aspect of the present invention, in the fuel tank mounting structure for a vehicle according to the first or second aspect, the bracket has a wall portion along the outer periphery of the floor cloth between the pair of flanges . wherein the mounting portion of the fuel tank is formed in the wall portion.

Thus, the bracket has a wall portion along the outer periphery of the floor cross between a pair of flanges, because this mounting portion of the fuel tank is formed in the wall structure of the bracket is improved simple productivity .

As described above, the fuel tank mounting structure for a vehicle according to the first aspect of the present invention can improve the strength and rigidity of the bent portion in the floor cloth to which the fuel tank is attached, and suppress deformation at the time of a vehicle side collision. The characteristics can be improved. Further, the productivity of the bracket can be improved.

  The fuel tank mounting structure for a vehicle according to the second aspect of the present invention can improve the workability of assembling the fuel tank.

  Further, the fuel tank mounting structure for a vehicle according to the third aspect of the present invention can improve the productivity of the bracket.

FIG. 4 is an enlarged cross-sectional view taken along a 1-1 cross-sectional line in FIG. 3. FIG. 2 is an enlarged cross-sectional view taken along a line 2-2 in FIG. It is the top view seen from the vehicle body bottom which shows the fuel tank mounting structure of the vehicle which concerns on one Embodiment of this invention. 1 is a perspective view of a fuel tank mounting structure for a vehicle according to an embodiment of the present invention as seen from the obliquely rearward and outward lower side of a vehicle body. It is the perspective view seen from the vehicle body diagonal front which shows the bracket of the fuel tank mounting structure of the vehicle which concerns on other embodiment of this invention.

[Embodiment]

  Hereinafter, an embodiment of a fuel tank mounting structure for a vehicle according to the present invention will be described with reference to FIGS. In these drawings, an arrow UP appropriately shown indicates a vehicle body upward direction, an arrow FR indicates a vehicle body front direction, and an arrow IN indicates a vehicle width inside direction.

  First, the configuration of an automobile body to which the vehicle fuel tank mounting structure according to this embodiment is applied will be described, and then the main part will be described in detail.

  (Body structure)

  As shown in FIG. 3, rockers 12 as a pair of left and right skeleton members extend in the longitudinal direction of the vehicle body at both lower portions in the vehicle width direction of the vehicle interior 10 </ b> A of the vehicle body 10 in the present embodiment. In addition, a pair of left and right rear side members 14 extend in the longitudinal direction of the vehicle body at lower portions of both ends of the trunk room 10B in the vehicle body 10 in the vehicle width direction.

  The rear end portions 12 </ b> A of the pair of left and right rockers 12 are joined to both ends 16 </ b> A of the center floor cross 16 as a floor cross in the vehicle width direction, and the front end portions 14 </ b> A of the pair of left and right rear side members 14 are connected to the center floor cross 16. It couple | bonds with the vehicle width direction both ends 16A. Further, both end portions 18A of the rear floor cross 18 in the vehicle width direction are coupled to the middle portion 14B in the front-rear direction of the pair of left and right rear side members 14.

  As shown in FIG. 1, the rocker 12 includes a rocker outer 20 that constitutes an outer portion in the vehicle width direction of the rocker 12 and a rocker inner 22 that constitutes an inner portion in the vehicle width direction of the rocker 12. Forms a closed section structure portion 24 extending in the longitudinal direction of the vehicle body.

  As shown in FIG. 2, the center floor cloth 16 includes a rear end portion of the center floor cross panel 28 and a front end portion of the center floor panel 30.

  More specifically, a lower vertical wall portion 28B is formed from the rear end of the general portion 28A of the center floor cross panel 28 toward the upper rear side of the vehicle body, and from the upper end of the lower vertical wall portion 28B, Further, an inclined wall portion 28C that is inclined rearward of the vehicle body is formed. Further, a lateral wall portion 28D is formed from the rear end of the inclined wall portion 28C toward the rear of the vehicle body, and an upper vertical wall portion 28E is formed from the rear end of the lateral wall portion 28D toward the obliquely rearward upper side of the vehicle body. ing. Furthermore, a flange 28F is formed from the upper end of the upper vertical wall portion 28E toward the rear of the vehicle body.

  On the other hand, a vertical wall portion 30B is formed from the front end of the general portion 30A of the center floor panel 30 toward the vehicle body diagonally forward lower side, and further inclined from the lower end of the vertical wall portion 30B toward the vehicle body diagonally forward. The flange 30C is formed. The flange 30C of the center floor panel 30 is coupled to the upper surface of the inclined wall portion 28C of the center floor cross panel 28, and the flange 28F of the center floor cross panel 28 is connected to the lower surface of the general portion 30A of the center floor panel 30. Are combined. As a result, the center floor cross 16 is formed by the rear end portion of the center floor cross panel 28 and the front end portion of the center floor panel 30, and the center floor cross 16 has a closed cross-section structure portion 32 extending in the vehicle width direction. Forming.

  Note that a rear suspension (not shown) is supported on the center floor cloth 16.

  (Configuration of fuel tank mounting part)

  As shown in FIG. 3, in the present embodiment, the fuel tank 36 is disposed between the center floor cloth 16 and the rear floor cloth 18, and the front mounting portion 36 </ b> A of the fuel tank 36 has a pair of left and right brackets 40. It is attached to the center floor cloth 16 via

  As shown in FIG. 2, the bracket 40 is provided outside the closed cross-section structure portion 32. On the lower surface side of the center floor cross panel 28, the lower vertical wall portion 28B, the inclined wall portion 28C, the horizontal wall portion 28D, It is arranged in a long shape along the wall portion 28E.

  As shown in FIG. 4, the bracket 40 has a hat cross-sectional shape in which the cross-sectional shape viewed from the longitudinal direction (longitudinal direction) is open in the direction toward the center floor cross panel 28 and is easily manufactured by press working or the like. It is possible.

  More specifically, the bracket 40 includes the lower vertical wall portion 28B, the inclined wall portion 28C, the horizontal wall portion 28D, and the lower vertical wall portion 40A that are opposed in parallel to the upper vertical wall portion 28E and the inclined wall. A portion 40B, a horizontal wall portion 40C, and an upper vertical wall portion 40D are provided. Further, at the vehicle width direction outer side end portion of the bracket 40, there are a vertical wall portion 40E directed from the lower vertical wall portion 40A, the inclined wall portion 40B, the horizontal wall portion 40C, the upper vertical wall portion 40D to the center floor cross panel 28, and the vertical wall portion 40E. A flange 40F is formed as a coupling portion extending from the front end of the wall portion 40E toward the outside in the vehicle width direction. On the other hand, on the inner end in the vehicle width direction of the bracket 40, there are a vertical wall portion 40G directed from the lower vertical wall portion 40A, the inclined wall portion 40B, the horizontal wall portion 40C, the upper vertical wall portion 40D to the center floor cross panel 28, and the vertical wall portion 40G. A flange 40H is formed as a connecting portion extending inward in the vehicle width direction from the front end of the wall portion 40G. That is, the bracket 40 has a cross-sectional hat shape in which flanges 40F and 40H for coupling are formed at both ends in the vehicle width direction.

  As shown in FIG. 1, a pair of left and right bent portions 16 </ b> B (bend points P <b> 1) are formed in the vehicle floor direction intermediate portion of the center floor cloth 16.

  More specifically, the center floor cross 16 has a central portion 16C extending horizontally in the vehicle width direction between the pair of left and right bent portions 16B, and the vehicle width direction outer side of the pair of left and right bent portions 16B The inclined portion 16D is inclined from the upper inside in the width direction to the lower outside in the vehicle width direction.

  Further, the flange 40F and the flange 40H of the bracket 40 are respectively coupled to each position of the center floor cloth 16 straddling the bent portion 16B of the center floor cloth 16.

  More specifically, as shown in FIG. 4, the flange 40 </ b> F of the bracket 40 is inclined to the lower vertical wall portion 28 </ b> B of the center floor cross panel 28 at a position outside the bent portion 16 </ b> B of the center floor cross 16 in the vehicle width direction. The wall portion 28C, the horizontal wall portion 28D, and the upper vertical wall portion 28E are coupled. On the other hand, the flange 40H of the bracket 40 has a lower vertical wall portion 28B, an inclined wall portion 28C, a horizontal wall portion 28D, and an upper vertical wall portion at a position inside the bent portion 16B of the center floor cloth 16 in the vehicle width direction. 28E.

  Therefore, the bracket 40 can prevent or suppress the deformation of the bent portion 16B of the center floor cloth 16.

  As shown in FIG. 2, the bracket 40 is provided outside the closed cross-section structure portion 32 of the center floor cloth 16, and when the bracket 40 is fixed to the center floor cloth 16, it is easy from the rear lower side of the vehicle body. It can be installed. A through hole 50 is formed in the lateral wall portion 40C of the bracket 40, and a nut 52 is fixed to the upper surface of the lateral wall portion 40C so as to be coaxial with the through hole 50. On the other hand, a through hole 54 is formed in the front mounting portion 36A of the fuel tank 36, and a bolt 56 inserted from the vehicle body lower side into the through hole 54 and the through hole 50 of the bracket 40 is screwed into the nut 52. By combining, the fuel tank 36 is fixed to the bracket 40. That is, the lateral wall portion 40 </ b> C of the bracket 40 is an attachment portion for the fuel tank 36.

  As shown in FIG. 3, the rear attachment portion 36 </ b> B of the fuel tank 36 is attached to the rear floor cloth 18 by a pair of left and right fastening members 50.

  Next, the operation and effect of this embodiment will be described.

  In this embodiment, flanges 40F and 40H spaced in the vehicle width direction are provided on the bracket 40 for fixing the front mounting portion 36A of the fuel tank 36 to the center floor cross 16 spanned between the pair of left and right rockers 12. One flange 40F is located on the outer side in the vehicle width direction from the bent portion 16B of the center floor cloth 16, and is provided with a lower vertical wall portion 28B, an inclined wall portion 28C, a horizontal wall portion 28D, and an upper vertical wall. It is coupled to the portion 28E. On the other hand, the other flange 40H has a lower vertical wall portion 28B, an inclined wall portion 28C, a horizontal wall portion 28D, and an upper vertical wall portion 28E on the center floor cross panel 28 at a position inside the bent portion 16B of the center floor cross 16 in the vehicle width direction. Is bound to.

  For this reason, the deformation of the bent portion 16B of the center floor cloth 16 can be prevented or suppressed by the bracket 40. As a result, the strength and rigidity of the bent portion 16B in the center floor cloth 16 to which the fuel tank 36 is attached are improved.

  Accordingly, the torsional deformation of the center floor cloth 16 caused by the input from the rear suspension can be suppressed, and the cross-sectional collapse of the closed cross-section structure portion 32 can be suppressed. As a result, it is possible to prevent breakage such as cracks at the joint between the inclined wall portion 28C of the center floor cross panel 28 and the flange 30C of the center floor panel 30. Moreover, the buckling deformation suppression characteristic of the center floor cloth 16 at the time of a side collision of the vehicle is also improved.

  In the present embodiment, the center floor cross 16 forms a closed cross-section structure portion 32 along the vehicle width direction, and a bracket 40 is provided outside the closed cross-section structure portion 32. Therefore, when the bracket 40 is fixed to the center floor cloth 16, it can be easily attached from the lower rear side of the vehicle body. As a result, the assembly workability is improved.

  In the present embodiment, the bracket 40 has a hat cross-sectional shape in which the cross-sectional shape viewed from the longitudinal direction (longitudinal direction) is open in the direction toward the center floor cross panel 28, and the lower vertical wall portion 40A is inclined. A vertical wall 40E and a flange 40F are formed at the outer end in the vehicle width direction of the wall 40B, the horizontal wall 40C, and the upper vertical wall 40D, and a vertical wall 40G and a flange 40H are formed at the inner end in the vehicle width direction. Yes. For this reason, the bracket 40 has a simple structure and can be easily manufactured by press working or the like. As a result, the productivity of the bracket 40 is improved.

  [Supplementary explanation of the above embodiment]

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, the shape of the bracket for attaching the fuel tank to the floor cloth is not limited to the shape of the above embodiment, and corresponds to the shape of the floor cloth different from that of the present embodiment as in the bracket 60 shown in FIG. The through hole 50 for attaching the fuel tank may be formed in the bottom 60B of the recess 60A formed in the center of the bracket 60.

  In the bracket 60 shown in FIG. 5, an upper flange 60C is formed on the upper side of the recess 60A, and a lower flange 60D is formed on the lower side of the recess 60A. Both end portions of these flanges 60C and 60D in the vehicle width direction are formed. Are connected to each position across the bent portion of the floor cloth as a connecting portion, and flanges 60E and 60F formed at both ends in the vehicle width direction of the recess 60A are also connected to the bent portions of the floor cross as connecting portions. Each is connected to a position.

  In the above embodiment, the present invention is applied to the center floor cloth 16 spanned over the rocker 12 as the skeleton member. However, the present invention is applicable to a floor cross spanned over other skeleton members such as the pair of left and right rear side members 14. The present invention may be applied when a bent portion exists.

  In the above embodiment, the center floor cloth 16 as the floor cloth is constituted by the center floor cloth panel 28 and the center floor panel 30. However, the floor cloth is not a combination of plate materials but may have other structures such as a cross member. Good. Further, the floor cloth is not limited to a closed cross-sectional structure.

10 Car body 12 Rocker (frame member)
14 Rear side member (frame member)
16 Center floor cloth (floor cloth)
16B Bending portion of center floor cross 18 Rear floor cross 28 Center floor cross panel 30 Center floor panel 32 Closed cross-section structure portion of center floor cross 36 Fuel tank 40 Bracket 40C Bracket side wall portion (fuel tank mounting portion)
40F Bracket flange (joint)
40H Bracket flange (joint)
60 Bracket

Claims (3)

A pair of left and right skeleton members extending in the longitudinal direction of the vehicle body at both ends in the vehicle width direction at the bottom of the vehicle body;
A floor cloth that is stretched over the pair of left and right skeleton members and has a bent portion that is bent in the vertical direction of the vehicle body at the middle in the longitudinal direction;
The cross-sectional shape viewed from the longitudinal direction is open in the direction toward the floor cloth, and has a cross-sectional hat shape in which a pair of flanges for coupling are formed at both ends in the vehicle width direction . Brackets respectively coupled to the vehicle width direction outer side part and the vehicle width direction inner side part across the bent part,
A fuel tank fixed to the floor cloth via the bracket;
A fuel tank mounting structure for a vehicle.   2. The fuel tank for a vehicle according to claim 1, wherein the floor cross forms a closed cross-section structure portion along a vehicle width direction, and the bracket is provided outside the closed cross-section structure portion. Mounting structure. The bracket has a wall portion along the outer periphery of the floor cross between the pair of flanges, claims, characterized in that the mounting portion of the fuel tank to the wall portion is formed 1 or claim 2 2. A fuel tank mounting structure for a vehicle according to 1.

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