JP3855891B2 - Body floor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body floor structure in which a fuel tank is installed below a floor panel.
[0002]
[Prior art]
In general, a fuel tank of a vehicle is installed on the lower side of a floor panel. A bulge that protrudes into a cabin is formed on a floor panel below a front seat such as a driver's seat or a passenger seat. A vehicle body floor structure has been proposed in which at least a part of a fuel tank is accommodated (see, for example, Patent Document 1).
[0003]
In this case, the fuel tank is protected by an underfloor reinforcing member attached to the lower surface of the floor panel, and the underfloor reinforcing member surrounds the front, rear, left, and right sides of the fuel tank.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-85382
[Problems to be solved by the invention]
However, in such a conventional vehicle body floor structure, the space inside the cabin of the rear seat can be expanded by arranging the fuel tank on the front seat side. In order to improve the vehicle performance, the fuel tank is arranged only on one side in the vehicle width direction of the front seat, while the floor surface on the other side in the vehicle width direction where the fuel tank is not arranged is pushed down and arranged. The cabin space on the other side in the width direction can be expanded.
[0006]
When the fuel tank is arranged on one side in the vehicle width direction in this way, in order to reduce the impact force acting on the fuel tank at the time of a side collision, the underfloor reinforcement member surrounding the front, rear, left and right of this fuel tank It is necessary to provide a deformation space that is crushed by the input of a collision load in the outer portion to absorb the collision energy. This crushed space necessitates downsizing of the fuel tank, and a sufficient tank capacity cannot be secured.
[0007]
Accordingly, the present invention provides a vehicle body floor structure that can secure the capacity of a fuel tank while allowing deformation during a side collision even when the fuel tank is disposed on one side in the vehicle width direction and protected by a reinforcing member. To do.
[0008]
[Means for Solving the Problems]
In the present invention, when the fuel tank is installed on the lower side of the floor panel, a bulging portion for housing the fuel tank is formed in a portion offset to one side of the floor panel in the vehicle width direction. A cross member is arranged on the upper surface along the bulging shape in the vehicle width direction, both ends of the cross member are coupled to the left and right side sills, and the fuel tank is stored in the bulging portion. The tank is connected to a portion corresponding to the cross member, and the cross member is composed of a plurality of members arranged in parallel and facing each other in an appropriate interval in the longitudinal direction of the vehicle body of the bulge portion. It is characterized in that it is connected at the formation part .
[0009]
【The invention's effect】
According to the present invention, the bulging portion is formed at a portion of the floor panel that is biased toward one side in the vehicle width direction, and the fuel tank is arranged only on one side in the vehicle width direction, so that the fuel tank is not arranged. It becomes possible to push down the floor surface on the side, and the cabin space at that portion can be expanded.
[0010]
When a load due to a side collision is input from one side in the vehicle width direction where the fuel tank is installed, the part corresponding to the bulging portion is pressed against the other side in the vehicle width direction as the side sill is deformed in the same direction. The impact energy can be absorbed by the deformation of the cross member.
[0011]
Further, when the portion corresponding to the bulging portion of the cross member is deformed, the fuel tank connected to the portion can move together and escape from the collision direction, so that the space between the fuel tank and the side sill can be reduced. Therefore, the capacity of the fuel tank can be increased accordingly.
In addition, the cross member is composed of a plurality of members arranged in parallel and facing each other at an appropriate interval in the longitudinal direction of the vehicle body of the bulging portion, and each member is connected by a portion where the bulging portion is formed. When the cross member is deformed along with the deformation, the collision input is transmitted substantially evenly to the members connected to each other, and these members can be evenly displaced synchronously. The fuel tank coupled to the cross member can be effectively escaped from the side member at the time of a side collision in the direction along the width direction.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
1 to 7 show an embodiment of a vehicle body floor structure according to the present invention, FIG. 1 is a perspective view showing a main part of the vehicle body floor, and FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 3 is an enlarged view of a portion B in FIG. 2, FIG. 4 is an enlarged plan view showing a portion corresponding to the bulging portion of the tunnel member, and FIG. 5 is a view showing a deformed state when a side collision occurs on the fuel tank arrangement side. FIG. 6 is a plan view of the main part of the vehicle body floor showing a deformed state when a side collision occurs on the fuel tank arrangement side, and FIG. 7 is a side collision on the side opposite to the fuel tank arrangement side. It is sectional drawing corresponding to FIG. 2 which shows the deformation | transformation state.
[0014]
The vehicle body floor structure of the present embodiment is applied to a floor panel 10 in a front seat portion where a driver's seat and a passenger seat (not shown) are provided, as shown in FIG. Side sills 11 and 12 are arranged in the longitudinal direction of the vehicle body (the left side is the front in the figure), and both right and left side sills 11 and 12 are connected to both side portions of the floor panel 10 by spot welding.
[0015]
Further, a tunnel portion 13 that runs in the longitudinal direction of the vehicle body is provided at the vehicle width direction center portion of the floor panel 10, and a pair of first and second tunnel members 14, 15 are provided on both right and left sides of the tunnel portion 13. Are combined and reinforced.
[0016]
Accordingly, the floor panel 10 is constituted by a right panel 10a on the right side of the vehicle body, a left panel 10b on the left side of the vehicle body, and a central panel 10c covering the upper side of the tunnel portion 13 with the tunnel portion 13 as a boundary.
[0017]
A bulging portion 20 that protrudes into the cabin as shown in FIG. 2 is formed at one side of the floor panel 10 in the vehicle width direction, that is, in the present embodiment, the portion that is biased to the right side of the vehicle body that is the driver's seat side outside the figure. The fuel tank T is stored below the bulging portion 20.
[0018]
The bulging portion 20 is formed by continuously bulging a lower right panel 10a and a higher central panel 10c with a height substantially equal to the side sill 11, and is inclined forward to the right panel 10a and the central panel 10c. By providing the wall 21, the top wall 22, and the rear inclined wall 23, it is bulged and formed into a cross-sectional shape that is substantially trapezoidal in the longitudinal direction of the vehicle body.
[0019]
Further, the vehicle width direction center side end portion of the bulging portion 20 is closed by a step wall 24 as a step portion rising along the inside of the second tunnel member 15.
[0020]
On the upper surface of the floor panel 10, as shown in FIG. 1, a cross member 30 is disposed in the vehicle width direction along the bulging shape of the bulging portion 20, and both ends of the cross member 30 are placed on the right and left sides. 2, and in a state where the fuel tank T is housed in the bulging portion 20 as shown in FIG. 2, the fuel tank T is attached to the formation portion of the bulging portion 20 via the mounting bracket K. And connected to a portion corresponding to the cross member 30.
[0021]
The cross member 30 is composed of two front cross members 31 and a rear cross member 32 which are arranged in parallel to face the front and rear side edges of the top wall 22 of the bulging portion 20. Are connected to a portion where the bulging portion 20 is formed via a central member 14b described later.
[0022]
The front and rear cross members 31, 32 form upper bent portions 31 a, 32 a at the ridge line 24 a portion formed on the upper side of the stepped wall 24 of the bulging portion 20, and are arranged at the lower side portion of the stepped wall 24. Lower bent portions 31b and 32b are formed at the second tunnel member 15 and are arranged from the top wall 22 along the upper surface of the left panel 10b.
[0023]
Then, the right end portions of the front and rear cross members 31 and 32 are coupled to the upper end of the right side sill 11, and the left end portions of the front and rear cross members 31 and 32 are connected to the lower end portion of the left side sill 12. It is connected inside.
[0024]
Further, as shown in FIGS. 2 and 3, a circular notch 33 as a fragile portion is formed in the front and rear direction on the lower side in the vicinity of the upper bent portions 31a and 32a, and the upper side in the vicinity of the lower bent portions 31b and 32b. A concave bead 34 as a fragile portion is formed in the front-rear direction, and the rigidity in the vehicle width direction of the front and rear cross members 31, 32 is lowered by the circular notch 33 and the concave bead 34.
[0025]
Further, the front and rear cross members 31 and 32 arranged in the vehicle width direction divide the first and second tunnel members 14 and 15 at the respective arrangement portions, and the divided first and second tunnel members. 14 and 15 are divided into front members 14a and 15a, central members 14b and 15b, and rear members 14c and 15c, and their respective cross sections are welded and integrated with the front and rear side surfaces of the front and rear cross members 31 and 32, respectively. .
[0026]
On the other hand, the first tunnel member 14 crosses the bulging portion 20 in the front-rear direction, and the front portion of the bulging portion 20 is the lower end portion of the front inclined wall 21 of the bulging portion 20 from the front to the rear. While forming the downward bending part 14d, it inclines along this front inclination wall 21, and forms the connection part 14e with the front cross member 31. As shown in FIG.
[0027]
Further, in the rear portion of the bulging portion 20, the lower bent portion 14 g is formed at the lower end portion of the rear inclined wall 23 of the bulging portion 20 from the rear to the front, and is inclined along the rear inclined wall 23. A connecting portion 14f with the rear cross member 32 is formed.
[0028]
Then, as shown in FIG. 4, concave beads 16 are formed in the vicinity of the downward bent portions 14 d and 14 g and the coupling portions 14 e and 14 f, respectively, and these concave beads 16 make the first tunnel member 14 in the vehicle width direction. The rigidity is reduced.
[0029]
By the way, as shown in FIG. 2, the exhaust pipe P is routed in the tunnel portion 13 using the upper space portion of the tunnel portion 13, and in this embodiment, the vehicle width of the fuel tank T is set. A recessed portion 40 for disposing the exhaust pipe P is formed in the side portion T1 on the inner side in the direction.
[0030]
In the vehicle body floor structure of the present embodiment having the above-described configuration, the bulging portion 20 is formed at a portion offset to the right side in the vehicle width direction of the floor panel 10 as shown in FIGS. By disposing the fuel tank T only below the driver's seat side, it is possible to push down the left side panel 10b surface on the passenger seat side where the fuel tank T is not disposed, and to expand the cabin space of that portion. Can do.
[0031]
5 and 6, when a load F1 due to a side collision is input from the right side in the vehicle width direction where the fuel tank T is installed, as shown in the solid line position from the broken line position in FIGS. The side sill 11 on the right side in the same direction is deformed in a direction to be pushed inward in the vehicle width direction, and the front and rear cross members 31 and 32 correspond to the bulging portion 20 with the deformation, that is, the bulging portion. The portion disposed on the top wall 22 of 20 pushes the upper bent portions 31a and 32a and the lower bent portions 31b and 32b to the left in the vehicle width direction (left in FIG. 5) while bending and deforming them in an acute angle direction. The impact energy can be absorbed by the deformation of the front and rear cross members 31 and 32.
[0032]
In this way, when the front and rear cross members 31, 32 are deformed at the portion corresponding to the bulging portion 20, the fuel tank T is coupled to the portion via the connection bracket K as shown in FIG. This fuel tank T moves to the left in the vehicle width direction together with the front and rear cross members 31 and 32.
[0033]
In this way, when the side collision from the right side occurs, the fuel tank T moves so as to escape from the collision direction. Therefore, it is possible to avoid the interference between the side sill 11 and the fuel tank T which are deformed by the collision.
[0034]
Therefore, since the space between the side sill 11 and the fuel tank T can be reduced in the normal state, the capacity of the fuel tank T can be increased by that amount, and the space in the cabin can be expanded while increasing the space in the cabin. Necessary capacity can be secured.
[0035]
By the way, in the vehicle body floor structure of the first embodiment, in addition to the above-described functions and effects, the vicinity of the upper bent portions 31a and 32a formed on the front and rear cross members 31 and 32 and the lower bent portions 31b and 32b. Since the circular notch 33 and the recessed bead 34 for reducing the rigidity in the vehicle width direction are formed in the vicinity of the front side, the front and rear cross members 31 and 32 are connected to the upper bent portions 31a and 32a and the lower side at the time of a side collision from the right side. The fuel tank T can be moved in the direction of escaping from the collision direction by being reliably deformed by the bent portions 31b and 32b.
[0036]
Further, a cross member 30 is constituted by two front and rear cross members 31 and 32 which are arranged in parallel along the front and rear edges of the top wall 22 of the bulging portion 20 in parallel with each other. Since the swelled portion 20 is connected via the member 14b, when the cross member 30 is deformed along with the deformation of the side sill 11 due to the side collision, the collision input F1 is applied to the front and rear cross members 31, 32 before being connected to each other. Is transmitted substantially evenly so that the front and rear cross members 31 and 32 can be synchronously displaced in synchronism with each other. Therefore, the moving direction of the cross member 30 is set to a direction substantially along the vehicle width direction. The fuel tank T coupled to the cross member 30 can be effectively released from the side member 11 at the time of a side collision.
[0037]
Further, the first tunnel member 14 provided on the side of the tunnel portion 13 is formed with downward bent portions 14d and 14g along the bulging shape of the bulging portion 20, and the front and rear cross members 31, 32 are formed. Are formed and disposed, and in the vicinity of the downward bent portions 14d and 14g and in the vicinity of the joint portions 14e and 14f with the cross member, a concave bead 16 that reduces the rigidity in the vehicle width direction is provided. Are formed, so that the displacement of the first tunnel member 14 in the vehicle width direction can be promoted at the time of a side collision, and the inhibition of the displacement of the front and rear cross members 31, 32 in the vehicle width direction can be suppressed. The movement of the fuel tank T at the time can be performed more smoothly.
[0038]
Further, since the recessed portion 40 for disposing the exhaust pipe P is formed in the side portion T1 on the inner side in the vehicle width direction of the fuel tank T, as shown in FIG. When the load F2 is inputted, the front and rear cross members 31 and 32 are pushed inward in the vehicle width direction along the step wall 24 along with the deformation of the left side sill 12 along the upper surface of the left panel 10b. The front and rear cross members 31 and 32 are displaced in the direction of the fuel tank T, but the front and rear cross members 31 and 32 and the fuel tank T interfere with each other using the space of the recessed portion 40. Therefore, it is possible to prevent the capacity of the fuel tank T from being reduced.
[0039]
FIG. 8 is a front view of an essential part of a cross member showing another second embodiment of the present invention. The vehicle body floor structure of this embodiment has the front and rear cross members 31 and 32 divided into three parts, respectively. The part is used as a weak part.
[0040]
That is, in this embodiment, when the floor structure of the vehicle body is made of a lightweight metal material such as aluminum, the front and rear cross members 31 and 32 are formed with vertical portions 31c and 32c along the stepped wall 24 of the bulging portion 20. The upper horizontal portions 31d and 32d along the top wall 22 and the lower horizontal portions 31e and 32e along the left panel 10b are divided into three.
[0041]
The vertical portions 31c and 32c are formed of an aluminum alloy extruded material, and both end portions of the vertical portions 31c and 32c are inserted into the divided end portions of the upper horizontal portions 31d and 32d and the lower horizontal portions 31e and 32e. It fits with a margin, and each fitting part is couple | bonded by welding 17 and 17a, and this welding part is made into a weak part.
[0042]
Therefore, in this embodiment, the weight of the vehicle body can be reduced by adopting an aluminum floor structure, and when a load due to a side collision is input, the welded portions 17 and 17a at both ends of the vertical portions 31c and 32c are input. However, since it deform | transforms ahead of another part, the same function as the circular notch 33 and the recessed bead 34 which were shown to the said embodiment can be show | played.
[0043]
By the way, although the vehicle body floor structure of the present invention has been described by taking the above embodiments as examples, the present invention is not limited to these embodiments, and various other embodiments can be employed without departing from the gist of the present invention.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a vehicle body floor according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG.
FIG. 3 is an enlarged view of a portion B in FIG.
FIG. 4 is an enlarged plan view showing a portion corresponding to a bulging portion of the tunnel member in the first embodiment of the present invention.
FIG. 5 is a sectional view showing a deformed state when a side collision occurs on the fuel tank arrangement side in the first embodiment of the present invention.
FIG. 6 is a plan view of a main part of the vehicle body floor showing a deformed state when a side collision occurs on the fuel tank arrangement side in the first embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a deformed state when a side collision occurs on the side opposite to the fuel tank arrangement side in the first embodiment of the present invention.
FIG. 8 is a front view of an essential part of a cross member in a second embodiment of the present invention.
[Explanation of symbols]
10 Floor panel 11, 12 Side sill 13 Tunnel part 14 Tunnel member 14d, 14f Bending part 14e, 14g Joint part 16 Concave bead (fragile part)
17, 17a Welded part (fragile part)
20 bulged portion 30 cross member 31 front cross member 31a upper bent portion 31b lower bent portion 32 rear cross member 32a upper bent portion 32b lower bent portion 33 circular notch (fragile portion)
34 Concave bead (fragile part)
40 Recessed part T Fuel tank P Exhaust pipe

Claims (4)

A vehicle body floor structure in which a fuel tank is installed below the floor panel,
Forming a bulging part to store the fuel tank in the part offset to one side of the vehicle width direction of the floor panel,
A cross member is arranged in the vehicle width direction along the bulging shape on the upper surface of the bulging portion, and both ends of the cross member are coupled to the left and right side sills,
In a state where the fuel tank is stored in the bulging portion, the fuel tank is connected to a portion corresponding to the cross member ,
The cross member has a fragile portion that reduces the rigidity in the vehicle width direction in the vicinity of a bent portion formed along a stepped portion provided on the other side in the vehicle width direction of the bulging portion. Floor structure. Cross member, according to claim 1, characterized in that said with suitable intervals in the longitudinal direction of the vehicle body of the bulging portion constituted by a plurality of members and facing each were ligated with each member in the forming portion of the bulging portion Vehicle body floor structure as described in 1. A tunnel member is provided on the side of the tunnel portion formed in the longitudinal direction of the vehicle body of the floor panel, and the tunnel member is formed with a bent portion along the bulging shape of the bulging portion, and coupled to the cross member. The vehicle body floor structure according to claim 1 or 2 , characterized in that a fragile portion for reducing rigidity in the vehicle width direction is formed in the vicinity of the bent portion and in the vicinity of the connecting portion to the cross member. In the vehicle width direction inner side portion of the fuel tank facing the stepped portion of the other side in the vehicle width direction of the bulge portion, claims, characterized in that the formation of the recessed portion for arranging the exhaust pipe The vehicle body floor structure according to any one of 1 to 3 .

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