JP4251568B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention relates to a vehicle body lower structure for a vehicle in which side frames are extended in the longitudinal direction of the vehicle body and side sills are arranged on both sides of the side frame.

As a lower body structure of a vehicle, a structure in which a side frame is extended in the longitudinal direction of the vehicle body and a side sill is provided on the outer side of the vehicle width of the side frame is practically used.
In a practical vehicle lower body structure, it was practically sufficient to extend a side frame in the longitudinal direction of the vehicle body, attach an outrigger to the outside of the side frame, and attach a side sill to the tip of the outrigger.

As such a lower body structure of a vehicle, a structure in which a fuel tank is arranged so as to be sandwiched between side frames is known (for example, see Patent Document 1).
Japanese Patent Laying-Open No. 2004-25980 (page 12, FIG. 1)

  FIG. 10 is a diagram for explaining a conventional basic configuration. A vehicle body lower structure 230 includes a pair of left and right side frames 231 and 231 extending in front and rear and parallel to the vehicle body. The members 232 and 233 are passed, and a fuel tank 234 and a silencer 235 are arranged in a space surrounded by the side frames 231 and 231 and the front and rear cross members 232 and 233.

  However, in the vehicle body lower structure 230, the fuel tank 234 and the silencer 235 are arranged in a space surrounded by the side frames 231 and 231 arranged in parallel and the front and rear cross members 232 and 233. Unless separately disposed, the fuel tank 234 cannot be expanded in the vehicle width direction. In order to increase the volume of the fuel tank 234, for example, it may be possible to extend it in the height direction. However, if the fuel tank 234 is extended in the height direction, it is difficult to lower the floor panel. There was a problem of becoming.

  Also, since the side frames 231 and 231 are arranged to the full width of the vehicle, for example, when rigidity near the footrest at the bottom of the dashboard that partitions the engine room and the vehicle compartment is required, the weight of the vehicle body may increase. there were.

  That is, there is a demand for a lower body structure of a vehicle that can reduce the floor panel while ensuring the volume of the fuel tank and can reduce the weight of the vehicle body while ensuring the rigidity of the dashboard.

  The present invention solves the difficulty of securing the volume of the fuel tank and lowering the floor panel, and lowering the floor panel while securing the volume of the fuel tank. An object of the present invention is to provide a vehicle body lower part structure capable of reducing the weight of the vehicle body while improving the rigidity of the dashboard when rigidity near the footrest at the lower part of the dashboard is required. To do.

According to the first aspect of the present invention, a pair of left and right side frames are extended in the longitudinal direction of the vehicle body, and left and right side sills are respectively attached to the outside of the vehicle width of these side frames via outriggers. In a vehicle body lower structure in which a dashboard for partitioning the engine room and the vehicle compartment is attached to a pair of side frames, the pair of left and right side frames are widened in plan view from the vicinity of the footrest at the bottom of the dashboard toward the rear of the vehicle body. It is formed in a substantially C shape, and a plurality of cross members are provided on the front and rear sides of the substantially C-shaped inclined portion, and is formed in a substantially C shape so as to connect the left and right side frames in the widened portion at the rear of the vehicle body. Side frame connecting part behind an outrigger that connects one cross member and left and right side sills connected to the cross member Is provided between the rear side frames, the fuel tank is provided for storing fuel, the cross member has a bottom portion, with substantially U-shaped cross section shaped member having a sidewall portion launched on both sides from the bottom There is a reinforcing bead that is formed in an arch shape in which the depth of the U-shaped cross section at the center is shallower than the depth of the U-shaped cross section at both ends, and the depth of the U-shaped cross section at the bottom is shallow. Is formed.

  For example, if it is possible to reduce the floor panel while securing the volume of the fuel tank, it is preferable because a predetermined fuel storage amount can be maintained and the convenience of getting on and off the vehicle can be improved. Further, when rigidity in the vicinity of the footrest at the lower part of the dashboard is required, for example, if rigidity can be ensured without using a reinforcing member or the like, it is advantageous because the vehicle body can be reduced in weight.

Therefore, the pair of left and right side frames are formed in a substantially C shape wide in plan view from the vicinity of the footrest at the bottom of the dashboard to the rear of the vehicle body, and a cross member is provided in the inclined portion of the approximately C shape. The side frame connecting member is formed in a substantially C-shaped widened portion at the rear of the vehicle body , and behind the outrigger that connects one cross member that connects the left and right side frames and the left and right side sills connected to the cross member. By providing a fuel tank for storing fuel between the side frames provided behind the floor frame, it is possible to reduce the floor panel while securing the volume of the fuel tank.

Further, a pair of left and right side frames, in Rukoto formed substantially c-shaped broadening in plan view toward the rear of the vehicle body from the footrest vicinity of the lower dashboard, through the side frame to footrest near the dashboard lower For example, rigidity can be secured without using a reinforcing member or the like.

  In the invention according to claim 2, the pair of left and right side frames are formed in a substantially C shape wide in plan view from the dashboard toward the front of the vehicle body, and the power is placed in the front widened portion of the substantially C shape. The source is arranged.

  A pair of left and right side frames are formed in a generally C shape widening in plan view from the dashboard toward the front of the vehicle body, and a power source is disposed in the front widened portion of the approximately C shape to The source can be provided in the vehicle width direction. As a result, the front and rear lengths (total length) of the vehicle can be shortened, and for example, the front side frames can be continuously connected before and after the dashboard, and the side frames can be arranged to the vicinity of the footrest. There is an advantage that improvement can be achieved.

In the invention according to claim 1, the pair of left and right side frames are formed in a substantially C shape that is wide in plan view from the vicinity of the footrest at the lower part of the dashboard toward the rear of the vehicle body, and this substantially C-shaped inclined shape. A cross member is provided in the part, and is formed in a substantially C-shaped wide portion at the rear of the vehicle body , and one cross member that connects the left and right side frames and the rear of the outrigger that connects the left and right side sills connected to the cross member Since the side frame connecting member is provided and the fuel tank for storing fuel is provided between the rear side frames, the floor panel can be lowered while securing the volume of the fuel tank. As a result, there are advantages that a predetermined fuel storage amount can be maintained and convenience of getting on and off the vehicle can be improved.

Further, a pair of left and right side frames, than formed in the dashboard lower part of the substantially C-shaped broadening in plan view toward the rear of the vehicle body from the footrest vicinity, through the side frame to footrest near the dashboard lower For example, rigidity can be secured without using a reinforcing member or the like. As a result, there is an advantage that the weight of the vehicle body can be reduced.

  In the invention according to claim 2, the pair of left and right side frames are formed in a substantially C shape wide in plan view from the dashboard toward the front of the vehicle body, and the power is placed in the front widened portion of the substantially C shape. Since the power source is arranged, the power source can be provided in the vehicle width direction. As a result, the front and rear lengths (total length) of the vehicle can be shortened, and for example, the front side frames can be continuously connected before and after the dashboard, and the side frames can be arranged to the vicinity of the footrest. There is an advantage that improvement can be achieved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a vehicle adopting a lower body structure according to the present invention. 10 is a vehicle, 12 is a body frame, 13 is a passenger compartment, 14 is a front bumper, 15 is a front fender, 16 is a front wheel, and 17 is a front wheel. A rear wheel, 18 is a front door, 19 is a rear door, 21 is a tailgate, 22 is a rear bumper, 23 is a hood, and 24 is a roof.
In the vehicle body lower part structure according to the present invention, a pair of left and right side frames 42L and 42R are formed in a substantially C shape wide in plan view toward the rear of the vehicle body. A fuel tank 35 for storing fuel is provided.

  FIG. 2 is a perspective view of the vehicle lower body structure according to the present invention. The vehicle lower body structure 40 includes a vehicle body frame 12, a floor panel 31 attached to the vehicle body frame 12, and a front portion of the floor panel 31. And a fuel tank 35 disposed in the lower part of the floor panel 31.

The floor panel 31 is a member that is mounted substantially flat on the vehicle body frame 12.
The dashboard (dash panel) 32 is a member formed continuously on the floor panel 31 together with a partition wall that partitions the engine room 33 and the vehicle compartment 13 (see FIG. 1). In the figure, 34 is a front subframe that supports a power plant (not shown), and 38 is the vicinity of the footrest.

  The vehicle body frame 12 includes left and right front side frames 41 and 41, left and right side frames (floor frames) 42L and 42R extending to the rear of the vehicle body on the front side frames 41 and 41, and side frames 42L and 42R, respectively. Left and right rear frames (rear side frames) 43, 43 extending from the rear of the vehicle body, a first cross member 44 connecting the front portions of the left and right side frames 42L, 42R, and a middle connecting the left and right side frames 42L, 42R. Two cross members 45, a third cross member 46 connecting the rear portions of the left and right side frames 42L and 42R, and left and right first frames extending outward from the connection positions of the first cross members 44 of the left and right side frames 42L and 42R. 1 Outriggers (overhang members) 47, 47 and left and right side frames Left and right second outriggers (extension members) 48 and 48 extending outward from the connection position of the second cross member 45 of 42L and 42R, and the third cross member 46 connection position of the left and right side frames 42L and 42R, respectively. Left and right third outriggers (extension members) 49, 49, left front side sills 52L connected to the tips of the left first to third outriggers 47 to 49, and right first to third outriggers, respectively. The right front side sill 52R connected to the tips of 47 to 49, a lateral coupling member (side frame coupling member) 53 that connects the left and right side frames 42L, 42R behind the third cross member 46, and the left and right rear frames 43 , 43, a rear cross member 54, a left side sill extension 58L extending from the rear end of the left front side sill 52L, A side sill extending portion 58R of the right extended from the rear end of the front side sill 52R, consists.

  The side frames 42L and 42R are formed in a substantially C shape that is widened in plan view toward the rear of the vehicle body, and includes a widened portion 62 that is formed in the substantially C shape, and in plan view toward the front of the vehicle body. And a front widened portion 63 formed in an approximately C shape having a wide width. Note that 39L and 39R indicate the bottom surfaces of the side frames 42L and 42R, respectively.

3 is a cross-sectional view taken along line 3-3 of FIG. 2 and shows a vertical cross section of the right side of the vehicle body. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG.
In FIG. 3, the depths of the first to third cross members 44 to 46 at the right side of the vehicle body having a substantially U-shaped cross section are substantially the same as the depth of the side frame 42R. 4 shows that the depth of the first to third cross members 44 to 46 at the vehicle body center portion having a substantially U-shaped cross section is formed to be shallower than the depth of the side frame 42R.

  FIG. 3 shows that the depth of the lateral connecting member 53 at the right side of the vehicle body having a substantially U-shaped cross section is formed shallower than the depth of the side frame 42R. Further, in FIG. 4, the depth of the lateral connecting member 53 at the vehicle body center portion having a substantially U-shaped cross section is substantially the same as the depth at the vehicle body right side portion shown in FIG. 8.

  FIG. 5 is a perspective view of a vehicle body frame employed in the vehicle body lower part structure of the vehicle according to the present invention. The first cross member 44 is a substantially U-shaped cross-sectional member having an upper opening, and includes a bottom 71, The bottom portion 71 is a member composed of side walls 72a and 72b raised from both sides of the bottom portion 71. The bottom portion 71 has a U-shaped cross-section depth of the center portion 71a larger than the U-shaped cross-section depths of both end portions 71b and 71b. It also has a shallow arch shape. The second cross member 45 will be described in detail with reference to FIG.

  The third cross member 46 is a member having a substantially U-shaped cross-section with an upper opening, and includes a bottom portion 73 and side wall portions 74 and 74 raised from both sides of the bottom portion 73. The bottom 73 has an arch shape in which the depth of the U-shaped cross section of the central portion 73a is shallower than the depth of the U-shaped cross sections of both end portions 73b, 73b, and the bottom 73 is along the side walls 74, 74. The reinforcing beads 75 shown in FIG. 3 are formed (... indicates a plurality, the same applies hereinafter).

  The lateral connection member 53 is a member having an approximately U-shaped cross section with an upper opening, and a member including a bottom portion 77 (see FIG. 3) and side wall portions 78 and 78 raised from the bottom portion 77 on both sides. It is.

FIG. 6 is a perspective view of a cross member employed in the vehicle lower body structure according to the present invention, and shows a second cross member 45.
The second cross member 45 is a member having an approximately U-shaped cross-section with an upper opening, and includes a bottom portion 81, side wall portions 82 and 82 raised from the bottom portion 81, and the side wall portions 82 and 82. Front and rear flanges 83, 83 formed outward, side flanges 84... Bent at the left and right ends of the side walls 82, 82, and a plurality of reinforcements formed on the bottom 81 along the side walls 82, 82. And bead 85... And left and right attachment portions 86 and 86 attached to the side frames 42L and 42R (see FIG. 3) by extending from the left and right of the bottom portion 81, respectively.

  The bottom portion 81 has an arch shape in which the depth of the U-shaped cross section of the center portion 81a is shallower than the depth of the U-shaped cross sections of both end portions 81b and 81b.

FIG. 7 is a plan view of a vehicle body frame employed in the vehicle body lower part structure according to the present invention, and FIG. 8 is a longitudinal sectional view of the vehicle body frame employed in the vehicle body lower structure according to the present invention.
The lower body structure 40 of the vehicle extends a pair of left and right side frames 42L and 42R in the longitudinal direction of the vehicle body, and the left and right sides of the side frames 42L and 42R are placed on the left and right sides via outriggers 47 to 49 and 47 to 49, respectively. The vehicle body of the vehicle is provided with side sills 51L and 51R, and a dashboard 32 (see FIG. 2) for partitioning the engine room 33 and the vehicle compartment 13 in the vicinity of the front ends of the side sills 51L and 51R and between the pair of left and right side frames 42L and 42R. In the lower structure, a pair of left and right side frames 42L and 42R are formed in a substantially C shape wide in plan view from the dashboard 32 toward the rear of the vehicle body, and in the widened portion 62 formed in this substantially C shape. It can be said that a fuel tank 35 for storing fuel is provided.

  For example, if it is possible to reduce the floor panel while securing the volume of the fuel tank, it is preferable because a predetermined fuel storage amount can be maintained and the convenience of getting on and off the vehicle can be improved. Further, when rigidity in the vicinity of the footrest at the lower part of the dashboard is required, for example, if rigidity can be ensured without using a reinforcing member or the like, it is advantageous because the vehicle body can be reduced in weight.

  Therefore, the pair of left and right side frames 42L and 42R are formed in a substantially C shape wide in plan view from the dashboard 32 toward the rear of the vehicle body, and the fuel is placed in the widened portion 62 formed in the substantially C shape. By providing the fuel tank 35 for storing the fuel, the floor panel can be lowered while securing the volume of the fuel tank. As a result, the predetermined fuel storage amount can be maintained and the convenience of getting on and off the vehicle 10 (see FIG. 1) can be improved.

  Further, by forming the pair of left and right side frames 42L and 42R in a substantially C shape wide in plan view from the dashboard 32 toward the rear of the vehicle body, for example, the side frames 42L, 42R The frames 42L and 42R can be passed, and for example, rigidity can be secured without using a reinforcing member. As a result, the weight of the vehicle 10 (see FIG. 1) can be reduced.

  In the lower body structure 40 of the vehicle, a pair of left and right side frames 42L and 42R are formed in a substantially C shape wide in plan view from the dashboard 32 toward the front of the vehicle body. The power source 28 is disposed in the widened portion 63. Therefore, the power source 28 can be provided in the vehicle width direction. As a result, the front and rear lengths (full length) of the vehicle can be shortened, and, for example, the front side frames 41 and 41 are continuously connected before and after the dashboard 32, and the side frames up to the footrest vicinity 38 (see FIG. 2). 42L and 42R can be arranged, and the collision performance can be improved. The power source 28 refers to an engine, an electric motor, a power plant, or the like.

The operation of the vehicle body lower structure 40 described above will be described.
FIGS. 9A and 9B are comparative explanatory views of the vehicle body lower structure of the vehicle according to the present invention, FIG. 9A shows the vehicle body lower structure 120 of the comparative example, and FIG. 9B shows the vehicle of the example. The vehicle body lower structure 40 is shown.

  In (a), the vehicle body lower structure 120 includes a vehicle body frame 121, left and right side frames 122L, 122R, first to third cross members 124-126 that connect these side frames 122L, 122R, and side frames. Left and right first to third outriggers 127 to 129 and 127 to 129 that extend outward from the vehicle width from 122L and 122R, and a left side sill 131L that extends to the tip of the left first to third outriggers 127 to 129; The right side sill 131R passed to the tips of the right first to third outriggers 127 to 129, and sandwiched between the left and right side frames 122L and 122R, and the space behind the third cross member 126 is placed in a canister or a pre-chamber An arrangement space S1 of a fuel tank (not shown) including is set.

  In the lower body structure 120 of the vehicle, the arrangement space S1 of the fuel tank (not shown) is fixed to the predetermined width B1, so that for example, when the arrangement space (space) S1 of the fuel tank 135 needs to be enlarged, It will spread in the direction. If the arrangement space S1 of the fuel tank 135 is expanded in the height direction, the floor of the vehicle cannot be reduced.

  In (b), S2 is the arrangement space (space) of the fuel tank 35 (see FIG. 7), B2 is a predetermined width of the arrangement space S2, and the predetermined width B2 is wider than the predetermined width B1 shown in (a). That is, in the vehicle body lower structure 40 of the vehicle, the pair of left and right side frames 42L and 42R are formed in a substantially C shape wide in plan view from the dashboard 32 toward the rear of the vehicle body. By providing the fuel tank 35 (see FIG. 7) for storing fuel in the formed widened portion 62, the floor panel 31 (see FIG. 2) can be lowered while securing the volume of the fuel tank 35. . As a result, the predetermined fuel storage amount can be maintained and the convenience of getting on and off the vehicle can be improved.

  In the vehicle lower body structure according to the present invention, as shown in FIG. 3, the side frames 42L and 42R are formed in a substantially C shape wide in plan view from the dashboard 32 toward the rear of the vehicle body. However, the present invention is not limited to this, and any frame that extends from the dashboard 32 toward the rear of the vehicle body may be used.

  The vehicle body lower part structure according to the present invention is suitable for use in vehicles such as minivans and wagons.

1 is a perspective view of a vehicle that employs a lower body structure according to the present invention. It is a perspective view of the vehicle body lower part structure of the vehicle concerning the present invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 is a perspective view of a vehicle body frame employed in a vehicle lower body structure according to the present invention. It is a perspective view of the cross member employ | adopted as the vehicle body lower part structure of the vehicle which concerns on this invention. It is a top view of the vehicle body frame employ | adopted as the vehicle body lower part structure of the vehicle which concerns on this invention. It is a longitudinal cross-sectional view of the vehicle body frame employ | adopted as the vehicle body lower part structure of the vehicle which concerns on this invention. It is comparison explanatory drawing of the vehicle body lower part structure of the vehicle which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 12 ... Body frame, 13 ... Vehicle compartment, 32 ... Dashboard, 33 ... Engine room, 35 ... Fuel tank, 40 ... Lower body structure of vehicle, 42L, 42R ... Left and right side frames, 47-49 ... Outriggers (first to third outriggers), 51L, 51R ... left and right side sills, 63 ... front widened portion.

Claims (2)

A pair of left and right side frames are extended in the longitudinal direction of the vehicle body, and left and right side sills are attached to the outside of the vehicle width of these side frames via outriggers, respectively, and the engine room is attached to the pair of left and right side frames near the front ends of these side sills. In the vehicle lower body structure with a dashboard that partitions the cabin,
The pair of left and right side frames are formed in a substantially C shape widening in plan view from the vicinity of the footrest at the bottom of the dashboard toward the rear of the vehicle body, and a plurality of front and rear sides are inclined in a substantially C-shaped inclined portion. A cross member is provided, is formed in a substantially C-shape and is located in the widened part at the rear of the vehicle body , and behind the outrigger that connects the one cross member connecting the left and right side frames and the left and right side sills connected to the cross member. A side frame connecting member is provided, and a fuel tank for storing fuel is provided between the side frames behind the side frame connecting member ,
The cross member is a member having a substantially U-shaped cross section having a bottom portion and side wall portions raised from both sides of the bottom portion. The depth of the U-shaped cross section at the center is greater than the depth of the U-shaped cross section at both ends. A vehicle body lower part structure for a vehicle, wherein a reinforcing bead is formed along the side wall at a portion where the U-shaped cross section of the bottom portion is shallow.   The pair of left and right side frames are formed in a substantially C shape wide in plan view from the dashboard toward the front of the vehicle body, and a power source is disposed in the front widened portion of the substantially C shape. The vehicle body lower part structure according to claim 1.

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