JP2017035918A - Vehicular body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular body structure in which a battery box can be protected from an external force upon a vehicular side surface collision and a vehicular body rigidity can be improved.SOLUTION: A beam member 12 is fixed and installed under a condition of being hung over between tire houses 20R, 20L which are components of side structures 18R, 18L. Fixing members 12a-R, 12a-L at the left and right both end parts of the beam member are positioned at vehicular width direction outsides more than a battery box 14, and an external force upon a vehicular side surface collision is input to the beam member prior to the battery box. As the beam member absorbs impact upon a vehicular side surface collision, impact to the battery box can be suppressed. A structure part is formed by the beam member, the part of the tire house from the position at which the beam member is fixed to a floor panel 16 and the floor panel. Thus, a reinforcement structure in the shear plane direction of the vehicular body 10 is constructed, and the vehicular body can be improved against the external force upon a vehicular side surface collision.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle body structure, and more particularly to a vehicle body structure in which a battery box is mounted between side structures provided on the left and right sides of a floor panel of a vehicle body.

  In recent years, lithium-ion batteries have become the mainstream of batteries mounted on vehicles. Lithium-ion batteries are larger in volume and weight than conventional nickel-metal hydride batteries, and the battery boxes that house them are also larger. Further, unlike a nickel metal hydride battery, when a lithium ion battery is used, if a large external force is applied to the battery box at the time of a vehicle collision and the internal lithium ion battery is destroyed, flammable gas may be generated.

  Therefore, regarding the vehicle body structure for mounting a lithium ion battery, impact resistance must be considered more than when using a conventional nickel metal hydride battery, and the battery becomes larger and external force at the time of collision is applied to the battery box. It is more demanded to protect the battery box from an external force at the time of a collision because it is easily transmitted.

  For example, Patent Document 1 discloses a structure of a rear part of a vehicle body for protecting a lithium ion battery from an external force at the time of a collision. According to this technique, one horizontal member for a battery box for placing the battery box is installed in the vehicle width direction between the left and right rear frames extending in the longitudinal direction of the vehicle body.

  Two box vertical members for supporting the battery box in the front-rear direction are installed between the horizontal member for the battery box and a cross member installed to extend in the vehicle width direction in front of the horizontal member. Has been. A battery box is installed in a box frame having these horizontal members for battery boxes and two vertical members for boxes. Furthermore, a protective frame for dispersing an impact force at the time of a rear collision is erected on the upper surface of the rear frame portion located behind the battery box, and a member that reinforces the tire house located forward from the upper end portion of the protective frame The tire house reinforcing gusset is provided with an upper load transmission member.

  The upper load transmission member distributes the impact load received by the protective frame at the time of a rear collision to the lower rear frame where the protective frame is erected and the upper load transmission member provided at the upper end. The load input to the box is suppressed.

Japanese Patent No. 55597681

  In the technique according to Patent Document 1, the load at the time of “rear surface” collision is suppressed from being transmitted to the battery box as described above, but no special consideration is given to the case of a side collision. At the time of the “side” collision, a large external force may reach the battery box. In addition, no special consideration has been given to the influence on the vehicle body rigidity due to the installation of a large and heavy battery. For this reason, since the vehicle body rigidity is not sufficient, the side structure of the vehicle body may fall in the vehicle width direction at the time of a side collision.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle body structure capable of protecting the battery box from an external force at the time of a side collision of the vehicle and improving the vehicle body rigidity. .

  The vehicle body structure according to claim 1 for solving the above object is a vehicle body structure in which a battery box is mounted between side structures provided on the left and right sides of a floor panel of the vehicle body. It has a bridging member that is bridged between the side structures in the vehicle width direction and is fixedly installed, and the bridging member and the left and right positions where the bridging member of the side structure is fixed to the floor panel. A reinforcing structure in the shear plane direction is constituted by the lower portion and the floor panel.

  According to this configuration, since the left and right ends of the bridging member fixed to the side structure are located on the outer side in the vehicle width direction than the battery box, the external force at the time of the side collision at the time of the vehicle side collision Is input to the bridging member prior to the battery box. Thereby, the bridging member absorbs the impact caused by the external force and alleviates the impact on the battery box, so that the battery box can be protected from the external force at the time of a side collision of the vehicle.

  Further, the structure surrounded by the bridging member, the lower part of the side structure, and the floor panel forms a reinforcing structure in the direction of the shear plane of the vehicle body. Stiffness can be improved. As a result, the side structure can be prevented from falling in the vehicle width direction due to an external force at the time of a side collision of the vehicle, and the vehicle body rigidity is improved and the vibration of the vehicle body is suppressed by the reinforcing structure in the shear surface direction. Therefore, it is possible to suppress the occurrence of low frequency vibrations on the floor panel, the seat, and the like.

  A vehicle body structure according to a second aspect is the vehicle body structure according to the first aspect, wherein the reinforcing structure in the direction of the shear plane is configured such that the bridging member extends along the upper edge of the front wall portion of the battery box on the vehicle front side. The battery box is configured to be extended and fixed to at least a part of the upper end edge of the front wall portion of the battery box.

  According to this configuration, since the bridging member is fixed at least at a part of the upper end edge of the front wall portion of the battery box on the vehicle front side, substantially the entire front wall portion of the battery box has a surface rigidity. It can be used as a structure. Thereby, the front wall part of a battery box can be used effectively, and the rigidity of the shear plane direction of a vehicle body can be improved.

  A vehicle body structure according to a third aspect is the vehicle body structure according to the first aspect, wherein the reinforcing structure in the shear plane direction is bridged between the left and right side structures having the bridge member as a part of a component. It is characterized by being formed by a frame-like structure.

  According to this configuration, the frame-like structure spanned between the left and right side structures is used as a reinforcing structure having surface rigidity in the shear plane direction of the vehicle body. In addition, by adopting a frame-like structure, the bridge member is reinforced and the rigidity in the shear plane direction is further increased. Furthermore, by making the frame-shaped structure non-fixed to the battery box, it is possible to prevent an impact at the time of a side collision from being transmitted to the battery case via the frame-shaped structure.

  The vehicle body structure according to claim 4 is the vehicle body structure according to any one of claims 1 to 3, wherein the installation of the bridging member to the side structure is a component of the side structure. It is characterized by being carried over between tire houses.

  According to this configuration, since the tire house is a portion that has low rigidity and is easily crushed among the elements constituting the side structure, the impact at the side collision is absorbed by the tire house being crushed at the side collision. Therefore, the transmission of the impact force to the bridging member is suppressed, and the influence due to the impact at the time of the collision with the battery box is suppressed.

  According to the present invention, the battery housed in the battery box can be protected by protecting the battery box from an external force at the time of a side collision of the vehicle, and the rigidity in the shear plane direction of the vehicle body is improved. Thus, the vehicle body rigidity is enhanced.

The vehicle body structure which concerns on embodiment of this invention WHEREIN: The perspective view which shows the state in which the bridging member was bridged between the side structures and was fixedly installed. The partial exploded perspective view for demonstrating the structure of a bridge member. The disassembled perspective view for demonstrating the method of spanning a spanning member between side structures and fixing and installing. The perspective view which shows the ladder-shaped frame-shaped structure spanned between the tire houses on either side. (A) And (B) is a perspective view which shows the modification of a frame-shaped structure, respectively.

  Embodiments of a vehicle body structure according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a state in which a bridging member is bridged between side structures in the vehicle width direction and fixedly installed in the vehicle body structure according to the embodiment of the present invention. Side structures 18 </ b> R and 18 </ b> L are provided substantially perpendicular to the upper surface of the floor panel 16 on both the left and right sides of the floor panel 16 of the vehicle body 10. Between the left and right side structures 18R and 18L on the upper surface of the floor panel 16, a substantially rectangular battery box 14 is mounted in a fixed state.

  The size of the battery box 14 is such that side wall portions of the battery box 14 on the vehicle width direction side approach the side structures 18R and 18L, respectively, and the battery box 14 has a large capacity and about 140 kg. A lithium-ion battery having a weight of 2 is housed.

  The substantially rod-shaped bridging member 12 is installed so as to extend along the upper end edge 14 u which is the upper side of the substantially rectangular front wall portion 14 f on the vehicle front side of the battery box 14, and the length of the bridging member 12 is long. Both end portions in the vertical direction are bridged and fixed between the left and right tire houses 20R, 20L which are constituent elements of the side structures 18R, 18L. The bridging member 12 is fixed at the upper end edge 14 u of the front wall portion 14 f of the battery box 14 via a bracket 12 b provided on the bridging member 12.

  FIG. 2 shows a specific structure of the bridging member 12, and FIG. 3 shows a method in which the bridging member 12 is bridged between the side structures 18R and 18L and fixed. 2 and 3, the same elements as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 2, the bridging member 12 is attached to the bridging member main body 12c formed of a metal square pipe, and to protrude outward in the width direction at the center in the length direction of the bridging member main body 12c. Plate-like bracket 12b and fixing members 12a-R and 12a-L respectively attached to both ends in the length direction of the bridging member main body 12c.

  The bracket 12b is fixed to the bridge member main body 12c by two screws 100b-1 and 100b-2, and the fixing members 12a-R and 12a-L are attached to the bridge member main body 12c. As shown in the drawing, both ends in the length direction of the bridging member main body 12c are inserted into the respective internal spaces formed in the fixing members 12a-R and 12a-L, respectively.

  Further, the bracket 12b is formed with a through hole 12h for passing a bolt, and the fixing members 12a-R and 12a-L are respectively formed with two through holes for passing the bolt as shown in the figure. Has been.

  In FIG. 3, mounting portions 20a-R and 20a-L are formed to project from the inner surfaces of the left and right tire houses 20R and 20L, which are components of the side structures 18R and 18L, respectively. Two holes are formed (only one through hole formed in 20a-R is shown).

  The method of installing the bridging member 12 between the left and right tire houses 20R, 20L and fixing the mounting members 20a-R, 20a-L formed on the left and right tire houses 20R, 20L in the vehicle longitudinal direction, respectively. This is done by passing bolts through the two through holes in a state sandwiched between the fixing members 12a-R and 12a-L from both sides.

  Further, the method of fixing the bridging member 12 to the battery box 14 is that the bracket 12b is attached to the battery box so that the through hole 12h formed in the bracket 12b and the small hole 14h formed in the upper surface of the battery box 14 are aligned. This is done by placing the bolt on the upper surface and passing the bolt through the through hole 12h.

  In FIG. 1, the left and right fixing members 12 a -R and 12 a -L located at both ends in the longitudinal direction of the bridging member 12 spanned in the vehicle width direction between the tire houses 20 R and 20 L are more than the battery box 14. Since the vehicle is located on the outer side in the vehicle width direction, the external force at the time of a side collision of the vehicle is input to the bridge member 12 before the battery box 14. Thereby, it is possible to suppress the impact on the battery box 14 by the bridging member 12 absorbing the impact at the time of the side collision.

  In addition, the tire houses 20R and 20L over which the bridging member 12 is bridged are portions that are easily broken and crushed among the components of the side structures 18R and 18L. For this reason, at the time of a side collision of the vehicle, the tire houses 20R and 20L are crushed, so that the tire houses 20R and 20L can absorb the impact, and the impact on the bridge member 12 can be reduced. Thereby, the influence of the impact on the battery box 14 transmitted through the bridging member 12 can be reduced.

  There are no important equipment such as fuel gauges or filler pipes in the vicinity of the tire houses 20R and 20L. By keeping the bridge position of the bridge member 12 away from these important equipments, the risk of damaging these equipments in a side collision can be reduced. Accordingly, the tire houses 20R and 20L are optimal as places where the bridging member 12 is bridged.

  The bridging member 12 is indirectly fixed to the battery box 14 via the bracket 12b. Thereby, it can suppress that the external force input into the bridging member 12 at the time of a side collision of a vehicle is transmitted to the battery box 14 via the bridging member 12. Further, when a large external force is input to the bridging member 12, the bracket 12 b is formed to have such a strength that the bracket is broken and separated from the battery box 14. It is possible to suppress transmission.

  Further, in FIG. 1, the bridging member 12 is fixedly installed in a state of being spanned between the tire houses 20R and 20L which are components of the side structures 18R and 18L, so that the bridging member 12 and the side structures 18R and 18L A vehicle-shaped front-view square shape surrounded by the floor panel 16 and the lower part from the left and right positions where the bridging member 12 of the tire house 20R, 20L, which is a component of 18L, is fixedly installed to the floor panel 16 A structure part is formed.

  Thereby, the reinforcement structure of the shear surface direction of the vehicle body 10 can be comprised, and a vehicle body structure can be improved with respect to the external force at the time of a vehicle side collision. Further, this reinforcing structure can prevent the side structures 18R and 18L from falling in the vehicle width direction due to an external force at the time of a side collision of the vehicle. Furthermore, it is possible to suppress the occurrence of low-frequency vibrations in the floor panel 16 and the seat by improving the vehicle body rigidity.

  Further, as shown in FIG. 1, the bridging member 12 is installed so as to extend along the upper end edge 14u of the substantially rectangular front wall portion 14f on the vehicle front side of the battery box 14, and the upper end edge 14u It is fixed to the battery box 14 at the center. Thereby, substantially the whole of the substantially rectangular front wall portion 14f can be used as the surface rigidity structure in the shear plane direction of the vehicle body 10, and the vehicle body rigidity in the shear plane direction can be improved.

  FIG. 4 shows a ladder-like frame structure 22 spanned between the left and right tire houses 20R, 20L. In FIG. 4, the same elements as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The frame-like structure 22 is formed between the tire house 20R and 20L, the bridge member 12 bridged between the tire houses 20R and 20L, and the tire house 20R and 20L at a position directly below the bridge member 12 and close to the upper surface of the floor panel 16. The second bridging member 22h spanned in the vehicle width direction and the bridging member 12 and the second bridging member 22h are orthogonal to both the bridging member 12h and the second bridging member 22h. It is composed of five vertical members 22v-1, 22v-2, 22v-3, 22v-4, and 22v-5 that are spanned at equal intervals.

  The second bridging member 22h has the same material and structure as the bridging member 12 described above, and is bridged and fixedly installed between the tire houses 20R and 20L by the same method as the bridging member 12. The vertical members 22v-1, 22v-2, 22v-3, 22v-4, and 22v-5 are formed by metal square pipes, and the bridging member 12 and the second bridging member 22h are welded. It is fixed by.

  The second bridging member 22h is fixed to the upper surface of the floor panel 16 by a fixing member (not shown) attached to the second bridging member 22h. Thus, the frame-like structure 22 is fixedly installed so as to be bridged between the left and right tire houses 20R, 20L in a state where the frame-like structure 22 is erected substantially perpendicular to the floor panel 16. The frame-like structure 22 easily improves the rigidity of the reinforcing structure in the shear direction of the vehicle body 10 with a small number of members by forming a ladder-like surface rigid structure spanned between the tire houses 20R and 20L. be able to.

  In addition, since the frame-like structure 22 is not fixed to the battery box 14 and is in a separated state, even if an external force at the time of a side collision of the vehicle is input to the frame-like structure 22, the impact is not generated. Transmission to the battery box 14 via the frame-shaped structure 22 can be suppressed.

  In addition, this invention is not limited to the range shown to the said embodiment, A various deformation | transformation is possible within the range of the summary of invention.

  For example, in the above embodiment, the frame-like structure 22 includes the second bridging member 22h as a constituent element, but the second bridging member 22h may not be used.

  FIG. 5 shows a modification of the frame-shaped structure 22. In FIG. 5, the same elements as those shown in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The frame-like structure 24 shown in FIG. 5A has a structure in which the second bridge member is excluded from the components of the frame-like structure 22. One end of each of the five vertical members 24 v-1, 24 v-2, 24 v-3, 24 v-4, and 24 v-5 is welded and fixed to the bridging member 12, and each other end is fixed to the floor panel 16. It is fixed to the upper surface (not shown). Thereby, the frame-like structure 24 can form a surface rigid structure with fewer members than the frame-like structure 22, and can easily reinforce the rigidity of the vehicle body 10 in the shear direction.

  A frame-like structure 26 shown in FIG. 5B includes eight cross members 26c-1, 26c-2, 26c-3, 26c-4, as constituent elements of the frame-like structure 22 described above. 26c-5, 26c-6, 26c-7, and 26c-8 are added. In the frame-like structure 26, as shown in the drawing, two intersecting members 26c-1, 26c- are provided between the vertical members 26v-1, 26v-2, 26v-3, 26v-4, 26v-5, respectively. 2, 26c-3, 26c-4, 26c-5, 26c-6, 26c-7, and 26c-8 are bridged obliquely and fixed.

  Thereby, the frame-like structure 26 can further improve the strength as the surface rigid structure, and can additionally reinforce the rigidity in the shear direction of the vehicle body 10.

DESCRIPTION OF SYMBOLS 10 Body 12 Crossing member 12b Bracket 12c Crossing member main-body part 12h Through-hole 12a-R, 12a-L Fixing member 14 Battery box 14f Front wall part 14h Small hole 14u Upper end part 16 Floor panel 18R, 18L Side structure 20R, 20L Tire house 20a-R, 20a-L Attachment portion 22, 24, 26 Frame-like structure 22h, 26h Second bridging member 22v-1, 22v-2, 22v-3, 22v-4, 22v-5, 26v -1, 26v-2, 26v-3, 26v-4, 26v-5, vertical member 26c-1, 26c-2, 26c-3, 26c-4, 26c-5, 26c-6, 26c-7, 26c -8 Cross member

Claims (4)

In the vehicle body structure in which the battery box is mounted between the side structures provided on the left and right sides of the floor panel of the vehicle body,
In the upper vicinity of the battery box, a bridging member is installed between the side structures in a vehicle width direction and fixedly installed.
A reinforcing structure in a shear plane direction is constituted by the bridge member, a lower portion from the left and right positions where the bridge member of the side structure is fixed to the floor panel, and the floor panel. Car body structure. The reinforcing structure in the shear plane direction is
The bridging member is installed so as to extend along the upper end edge of the front wall portion of the battery box on the vehicle front side, and is fixed to at least a part of the upper end edge of the front wall portion of the battery box. The vehicle body structure according to claim 1, wherein the vehicle body structure is configured. The reinforcing structure in the shear plane direction is
The vehicle body structure according to claim 1, wherein the vehicle body structure is formed by a frame-like structure that is bridged between the left and right side structures, the bridge member being a component. The fixed installation of the bridge member to the side structure is as follows:
The vehicle body structure according to any one of claims 1 to 3, wherein the vehicle body structure is bridged between left and right tire houses that are components of the side structure.

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