Vehicle body structure

Abstract

To suppress displacement to the inside in a vehicle width direction at side collision of a vehicle.SOLUTION: A vehicle body structure 10 comprises: a floor tunnel 14 bulging from a floor panel 12 to an upper side of a vehicle and extending in a longitudinal direction of the vehicle; a pair of side members 20 provided at both sides in a vehicle width direction of the floor panel 12 and extended in the longitudinal direction of the vehicle; second cross members 32 extending in the vehicle width direction to connect the floor tunnel 14 to the side members 20; a first underfloor brace 50 provided at a lower side of the vehicle of the floor tunnel 14, and arranged at a rear side of the vehicle with resect to the second cross members 32; and diagonal braces 40 connecting the first underfloor brace 50 to the second cross members 32.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle body structure.

Background Art

[0002] Patent Document 1 discloses a vehicle rear structure in which the rear end of an under R / F is fixedly supported via a brace on a generally highly rigid rear side member. Thereby, when the under R / F tends to be displaced inward in the vehicle width direction by a side collision load during a pole side impact, the movement of the rear end portion of the under R / F is suppressed by the brace and the highly rigid rear side member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a vehicle body structure, it is preferable to suppress the displacement inward in the vehicle width direction during a vehicle side collision.

[0005] An object of the present invention is to obtain a vehicle body structure capable of suppressing the displacement inward in the vehicle width direction during a vehicle side collision.

Means for Solving the Problems

[0006] First aspectThe vehicle body structure comprises a floor tunnel that rises above the floor panel and extends in the longitudinal direction of the vehicle, a pair of side members provided on both sides of the floor panel in the vehicle width direction and extending in the longitudinal direction of the vehicle, a cross member extending in the vehicle width direction and connecting the floor tunnel and the side members, and an underbody brace provided below the floor tunnel, wherein the underbody brace provided at the front or rear of the vehicle relative to the cross member, and a diagonal brace connecting the underbody brace and the cross member. The bracing brace has a bead formed on it. .

[0007] First aspect In the vehicle body structure, a diagonal brace is provided to connect the underbody brace and the cross member. This allows the load transmitted from the cross member to be distributed from the diagonal brace to the underbody brace during a side collision of the vehicle (especially a pole impact). As a result, the concentration of load on the floor tunnel is avoided, and the deformation of the floor tunnel is suppressed. Consequently, inward displacement in the vehicle width direction during a side collision can be suppressed. Furthermore, in the vehicle body structure according to this embodiment, the bracing braces have beads formed on them, which improves the rigidity of the bracing braces compared to cases where no beads are formed on the bracing braces. As a result, deformation of the floor tunnel is further suppressed.

[0008] Second aspect The vehicle body structure related to this is Regarding the first aspect In the vehicle body structure, the diagonal brace is provided between a center cross member that spans the side members and extends in the vehicle width direction, and the side members provided in front of the center cross member.

[0009] Second aspect In the vehicle body structure described above, the diagonal brace is positioned between the center cross member, which spans the side members and extends in the vehicle width direction, and the side member located in front of the center cross member. This arrangement allows the load transmitted from the cross member to be distributed from the diagonal brace to the underbody brace during a side collision (especially a pole impact). As a result, the concentration of load on the floor tunnel is avoided, and deformation of the floor tunnel is suppressed. Consequently, the relative displacement between the cross member and the center cross member is suppressed, preventing cracks from forming in the floor panel.

[0010] Third aspect The vehicle body structure related to this is First aspect or Second aspect to related In the vehicle body structure, the diagonal brace is provided on the inside of the vehicle from the center of the cross member in the vehicle width direction.

[0011] Third aspect In the vehicle body structure described herein, the diagonal braces are positioned on the inside of the vehicle from the center of the cross member in the vehicle width direction. This allows for a smaller size of the diagonal braces compared to a case where one end of the diagonal brace is positioned on the outside of the vehicle from the center of the cross member in the vehicle width direction. As a result, a vehicle body structure with reduced weight can be achieved.

[0014] Fourth aspect The vehicle body structure related to this is First aspect from Third aspect any one Regarding the manner In the vehicle body structure, a second underbody brace is provided below the floor tunnel of the vehicle, connecting one of the cross members to the other cross member.

[0015] Fourth aspect In the vehicle body structure described above, a second underbody brace is provided beneath the floor tunnel, connecting one cross member to the other. This allows the load transmitted from the cross members to be distributed to the second underbody brace during a side collision (especially a pole collision). As a result, the concentration of load on the floor tunnel is avoided, and deformation of the floor tunnel is suppressed. Consequently, inward displacement in the vehicle width direction during a side collision can be suppressed. [Effects of the Invention]

[0016] As described above, the vehicle body structure according to the present invention can suppress inward displacement in the vehicle width direction during a side collision. [Brief explanation of the drawing]

[0017] [Figure 1]It is a plan view schematically showing a vehicle body structure according to the first embodiment. [Figure 2] It is a schematic view showing an enlarged view of the vehicle body structure according to the first embodiment at the time of pole side collision. [Figure 3] It is a schematic view showing an enlarged view of the vehicle body structure according to the comparative example at the time of pole side collision. [Figure 4] It is a plan view schematically showing a vehicle body structure according to the second embodiment.

Mode for Carrying Out the Invention

[0018] 〔First Embodiment〕 Hereinafter, the vehicle body structure according to the first embodiment will be described with reference to the drawings. In the first embodiment, an example of the vehicle body structure of a passenger car will be described. Note that the arrow FR shown in FIG. 1 indicates the front side in the vehicle longitudinal direction, and the arrow RH indicates the right side in the vehicle width direction.

[0019] [Configuration of Vehicle Body Structure 10] As shown in FIG. 1, the vehicle body structure 10 includes a floor panel 12, side members 20, cross members 30, diagonal braces 40, and a first underfloor brace 50 as an underfloor brace.

[0020] (Floor Panel 12) The floor panel 12 is provided at the lower part of the vehicle and constitutes the floor of the passenger compartment. The floor panel 12 is formed of a substantially rectangular plate material with the plate thickness direction in the vehicle vertical direction.

[0021] In the central portion of the floor panel 12 in the vehicle width direction, a floor tunnel 14 formed by raising the floor panel 12 upward of the vehicle is provided. The floor tunnel 14 is formed in a substantially U-shaped cross section opened to the lower side of the vehicle. The floor tunnel 14 extends in the vehicle longitudinal direction. The floor tunnel 14 includes a left side surface 14B on the left side of the vehicle, a right side surface 14C on the right side of the vehicle, and an upper surface 14A connecting the upper end portions of the left side surface 14B and the right side surface 14C.

[0022] The front end of the floor tunnel 14 is joined to the dash panel (not shown). The rear end of the floor tunnel 14 is joined to the center cross member 33 which extends in the vehicle width direction.

[0023] (Side member 20) The side members 20 are provided in pairs on both sides of the floor panel 12 in the vehicle width direction. The pair of side members 20 are arranged substantially parallel to each other and extend in the vehicle longitudinal direction. The outer ends of the floor panel 12 in the vehicle width direction are joined to the side members 20, for example, by spot welding.

[0024] (Crossmember 30) The cross member 30 is composed of a first cross member 31, a second cross member 32, and a center cross member 33.

[0025] <First Cross Member 31> The first cross members 31 are provided in pairs, left and right, between the side members 20 and the floor tunnel 14. The pair of first cross members 31 are provided on the upper side of the floor panel 12. The pair of first cross members 31 are provided at approximately the same position in the longitudinal direction of the vehicle, extending in the vehicle width direction. The first cross members 31 are formed in a substantially U-shape in cross-section, open to the lower side of the vehicle.

[0026] The first cross member 31 is provided to span between the side member 20 and the floor tunnel 14. The outer end of the first cross member 31 in the vehicle width direction is joined to the side member 20 by, for example, spot welding. The inner end of the first cross member 31 in the vehicle width direction is joined to the floor tunnel 14 by, for example, spot welding. The flange portion at the opening of the first cross member 31 is joined to the floor panel 12 by, for example, spot welding. As a result, a closed cross-sectional shape is formed by the first cross member 31 and the floor panel 12.

[0027] <2nd Cross Member 32> The second cross member 32 is located further rearward than the first cross member. The second cross member 32 is provided in pairs, left and right, between the side member 20 and the floor tunnel 14. The pair of second cross members 32 are located on the upper side of the floor panel 12. The pair of second cross members 32 are located at approximately the same position in the longitudinal direction of the vehicle and extend in the width direction of the vehicle. The second cross member 32 is formed in a roughly U-shape with a cross section that is open to the lower side of the vehicle.

[0028] The second cross member 32 is provided to span between the side member 20 and the floor tunnel 14. The outer end of the second cross member 32 in the vehicle width direction is joined to the side member 20, for example, by spot welding. The inner end of the second cross member 32 in the vehicle width direction is joined to the floor tunnel 14, for example, by spot welding. The flange portion at the opening of the second cross member 32 is joined to the floor panel 12, for example, by spot welding. As a result, a closed cross-sectional shape is formed by the second cross member 32 and the floor panel 12.

[0029] <Center Cross Member 33> The center cross member 33 is located further rearward than the second cross member 32. The center cross member 33 is positioned to span between a pair of side members 20. The center cross member 33 is located on the upper side of the floor panel 12. The center cross member 33 has a roughly crank-shaped cross section.

[0030] The outer end of the center cross member 33 in the vehicle width direction is joined to the side member 20, for example, by spot welding. The front end of the center cross member 33 is joined to the rear end of the floor panel 12, for example, by spot welding.

[0031] (Brace 40) The diagonal braces 40 are provided in pairs, left and right, between the side members 20 and the floor tunnel 14. The pair of diagonal braces 40 are provided in the longitudinal direction of the vehicle, between the second cross member 32 and the center cross member 33.

[0032] The diagonal brace 40 is formed in a substantially rectangular plate shape, with the plate thickness direction being in the vertical direction of the vehicle. The diagonal brace 40 has a bead 42 formed on it, the cross section of which protrudes upward or downward of the vehicle and extends in the longitudinal direction of the diagonal brace 40.

[0033] The diagonal brace 40 is provided to reinforce the inner corner between the second cross member 32 and the floor tunnel 14. The diagonal brace 40 is provided to bridge the gap between the second cross member 32 and the floor tunnel 14.

[0034] One end of the diagonal brace 50 is located on the vehicle side of the second cross member 32, from the center in the vehicle width direction. The other end of the diagonal brace 50 is connected to the flange portion of the opening of the second cross member 32, for example, by spot welding. The other end of the diagonal brace 50 is located approximately midway between the second cross member 32 and the center cross member 33 in the vehicle's longitudinal direction. The other end of the diagonal brace 50 is connected to the floor panel 12, for example, by spot welding.

[0035] The diagonal brace 50 is installed at an angle with respect to the vehicle's longitudinal direction, such that it moves inward in the vehicle's width direction as it approaches the rear of the vehicle.

[0036] (First underfloor brace 50) The first underbody brace 50 is formed in a substantially rectangular plate shape with the plate thickness direction being in the vertical direction of the vehicle. The first underbody brace 50 extends in the vehicle width direction and connects the left side 14B and the right side 14C.

[0037] The first underbody brace 50 is located below the vehicle in the floor tunnel 14. The first underbody brace 50 is located at the rear of the vehicle relative to the second cross member 32. Both ends of the first underbody brace 50 are located approximately midway between the second cross member 32 and the center cross member 33 in the longitudinal direction of the vehicle. In other words, both ends of the first underbody brace 50 are located near the other end of the diagonal brace 50. Thus, the diagonal brace 50 is provided to connect the first underbody brace 50 and the second cross member 32. The ends of the first underbody brace 50 may also be joined to the other end of the diagonal brace 50.

[0038] [Effect] Incidentally, as shown in Figure 3, in the case of a vehicle body structure 510 without a diagonal brace 50, when a pole (collision body) P collides with the vehicle body structure 510 from the outside in the vehicle width direction toward the inside in the vehicle width direction (so-called pole side impact), the side member 20 is bent inward in the vehicle width direction, starting from the point where the pole P collides with the side member 20.

[0039] In this case, the collision load is transmitted to the second cross member 32 via the side member 20, causing the floor tunnel 14 to bend inward in the vehicle width direction.

[0040] The vehicle body structure 10 according to the first embodiment includes a floor tunnel 14 that rises upward from the floor panel 12 and extends in the longitudinal direction of the vehicle, a pair of side members 20 provided on both sides of the floor panel 12 in the vehicle width direction and extending in the longitudinal direction of the vehicle, a second cross member 32 that extends in the vehicle width direction and connects the floor tunnel 14 and the side members 20, and a first underbody brace 50 provided below the floor tunnel 14 of the vehicle, and a diagonal brace 40 that connects the first underbody brace 50 and the second cross member 32 to the second cross member 32, It is equipped with (see Figure 1).

[0041] By providing a diagonal brace 40 connecting the first underfloor brace 50 and the second cross member 32, as shown in Figure 2, during a side collision of the vehicle (especially a pole impact), the load transmitted from the second cross member 32 is distributed from the diagonal brace 40 to the first underfloor brace 50. Therefore, the concentration of load on the floor tunnel 14 is avoided, and the deformation of the floor tunnel 14 is suppressed. As a result, inward displacement in the vehicle width direction during a side collision of the vehicle can be suppressed.

[0042] Incidentally, as shown in Figure 3, if the diagonal brace 40 is not provided, during a side collision of the vehicle (especially a pole collision), the load transmitted from the second cross member 32 will not be distributed but will be transmitted to the floor tunnel 14. As a result, the load will concentrate on the floor tunnel 14, causing it to deform. In addition, the second cross member 32 will deform in a way that causes it to bend towards the floor tunnel 14. As a result, the relative displacement between the second cross member 32 and the center cross member 33 will increase, potentially causing cracks in the floor panel.

[0043] In the vehicle body structure 10 according to the first embodiment, the diagonal brace 40 is provided between a center cross member 33 that spans the side members 20 and extends in the vehicle width direction, and a side member 20 provided in front of the center cross member 33 (see Figure 1).

[0044] The diagonal brace 40 is positioned between the center cross member 33, which spans the side members 20 and extends in the vehicle width direction, and the side members 20 located in front of the center cross member 33. As shown in Figure 2, during a side collision of the vehicle (especially a pole impact), the load transmitted from the second cross member 32 is distributed from the diagonal brace 40 to the first underfloor brace 50. This prevents the concentration of load on the floor tunnel 14 and suppresses deformation of the floor tunnel 14. Furthermore, deformation that causes the second cross member 32 to bend towards the floor tunnel 14 is suppressed. As a result, the relative displacement between the second cross member 32 and the center cross member 33 is suppressed, preventing cracks from forming in the floor panel.

[0045] Furthermore, by providing the diagonal brace 40, deformation of the floor panel 12 in the out-of-plane direction is suppressed. Therefore, the occurrence of cracks in the floor panel 12 can be further suppressed.

[0046] In the vehicle body structure 10 according to the first embodiment, the diagonal brace 40 is provided on the vehicle side from the center of the second cross member 32 in the vehicle width direction (see Figure 1).

[0047] The diagonal brace 40 is positioned on the inside of the vehicle from the center of the second cross member 32 in the vehicle width direction, which reduces the size of the diagonal brace 40. As a result, a vehicle body structure with reduced weight can be achieved.

[0048] In the vehicle body structure 10 according to the first embodiment, a bead 42 is formed on the diagonal brace 40 (see Figure 1).

[0049] The bracing brace 40 has a bead 42 formed on it, which improves the rigidity of the bracing brace 40 compared to when the bracing brace 40 does not have a bead 42. As a result, the deformation of the floor tunnel 14 is further suppressed.

[0050] [Second Embodiment] The body structure of the second embodiment differs from that of the first embodiment in that the arrangement of the underbody braces is different.

[0051] The vehicle body structure of the second embodiment will be described below. In addition, the same terms or reference numerals will be used to describe parts that are the same as or equivalent to those described in the first embodiment.

[0052] [composition] As shown in Figure 4, the vehicle body structure 110 is equipped with a second underbody brace 52 as an underbody brace. The second underbody brace 52 is formed in a substantially rectangular plate shape with the plate thickness direction being in the vertical direction of the vehicle. The second underbody brace 52 extends in the vehicle width direction and connects the left side 14B and the right side 14C.

[0053] The second underbody brace 52 is located below the floor tunnel 14. The second underbody brace 52 is located at approximately the same position as the second cross member 32 in the longitudinal direction of the vehicle. As a result, the second cross member 32 is configured to connect with the second underbody brace 52.

[0054] [Effect] In the vehicle body structure 110 according to the second embodiment, a second underbody brace 52 is provided below the floor tunnel 14 of the vehicle, connecting one second cross member 32 and the other second cross member 32 (see Figure 4).

[0055] A second underbody brace 52 is provided beneath the floor tunnel 14, connecting one second cross member 32 to the other second cross member 32. This allows the load transmitted from the second cross member 32 to be distributed to the second underbody brace 52 during a side collision (especially a pole collision). As a result, the concentration of load on the floor tunnel 14 is avoided, and deformation of the floor tunnel 14 is suppressed. Consequently, inward displacement in the vehicle width direction during a side collision can be suppressed.

[0056] Furthermore, the other configurations and effects are substantially the same as those of the first embodiment described above, so their explanation will be omitted.

[0057] The vehicle body structure according to the embodiments has been described above based on the first and second embodiments. However, the specific configuration is not limited to these embodiments, and design changes are permitted as long as they do not deviate from the gist of the invention as described in each claim of the patent claims.

[0058] In the first and second embodiments, the bracing brace 40 was shown to be provided to span between the second cross member 32 and the floor tunnel 14. However, the bracing brace may also be provided to span between other cross members and the floor tunnel. [Explanation of Symbols]

[0059] 10. Body structure 12 Floor Panels 14 Floor Tunnel 20 Side Members 32. Second crossmember (an example of a crossmember) 33. Center cross member (an example of a cross member) 40. Bracing braces 42 Bead 50. First underfloor brace (an example of an underfloor brace) 52. Second underfloor brace (an example of an underfloor brace)

Claims

1. A floor tunnel rises from the floor panel upwards towards the vehicle and extends in the longitudinal direction of the vehicle, A pair of side members are provided on both sides of the floor panel in the vehicle width direction and extend in the vehicle longitudinal direction, A cross member extending in the vehicle width direction connects the floor tunnel and the side member, An underbody brace provided below the vehicle in the floor tunnel, wherein the underbody brace provided at the front or rear of the vehicle is provided with respect to the cross member, A bracing brace connecting the underfloor brace and the cross member, Equipped with, The aforementioned bracing brace has a bead formed on it. Vehicle body structure.

2. The bracing is provided between a center cross member that spans the side members and extends in the vehicle width direction, and the side members provided in front of the center cross member. The vehicle body structure according to claim 1.

3. The aforementioned bracing is provided on the vehicle side of the cross member, from the center in the vehicle width direction. The vehicle body structure according to claim 1.

4. Below the floor tunnel of the vehicle, a second underbody brace is provided, connecting one of the aforementioned cross members to the other aforementioned cross member. The vehicle body structure according to claim 1.

Images