Vehicle bottom structure

Abstract

To provide a vehicle bottom part structure which fixes an impact absorption material as a component different from a rocker, to the interior of the rocker easily and securely.SOLUTION: A vehicle bottom part structure includes: a rocker 30 which is elongated in a vehicle fore and aft direction; an impact absorption material 60 in which multiple small spaces 64 are arranged in a vehicle width direction and which is disposed in an internal space 36 of the rocker 30; and a drill machine screw 70 which mechanically fastens an outer end surface as seen in a vehicle width direction of the rocker 30 to the impact absorption material 60 from the outer side of the rocker 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a vehicle underbody structure in which a shock absorbing material is arranged in the internal space of a rocker. [Background technology]

[0002] A pair of rockers extending in the front-to-rear direction of the vehicle are provided at the bottom of the vehicle and at both ends in the vehicle width direction. Some proposals have been made to place impact absorbing material inside the rockers to absorb collision loads input from the sides of the vehicle.

[0003] For example, Patent Document 1 discloses a technology in which an impact absorbing material is provided inside a rocker. In Patent Document 1, the impact absorbing material has a shape like a series of small spaces connected in the vehicle width direction. In other words, the cross-sectional shape of the impact absorbing material is like a ladder spanning between the outer and inner parts of the rocker. According to the technology of Patent Document 1, in the event of a side collision, the impact absorbing material undergoes plastic deformation, thereby effectively absorbing the collision load input from the side. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-025935 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, the shock absorbing material is formed integrally with the rocker. In this case, the shape of the rocker itself becomes complex, and the manufacturing cost of the rocker increases. Therefore, it is possible to manufacture the shock absorbing material as a separate part from the rocker, and then place and fix this shock absorbing material inside the rocker. However, until now, there has been no technology to easily and reliably fix a shock absorbing material manufactured as a separate part from the rocker inside the rocker.

[0006] Therefore, this specification discloses a vehicle underbody structure in which a shock absorbing material, which is a separate part from the rocker, is easily and reliably fixed inside the rocker. [Means for solving the problem]

[0007] The vehicle bottom structure disclosed in this specification is characterized by comprising a rocker that is long in the fore-and-aft direction of the vehicle, an impact absorbing material having multiple small spaces arranged in the vehicle width direction, the impact absorbing material being placed in the internal space of the rocker, and a fastening member that mechanically fastens the outer end face of the rocker in the vehicle width direction and the impact absorbing material from the outside of the rocker.

[0008] This configuration allows the shock absorbing material, which is a separate part from the rocker, to be easily fixed inside the rocker. Furthermore, by mechanically fastening the shock absorbing material with fastening members, the shock absorbing material is firmly fixed to the rocker, so that the shock absorbing material will not separate from the rocker even if it is subjected to a collision load from the side.

[0009] In this case, the vehicle may further include a floor cloth extending in the vehicle width direction and having its vehicle width direction end connected to the rocker, and the impact absorbing material may be positioned at a height position that passes through the centroid of the floor cloth and collides with a centroid passing line that is parallel to the vehicle width direction.

[0010] This structure allows the collision energy that is not fully absorbed by the impact absorbing material to be efficiently transmitted to the floor cloth. By transmitting the collision energy to the highly rigid floor cloth, the amount of inward movement of the rocker in the vehicle width direction and, ultimately, the amount of penetration of the colliding obstacle into the passenger compartment can be reduced.

[0011] In this case, a high-voltage member may further be provided below the floor cloth and disposed adjacent to the inside of the rocker in the vehicle width direction.

[0012] In the event of a side collision, the highly rigid floor cloth braces the rocker, preventing it from moving inward in the vehicle width direction. By locating the high-voltage member below the floor cloth, it is possible to effectively prevent the rocker from interfering with the high-voltage member in the event of a side collision.

[0013] Furthermore, the vehicle may further include a rocker molding that covers the rocker from the outside in the vehicle width direction, and the fastening member may fasten the rocker molding, the outside end face of the rocker in the vehicle width direction, and the impact absorbing material.

[0014] With this configuration, in the event of a side collision, the rocker molding is destroyed by the collision load without separating from the rocker. Furthermore, part of the collision energy is consumed in the destruction of the rocker molding, so the collision energy transmitted to the impact absorbing material can be reduced.

[0015] The shock absorbing material may also be an extruded metal product.

[0016] With this configuration, an impact absorbing material having a series of small spaces can be manufactured easily and inexpensively.

[0017] The fastening member may also be a one-sided fastening member that can fasten two or more objects together by working from one side.

[0018] With this configuration, the shock absorbing material can be fastened to the rocker without forming an opening in the shock absorbing material for accessing the interior thereof, thereby preventing a decrease in the strength of the shock absorbing material. [Effects of the Invention]

[0019] According to the technology disclosed in this specification, the impact absorbing material, which is a separate part from the rocker, can be easily and reliably fixed inside the rocker. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic perspective view of a vehicle. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] FIG. 3 is an enlarged view of part B in FIG. 2. [Figure 4] FIG. [Figure 5]FIG. 10 is a view showing a state in which the impact absorbing material is adhesively fixed to the rocker. [Figure 6] 10A and 10B are diagrams showing how a female screw is formed on the side surface of the impact absorbing material. [Figure 7] 10A and 10B are diagrams showing how a nut is fixed to a side surface of the impact absorbing material. [Figure 8] 10A and 10B are diagrams showing how a nut is fixed to a side surface of the impact absorbing material. [Figure 9] 10A and 10B are diagrams showing other fastening forms of the impact absorbing material. DETAILED DESCRIPTION OF THE INVENTION

[0021] The vehicle underside structure will be described below with reference to the drawings. Fig. 1 is a schematic perspective view of a vehicle 10. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is an enlarged view of part B in Fig. 2. In each figure, "Fr," "Up," and "Rh" indicate the front, upper, and right side of the vehicle 10, respectively.

[0022] The vehicle 10 of this example is an electric vehicle equipped with a motor (not shown) as one of its driving power sources. As shown in FIG. 1, a floor panel 50 that functions as the floor surface of the passenger compartment is provided at the bottom of the vehicle 10. A floor cloth 52 that is long in the vehicle width direction is fixed to the upper surface of this floor panel 50. In this example, two floor cloths 52 are provided spaced apart in the front-to-rear direction of the vehicle. The floor cloths 52 are frame members that form part of the vehicle body. The floor cloths 52 have a generally hat-shaped cross section that opens downward. A portion of the floor cloth 52 that corresponds to the hat-shaped flange is joined to the floor panel 50 by welding. As a result, a closed space that is generally rectangular in cross section and long in the vehicle width direction is formed between the floor cloth 52 and the floor panel 50.

[0023] A pair of rockers 30 (not visible in FIG. 1, see FIG. 2) are provided on both the left and right ends of the floor panel 50. The rockers 30 are frame members that form part of the vehicle body and are long in the longitudinal direction of the vehicle. As shown in FIG. 2, the rocker 30 is formed by joining together a rocker inner 32, a rocker outer 34, and a rocker reinforcement 38 (hereinafter referred to as "rocker RF 38"). An impact absorbing material 60 is arranged in the internal space 36 of this rocker 30, which will be described later. The vehicle width direction ends of the floor panel 50 and the vehicle width direction ends of the floor cross 52 both extend to and are joined to the rocker 30.

[0024] A rocker molding 40 is disposed on the outer side of the rocker 30 in the vehicle width direction. The rocker molding 40 is a resin part that decoratively decorates the rocker 30. The rocker molding 40, the rocker 30, and the shock absorbing material 60 are fastened together with drill screws 70 (see FIG. 3), which will also be described later.

[0025] An undercover 56 (not visible in FIG. 1, see FIG. 2) is also provided below the floor panel 50 with a gap therebetween. A battery 54 is disposed between the undercover 56 and the floor panel 50. The battery 54 is a main battery that supplies power to the motor, which is the driving power source, and stores power generated within the vehicle or supplied from outside the vehicle. The battery 54 can also be considered a high-voltage component that charges and discharges high-voltage power. As is clear from FIG. 2, in this example, the battery 54 is disposed adjacent to the locker 30.

[0026] As shown in FIG. 1, two door openings 12 are formed in a line at the front and rear above the rocker molding 40. These door openings 12 are covered by side doors 20 (not shown in FIG. 1, see FIG. 2) in a manner that allows them to be opened and closed freely. As shown in FIG. 2, the side doors 20 are formed by joining a door inner panel 24 and a door outer panel 22. The height of the bottom ends of the side doors 20 is approximately the same as the height of the bottom ends of the rockers 30. Therefore, when the side doors 20 are closed, the rockers 30 are covered and hidden by the side doors 20, and when the side doors 20 are open, the rockers 30 (more precisely, the rocker moldings 40 that cover the rockers 30) are exposed to the outside of the vehicle.

[0027] Next, the configuration around the rocker 30 will be described in detail. As described above, the rocker 30 is a frame member that is long in the vehicle longitudinal direction, and is formed by joining the rocker inner 32, the rocker outer 34, and the rocker RF 38. The rocker inner 32 has a generally hat-shaped cross section that opens outward in the vehicle width direction. The rocker outer 34 also has a generally hat-shaped cross section that opens inward in the vehicle width direction. Hereinafter, the portions of the rocker inner 32 and the rocker outer 34 that correspond to the "brim" of the hat will be referred to as "flanges," the portions that correspond to the rising portion of the hat will be referred to as "top surface" and "bottom surface," and the portions that correspond to the top surface of the hat will be referred to as "side surface."

[0028] The flanges of the rocker inner 32 and the rocker outer 34 are overlapped and joined together in the vehicle width direction. As a result, an internal space 36 that is generally rectangular in cross section and elongated in the vehicle front-to-rear direction is formed inside the rocker 30. A floor cloth 52 is joined to the top surface of the rocker inner 32, a floor panel 50 is joined to the side surface of the rocker inner 32, and an undercover 56 is joined to the bottom surface of the rocker inner 32.

[0029] The rocker RF38 is provided to reinforce the rocker 30. The rocker RF38 externally covers the top and side surfaces of the rocker outer 34 and has a generally L-shaped cross section. The rocker RF38 is joined to the upper flange and side surfaces of the rocker outer 34, respectively.

[0030] The rocker molding 40 covers the side and bottom surfaces of the rocker 30 from the outside, and has a generally L-shaped cross section. The rocker molding 40 is fastened to the rocker 30 with drill screws 70. To enable fastening with the drill screws 70, a plurality of fastening ledges 42 are formed on the inner surface of the rocker molding 40 in the vehicle width direction, which surface faces the side surface of the rocker RF 38.

[0031] FIG. 4 is a perspective view of the fastening tower 42 and its surroundings. As shown in FIG. 4, the fastening tower 42 is a generally arch-shaped portion having a bridge portion 42b spanning between a pair of legs 42a extending from the inner surface of the rocker molding 40 in the vehicle width direction toward the inside in the vehicle width direction. In this example, the pair of legs 42a are spaced apart in the vertical direction, and the bridge portion 42b extends in the vertical direction. The fastening tower 42 is molded integrally with the main body of the rocker molding 40. Between the bridge portion 42b and the main body, there is a working space that penetrates in the fore-and-aft direction of the vehicle. The size of this working space is such that a fingertip or a tool can be inserted.

[0032] A fastening notch 44 is formed from the rear end edge of the bridge portion 42b and extends toward the front of the vehicle. The vertical width of this fastening notch 44 is larger than the diameter of the shank 70b of the drill screw 70 and smaller than the diameter of the head 70a of the drill screw 70. When fixing the impact absorbing material 60 to the rocker molding 40 and the rocker 30, the shank 70b of the drill screw 70 is slidably inserted into the fastening notch 44 from the rear.

[0033] An impact absorbing material 60 is fixed to the internal space 36 of the rocker 30. The impact absorbing material 60 is an extruded member that is long in the longitudinal direction of the vehicle and is made of a metal such as aluminum. The dimension of this impact absorbing material 60 in the vehicle width direction is approximately the same as or slightly smaller than the dimension of the internal space 36 in the vehicle width direction. The internal space of the impact absorbing material 60 is divided by a plurality of partition walls 62 that are spaced apart in the vehicle width direction. Therefore, within the impact absorbing material 60, a plurality of small spaces 64 are lined up in the vehicle width direction. In the event of a side collision, the impact absorbing material 60 absorbs the impact by plastically deforming so as to be compressed in the vehicle width direction.

[0034] The impact absorbing material 60 is provided at approximately the same height as the floor cloth 52. More specifically, if a line passing through the centroid of the floor cloth 52 and parallel to the vehicle width direction is defined as a "centroid passing line Fh," the impact absorbing material 60 is provided at a height that hits the centroid passing line Fh, as shown in Figure 2. In this example, the impact absorbing material 60 is provided at a position where its vertical center is at approximately the same height as the centroid passing line Fh.

[0035] As stated previously, the shock absorbing material 60, rocker 30, and rocker molding 40 are fastened together by a drill screw 70. The drill screw 70 is a screw with a drill-shaped tip. As the drill screw 70 advances, drilling a hole in the object with the drill tip, it forms a female thread around the periphery of the hole and screws into the female thread. Such a drill screw 70 can be considered a type of one-sided fastening member that can fasten two or more objects together by simply working from the head 70a side.

[0036] To enable fastening using the drill screw 70, the rocker molding 40 is formed with a fastening rudders 42. Furthermore, pilot holes are formed in the side surfaces of the rocker reinforcement 38 and the rocker outer 34, allowing the shank 70b of the drill screw 70 to pass through. During fastening, the tip of the drill screw 70 that has passed through the fastening rudders 42, the rocker reinforcement 38, and the rocker outer 34 drills a hole in the side surface of the impact absorbing material 60 and forms a female thread on the inner circumferential surface of the hole. Note that, as shown in FIG. 2, the drill screw 70 is fastened only from the outside in the vehicle width direction. Therefore, the impact absorbing material 60 is cantilevered inside the rocker 30, with only its outer end in the vehicle width direction fastened to the rocker 30.

[0037] As described above, the rocker 30 and the impact absorbing material 60 are long components extending in the longitudinal direction of the vehicle. To stably fasten the rocker 30 and the impact absorbing material 60 together, the drill screws 70 are fastened at multiple locations spaced apart in the longitudinal direction of the vehicle. The locations and number of these fastening locations are not particularly limited as long as the impact absorbing material 60 can be stably fastened. In this example, the drill screws 70 are fastened at least at locations that coincide with the floor cross 52 in the longitudinal direction. In other words, in this example, the drill screws 70 and the floor cross 52 are aligned in a substantially straight line in the vehicle width direction. This configuration allows a collision load input from the side to be more reliably transmitted to the floor cross 52.

[0038] It should be noted that the above-described fastening operation of the impact absorbing material 60 needs to be performed with the impact absorbing material 60 properly positioned relative to the rocker outer 34. It is difficult to perform such positioning after the rocker outer 34 and the rocker inner 32 have been joined together. Therefore, typically, before joining the rocker inner 32 and the rocker outer 34, the rocker outer 34 and the impact absorbing material 60 are fastened together with drill screws 70, and then the rocker inner 32 and the rocker outer 34 are joined together. However, of course, if the impact absorbing material 60 can be temporarily fixed to the rocker outer 34 in advance (for example, by adhesive fixation), it is also possible to join the rocker outer 34 and rocker inner 32 together after this temporary fixation, and then mechanically fasten the impact absorbing material 60 to the rocker outer 34 using drill screws 70 or the like.

[0039] Next, the reason for the above configuration will be explained. As described above, in this example, the impact absorbing material 60 is fixed inside the rocker 30. With this configuration, in the event of a side collision in which an obstacle collides with the side of the vehicle, the impact energy is effectively absorbed by the impact absorbing material 60. That is, when subjected to a collision load directed inward in the vehicle width direction, the side door 20 and the rocker 30 are compressed and crushed in the vehicle width direction. At this time, the impact absorbing material 60 inside the rocker 30 also undergoes plastic deformation so as to be compressed in the vehicle width direction. This plastic deformation effectively absorbs the collision energy.

[0040] Any collision energy that cannot be absorbed by the impact absorbing material 60 is further transmitted to and absorbed by the floor cloth 52. Because the floor cloth 52 is a highly rigid frame member, even if collision energy is transmitted to the floor cloth 52, the floor cloth 52 does not deform significantly and attempts to maintain its shape. As a result, even if the rocker 30 attempts to move inward in the vehicle width direction, the floor cloth 52 braces itself, preventing the rocker 30 from moving inward in the vehicle width direction. As a result, the amount of obstacles that enter the vehicle compartment can be reduced, and interference between the rocker 30 and the battery 54 (i.e., high-voltage component) can be effectively suppressed.

[0041] In this example, as mentioned previously, the impact absorbing material 60 is fastened to the rocker 30 with drill screws 70. In other words, the impact absorbing material 60 is mechanically fastened to the rocker 30. This configuration is used to prevent the posture of the impact absorbing material 60 from changing significantly in the event of a side collision.

[0042] That is, instead of mechanical fastening, it is also possible to fasten the impact absorbing material 60 to the rocker 30 using an adhesive. When using an adhesive, the fastening process is simpler than when using mechanical fastening. However, adhesives have weaker fastening strength than when using mechanical fastening. Furthermore, the bonding strength of adhesives is prone to variation depending on factors such as the thickness of the adhesive application and the temperature and humidity conditions during curing. Therefore, when the impact absorbing material 60 is fastened to the rocker 30 with an adhesive, the adhesive is likely to peel off due to the collision load during a side collision. For example, when the impact absorbing material 60 is adhesively fastened to the rocker 30, as shown in FIG. 5, the impact load F1 during a side collision could cause the adhesive to peel off between the impact absorbing material 60 and the rocker outer 34, potentially tilting the impact absorbing material 60 so that the outer end of the impact absorbing material 60 in the vehicle width direction slides downward.

[0043] Here, during a side collision, the collision load F1 input to the rocker 30 is directed inward in the vehicle width direction. If the posture of the impact absorbing material 60 is tilted as shown in Figure 5, the arrangement direction of the small spaces 64 will be tilted relative to the input direction of the collision load, and the small spaces 64 will not be able to be sufficiently crushed by the collision load F1. As a result, the impact absorbing material 60 will not be able to sufficiently absorb the collision energy. Furthermore, if the impact absorbing material 60 is tilted, the load transmission direction from the impact absorbing material 60 to the floor cross 52 (i.e., the arrangement direction of the small spaces 64) will be tilted relative to the input direction of the collision load F1, and the load F2 transmitted to the floor cross 52 will be reduced. As a result, the collision load F1 cannot be efficiently transmitted to the floor cross 52, and there is a risk that the floor cross 52 will not be able to absorb the collision load F1.

[0044] On the other hand, in this example, as described above, the impact absorbing material 60 and the rocker 30 are mechanically fastened using drill screws 70. The bonding strength achieved by mechanical fastening is significantly greater than that achieved by adhesive. Therefore, with this configuration, the bond between the impact absorbing material 60 and the rocker 30 will not be released even when a collision load F1 is applied. As a result, the impact absorbing material 60 can efficiently absorb the collision load F1 input from the side, and the collision load F1 that cannot be fully absorbed by the impact absorbing material 60 can be efficiently transmitted to the floor cross member 52.

[0045] Furthermore, in this example, in addition to the rocker 30, the rocker molding 40 is also fastened to the impact absorbing material 60. With this configuration, the rocker molding 40 can also absorb side impact energy during a side impact. In other words, if the rocker molding 40 and the impact absorbing material 60 are not connected, the rocker molding 40 may receive the collision load F1 during a side impact and slide off the impact absorbing material 60. In this case, the impact energy is transmitted to the impact absorbing material 60 without being consumed by the destruction of the rocker molding 40. In other words, the impact energy transmitted to the impact absorbing material 60 increases.

[0046] On the other hand, by mechanically fastening the rocker molding 40 to the impact absorbing material 60, the rocker molding 40 can easily maintain a fixed state relative to the impact absorbing material 60 even when subjected to a collision load F1. In this case, part of the collision energy is consumed to destroy the rocker molding 40, so the collision energy transmitted to the impact absorbing material 60 can be reduced.

[0047] The configuration described so far is merely an example, and other configurations may be changed as appropriate as long as the impact absorbing material 60 is disposed inside the rocker 30 and the impact absorbing material 60 and the rocker 30 are mechanically fastened from the outside in the vehicle width direction. For example, in the example described above, in addition to the rocker 30, the rocker molding 40 is also fastened to the impact absorbing material 60. However, the rocker molding 40 and the impact absorbing material 60 do not have to be fastened together. Furthermore, the impact absorbing material 60 may have other shapes as long as the small spaces 64 are aligned in the vehicle width direction. Furthermore, as long as the impact absorbing material 60 is located inside the rocker 30, the height at which it is disposed may also be changed as appropriate.

[0048] In the above description, the impact absorbing material 60 and the rocker 30 are fastened together using a drill screw 70. However, the impact absorbing material 60 and the rocker 30 may be fastened together using other fastening members. For example, a female thread may be formed in advance on the side surface of the impact absorbing material 60, and the impact absorbing material 60 and the rocker 30 may be threadedly fastened together using this female thread. In this case, the female thread is formed only from the outside of the impact absorbing material 60. For example, as shown in FIG. 6, burring may be performed on the side surface of the impact absorbing material 60, and a female thread may be formed on the inner circumferential wall of a hole 66 formed by the burring using a tapping tool 80. In another embodiment, as shown in FIG. 7, a through hole may be formed in the side surface of the impact absorbing material 60, a flanged nut 82 may be inserted into the through hole, and the flange 82a may be welded to the side surface of the impact absorbing material 60. In another embodiment, as shown in FIG. 8, a through hole may be formed in the side surface of the impact absorbing material 60, and a pop nut 84 may be attached to the through hole. The Pop Nut 84 is shaped like a flanged nut. The Pop Nut 84 is inserted into the through-hole, the male thread 86a of the jig 86 is screwed into the female thread of the Pop Nut 84, and the head of the Pop Nut 84 is pressed down with the body 86b of the jig 86. When the male thread 86a is pulled outward, a portion of the Pop Nut 84 deforms and bulges outward. This bulging portion and the flange of the Pop Nut 84 sandwich the side surface of the impact absorbing material 60, thereby securing the Pop Nut 84 to that side surface.

[0049] The impact absorbing material 60 and the rocker 30 may also be fastened together using a fastening member other than a screw. For example, the impact absorbing material 60 and the rocker 30 may also be fastened together using a blind rivet, a clip, or the like. While the above description has used one-sided fastening members that can be fastened from one side, other fastening members may also be used. For example, as long as the strength of the impact absorbing material 60 can be sufficiently ensured, an access opening 68 may be formed in a portion of the impact absorbing material 60, as shown in FIG. 9, and the impact absorbing material 60 may be fastened to the rocker 30 by inserting a hand or a tool into the access opening 68. In this case, general fastening members, such as a bolt 88 and a nut 90, may be used. [Explanation of symbols]

[0050] 10 vehicle, 12 door opening, 20 side door, 22 door outer, 24 door inner, 30 rocker, 32 rocker inner, 34 rocker outer, 36 interior space, 38 rocker RF, 40 rocker molding, 42 fastening turret, 44 fastening notch, 50 floor panel, 52 floor cloth, 54 battery, 56 under cover, 60 shock absorber, 62 bulkhead, 64 small space, 68 access opening, 70 drill screw, 80 tapping tool, 82, 90 nut, 84 pop nut, 86 jig, 88 bolt.

Claims

1. A long rocker in the front-rear direction of the vehicle; An impact absorbing material having a plurality of small spaces arranged in a vehicle width direction, the impact absorbing material being disposed in an internal space of the rocker; a fastening member that mechanically fastens the outer end surface of the rocker in the vehicle width direction and the impact absorbing material from the outside of the rocker; a rocker molding that covers the rocker from the outer side in the vehicle width direction; Equipped with The fastening member fastens the rocker molding, the outer end surface of the rocker in the vehicle width direction, and the impact absorbing material. A vehicle underbody structure comprising:

2. The vehicle underbody structure according to claim 1, further comprising: A floor cross member extends in a vehicle width direction and has a vehicle width direction end connected to the rocker, The impact absorbing material is disposed at a height position where it passes through the centroid of the floor cloth and hits a centroid passing line parallel to the vehicle width direction. A vehicle underbody structure comprising:

3. The vehicle underbody structure according to claim 2, further comprising: A vehicle underside structure comprising a high-voltage member disposed below the floor cloth and adjacent to the inside of the rocker in the vehicle width direction.

4. A vehicle underbody structure according to any one of claims 1 to 3, A vehicle underbody structure, characterized in that the shock absorbing material is a metal extrusion.

5. A vehicle underbody structure according to any one of claims 1 to 4, A vehicle underbody structure, characterized in that the fastening member is a one-sided fastening member that can fasten two or more objects to each other by working from one side.

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