Vehicle floor part structure

Abstract

To prevent a collision load from being easily applied to peripheral parts located on an inner side of a vehicle body in the vehicle width direction via a step plate, a link mechanism, and the like at the time of application of the collision load.SOLUTION: A vehicle floor part structure is provided with a movable step device 50 installed at the position of a door opening of a vehicle body, and includes support mechanisms 53, 54 that support a step plate 51 so that the step plate can be moved between a storage position and a use position, connecting mechanisms 58, 59 that connect the support mechanisms 53, 54 to a floor part 43 of the vehicle body, and detachment mechanisms 54u, 54h that release the connecting mechanisms 58, 59 from the connected state and detach the step plate 51 and the support mechanisms 53, 54 from the vehicle body 43 when a collision load is applied to the step plate 51 and the support mechanisms 53, 54 in a direction that pushes the step plate and the support mechanisms toward the vehicle body.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a floor structure for a vehicle that is provided with a movable step device that is installed at the position of a door opening of a vehicle body. [Background technology]

[0002] A conventional technology relating to a vehicle floor structure is described in Patent Document 1. In the vehicle floor structure described in Patent Document 1, a movable step device 120 is installed at the position of a sliding door opening 110 of a vehicle body 100, as shown in Fig. 14. In addition, a fuel tank 105 is installed under the floor of the vehicle body 100, on the inner side in the vehicle width direction of the step device 120 (on the left side of the drawing), at approximately the same height as the step device 120.

[0003] The step device 120 includes a link mechanism 125 that supports the step plate 122 so that it can move between a storage position and a use position, and a bracket 127 that supports the link mechanism 125 so that it can rotate horizontally. The outer side of the bracket 127 in the vehicle width direction is connected to the lower part of the rocker 112 that constitutes the vehicle body 100 by a side support 127s. The upper part of the bracket 127 is connected to the floor member 114 that constitutes the floor part of the vehicle body 100 by an upper support 127u.

[0004] With the above configuration, when a side collision load F is applied to the sliding door D, the deformation of the floor panel 111 causes the upper part of the rocker 112 to move inward in the vehicle width direction (see arrow), and the lower part of the rocker 112 to move relatively outward in the vehicle width direction. This prevents the step device 120 connected to the lower part of the rocker 112 from colliding with the fuel tank. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-237364 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a side collision load F is applied to the step plate 122 of the step device 120, the link mechanism 125 and the bracket 127 are pushed inward in the vehicle width direction by the side collision load F via the step plate 122. This may cause the link mechanism 125 and the bracket 127 to collide with the fuel tank 105. In other words, the side collision load F is applied to the fuel tank 105 via the link mechanism 125 of the step device 120, etc.

[0007] The present invention has been made to solve the above-mentioned problems, and the problem that the present invention aims to solve is to make it difficult for a collision load, when applied, to be applied to peripheral parts arranged on the inside of the vehicle body in the vehicle width direction via a step plate, a link mechanism, etc. [Means for solving the problem]

[0008] The above-mentioned problems are solved by the following inventions. The first invention is a floor structure for a vehicle equipped with a movable step device installed at the door opening of the vehicle body, comprising: a support mechanism that supports a step plate so that the step plate can move between a storage position and an in-use position; a connecting mechanism that connects the support mechanism to the floor of the vehicle body; and a detaching mechanism that releases the connecting mechanism and detaches the step plate and the support mechanism from the vehicle body when a collision load is applied to the step plate and the support mechanism in a direction that pushes them toward the vehicle body.

[0009] According to the present invention, when a collision load is applied to the step plate and the support mechanism in a direction pushing them toward the vehicle body, the release mechanism releases the connection state of the connecting mechanism, causing the step plate and the support mechanism to separate from the vehicle body. In other words, when a collision load is applied to the door, step plate, etc., the support mechanism of the step plate comes off the vehicle body. As a result, the collision load is less likely to be applied to peripheral components installed on the inside of the vehicle body in the vehicle width direction via the step plate and the support mechanism.

[0010] According to a second aspect of the present invention, the support mechanism includes a link mechanism that supports the step plate so that it can move between a storage position and a use position, and a bracket that is connected to the vehicle body by a connecting mechanism while supporting the link mechanism. The release mechanism includes a connection release structure that releases the connection state of the connecting mechanism when a collision load is applied, and a guide mechanism that guides the bracket so that it releases downward from the floor of the vehicle body. In other words, when a collision load is applied, the step plate, link mechanism, and bracket release downward from the floor of the vehicle body. This makes it less likely that the link mechanism, bracket, etc. of the step device will collide with surrounding parts of the vehicle body during a collision.

[0011] According to the third aspect of the present invention, the connection release structure that releases the connection state of the connection mechanism is provided on the bracket.

[0012] According to a fourth aspect of the present invention, a battery is fixed to the floor of the vehicle body by a battery fixing member at a height equal to that of the step plate, on the inner side in the vehicle width direction of the step plate, and the guide mechanism includes an inclined lower surface formed on the battery fixing member and an inclined upper surface of the bracket that abuts against the inclined lower surface of the battery fixing member when subjected to the collision load. Therefore, due to the action of the guide mechanism, the link mechanism and the bracket are released downward along the inclined lower surface of the battery fixing member in the event of a collision. [Effects of the Invention]

[0013] According to the present invention, when a collision load is applied, the collision load is less likely to be applied to peripheral components arranged on the inner side of the vehicle body in the vehicle width direction via the step plate, link mechanism, etc. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view of a vehicle equipped with a floor structure according to a first embodiment of the present invention. [Figure 2] 2 is a schematic perspective view showing a step device that constitutes the floor structure of the vehicle. FIG. [Figure 3] 1 is a vertical cross-sectional view showing a floor structure of a vehicle with a sliding door closed. [Figure 4] FIG. 2 is a plan view of the step device with the step plate in a retracted position. [Figure 5] FIG. 2 is a plan view of the step device with a step plate in a use position. [Figure 6] FIG. 3 is a perspective view of a front support bracket constituting the step device, as viewed from above. [Figure 7] 7 is a vertical cross-sectional view (cross-sectional view taken along arrows VII-VII in FIG. 6) showing a connecting mechanism at an outer portion of the front support bracket in the vehicle width direction. [Figure 8] FIG. 2 is a perspective view of a rear support bracket constituting the step device, as viewed from above. [Figure 9] 9 is a longitudinal cross-sectional view (cross-sectional view taken along arrows IX-IX in FIG. 6) illustrating a coupling mechanism and a coupling release structure at inner portions of the front support bracket and the rear support bracket in the vehicle width direction. [Figure 10] 10 is a vertical cross-sectional view illustrating the function of the connection release structure of the vehicle width direction inner portions of the front support bracket and the rear support bracket when a collision load is applied. FIG. [Figure 11] 10 is a longitudinal cross-sectional view (cross-sectional view taken along the line XI-XI in FIG. 6) illustrating the coupling mechanism, the coupling release structure, and the guide mechanism of the outer portions of the front support bracket and the rear support bracket in the vehicle width direction. [Figure 12]10 is a vertical cross-sectional view illustrating the operation of the connection release structure of the vehicle width direction outer portions of the front support bracket and the rear support bracket, and the operation of the guide mechanism when a collision load is applied. FIG. [Figure 13] FIG. 2 is a vertical cross-sectional view showing the function of the vehicle floor structure (uncoupling structure, guide mechanism) when a collision load is applied. [Figure 14] FIG. 10 is a vertical cross-sectional view showing a conventional vehicle floor structure. DETAILED DESCRIPTION OF THE INVENTION

[0015] [Embodiment 1] A vehicle floor structure according to a first embodiment of the present invention will be described below with reference to Figures 1 to 13. The vehicle floor structure according to this embodiment is a floor structure that provides side collision protection for a vehicle that is equipped with a movable step device 50 at the position of the rear door opening 12 of the vehicle body 10 and that further has a large battery 40 mounted under the floor of the vehicle body 10. Here, the front, rear, left, right, and top and bottom shown in the figures correspond to the front, rear, left, right, and top and bottom of a vehicle that is equipped with the floor structure according to this embodiment.

[0016] <Overview of Vehicle Body 10> As shown in Fig. 1, a front door opening 11 corresponding to the front seats and a rear door opening 12 corresponding to the center and rear seats are formed on the right side of the vehicle body 10. The front door opening 11 is configured to be openable and closable by a front door 15, and the rear door opening 12 is configured to be openable and closable by a sliding door 16 that can slide in the fore-and-aft direction of the vehicle. As shown in the vertical cross-sectional view of Fig. 3, a rocker 30, which is a cylindrical frame extending in the fore-and-aft direction of the vehicle, is provided at the lower edges of the front door opening 11 and the rear door opening 12. Note that a description of the left side of the vehicle body 10 will be omitted.

[0017] As shown in Figure 3, the rocker 30 is made up of an inner rocker 31, an upper outer rocker 33, a lower outer rocker 34, and a side outer 35 that covers the outer surface of the upper outer rocker 33. The upper outer rocker 33 is fitted to the upper part of the inner rocker 31 from the outside in the vehicle width direction, thereby forming a cylindrical upper frame that extends in the fore-and-aft direction of the vehicle at the top of the rocker 30. The lower outer rocker 34 is fitted to the lower part of the inner rocker 31 from the outside in the vehicle width direction, thereby forming a cylindrical lower frame that extends in the fore-and-aft direction of the vehicle at the bottom of the rocker 30.

[0018] 3, a space S for accommodating the lower guide roller unit 16r of the sliding door 16 is formed between the upper outer rocker 33 and the lower outer rocker 34 so as to extend in the longitudinal direction of the vehicle. Furthermore, a lower guide rail 33r, into which the rollers (not shown) of the lower guide roller unit 16r are fitted so as to be able to roll, is provided on the ceiling portion of the space S, i.e., the underside of the upper outer rocker 33, so as to extend in the longitudinal direction of the vehicle.

[0019] As shown in Figure 3, the upper joint flange portion (figure number omitted) between the rocker inner 31, upper rocker outer 33, and side outer 35 is covered by a body-side weatherstripping 17 that seals the gap between the sliding door 16 and the rear door opening 12 of the vehicle body 10. In addition, a floor panel 12f is secured by welding or the like to the upper left corner of the rocker inner 31 in a state where it is overlapped from above. An interior-side fixing step 12s is provided so as to cover the body-side weatherstripping 17, the top surface of the rocker 30, and the floor panel 12f.

[0020] As shown in FIG. 3, a large battery 40 is installed under the floor of the vehicle body 10 at a position on the inside (left side) of the locker 30 in the vehicle width direction. The large battery 40 is fixed to the underside of the locker 30 by a battery fixing member 43 using a fastening mechanism (not shown). In other words, since the battery fixing member 43 is integrated with the locker 30, it can be considered to be part of the vehicle body 10. The battery fixing member 43 not only fixes the large battery 40 to the vehicle body 10 (locker 30), but is also configured to absorb energy equivalent to the weight of the large battery 40 when subjected to a side collision load F (see FIG. 13). As shown in FIGS. 3 and 4, the battery fixing member 43 is a box-shaped aluminum molded product extending in the vehicle fore-and-aft direction. As shown in FIG. 3, the internal space of the battery fixing member 43 is divided into multiple sections in the vehicle width direction by vertical wall members extending in the vehicle fore-and-aft direction.

[0021] As shown in FIG. 3, the vertical thickness of the battery fixing member 43 is relatively small at the lower rocker section and relatively large at the left end (inner portion in the vehicle width direction). The lower surface of the battery fixing member 43 is formed with an inclined lower surface 43d between the lower rocker section and the left end, which is inclined so that the inner portion in the vehicle width direction is lower. The lower surface of the left end of the battery fixing member 43 supports the right end (outer end in the vehicle width direction) of a protective panel 45 that covers the underside of the large battery 40. The outer side surface (right end surface 43r) of the battery fixing member 43 in the vehicle width direction is held flush with the outer side surface of the lower outer rocker 34, and this portion is covered by the vertical wall portion of the outer fixed step 12z, as shown in FIG. 2 and FIG. 3. A receiving surface (illustration number omitted) against which the door-side weather strip 16w of the sliding door 16 abuts is formed at the upper portion of the outer fixed step 12z, as shown in FIG. 3.

[0022] <Overview of the Movable Step Device 50> As shown in FIG. 3, the movable step device 50 is fixed to the underside of the battery fixing member 43. As shown in FIGS. 2 to 5, the step device 50 includes a step plate 51, a link mechanism 53 that supports the step plate 51 so that it can move between a storage position and a use position, and a front support bracket 54 and a rear support bracket 55 (see FIG. 4, etc.) that are connected to the battery fixing member 43 while supporting the link mechanism 53. When the step plate 51 is in the storage position, as shown in FIG. 3, the step plate 51 is stored below the outer fixed step 12z. Note that FIG. 2 shows the state in which the step plate 51 is in the use position. As shown in FIG. 3, the step plate 51 and other components of the step device 50 are held at a height approximately equal to that of the large battery 40. The step device 50 also includes an interlocking mechanism 57 that connects the step plate 51 to the sliding door 16 and interlocks the opening (rearward sliding) of the sliding door 16 with the movement of the step plate 51 toward the use position (outward).

[0023] <Regarding the front support bracket 54> As shown in FIGS. 4 and 5, the front support bracket 54 is a plate-shaped bracket that supports the first link 531 and the second link 532 of the link mechanism 53 in a horizontally rotatable state. The front support bracket 54 is disposed at approximately the center of the rear door opening 12 in the vehicle front-rear direction, and is fixed to the underside of the battery fixing member 43 with four right-side bolts 58 and two left-side bolts 59, as shown in FIG. 3. As shown in FIG. 6, the front support bracket 54 is formed of a steel plate (e.g., approximately 4 mm) that is substantially rectangular in plan view. The front support bracket 54 includes a front protrusion 541, a central protrusion 542, and a rear protrusion 543 that protrude upward. The front protrusion 541, the central protrusion 542, and the rear protrusion 543 are each formed so that their right ends (outer ends in the vehicle width direction) are the uppermost surfaces, and a U-shaped bolt hole 54u is formed at the uppermost surface, which is substantially U-shaped in plan view so that the right side (outer side in the vehicle width direction) is open.

[0024] The front-to-rear width dimension of the central protrusion 542 of the front support bracket 54 is set to be sufficiently larger than those of the front protrusion 541 and the rear protrusion 543, and two U-shaped bolt holes 54u are formed in the central protrusion 542, and one U-shaped bolt hole 54u is each formed in the front protrusion 541 and the rear protrusion 543. In addition, an inclined upper surface 54s is formed on the inside (left side) of the U-shaped bolt hole 54u in the vehicle width direction in the front protrusion 541, the central protrusion 542, and the rear protrusion 543. The inclined upper surface 54s is formed at a position corresponding to the inclined lower surface 43d of the battery fastening member 43, and the inclination angle of the inclined lower surface 43d of the battery fastening member 43 is set to be approximately equal to the inclination angle of the inclined lower surface 43d of the battery fastening member 43.

[0025] 5 to 8, a rotation center hole 54j to which a lower part of a rotation center shaft 531j of a first link 531 is connected is formed approximately midway between the U-shaped bolt hole 54u of the front convex portion 541 of the front support bracket 54 and the U-shaped bolt hole 54u of the central convex portion 542. Furthermore, a rotation center hole 54j to which a lower part of a rotation center shaft 532j of a second link 532 is connected is formed approximately midway between the U-shaped bolt hole 54u of the central convex portion 542 and the U-shaped bolt hole 54u of the rear convex portion 543. Here, an upper part of the rotation center shaft 531j of the first link 531 and an upper part of the rotation center shaft 532j of the second link 532 are connected to a presser plate 56, as shown in FIG. 7 (view taken along arrows VII-VII in FIG. 6). As shown in Figures 7 and 11 (viewed from the arrows XI-XI in Figure 6), the pressure plate 56 is fixed to the underside of the battery fixing member 43 together with the front support bracket 54 by a right-side bolt 58 passed through the U-shaped U-bolt hole 54u of the front support bracket 54.

[0026] As shown in Fig. 6, a left front convex portion 545 that protrudes upward is formed between a front convex portion 541 and a central convex portion 542 at the left end (the inner end in the vehicle width direction) of the front support bracket 54, and a left rear convex portion 546 is formed between the central convex portion 542 and the rear convex portion 543. A potbellied bolt hole 54h consisting of a right large-diameter hole and a left U-shaped hole is formed in the uppermost surface of the left front convex portion 545 and the uppermost surface of the left rear convex portion 546. As shown in Fig. 9 (a view taken along arrows IX-IX in Fig. 6), the front support bracket 54 is fixed together with the protective panel 45 to the lower surface of the left end of the battery fixing member 43 by a left bolt 59 that is passed through the left U-shaped hole of the bolt hole 54h.

[0027] <Regarding rear support bracket 55> As shown in Fig. 4 and other figures, the rear support bracket 55 is a plate-shaped bracket that supports the third link 533 of the link mechanism 53 in a horizontally rotatable state. The rear support bracket 55 is disposed at the rear end position of the rear door opening 12, and as shown in Fig. 4 and other figures, is fixed to the underside of the battery fixing member 43 by two right-side bolts 58 and one left-side bolt 59. As shown in Fig. 8, the rear support bracket 55 is formed from a steel plate (e.g., about 4 mm) that is substantially rectangular in plan view. The rear support bracket 55 has a front protrusion 551 and a rear protrusion 553 that protrude upward.

[0028] 8, the front convex portion 551 and the rear convex portion 553 of the rear support bracket 55 are formed so that their right ends (outer ends in the vehicle width direction) are their uppermost surfaces, and U-shaped bolt holes 55u are formed at the positions of the uppermost surfaces, cut out in a substantially U-shape in plan so that the right side (outer side in the vehicle width direction) is open. The front convex portion 551 and the rear convex portion 553 of the rear support bracket 55 each have an inclined upper surface 55s that is an inclined surface on the inner side (left side) in the vehicle width direction of the U-shaped bolt hole 55u. The inclined upper surface 55s is formed at a position corresponding to the inclined lower surface 43d of the battery fixing member 43, and the inclination angle of the inclined lower surface 43d of the battery fixing member 43 is set to a value approximately equal to the inclination angle of the inclined lower surface 43d of the battery fixing member 43.

[0029] As shown in Fig. 8, a rotation center hole 55j is formed in the rear support bracket 55 at a position approximately midway between the U-shaped bolt hole 55u of the front convex portion 551 and the U-shaped bolt hole 55u of the rear convex portion 553. Here, the upper part of the rotation center shaft 533j of the third link 533 is connected to the presser plate 56, similar to the first link 531 and the second link 532 described above (see Fig. 7). Then, as shown in Figs. 7 and 11, the presser plate 56 is fixed together with the rear support bracket 55 to the underside of the battery fixing member 43 by a right bolt 58 passed through the U-shaped U-shaped bolt hole 55u of the rear support bracket 55.

[0030] A central protrusion 555 that protrudes upward is formed between the front protrusion 551 and the rear protrusion 553 at the left end (the inner end in the vehicle width direction) of the rear support bracket 55. A potbellied bolt hole 55h consisting of a right large-diameter hole and a left U-shaped hole is formed in the uppermost surface of the central protrusion 555. The rear support bracket 55 is fixed together with the protective panel 45 to the underside of the left end of the battery fixing member 43 by a left bolt 59 that is passed through the left U-shaped hole of the bolt hole 55h (see FIG. 9).

[0031] <About link mechanism 53> As shown in FIGS. 4 and 5 , the link mechanism 53 includes a first link 531, a second link 532, a third link 533, and a second tip link 532x connected to the tip of the second link 532 in a horizontally rotatable manner. The rotation center side ends of the first link 531 and the second link 532 are connected to the front support bracket 54 by the rotation center shafts 531j and 532j, as described above. The free rotation end side end of the first link 531 is connected to the front lower surface of the step plate 51 by the tip connecting shaft 531p in a horizontally rotatable manner. The free rotation end side end of the second link 532 is connected to the base end side of the second tip link 532x in a horizontally rotatable manner, and the tip end of the second tip link 532x is connected to the central lower surface of the step plate 51 by the tip connecting shaft 532p in a horizontally rotatable manner. As described above, the end of the third link 533 on the rotation center side is connected to the rear support bracket 55 by the rotation center shaft 533j, and the end of the third link 533 on the rotation free end side is connected to the rear underside of the step plate 51 by the tip connecting shaft 533p in a state where it can rotate horizontally.

[0032] <About Step Board 51> As shown in FIGS. 4 and 5, the step plate 51 is a strip-shaped plate that is long in the front-rear direction and is tapered toward the front end. A roller groove 51m, into which a roller 57r of the interlocking mechanism 57 is rollably fitted, is formed along the outer edge of the step plate 51 on the underside of the step plate 51. When the sliding door 16 slides in the opening direction (rearward sliding), the roller 57r (see FIG. 3) of the interlocking mechanism 57 rolls rearward in the roller groove 51m of the step plate 51, and the step plate 51 is subjected to a pulling force toward the outside in the vehicle width direction. As a result, the first link 531, the second link 532, and the third link 533 of the link mechanism 53 rotate clockwise, and the step plate 51 moves from the storage position (see FIG. 4) to the use position (see FIG. 5) while remaining parallel to the locker 30.

[0033] Furthermore, when the sliding door 16 slides in the closing direction (slides forward) from the fully open position, the roller 57r of the interlocking mechanism 57 rolls forward in the roller groove portion 51m of the step plate 51, and the step plate 51 receives a pressing force from the inside in the vehicle width direction. As a result, the first link 531, the second link 532, and the third link 533 of the link mechanism 53 rotate left, and the step plate 51 is returned to the storage position in a state parallel to the rocker 30.

[0034] <Operation of the vehicle floor structure according to this embodiment during a side collision> As described above, the right ends (outer ends in the vehicle width direction) of the front support bracket 54 and the rear support bracket 55 of the step device 50 are fixed to the underside of the battery fixing member 43 by U-shaped bolt holes 54u, 55u and a right-side bolt 58, as shown in Fig. 11. Also, the left ends (inner ends in the vehicle width direction) of the front support bracket 54 and the rear support bracket 55 are fixed to the underside of the left end of the battery fixing member 43 by a left-side U-shaped hole of bolt holes 54h, 55h and a left-side bolt 59, as shown in Fig. 9. Therefore, the strength of the step device 50 (step plate 51, etc.) in the up-down direction is maintained at a required strength by the right-side bolt 58 and the left-side bolt 59.

[0035] In this state, as shown in FIG. 13 , when a side collision load F is applied to the sliding door 16, the step plate 51, etc., the first link 531 and the second link 532 push the front support bracket 54 inward in the vehicle width direction, i.e., toward the large battery 40. The third link 533 also pushes the rear support bracket 55 inward in the vehicle width direction. This causes the left bolt 59 and the right bolt 58 to move rightward (outward in the vehicle width direction) relative to the front support bracket 54 and the rear support bracket 55. As a result, as shown in FIGS. 10 and 12 , the left bolt 59 and the right bolt 58 are disengaged from the bolt holes 54h, 55h and the U-bolt holes 54u, 55u. That is, the front support bracket 54 and the rear support bracket 55 are disengaged from the battery fixing member 43.

[0036] Then, as shown in FIG. 12, the inclined upper surfaces 54s, 55s of the front support bracket 54 and the rear support bracket 55, which have moved inward in the vehicle width direction, come into contact with the inclined lower surface 43d of the battery fixing member 43 and are guided downward. Also, as shown in FIG. 10, the vehicle width direction end edges (left edges) of the front support bracket 54 and the rear support bracket 55 come into contact with the inclined lower surface 45d of the protection panel 45 and are guided downward. That is, as shown in FIG. 13, the step plate 51, the first to third links 531, 532, 533, the front support bracket 54, and the rear support bracket 55 of the step device 50 disengage from the battery fixing member 43 and move downward. As a result, the step plate 51, the first to third links 531, 532, 533, the front support bracket 54, and the rear support bracket 55 are less likely to collide with the large battery 40 in the event of a side collision.

[0037] <Comparison between terms used in this embodiment and terms related to the present invention> In this embodiment, the link mechanism 53, the front support bracket 54, and the rear support bracket 55 correspond to the support mechanism of the present invention, and the front support bracket 54 and the rear support bracket 55 correspond to the bracket of the present invention. The U-shaped bolt holes 54u, 55u and the left U-shaped holes of the bolt holes 54h, 55h of the front support bracket 54 and the rear support bracket 55, and the right bolt 58 and the left bolt 59 correspond to the coupling mechanism of the present invention. The U-shaped bolt holes 54u, 55u and the bolt holes 54h, 55h of the front support bracket 54 and the rear support bracket 55 correspond to the decoupling structure of the present invention. The inclined upper surfaces 54s, 55s of the front support bracket 54 and the rear support bracket 55, the inclined lower surface 43d of the battery fixing member 43, and the inclined lower surface 45d of the protective panel 45 correspond to the guide mechanism of the present invention. The decoupling structure and the guide mechanism correspond to the detachment mechanism of the present invention. Furthermore, the battery fixing member 43 corresponds to the vehicle body of the present invention.

[0038] <Advantages of the vehicle floor structure according to this embodiment> In the vehicle floor structure according to this embodiment, when a side collision load F is applied to the step plate 51, the link mechanism 53, the front support bracket 54, and the rear support bracket 55 (support mechanism), the decoupling structure (U-shaped bolt holes 54u, 55u, bolt holes 54h, 55h) of the detachment mechanism and the guide mechanism (inclined lower surface 43d, etc.) are activated. This releases the connection between the front support bracket 54 and the rear support bracket 55 and the battery fixing member 43 (vehicle body), causing the step plate 51, the link mechanism 53, the front support bracket 54, and the rear support bracket 55 to detach downward from the vehicle body. This reduces the side collision load F from being applied to the large battery 40, which is installed on the inner side of the vehicle body 10 in the vehicle width direction, via the step plate 51, the link mechanism 53, the front support bracket 54, and the rear support bracket 55. As a result, damage to the large battery 40 can be reduced.

[0039] <Example of change> The present invention is not limited to the above-described embodiment, and modifications are possible within the scope of the present invention. For example, in this embodiment, as shown in FIG. 3, a vehicle is illustrated in which a battery fixing member 43 for fixing a large battery 40 is attached to the underside of the locker 30, and a step device 50 is installed below the battery fixing member 43. In other words, the large battery 40 is illustrated as an example of a peripheral component. However, the configuration of the present invention can also be applied to a vehicle in which the step device 50 is installed below the locker 30, and a peripheral component, for example, a fuel tank, is installed inside the step device 50 in the vehicle width direction. [Explanation of symbols]

[0040] 10. Vehicle body 12 Rear door opening (door opening) 40 Large battery 43 Battery fixing member (vehicle body) 43d...Slanted lower surface (guide mechanism) 45 Protective panel 45d...Slanted lower surface (guide mechanism) 50...Step device 51 Step board 53 Link mechanism (support mechanism) 54 Front support bracket (bracket) 54h···Bolt hole (connection mechanism, disconnection mechanism) 54s... Inclined top surface (guide mechanism) 54u···U-shaped bolt hole (connection mechanism, disconnection structure) 55 Rear support bracket (bracket) 55h···Bolt holes (connection mechanism, disconnection mechanism) 55s···Inclined top surface (guide mechanism) 55u···U-shaped bolt hole (connection mechanism, disconnection structure) 58 Right side bolt (connection mechanism) 59 Left side bolt (connection mechanism) F...Side collision load

Claims

1. A floor structure of a vehicle having a movable step device installed at a door opening position of a vehicle body, a support mechanism that supports the step plate movably between a storage position and a use position; a connecting mechanism that connects the support mechanism to a floor portion of the vehicle body; a detachment mechanism that releases the connection state of the connection mechanism and detaches the step plate and the support mechanism from the vehicle body when a collision load is applied to the step plate and the support mechanism in a direction that pushes them toward the vehicle body; A floor structure of a vehicle having the above structure.

2. 2. A vehicle floor structure according to claim 1, The support mechanism includes a link mechanism that supports the step plate movably between a storage position and a use position, and a bracket that is connected to the vehicle body by the connecting mechanism while supporting the link mechanism. It is equipped with The vehicle floor structure includes a disconnection structure that releases the connection state of the connection mechanism when the collision load is received, and a guide mechanism that guides the bracket so that it disengages downward from the floor of the vehicle body.

3. 3. A vehicle floor structure according to claim 2, A disconnection structure for disconnecting the connecting mechanism is a floor structure of the vehicle that is provided on the bracket.

4. 3. A vehicle floor structure according to claim 2, a battery is fixed to a floor portion of the vehicle body by a battery fixing member at a height equal to that of the step plate, on the inner side of the step plate in the vehicle width direction; The guide mechanism is a vehicle floor structure that includes an inclined lower surface formed on the battery fixing member and an inclined upper surface of the bracket that abuts against the inclined lower surface of the battery fixing member when subjected to the collision load.

Images