JP7600960B2 - Vehicle floor structure - Google Patents

Description

The present invention relates to a vehicle floor structure that reinforces the recessed portion of the floor panel from the underside of the floor and includes an underfloor framework member that is provided with a jack-up point.

A technology related to a vehicle floor structure is described in Patent Document 1. As shown in FIG. 7, the vehicle floor structure described in Patent Document 1 includes a rear floor panel 100. The rear floor panel 100 includes a flat floor panel main body 102 and a recessed portion 103 formed in a state recessed downward from the floor panel main body 102. The recessed portion 103 of the rear floor panel 100 is a portion for storing a spare tire T horizontally, and is connected to the floor panel main body 102 via a floor cross member 105. The floor cross member 105 is a skeletal member extending in the vehicle width direction, and reinforces the rear floor panel 100 by supporting the rear portion of the floor panel main body 102 of the rear floor panel 100 and the peripheral flange portion 103f of the recessed portion 103 from below.

Furthermore, a jack-up bracket 107 with a jack-up point is attached to the center of the floor cross member 105 in the vehicle width direction. The jack-up bracket 107 is formed with a roughly U-shaped side, and a load receiving portion 107j (jack-up point) that receives the jack-up load F is formed on the bottom plate portion. A diagonal flange portion 107u is formed on the upper front end of the jack-up bracket 107, which is joined to the front side surface of the floor cross member 105. A horizontal flange portion 107f is formed on the rear end of the jack-up bracket 107, which is joined to the front underside surface of the recessed portion 103 of the rear floor panel 100.

JP 2008-074358 A

In the above-described vehicle floor structure, the jack-up load F is applied to the front side of the floor cross member 105 via the diagonal flange portion 107u of the jack-up bracket 107, and to the front underside of the recessed portion 103 of the rear floor panel 100 via the horizontal flange portion 107f. When the jack-up load F is applied to the front underside of the recessed portion 103 of the rear floor panel 100, the jack-up load F pushes up the front underside of the recessed portion 103. For this reason, the jack-up load F tends to cause the bent portion W between the side plate and the bottom plate of the recessed portion 103 to be easily deformed so as to be bent. In other words, stress is concentrated at the bent portion W of the recessed portion 103 of the rear floor panel 100, reducing the durability of the recessed portion 103 of the rear floor panel 100.

The present invention was made to solve the above problems, and the problem that the present invention aims to solve is to suppress stress concentration on the curved part of the recessed molding part of the floor panel when a jack-up load is applied.

The above problems are solved by each invention. The first invention is a floor structure for a vehicle having a floor panel body and a recessed portion formed in a state recessed downward from the floor panel body, an underfloor framework member that reinforces the recessed portion of the floor panel from the underfloor side and has a jack-up point, and an above-floor reinforcement member that reinforces the floor panel from the above-floor side between the floor panel body and the recessed portion and is partly joined to the underfloor framework member via the floor panel, the recessed portion of the floor panel has a peripheral flange portion formed on the periphery of the recess, a side wall portion that is bent downward relative to the peripheral flange portion, and a bent portion formed between the peripheral flange portion and the side wall portion, the peripheral flange portion of the recessed portion is joined to the edge flange portion of the above-floor reinforcement member, and the edge flange portion of the above-floor reinforcement member has a protruding flange portion that covers the peripheral flange portion of the recessed portion across the bent portion to the side wall portion and is joined to the underfloor framework member via the recessed portion.

According to the present invention, the edge flange portion of the above-floor reinforcement member is provided with an overhanging flange portion that covers the peripheral flange portion of the recessed portion of the floor panel, straddling the bent portion, and extending to the side wall portion, and is joined to the underfloor framework member via the recessed portion. In other words, the bent portion of the recessed portion of the floor panel is reinforced by being sandwiched between the overhanging flange portion of the above-floor reinforcement member and the underfloor framework member. Therefore, when a jack-up load is applied to the recessed portion of the floor panel via the underfloor framework member, stress concentration on the bent portion of the recessed portion can be suppressed.

According to the second invention, the underfloor framework member extends in the vehicle front-rear direction at the center position in the vehicle width direction and has flange portions on both sides in the width direction, and the above-floor reinforcement member extends in the vehicle width direction, and a pair of protruding flange portions protruding rearward from the rear edge flange portion of the above-floor reinforcement member are joined to the flange portions on both sides of the underfloor framework member via the recessed molding portion of the floor panel. In other words, the bent portion of the recessed molding portion of the floor panel is reinforced by being sandwiched between the protruding flange portion of the above-floor reinforcement member and the flange portion of the underfloor framework member.

According to the third invention, the overhanging flange portion of the above-floor reinforcement member is wider than the flange portion of the underfloor framework member, and a portion of the overhanging flange portion that protrudes outward in the width direction relative to the flange portion of the underfloor framework member is joined to a recessed portion of the floor panel.

According to the fourth invention, the underfloor framework member has an L-shaped side section that reinforces the front of the recessed portion of the floor panel, and a flange section located at the top of the front end reinforces the bent section of the recessed portion and its vicinity, and the jack-up point is provided on the underside of the front of the underfloor framework member.

This invention makes it possible to suppress stress concentration at the curved portion of the recessed portion of the floor panel when a jack-up load is applied.

1 is an overall perspective view of an underfloor of a vehicle equipped with a floor structure according to a first embodiment of the present invention, viewed obliquely from below and front. 2 is an enlarged perspective view (enlarged perspective view taken along the line II in FIG. 1 ) illustrating a rear floor front cross member, a central frame, and a jack-up point in the floor structure of the vehicle; FIG. 3 is a vertical cross-sectional view (cross-sectional view taken along the line III-III in FIG. 2 ) showing a rear floor front cross member, a central frame, and a jack-up point in the floor structure of the vehicle. FIG. FIG. 4 is an enlarged view taken along the arrow IV in FIG. 3 . 5 is a plan view of FIG. 4 as viewed from the V direction (below the underfloor). 6 is a plan view of FIG. 4 as viewed from the VI direction (from above the room side). FIG. 1 is a vertical cross-sectional view showing a conventional vehicle floor structure.

[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 6. The vehicle floor structure according to this embodiment is a rear floor structure for a vehicle that is provided with a jack-up point in the center in the vehicle width direction under the rear floor of the vehicle. Here, front, rear, left, right, and up and down in the figures correspond to front, rear, left, right, and up and down of the vehicle.

<Overview of the rear underfloor of the vehicle 10>
As shown in FIG. 1 and other figures, the floor panel 11 constituting the floor surface of the rear part of the vehicle 10 includes a substantially flat floor panel main body 11f and a recessed portion 110 formed in a state recessed downward from the floor panel main body 11f (in a state protruding downward in FIG. 1). As shown in FIG. 1, floor side members 12 extending in the longitudinal direction of the vehicle are provided on the lower side (under the floor) of the floor panel 11 (floor panel main body 11f) of the vehicle 10. The floor side members 12 are connected to rear side members 14 extending in the longitudinal direction of the vehicle at the rear positions of a rear wheel house 13 in which a rear wheel (not shown) is housed. In addition, rocker rails 16 extending in the longitudinal direction of the vehicle between a front wheel house (not shown) and the rear wheel house 13 are provided on the left and right ends of the lower side of the floor panel 11 on the outer side of the floor side members 12 in the vehicle width direction. Here, pillars (not shown), such as a front pillar, a center pillar, and a rear pillar, which support a roof panel (not shown) of the vehicle 10 are provided upright on the rocker rail 16 .

As shown in FIG. 1, a floor cross member 17 is provided between the left and right floor side members 12 at the rear end of the rocker rail 16, extending in the vehicle width direction (left-right direction). Outriggers 17r are provided on the extension lines of the floor cross member 17, connecting the left and right floor side members 12 to the left and right rocker rails 16. A rear cross member 18 is provided on the rear side of the floor cross member 17, extending in the vehicle width direction, connecting the left and right floor side members 12. A rear floor front cross member 19 is provided between the connection between the left floor side member 12 and the rear side member 14 and the connection between the right floor side member 12 and the rear side member 14, extending in the vehicle width direction.

As shown in Figs. 1 to 3, the recessed portion 110 of the floor panel 11 is provided in the area surrounded by the rear floor front cross member 19 and the left and right rear side members 14. The recessed portion 110 of the floor panel 11 is formed in a state where it is recessed downward by a certain dimension with respect to the floor panel main body portion 11f, and for example, a spare tire T is stored horizontally. In addition, the center portion in the vehicle width direction of the recessed portion 110 of the floor panel 11 is reinforced from below by a center frame 20 that extends from the position of the rear floor front cross member 19 toward the rear of the vehicle. The center frame 20 is composed of an L-shaped front portion 20e that covers the front end of the recessed portion 110 of the floor panel 11 in a substantially L-shaped side, and a rear extension portion 20y that extends rearward along the lower flat portion of the recessed portion 110.

As shown in FIG. 1 and other figures, the base ends of the left and right rod-shaped braces 30 connected to the rear ends of the left and right rocker rails 16 are fixed to the underside of the L-shaped front part 20e of the central frame 20. The rod-shaped braces 30 are members for improving the torsional rigidity of the rear part of the vehicle body. As shown in FIG. 3, the base ends of the left and right braces 30 are fixed to the underside of the L-shaped front part 20e of the central frame 20 by bolts B via a connecting plate 34. The connecting plate 34 has a lower flange part 34d formed by bending the periphery of the connecting plate 34 downward by a certain amount. A cover plate 40 is fixed to the inside of the lower flange part 34d of the connecting plate 34 in a state where it is fitted from below. As shown in FIG. 3, the cover plate 40 is a member for reinforcing the connecting plate 34 and protecting the head of the bolt B, and the underside of the cover plate 40 is the jack-up point where the push-up fitting 53 of the rear garage jack 50 abuts.

<Specific configuration of recess forming portion 110 of floor panel 11>
As shown in Figures 2 and 3, the recess forming portion 110 of the floor panel 11 is composed of a curved side wall portion 112 that is curved so that the outside is convex, and a semicircular, approximately flat bottom plate portion 113 (see Figure 1) surrounded by the curved side wall portion 112. A peripheral flange portion 112f is formed on the upper peripheral edge of the curved side wall portion 112 of the recess forming portion 110, as shown in Figures 3 and 4. Here, the curved side wall portion 112 of the recess forming portion 110 of the floor panel 11 is bent downward with respect to the peripheral flange portion 112f, and a ridge line K of the bent portion (hereinafter referred to as the bent portion K, see Figures 2, 4, etc.) is formed between the peripheral flange portion 112f and the curved side wall portion 112 along the peripheral flange portion 112f. Peripheral flange portion 112f of recessed portion 110 of floor panel 11 is joined in a sandwiched state between rear end flange portions 192y, 194y (described later) of the rear floor front cross member 19.

<Regarding rear floor front cross member 19>
As shown in Figs. 3 and 4, the rear floor front cross member 19 is a member that reinforces the floor panel 11 by connecting the rear end flange portion 11w of the floor panel main body portion 11f of the floor panel 11 to the peripheral flange portion 112f of the recessed portion 110. The rear floor front cross member 19 is composed of an upper panel 192 on the floor upper side (inside the vehicle) and a lower panel 194 on the floor lower side. The upper panel 192 and the lower panel 194 have front end flange portions 192x, 194x at their front end edges and rear end flange portions 192y, 194y at their rear end edges. The front end flange portion 192x and the rear end flange portion 192y of the upper panel 192 are aligned with and joined to the front end flange portion 194x and the rear end flange portion 194y of the lower panel 194, respectively, so that the rear floor front cross member 19 is formed into a cylindrical shape extending in the vehicle width direction. In addition, a rectangular protruding flange portion 192z is formed on the rear end flange portion 192y of the upper panel 192 on the upper floor side (inside the room) so as to protrude downward and rearward at a position corresponding to the flange portion of the central frame 20 (described later), as shown in Figures 4 and 6.

<Regarding the central frame 20>
As shown in Fig. 2 and other figures, the central frame 20 is formed into a groove shape with an angular cross section, and is made up of a bottom plate portion 22 and side plate portions 23 bent upward on both the left and right sides of the bottom plate portion 22. A flange portion 24f bent outward in the width direction is formed on the upper end edge of the side plate portion 23 of the central frame 20. Here, in the L-shaped front portion 20e of the central frame 20, as shown in Fig. 3, the bottom plate portion 22 is curved into a substantially L-shape on the side, and a flange portion 24f is formed at the upper end position of the bottom plate portion 22. The flange portion 24f of the bottom plate portion 22 is joined in a state where it is sandwiched between the rear end flange portions 192y, 194y of the rear floor front cross member 19.

The left and right side plate portions 23 in the L-shaped front portion 20e of the central frame 20 are formed in an approximately triangular shape to match the shape of the bottom plate portion 22, which has an approximately L-shaped side, and the lower surface of the recessed portion 110 of the floor panel 11, as shown in FIG. 3 and other figures. The flange portions 24f formed on the edges of the left and right side plate portions 23 are joined in a state where they are aligned with the lower surface of the recessed portion 110 of the floor panel 11. Here, the flange portions 24f at the upper end of the bottom plate portion 22 in the L-shaped front portion 20e of the central frame 20 and the flange portions 24f at the edges of the left and right side plate portions 23 are formed in a continuous state, as shown in FIG. 5. Similarly, the flange portions 24f of the left and right side plate portions 23 in the rear extension portion 20y of the central frame 20 are also joined to the lower surface of the recessed portion 110 of the floor panel 11.

<Joining procedure for rear floor front cross member 19, recessed portion 110, and central frame 20>
First, as shown in Figures 1 to 3, the underside of the recess forming portion 110 of the floor panel 11 is reinforced by the central frame 20. That is, the central frame 20 is placed at the central position in the vehicle width direction of the recess forming portion 110 of the floor panel 11, and as shown in Figure 5, the central frame 20 is positioned so that the flange portion 24f at the upper end of the bottom plate portion 22 of the central frame 20 is overlapped from the outside (lower side) with the peripheral flange portion 112f of the recess forming portion 110. In this state, the flange portion 24f at the upper end of the bottom plate portion 22 of the central frame 20 and the flange portions 24f at the edges of the left and right side plate portions 23 are joined to the recess forming portion 110 of the floor panel 11 by, for example, spot welding or the like.

Next, as shown in Figures 4 and 5, the rear end flange portion 194y of the lower panel 194 on the underfloor side of the rear floor front cross member 19 is overlapped from below with the flange portion 24f at the upper end of the bottom plate portion 22 of the central frame 20 and the peripheral flange portion 112f of the recessed portion 110 of the floor panel 11. In this state, the rear end flange portion 194y of the rear floor front cross member 19 (lower panel 194) is joined to the flange portion 24f of the central frame 20 and the peripheral flange portion 112f of the recessed portion 110 of the floor panel 11 by spot welding or the like.

Next, as shown in Figures 4 and 6, the rear end flange portion 192y of the upper panel 192 on the interior side of the rear floor front cross member 19 is overlapped from above onto the peripheral flange portion 112f of the recess molding portion 110 of the floor panel 11. At this time, the upper panel 192 is positioned so that the left and right protruding flange portions 192z of the upper panel 192 overlap the flange portions 24f of the left and right side plate portions 23 of the central frame 20. Then, as shown in Figure 6, the left and right protruding flange portions 192z of the upper panel 192 cover from the peripheral flange portion 112f of the recess molding portion 110 of the floor panel 11 across the bent portion K to the upper portion of the curved side wall portion 112, and overlap the flange portions 24f of the left and right side plate portions 23 of the central frame 20 via the recess molding portion 110.

Here, the left and right width dimensions of the overhanging flange portion 192z of the upper panel 192 are configured to be larger than the width dimensions of the flange portion 24f of the side plate portion 23 of the central frame 20, as shown in FIG. 6. Therefore, the left and right overhanging flange portions 192z and 192z of the upper panel 192 overhang outward in the width direction (outward in the left and right direction) from the left and right flange portions 24f of the side plate portion 23 of the central frame 20, respectively. The overhanging flange portion 192z of the upper panel 192 and the flange portion 24f of the side plate portion 23 of the central frame 20 are joined by spot welding or the like via the recessed portion 110 of the floor panel 11. In addition, the portion of the overhanging flange portion 192z of the upper panel 192 that does not overlap with the flange portion 24f of the central frame 20 is joined to the recessed portion 110 of the floor panel 11 by spot welding or the like. Furthermore, the rear end flange portion 192y of the upper panel 192 is joined by spot welding or the like to the peripheral flange portion 112f of the recessed portion 110 of the floor panel 11, the flange portion 24f at the upper end of the bottom plate portion 22 of the center frame 20, and the rear end flange portion 194y of the lower panel 194.

As a result, the bent portion K of the recessed portion 110 of the floor panel 11 is reinforced by being sandwiched between the overhanging flange portion 192z of the rear floor front cross member 19 (upper panel 192) and the flange portion 24f of the side plate portion 23 of the central frame 20, as shown in FIG. 4.

<About the function of the above floor structure>
As shown in Figure 3, when a jack-up load F is applied to the jack-up point (the underside of the cover plate 40), the jack-up load F is applied in a direction pushing up the front part of the recessed portion 110 of the floor panel 11 via the flange portion 24f of the L-shaped front portion 20e of the central frame 20. As a result, a stress is applied to the bent portion K (see Figure 4) between the peripheral flange portion 112f and the curved side wall portion 112 of the recessed portion 110 of the floor panel 11, which increases the bending of the bent portion K. However, as shown in Figures 4 and 5, the bent portion K and its vicinity are reinforced by being sandwiched from above and below by the flange portion 24f of the central frame 20 and the protruding flange portion 192z of the rear floor front cross member 19 (upper panel 192). For this reason, even if a jack-up load is applied to the front portion of the recess forming portion 110 of the floor panel 11, stress that would increase the bending of the bent portion K of the recess forming portion 110 is unlikely to be applied. This improves the durability of the recess forming portion 110 of the floor panel 11.

<Correspondence between terms used in this embodiment and terms in the present invention>
The rear floor front cross member 19 (upper panel 192) in this embodiment corresponds to the above-floor reinforcement member of the present invention, and the rear end flange portion 192y of the upper panel 192 corresponds to the edge flange portion of the above-floor reinforcement member. The bent portion K of the recess molding portion 110 of the floor panel 11 corresponds to the bent portion of the recess molding portion of the floor panel of the present invention. The central frame 20 in this embodiment corresponds to the underfloor framework member of the present invention. Furthermore, the connecting plate 34 fixed to the underside of the central frame 20 and the cover plate 40 correspond to the jack-up point of the present invention. The curved side wall portion 112 of the recess molding portion 110 of the floor panel 11 corresponds to the side wall portion of the recess molding portion of the floor panel of the present invention.

<Advantages of the vehicle floor structure according to this embodiment>
According to the vehicle floor structure of this embodiment, the rear end flange portion 192y of the upper panel 192 (above-floor reinforcement member) of the rear floor front cross member 19 is provided with an overhanging flange portion 192z that covers the peripheral flange portion 112f of the recess forming portion 110 of the floor panel 11 across the bent portion K to the curved side wall portion 112 (side wall portion) and is joined to the flange portion 24f of the central frame 20 (underfloor framework member) via the recess forming portion 110. That is, the bent portion K of the recess forming portion 110 of the floor panel 11 is reinforced by being sandwiched between the overhanging flange portion 192z of the upper panel 192 and the flange portion 24f of the central frame 20. Therefore, when a jack-up load is applied to the recess forming portion 110 of the floor panel 11 via the central frame 20, stress concentration on the bent portion K of the recess forming portion 110 can be suppressed.

<Example of change>
Here, the present invention is not limited to the above embodiment, and modifications are possible within the scope of the present invention. For example, in the present embodiment, the recessed portion 110 of the floor panel 11 having the bent portion K with a ridge line is exemplified. However, the present invention can also be applied to the recessed portion 110 having a bent portion with a circular arc cross section, for example, without a ridge line, instead of the bent portion K with a ridge line. Also, an example has been shown in which a pair of protruding flange portions 192z of the rear floor front cross member 19 (upper panel 192) are provided at positions corresponding to the left and right flange portions 24f of the central frame 20. However, it is also possible to form the left and right protruding flange portions 192z of the rear floor front cross member 19 (upper panel 192) wide while connecting them. Furthermore, in the present embodiment, the upper panel 192 of the rear floor front cross member 19 is exemplified as the above-floor reinforcing member. However, it is also possible to use a cross member other than the rear floor front cross member 19, or another frame member, as the above-floor reinforcing member. In addition, in this embodiment, the central frame 20 extending in the front-rear direction of the vehicle is exemplified as the underfloor framework member. However, for example, an underfloor frame extending in the vehicle width direction may also be used as the underfloor framework member.

10: Vehicle 11: Floor panel 11f: Floor panel main body 110: Recessed portion 112: Curved side wall portion (side wall portion)
112f: Peripheral flange portion K: Bending portion (curved portion)
19. Rear floor front cross member (above-floor reinforcement member)
192: Upper panel (floor reinforcement member)
192z: protruding flange portion 192y: rear end flange portion (edge flange portion)
20: Central frame (underfloor framework member)
24f: Flange portion 34: Connection plate (jack-up point)
40: Cover plate (jack-up point)

Claims (4)

A floor structure for a vehicle, comprising: a floor panel including a floor panel main body portion and a recessed portion formed in a state recessed downward with respect to the floor panel main body portion; an underfloor framework member that reinforces the recessed portion of the floor panel from the underside of the floor and that has a jack-up point; and an above-floor reinforcement member that reinforces the floor panel from the aboveside of the floor between the floor panel main body portion and the recessed portion and that is partly joined to the underfloor framework member via the floor panel,
The recess molding portion of the floor panel includes a peripheral flange portion formed on the periphery of the recess, a side wall portion bent downward relative to the peripheral flange portion, and a bent portion formed between the peripheral flange portion and the side wall portion, and the peripheral flange portion of the recess molding portion is joined to the edge flange portion of the above-floor reinforcement member,
A vehicle floor structure in which an end edge flange portion of the above-floor reinforcement member is provided with an overhanging flange portion that covers from the peripheral flange portion of the recess molding portion across the bent portion to the side wall portion and is joined to the underfloor framework member via the recess molding portion. 2. A vehicle floor structure according to claim 1,
the underfloor framework member extends in a vehicle front-rear direction at a center position in a vehicle width direction and has flange portions on both sides in the width direction,
The above-floor reinforcement member extends in the vehicle width direction, and a pair of protruding flange portions protruding rearward from the rear edge flange portion of the above-floor reinforcement member are joined to the flange portions on both sides of the under-floor framework member via recessed molding portions of the floor panel, in a vehicle floor structure. 3. A vehicle floor structure according to claim 2,
A vehicle floor structure in which the protruding flange portion of the above-floor reinforcement member is configured to be wider than the flange portion of the underfloor framework member, and a portion of the protruding flange portion that protrudes widthwise outward from the flange portion of the underfloor framework member is joined to a recessed portion of the floor panel. A vehicle floor structure according to claim 2 or 3,
The underfloor framework member has an L-shaped side surface in a portion that reinforces the front portion of the recessed portion of the floor panel, and a flange portion located at the upper front end reinforces the bent portion of the recessed portion and its vicinity,
A vehicle floor structure, wherein the jack-up point is provided on the front underside of the underfloor framework member.

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