JP2019108040A - Vehicle lower part structure - Google Patents

Abstract

To provide a vehicle lower part structure capable of improving the bonding strength between a rocker inner panel and a rocker outer panel.SOLUTION: A vehicle lower structure 10 comprises a rocker inner panel 202, a rocker outer panel 204, and a front pillar inner panel 242. A lower end part 242A of the front pillar inner panel 242 is joined in a state of being sandwiched between an upper flange 202D and an upper flange 204D. The lower end part 242A is provided with an opening 242B penetrating in the thickness direction in a closed cross section 206. A reinforcement member 40 is provided in the closed cross section 206. One end of the reinforcement member 40 is connected to the upper part of the rocker inner panel 202, and the other end of the reinforcement member 40 is connected to the upper part of the rocker outer panel 204 through the opening 242B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle undercarriage.

Patent Document 1 below discloses a vehicle lower structure. In this vehicle lower structure, when a collision load is input from the front side of the vehicle, the rear end of the front pillar reinforcement in the longitudinal direction of the vehicle is in contact with the front end of the rocker outward reinforcement in the longitudinal direction of the vehicle. .
According to the vehicle lower structure configured as described above, the collision load input from the vehicle front side to the front pillar can be efficiently transmitted to the rocker side.

JP 2017-39465 A

In the above-mentioned vehicle lower structure, the flange of the rocker outer panel is joined to the flange of the rocker panel to form a rocker. For example, spot welding is used for joining.
By the way, in the case of a small lap collision or the like, it is assumed that the collision load is locally input to the rocker outer panel through the front tire. There is room for improvement in the joint strength between the rocker outer panel and the rocker panel with respect to such a collision load input.

  The present invention provides a vehicle undercarriage capable of improving the joint strength between the rocker inner panel and the rocker outer panel in consideration of the above facts.

  The vehicle lower structure according to the embodiment of the present invention has a hat-like shape having a first upper flange at the upper end of the vehicle and a first lower flange at the lower end of the vehicle and projecting inward in the vehicle width direction A front panel of the vehicle, a second upper flange joined to the first upper flange at the upper end of the vehicle, and a second lower flange joined to the first lower flange at the lower end of the vehicle; The rocker outer panel is formed in the shape of a hat projecting outward in the vehicle width direction at the vehicle, and the rocker outer panel forming the rocker of the closed cross section with the rocker panel and the lower end portion on the vehicle lower side (2) A front pillar inner panel joined in a state of being sandwiched between the two upper flanges and having an opening penetrating the lower end in the thickness direction in the closed cross section, and disposed in the closed cross section Is, one end portion is joined to the upper portion of the rocker inner panel, and the other end is provided with a reinforcing member joined to the upper portion of the rocker outer panel through the opening.

  The vehicle undercarriage includes a rocker panel, a rocker outer panel, and a front pillar inner panel. The rocker panel has a first upper flange at the upper end of the vehicle and a first lower flange at the lower end of the vehicle, and is formed in a hat shape projecting inward in the vehicle width direction in a front view of the vehicle. The rocker outer panel has a second upper flange joined to the first upper flange at the upper end of the vehicle and a second lower flange joined to the first lower flange at the lower end of the vehicle. It is formed in the shape of a hat projecting outward in the width direction. The rocker outer panel forms a rocker having a closed cross section with the rocker panel. On the lower side of the front pillar inner panel with respect to the vehicle, a lower end having a thickness direction in the vehicle width direction is provided.

Here, in the vehicle lower structure, the lower end portion of the front pillar inner panel is joined in a state of being sandwiched between the first upper flange and the second upper flange. The lower end portion is provided with an opening penetrating in the thickness direction in the closed cross section.
And a vehicle lower part structure is provided with the reinforcement member arrange | positioned in the closed cross section of a rocker. One end of the reinforcing member is joined to the top of the rocker panel, and the other end of the reinforcing member is joined to the top of the rocker outer panel through the opening at the lower end of the front pillar inner panel.
Therefore, for example, when a collision load caused by a small lap collision is locally input to the rocker outer panel through the front tire, the collision load is further transmitted to the rocker panel through the reinforcing member and further to the lower end of the front pillar inner panel. It can be dispersed.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle substructure which can improve the joint strength of a rocker inner panel and a rocker outer panel can be provided.

(A) is a cross-sectional view of the vehicle lower structure according to the first embodiment as viewed from the front side of the vehicle (a cross-sectional view taken along the line A-A in FIG. 2); It is sectional drawing (sectional drawing cut | disconnected by the BB line of FIG. 2) seen from the vehicle front side in another position of the side. FIG. 6 is a side view (an enlarged side view showing a portion indicated by a symbol D shown in FIG. 5 in an enlarged manner) of the vehicle lower structure as viewed from the outer side in the vehicle width direction. FIG. 6 is an exploded perspective view of the vehicle lower structure as viewed from the front side of the vehicle and the outer side in the vehicle width direction and the upper side of the vehicle (an enlarged perspective view showing a portion D indicated in FIG. It is the top view which looked at the above-mentioned vehicle lower part structure from the vehicles upper part side. FIG. 6 is a perspective view of a vehicle skeleton structure to which the above-described vehicle lower structure is applied, as viewed from the vehicle front side and the vehicle width direction outer side and the vehicle upper side. (A) is the expanded sectional view which cut the vehicle lower part structure shown by FIG. 2 by CC line, (B) is an expanded sectional view corresponding to (A) after collision load is input. (A) is a diagram showing a relationship between a stroke of a joint portion generated by a collision load and a shear force acting on the joint portion in the vehicle lower structure, and (B) is a stroke of the joint portion and a load acting on the joint portion (C) is a figure which shows the absorbed energy amount of the collision load in the said vehicle substructure. (A) is a cross-sectional view corresponding to FIG. 1 (B) of the vehicle lower structure according to the second embodiment, (B) is a vehicle lower structure according to a first modification of the second embodiment (B) FIG. 7C is a cross-sectional view corresponding to FIG. 1B of the vehicle lower structure according to the second modification of the second embodiment.

  Hereinafter, the vehicle lower part structure which concerns on embodiment of this invention is demonstrated using FIGS. 1-8. Here, in the figure, the arrow FR shown appropriately indicates the forward direction of the vehicle to which the vehicle lower structure according to the embodiment is applied, the arrow IN indicates the inner side in the vehicle width direction, and the arrow UP indicates the vehicle upper side Indicates the direction.

First Embodiment
A vehicle lower structure according to a first embodiment of the present invention will be described using FIGS. 1 to 7. First, the structure of the vehicle to which the vehicle lower structure is applied will be briefly described.

(Configuration of vehicle)
As shown in FIG. 5, the vehicle substructure 10 according to the present embodiment is applied to a vehicle 12, here a car. The vehicle 12 includes a vehicle front portion 14 on which a power unit or the like is mounted, a vehicle compartment 16 on which an occupant gets in, and a vehicle rear portion 18 having a luggage space or the like. A pair of left and right rockers 20 serving as framework members is extended from the vehicle front portion 14 to the vehicle rear portion 18 at the vehicle lower side of both end portions in the vehicle width direction with the vehicle longitudinal direction as the longitudinal direction. Similarly, a pair of left and right roof side rails 22 as frame members are extended from the vehicle front portion 14 to the vehicle rear portion 18 on the vehicle upper side of both end portions in the vehicle width direction with the vehicle longitudinal direction as the longitudinal direction.
Here, since the configuration of each of the left side portion and the right side portion of the vehicle 12 is substantially the same as that of the left-right symmetrical configuration, the configuration of the left side portion will be described in the following description. The description of the configuration on the right side is omitted.

  Between the rocker 20 and the roof side rail 22 from the vehicle front side to the vehicle rear side, a front pillar (A pillar) 24 as a framework member, a center pillar (B pillar) 26, and a rear pillar (C pillar) 28 Of each are arranged sequentially. One end of the front pillar 24 is connected to the front end of the rocker 20, and the other end of the front pillar 24 extends upward from the vehicle, and extends halfway from the middle to the rear of the vehicle from the middle to the roof side It is connected to the front end of the rail 22. One end of the center pillar 26 is connected to the middle of the rocker 20, and the other end of the center pillar 26 extends upward from the vehicle and is connected to the middle of the roof side rail 22. One end of the rear pillar 28 is connected to the rear end of the rocker 20, and the other end of the rear pillar 28 extends upward from the vehicle and is connected to the rear end of the roof side rail 22.

  An area surrounded by the rocker 20, the roof side rail 22, the front pillar 24 and the center pillar 26 is a door opening 30 of a front side door (not shown). Further, a region surrounded by outlines by the rocker 20, the roof side rail 22, the center pillar 26, and the rear pillar 28 is a door opening 32 of a rear side door, which is not shown.

(Structure of the vehicle substructure)
As shown in FIGS. 1 to 4, the vehicle lower structure 10 includes the front end of the rocker 20, the lower end of the front pillar 24, and the reinforcing member 40 (see FIGS. 1, 2 and 4). There is.

The rocker 20 is configured to include a rocker panel 202 and a rocker outer panel 204.
As shown in FIG. 1 (A), FIG. 1 (B) and FIG. 3, the rocker panel 202 includes a side wall 202A, a top wall 202B, a bottom wall 202C, and an upper flange (first upper flange). ) 202D and a lower flange (first lower flange) 202E. The side wall portion 202A is formed of a plate-like member having a thickness direction in the vehicle width direction and a longitudinal direction in the vehicle front-rear direction. The top wall portion 202B is formed by bending the upper end portion of the side wall portion 202A outward in the vehicle width direction. The bottom wall portion 202C is formed by bending the lower end portion of the side wall portion 202A outward in the vehicle width direction. Side wall portion 202A, top wall portion 202B and bottom wall portion 202C project inward in the vehicle width direction as viewed from the front of the vehicle, and are formed in a trapezoidal shape whose outer side in the vehicle width direction is open. The upper flange 202D is formed by bending the upper end of the top wall portion 202B from the outer side in the vehicle width direction to the upper side of the vehicle. The lower flange 202E is formed by being bent downward from the outer end of the bottom wall portion 202C in the vehicle width direction. That is, the side wall portion 202A, the top wall portion 202B, the bottom wall portion 202C, the upper flange 202D, and the lower flange 202E are integrally formed, and the rocker panel 202 is formed in a hat shape projecting inward in the vehicle width direction in a front view of the vehicle. ing.

  On the other hand, the rocker outer panel 204 is disposed outside the rocker panel 202 in the vehicle width direction. The rocker outer panel 204 includes a side wall portion 204A, a top wall portion 204B, a bottom wall portion 204C, an upper flange (second upper flange) 204D, and a lower flange (second lower flange) 204E. Side wall portion 204A is formed of a plate-like member having a thickness direction in the vehicle width direction and a longitudinal direction in the vehicle front-rear direction. The top wall portion 204B is formed by bending the upper end portion of the side wall portion 204A inward in the vehicle width direction. The bottom wall portion 204C is formed by bending the lower end portion of the side wall portion 204A inward in the vehicle width direction. Side wall section 204A, top wall section 204B and bottom wall section 204C project outward in the vehicle width direction as viewed from the front of the vehicle, and are formed in a trapezoidal shape whose inside in the vehicle width direction is open. The upper flange 204D is formed by being bent upward from the vehicle width direction inner end of the top wall portion 204B. The lower flange 204E is formed by being bent downward from the vehicle width direction inner end of the bottom wall portion 204C. That is, the side wall portion 204A, the top wall portion 204B, the bottom wall portion 204C, the upper flange 204D, and the lower flange 204E are integrally formed, and the rocker outer panel 204 is formed in a hat shape projecting outward in the vehicle width direction in the vehicle front view There is.

The upper flange 202D of the rocker panel 202 is joined to the upper flange 204D of the rocker outer panel 204, and the lower flange 202E is joined to the lower flange 204E. When the rocker panel 202 and the rocker outer panel 204 are joined and the two openings are connected, a closed cross section 206 is formed in the rocker 24 as shown in FIGS. 1 (A) and 1 (B).
Here, the Rockinna panel 202 and the rocker outer panel 204 are both formed of steel plates. In the present embodiment, a high tensile steel plate having a tensile strength of 980 MPa or more is used.
Spot welding is used for joining. The joint portion is a portion that is marked with an “x” in the drawing and marked with a symbol W. Moreover, laser welding can be used for joining.

As shown in FIGS. 1 to 4, the front pillar 24 includes a front pillar inner panel 242 and a front pillar outer panel 244.
The lower end portion 242A on the vehicle lower side of the front pillar inner panel 242 is formed of a plate-like member whose thickness direction is in the vehicle width direction. Although the detailed description is omitted in particular, the upper side of the vehicle than the lower end portion 242A of the front pillar inner panel 242 is formed in a hat shape projecting inward in the vehicle width direction in a plan view of the vehicle. The lower end portion 242A is slightly extended toward the rear side of the vehicle, and the shape of the front pillar inner panel 242 including the lower end portion 242A in a side view of the vehicle is formed in an L shape.
The lower end portion 242A is sandwiched and joined between the upper flange 202D of the rocker panel 202 and the upper flange 204D of the rocker outer panel 204, as shown in FIGS. 1 (A) and 1 (B). Furthermore, the lower end portion 242A is sandwiched and joined between the lower flange 202E and the lower flange 204E. That is, the lower end portion 242A is extended in the closed cross section 206 of the rocker 20.

  An opening 242B penetrating in the thickness direction in the lower end portion 242A between the joint by the upper flange 202D and the upper flange 204D and the joint by the lower flange 202E and the lower flange 204E, that is, in the closed cross section 206 of the rocker 20 Is provided. The shape and the number are not particularly limited, but the opening 242B is formed in a rectangular shape whose longitudinal direction is the vertical direction of the vehicle in a side view of the vehicle, and two openings are spaced apart in the longitudinal direction of the vehicle. The lower end portion 242A is slightly extended toward the vehicle rear side, so that the plurality of openings 242B can be easily arranged.

On the other hand, as shown in FIGS. 1 to 4, the front pillar outer panel 244 is disposed with the rocker outer panel 204 interposed outside the front pillar inner panel 242 in the vehicle width direction. A lower end portion 244A on the vehicle lower side of the front pillar outer panel 244 is formed of a plate-like member whose thickness direction is in the vehicle width direction. The front pillar outer panel 244 is formed in a hat shape that protrudes outward in the vehicle width direction in plan view from the lower end portion 244A toward the upper side of the vehicle. The lower end portion 244A is slightly extended toward the vehicle rear side similarly to the lower end portion 242A of the front pillar inner panel 242, and the shape of the front pillar outer panel 244 including the lower end portion 244A in the vehicle side view is formed in an L shape. .
Although illustration of a junction etc. is omitted, the flange portion of the front pillar outer panel 244 is overlapped with the flange portion of the front pillar inner panel 242, and the flanges are joined at the overlapped portion. Spot welding is used here for joining.
The front pillar inner panel 242 and the front pillar outer panel 244 are both made of, for example, the same material as the rocker 20.

  As shown in FIGS. 1 (A), 1 (B) and 3, in the closed cross section 206 of the rocker 20, a reinforcing member 40 as a rocker implant is disposed. Describing in detail, the reinforcing member 40 is configured to include a side wall portion 402, a top wall portion 404, and a projecting portion 406.

  The side wall portion 402 is formed of a plate-like member having a thickness direction in the vehicle width direction and a longitudinal direction in the vehicle front-rear direction. For example, a steel plate is used as the plate-like member. The side wall portion 402 is extended from the connection portion between the rocker 20 and the front pillar 24 over the rear pillar 28 (see FIG. 5). As shown in FIGS. 1A and 1B, the side wall portion 402 is joined to the side wall portion 202A of the rocker panel 202. Here, the bonding points W are two in the vertical direction of the vehicle.

  The top wall portion 404 is formed by bending the upper end portion of the side wall portion 402 outward in the vehicle width direction, as shown in FIGS. 1 (A), 1 (B) and 3. The top wall portion 404 is formed along the top wall portion 202B of the rocker panel 202 (the upper portion of the locker panel 202), and is joined to the inner wall of the top wall portion 202B. Although it is not limited to this number, in the ceiling wall part 404, it is considered as one bonding point W.

As shown in FIG. 1A, FIG. 1B and FIG. 3, the projecting portion 406 is located at the position corresponding to the opening 242B of the front pillar inner panel 242 from the top wall portion 404 outside in the vehicle width direction. It is partially provided to The projecting portion 406 has a thickness direction in the vertical direction of the vehicle, and is a plate-like member formed in a rectangular shape in a plan view of the vehicle. Further, in the present embodiment, two projecting portions 406 are provided spaced apart in the vehicle longitudinal direction, and each projecting portion 406 passes through the opening portion 242B and the ceiling wall portion 202B of the rocker outer panel 204 ( It extends along the top of the rocker outer panel 204).
Here, the projecting portion 406 may be integrally formed with the ceiling wall portion 404 as schematically shown in FIGS. 1A and 1B, or as shown in detail in FIG. As shown, the side wall portion 402 and the top wall portion 404 may be formed as separate members. When it is formed as a separate member, the vehicle width direction inner side end of the protruding portion 406 is bent toward the vehicle lower side to form a flange, and the protruding portion 406 is formed in an L shape in a front view of the vehicle. The flange of the projecting portion 406 is joined to the side wall portion 402. For example, spot welding is used for joining.
Furthermore, at least the vehicle rear side end of the projecting portion 406 is separated from the inner wall on the vehicle rear side of the opening 242B with an appropriate clearance. By setting the clearance, the projecting portion 406 can be smoothly passed through the opening 242B. The clearance may not be substantially set.

The projecting portion 406 is joined to the inner wall of the top wall portion 204B of the rocker outer panel 204 via an adhesive 42. The adhesive 42 is applied at least between the projecting portion 406 and the top wall portion 204B, and here, with the longitudinal direction of the vehicle as the longitudinal direction, the entire area of the lower end portion 242A of the front pillar inner panel 242 is rectangular in plan view It is applied in the form (see Figure 4). Furthermore, a part of the adhesive 42 is also applied between the upper flange 202D of the rocker panel 202 and the upper flange 204D of the rocker outer panel 204, contributing to the adhesion of both.
As the adhesive 42, it is possible to practically use, for example, a structural adhesive having elasticity as compared with a plate-like member (for example, a steel plate) forming the rocker 20. For example, a structural adhesive containing an epoxy resin as a main component can be used as the structural adhesive, and when this structural adhesive is used, high bond strength and high durability of the joint can be obtained. Can.
In addition, for bonding using the adhesive 42, weld bonding using spot welding in combination can be employed.

(Operation and effect of the present embodiment)
As shown in FIGS. 1 to 4, the vehicle lower structure 10 according to the present embodiment includes a rocker panel 202 and a rocker outer panel 204 constituting the rocker 20 and a front pillar inner panel 242 constituting the front pillar 24. Equipped with
The rocker panel 202 has an upper flange 202D (first upper flange) at the upper end of the vehicle and a lower flange 202E (first lower flange) at the lower end of the vehicle. It is formed in the shape of a projecting hat. The rocker outer panel 204 has an upper flange 204D (second upper flange) joined to the upper flange 202D at the vehicle upper end and a lower flange 204E (second lower flange) joined to the lower flange 202E at the vehicle lower end. Have. The rocker outer panel 204 is formed in a hat shape projecting outward in the vehicle width direction when the vehicle is viewed from the front.
Then, as shown in FIGS. 1A and 1B, the rocker outer panel 204 forms a rocker 20 having a rocker panel 202 and a closed cross section 206. A lower end portion 242A having a thickness direction in the vehicle width direction is provided on the vehicle lower side of the front pillar inner panel 242.

Here, in the vehicle lower structure 10, as shown in FIGS. 1A and 1B, the lower end portion 242A of the front pillar inner panel 242 is sandwiched between the upper flange 202D and the upper flange 204D. It is joined in the state. Particularly, as shown in FIG. 3, the lower end portion 202 </ b> A is provided with an opening 242 </ b> B penetrating in the thickness direction in the closed cross section 206.
The vehicle lower structure 10 is provided with a reinforcing member 40 disposed in the closed cross section 206 of the rocker 20. The top wall portion 404 as one end portion of the reinforcing member 40 is joined to the top wall portion 202 B of the rocker panel 202. The projecting portion 406 as the other end of the reinforcing member 40 is joined to the top wall portion 204B of the rocker outer panel 204 through the opening 242B of the lower end portion 242A of the front pillar inner panel 242.

  In the vehicle 12 shown in FIG. 5, for example, when a small lap collision (small overlap collision) occurs on the left side of the vehicle front portion 14, a collision load F is input as shown in FIGS. . The collision load F is localized near the upper portion of the side wall portion 204A of the rocker outer panel 204 and the top wall portion 204B surrounded by a broken line with reference symbol E in FIG. 1A via the front tire 50 on the left side. Is input to The collision load F can be dispersed to the rocker panel 202 through the reinforcing member 40 and further to the lower end portion 242A of the front pillar inner panel 242 (and the front pillar outer panel 244).

As described in detail with reference to FIG. 1A, the collision load F is transmitted from the rocker outer panel 204 to the projecting portion 406 of the reinforcing member 40 and dispersed to the top wall portion 404 and the side wall portion 402 of the reinforcing member 40. . In addition, the collision load F is transmitted from the top wall portion 404 and the side wall portion 402 to the rocker panel 202 and dispersed in the rocker panel 202. Furthermore, when the protruding portion 406 of the reinforcing member 40 moves toward the vehicle rear relative to the front pillar inner panel 242 and contacts the inner wall of the opening 242B of the lower end portion 242A, the collision load F is projected It is distributed to the front pillar inner panel 242 through the portion 406.
For this reason, as shown in FIG. 6A, in the rocker 20, the moving amount of the rocker outer panel 204 to the vehicle rear side with respect to the rocker panel 202 becomes smaller, and the joint W between the upper flange 202D and the upper flange 204D. The stress acting on the In particular, with respect to the area in which the joint W is disposed with a predetermined interval L1 in the vehicle longitudinal direction, the area in which the joint W is disposed with an interval L2 larger than the interval L1 due to the restriction of the shape and structure In the above, it is possible to effectively suppress or prevent breakage of the joint W due to the collision load F. Further, in this region, the opening between the upper flange 202D and the upper flange 204D due to the collision load F can be effectively suppressed or prevented. As a result, in the vehicle lower structure 10, the bonding strength between the rocker inner panel 202 and the rocker outer panel 204 can be improved.

Further, in the vehicle lower structure 10 according to the present embodiment, as shown in FIGS. 1A and 1B, the ceiling wall portion 204B of the rocker outer panel 204 and the projecting portion 406 of the reinforcing member 40 are provided. An adhesive 42 is used for bonding. The adhesive 42 is more elastic than the rocker outer panel 204 and the reinforcing member 40, respectively.
Here, as shown in FIG. 6B, when the collision load F is input, the upper flange 204D of the rocker outer panel 204 moves to the vehicle rear side with respect to the upper flange 202D of the rocker panel 202, and adhesion is performed. The agent 42 is deformed. As a result, the energy of the collision load F is absorbed by the adhesive 42, so the bonding strength between the rocker panel 202 and the rocker outer panel 204 can be further improved.

FIG. 7A is a graph showing the relationship between the stroke and the shear force in the vehicle lower structure 10 according to the present embodiment and the vehicle lower structure according to the comparative example. The horizontal axis indicates the moving stroke of the collision barrier from the front side to the rear side of the vehicle, and the vertical axis indicates the shearing force (in units of [kN]) acting on the joint W. The shear force for the stroke of the vehicle undercarriage according to the comparative example is shown by a thin broken line, and the shear force for the stroke of the vehicle undercarriage 10 according to the present embodiment is shown by a thick solid line (shown in FIG. 7B). The same applies to the
As shown in FIG. 7A, in the vehicle lower structure 10 according to the present embodiment, the shear force at the joint W is reduced to half or less compared to the vehicle lower structure according to the comparative example.

FIG. 7B is a graph showing the relationship between the stroke and the load in the vehicle lower structure 10 according to the present embodiment and the vehicle lower structure according to the comparative example. The horizontal axis shows the moving stroke, and the vertical axis shows the collision load (in [kN]) acting on the rocker.
As shown in FIG. 7B, the initial peak load was increased by 10% to 20% in the vehicle lower structure 10 according to the present embodiment, as compared to the vehicle lower structure according to the comparative example.

FIG. 7C is a graph showing the relationship between the absorbed energy amount in the vehicle lower structure 10 according to the present embodiment and the vehicle lower structure according to the comparative example. The vertical axis represents the amount of absorbed energy (unit is [kJ]).
As shown in FIG. 7C, in the vehicle lower structure 10 according to the present embodiment, the absorbed energy amount is increased by 30% to 40% as compared with the vehicle lower structure according to the comparative example.

Second Embodiment
A vehicle lower structure 10 according to a second embodiment will be described with reference to FIGS. 8 (A) to 8 (C). In the present embodiment, the same components as or the components substantially the same as those of the vehicle lower structure 10 according to the first embodiment are designated by the same reference numerals, and the redundant description will be omitted.

  As shown in FIG. 8A, in the vehicle lower structure 10 according to the present embodiment, the configuration of the reinforcing member 40 is different from the configuration of the reinforcing member 40 of the vehicle lower structure 10 according to the first embodiment. It is different. The configuration other than the reinforcing member 40 of the vehicle lower structure 10 according to the present embodiment is the same as the configuration of the vehicle lower structure 10 according to the first embodiment.

  Describing in detail, the reinforcing member 40 includes the top wall portion 404 or a part thereof, and the projecting portion 406, and does not include the side wall portion 402 (see FIG. 1B). When only a portion of the top wall portion 404 is provided, a portion of the top wall portion 404 is disposed at a position corresponding to the lower end portion 242A of the front pillar inner panel 242. Regarding the method of joining the ceiling wall portion 404 and the ceiling wall portion 202B of the rocker panel 202, and the method of joining the projecting portion 406 and the ceiling wall portion 204B of the rocker outer panel 204, the vehicle lower structure 10 according to the first embodiment. Is the same as the bonding method in

  In the vehicle lower structure 10 configured as described above, when, for example, a collision load F (see FIGS. 2 and 4) is input to the rocker outer panel 204 when a micro lap collision occurs, the collision load F is a reinforcing member 40. Can be dispersed in the rocker panel 202. Furthermore, the collision load F can be dispersed to the front pillar inner panel 242 (and the front pillar outer panel 244) through the reinforcing member 40 and the lower end portion 242A. Therefore, the bonding strength between the rocker panel 202 and the rocker outer panel 204 can be improved as in the case of the operation and effect obtained by the vehicle lower structure 10 according to the first embodiment.

(First modification)
The vehicle lower structure 10 shown in FIG. 8B is a first modification of the vehicle lower structure 10 according to the first embodiment. In the vehicle lower structure 10, the filler 210 is provided in the closed cross section 206 of the rocker 20, and the foam 212 is provided between the filler 210 and at least the projecting portion 406 of the reinforcing member 40 in the closed cross section 206. It is done.

The filler 210 is disposed at a position corresponding to at least the projecting portion 406 so as to reduce a gap between the filling member 210 and the projecting portion 406. For example, a resin base material is used as the filler 210.
The foam material 212 causes volume expansion due to foaming, starting from the upper surface portion of the filler material 210. The projecting portion 406 can be pushed upward of the vehicle by utilizing this volume expansion. That is, the filler 210 and the foam material 212 push up the projecting portion 406 toward the vehicle upper side, and press the projecting portion 406 on the top wall portion 204B of the rocker outer panel 204.

  In the vehicle lower structure 10 configured as described above, since the filler 210 and the foam material 212 are provided in the closed cross section 206 of the rocker 20, the projecting portion 406 of the reinforcing member 40 and the top wall portion 204B of the rocker outer panel 204 The adhesion of can be further enhanced. Therefore, the same function and effect as the function and effect obtained by the vehicle lower structure 10 according to the first embodiment can be obtained, and the bonding strength between the rocker panel 202 and the rocker outer panel 204 can be further improved.

(2nd modification)
A vehicle lower structure 10 shown in FIG. 8C is a second modification of the vehicle lower structure 10 according to the first embodiment. In the vehicle lower structure 10, the configuration of the reinforcing member 40 disposed in the closed cross section 206 of the rocker 20 is the same as the configuration of the reinforcing member 40 of the vehicle lower structure 10 according to the first embodiment. It has an opposite shape. That is, the side wall portion 402 of the reinforcing member 40 is joined to the side wall portion 204 A of the rocker outer panel 204, and the top wall portion 404 is joined to the top wall portion 204 B of the rocker outer panel 204.
The projecting portion 406 of the reinforcing member 40 is a rocker panel 202 through the opening 242B (see FIG. 1A, FIG. 1B and FIG. 3) of the front pillar inner panel 242 (not shown in FIG. 8C). It protrudes to the side and is joined to the ceiling wall portion 202B. An adhesive 42 is interposed between the projecting portion 404 and the top wall portion 202B, similarly to the vehicle lower structure 10 according to the first embodiment.

  In the vehicle lower structure 10 configured as described above, the same effects as those obtained by the vehicle lower structure 10 according to the first embodiment can be obtained.

[Supplementary explanation of the above embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.
For example, in the present invention, the filler and foam material of the vehicle lower structure shown in FIG. 8 (B), the vehicle lower structure shown in FIG. 8 (A), or the vehicle lower structure shown in FIG. It can be applied to

10 Vehicle substructure 20 Rocker 202 Rockinna panel 202D upper flange (first upper flange)
202E lower flange (first lower flange)
204 Rocker outer panel 204D upper flange (second upper flange)
204E lower flange (second lower flange)
206 closed cross section 24 front pillar 242 front pillar inner panel 242A lower end 242B opening 40 reinforcing member 404 top wall 406 projecting portion

Claims (1)

A hat-shaped locker panel having a first upper flange at the upper end of the vehicle and a first lower flange at the lower end of the vehicle, and projecting inward in the vehicle width direction as seen from the front of the vehicle;
The vehicle upper side end has a second upper flange joined to the first upper flange, and a vehicle lower side end has a second lower flange joined to the first lower flange. A rocker outer panel which is formed in a hat shape projecting outward and which forms a rocker of a closed cross section with the rocker panel;
The lower end portion on the lower side of the vehicle is joined in a state where it is sandwiched between the first upper flange and the second upper flange with the vehicle width direction as a thickness direction, and the lower end portion has a thickness in the closed cross section A front pillar inner panel having an opening extending in the longitudinal direction;
A reinforcing member disposed in the closed cross section, having one end joined to the top of the rocker panel and the other end joined to the top of the rocker outer panel through the opening;
Vehicle substructure with.