JP6384257B2 - Vehicle floor structure - Google Patents

Description

  The present invention relates to a vehicle floor structure having a reinforcing member that suppresses the sinking of the vehicle floor during a frontal collision.

  When a vehicle collides forward, the energy of the collision is absorbed by deforming a part of the frame of the vehicle body or transmitting an impact load to the frame and dispersing it.

  According to the automobile floor structure described in Patent Document 1, in the event of an offset frontal collision, the floor tunnel and the floor cross member are coupled to suppress load concentration on the collision side and the anti-collision side of the floor panel. A patch is attached as a reinforcing plate in an area that is 45 degrees outward and rearward in the vehicle width direction starting from the section. The patch is formed from the region of the floor panel to the inclined portion of the floor panel that is inclined so as to rise toward the rear side of the vehicle body.

  By the way, the load received by the floor panel due to the frontal collision is not only the collisional load transmitted from the front via the front side member, but also the inertial force that acts on the seat fixed on the floor panel and the weight of the occupant seated on this seat. It is necessary to consider the resulting load. Since the occupant seated in the seat is wearing the seat belt, a load in a direction of pushing down the front side of the seat is applied to the floor panel of the seat fixing portion by the forward collision. When the floor panel is pushed down, it gives the occupant the feeling of being thrown forward.

  According to the vehicle floor structure described in Patent Document 2, a vehicle floor structure in which a seat cross member that extends in the width direction of the passenger compartment and that attaches a rear seat is fixed to the upper surface of the floor panel. A reinforcing member extending to the end in the vehicle width direction is fixed to the longitudinal member (side sill) and the lower surface side of the floor panel. And the force which pushes down a seat cross member at the time of a frontal collision is transmitted to a longitudinal member by a reinforcement member, and a deformation | transformation of a floor panel is suppressed.

JP 2014-136544 A JP 2004-322767 A

  In Patent Document 2, a sheet cross member is fixed as a separate member on the upper surface of a flat floor panel, and a reinforcing member is fixed as a separate member on the lower surface. However, when a reinforcing member is newly provided in order to suppress the floor panel from sinking, the reinforcing member cannot be joined at a desired position in relation to the joining location of other reinforcing members, or there is an existing reinforcing member. For this reason, it is often necessary to consider adding reinforcing members, such as changing the joint location of other members or changing the assembly order, such as it is difficult to secure a load transmission path, and review the surrounding structure. Need arises.

  Therefore, the present invention provides a vehicle floor structure that can reduce subsidence caused by a forward collision by adding a reinforcing member without greatly changing an existing reinforcing member.

  A vehicle floor structure according to an embodiment of the present invention includes a tunnel portion, a front floor, a kick-up portion, a rear floor, a side sill, a side floor, a kick-up lateral portion, a corner reinforcing member, and a lower bracket. A tunnel part is arrange | positioned in the center along the advancing direction of a vehicle. The front floor extends to both sides of the tunnel. The kick-up portion is formed continuously at the tunnel portion and the rear end of the front floor. The rear floor extends backward from the kick-up section. The upper side edge of the side sill is joined to the outer edge of the front floor along the traveling direction of the vehicle. The side floor extends along the front floor so as to wrap around the outside of the kick-up portion. The kick-up lateral portion is formed continuously from the side floor to the rear floor. The corner reinforcing member goes from the front floor and the kick-up portion to the side floor and the kick-up lateral portion and is joined to the upper surface side. The lower bracket is joined to the lower surface of the front floor where the corner reinforcing member is located from the side sill in the vehicle width direction.

  At this time, the corner reinforcing member and the lower bracket are spot-welded at least at one place on a three-layer stack sandwiching the front floor and the side floor.

  It is also preferable to further include an upper reinforcing member. The upper reinforcing member is joined to the upper surface in the range from the rear end of the front floor to the front end of the rear floor, in the vicinity of the portion connected to the kick-up portion from the rear end of the tunnel portion.

  According to the vehicle floor structure of the present invention, the corner reinforcing member is joined to the upper surface and the lower bracket is joined to the lower surface with respect to the side floor extending from the front floor so as to go around both sides of the kick-up portion. Accordingly, it is possible to prevent the both ends of the kick-up portion and the kick-up lateral portion from bending and sinking with respect to the front floor and the side floor. At this time, according to the vehicle floor structure of the invention in which the corner reinforcing member and the lower bracket are spot-welded in a three-layered manner sandwiching the front floor and the side floor, the corner reinforcing member and the lower bracket are directly joined. The rigidity increases with respect to the load acting in the direction of pushing down the front floor and the side floor.

  Further, according to the vehicle floor structure of the invention further including the upper reinforcing member, the upper reinforcing member is provided on the upper surface in the vicinity of the portion connected to the kick-up portion from the rear end of the tunnel portion and from the rear end of the front floor to the front end of the rear floor. Are joined. Since the kick-up portion is divided into left and right at the portion connected to the tunnel portion, the portion where the tunnel portion is joined to the kick-up portion is strengthened by attaching the upper reinforcing member. Thereby, it can suppress that the front floor near a tunnel part sinks.

The perspective view which shows the vehicle floor of 1st Embodiment which concerns on this invention. The perspective view which expanded the rear end side of the tunnel part of the vehicle floor structure of FIG. The perspective view of the corner part periphery which expanded F3 part in FIG. Sectional drawing of a corner part periphery which follows the F4-F4 line | wire in FIG. The top view of the vehicle floor structure of FIG. Sectional drawing of the vehicle floor structure which follows F6-F6 line | wire in FIG. Sectional drawing of the vehicle floor structure which follows F7-F7 line | wire in FIG.

  A floor panel 1 having a vehicle floor structure according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an entire floor panel 1 having a vehicle floor structure. A floor panel 1 shown in FIG. 1 has a tunnel portion 2 arranged along the traveling direction of a vehicle, and a front floor 3 continuously extends on both sides thereof. The floor panel 1 is provided with a kick-up portion 5 between the front floor 3 on which the front seat is installed and the rear floor 4 on which the rear seat is installed so that the rear floor 4 side is one step higher. The floor panel 1 has a structure that is difficult to be deformed even when it receives a force that pushes down the kick-up portion 5 with an inertial force that acts on the rear seat and the occupant seated therein during a frontal collision.

  For this purpose, the floor panel 1 shown in FIG. 1 includes a tunnel portion 2, a front floor 3, a kick-up portion 5, a rear floor 4, a side sill 31, a side floor 34, a kick-up lateral portion 55, a corner reinforcing member 11, and a lower bracket 12. Is provided. For convenience of the embodiment, “front” and “rear” based on the traveling direction of the vehicle, “right” and “left” as viewed from the occupant riding the vehicle, and “up” and “lower” based on gravity, respectively. Define. Also, “inside” and “outside” are defined in the vehicle width direction.

  As shown in FIG. 1, the tunnel part 2 is arrange | positioned in the center along the advancing direction of a vehicle. The front floor 3 continues to the lower edges on both the left and right sides of the tunnel portion 2 and extends on both sides. FIG. 2 is a perspective view generally showing the periphery of the kick-up portion 5. The kick-up portion 5 is formed continuously from the rear end of the tunnel portion 2 and the front floor 3, and has a front wall 51 that rises from the rear end of the front floor 3 to the height of the upper portion 21 of the tunnel portion 2. Yes. The rear floor 4 extends rearward from the kick-up portion 5.

  Further, as shown in FIGS. 1 and 2, the side sill 31 is disposed outside the left and right front floors 3 along the traveling direction of the vehicle, and the upper edge of each side sill 31 is joined to the outer edge of the front floor 3. Is done. In the floor panel 1 having the vehicle floor structure of the present embodiment, the side floor 34 extends along the front floor 3 so as to wrap around both outsides of the kick-up portion 5. The kick-up lateral portion 55 is formed by a side wall 54 that continues from the side floor 3 to the rear floor. A portion connected from the kick-up portion 5 to the kick-up lateral portion 55 and a portion connected from the front floor 3 to the side floor 34 are collectively referred to as a corner portion 50.

  As shown in FIGS. 1 and 2, the corner reinforcing member 11 and the lower bracket 12 are attached so as to reinforce the corner portion 50. FIG. 3 is an enlarged perspective view of the periphery of the corner portion 50. As shown in FIG. 3, the corner reinforcing member 11 is formed so as to go from the front wall 51 of the front floor 3 and the kick-up portion 5 to the side floor 34 and the side wall 54 of the kick-up lateral portion 55. Joined to the upper surface of the floor 34, the front surface of the front wall 51, and the outer surface of the side wall 54.

  Further, the side sill 31 extends to the outside of the side floor 34 as shown in FIGS. As shown in FIGS. 3 and 4, the lower bracket 12 extends from the side sill 31 toward the lower surface side of the front floor 3 where the corner reinforcing member 11 is positioned in the vehicle width direction, and is joined thereto. FIG. 4 is a cross-sectional view of the lower bracket 12 and its surroundings along the vehicle width direction. The lower bracket 12 extends in a direction along the front wall 51 of the kick-up portion 5 and is attached so as to support the corner portion 50 from below. As shown in FIGS. 3 and 4, the portion where the corner reinforcing member 34 and the lower bracket 12 overlap is spot-welded in three layers with the front floor 3 and the side floor 34 interposed therebetween.

  As a result, the corner reinforcing member 11 and the lower bracket 12 are directly joined, so that the load is directly transmitted between the corner reinforcing member 11 and the lower bracket 12. Further, the front wall 51 of the kick-up portion 5 is indirectly connected to the side sill 31 via the lower bracket 12. Therefore, the load applied to the kick-up portion 5 is transmitted to the side sill 31, and the load applied to the side sill 31 is transmitted to the opposite side sill 31 via the kick-up portion 5. Further, the load applied to the rear floor 4 is transmitted from the corner portion 50 to the side sills 31 by the corner reinforcing member 11 and the lower bracket 12. At this time, since the side sill 31 has sufficient rigidity, it can suppress that the corner part 50 and the rear floor 4 sink.

  In each figure, the part spot-welded to three sheets is indicated by T, and the part spot-welded to two sheets is indicated by W. In FIG. 4, the side member 9 is shown immediately below the joint portion (three-layer overlap spot welded portion T) between the corner reinforcing member 11 and the lower bracket 12.

  Furthermore, the floor panel 1 having the vehicle floor structure of the present embodiment includes an upper reinforcing member 7 as shown in FIGS. 1, 2, and 5. FIG. 5 is a plan view of a range from the front floor 3 to the kick-up portion 5 and the vicinity thereof. The upper reinforcing member 7 is joined to the vicinity of the portion connected to the kick-up portion 5 from the rear end of the tunnel portion 2 and to the upper surface in the range from the rear end of the front floor 3 to the front end 41 of the rear floor 4. Specifically, the upper portion 21 and the side wall 22 of the tunnel portion 2, the front floor 3 located on both sides of the rear end of the tunnel portion 2 and connected to the kick-up portion 5, and the front wall 51 of the kick-up portion 5 on both sides of the tunnel portion 2. And the upper reinforcement member 7 is formed in the shape along the shape of the range of the front end 41 of the rear floor 4, and is spot-welded and fixed to each. The front wall 51 of the kick-up part 5 is divided into left and right by the provision of the tunnel part 2. By providing the upper reinforcing member 7, it becomes easy to transmit the load acting on the front wall 51 of the kick-up portion 5 to the opposite side in the vehicle width direction.

  The vehicle floor structure of the present embodiment further includes a lower reinforcing member 6 as shown in FIGS. FIG. 6 is a cross-sectional view across the tunnel portion in front of the upper reinforcing member 7 in the vehicle width direction, and FIG. 7 is a cross-sectional view along the center of the tunnel portion 2 in the traveling direction of the vehicle. As shown in FIG. 6, the lower reinforcing member 6 is provided in a range extending from the tunnel portion 2 to the front floor 3, that is, on the inner side end of the front floor 3 continuously extending from the left and right side walls 22 of the tunnel portion 2 and the lower end thereof. It is joined to the lower surface of the range. Further, as shown in FIG. 7, the kick-up portion 5 has a rear cross member 53 joined to the rear with the reinforcing member 52 interposed therebetween.

  As shown in FIG. 5, the lower reinforcing members 6 are arranged in a pair of left and right, but are so-called “V-shaped” that approach each other in the vehicle width direction toward the kick-up portion 5. Yes. The rear end 61 of the lower reinforcing member 6 extends to a position overlapping the front end 71 of the upper reinforcing member 7. The rear end 61 of the lower reinforcing member 6 is spot-welded in three layers with the front floor 3 sandwiched between the front end 71 of the upper reinforcing member 7 that overlaps the front floor 3. The rear end 61 of the lower reinforcing member 6 may extend to the vicinity of the kick-up portion 5. The lower reinforcing members 6 arranged in a pair are connected to each other via the upper reinforcing member 7.

  Furthermore, the floor panel 1 having the vehicle floor structure of this embodiment has a tunnel reinforcing member 8 in the upper portion 21 of the tunnel portion 2. The tunnel reinforcing member 8 covers the upper portion 21 of the tunnel portion 2 up to a position overlapping the upper edge 62 of the lower reinforcing member 6 extending along the inside of the tunnel portion 2. In this tunnel reinforcing member 8, the outer edge portions 81 along the traveling direction of the vehicle are spot-welded in three layers with the side wall 22 of the tunnel portion 2 sandwiched from the upper edge 62 of the lower reinforcing member 6. Is done.

  According to the vehicle floor structure configured as described above, when the vehicle collides forward, the load caused by the mass of the rear seat installed on the rear floor 4 and the occupant seated there is applied to the rear floor 4. In addition, it acts in a direction to push the kick-up portion 5 downward. At this time, the corner reinforcing member 11 and the lower bracket 12 are joined to the corner portions 50 at the left and right ends of the kick-up portion 5. Since the kick-up portion 5 is formed continuously from the front floor 3, the load concentrates on the bent portion. However, since the corner reinforcing member 11 is joined to the corner portion 50, the load is dispersed throughout the corner portion 50. The lower bracket 12 is joined to the opposite side of the corner reinforcing member 11 with the front floor 3 and the corner floor 34 interposed therebetween, and supports the load dispersed by the corner reinforcing member 11. As a result, it is possible to prevent the floor panel 1 from being deformed so that the rear floor 4 and the kick-up portion 5 sink.

  Moreover, since the floor panel 1 has the upper reinforcement member 7 joined to the center of the kick-up part 5 connected to the rear end of the tunnel part 2, the floor panel 1 in the vicinity of the tunnel part 2 may sink. Can be suppressed. Further, a pair of lower reinforcing members 6 are provided in a range connecting the side wall 22 of the tunnel portion 2 to the front floor 3, and the rear end 61 of the lower reinforcing member 6 is connected to the front end 71 of the upper reinforcing member 7 with the front floor 3 and the tunnel portion. Since the three side walls 22 are spot-welded in three layers, the collision load transmitted through the lower reinforcing member 6 is directly transmitted to the upper reinforcing member 7 and acts to push up the kick-up portion 5. Therefore, the sinking of the floor panel 1 can be further reduced.

  The floor panel 1 having the vehicle floor structure according to the embodiment of the present invention has been described above. In the present embodiment, by having the corner reinforcing member 11 and the lower bracket 12, the floor panel 1 has sufficient rigidity to receive the load in the sinking direction that acts on the corner portion 50 of the kick-up portion 5 at the time of a forward collision. Can have. Further, the upper reinforcing member 7, the lower reinforcing member 6, and the tunnel reinforcing member 8 further enhance the effect obtained by providing the corner reinforcing member 11 and the lower bracket 12. The addition of reinforcing members other than these does not change the essence of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Floor panel (with vehicle floor structure), 2 ... Tunnel part, 3 ... Front floor, 31 ... Side sill, 34 ... Side floor, 4 ... Rear floor, 41 ... Front end, 5 ... Kick-up part, 51 ... Front wall , 54 ... side wall, 55 ... kick-up lateral part, 7 ... upper reinforcing member, 11 ... corner reinforcing member, 12 ... lower bracket, T ... spot welded in three layers.

Claims (3)

A tunnel portion arranged in the center along the traveling direction of the vehicle,
A front floor extending to both sides of the tunnel,
A kick-up portion formed continuously at a rear end of the tunnel portion and the front floor;
A rear floor extending rearward from the kick-up portion;
A side sill whose upper edge is joined to the outer edge of the front floor along the traveling direction of the vehicle;
A side floor extending along the front floor so as to wrap around the outside of the kick-up portion,
A kick-up lateral portion formed continuously from the side floor to the rear floor;
A corner reinforcing member joined from the front floor and the kick-up portion to the side floor and the kick-up lateral portion and joined to the upper surface side;
A lower bracket joined to the lower surface side of the front floor where the corner reinforcing member is positioned from the side sill in the vehicle width direction;
A vehicle floor structure comprising: 2. The vehicle floor structure according to claim 1, wherein the corner reinforcing member and the lower bracket are spot-welded in at least one place on a three-layer stack sandwiching the front floor and the side floor. The upper reinforcement member joined to the upper surface of the range from the rear end of the front floor to the front end of the rear floor near the portion connected to the kick-up portion from the rear end of the tunnel portion. The vehicle floor structure according to claim 1 or claim 2.

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