JP2013119311A - Floor structure of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a floor structure of a vehicle body that can enhance versatility of parts for a floor cross member.SOLUTION: In the state that an inner end of a bracket 22 in a width direction of a vehicle is arranged in a middle part of a floor cross panel 20 in the width direction of the vehicle, the bracket 22 is joined to the floor cross panel 20. Consequently, a substantially rectangular closed cross section in side view of the vehicle is formed between the floor cross panel 20 and the bracket 22, and a vulnerable part 28 is formed at the position of an inner end of the bracket 22 of the floor cross member 18 in the width direction of the vehicle.

Description

  The present invention relates to a floor structure of a vehicle body.

  Conventionally, when a weak part is provided on a floor cross member and the vehicle body receives a collision load due to a side collision, the floor cross member is deformed starting from the weak part, so that the center pillar enters the cabin. A floor structure of a vehicle body that suppresses this is known. For example, Patent Document 1 below discloses a structure in which a first floor cross member and a second floor cross member are fitted between a rocker and a tunnel, and a weak portion is provided at the position of the fitting portion. Has been.

JP 2010-120404 A

  However, in the conventional structure, in order to set the position of the weak part of the floor cross member for each vehicle body having different vehicle types and specifications, the first floor cross member and the second floor cross member are set for each vehicle body. Had to be set to As a result, the conventional structure has room for improvement in terms of the versatility of the parts constituting the floor cross member.

  In view of the above facts, an object of the present invention is to obtain a floor structure of a vehicle body that can enhance the versatility of components constituting a floor cross member.

  The floor structure of the vehicle body according to the first aspect of the present invention is a floor cross member that is disposed on the floor panel on the inner side in the vehicle width direction of the rocker and extends in the vehicle width direction by being joined to the floor panel. A first member that forms a portion and an overlap with the first member, one end portion is joined to the rocker and the other end portion is joined to an intermediate portion of the first member, And a second member that forms a part of the second member.

  In this invention of Claim 1, a part of floor cross member extended in a vehicle width direction is formed on this floor panel by joining a 1st member to a floor panel. In addition, one end portion of the second member superimposed on the first member is joined to the rocker, and the other end portion is joined to an intermediate portion of the first member, so that the first member and the first member Another part of the floor cross member is formed between the two members. As a result, the rigidity of the portion of the floor cross member where the second member is joined is higher than the stiffness of the portion where the second member is not joined. In other words, at the boundary between the portion of the floor cross member where the second member is joined and the portion where the second member is not joined (the position of the inner end of the second member in the vehicle width direction). The rigidity of the floor cross member changes greatly (a difference in cross-sectional yield strength occurs). As a result, when a collision load due to a side collision is applied to the vehicle body, the stress applied to the floor cross member is caused between the portion where the second member of the floor cross member is joined and the portion where the second member is not joined. It concentrates on the boundary (the position of the inner end of the second member in the vehicle width direction). That is, a fragile portion is formed in a portion where the stress is concentrated. Thus, a weak part is formed on a floor cross member by joining the other end part of the 2nd member to the middle part of the 1st member. In other words, the fragile portion is formed on the floor cross member by changing only the configuration of the second member without changing the configuration of the first member.

  A vehicle body floor structure according to a second aspect of the present invention is the vehicle body floor structure according to the first aspect, wherein the second member is provided on each of the left and right sides in the vehicle width direction, and the vehicle of the second member. The end portions on the outer side in the width direction are respectively joined to the rockers having different heights on the left and right sides.

  According to the second aspect of the present invention, the fragile portion is provided with the floor cross member by changing the structure of the first member forming the floor cross member without changing the configuration of the second member according to the height of the left and right rockers. Formed on top.

  According to a third aspect of the present invention, there is provided a vehicle body floor structure according to the first or second aspect of the present invention, wherein the other member is provided between the first member and the second member. The fastening member which fastens to the floor of the vehicle body is provided so as to be slidable in the vehicle front-rear direction.

  According to the third aspect of the present invention, the fastening member having the above-described configuration is provided. Therefore, when the first member is joined to the floor of the vehicle body, even if the position of the first member in the vehicle front-rear direction varies, this variation is caused by the fastening member sliding in the vehicle front-rear direction. Absorbed.

  The floor structure of the vehicle body according to the first and second aspects of the present invention has an excellent effect that the versatility of parts constituting the floor cross member can be enhanced.

  The floor structure of the vehicle body according to the third aspect of the present invention has an excellent effect that the cost for managing the assembly tolerance of the first member or the like can be reduced.

(A) is a top view which shows the floor structure of the vehicle body which concerns on 1st Embodiment, (B) is sectional drawing along the 1B-1B line | wire in (A). (A) And (B) is sectional drawing of the vehicle rear view which shows the floor structure of the vehicle body which concerns on a 1st modification. It is sectional drawing of the vehicle rear view which shows the floor structure of the vehicle body which concerns on a 2nd modification. (A) is sectional drawing of the vehicle rear view which shows the floor structure of the vehicle body which concerns on 2nd Embodiment, (B) is an expansion perspective view which shows a fastening member.

<First Embodiment>
A vehicle body floor structure according to a first embodiment of the present invention will be described with reference to FIG. The front side in the vehicle front-rear direction is indicated by an arrow FR, the outer side in the vehicle width direction is indicated by an arrow OUT, and the upper side in the vehicle vertical direction is indicated by an arrow UP. Moreover, in the following description, when using the front and rear direction and the up and down direction, unless otherwise specified, the front and rear direction of the vehicle and the up and down direction of the vehicle are shown.

  As shown in FIGS. 1A and 1B, the floor structure 10 of the vehicle body of the present embodiment extends in the vehicle front-rear direction and the vehicle width direction, and forms a floor surface of the cabin 12. And a rocker 16 that is provided at the outer end of the floor panel 14 in the vehicle width direction and extends in the vehicle front-rear direction. The vehicle floor structure 10 also includes a floor cross panel 20 and a bracket 22 that form a floor cross member 18 extending in the vehicle width direction. Hereinafter, the floor panel 14 will be described first, and then the rocker 16, the floor cross panel 20, and the bracket 22 will be described.

(Floor panel 14)
The floor panel 14 is a large press-molded part that extends in the vehicle longitudinal direction and the vehicle width direction. In addition, a tunnel (not shown) formed so as to protrude toward the vehicle upper side is formed along the vehicle front-rear direction at an intermediate portion of the floor panel 14 in the vehicle width direction. An exhaust pipe or the like is provided below the tunnel. Furthermore, the joint part 14A formed so that it may bend in the vehicle upper side is formed in the both ends of the vehicle width direction outer side of the floor panel 14. As shown in FIG.

(Rocker 16)
The rocker 16 is a skeleton member of a vehicle body that is disposed outside the floor panel 14 in the vehicle width direction and extends in the vehicle front-rear direction. Specifically, the rocker outer panel 24 and the rocker inner panel 26 having a hat-shaped cross section are joined to each other via a flange portion 24A and a flange portion 26A. By joining the rocker outer panel 24 and the rocker inner panel 26, a substantially rectangular closed cross section is formed in the vehicle rear view. In addition, an end face on the inner side in the vehicle width direction of the rocker 16 (an end face on the inner side in the vehicle width direction of the rocker inner panel 26) is joined to the joint portion 14A of the floor panel 14.

(Floor cross panel 20)
The floor cross panel 20 as the first member is a press-molded part that extends in the vehicle width direction and is provided between the tunnel formed in the floor panel 14 and the rocker 16. Specifically, the floor cross panel 20 has a hat-shaped cross section that opens to the vehicle lower side in a side view of the vehicle, and includes an upper wall portion 20A that extends substantially parallel to the floor panel 14. In addition, the floor cross panel 20 includes an inclined wall portion 20B extending so as to incline toward the vehicle lower side from the end of the upper wall portion 20A on the inner side in the vehicle width direction. Further, the inclined wall portion 20B is formed with a fixing portion 20C formed so as to protrude upward of the vehicle. The fixing portion 20C is formed with a fixing hole 20D that opens in the vehicle vertical direction. A nut (not shown) disposed on the axis concentric with the fixing hole 20D is welded to the fixing hole 20D. ing. A bolt (not shown) is inserted into a fixing hole 20D formed in the fixing portion 20C, whereby a seat rail (not shown) is attached to the fixing portion 20C. Furthermore, the floor cross panel 20 includes an inner wall portion 20E extending from the end of the inclined wall portion 20B on the inner side in the vehicle width direction to the vehicle lower side. Further, the floor cross panel 20 includes a front wall portion 20F extending from the vehicle front side end portion of the upper wall portion 20A and the inclined wall portion 20B to the vehicle lower side, and a vehicle rear side of the upper wall portion 20A and the inclined wall portion 20B. A rear wall portion 20G extending from the side end to the vehicle lower side. Further, the floor cross panel 20 is a flange that extends from the ends of the inner wall portion 20E, the front wall portion 20F, and the rear wall portion 20G on the vehicle lower side side by bending to the vehicle width direction inner side, the vehicle front side, and the rear side, respectively. Part 20H. The flange portion 20H is superimposed on the floor panel 14 and joined by welding. Thus, by joining the floor cross panel 20 to the floor panel 14, a substantially rectangular closed cross section is formed between the floor cross panel 20 and the floor panel 14 in a vehicle side view. As a result, the floor cross panel 20 and the floor panel 14 form a part of the floor cross member 18 extending in the vehicle width direction. In the state where the floor cross panel 20 is joined to the floor panel 14, the end of the floor cross panel 20 on the outer side in the vehicle width direction and the rocker 16 are separated from each other.

(Bracket 22)
The bracket 22 as the second member is a press-molded part that extends in the vehicle width direction and is provided above the floor cross panel 20. Specifically, the bracket 22 has a hat-shaped cross section that opens to the vehicle lower side when viewed from the side of the vehicle, and extends so as to incline toward the vehicle lower side from the outer end in the vehicle width direction toward the inner side. An inclined wall portion 22A is provided. The inclined wall portion 22A is formed with a fixing portion 22B formed so as to protrude upward of the vehicle, similarly to the fixing portion 20C formed on the floor cross panel 20. The fixing portion 22B is formed with a fixing hole 22C that opens in the vehicle vertical direction. A nut (not shown) arranged on the axis concentric with the fixing hole 22C is welded to the fixing hole 22C. ing. A seat rail (not shown) is attached to the fixing portion 22B by inserting a bolt (not shown) into the fixing hole 22C formed in the fixing portion 22B. Further, the bracket 22 extends from the end on the vehicle front side of the inclined wall portion 22A to the vehicle lower side, and extends from the end on the vehicle rear side of the inclined wall portion 22A to the vehicle lower side. And a rear wall portion 22E. In addition, the bracket 22 is a joint that extends from the ends of the inclined wall portion 22A, the front wall portion 22D, and the rear wall portion 22E in the vehicle width direction outside by bending to the vehicle width direction outer side, the vehicle front side, and the rear side, respectively. A portion 22F is provided. The joint 22F is joined to the rocker inner panel 26 of the rocker 16. That is, the floor cross panel 20 is joined to the rocker 16 via the bracket 22.

  Furthermore, in the state where the end portion on the inner side in the vehicle width direction of the bracket 22 is disposed in the intermediate portion in the vehicle width direction on the floor cross panel 20, the lower end portions of the front wall portion 22D and the rear wall portion 22E of the bracket 22 are The floor cross panel 20 is joined to the front wall portion 20F and the rear wall portion 20G by welding. As a result, a substantially rectangular closed cross section is formed between the floor cross panel 20 and the bracket 22 in a side view of the vehicle. In other words, another part of the floor cross member 18 is formed by the floor cross panel 20 and the bracket 22.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  As shown in FIGS. 1A and 1B, in the vehicle body floor structure 10 of the present embodiment, the end portion on the inner side in the vehicle width direction of the bracket 22 is arranged at the intermediate portion in the vehicle width direction on the floor cross panel 20. In this state, the bracket 22 is joined to the floor cross panel 20. Then, a closed cross section is formed between the floor cross panel 20 and the bracket 22. As a result, the rigidity of the portion of the floor cross member 18 where the bracket 22 is joined is higher than the rigidity of the portion where the bracket 22 is not joined. In other words, the floor cross member 18 at the boundary between the portion of the floor cross member 18 where the bracket 22 is joined and the portion where the bracket 22 is not joined (the position of the end of the bracket 22 in the vehicle width direction). The rigidity of the material changes greatly. As a result, when a collision load due to a side collision is applied to the vehicle body, the stress applied to the floor cross member 18 is a boundary between the portion of the floor cross member 18 where the bracket 22 is joined and the portion where the bracket 22 is not joined ( It concentrates on the position of the inner end of the bracket 22 in the vehicle width direction. That is, the portion where the stress is concentrated becomes the fragile portion 28. Thus, the weak part 28 is formed on the floor cross member 18 by setting the position of the end part of the bracket 22 on the inner side in the vehicle width direction to the middle part of the floor cross panel 20 in the vehicle width direction. In other words, the weakened portion 28 is formed on the floor cross member 18 by changing only the configuration of the bracket 22 without changing the configuration of the floor cross panel 20. That is, in this embodiment, the versatility of the floor cross panel 20 constituting the floor cross member 18 can be enhanced.

<First Modification>
Next, a vehicle body floor structure according to a first modification of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the member same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 2A shows a cross-sectional view of the floor of the vehicle body on the right side as viewed from the rear of the vehicle with respect to the tunnel formed in the floor panel 14. FIG. 2B shows a cross-sectional view of the floor of the left vehicle body as viewed from the rear of the vehicle with respect to the tunnel formed on the floor panel 14. As shown in these drawings, the floor structure 30 of the vehicle body according to this modification is provided with floor cross panels 20 on the left and right sides of the tunnel formed on the floor panel 14, and the left and right floors. The ends of the first bracket 32 and the second bracket 34 which are joined to the cross panel 20 on the outer side in the vehicle width direction are joined to the rocker 36 and the rocker 38 having different left and right heights (heights with respect to the floor panel 14). It is characterized by being.

  As shown in FIG. 2 (A), the outer end of the first bracket 32 as the second member in the vehicle width direction is joined to a rocker 36 having a height from the floor panel 14 of h1. That is, the front wall portion 22D and the rear wall portion 22E of the first bracket 32 are set according to the height h1 of the rocker 36.

  As shown in FIG. 2B, the end of the second bracket 34 as the second member on the outer side in the vehicle width direction is joined to a rocker 38 whose height from the floor panel 14 is h2. That is, the front wall portion 22D and the rear wall portion 22E of the second bracket 34 are set according to the height h2 of the rocker 38.

(Operation and effect of this modification)
Next, the operation and effect of this embodiment will be described.

  In the floor structure 30 of the vehicle body of the present embodiment, the first bracket 32 and the first bracket 32 that match the heights h1 and h2 of the left and right rockers 36 and 38 without changing the configuration of the floor cross panel 20 that forms the floor cross member 18. By providing the two brackets 34, the weakened portion 28 is formed on the floor cross member 18. That is, in this embodiment, the versatility of the floor cross panel 20 constituting the floor cross member 18 can be enhanced.

<Second Modification>
Next, a vehicle body floor structure according to a second modification of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the member same as 1st Embodiment etc., and the description is abbreviate | omitted.

  As shown in FIG. 3, in the floor structure 40 of the vehicle body according to this modification, the height h3 from the floor panel 14 of the fixing portion 42A formed on the upper portion of the bracket 42 is higher than the height h2 of the rocker 38. It is characterized by being set high. A seat rail and a seat (not shown) are attached to the fixing portion 42A.

(Operation and effect of this modification)
Next, the operation and effect of this embodiment will be described.

  In the vehicle body floor structure 40 according to this modification, the height h3 of the fixing portion 42A formed on the upper portion of the bracket 42 from the floor panel 14 is set to be higher than the height h2 of the rocker 38. Therefore, for example, the hip point of the occupant seated on the seat can be set at a higher position while diverting seat rails and seats of other vehicle types. That is, in this modification, the diversion property of the seat rail and the seat can be improved.

Second Embodiment
A vehicle body floor structure according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the member same as 1st Embodiment etc., and the description is abbreviate | omitted.

  As shown in FIG. 4A, the vehicle body floor structure 46 according to the present embodiment has a fastening member 48 for fastening a seat rail (not shown) to the floor of the vehicle body between the floor cross panel 20 and the bracket 52. It is characterized in that it is provided. Hereinafter, the fastening member 48 will be described first, and then the structure between the floor cross panel 20 on which the fastening member 48 is provided and the bracket 52 will be described.

  As shown in FIG. 4B, the fastening member 48 is configured by welding a square weld nut 48A to the bottom surface of a rectangular flat base 48B. Specifically, an insertion hole 48C opened in the vehicle vertical direction is formed in the base portion 48B, and a square weld nut 48A disposed on the axis concentric with the insertion hole 48C is formed below the insertion hole 48C. Welded.

  As shown in FIG. 4A, a substantially U-shaped guide groove 50 extending in the vehicle front-rear direction is formed in the upper wall portion 20A of the floor cross panel 20 so as to be recessed. In addition, a long hole (not shown) whose longitudinal direction is the vehicle front-rear direction is formed in the fixing portion 52B formed in the upper wall portion 52A of the bracket 52. Further, after the fastening member 48 is fitted in the guide groove 50, the bracket 52 is joined to the floor cross panel 20 from the upper part of the floor cross panel 20 and the fastening member 48. In this state, the fastening member 48 can slide along the guide groove 50 in the vehicle front-rear direction.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, when the seat rail is fixed to the fixing portion 52B of the bracket 52, a bolt (not shown) is inserted into the seat rail, and then this bolt is formed in the elongated hole formed in the fixing portion 52B and the fastening member 48. It is inserted through the insertion hole 48C. The bolt is screwed into the square weld nut 48A, so that the seat rail is fixed to the fixing portion 52B.

  Here, in this embodiment, the fastening member 48 can slide in the vehicle front-rear direction. Therefore, even when the floor cross panel 20 is joined to the floor panel 14, even if the position of the floor cross panel 20 in the vehicle front-rear direction varies, this variation is caused by the fastening member 48 sliding in the vehicle front-rear direction. Is absorbed. That is, in this embodiment, the cost for managing the assembly tolerance of the vehicle body member such as the floor cross panel 20 can be reduced.

  In the present embodiment, the example in which the fastening member 48 is configured by welding the square weld nut 48A to the bottom surface of the base portion 48B has been described. However, this invention is not limited to this, For example, you may comprise a fastening member by providing a stud bolt etc. in the base 48B.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

10 Car body floor structure
14 Floor panel
18 Floor cross member
20 Floor cross panel (first member)
22 Bracket (second member)
28 Vulnerable parts
30 Car body floor structure
32 First bracket (second member)
34 Second bracket (second member)
40 Car body floor structure
42 Bracket (second member)
46 Car body floor structure
48 Fastening member

Claims (3)

A first member which is disposed on the floor panel on the inside of the rocker in the vehicle width direction and forms a part of a floor cross member extending in the vehicle width direction by being joined to the floor panel;
A second member that overlaps with the first member, has one end joined to the rocker and the other end joined to a midway portion of the first member to form another part of the floor cross member When,
The floor structure of the car body with   2. The vehicle body according to claim 1, wherein the second member is provided on each of the left and right sides in the vehicle width direction, and ends of the second member on the outer side in the vehicle width direction are respectively joined to the rockers having different heights on the left and right sides. Floor structure.   The fastening member for fastening another member to the floor of the vehicle body is provided between the first member and the second member so as to be slidable in the vehicle front-rear direction. The floor structure of the car body.

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