JP5131169B2 - Floor end joint structure - Google Patents

Description

  The present invention relates to a center floor disposed on a rear side member and a floor end joint structure for joining a rear floor and a wheel house inner.

In the following Patent Document 1, a rear side member disposed along the vehicle front-rear direction and a rear wheel house inner disposed on the outer side in the vehicle width direction include a vehicle width direction end portion of the center floor and a vehicle width direction end portion of the rear floor. A structure in which is welded is disclosed. In this structure, the vehicle width direction end portion of the center floor is disposed on the rear side member, and the vehicle width direction end portion of the rear floor joined to the vehicle rear side of the center floor is disposed on the rear side member. The rear end portion of the vehicle on the center floor on the member and the front end portion of the vehicle on the rear floor do not have welding points.
JP 2003-212152 A

  However, in the case of the above prior art, the center floor and the rear floor on the rear side member do not have welding hit points, so that the center floor and the rear floor are deformed independently from each other due to input from the suspension when traveling on a rough road, There is a possibility that stress concentrates on the welding point with the rear wheel house inner.

  In view of the above facts, the present invention obtains a floor end joint structure that suppresses deformation of the center floor and the rear floor and can suppress stress concentration at the welding spot between the center floor and the rear wheel house inner. Is the purpose.

  The floor end joint structure according to the invention of claim 1 is arranged with the vehicle longitudinal direction as the longitudinal direction, the cross-sectional shape along the vehicle width direction is formed in a hat shape, and the opening is arranged upward of the vehicle. The rear side member is disposed along the vehicle width direction, and the vehicle width direction end portion is disposed on the rear side member so as to be joined to both ends of the rear side member in the vehicle width direction, and on the rear side member. A center floor in which a bead is formed in a direction intersecting with the longitudinal direction of the rear side member at a rear end portion of the vehicle, and a vehicle front end portion of the center floor is disposed on the vehicle rear side of the center floor along the vehicle width direction. While being joined to the vehicle rear end portion, the vehicle width direction end portion is disposed on the rear side member, and the vehicle width direction both end portions of the rear side member and And a rear floor in which the vehicle front end portion is not welded to the vehicle rear end portion of the center floor at the vehicle width direction intermediate portion on the rear side member, and extends along the vehicle front-rear direction. And a rear wheel house inner joined to the vehicle width direction end of the center floor and the vehicle width direction end of the rear floor.

  According to a second aspect of the present invention, in the floor end joint structure according to the first aspect, the bead is formed in a direction orthogonal to the longitudinal direction of the rear side member.

  According to a third aspect of the present invention, in the floor end joint structure according to the first or second aspect, the bead includes a vehicle width direction outer side end portion of the center floor on the rear side member, and a vehicle on the center floor. It is formed straddling between the rear end portion and the welding spot on the outer side in the vehicle width direction of the vehicle front end portion of the rear floor.

  According to the first aspect of the present invention, the rear side member is formed in a hat shape in cross section along the vehicle width direction, and the opening of the rear side member is arranged upward of the vehicle. A center floor is arranged along the vehicle width direction, an end of the center floor in the vehicle width direction is arranged on the rear side member, joined to both ends of the rear side member in the vehicle width direction, and on the rear side member of the center floor. A bead is formed at the rear end of the vehicle in a direction crossing the longitudinal direction of the rear side member. In addition, a rear floor is disposed along the vehicle width direction on the vehicle rear side of the center floor, the vehicle front end portion of the rear floor is joined to the vehicle rear end portion of the center floor, and the vehicle width direction end portion of the rear floor is on the rear side member. The vehicle front end portion of the rear floor is not welded to the vehicle rear end portion of the center floor at the vehicle width direction intermediate portion on the rear side member. Furthermore, the rear wheel house inner is extended along the vehicle front-back direction, and the rear wheel house inner is joined to the vehicle width direction end part of the center floor and the vehicle width direction end part of the rear floor. By providing a bead that intersects the longitudinal direction of the rear side member on the rear side member on the rear side member of the center floor, deformation of the vehicle rear end portion of the center floor due to input from the suspension or the like when traveling on a rough road is suppressed. The As a result, it is possible to avoid stress concentration on the welding spot between the center floor and the rear wheel house inner.

  According to the second aspect of the present invention, the beads are arranged in a direction perpendicular to the longitudinal direction of the rear side member, and deformation of the rear end portion of the vehicle on the center floor is further suppressed. For this reason, it can further avoid that stress concentrates on the joint hitting point of a center floor and a rear wheel house inner.

  According to the third aspect of the present invention, the bead is welded on the rear side member on the outer side in the vehicle width direction of the center floor, on the outer side in the vehicle width direction on the rear end of the vehicle on the center floor and on the front end on the rear floor. Between the two. Accordingly, it is possible to increase the distance between the outer end of the bead in the vehicle width direction, the outer end of the center floor in the vehicle width direction, and the welding hit point at the outer end of the rear side member in the vehicle width direction. For this reason, when the center floor is pulled inward in the vehicle width direction, the change in angle at the outer end of the center floor in the vehicle width direction can be reduced.

  As described above, the floor end joint structure according to the first aspect of the present invention has an excellent effect that stress can be prevented from concentrating on the joining point between the center floor and the rear wheel house inner. .

  The floor end joint structure according to the second aspect of the present invention has an excellent effect that stress can be further prevented from being concentrated at the joint hitting point between the center floor and the rear wheel house inner.

  In the floor end joint structure according to the third aspect of the present invention, when the center floor is pulled inward in the vehicle width direction, the angle change at the outer end portion in the vehicle width direction of the center floor can be reduced. It has an excellent effect.

  [First Embodiment]

  Hereinafter, a first embodiment of a floor end joint structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 1 is a perspective view of a vehicle to which the floor end joint structure of the present invention is applied. FIG. 2 is an exploded perspective view of a vehicle to which the floor end joint structure of the present invention is applied. It is shown. As shown in these drawings, a center floor 12 is disposed in the lower portion of the body of the vehicle 10 along the vehicle width direction and the vehicle front-rear direction. The center floor 12 has a substantially L-shaped cross section along the vehicle front-rear direction, and the vehicle front end 12A is bent toward the vehicle lower side. A rear floor 14 is disposed along the vehicle width direction and the vehicle front-rear direction on the rear side of the center floor 12 in the vehicle front-rear direction, and the vehicle rear end portion 12B of the center floor 12 is the rear floor 14 at the middle in the vehicle width direction. It arrange | positions on the vehicle front-end part 14A, and is joined by spot welding.

  As shown in FIGS. 2, 4 and 5, rear side members 16 are disposed on both sides of the vehicle 10 along the vehicle front-rear direction. The rear side member 16 has a hat-like cross section along the vehicle width direction, and the opening 16A is arranged toward the upper part of the vehicle. An end portion 12 </ b> C in the vehicle width direction of the center floor 12 is disposed on the rear side member 16. Further, a flange portion 12 </ b> D that is bent toward the vehicle upper side with respect to the general surface of the center floor 12 is formed at the vehicle rear side edge portion of the vehicle width direction end portion 12 </ b> C of the center floor 12.

  An end 14 </ b> B in the vehicle width direction of the rear floor 14 is disposed on the rear side member 16. An end 16B on the inner side in the vehicle width direction of the rear side member 16 is bent substantially horizontally along the vehicle front-rear direction. The end 16B of the rear side member 16, the end 12C in the vehicle width direction of the center floor 12, and the rear floor 14 The vehicle width direction end portion 14B is joined by spot welding.

  An end 16C on the outer side in the vehicle width direction of the rear side member 16 is disposed along the vehicle vertical direction. A flange portion 14C that is bent toward the vehicle upper side is formed on the outer side in the vehicle width direction of the rear floor 14, and the flange portion 14C, the end portion 16C of the rear side member 16, and the side wall portion 18A of the rear wheel house inner 18 are overlapped. In this state, the flange portion 14C and the end portion 16C of the rear side member 16, and the end portion 16C of the rear side member 16 and the side wall portion 18A of the rear wheel house inner 18 are joined by spot welding.

  A flange portion 12D that is bent toward the vehicle upper side is formed at the vehicle width direction outer side of the vehicle rear end portion of the center floor 12, and the flange portion 12D, the end portion 16C of the rear side member 16, and the rear wheel house inner 18 are In a state where the side wall portion 18A is overlapped, the flange portion 12D and the end portion 16C of the rear side member 16, and the end portion 16C of the rear side member 16 and the side wall portion 18A of the rear wheel house inner 18 are joined by spot welding. .

  Further, the vehicle rear end 12E of the center floor 12 disposed on the rear side member 16 and the vehicle front end 14D of the rear floor 14 are not welded. The vehicle rear end portion 12E of the center floor 12 and the vehicle front end portion 14D of the rear floor 14 arranged on the rear side member 16 are generally not welded from the viewpoint of an increase in manufacturing cost and manufacturing efficiency.

  A concave bead 20 that is substantially orthogonal to the longitudinal direction of the rear side member 16 is formed at the vehicle rear end portion on the rear side member 16 at the vehicle width direction end portion 12C of the center floor 12. The bead 20 has a flange 12D of the center floor 12, a vehicle rear end 12E of the center floor 12, and a vehicle front end 14D of the rear floor 14 in the vehicle width direction above a portion where the opening 16A of the rear side member 16 is formed. It is formed so as to straddle between the outermost welding point 30. In other words, as shown in FIG. 3, the bead 20 is between the welding hit point 30 between the vehicle rear end portion 12B of the center floor 12 and the vehicle front end portion 14D of the rear floor 14 and the flange portion 12D of the center floor 12. The outer end portion of the bead 20 in the vehicle width direction is abutted against the flange portion 12D.

  The bead 20 is the most severe of the welding spot portions 32 of the flange portion 12D of the center floor 12 and the end portion 16C of the rear side member 16 and the end portion 16C of the rear side member 16 and the side wall portion 18A of the rear wheel house inner 18 (the separation is not required). It is preferable to be provided directly below the welding spot. This makes it possible to suppress stress concentration on the most severe welding spot. In addition, when there are 2 or 3 severe welding points, it is preferable to use 2 or 3 beads.

  Furthermore, from the ridgeline 13 between the vehicle width direction outer side end portion of the bead 20 formed on the center floor 12 and the flange portion 12D, the flange portion 12D of the center floor 12, the end portion 16C of the rear side member 16, and the rear wheel house inner 18 are formed. It is preferable to increase the distance from the side wall 18 </ b> A to the welding spot 32 (higher the height from the ridge 13 to the welding spot 32). For example, this distance can be set to about 3 mm. By increasing this distance, it is possible to suppress the change in angle between the general surface of the center floor 12 and the flange portion 12D when the center floor 12 is pulled inward in the vehicle width direction.

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

  A bead 20 is provided at a rear end portion of the vehicle on the rear side member 16 on the center floor 12 in a direction substantially orthogonal to the longitudinal direction of the rear side member 16, and the center floor 12 due to input from a suspension during rough road driving or the like. Deformation of the rear end of the vehicle can be suppressed, and deformation such as fluttering of the center floor 12 on the rear side member 16 can be suppressed. Thereby, it can suppress that stress concentrates on the welding hit point part 32 of flange part 12D of the center floor 12, and side wall part 18A of the rear wheel house inner 18. As shown in FIG.

  Further, as shown in FIG. 5 and the like, the ridge line 13 between the vehicle width direction outer side end of the bead 20 formed on the center floor 12 and the flange portion 12D, the end of the flange portion 12D of the center floor 12 and the rear side member 16 The distance between the portion 16 </ b> C (the side wall portion 18 </ b> A of the rear wheel house inner 18) and the welding hit point portion 32 can be increased by the height of the bead 20. For this reason, when the center floor 12 is pulled inward in the vehicle width direction, the angle change between the general surface of the center floor 12 and the flange portion 12D can be reduced. That is, as shown in FIG. 6, in a structure in which a bead is not provided at the vehicle rear end portion on the rear side member 16 of the center floor 102, the general surface of the center floor 102, the ridge line of the flange portion 102 </ b> D, When the center floor 102 is pulled inward in the vehicle width direction because the distance between the portion 102D and the welding hit point portion of the side wall portion 18A of the rear wheel house inner 18 cannot be increased, the general surface of the center floor 102 And the angle change between the flange portion 12D becomes large.

  On the other hand, in the present embodiment, the distance between the bead 20 of the center floor 12 and the ridge line 13 of the flange portion 12D, and the flange portion 12D of the center floor 12 and the welding spot portion 32 of the side wall portion 18A of the rear wheel house inner 18 Therefore, the strength near the flange portion 12D of the center floor 12 is increased, and the change in the angle between the general surface of the center floor 12 and the flange portion 12D can be mitigated. The bead 20 is formed so as to pass through the flange portion 12D of the center floor 12, the vicinity of the welding spot portion 32 of the side wall portion 18A of the rear wheel house inner 18, and the flange portion 12D of the center floor 12. The distance between the ridgeline 13 of the floor 12 and the welding hit point 32 of the flange 12D of the center floor 12 can be increased, and the change in the angle of the flange 12D can be more reliably mitigated.

  On the other hand, in the floor end joint structure according to the comparative example, the vehicle rear end of the center floor disposed on the rear side member and the vehicle front end of the rear floor are not welded, and the vehicle rear end on the rear side member of the center floor is not welded. There is no bead in the part. With this structure, there is a possibility that the rear side member may be deformed by cross-sectional deformation due to torsional deformation that occurs in the body due to input from the suspension when traveling on a rough road. Further, the center floor may be deformed such that the center floor flutters in the vehicle vertical direction on the rear side member, and a force in the peeling direction is applied to the weld hitting point portion with the rear wheel house inner, so that a load on strength is easily applied. Also, in many vehicle models, the floor is divided into, for example, a center floor and a rear floor from the viewpoint of manufacturing, and the rear end of the vehicle on the center floor and the front end of the rear floor are deformed independently of each other. It becomes a part that is likely to be overloaded.

  As shown in FIG. 11, a structure is also proposed in which a long plate member 122 is separately provided only on the rear side member 16 extending along the vehicle longitudinal direction. The end 122A of the plate member 122 in the vehicle width direction is joined to the center floor 12 and the rear floor 14 by spot welding, and the flange 122B of the plate member 122 in the vehicle width direction is connected to the end 16C of the rear side member 16 and the rear wheel house. It is joined to the side wall portion 18A of the inner 18 by spot welding. In this structure, the use of the dedicated plate 122 increases the weight and increases the cost.

  In addition, a structure has been proposed in which a sub-assembly process for the center floor 12 and the rear floor 14 is provided, and a welding spot between the vehicle rear end portion of the center floor 12 and the vehicle front end portion of the rear floor 14 is provided on the rear side member 16. However, this structure increases the manufacturing cost due to an increase in the sub-assembly process.

  On the other hand, in this embodiment, since the bead 20 is provided at the rear end of the vehicle on the rear side member 16 in the center floor 12, an increase in weight can be prevented and the manufacturing cost can be reduced.

  [Second Embodiment]

  Hereinafter, the second embodiment of the floor end joint structure according to the present invention will be described with reference to FIGS. 7 and 8. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7 and FIG. 8, a concave bead 42 is formed at the vehicle rear end portion of the center floor 12 disposed on the rear side member 16 of the vehicle 40 in a direction substantially orthogonal to the longitudinal direction of the rear side member 16. Is formed. The bead 42 is formed between the substantially horizontal bottom surface portion 42A formed from the vehicle width direction inner side to the middle portion above the opening 16A of the rear side member 16, and between the vehicle width direction middle portion of the bead 42 and the rising portion of the flange portion 12D. And a tapered surface 52 </ b> B.

  A bead 42 is formed on the center floor 12 at a rear end portion of the vehicle on the rear side member 16 in a direction substantially orthogonal to the longitudinal direction of the rear side member 16, and the center floor 12 receives an input from a suspension when traveling on a rough road. Deformation of the rear end of the vehicle can be suppressed, and deformation such as fluttering of the center floor 12 on the rear side member 16 can be suppressed. As a result, it is possible to avoid stress concentration on the welding point 32 between the flange portion 12D of the center floor 12 and the side wall portion 18A of the rear wheel house inner 18.

  [Third Embodiment]

  Hereinafter, the third embodiment of the floor end joint structure according to the present invention will be described with reference to FIGS. 9 and 10. In addition, about the same component as 1st and 2nd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 9 and 10, the vehicle rear end portion of the center floor 12 disposed on the rear side member 16 provided in the vehicle 50 is convex in a direction substantially orthogonal to the longitudinal direction of the rear side member 16. The bead 52 is formed. The bead 52 is formed between a substantially horizontal plane portion 52A formed from the vehicle width direction inner side to the middle portion above the opening 16A of the rear side member 16, and between the vehicle width direction middle portion of the bead 52 and the rising portion of the flange portion 12D. And a tapered surface 52 </ b> B.

  The center floor 12 is provided with a bead 52 at a rear end portion of the vehicle on the rear side member 16 in a direction substantially orthogonal to the longitudinal direction of the rear side member 16. Deformation of the vehicle rear end portion of the center floor 12 can be suppressed, and deformation such as fluttering of the center floor 12 on the rear side member 16 can be suppressed. As a result, it is possible to avoid stress concentration on the welding point 32 between the flange portion 12D of the center floor 12 and the side wall portion 18A of the rear wheel house inner 18. Further, a convex bead 52 is provided at the vehicle rear end portion of the center floor 12, which is easier to manufacture than the concave bead and the positional accuracy is good.

  [Supplementary explanation of the embodiment]

  The shape and number of beads provided on the center floor are not limited to the first to third embodiments described above, and other configurations may be used. Further, in the first to third embodiments described above, the bead is provided at the vehicle rear end portion on the rear side member in a direction orthogonal to the longitudinal direction of the rear side member. You may provide a bead in the direction which cross | intersects a direction. For example, the angle between the longitudinal direction of the rear side member and the bead can be set to 45 ° to 90 ° as the intersecting direction.

It is a perspective view which shows the whole structure of the floor edge part coupling structure which concerns on 1st Embodiment. It is a disassembled perspective view which shows the floor edge part coupling structure which concerns on 1st Embodiment. It is a perspective view which shows the center floor single-piece | unit used for the floor edge part coupling structure which concerns on 1st Embodiment. It is a perspective view which shows the joining structure of the center floor and rear side member which are used for the floor edge part coupling structure which concerns on 1st Embodiment. It is sectional drawing which shows the joining structure of the center floor and rear side member which are used for the floor edge part coupling structure which concerns on 1st Embodiment. It is a schematic sectional drawing which shows the deformation | transformation state of the floor edge part coupling structure which concerns on 1st Embodiment. It is a perspective view which shows the joining structure of the center floor and rear side member which are used for the floor edge part coupling structure which concerns on 2nd Embodiment. It is sectional drawing which shows the joining structure of the center floor and rear side member used for the floor edge part coupling structure which concerns on 2nd Embodiment. It is a perspective view which shows the joining structure of the center floor and rear side member which are used for the floor edge part coupling structure which concerns on 3rd Embodiment. It is sectional drawing which shows the joining structure of the center floor and rear side member used for the floor edge part coupling structure which concerns on 3rd Embodiment. It is a perspective view which shows the whole structure of the floor edge part coupling structure which concerns on a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 12 Center floor 12B Vehicle rear-end part 12C Vehicle width direction edge part 12D Flange part (vehicle width direction outer side edge part)
14 Rear floor 14A Vehicle front end portion 14B Vehicle width direction end portion 14C Flange portion 16 Rear side member 16B End portion (vehicle width direction both ends)
16C end (both ends in the vehicle width direction)
18 Rear wheel house inner 20 Bead 30 Welding spot (welding spot)
40 Vehicle 42 Bead 50 Vehicle 52 Bead

Claims (3)

A rear side member that is arranged with the vehicle front-rear direction as a longitudinal direction, a cross-sectional shape along the vehicle width direction is formed in a hat shape, and an opening is arranged upward of the vehicle,
It is disposed along the vehicle width direction, and the vehicle width direction end portion is disposed on the rear side member and joined to both ends of the rear side member in the vehicle width direction, and at the vehicle rear end portion on the rear side member. A center floor formed with beads in a direction intersecting with the longitudinal direction of the rear side member;
The vehicle is disposed along the vehicle width direction on the vehicle rear side of the center floor, the vehicle front end portion is joined to the vehicle rear end portion of the center floor, and the vehicle width direction end portion is disposed on the rear side member. A rear floor that is joined to both ends of the rear side member in the vehicle width direction and is configured such that the vehicle front end portion is not welded to the vehicle rear end portion of the center floor at the vehicle width direction intermediate portion on the rear side member;
A rear wheel house inner that extends along the vehicle longitudinal direction and is joined to the vehicle width direction end of the center floor and the vehicle width direction end of the rear floor;
A floor end joint structure having:   The floor end joint structure according to claim 1, wherein the bead is formed in a direction orthogonal to a longitudinal direction of the rear side member.   The bead straddles between a vehicle width direction outer side end portion of the center floor on the rear side member, a vehicle rear end portion of the center floor, and a welding hit point on the vehicle width direction outer side of the vehicle front end portion of the rear floor. The floor end joint structure according to claim 1 or 2, wherein the floor end joint structure is formed.

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