JP5233382B2 - Lower body structure - Google Patents

Description

  The present invention relates to a vehicle body lower structure, and more particularly to a vehicle body lower structure applied to a seat mounting portion of a vehicle such as an automobile.

2. Description of the Related Art Conventionally, a vehicle body lower structure applied to a seat mounting portion of a vehicle such as an automobile is known (Patent Document 1). This car body lower structure has the cushion material of the occupant seat seat directly placed on the bulkhead at the rear of the passenger compartment of the car body, and the end of the skin covering the cushion material is fixed to the bulkhead, corresponding to the recess formed in the bulkhead Protrusions to be formed are formed on the cushion material, and the cushion material is positioned by fitting these irregularities to prevent the cushion material from being displaced and applying an excessive force to the fixing portion of the epidermal terminal. That is, the partition wall is used as a seat frame, and it is not necessary to provide a seat frame on the occupant seating seat itself, and the weight of the occupant seating seat can be reduced to reduce the vehicle weight.
Japanese Patent Laid-Open No. 5-67962

  However, in the above-described conventional technology, a portion (lifting portion) where the thickness of the cushion material is increased in the occupant seating seat corresponding to the low position portion (concave portion) formed in the portion supporting the occupant seating seat. It is necessary to take measures to suppress the sinking of the raised portion of the occupant seating seat that occurs when the occupant is seated. For this reason, the structure of the occupant seat is complicated in the above-described conventional technology.

  In view of the above facts, an object of the present invention is to obtain a vehicle body lower structure that can support an occupant seating seat at a low position of a floor panel without providing a raised portion at the lower portion of the occupant seating seat.

The vehicle body lower part structure of the present invention according to claim 1 is a floor panel in which a low position portion in which a height in the vehicle body vertical direction is lower than a vehicle width direction center portion is formed at an outer end portion in the vehicle width direction, A seat cushion of an occupant seating seat disposed above the floor panel and having an outer side in the vehicle width direction reaching above the low position portion, and fixed to the upper surface of the floor panel at the low position portion of the floor panel. the a seat bracket having a protruding portion that forms a closed-section portion along the longitudinal direction of the vehicle body at the floor panel, have a, when the occupant seated the upper surface of the vehicle width direction central portion seat cushion of the floor panel The lower surface of the center portion in the vehicle width direction is supported from the lower side of the vehicle body, and the upper wall portion of the convex portion of the seat bracket supports the lower surface of the outer end portion in the vehicle width direction of the seat cushion from the lower side of the vehicle body .

Therefore, a closed section along the vehicle body front-rear direction is formed by the convex portion of the seat bracket fixed to the upper surface of the floor panel and the floor panel at the lower position formed at the vehicle width direction outer end of the floor panel. The For this reason, at the time of occupant seating, the upper surface of the vehicle width direction center portion of the floor panel can support the lower surface of the vehicle width direction center portion of the seat cushion of the occupant seating seat from the lower side of the vehicle body, and the occupant seating seat Without providing a raised portion at the lower part of the vehicle, the outer side in the vehicle width direction of the seat cushion of the occupant seat can be supported from the lower side of the vehicle body by the upper wall portion of the convex portion of the seat bracket at the lower position of the floor panel. As a result, since there is no raised portion at the vehicle width direction outer side end portion of the seat cushion, it is necessary to adjust the urethane hardness of the seat cushion, which has been performed to prevent the raised portion from sinking when seated. Absent. In addition, the outer side of the floor panel in the vehicle width direction is formed by the closed cross-sectional portion along the vehicle body longitudinal direction formed by the floor panel and the convex portion of the seat bracket at the low position portion formed at the outer end portion of the floor panel in the vehicle width direction. The part is reinforced.

  According to a second aspect of the present invention, in the vehicle body lower part structure according to the first aspect, an outer end portion in the vehicle width direction of the seat bracket extends along the vehicle body front-rear direction on the outer side in the vehicle width direction of the low position portion of the floor panel. And is fixed to the rocker disposed through the floor panel.

  Accordingly, the outer end portion in the vehicle width direction of the seat bracket is fixed to the rocker disposed along the vehicle longitudinal direction on the outer side in the vehicle width direction of the lower position portion of the floor panel through the floor panel. Folding to the outside in the vehicle width direction or the like at the time of a vehicle rearward collision or the like can be suppressed by a closed cross-sectional portion along the vehicle body front-rear direction formed by the seat bracket and the floor panel.

  According to a third aspect of the present invention, in the vehicle body lower structure according to the second aspect, the vehicle is disposed in the vehicle width direction inner side of the rocker below the seat bracket, and the vehicle body longitudinal direction is formed by the floor panel and the rocker. A side member that forms a closed cross-section along the line is disposed via the floor panel.

  Therefore, the side member disposed via the floor panel below the seat bracket inside the rocker in the width direction of the rocker is formed by the closed cross-sectional portion along the vehicle body longitudinal direction formed by the floor panel and the rocker. The outer part in the direction can be reinforced.

According to a fourth aspect of the present invention, in the vehicle body lower part structure according to the third aspect, a closed cross section formed by the seat bracket and the floor panel, the side member, the floor panel, and the rocker are provided. The closed cross section formed is overlapped in the vertical direction of the vehicle body along each longitudinal direction .

Accordingly, the closed cross section formed by the seat bracket and the floor panel and the closed cross section formed by the side member, the floor panel, and the rocker overlap each other in the vertical direction of the vehicle body along the respective longitudinal directions. The outer side of the panel in the vehicle width direction can be further reinforced.

According to the first aspect of the present invention, when the occupant is seated, the upper surface of the center portion in the vehicle width direction of the floor panel can support the center portion in the vehicle width direction of the seat cushion of the occupant seating seat from the lower side of the vehicle body. The outer side of the seat cushion of the occupant seating seat is positioned below the lower side of the vehicle body by the upper wall portion of the convex portion of the seat bracket at the lower position of the floor panel without providing a raised portion at the lower part of the occupant seating seat. Can be supported from .

  According to the second aspect of the present invention, the rocker can be prevented from being broken at the time of a vehicle collision.

  According to the third aspect of the present invention, the outer side portion of the floor panel in the vehicle width direction can be reinforced.

  According to the fourth aspect of the present invention, the vehicle width direction outer side portion of the floor panel can be further reinforced.

  A first embodiment of a lower body structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle body front side, an arrow UP indicates the vehicle body upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a perspective view of the vehicle body lower structure according to the present embodiment as viewed from the front side of the vehicle body obliquely, and FIG. 2 is a front view of the vehicle body lower structure according to the embodiment as viewed from the front side of the vehicle body. Has been. FIG. 3 is a plan view seen from above the vehicle body excluding the seat of the vehicle body lower structure according to the present embodiment.

  As shown in FIG. 1, a rocker 10 according to the present embodiment includes a rocker outer 12 having a hat-shaped cross section in which an opening constituting an outer portion in the vehicle width direction of the rocker 10 faces inward in the vehicle width direction, and a vehicle width direction of the rocker 10. A closed cross section 16 having a substantially rectangular cross section extending along the longitudinal direction of the vehicle body is formed by a rocker inner 14 having a hat-shaped cross section with an opening constituting the inner side facing outward in the vehicle width direction.

  The closed cross-sectional portion is a cross-sectional structure in which the opening outer peripheral portion of the target cross section is substantially continuous and has high strength and high rigidity, and substantially the target cross section is the outer periphery. Even if a hole or the like that is smaller than the length is partially formed, there is no hole on the front side or the back side in the right-angle direction (longitudinal direction) of the cross section, and a configuration in which members around the opening are continuous is included. Means that.

  Specifically, an upper wall portion 12B is formed at the upper end portion of the vertical wall portion 12A of the rocker outer 12 toward the inner side in the vehicle width direction, and the upper wall portion 12B has an upper end in the vehicle width direction inner end portion. A flange 12 </ b> C is formed toward the front. Further, a lower wall portion 12D is formed at the lower end portion of the vertical wall portion 12A of the rocker outer 12 so as to face substantially inward in the vehicle width direction, and downward toward the inner end portion in the vehicle width direction of the lower wall portion 12D. The flange portion 12E is formed.

  On the other hand, an upper wall portion 14B is formed at the upper end portion of the vertical wall portion 14A of the rocker inner 14 toward the outside in the vehicle width direction, and the upper wall portion 14B is directed upward at the outer end portion in the vehicle width direction. A flange 14C is formed. The flange 14C is welded (coupled by welding) to the flange 12C of the rocker outer 12. Further, a lower wall portion 14D is formed at the lower end portion of the vertical wall portion 14A of the rocker inner 14 toward the outside in the vehicle width direction, and the lower wall portion 14D is directed downward at the outer end portion in the vehicle width direction. A flange 14E is formed. The flange 14E is welded to the flange 12E of the rocker outer 12.

  On the inner side in the vehicle width direction of the rocker inner 140, a rear side member 20 as a side member is disposed substantially along the longitudinal direction of the vehicle body. The cross-sectional shape of the rear side member 20 viewed from the front-rear direction of the vehicle body is an L-shape with the opening facing outward and upward in the vehicle width direction, and the cross-section extending along the front-rear direction of the vehicle body is formed by the rocker inner 14 and the floor panel 22. A rectangular closed section 24 is formed.

  Specifically, an inclined portion 22A as a low position portion inclined from the vehicle width direction inner side upper side to the vehicle width direction outer side lower side is formed in the vehicle width direction outer side portion of the floor panel 22, and the lower end of the inclined portion 22A A flange 22B is formed at the edge portion toward the outer side in the vehicle width direction. The flange 22B is welded to the upper surface of the upper wall portion 14B of the rocker inner 14. Further, a flange 20B is formed at the upper end of the vertical wall portion 20A of the rear side member 20 inward in the vehicle width direction, and this flange 20B is in the vehicle width direction on the lower surface of the inclined portion 22A of the floor panel 22. It is welded to the middle part. Further, a lower wall portion 20C is formed from the lower end of the vertical wall portion 20A of the rear side member 20 toward the outer side in the vehicle width direction. A flange 20D is formed. The flange 20D is welded to an intermediate portion in the vertical direction on the inner side surface in the vehicle width direction of the vertical wall portion 14A of the rocker inner 14.

  The center part 22C in the vehicle width direction of the floor panel 22 is arranged substantially horizontally, and the inclined parts 22A are connected to both ends in the vehicle width direction of the center part 22C in the vehicle width direction. A seat cushion 32 of a rear seat 30 as an occupant seat is disposed on the upper surface 22D of the vehicle width direction central portion 22C of the floor panel 22, and the vehicle width direction outer end portion 32A of the seat cushion 32 The panel 22 has reached a position above the inclined portion 22A.

  A seat bracket 36 is disposed between the vehicle width direction outer side end portion 32 </ b> A of the seat cushion 32 and the inclined portion 22 </ b> A of the floor panel 22. The seat bracket 36 is fixed to the upper surface 22E of the inclined portion 22A of the floor panel 22, and forms a closed cross-sectional portion 38, 40 along the vehicle body front-rear direction with the inclined portion 22A of the floor panel 22. The shapes of the cross-sectional portions 38 and 40 viewed from the front-rear direction of the vehicle body are trapezoidal.

  Specifically, the seat bracket 36 is formed of a corrugated plate material having two convex portions 42 and 44 extending in the vehicle body longitudinal direction, and the upper portion of the convex portions 42 and 44 set at the same height in the vehicle vertical direction. The wall portions 42A and 44A support the lower surface 32B of the vehicle width direction outer end portion 32A of the seat cushion 32 from the lower side of the vehicle body. A flange 44C is formed from the lower end of the outer wall portion 44B of the convex portion 44 on the outer side in the vehicle width direction toward the outer side in the vehicle width direction. The flange 44C sandwiches the flange 22B of the floor panel 22 ( Via the upper surface of the upper wall portion 14B of the rocker inner 14.

  On the other hand, a flange 42C is formed from the lower end of the inner wall portion 42B of the convex portion 42 on the inner side in the vehicle width direction toward the diagonally upper side in the vehicle width direction, and the flange 42C is the upper end portion of the inclined portion 22A of the floor panel 22 The upper surface 22F is welded. Further, the connecting wall portion 42E that connects the lower end of the inner wall portion 44D of the convex portion 44 on the outer side in the vehicle width direction and the lower end of the outer wall portion 42D of the convex portion 42 on the inner side in the vehicle width direction is an inclined portion of the floor panel 22 It is welded to the upper surface 22G of the middle part in the vehicle width direction at 22A. Further, the connecting wall portion 42E is welded to the flange 20B of the rear side member 20 with the inclined portion 22A of the floor panel 22 interposed therebetween.

  Therefore, in the present embodiment, the seat bracket 36 can support the outer end 32A in the vehicle width direction of the seat cushion 32 of the rear seat 30. For this reason, in the present embodiment, in the vertical direction of the vehicle width direction outer end portion 32A of the seat cushion 32, compared to the conventional configuration in which the raised portion is provided below the vehicle width direction outer end portion 32A of the seat cushion 32 of the rear seat 30. The thickness M1 can be reduced. That is, in the present embodiment, the vertical thickness M1 of the outer end 32A in the vehicle width direction of the seat cushion 32 can be made the same as the thickness M2 of other portions (intermediate portion in the vehicle width direction).

  The cross-sectional area of the closed cross-section portion 40 is larger than the cross-sectional area of the closed cross-section portion 38, and the closed cross-section portion 40 is located above the closed cross-section portion 24 formed by the rear side member 20, the floor panel 22, and the rocker inner 14. overlapping.

  A rectangular attachment hole 50 for fixing the seat cushion 32 of the rear seat 30 is formed in the front side portion of the upper wall portion 44A of the convex portion 44 on the outer side in the vehicle width direction of the seat bracket 36.

  As shown in FIG. 2, on the lower surface 32B of the vehicle width direction outer end portion 32A of the seat cushion 32 of the rear seat 30, there are engaging claws 52 for fixing the seat cushion 32 of the rear seat 30 to the seat bracket 36 below the vehicle body. It is formed so as to protrude. The engaging claw 52 is engaged with an attachment hole 50 formed in the front side portion of the upper wall portion 44A of the convex portion 44 on the outer side in the vehicle width direction of the seat bracket 36. Accordingly, the seat cushion 32 of the rear seat 30 is fixed in a state where the lower surface 32B of the vehicle width direction outer side end portion 32A is abutted and supported from the lower side of the vehicle body by the upper wall portions 42A, 44A of the convex portions 42, 44.

  As shown in FIG. 3, the closed cross-section portions 38 and 40 extend in the vehicle longitudinal direction along the closed cross-section portion 16 on the inner side in the vehicle width direction of the closed cross-section portion 16 of the rocker 10. For this reason, the closed cross-section portion 16 of the rocker 10 is reinforced by the closed cross-section portions 38 and 40 formed by the seat bracket 36. In the case of deformation in the direction of arrow A), the rocker 10 can be prevented from being bent by the closed cross-sectional portions 38 and 40 formed by the seat bracket 36.

  As shown in FIG. 3, the seat bracket 36 finds a position P1 (folding point) where the rocker 10 bends in the rearward collision of the vehicle in the configuration (vehicle body) when the seat bracket 36 is not provided, and this folding point P1. It is arranged along the vehicle body front-rear direction.

  Next, the operation of this embodiment will be described.

In the vehicle body lower structure of the present embodiment, as shown in FIG. 2, the convex portion of the seat bracket 36 in which the vehicle width direction outer end portion 32A of the seat cushion 32 of the rear seat 30 is fixed to the upper surface of the inclined portion 22A of the floor panel 22. The upper wall portions 42A and 44A of the wheels 42 and 44 are supported from the lower side of the vehicle body. Accordingly, when the passenger is seated, the lower surface of the center portion in the vehicle width direction of the seat cushion 32 of the rear seat 30 can be supported from the lower side of the vehicle body by the upper surface 22D of the center portion 22C in the vehicle width direction of the floor panel 22 . A convex portion 42 of the seat bracket 36 is formed at the inclined portion 22A of the floor panel 22 at the vehicle width direction outer end portion 32A without providing a raised portion at the lower portion of the vehicle cushion width direction outer end portion 32A of the seat cushion 32 toward the vehicle body lower side. , 44 can be supported from below the vehicle body by the upper wall portions 42A, 44A .

  For this reason, in the present embodiment, in the vehicle width direction of the seat cushion 32, compared to a conventional configuration in which a raised portion is provided below the vehicle width direction outer side end portion 32 </ b> A of the seat cushion 32 of the rear seat 30. The thickness M1 in the vertical direction of the outer end portion 32A can be reduced, and the seat cushion 32 can be reduced in size. Further, in the present embodiment, since there is no raised portion at the vehicle width direction outer side end portion 32A of the seat cushion 32, the urethane hardness of the seat cushion 32, which has been performed to prevent the raised portion from sinking when seated, is performed. There is no need to make adjustments.

  As a result, in the present embodiment, since the structure of the seat cushion 32 is simplified compared to the conventional configuration in which the raised portion is provided at the lower portion of the vehicle width direction outer end portion 32A of the seat cushion 32 of the rear seat 30, the number of parts is reduced. It can be reduced and the cost can be reduced. Further, since the seat bracket 36 is a corrugated sheet material having two convex portions 42 and 44 extending in the longitudinal direction of the vehicle body, the manufacture of the seat bracket 36 is easy, and this also reduces the cost.

  Further, in the vehicle body lower structure of the present embodiment, as shown in FIG. 1, the closed cross-section portions 38 and 40 formed by the seat bracket 36 and the inclined portion 22 </ b> A of the floor panel 22 are formed on the closed cross-section portion 16 of the rocker 10. On the inner side in the vehicle width direction, the vehicle body extends in the longitudinal direction of the vehicle body along the closed section 16. For this reason, the vehicle width direction outer side part of the floor panel 22 can be reinforced by the closed cross-section parts 38 and 40. As a result, when the rocker 10 is about to deform in the vehicle width outward direction (the direction of arrow A in FIG. 3) or the like when the vehicle is rearwardly bumped, the closed cross-section portions 38 and 40 formed by the seat bracket 36 are used. Thus, the lateral folding of the rocker 10 can be suppressed. Further, by reinforcing with the closed cross-section portions 38 and 40, it is possible to prevent separation of the rocker inner 14 and the rear side member 20, which is difficult to prevent only by shearing the welding point with the floor panel 22.

  Further, in the present embodiment, the seat bracket 36 is also used in comparison with a configuration in which a reinforcing member such as a patch or a bulkhead is provided inside the closed section 16 of the rocker 10 in order to prevent the rocker 10 from being bent. The number of parts can be reduced and the cost can be reduced.

In the present embodiment, the rear side member 20, the rocker inner 14, and the floor panel 22 disposed on the inner side in the vehicle width direction of the rocker 10 form a closed cross-sectional portion 24 that extends along the vehicle body longitudinal direction. For this reason, the outer side part in the vehicle width direction of the floor panel 22 can be reinforced also by the closed cross section 24. Further, in the present embodiment, the closed cross-section portion 24 and the closed cross-section portion 40 formed by the seat bracket 36 and the inclined portion 22A of the floor panel 22 overlap each other in the vertical direction of the vehicle body along the respective longitudinal directions. The outer portion of the panel 22 in the vehicle width direction can be further reinforced.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above-described embodiment, the seat bracket 36 is configured by the corrugated plate material having the two convex portions 42 and 44 extending in the vehicle longitudinal direction. However, the seat bracket 36 includes one convex portion or three or more extending in the vehicle longitudinal direction. It is good also as a structure which has a convex part. Further, the seat bracket 36 is not limited to the corrugated plate material, and may have other shapes such as a box shape having wall portions on the front, rear, left and right sides.

  Moreover, in the said embodiment, although the shape seen from the vehicle body front-back direction of the closed cross-section parts 38 and 40 was made into trapezoid, the shape seen from the vehicle body front-back direction of the closed cross-section parts 38 and 40 was rectangular shape, semicircle shape, etc. Other shapes may be used.

  Moreover, in the said embodiment, although inclined part 22A inclined from the vehicle width direction inner side upper direction as a low position part to the vehicle width direction outer side downward was formed in the vehicle width direction outer side part of floor panel 22, it replaced with inclined part 22A. In addition, another low position portion such as a stepped portion may be formed on the outer side portion of the floor panel 22 in the vehicle width direction.

  Moreover, in the said embodiment, although the rocker 10 has been arrange | positioned on the vehicle width direction outer side of 22 A of inclination parts of the floor panel 22, it is good also as a structure which does not arrange the rocker 10 on the vehicle width direction outer side of the inclination part 22A of the floor panel 22.

  In the above embodiment, the rear side member 20 is disposed below the inclined portion 22A of the floor panel 22. However, the rear side member 20 may not be disposed below the inclined portion 22A of the floor panel 22.

  In the above embodiment, the cross-sectional shape of the rear side member 20 viewed from the front-rear direction of the vehicle body is an L shape with the opening facing outward and upward in the vehicle width direction. The shape may be other shapes such as a hat shape with the opening directed upward of the vehicle body.

  In the above embodiment, the seat cushion 32 of the rear seat 30 is fixed to the seat bracket 36 by the engaging claws 52, but the seat cushion 32 can be fixed to the seat bracket 36 by other fixing means such as a fastening member. Good.

It is the perspective view seen from the vehicle body diagonally forward outer side which shows the vehicle body lower part structure concerning one Embodiment of this invention. It is the front view seen from the vehicle body front which shows the vehicle body lower part structure concerning one Embodiment of this invention. It is the top view seen from the vehicle body upper part except the sheet | seat which shows the vehicle body lower part structure which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rocker 14 Rocker inner 16 Closed cross-section part 20 Rear side member 22 Floor panel 22A The inclined part (low position part) of a floor panel
24 Closed section 30 Rear seat (passenger seat)
32 Seat cushion 36 Seat bracket 38 Closed section 40 Closed section 42 Convex part 44 Convex part 50 Mounting hole 52 Engaging claw

Claims (4)

A floor panel formed with a low position portion whose height in the vertical direction of the vehicle body is lower than the central portion in the vehicle width direction at the outer end portion in the vehicle width direction;
A seat cushion of an occupant seating seat disposed above the floor panel and having an outer portion in the vehicle width direction reaching above the low position portion;
A seat bracket that is fixed to the upper surface of the floor panel at a low position of the floor panel and includes a convex portion that forms a closed cross-sectional portion along the vehicle longitudinal direction with the floor panel;
Have a, when the occupant seated wherein the upper surface of the vehicle width direction central portion of the floor panel to support the lower surface of the vehicle width direction central portion of the seat cushion from the vehicle body lower side, the upper wall portion of the convex portion of the seat bracket The lower body structure of the vehicle body, wherein the lower surface of the outer end portion of the seat cushion in the vehicle width direction is supported from the lower side of the vehicle body.   An outer end portion in the vehicle width direction of the seat bracket is fixed to a rocker disposed along the vehicle front-rear direction on the outer side in the vehicle width direction of the low position portion of the floor panel via the floor panel. The vehicle body lower structure according to claim 1.   Below the seat bracket, a side member is disposed on the inside of the rocker in the vehicle width direction, and the floor panel and the rocker form a closed cross-section along the vehicle body front-rear direction through the floor panel. The vehicle body lower part structure according to claim 2, wherein the vehicle body lower part structure is provided. A closed cross section formed by the seat bracket and the floor panel, and a closed cross section formed by the side member, the floor panel, and the rocker overlap each other in the vertical direction of the vehicle body along their respective longitudinal directions. The vehicle body lower part structure according to claim 3.

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