JP2010126105A - Reinforcing structure of seatback mounting part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a seatback mounting part capable of sufficiently reinforcing the seatback mounting part while suppressing an increase in mass and an increase in cost by reinforcing the seatback mounting part. <P>SOLUTION: The reinforcing structure of the seatback mounting part comprises a reinforcing plate 8 having a projecting section which is arranged across a center in the longitudinal direction of a center floor tunnel 7 of an automobile, and a reclining bracket 9 in which a front lower part 9a is jointly fastened to a rear floor panel 6 together with the reinforcing plate 8, and a rear lower part 9d is fastened to a rear cross member 5b located at a rear end of the rear floor panel 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing structure for a mounting portion of a reclining seat back of an automobile.

  2. Description of the Related Art Conventionally, many automobile seats are configured such that a seat back can be reclined independently of a seat cushion. This type of rear seat back can be moved forward and backward by a support member that supports a shaft for pivotally supporting the seat back, called a reclining bracket, fixed to a floor panel that is a part of the vehicle body. It is supported. For example, as shown in FIG. 2, a total of four reclining brackets are arranged at the right and left ends in the vehicle width direction and one on the left and right sides of the center portion with appropriate intervals. As shown in the figure, the left and right rear seat backs can be reclined independently.

  By the way, when the vehicle is suddenly stopped, the load may move forward from the cargo compartment at the rearmost part of the passenger compartment and collide with the rear of the rear seat back. At this time, a tensile load of the seat belt is applied to the rear seat back. In this case, a force is applied to the reclining bracket that supports the rear seat back so that the reclining bracket is rotated forward. In such a case, strong downward input occurs to the rear floor panel that supports the reclining bracket.

Therefore, conventionally, as shown in FIG. 3, the mounting portion 103 of the rear seat back 102 of this type is a center that is bridged from the cross member 105 extending in the vehicle width direction to the front end of the rear floor panel 106 at the lower rear of the rear seat back 102. A reinforcement structure in which one of the reclining brackets 109 is fixed on a seat reinforcement 108 having a substantially rectangular cross section extending in the vehicle longitudinal direction along the floor tunnel 107, and a load applied to the rear seat back 102 at the time of sudden deceleration of the automobile or the like. Is distributed to the cross members 105a, 105b, etc., and the input to the rear floor panel 106 is suppressed.
Such conventional seat back mounting structure is disclosed in Patent Documents 1 to 3.
JP 2008-268810 A JP-A-10-129534 Japanese Patent Application Laid-Open No. 07-144661

  However, in the conventional reinforcement structure 101 for the rear seat back mounting portion, the seat reinforcement 108 has a configuration in which the upper member 108a and the lower member 108b having a U-shaped cross section are combined. Also grows. Further, the combination requires joining by arc welding 108c, and there is a problem that the cost is increased.

  The present invention has been created in view of the above problems, and a seat that can sufficiently reinforce the seat back mounting portion while suppressing an increase in mass and cost increase due to the reinforcement of the seat back mounting portion. It aims at providing the reinforcement structure of a back attachment part.

  In order to achieve the above object, the present invention provides a structure for reinforcing a reclining seat back to a vehicle body, and has a convex cross-sectional shape of the center floor tunnel at the center in the front-rear direction of the center floor tunnel of the vehicle body. A reinforcing plate formed along the center floor tunnel is disposed on the floor panel so as to straddle the center floor tunnel.

  The reclining bracket that supports the shaft for pivotally supporting the seat back is preferably fixed to the floor panel via a reinforcing plate.

  It is desirable that the reclining bracket is fixed to a floor panel with a front lower portion through a reinforcing plate and a rear lower portion with respect to a cross member extending in the vehicle width direction behind the lower portion of the seat back.

  According to the present invention, in the reinforcement structure of the seat back mounting portion, the reinforcing plate formed along the center floor tunnel is attached to the center floor tunnel at the center portion in the front-rear direction of the center floor tunnel having a convex section. The front lower part of the reclining bracket located near the center in the vehicle width direction is fixed to the floor panel via the center floor tunnel, and the rear lower part of the reclining bracket is arranged below the lower part of the seat back. In this case, it is fixed to the cross member extending in the vehicle width direction, and the input that pushes the lower front portion of the reclining bracket downward so that the load applied to the seat back causes the reclining bracket to roll forward while being low-cost and lightweight. When it becomes, deformation of the front lower part of the reclining bracket At the same time, the reinforcing plate abuts the entire outer shape of the center portion in the longitudinal direction of the center floor tunnel, so that the load is received in a wider area and dispersed in the center floor tunnel. Movement can be suppressed.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIG. The reinforcing structure 1 for the rear seat back mounting portion in the illustrated embodiment includes a front seat (not shown) including a driver seat (not shown) and a passenger seat (not shown), and a rear seat disposed behind the front seat. In a vehicle (not shown) having a (partially omitted) and a luggage compartment located behind the rear seat, a rear seat back 2 constituting the rear seat is attached to the vehicle (partially omitted) so as to be reclining. It is for reinforcement.

  The rear seat back mounting portion 3 is disposed substantially horizontally between a step portion 4 that is substantially vertically raised at the front end and is long in the vehicle width direction, and a rear cross member 5b that is long at the rear end in the vehicle width direction. The rear floor panel 6 is positioned at the rear part. A center floor tunnel 7 extending in the vehicle front-rear direction is provided at the center of the rear floor panel 6 in the vehicle width direction, and protrudes from the upper surface of the rear floor panel 6 in a convex section.

  The reinforcing structure 1 for the rear seat back mounting portion includes a reinforcing plate 8 and reclining brackets 9, 10, 11, and 12.

  The reinforcing plate 8 is formed by bending a metal plate, is formed in a cross-sectional convex shape along the convex shape of the center floor tunnel 7, has horizontal portions 8a and 8b on both ends in the vehicle width direction, respectively, The insides of the parts 8a and 8b in the vehicle width direction have upright portions 8c and 8d that rise substantially vertically, and have an upper surface portion 8e that extends between the upper ends of the left and right upright portions 8c and 8d. Fastening holes 8f and 8g for inserting bolts (not shown) are formed at both ends of the reinforcing plate 8 in the vehicle width direction. In the left horizontal portion 8a, a fastening hole (not shown) is formed through which a bolt (not shown) for fastening the front lower portion 9a of the reclining bracket 9 to the rear floor panel 6 is inserted.

  The reinforcing plate 8 configured as described above is disposed so as to straddle the center floor tunnel 7 in the vehicle width direction at a substantially central portion of the center floor tunnel 7 in the vehicle front-rear direction, via the fastening holes 8f and 8g. Are fixed to the rear floor panel 6 with bolts / nuts (not shown), and further, a co-clamping hole 9b formed in the front lower portion 9a of the reclining bracket 9 is combined with the co-clamping hole, It is fixed to the rear floor panel 6 with bolts / nuts (not shown).

  One reclining bracket 9, 10, 11, 12 is provided at each of the left and right ends on the rear floor panel 6 immediately before the rear cross member 5b, and the center floor tunnel on the rear floor panel 6 immediately before the rear cross member 5b. There are four types, one at the right side position of 7 and one at the left side position of the center floor tunnel 7 from the rear cross member 5b to the horizontal portion 8a on the left end side of the reinforcing plate 8.

  The reclining brackets 10 and 11 positioned at both left and right ends have vertical surface portions 10a and 11a that rise substantially vertically and horizontal surface portions 10b and 11b whose lower end portions are bent outward in the vehicle width direction. As a cross-sectional shape, a substantially L-shaped L-shaped plate is formed. Near the upper ends of the vertical surface portions 10a and 11a, shaft holes 10c and 11c penetrating through the front and back for passing a shaft (not shown) that supports the rear seatback 2 are formed. Bolt fastening through holes 10d and 11d are formed at both ends in the width direction of the horizontal plane portions 10b and 11b, that is, in the vehicle longitudinal direction. The reclining brackets 10 and 11 configured in this way are arranged on the rear floor such that the surface directions of the vertical surface portions 10a and 11a coincide with the vehicle width direction with respect to the left and right ends of the rear floor panel 6 immediately before the rear cross member 5b. The panel 6 is fixed with bolts / nuts (not shown) through the through holes 10d and 11d.

  The reclining bracket 12 located on the right side of the center floor tunnel 7 includes an inclined vertical surface portion 12a that rises substantially vertically in the oblique direction toward the rear of the vehicle, and a horizontal surface portion that is bent at the lower end portion inward in the vehicle width direction. 12b, and is formed in an L-shaped plate having a substantially L-shaped cross section as a whole. Near the upper end of the inclined vertical surface portion 12a, a shaft hole 12c penetrating the front and back for passing the shaft is formed. At both ends in the width direction of the horizontal plane portion 12b, that is, in the vehicle front-rear direction, a fastening hole 12d for bolting the rear floor panel 6 together with the reinforcing plate 8 is formed. In the reclining bracket 12 configured as described above, the surface direction of the inclined vertical surface portion 12a coincides with the vehicle width direction, and the shaft holes 10c and 11c of the reclining brackets 10 and 11 disposed at both the left and right ends in the vehicle width direction. Bolts / nuts (shown in the figure) through the co-clamping holes 12d together with the co-clamping holes of the horizontal portion 8b on the right side of the reinforcing plate 8 with respect to the rear floor panel 6 so that the hole positions of the shaft hole 12c and the shaft hole 12c coincide with each other. (Omitted).

  The reclining bracket 9 located on the left side of the center floor tunnel 7 includes an inclined vertical surface portion 9c that rises substantially vertically in an oblique direction toward the rear of the vehicle, and a front lower end portion of the inclined vertical surface portion 9c that faces inward in the vehicle width direction. And a rear lower portion 9d formed by bending a rear lower end portion of the inclined vertical surface portion 9c toward the outer side in the vehicle width direction. Near the upper end of the inclined vertical surface portion 9c, a shaft hole 9e penetrating the front and back for passing the shaft is formed. A co-tightening hole 9b for inserting a bolt (not shown) is penetrated through the front lower part 9a. A bolt hole 9f that is fastened with a bolt / nut to the rear cross member 5b is formed in the rear lower portion 9d. In addition, it is preferable to arrange and reinforce the bulk 5a inside the fastening portion of the rear cross member 5b. The reclining bracket 9 configured as described above is attached to the rear floor panel 6 together with a co-clamping hole drilled in the horizontal portion 8a on the left side of the reinforcing plate 8 through a co-clamping hole 9b drilled in the front lower part 9a. Then, the bolt / nut is fastened and the bolt / nut is fastened to the rear cross member 5b through a bolt hole 9f formed in the rear lower portion 9d.

  A rear seat back 2 indicated by a two-dot chain line in FIG. 1 includes four reclining brackets 9, 10, 11, 12, which are configured independently from a rear seat cushion (not shown) at a lower portion and fixed to a rear floor panel 6; The recliner brackets 9, 10, 11, and 12 are pivotally attached to the vehicle so as to be reclinable through shafts inserted through the recliner brackets 9, 10, 11, and 12.

  As described above, the reinforcing structure 1 for the rear seat back mounting portion according to the present invention includes the reinforcing plate 8 having a convex cross section disposed across the center floor tunnel 7 at the center in the front-rear direction of the center floor tunnel 7. A reclining bracket in which the front lower part 9a together with the left horizontal part 8a of the reinforcing plate 8 is fastened to the rear floor panel 6 and the rear lower part 9d is fastened to the rear cross member 5b located at the rear end of the rear floor panel 6. 9, the reclining bracket 12 in which the horizontal surface portion 12 b is fastened to the rear floor panel 6 together with the horizontal portion 8 b on the right side of the reinforcing plate 8, and the horizontal surface portions 10 b and 11 b are fastened to the rear floor panel 6 at the left and right ends of the rear floor panel 6. Reclining brackets 10 and 11, and The rear seat back 2 is caused by a tensile load caused by a seat belt (not shown) or a collision load caused when the load 14 disposed in the cargo compartment 13 behind the rear seat back 2 moves forward and collides with the rear seat back 2 at a high speed. Is applied to the left and right side portions of the center floor tunnel 7 when there is an input that causes the reclining brackets 9, 10, 11, 12, particularly the reclining brackets 9, 12 to move forward. The front lower portion 9a and the front lower end of the reclining brackets 9 and 12 that are positioned are urged downward as indicated by arrows, and the reinforcing plate 8 abuts along the outer shape of the center floor tunnel 7 so that a load is applied to the center floor tunnel 7. And a reclining bracket in which the rear lower part 9d is fixed to the rear cross member 5b. The presence of 9, to disperse the load to the rear cross member 5b, in which is configured to allow suppressing the deformation of the entire rear floor panel 6 and the rear seat back 2. Therefore, the present invention can be implemented in various forms without departing from the gist of the present invention, and can be applied not only to the rear seat back but also to the front seat.

It is a perspective view which shows the structure of the reinforcement structure of the rear seat back mounting part which concerns on embodiment of this invention. It is a perspective view which shows the structure of the reinforcement structure of the conventional rear seat back attaching part. (A) is a perspective view which shows the structure of the sheet reinforcement in FIG. 2, (b) is sectional drawing which shows the AA cross section of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcement structure of rear seat back mounting part 2 Rear seat back 3 Rear seat back mounting part 4 Step part 5 Cross member 5a Bulk 6 Rear floor panel 7 Center floor tunnel 8 Reinforcement plate 8a Horizontal part 8b Horizontal part 8c Standing part 8d Standing part 8e Top part 8f Fastening hole 8g Fastening hole 9 Reclining bracket 9a Front lower part 9b Joint fastening hole 9c Inclined vertical surface part 9d Rear lower part 9e Shaft hole 9f Bolt hole 10 Reclining bracket 10a Vertical surface part 10b Horizontal surface part 10c Shaft hole 10d Through hole 11 Reclining bracket 11a Vertical part 11b Horizontal surface portion 11c Shaft hole 11d Through hole 12 Reclining bracket 12a Inclined vertical surface portion 12b Horizontal surface portion 12c Shaft hole 12d Co-tightening hole 13 Cargo compartment 14 Load 101 Reinforcing structure-back mounting portion 102 rear seat back 103 rear seat back of the mounting portion 105 cross member 106 rear floor panel 107 center floor tunnel 108 sheet reinforcement 108a upper member 108b lower member 108c arc welding 109 recliner bracket

Claims (3)

Reinforcement structure of the attachment part to the body of the reclining seat back,
A reinforcing plate formed along a convex cross-sectional shape of the center floor tunnel is disposed on the floor panel so as to straddle the center floor tunnel at the center in the front-rear direction of the center floor tunnel of the vehicle body. A structure for reinforcing the seat back mounting portion.   The reinforcement structure of the seat back attachment part according to claim 1, wherein a reclining bracket that supports a shaft for pivotally supporting the seat back is fixed to the floor panel via the reinforcement plate.   The reclining bracket has a front lower portion fixed to the floor panel via the reinforcing plate, and a rear lower portion fixed to a cross member extending in the vehicle width direction behind the lower portion of the seat back. Item 3. A structure for reinforcing a seat back mounting portion according to Item 2.