JP2014227120A - Vehicular seat - Google Patents

Abstract

To provide a vehicle seat that can achieve both weight reduction and improved rigidity of a fastening portion with a reclining mechanism in a resin seat back skeleton. A seat back frame is formed of resin, and a metal bracket includes an outer metal bracket and an inner metal bracket. The base 52A of the outer metal bracket 52 is disposed in surface contact with the outer surface 22A of the side frame base 22 of the seat back frame, and the base 54A of the inner metal bracket 54 faces the inner surface 22B of the side frame base 22. Arranged in contact. Bolts 70 and 72 penetrate the outer metal bracket 52, the side frame base 22 and the inner metal bracket 54, and the metal bracket 50 and the side frame base 22 are fastened by the bolts 70 and 72 and the nuts 74 and 76. . [Selection] Figure 1

Description

  The present invention relates to a vehicle seat for passenger seating mounted on a vehicle such as an automobile.

  In patent document 1, the side frame and cross member which comprise the seat back frame of a vehicle seat are integrally molded with resin. Further, in Patent Document 2, a seat back frame of a vehicle seat is formed by bending a single iron plate into a rectangular closed cross-sectional shape, and a joint edge is integrally connected by caulking or welding to form a closed cross-sectional structure. Yes. And in this closed cross-section structure, the iron upper arm which comprises the upper part of the reclining mechanism with which the lower part was fixed to the cushion side frame was inserted, and it fixed with the volt | bolt.

Special table 2010-500198 JP 2002-59770 A

  However, in order to reduce the weight of the vehicle seat, when a resin seat back skeleton as in Patent Document 1 is used and a fastening structure as in Patent Document 2 is applied, a load toward the rear of the seat acts on the seat back. Moreover, the load concentrates on the reclining mechanism side end portion in the resin seat back skeleton. At this time, due to insufficient rigidity of the fastening portion with the reclining mechanism in the resin seat back skeleton, displacement of the upper end of the seat back to the rear of the seat becomes large.

  In view of the above facts, an object of the present invention is to provide a vehicle seat that can achieve both weight reduction and improved rigidity of a fastening portion with a reclining mechanism in a resin seat back skeleton.

  The vehicle seat according to claim 1 is formed of a reclining mechanism provided at a connecting portion between a seat cushion and a seat back, a resin seat back skeleton formed of a resin, and constituting a skeleton of the seat back, and a metal. In the lower part of the side wall portion of the resin seat back skeleton, the outer metal bracket that is in surface contact with the outer side surface in the sheet width direction of the resin seat back skeleton and the inner surface in the sheet width direction of the resin seat back skeleton are in surface contact. A metal bracket fixed to the reclining mechanism, penetrating the outer metal bracket, the resin seat back skeleton and the inner metal bracket, and the resin sheet back skeleton and the metal bracket. And a fastening member that fastens.

  In the vehicle seat according to the first aspect, when a load toward the rear of the seat acts on the seat back frame, the load concentrates on the reclining mechanism side end portion in the resin seat back skeleton. At this time, a metal bracket that is fixed to a reclining mechanism provided at a connecting portion between the seat cushion and the seat back and formed of metal has an outer metal bracket and an inner metal bracket. Further, the outer metal bracket is formed on the outer side surface in the seat width direction of the resin seat back skeleton at the fastening portion with the reclining mechanism that is formed of resin and is the lower portion of the side wall portion of the resin seat back skeleton constituting the seat back skeleton. The inner metal bracket is in surface contact with the inner surface of the resin sheet back skeleton in the sheet width direction. The fastening member passes through the outer metal bracket, the resin sheet back skeleton, and the inner metal bracket, and fastens the resin sheet back skeleton and the metal bracket. For this reason, the rigidity of the fastening part with the reclining mechanism in the resin seat back skeleton is improved. As a result, when a load toward the rear of the seat acts on the seat back frame, the inclination of the fastening member due to the deformation of the fastening portion with the reclining mechanism in the resin seat back skeleton is suppressed, and the displacement of the upper end of the seat back to the rear of the seat is suppressed. Get smaller. Moreover, weight reduction can be achieved by using a resin sheet back skeleton.

  The vehicle seat according to claim 2 is the vehicle seat according to claim 1, wherein the outer metal bracket and the inner metal bracket are coupled to each other on the seat front side of the seat back, and on the seat rear side. Not joined.

  In the vehicle seat according to claim 2, when an outward load acts on the seat back and the load is concentrated on the reclining mechanism side end portion of the resin seat back skeleton, the outer metal bracket and the inner metal bracket are separated from each other. The metal bracket is not deformed on the seat front side of the seat back that is joined, and the outer metal bracket and the inner metal bracket are deformed on the seat rear side of the seat back where the outer metal bracket and the inner metal bracket are not joined. (Twisted). For this reason, the deformation | transformation of a metal bracket can absorb the energy which acts on the reclining mechanism side edge part in a resin seat back frame | skeleton. As a result, breakage of the resin sheet back skeleton can be prevented.

  The vehicle seat according to claim 3 is the vehicle seat according to claim 1, wherein the outer metal bracket and the inner metal bracket form a closed cross-sectional structure when the seat back is viewed from the vertical direction, A fragile portion is formed in the seat rear side wall portion of the closed cross-sectional structure.

  In the vehicle seat according to claim 3, when a load toward the rear of the seat acts on the seat back and the load is concentrated on the reclining mechanism side end portion in the resin seat back skeleton, the seat back is seen from the upper and lower directions. The sheet front side of the metal bracket in which the metal bracket and the inner metal bracket form a closed section structure is not deformed, and the sheet rear side wall portion of the closed section structure in which the fragile portion is formed is broken. Due to this breakage, the outer metal bracket and the inner metal bracket are deformed (twisted) on the seat rear side of the seat back. For this reason, the deformation | transformation of a metal bracket can absorb the energy which acts on the reclining mechanism side edge part in a resin seat back frame | skeleton. As a result, breakage of the resin sheet back skeleton can be prevented.

  According to this invention of Claim 1, weight reduction and the rigidity improvement of the fastening part with the reclining mechanism in a resin seat back frame | skeleton can be made compatible.

  According to the second aspect of the present invention, the resin sheet back skeleton can be prevented from being damaged.

  According to the third aspect of the present invention, breakage of the resin sheet back skeleton can be prevented.

FIG. 4 is an enlarged cross-sectional view taken along a 1-1 cross-sectional line in FIG. 3. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. It is the perspective view which looked at the seat back frame of a 1st embodiment of the present invention from the seat left slanting front. It is the perspective view which looked at the seat back frame of a 1st embodiment of the present invention from the seat left slanting back. It is sectional drawing corresponding to FIG. 2 in the seat back frame of 2nd Embodiment of this invention. It is a side view which shows the outer side metal bracket in the seat back frame of 2nd Embodiment of this invention. It is a side view which shows the outer side metal bracket of the modification of 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 1 in the seat back frame of 3rd Embodiment of this invention.

(First embodiment)
Next, the vehicle seat according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a perspective view of the entire seat back frame 14 of the vehicle seat 10 as viewed obliquely from the front left of the seat. FIG. 4 shows the entire seat back frame 14 of the vehicle seat 10. It is shown in the perspective view seen from the seat left diagonally back. Note that an arrow FR appropriately shown in the drawings indicates the front of the seat, an arrow UP indicates the upper side of the seat, and an arrow IN indicates an inner side in the seat width direction.

  The vehicle seat 10 includes a seat cushion frame (not shown) that forms a skeleton of a seat cushion (not shown) on which an occupant sits, and a skeleton of a seat back (not shown) that supports the back of the seated occupant. The seat back frame 14 shown in FIG. 4 is included. The cushion frame is connected to the vehicle body floor (not shown) of the vehicle via a conventionally known slide mechanism (not shown).

  As shown in FIGS. 3 and 4, the seat back frame 14 as a resin seat back skeleton is formed of resin. The seat back frame 14 connects the side portions 20 on both sides in the seat width direction, the seat upper portion 30 connecting the end portions (upper end portions) on the upper side of the seat portions 20, and the side portions 20 and the upper portion 30. And a rear panel 40 on the rear side of the seat. In addition, the seat back frame 14 has an end portion (lower end portion) below the seat of the side portion 20 connected to an end portion on the seat rear side of the seat cushion via a well-known reclining mechanism 60.

  The side portion 20 includes a side frame base portion 22 extending in the seat vertical direction that forms a side surface of the side portion 20 (side surface of the seat back frame 14), an outer flange portion 24 formed on the seat front side of the side frame base portion 22, And an inner flange portion 26 (see FIG. 4) formed on the seat rear side of the side frame base portion 22.

  The outer flange portion 24 is formed in the seat vertical direction of the side frame base portion 22, and the outer flange portion 24 is bent outward from the side frame base portion 22 in the seat width direction. The “sheet width direction inner side” refers to the center side in the sheet width direction, and the “sheet width direction outer side” refers to the side opposite to the sheet width direction inner side (the side away from the sheet width direction center). Yes.

  The inner flange portion 26 is formed over the entire seat vertical direction of the side frame base portion 22, and the inner flange portion 26 is bent inward in the seat width direction from the side frame base portion 22.

  The back panel 40 connects the inner flange portions 26 on both sides and connects the upper portion 30. The back panel 40 is integrally formed with the side frame base 22 and the base of the upper portion 30. That is, the seat back frame 14 of the present embodiment is an integrally molded product of resin.

  As shown in FIG. 4, the back panel 40 extends in the sheet width direction while the middle portion in the sheet width direction is bent in a concave and convex shape. In addition, this embodiment is not limited to the said structure, For example, you may extend while bending in zigzag shape in a sheet | seat width direction, and you may extend, bending in the shape of a sine wave. Moreover, it is good also as a structure which does not form the flat part, ie, the uneven part, in the intermediate part of the sheet | seat width direction of the back panel 40.

  Moreover, in this embodiment, the metal bracket 50 formed with the metal is provided in the reclining mechanism side edge part used as the lower part of the side frame base part 22 which comprises the side wall part of a resin seat back frame | skeleton.

  As shown in FIG. 1, the metal bracket 50 includes an outer metal bracket 52 provided on the outer side in the seat width direction of the side frame base portion 22 and an inner metal bracket 54 provided on the inner side in the seat width direction of the side frame base portion 22. Have. The base 52 </ b> A of the outer metal bracket 52 is disposed in surface contact with the outer surface 22 </ b> A of the side frame base 22. On the other hand, the base portion 54 </ b> A of the inner metal bracket 54 is arranged in surface contact with the inner side surface 22 </ b> B of the side frame base portion 22. That is, the side frame base portion 22 is sandwiched (pinched) from both sides in the seat width direction by the base portion 52A of the outer metal bracket 52 and the base portion 54A of the inner metal bracket 54.

  The front end portion 52B of the outer metal bracket 52 is bent in the sheet width direction inner side, and the front end portion 54B of the inner metal bracket 54 is bent in the sheet width direction outer direction. The front end portion 52B of the outer metal bracket 52 overlaps the seat rear side of the front end portion 54B of the inner metal bracket 54, and the front end portion 52B of the outer metal bracket 52 and the front end portion 54B of the inner metal bracket 54 are welded or the like. Are combined. On the other hand, the rear end portion 52C of the outer metal bracket 52 and the rear end portion 54C of the inner metal bracket 54 are respectively extended rearward of the seat, and the rear end portion 52C of the outer metal bracket 52 and the rear end portion of the inner metal bracket 54 are respectively extended. 54C is not bonded.

  As shown in FIG. 2, the lower portion 52 </ b> D of the outer metal bracket 52 extends downward from the seat, and the lower portion 52 </ b> D of the outer metal bracket 52 is fixed to the reclining mechanism 60. The reclining mechanism 60 is provided at a connecting portion between the seat cushion and the seat back of the vehicle seat 10 and has a conventionally well-known configuration that swings the seat back in the front-rear direction.

  A bent portion 54D is bent from the lower end edge of the inner metal bracket 54 toward the outside in the sheet width direction, and a flange 54E is formed at the tip of the bent portion 54D toward the lower side of the sheet. The flange 54E of the inner metal bracket 54 is joined to the inner surface in the sheet width direction of the vertical middle portion 52E of the outer metal bracket 52 by welding (spot welding, arc welding) or adhesion.

  As shown in FIG. 1, through holes 62 and 64 are formed in the base portion 52 </ b> A of the outer metal bracket 52, the base portion 54 </ b> A of the inner metal bracket 54, and the side frame base portion 22 at coaxial positions that are spaced apart in the front-rear direction. Has been. In addition, cylindrical collars 66 and 68 made of metal are provided at positions coaxial with the through holes 62 and 64 between the base portion 52A of the outer metal bracket 52 and the base portion 54A of the inner metal bracket 54. Flange 66A, 68A is formed in the edge part by the side of the inner metal bracket 54 in these collars 66, 68, and the flanges 66A, 68A are in contact with the inner metal bracket 54. On the other hand, the end portions 66B and 68B on the outer metal bracket 52 side of the collars 66 and 68 are not formed with flanges, and the end portions 66B and 68B are in contact with the outer metal bracket 52. In addition, the shape of the inner peripheral part of the through holes 62 and 64 in the side frame base 22 corresponds to the shape of the outer peripheral part of the collars 66 and 68 contacting the inner peripheral part of the through holes 62 and 64. , 64 are provided with collars 66, 68 on the inner peripheral side.

  Bolts 70 and 72 as fastening members pass through the through holes 62 and 64 and the collars 66 and 68 from the outer metal bracket 52 side to the inner metal bracket 54 side, and the axes 70A and 72A of the bolts 70 and 72 are the sheet width. Along the direction. Further, nuts 74 and 76 as fastening members are screwed onto the bolts 70 and 72 from the inner metal bracket 54 side. That is, the bolts 70 and 72 and the nuts 74 and 76 fasten the metal bracket 50 having the outer metal bracket 52 and the inner metal bracket 54 and the lower portion of the side frame base portion 22 constituting a part of the resin seat back skeleton. Yes.

  Therefore, the rigidity of the fastening portion with the reclining mechanism 60 in the side frame base portion 22 is improved by the metal bracket 50. As a result, when a load toward the rear of the seat (arrow F in FIG. 3) acts on the seat back frame, the axial lines 70A and 72A of the bolts 70 and 72 due to the deformation of the fastening portion with the reclining mechanism 60 in the side frame base 22 are applied. The inclination with respect to it is suppressed.

  When the load (arrow F in FIG. 3) is large, the metal bracket 50 is provided on the front side of the seatback frame 14 where the front end portion 52B of the outer metal bracket 52 and the front end portion 54B of the inner metal bracket 54 are coupled. The metal bracket 50 is deformed (twisted) so that the outer metal bracket 52 and the inner metal bracket 54 are deformed on the rear side of the seat back frame 14 where the outer metal bracket and the inner metal bracket are not joined. It has become.

  In addition, as resin which forms the seat back frame 14, you may use any of a thermosetting resin and a thermoplastic resin. For example, a resin such as epoxy, polyacetal, polypropylene, or unsaturated polyester resin may be used. Further, the seat back frame 14 may be formed of fiber reinforced resin (FRP). As the fiber reinforced resin, for example, carbon fiber reinforced resin (CFRP), glass fiber reinforced resin (GFRP), natural fiber (for example, bamboo, kenaf, etc.) reinforced resin, or the like can be used. In addition, as a base material (matrix resin) of fiber reinforced resin, you may use the above-mentioned resin (For example, resin, such as nylon, an epoxy, a polyacetal, a polypropylene, unsaturated polyester resin).

Next, the effect of the vehicle seat 10 of this embodiment will be described.
When a load toward the rear of the seat (arrow F in FIG. 3) acts on the seat back frame 14 of the vehicle seat 10, the load concentrates on the lower portion (the reclining mechanism side end portion) of the side frame base portion 22. At this time, the side frame base portion 22 is sandwiched between the base portion 52 </ b> A of the outer metal bracket 52 and the base portion 54 </ b> A of the inner metal bracket 54, and is fastened by bolts 70 and 72 and nuts 74 and 76. For this reason, the rigidity of the fastening part with the reclining mechanism 60 in the side frame base 22 is improved. As a result, when a load toward the rear of the seat (arrow F in FIG. 3) acts on the seat back frame 14, the axes 70 </ b> A and 72 </ b> A of the bolts 70 and 72 due to the deformation of the fastening portion with the reclining mechanism 60 in the side frame base 22. Accordingly, the rearward displacement of the upper end of the seat back frame 14 can be reduced. Moreover, weight reduction can be achieved by using the seat back frame 14 formed of resin.

  Further, in the present embodiment, when a load acts on the lower portion of the side frame base 22, the front end portion 52B of the outer metal bracket 52 and the front end portion 54B of the inner metal bracket 54 are coupled to the front of the seat back frame 14. On the side, the metal bracket 50 is not deformed. On the other hand, on the rear side of the seat back frame 14 where the outer metal bracket 52 and the inner metal bracket 54 are not joined, the outer metal bracket 52 and the inner metal bracket 54 are deformed (twisted). For this reason, the deformation | transformation of the metal bracket 50 can absorb the energy which acts on the reclining mechanism side edge part in the side frame base part 22. FIG. As a result, the side frame base 22 can be prevented from being damaged.

(Supplementary explanation of the embodiment)
In the above, the present invention has been described in detail for specific embodiments. However, the present invention is not limited to the above-described 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, as in the second embodiment shown in FIGS. 5 and 6, a single slit 80 extending in the front-rear direction of the sheet is formed in the vertical intermediate portion 52E of the outer metal bracket 52, and as shown in FIG. The bent portion 54D of the inner metal bracket 54 may be passed through the slit 80, and the flange 54E may be coupled to the outer surface in the sheet width direction of the vertical middle portion 52E of the outer metal bracket 52 by welding or the like. With this configuration, the coupling force between the outer metal bracket 52 and the inner metal bracket 54 can be improved. Further, as in the modification of the second embodiment shown in FIG. 7, the slit 80 may be divided into a plurality of pieces (two in FIG. 7).

  Further, as in the third embodiment shown in FIG. 8, a connecting portion 52F bent in the seat inner direction is formed at the rear end of the outer metal bracket 52, and bent at the rear end of the inner metal bracket 54 in the seat outer direction. The connecting portion 54F may be formed, the connecting portion 52F may be overlapped on the front side of the seat of the connecting portion 54F, and joined by welding or the like, and the metal bracket 50 may have a closed cross-sectional structure when viewed from the top and bottom. Also in this case, when a load toward the rear of the seat (arrow F in FIG. 3) acts on the seat back frame, the axis 70A of the bolts 70 and 72 due to the deformation of the fastening portion with the reclining mechanism 60 in the side frame base 22 The inclination with respect to 72A is suppressed, and the displacement of the upper end of the seat back frame 14 toward the rear of the seat can be reduced. Moreover, weight reduction can be achieved by using the seat back frame 14 formed of resin.

  Moreover, in 3rd Embodiment shown in FIG. 8, at least one of the connection part 52F of the outer side metal bracket 52 used as the back side wall part of a closed cross-section structure, and the connection part 54F of the inner side metal bracket 54 (In FIG. 8, only connection part 54F is shown. 8), as shown by a two-dot chain line in FIG. 8, a weak portion 82 such as a thin portion that breaks when a load is applied may be formed. In this case, the rear side wall portion of the closed cross-sectional structure is broken at the fragile portion 82 when a load is applied, and the outer metal bracket 52 and the inner metal bracket 54 are deformed (twisted). For this reason, the deformation | transformation of the metal bracket 50 can absorb the energy which acts on the reclining mechanism side edge part in the side frame base part 22. FIG. As a result, the side frame base 22 can be prevented from being damaged.

  In each of the above embodiments, the back panel 40 is provided on the seat back frame 14. However, the present invention is not limited to this configuration. For example, instead of providing the back panel 40 on the seat back frame 14, The part 20 may be configured to be reinforced with a cross member.

10 Vehicle Seat 14 Seat Back Frame (Resin Seat Back Framework)
20 side part 22 side frame base (side wall part of resin seat back skeleton)
22A Outer side surface of side frame base 22B Inner side surface of side frame base 50 Metal bracket 52 Outer metal bracket 54 Inner metal bracket 60 Reclining mechanism 62 Through hole 64 Through hole 70 Bolt (fastening member)
72 bolts (fastening members)
74 Nut (fastening member)
76 Nut (fastening member)
82 Vulnerable parts

Claims (3)

A reclining mechanism provided at a connecting portion between the seat cushion and the seat back;
A resin seat back skeleton formed of resin and constituting the skeleton of the seat back;
An outer metal bracket formed of metal and in surface contact with a sheet width direction outer side surface of the resin sheet back skeleton at a lower portion of a side wall portion of the resin seat back skeleton, and a sheet width direction inner side surface of the resin seat back skeleton An inner metal bracket in surface contact, and a metal bracket fixed to the reclining mechanism;
A fastening member that penetrates the outer metal bracket, the resin sheet back skeleton and the inner metal bracket, and fastens the resin sheet back skeleton and the metal bracket;
Vehicle seat equipped with   The vehicle seat according to claim 1, wherein the outer metal bracket and the inner metal bracket are coupled to each other on the front side of the seatback and not on the rear side of the seat.   2. The outer metal bracket and the inner metal bracket form a closed cross-sectional structure when a seat back is viewed from the top and bottom directions, and a fragile portion is formed in a seat rear side wall portion of the closed cross-sectional structure. Vehicle seats.

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