JP5277205B2 - Seat back frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat back frame structure capable of improving load transmission efficiency to a seat back frame from the vehicle body side with a simple constitution for reducing weight. <P>SOLUTION: A load pass structure includes a lower frame part 13b for connecting mutual lower parts of a pair of side part frame parts 13c and 13d, and a load pass plate 25 arranged in an upper part of the lower frame part 13b and having an inclined channel 28 inclined inside in the seat width direction and downward from the outside side part frame part 13c among the pair of side part frame parts 13c and 13d. An outside end part in the width direction of the inclined channel 28 of the load pass plate 25 is connected to the outside side part frame part 13c, and the lower edge of a lower channel 27 is connected over the substantially whole area in the seat width direction of the lower frame part 13b. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a seat back frame structure having a function of transmitting an impact load input from the side of a vehicle to an inner region in the width direction of the vehicle body.

There is known one that transmits an impact load input from the side of a vehicle at the time of a collision to a vehicle body floor via a seat (see, for example, Patent Document 1).
Specifically, the seat back frame described in Patent Literature 1 protrudes outward in the vehicle width direction from the pair of side frame portions disposed on both sides in the vehicle width direction and the side frame portions on the outer side in the vehicle width direction. A load transmitting piece and a load transmitting member extending in an inclined posture from a height substantially the same as the load transmitting piece in the side frame portion on the outer side in the vehicle width direction to a lower portion of the side frame portion on the inner side in the vehicle width direction. Yes. Moreover, the reclining shaft which is arrange | positioned so that it may bridge between side frame parts and supports a side frame part rotatably is provided in the lower end part of the side frame part.
According to this configuration, the impact load input to the lower portion of the vehicle body side wall is transmitted from the side frame portion on the outer side in the vehicle width direction to the side frame portion on the inner side in the vehicle width direction via the reclining shaft. The impact load input to the upper part of the vehicle is transmitted from the load transmission piece to the side frame portion on the inner side in the vehicle width direction via the load transmission member.

JP 2009-6895 A

However, in the configuration of Patent Document 1 described above, since the load transmitting member is provided independently from the seat back frame so as to bridge between the side frame portions, the bending rigidity is low, and the load transmission member is low with respect to the seat back frame. The load transfer efficiency was not high enough.
On the other hand, in order to secure the bending rigidity of the sheet reinforcing member, an improvement such as increasing the plate thickness of the sheet reinforcing member can be considered, but this leads to an increase in weight of the vehicle and a complicated configuration. is there.

  Accordingly, the present invention is intended to provide a seat back frame structure capable of improving the load transmission efficiency from the side of the vehicle body to the seat back frame with a simple configuration that is reduced in weight.

The invention according to claim 1, which solves the above problem, includes a pair of side frame portions (for example, the side frame portions 13c and 13d in the embodiment) disposed on the left and right sides in the seat width direction, and the pair of side frame portions. A load path structure disposed inside the side frame portion, and the load path structure includes a lower frame portion that connects lower portions of the pair of side frame portions (for example, implementation) a lower frame portion 13b) in the form, are placed on top of the lower frame portion, inclined reinforcing portion inclined from the side frame portions of the outer sheet width direction inside, and the lower of the pair of side frame portions A support plate (e.g., load path plate 25 in the embodiment) having (e.g., inclined channel 28 in the embodiment). Edge in the width direction outer side of the inclined reinforcing portion of the over bets is the is connected to the outside of the side frame portions, said lower edge of the support plate over substantially the entire region in the sheet width direction of the lower frame portion It is connected.

  The invention according to claim 2 is characterized in that a reinforcing plate (for example, the reinforcing plate 32 in the embodiment) is provided in the inclined reinforcing portion of the support plate.

  The invention according to claim 3 is characterized in that the inclined reinforcing portion and the reinforcing plate are formed in a closed cross-sectional shape.

The invention according to claim 4 includes a lower reinforcing portion (for example, the closed cross-section structure portion H1 in the embodiment) that is formed in a closed cross-sectional shape by the support plate and the lower frame portion and extends in the seat width direction. It is characterized by that.

The invention according to claim 5 is provided with a reinforcing plate in the inclined reinforcing portion of the support plate, and the supporting plate is formed in a closed cross-sectional shape with the supporting plate and the reinforcing plate, and And a lower reinforcing portion that is formed in a closed cross-sectional shape by the support plate and the lower frame portion and extends in the seat width direction.

According to the first aspect of the present invention, the impact transmitted to the inclined reinforcing portion via the outer side frame portion by connecting the support plate and the lower frame portion over substantially the entire region in the seat width direction. The load is transmitted to the inner side frame portion via the lower frame portion while being transmitted to substantially the entire area of the load path structure including the support plate and the lower frame portion . That is, the impact load input to the inclined reinforcement portion is received in almost the entire area of the load path structure, and after being dispersed in the entire area of the load path structure, is transmitted to the inner side frame section through the lower frame section. become.
Thereby, the collision load can be quickly transmitted to the inside in the vehicle width direction, and the load transmission efficiency for the seat back frame structure can be improved. In this case, since the load transmission efficiency can be improved, it is not necessary to increase the thickness of the load path structure in order to ensure bending rigidity. Therefore, it is possible to provide a load path structure having a simple configuration that is relatively thin and light in weight.

  According to the second aspect of the present invention, by providing the inclined reinforcing portion with the reinforcing plate, the bending rigidity of the inclined reinforcing portion can be improved, and the deformation of the seat back frame structure can be suppressed. Therefore, the impact load can be effectively transmitted to the inner side frame portion.

  According to the invention described in claim 3, by forming the closed cross-sectional shape with the inclined reinforcing portion and the reinforcing plate, the bending rigidity of the load path structure can be improved, and the deformation of the seat back frame structure can be more reliably suppressed. .

According to the fourth aspect of the present invention, the bending rigidity of the load path structure is improved and the deformation of the seat back frame structure is provided by including the lower reinforcing portion formed in the closed cross-sectional shape by the support plate and the lower frame portion. Can be suppressed more reliably.

  According to the invention described in claim 5, by forming two closed cross-sectional shapes between the side frame portions, the bending rigidity of the load path structure is improved, and the deformation of the seat back frame structure is more reliably suppressed. it can.

It is a rear view of the left side of the front seat compartment of the vehicle seat in the embodiment. It is the perspective view which looked at the vehicle seat in the embodiment from an oblique front side. It is the perspective view which looked at the frame part of the vehicular seat in an embodiment from the slanting front side. It is a disassembled perspective view of the frame part of the seat back in an embodiment. It is an expansion perspective view of the frame part of the seat back in an embodiment. It is an expansion perspective view of the frame part of a seat back in the state where a back pan was removed in an embodiment. It is the perspective view which looked at the frame part of the seat back in an embodiment from the back side. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a rear view of the left side of the front seat compartment. In the drawings, the arrow FR indicates the front of the vehicle, and the arrow OUT indicates the outer side in the width direction of the vehicle.
As shown in FIG. 1, the vehicle body floor 9 is formed with a floor tunnel 12 that protrudes upward along the vehicle body longitudinal direction at the center in the vehicle width direction. A pair of left and right front seats 1, 1 are arranged on both sides of the floor tunnel 12.

A side sill 10 having a closed cross-sectional structure joined to both side edges of the vehicle body floor 9 is provided along the longitudinal direction of the vehicle body on the outer sides of the left and right seats 1, 1. Has been. Here, in FIG. 1, only the skeleton of the sheet 1 is shown for convenience of explanation (the same applies to the following drawings).
On the floor tunnel 12, between the left and right sheets 1 and 1, a console box 5 having a storage portion 5a recessed on the upper surface side is fixed.

FIG. 2 is a perspective view of the vehicle seat 1 installed on the front seat side of the vehicle as seen from the diagonally forward side, and FIG. 3 is a perspective view of the frame portion of the vehicle seat 1 as seen from the diagonally forward side. It is. In the following description, the width direction is the same as the vehicle width direction (seat width direction) unless otherwise specified.
As shown in FIG. 2, the vehicle seat 1 includes a seat cushion 2 that supports an occupant's buttocks, a seat back 3 that is connected to a rear end portion of the seat cushion 2 and supports an occupant's waist and back, A headrest 4 (only the skeleton is shown in FIG. 3) is supported by the upper portion of the seat back 3 and supports the head and neck of the occupant.

As shown in FIG. 3, the seat cushion 2 includes a seat cushion frame 7 to which a rear cross member 6 extending in the width direction is attached to a rear end portion, and the seat cushion frame 7 is seat rails 8, 8. It is attached to the vehicle body floor 9 through the slidable forward and backward.
The seat cushion frame 7 is a member formed in a U shape, and the left and right rear ends extend slightly obliquely upward, and a cushion spring 17 is stretched inside (see FIG. 3).

(Seat back frame structure)
FIG. 4 is an exploded perspective view of the skeleton part of the seat back 3.
As shown in FIGS. 3 and 4, the seat back 3 includes a substantially rectangular frame-shaped seat back frame 13 including an upper frame portion 13 a, left and right side frame portions 13 c and 13 d, and a lower frame portion 13 b. The lower end of the seat back frame 13 is coupled to the rear end portion of the seat cushion frame 7 so as to be tiltable.

  The upper frame portion 13a is made of a substantially U-shaped pipe material, and a support pipe 44 that supports the headrest 4 so as to be movable up and down is attached to the center of the upper side portion extending in the width direction. Moreover, the upper cross member 15 is provided in the upper frame part 13a so that the both ends of the width direction may be bridged. The upper cross member 15 is curved backward from both sides in the width direction to the center portion, and the base end side of the support pipe 44 described above is fixed.

  The left and right side frame parts 13c and 13d are made of a panel material having a substantially U-shaped horizontal cross section, and the region above the substantially central part in the vertical direction has a narrow front-rear width and is lower than the substantially central part. The side region has a relatively wide front-rear width. The narrower upper regions of the side frame portions 13c and 13d are welded and fixed to the corresponding side portions of the upper frame portion 13a so as to wrap from the outside in the width direction at the U-shaped cross-section. A hinge portion 16 connected to the rear end portion of the seat cushion frame 7 and a reclining mechanism 18 for adjusting the tilt angle of the seat back frame 13 are attached to the lower end sides of the side frame portions 13c and 13d. It has been. The left and right reclining mechanisms 18 are coupled to each other by an operating rod 45 extending in the width direction.

  The lower frame portion 13b is made of a panel material having a substantially S-shaped cross section in the vertical direction (see FIG. 8), and extends along the width direction so as to surround the operating rod 45 from the rear in the upper half portion thereof. Both end portions are connected to the lower ends of the left and right side frame portions 13c and 13d.

  The left and right side frame portions 13c and 13d are respectively formed by connecting a front wall 31a and a rear wall 31b that are bent inward in the width direction on the front and rear sides of the side wall 30 on the outer side in the width direction. Thus, the width on the upper side is narrower than the substantially central portion, and the width on the lower side is widened. Specifically, the rear end side of the side wall 30 is formed substantially straight over the entire upper and lower sides, but the front end side is formed substantially straight from the upper part to the central area in the vertical direction, and gradually decreases downward from the central area. Curved to bulge forward. Therefore, the front wall 31a of the side frame portions 13c and 13d is provided with a curved surface that follows the curved shape on the front end side of the side wall 30.

FIG. 5 is an enlarged perspective view of the skeleton part of the seat back 3.
As shown in FIGS. 3 to 5, a back pan 47 made of a plate material made of, for example, resin and curved in a three-dimensional manner is disposed between the side frame portions 13 c and 13 d. Specifically, the back pan 47 includes a pelvic support 22 having a U-shaped horizontal cross section, and extends from both sides of the pelvis support 22, and is on the side of the front wall 31a of the side frame portions 13c and 13d. To the outer surface of the side wall 30.

The pelvis support 22 extends on the rear side in the front-rear direction of the side frame portions 13c and 13d so as to bridge between the side frame portions 13c and 13d, and both sides are side walls 30 of the side frame portions 13c and 13d. It extends toward the front along the inner surface. In other words, the pelvis support 22 supports the pelvis of the occupant from the rear to the lower periphery of the lumbar spine when seated on the occupant's seat 1, and the lower edge portion is the lower frame portion at the center in the width direction. Fastened to 13b with screws or the like.
Moreover, the front-end | tip part 24 is fastened and fixed with the bis | screw etc. on the outer surface side of the side part frame parts 13c and 13d.

(Load path structure)
6 is an enlarged perspective view of the skeleton portion of the seat back 3 with the back pan 47 removed, and FIG. 7 is a perspective view of the seat back 3 as seen from the rear side. FIG. 8 is a cross-sectional view taken along the line AA in FIG.
As shown in FIGS. 6 and 7, a load path plate (support plate) 25 is provided between the back pan 47 and the lower frame portion 13b in the front-rear direction so as to overlap the back pan 47 in the front-rear direction. . The load path plate 25 is made of, for example, metal and has a substantially triangular shape when viewed from the front-rear direction. Specifically, the load path plate 25 is provided with a channel portion 26 having a substantially U-shaped cross section in the vertical direction and extending in a substantially Y shape when viewed from the front-rear direction. Specifically, the channel portion 26 has a U-shaped lower channel 27 formed so as to bridge between the side frame portions 13c and 13d, and a cross section branched from a midway portion in the extending direction of the lower channel 27. And a U-shaped inclined channel (inclined reinforcing portion) 28.

  As shown in FIGS. 4, 6, and 7, the lower channel 27 is disposed so that the opening portion of the U-shaped cross section faces rearward and is engaged with the upper half of the lower frame portion 13b. The entire region of the lower edge portion and the upper edge portion is welded and fixed to the lower frame portion 13b. Specifically, the lower channel 27 has an upper edge portion fixed to the upper edge portion of the lower frame portion 13b, and a lower edge portion fixed to the front surface of the lower frame portion 13b. As a result, the lower channel 27 and the lower frame portion 13b form a closed cross-section structure portion H1 having a rectangular shape in cross section, extending along the width direction between the side frame portions 13c and 13d, and the side frame portion 13c. , 13d contributes to load transmission.

  In addition, the lower channel 27 has an end on the outer side in the width direction fixed to the inner surface of the side wall 30 of the side frame portion 13c, while an end on the inner side in the width direction is connected to the inner surface of the side wall 30 of the side frame portion 13d. There is a slight gap between them. Specifically, the end portion on the inner side in the width direction of the lower channel 27 extends to the inner side of the center portion in the width direction of the lower frame portion 13b, and overlaps the rear wall 31b of the side frame portion 13d when viewed from the front-rear direction. To the position. That is, the lower channel 27 and the lower frame portion 13b are connected over substantially the entire width direction of the lower frame portion 13b. Therefore, also in the above-described closed cross-section structure portion H1, the end portion on the outer side in the width direction is in contact with the inner surface of the side wall 30 of the side frame portion 13c, while the end portion on the inner side in the width direction is on the side wall 30 of the side frame portion 13d. There is a slight gap between the inner surface. The lower channel 27 and the lower frame portion 13b are connected in a range from the outer end in the width direction of the lower frame portion 13b to the inner side of the central portion in the width direction. The lower channel 27 and the lower frame portion 13b overlap with the lower frame portion 13b in the front-rear direction in substantially the entire region in the width direction of the lower end of the lower channel 27.

  The inclined channel 28 is formed continuously from the lower channel 27 and extends obliquely upward from the branching position K with the lower channel 27 toward the outer side in the width direction. A mounting piece 28b (see FIG. 6) bent outward is formed at the outer end in the width direction of the inclined channel 28, and this mounting piece 28b is fixed to the inner surface of the side wall 30 of the side frame portion 13c. ing. In this case, the end surface on the outer side in the width direction of the inclined channel 28 is disposed opposite to a load transmission block 21 described later with the side frame portion 13c interposed therebetween. The inclined channel 28 is formed wider as it goes outward in the width direction, and a bead 28 a bulging outward is formed on the peripheral surface of the inclined channel 28.

  Further, between the lower channel 27 and the inclined channel 28, the flat plate portion 29 is connected to each of the channels 27, 28 so as to bridge an area surrounded by the upper edge portion of the lower channel 27 and the lower edge portion of the inclined channel 28. Are integrally formed. As a result, the inclined channel 28 and the lower frame portion 13 b are connected to each other in the entire extending direction of the inclined channel 28 via the lower channel 27 and the flat plate portion 29.

  Further, a reinforcing plate 32 is provided on the rear surface side of the load path plate 25 so as to cover the opening portion of the inclined channel 28. The reinforcing plate 32 is a plate material formed in an L shape in a cross-sectional view in the vertical direction, and is formed so that the upper side wraps around to the upper edge of the inclined channel 28. Specifically, the reinforcing plate 32 follows a base portion 32a (see FIG. 7) whose base end portion is welded and fixed to the rear surface of the lower frame portion 13b, and the inclined channel 28 as it goes outward in the width direction from the base portion 32a. And an inclined portion 32b that is inclined. The inclined portion 32 b is welded and fixed at the upper edge portion over the entire upper edge portion of the inclined channel 28, and the lower edge portion is welded and fixed to the rear surface of the flat plate portion 29. As a result, the reinforcing plate 32 and the inclined channel 28 form a closed cross-section structure portion H2 (see FIG. 8) having a rectangular shape in cross section extending obliquely upward from the branch position K toward the outer side in the width direction. It contributes to load transmission between the frame parts 13c and 13d.

  That is, in this embodiment, between the side frame portions 13c and 13d, a closed cross-section structure portion H1 extending along the width direction, and a branch from the closed cross-section structure portion H1, and upward toward the outer side in the width direction. It has a closed cross-section structure portion H2 that is inclined, and has two closed cross-section structure portions H1 and H2 in the vertical direction outside the width direction of the seat 1. The load path plate 25, the lower frame portion 13b, and the reinforcing plate 32 constitute a load path structure.

(Surface elastic body and support wire)
Here, as shown in FIGS. 3 and 5, the opening 14 opened in the front-rear direction between the back pan 47 and the upper cross member 15 has a space between the back pan 47 and the upper cross member 15. The support body wire 20 and the planar elastic body 60 are provided so as to be bridged.

  First, the support wire 20 is, for example, a metal wire bent in a crank shape, and elastically connects between the hook 19 formed on the pelvis support 22 of the back pan 47 and the side frame portions 13c and 13d. It is provided so that it may span. Specifically, the support body wire 20 includes a locking portion 35 (see FIG. 4) locked to the hook 19 of the back pan 47 and an extending portion extending along the width direction from both ends of the locking portion 35. 36 and a folded portion 37 (see FIG. 5) formed at the tip of the extending portion 36 and connected to the side frame portions 13c and 13d, respectively. The hook 19 described above of the back pan 47 is a tongue-like member that is formed such that the upper part of the pelvis support 22 is cut and raised and extends downward.

The locking portion 35 is bent and formed in a substantially U-shape that opens upward. The bottom portion of the locking portion 35 is locked to the hook 19 of the back pan 47, and both ends of the bottom portion are bent upward. Has been.
The extending portion 36 has a proximal end extending from both ends of the locking portion 35 toward the side frame portions 13c and 13d, and a distal end side thereof being bent forward, and side walls of the side frame portions 13c and 13d. It extends along the inner surface of 30.
The folded portion 37 is formed such that the distal end side of the extending portion 36 is folded back, wraps around the front wall 31a of the side frame portions 13c and 13d, and enters the through hole 41 formed in the front wall 31a. Has been inserted. Thereby, the both ends of the support body wire 20 are connected with the support frame parts 13c and 13d.

  A planar elastic body 60 that elastically bridges the support wire 20 and the upper cross member 15 is provided between the support wire 20 in the opening 14 and the upper cross member 15 described above. The planar elastic body 60 is made of a metal wire stretched in a lattice shape between the upper cross member 15 and the support wire 20, and a pair of bridges that bridge the upper cross member 15 and the support wire 20. A bolster wire 61, a plurality of stringer wires 62 that bridge the bolster wires 61, and a connecting wire 63 that connects the stringer wires 62 together.

The bolster wires 61 extend in parallel to each other along the vertical direction on both sides in the width direction of the sheet 1. The bolster wire 61 is inserted into and fixed to a pair of attachment pieces 64 formed at the upper cross member 15 at the upper end portion, and the lower end portion together with the extending portions 36 of the support wire 20 by the binding device 65. It is bundled. At this time, the bolster wire 61 and the support wire 20 are bundled in the binding device 65 so as to be rotatable around the axes of the wires 20 and 61.
Each stringer wire 62 extends along the width direction, and both ends thereof are wound and fixed to each bolster wire 61. The stringer wires 62 are arranged in parallel along the vertical direction, and the pitch between the stringer wires 62 is set narrower in the lower part than in the upper part. For this reason, the planar elastic body 60 is set to increase in rigidity stepwise from the upper part to the lower part.

The connecting wire 63 extends in parallel with the bolster wire 61, and is arranged so as to connect the central portions in the extending direction of the stringer wires 62.
The wire diameters of the wires 61 to 63 are formed smaller than the wire diameter of the support wire 20 described above. Therefore, the planar elastic body 60 is set to be lower in rigidity than the support wire 20. That is, the opening 14 of the seat back frame 13 of the present embodiment is bridged by the support wire 20 and the planar elastic body 60, and the support wire 20 and the planar elastic body 60 are transferred from the plate-like back pan 47. The rigidity is set to decrease step by step.

(Load transmission member)
FIG. 9 is a sectional view taken along line BB in FIG.
As shown in FIGS. 5, 7, and 9, the side wall 30 on the outer side in the width direction of the side frame portion 13 c is provided with a protruding portion 70 that protrudes toward the outer side in the width direction. The protruding portion 70 is formed in a hollow box shape that opens inward in the width direction, and the rear surface 70a is formed longer in the width direction than the front surface 70b. That is, the front end portion of the front surface 70b abuts on the center portion in the front-rear direction of the side wall 30 of the side frame portion 13c, while the front end portion of the rear surface 70a goes around to the rear wall 31b side of the side frame portion 13c. 13c. Further, an attachment hole 70c for attaching a side airbag device 51 described later is formed on the front surface 70b of the protruding portion 70. Note that a bead 70 d extending along the width direction is formed on the outer peripheral surface of the protruding portion 70, and configured to suppress buckling of the protruding portion 70.

  A through hole 71 is formed in the side surface 70e of the projecting portion 70, and the tubular guide pipe 72 is inserted and fixed in the through hole 71 by welding. That is, the guide pipe 72 extends along the width direction. There is a slight gap between the axial end surface of the guide pipe 72 and the side wall 30 of the side frame portion 13c.

  As shown in FIGS. 4, 7, and 9, the load transmission block 21 is fixed to the guide pipe 72 in a fitted state. The load transmission block 21 is a member that transmits the impact load input to the side wall of the vehicle body at the time of a side collision of the vehicle to the side frame portion 13c. The load transmission block 21 has a honeycomb structure in which cylindrical cross sections are arranged in parallel by a plurality of ribs 75 extending in the width direction therein, and the whole is formed in a rectangular parallelepiped shape that is long in the vertical direction by resin. . In addition, the load transmission block 21 includes a fitting hole 34 into which a guide pipe 72 protruding from the side frame portion 13 c is fitted. When the fitting hole 34 is fitted to the guide pipe 72, the protruding portion Fastened to 70 with screws or the like.

  Furthermore, an accommodation portion 73 that receives the above-described protrusion 70 is formed inside the load transmission block 21. Thereby, the load transmission block 21 is attached so that it may cover the protrusion part 70 from the width direction outer side. In this case, the load transmitting block 21 is in a state where the end surface on the inner side in the width direction contacts the side wall 30 of the side frame portion 13c and the end surface on the inner side in the width direction of the rib 75 contacts the side surface 70e of the protruding portion 70. The guide pipe 72 is fitted. Further, the front surface side of the load transmission block 21 is formed with a notch 74 that exposes the front surface 70b including the mounting hole 70c of the protrusion 70 when the load transmission block 21 and the protrusion 70 are fitted.

  The load transmitting block 21 fastened and fixed in this manner is projected at a position biased rearward with respect to the longitudinal center of the side wall 30. In this embodiment, the guide pipe 72 and the load transmission block 21 constitute a load transmission member. In addition, the closed cross-section structure part H2 which consists of the above-mentioned inclination channel 28 and the reinforcement plate 32 is arrange | positioned on the opposite side of a load transmission member on both sides of the side part frame part 13c.

  2 and 9, a side airbag device 51 for protecting the occupant is attached to the side wall 30 of the side frame portion 13c and in front of the load transmission block 21.

  As shown in FIG. 9, the side airbag device 51 includes an inflator 52 that detects an impact and generates gas, and a folded bag body 53 that is expanded by receiving the gas pressure of the inflator 52. It is attached to the side frame portion 13c in a state of being accommodated in a bag case 54 having a lid portion that can be opened and closed.

  As shown in FIG. 3, the inflator 52 includes a cylindrical main body portion 52a and a gas discharge port 52b, and is attached to the side frame portion 13c so that the main body portion 52a extends along the longitudinal direction of the side frame portion 13c. It has been. The inflator 52 is fastened and fixed to the support plate 77 provided on the upper portion of the side frame portion 13c and the mounting hole 70c of the protruding portion 70 by screws or the like in front of the load transmission block 21.

  The bag body 53 is disposed on the outer side in the width direction of the gas discharge port 52b of the inflator 52 and at a position facing the front surface 21a of the load transmission block 21 (the front surface 70b of the protruding portion 70). Further, the bag body 53 is folded in the form of being wound in a roll shape a plurality of times in the direction of the inflator 52 from the distal end side toward the root portion side. Therefore, when the bag body 53 receives the gas pressure from the inflator 52, the bag body 53 is smoothly deployed toward the outer side in the width direction and the front side of the vehicle body in such a manner that the entrainment is released from the root portion side. At this time, since the bag body 53 faces the front surface 21a of the load transmission block 21 (the front surface 70b of the protruding portion 70), the unfolding direction is regulated in the vehicle front direction by the front surface of the load transmission block 21, It extends to the front side along the side wall of the vehicle body such as the center pillar 11 and door lining (not shown). That is, the load transmission block 21 and the front surfaces 21 a and 70 b of the protruding portion 70 function as support surfaces for the bag body 53.

  In FIG. 9, 55 is a pad material disposed around the seat back frame 13, the load transmission block 21 and the side airbag device 51, and 56 is a skin material covering the outer surface of the pad material 55. is there. In the case of the present embodiment, the pad material 55 is provided with a slit-like opening 57 that opens to the outside in the width direction, and the load transmission block 21 and the side airbag device 51 are disposed in the opening 57. When gas is supplied from the inflator 52 to the bag body 53 at the time of a side collision, the bag body 53 jumps out of the opening 57 and expands forward by breaking the skin material 56 on the side portion of the seat back 3.

  Further, as shown in FIG. 9, the side airbag device 51 in which the bag body 53 is folded and attached to the side frame portion 13 c is configured so that the outer end portion (of the load transmission block 21 of the load transmission block 21) of the vehicle seat 1. It is set so as to be located on the inner side of the tip portion. For this reason, a space can be provided in a region on the outer side in the width direction on the front side of the load transmission block 21, and this portion can be used effectively.

  Further, as shown in FIG. 4, load transmission blocks 38 and 39 are respectively attached to the outer sides (outside in the width direction) of the reclining mechanism 18 at the lower ends of the side frame portions 13c and 13d on the left and right sides. Each of the load transmission blocks 38 and 39 has a honeycomb structure in which a plurality of cylindrical cross sections extending in the width direction are arranged in parallel, like the load transmission block 21 on the upper side. The load transmission block 39 attached to the side frame portion 13d on the inner side in the width direction faces the side surface of the console box 5 at the center in the width direction.

(Function)
In the above configuration, when an impact load is input to the side of the vehicle body at the time of a side collision of the vehicle, the sensor detects the impact and the inflator 52 of the side airbag device 51 generates gas. The gas generated in the inflator 52 is supplied to the bag body 53, and the bag body 53 breaks the skin material 56 on the side of the sheet 1 and bulges forward from the side of the sheet 1. Thereby, the bag body 53 expands between the occupant seated on the seat 1 and the side wall of the vehicle body.

  At this time, in the vehicle seat 1 of the present embodiment, since the bag body 53 is disposed at a position facing the front surfaces 21b and 70b of the load transmission block 21 (projecting portion 70), the front surfaces 21b and 70b are the bag body 53. Functions as a support surface. That is, since the reaction force when the bag body 53 is deployed can be reliably received by the load transmission block 21 (projecting portion 70), the bag body 53 can be deployed more quickly.

Further, when the side wall of the vehicle body such as the center pillar 11 is deformed in the seat back 3 direction (inward in the width direction) at the time of a side collision of the vehicle, the side wall comes into contact with the load transmission blocks 21 and 38 on the side of the vehicle seat 1. Load is input.
First, when a load is input to the lower load transmission block 38, the load transmission block 39 on the inner side in the width direction comes into contact with the console box 5 as the whole seat 1 moves inward in the width direction. At this time, the load is transmitted to the inner side in the width direction through the closed cross-section structure portion H1 including the lower channel 27 of the load path plate 25 and the lower frame portion 13b of the seat back frame 13. Thereafter, the load transmitted to the closed cross-section structure portion H1 is transmitted to the lower frame portion 13b from the end portion on the inner side in the width direction of the closed cross-section structure portion H1, and the side frame portion on the inner side in the width direction via the lower frame portion 13b. 13d. Then, the load transmitted to the side frame portion 13 d is transmitted to the floor tunnel 12 via the load transmission block 39 and the console box 5. At this time, by forming the closed cross-section structure portion H1, the bending rigidity of the load path structure is improved, the deformation of the seat back frame 13 is suppressed, and the impact load can be effectively transmitted to the console box 5.

When an impact load is input to the upper load transmission block 21, the load is transmitted from the lateral side to the side frame portion 13 c on the outer side in the width direction of the seat back frame 13 from the load transmission block 21.
The load transmitted to the side frame portion 13c is transmitted to the closed cross-section structure portion H2 including the inclined channel 28 and the reinforcing plate 32, and then transmitted obliquely downward toward the inner side in the width direction. Specifically, the load transmitted to the closed cross-section structure portion H2 is transmitted to the closed cross-section structure portion H1 through the entire area of the closed cross-section structure portion H2 and the flat plate portion 29. Then, the load transmitted to the closed cross-section structure portion H1 is transmitted to the lower frame portion 13b from the end portion on the inner side in the width direction of the closed cross-section structure portion H1, and the side frame portion on the inner side in the width direction via the lower frame portion 13b. 13d. Then, the load transmitted to the side frame portion 13 d is transmitted to the floor tunnel 12 via the load transmission block 39 and the console box 5.

  As described above, the impact load input to the load transmission block 21 is received in almost the entire area of the load path plate 25, and after being dispersed in the entire area of the load path plate 25, the inner side frame via the lower frame portion 13b. It is transmitted to the part 13d. At this time, by forming the closed cross-section structure portions H1 and H2 between the side frame portions 13c and 13d, the bending rigidity of the load path structure can be improved and the deformation of the seat back frame 13 can be suppressed. Therefore, the impact load can be effectively transmitted to the console box 5.

  Here, in this embodiment, the load transmission block 21 is fitted into the guide pipe 72 and is fixed so as to cover the box-shaped protrusion 70. Therefore, for example, even when an impact load is input to the load transmission block 21 from a diagonally forward or diagonally rearward direction (a direction intersecting the width direction), the load transmission block 21 is not displaced and directed inward in the width direction. The load can be transmitted.

In the present embodiment, the load path plate 25 (lower channel 27) and the lower frame portion 13b are connected in substantially the entire width direction so that the impact load input to the load path plate 25 via the load transmitting member is After being received in almost the entire area of the path structure and dispersed throughout the entire area of the load path structure, it is transmitted to the inner side frame part 13d via the lower frame part 13b.
Thereby, the collision load can be quickly transmitted to the inside in the vehicle width direction, and the load transmission efficiency to the seat back frame 13 can be improved. In this case, since the load transmission efficiency can be improved, it is not necessary to increase the thickness of the load path structure (load path plate 25, etc.) in order to ensure bending rigidity. Therefore, it is possible to provide a load path structure having a simple configuration that is relatively thin and light in weight.

Further, by providing the reinforcing plate 32 on the rear surface side of the inclined channel 28 so as to cover the opening portion of the inclined channel 28, the bending rigidity of the inclined channel 28 can be improved and the deformation of the seat back frame 13 can be suppressed.
Further, in the present embodiment, the closed cross-section structure portion H2 described above is arranged on the opposite side of the load transmission member with the side frame portion 13c interposed therebetween, so that the side frame portion 13c is interposed via the load transmission member. The input collision load can be efficiently transmitted to the load path structure. Thereby, the load transmission efficiency with respect to the seat back frame 13 can further be improved.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.
For example, in the above-described embodiment, the configuration in which the upper load transmission block 21 is assembled to the box-shaped protrusion 70 has been described. However, the lower load transmission block 38 may be assembled to the box-shaped projection. Absent.
Further, the connection range of the load path plate 25 (lower channel 27) and the lower frame portion 13b is appropriately designed as long as it overlaps with the lower frame portion 13b in the front-rear direction in substantially the entire width direction at the lower end of the lower channel 27. It can be changed. It suffices if it is inside the widthwise central portion of the lower frame portion 13b. In this case, both ends of the lower channel 27 may be fixed so as to be bridged between the side frame portions 13c and 13d.

DESCRIPTION OF SYMBOLS 13 ... Seat back frame 13b ... Lower frame part 13c, 13d ... Side part frame part 25 ... Load path plate 28 ... Inclination channel (inclination reinforcement part)
32 ... Reinforcement plate H1 ... Closed section structure (lower reinforcement)

Claims (5)

A pair of side frame portions disposed on the left and right sides in the seat width direction;
In a seat back frame structure comprising a load path structure disposed inside the pair of side frame parts,
The load path structure includes a lower frame portion connecting lower portions of the pair of side frame portions,
It is placed on top of the lower frame portion, and a support plate having an inclined reinforcing portion inclined from the side frame portions of the outer sheet width direction inside, and the lower of the pair of side frame portions,
An end portion of the support plate on the outer side in the width direction of the inclined reinforcing portion is connected to the outer side frame portion, and a lower edge of the support plate extends over substantially the entire seat width direction of the lower frame portion. Seat back frame structure characterized by being connected to each other.   The seat back frame structure according to claim 1, wherein a reinforcing plate is provided in the inclined reinforcing portion of the support plate.   The seat back frame structure according to claim 2, wherein the inclined reinforcing portion and the reinforcing plate are formed in a closed cross-sectional shape. The seat back according to any one of claims 1 to 3, further comprising a lower reinforcing portion that is formed in a closed cross-sectional shape by the support plate and the lower frame portion and extends in a seat width direction. Frame structure. A reinforcing plate is provided on the inclined reinforcing portion of the support plate,
The support plate and the inclined reinforcing part formed in a closed cross-sectional shape by the support plate and the reinforcing plate;
The seat back frame structure according to claim 1, further comprising: a lower reinforcing portion formed in a closed cross-sectional shape by the support plate and the lower frame portion and extending in a seat width direction.

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