JP5310684B2 - Vehicle seat and seat backboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load to be imposed on the neck of a passenger upon a rear-end collision with a simple structure. <P>SOLUTION: A seat back board 16 includes lower back spring body parts 48 and an upper back spring body part 54. Both ends of each lower back spring body part 48 are vertically connected to a right-and-left pair of lower connecting/fixing parts 50. The lower connecting/fixing parts are hung from the front side of a seat back and fixed to the sidewall parts 26A of right-and-left side frames 26 respectively by using fitting holes 32. Meanwhile, both ends of the upper back spring body part 54 are fixed to the rear wall parts 26C of a right-and-left pair of upper connecting/fixing parts 56 by using fitting holes 34. Accordingly, the fixed position of the upper back spring body part 54 to the side frame 26 is shifted to the rear side of the seat back in an offset manner when compared with the fixed position of the lower back spring body part 48 to the side frame 26. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a vehicle seat and a seat backboard.

  In Patent Document 1 below, a seat back spring composed of an S spring is bridged between a pair of left and right side frames of the seat back frame, and both ends of the seat back spring and the left and right side frames extend and contract in the vehicle front-rear direction. A technique of connecting with possible connecting members is disclosed. The connecting member is configured to extend rearward of the seat back when a load of a predetermined value or more is applied.

  According to the above configuration, when the occupant is pressed against the seat back during a rear collision (hereinafter simply referred to as “rear collision”) and a load of a predetermined value or more is applied to the connecting member, the connecting member extends rearward of the seat back. As a result, the posture of the occupant is maintained, the upper body of the occupant moves to the upper side of the seat back, the head is prevented from shifting from the headrest support position, and the load on the occupant's neck can be reduced. It is.

JP 7-291005 A

  However, in the case of the above prior art, since both ends of the seat back spring arranged in a plurality of stages and the left and right side frames are connected one by one with the connecting member, the number of parts is large and the weight is high. There is a problem of causing an increase and an increase in cost.

  An object of the present invention is to obtain a vehicle seat and a seat backboard that can reduce the load on the occupant's neck at the time of rear collision with a simple configuration in consideration of the above facts.

  A vehicle seat according to a first aspect of the present invention is disposed between a seat back frame having a pair of left and right side frames and a seat width direction between the pair of left and right side frames and a seat back height direction. A plurality of back spring body portions that are bent and deformed in the load acting direction by applying a load to the seat back rear side, a seat back pad disposed on the front side of the back spring body portion, and A cover for covering the surface of the seat back pad, and both ends of the upper back spring main body portion corresponding to the occupant chest of the plurality of back spring main body portions in the seat width direction are the left and right pair The lower back spring main body portion supported by the rear portion of the side frame and provided corresponding to the occupant waist of the plurality of back spring main body portions Both end portions in the sheet width direction is supported by a front portion of the right and left pair of side frames.

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the side frame extends in the front-rear direction of the seat in a plan sectional view and includes a side portion including a front portion of the side frame. And a rear flange portion that is bent inward in the seat width direction from the rear end portion of the side portion and includes the rear portion of the side frame, and further includes a seat width direction of the upper back spring main body portion. The end of is fixed to the rear flange portion via an upper fixing portion.

  The vehicle seat according to a third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the lower back spring main body is made of resin, and the lower back spring main body has a seat width direction. A pair of left and right lower fixing portions that are disposed in front of the seat back of the side frame and are fixed to the side frame are integrally or integrally provided at both end portions.

  A vehicle seat according to a fourth aspect of the present invention is the vehicle seat according to the third aspect, wherein a plurality of the lower back spring main body portions are provided in the seat back height direction, and further, Both end portions in the seat width direction of the side back spring main body portion are connected in the seat back height direction by the pair of left and right lower fixing portions.

  A vehicle seat according to a fifth aspect of the present invention is the vehicle seat according to the third or fourth aspect, wherein the lower back spring main body portion is a resin plate through the pair of left and right lower fixing portions. It is characterized in that it is formed integrally or integrally with a backboard portion that is formed and disposed on the back side of the seat back frame.

  A seat backboard according to a sixth aspect of the present invention is formed between a backboard portion formed of a resin plate material and disposed on the back side of the seatback frame, and a pair of left and right side frames provided in the seatback frame. A plurality of back spring main body portions arranged along the seat width direction and provided in the seat back height direction, and deflected and deformed in the load acting direction when a load on the rear side of the seat back acts. The both ends in the seat width direction of the upper back spring main body provided corresponding to the occupant chest of the plurality of back spring main bodies are supported by the rear portions of the pair of left and right side frames, and The both end portions in the seat width direction of the lower back spring body portion made of resin provided corresponding to the occupant waist portion of the back spring body portion of the The left and right sides supported by the front portions of the pair of side frames, and further, disposed at both ends in the seat width direction of the lower back spring main body in front of the seat back of the side frames and fixed to the side frames. A pair of lower fixing portions are integrally or integrally provided, and at least the lower back spring body portion is integrally or integrally formed on the backboard portion via the pair of left and right lower fixing portions. Is provided.

  According to the first aspect of the present invention, when the occupant is pressed against the seat back at the time of a rear collision, the occupant chest is supported by the upper back spring main body provided corresponding thereto, and the occupant waist is corresponding thereto. The lower back spring main body provided is supported.

  Here, in the present invention, both ends in the seat width direction of the lower back spring body are supported by the front portions of the pair of left and right side frames, whereas both ends in the seat width direction of the upper back spring body are left and right. It is supported by the rear part of a pair of side frame. For this reason, it is possible to delay the rise of acceleration applied to the occupant's chest at the time of a rear collision. In other words, if both ends of the upper back spring main body in the seat width direction are supported by the front portions of the pair of left and right side frames in the same manner as the lower back spring main body, the support position is more forward of the seat back than the structure of the present invention. For a certain amount, the acceleration applied to the passenger's chest becomes faster. On the other hand, if the support position of the upper back spring main body on the side frame is shifted to the rear side of the seat back as in the present invention, the rise of acceleration applied to the passenger chest can be delayed correspondingly. Therefore, the rise of acceleration applied to the occupant chest can be made closer to the rise of acceleration of the occupant head.

  Moreover, according to the present invention, the difference in the seat front-rear direction is provided at the fixing position of the upper back spring main body portion and the lower back spring main body portion to the side frame, so that the number of parts is not particularly increased.

  According to the second aspect of the present invention, the side frame includes the side portion and the rear flange portion. And the edge part of the sheet | seat width direction of the upper back spring main-body part is being fixed to the rear side flange part via the upper side fixing | fixed part instead of the side part of a side frame. For this reason, there is almost no extra length in the upper back spring body when a load is applied to the rear of the seat back during a rear impact. That is, if the end of the upper back spring main body in the seat width direction is fixed to the side of the side frame, the following behavior is exhibited when a load on the rear side of the seat back is applied. That is, the corners of the end portion in the seat width direction of the upper back spring main body are pulled and extended toward the vehicle rear side. For this reason, it is expected that the spring constant of the upper back spring main body portion is deviated from the target value and the amount of bending is increased. On the other hand, in the present invention, the spring constant of the upper back spring body is almost as intended, and the error is reduced.

  According to the third aspect of the present invention, a pair of left and right lower fixing portions are provided at both ends in the seat width direction of the lower back spring main body, and these lower fixing portions are seat backs on the side frames. It is hung from the front side. For this reason, when seated, a load received from the occupant is transmitted from the lower back spring main body portion to the side frame via the pair of left and right lower fixing portions. On the other hand, at the time of a rear collision, the fixing position of the upper back spring main body portion is offset to the rear side of the seat back relative to the fixing position of the lower back spring main body portion, so that the occupant chest (upper back upper portion) enters the seat back.

  According to the fourth aspect of the present invention, a plurality of lower back spring body portions are provided in the seat back height direction, and most of the load acting when the occupant is seated is dispersed by these lower back spring body portions. Will receive. Therefore, the load burden on each lower back spring body is reduced. Further, since the occupant's waist is supported by the plurality of lower back spring main bodies, the cushioning property at the time of sitting is improved.

  According to the fifth aspect of the present invention, the backboard portion formed of a resin plate material is disposed on the back side of the seatback frame. Since the lower back spring body is integrally or integrally provided on the back board via a pair of left and right lower fixing parts, the back board is used as a limiting member for restricting the amount of bending of the lower back spring body. Can be used. Further, when the upper body of the occupant comes into contact with the backboard portion via the lower backspring portion, the load can be received also by the backboard portion. That is, the load transmission path on the occupant waist side is transferred from the lower back spring main body part to the side frame via the pair of lower fixing parts and from the back board part to the side frame via the pair of lower fixing parts. There can be a plurality of transmission paths.

  According to the sixth aspect of the present invention, the seat backboard is formed of a resin plate and is disposed between the backboard portion disposed on the back side of the seatback frame and the pair of left and right side frames included in the seatback frame. A plurality of back spring main body portions arranged along the seat width direction and provided in the seat back height direction, and deflected and deformed in the load acting direction when a load is applied to the seat back rear side. I have.

  Furthermore, both end portions in the seat width direction of the upper back spring body portion provided corresponding to the occupant chest among the plurality of back spring body portions are supported by the rear portions of the pair of left and right side frames, and the plurality of back springs Both end portions in the seat width direction of the resin-made lower back spring main body portion provided corresponding to the occupant waist portion of the main body portion are supported by the front portions of the pair of left and right side frames. A pair of left and right lower fixing portions that are disposed in front of the seat back of the side frame and fixed to the side frame are integrally or integrally provided at both ends of the lower back spring main body in the seat width direction. In addition, at least the lower back spring main body portion is integrally or integrally provided on the backboard portion via a pair of left and right lower fixing portions. Therefore, the effect | action of the characteristic part each demonstrated about the vehicle seat described in any one of Claims 1-5 is obtained.

  As described above, the vehicle seat according to the first aspect of the present invention has an excellent effect that it is possible to reduce the load on the occupant's neck during a rear-end collision with a simple configuration.

  The vehicle seat according to the second aspect of the present invention has an excellent effect that the accuracy with respect to reducing the load on the occupant neck at the time of rear-end collision can be improved.

  The vehicle seat according to the third aspect of the present invention can efficiently transmit the load received from the occupant to the side frame when seated, and can effectively reduce the load on the occupant's neck during a rear-end collision. Has an excellent effect.

  The vehicle seat according to the fourth aspect of the present invention has an excellent effect that the durability of the lower back spring main body portion can be improved and the cushioning property at the time of sitting can be improved to reduce fatigue. .

  The vehicle seat according to the present invention described in claim 5 can suppress or prevent an overload from being applied to the lower back spring main body made of resin, and can be used from the occupant using the entire seat back board. It has an excellent effect of being able to support a load.

  The seat backboard according to the sixth aspect of the present invention has an excellent effect that the load on the occupant's neck at the time of rear collision can be reduced with a simple configuration.

It is a disassembled perspective view of the seat back of the vehicle seat which concerns on this embodiment. It is a perspective view which shows the state by which the resin spring integrated backboard was assembled | attached to the seat back frame shown by FIG. FIG. 3 is an enlarged plan cross-sectional view showing a state in which the seatback is assembled along a line 3-3 in FIG. 2. FIG. 4 is an enlarged plan cross-sectional view showing a state in which the seatback is assembled along a line 4-4 in FIG. 2. FIG. 2 is an enlarged longitudinal sectional view showing an assembled state of the seat back shown in FIG. 1. It is explanatory drawing for demonstrating the effect of this embodiment, and is a side view which shows a mode when a passenger | crew is back-struck in the state which seated on the vehicle seat of this embodiment. It is explanatory drawing for demonstrating the effect of this embodiment, (A) is a principal part plane sectional view which shows the structure of this embodiment in the state at the time of seating, (B) is seating the structure which concerns in comparison It is a principal part plane sectional view shown in the state of the hour, and (C) is a principal part plane sectional view showing the comparative structure in the state at the time of rear collision.

  Hereinafter, an embodiment of a vehicle seat and a seat back board according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

<Overall configuration>
FIG. 1 is an exploded perspective view of a seat back corresponding to the backrest of the vehicle seat according to the present embodiment. In FIG. 1, the angle at which each component is viewed is slightly changed. FIG. 5 shows a longitudinal sectional view of a vehicle seat provided with the seat back. As shown in these drawings, a vehicle seat 10 includes a seat cushion 11 (see FIG. 5) on which an occupant is seated, a seat back 12 that is tiltably supported at a rear end portion of the seat cushion 11, and a seat back. And a headrest supported by the upper end of 12 so as to be movable up and down.

  As shown in FIG. 1, the seat back 12 includes a metal seat back frame 14 that constitutes a skeleton member of the seat back 12, and a resin spring integrated back board (hereinafter referred to as a front plate) mounted on the front side of the seat back frame 14. , Simply referred to as “seat back board”) 16, a seat back pad 18 that constitutes a cushion material of the seat back 12 and is attached from the front side of the seat back board 16 and supported by the seat back frame 14, The back pad 18 mainly includes a cover (skin) 20 that covers the front surface, and a vertical mounting member 22 and a horizontal mounting member 24 for mounting the cover 20 to the seat back board 16. Hereinafter, each component will be described in detail.

<Configuration of the seat back frame 14>
As shown in FIGS. 1 to 5, the seat back frame 14 is viewed from the front (when viewed from the front of the vehicle. Hereinafter, the direction of the vehicle and the direction of the vehicle seat 10 are assumed to be the same. )) In the shape of a rectangular frame. Specifically, a pair of left and right side frames 26 arranged opposite to each other in the vehicle width direction, an inverted U-shaped upper frame 28 that connects the upper ends of the left and right side frames 26, and the left and right side frames 26 And a lower frame 30 that connects lower end portions in the vehicle width direction. The seat back 12 includes all four members including the upper frame 28 by press molding, but other frame structures may be adopted. For example, only the upper frame may be formed of a pipe material bent in an inverted U shape, or the upper frame and a pair of left and right side frames may be configured of a single pipe material bent in an inverted U shape.

  Next, the sectional structure of the left and right side frames 26 will be described. As shown in FIGS. 2 to 4, the side frame 26 includes a side wall portion 26 </ b> A, a front wall portion 26 </ b> B, and a rear wall portion 26 </ b> C. When viewed as a pair on the left and right, it is formed in an open cross-sectional shape with the inside facing the sheet width direction opened in a plan view. The width of the side wall portion 26A becomes narrower from the lower end portion toward the upper end portion as a whole. A plurality of mounting holes 32 (see FIG. 1) are formed in the lower portion of the side wall portion 26A so as to be spaced apart from each other in the vertical direction. The front wall portion 26B extends from the front end of the side wall portion 26A to the inside in the seat width direction and slightly obliquely rearward via an arc surface. The rear wall portion 26C extends inward in the seat width direction from the rear end of the side wall portion 26A, and the front end portion thereof is bent obliquely toward the vehicle front side. The width of the rear wall portion 26C is set sufficiently wider than the width of the front wall portion 26B. A mounting hole 34 (see FIG. 1) is also formed on the upper side of the rear wall portion 26C.

<Configuration of seat back board 16>
Next, the structure of the seat back board 16 which comprises the principal part of the vehicle seat 10 which concerns on this embodiment is demonstrated in detail. As shown in FIGS. 1 to 5 (particularly FIGS. 1 and 2), the seat back board 16 is formed of a resin plate material and has a back board portion 36 disposed on the back side of the seat back frame 14. The resin is made of resin and is provided integrally with the backboard portion 36 and is supported so as to be directly supported by the pair of left and right side frames 26. Further, a load acting on the rear side of the seat back acts on the load acting direction ( And a back spring portion 38 formed to be able to bend and deform toward the vehicle rear side).

  The backboard portion 36 includes a board body 40 that is formed slightly smaller than the seatback frame 14, and a U-groove locking portion 42 that is integrally formed on the outer periphery of the board body 40. . More specifically, the board body 40 is formed slightly smaller than the inner peripheral edge of the opening of the seat back frame 14 formed in a rectangular frame shape. In the assembled state to the seat back frame 14, the board body 40 is disposed slightly on the vehicle rear side between the front end portions (inner end portions) of the rear wall portions 26 </ b> C of the left and right side frames 26. Therefore, the board main body 40 can be assembled from the vehicle front side of the seat back frame 14 (see FIG. 3). The cross-sectional shape of the locking portion 42 is U-shaped with the vehicle rear side open. The locking portion 42 is used to lock the outer peripheral portion of the cover 20 described later, and has a function of reinforcing the plate-like board body 40 and increasing the surface rigidity of the entire backboard portion 36. Yes.

  The back spring portion 38 includes a lower back spring portion 44 that is integrally formed on the lower side of the back board portion 36, and an upper back spring portion 46 that is integrally formed on the upper side of the back board portion 36. The upper back spring portion 46 is independently provided at a position separated from the lower back spring portion 44 by a predetermined distance in the seat back height direction.

  The lower back spring portion 44 includes three lower back spring main body portions 48 arranged in parallel in three upper and lower stages in the seat back height direction, and both end portions of these three lower back spring main body portions 48 in the seat width direction. Are connected to the backboard portion 36 and fixed to the side frame 26, and the lower connection fixing portion 50 is connected to the seatback height direction. It should be noted that the number of the lower back spring body portions 48 that constitute the lower back spring portion 44 is arbitrary, and can be changed as appropriate in relation to the required cushion performance. Therefore, the upper and lower widths of the lower back spring portion may be widened to one, or conversely, two or four or more.

  The flat cross-sectional shape of the lower back spring main body 48 is formed in a wave shape, and the wave portion (flexible portion) 48A is extended by the load applied to the back board portion 36 side (the vehicle rear side). It is configured to bend and deform (elastically deform) toward the backboard portion 36 which is the direction of action. In addition, in the vicinity of both end portions 48B in the seat width direction of the lower back spring body portion 48 of the upper and middle stages, a vertically oriented resin claw portion 58 to be described later for attaching the cover 20 is integrally formed. For the range where the claw portion 58 is formed, the wave-like portion 48A is not formed.

  As shown in FIGS. 3 and 4, the above-described backboard portion 36 is disposed at a position separated by a predetermined distance on the vehicle rear side of the lower back spring portion 44. That is, a predetermined gap 52 is formed between the lower back spring portion 44 and the back board portion 36. The lower back spring body 48 can be elastically deformed within the gap 52. That is, the backboard portion 36 also functions as a limiting member that limits the amount of bending of the lower back spring portion 44 to a predetermined amount or less.

  As shown in FIG. 3, the lower connecting and fixing portion 50 is formed in a substantially inverted U shape in a plan view, and the inner side wall to which the longitudinal end 48 </ b> B of the lower back spring main body 48 is connected. 50A, an outer side wall 50B that is disposed in opposition to the inner side wall 50A in the seat width direction and is locked in contact with the outer side surface of the side wall portion 26A of the side frame 26, and a front end of the inner side wall 50A A front wall 50C connected to the front end of the outer side wall 50B in the vehicle width direction and locked to the front wall portion 26B of the side frame 26 in a surface contact state.

  Both end portions 48B in the seat width direction of the lower back spring body portion 48 in the upper and lower stages described above are configured as flat portions where the wave-like portions 48A are not formed, and are connected to each other by a pair of left and right lower connection fixing portions 50. Has been. That is, the lower back spring main body 48 is provided in a plurality of stages in the seat back height direction, but both end portions 48B of the lower back spring main body 48 in the seat width direction are connected by the pair of left and right lower connection fixing portions 50. As a result, the lower back spring portion 44 is integrated with the back board portion 36. In addition, the longitudinal dimension of the lower connection fixing portion 50 is set so as to include a range from the upper edge of the uppermost lower back spring body portion 48 to the lower edge of the lowermost lower back spring body portion 48. Yes.

  The lower connection fixing portion 50 is fixed to the side frame 26 by fixing the outer side wall 50B from the outer side in the seat width direction by a fixing means (not shown) to the mounting hole 32 of the side wall portion 26A of the side frame 26. . As fixing means, a structure in which a resin clip is integrally formed on the outer side wall 50B and engaged with the mounting hole 32, a structure in which a rivet, a screw, a screw or a bolt and a fastener such as a weld nut are fastened, and a structure Various aspects, such as a structure of bonding with an adhesive, can be applied.

  The upper back spring portion 46 is basically configured in the same manner as the lower back spring portion 44, and includes an upper back spring main body portion 54 and an upper connection fixing portion 56 described later. The upper back spring main body portion 54 is formed with a wave-like portion 54A so as to expand and bend and deform (elastically deform) when a load is applied to the backboard portion 36 (vehicle rear side). Further, the longitudinal resin claws 58 are integrally formed at both ends 54B in the sheet width direction of the upper back spring main body 54, and the lateral resin claws 60 are formed at both ends 54B and the center in the sheet width direction. It is integrally formed.

  Further, in the present embodiment, the upper back spring portion 46 is configured by one stage (one), but is not limited thereto, and may be configured by a plurality of stages (a plurality of stages) such as two stages.

<Configuration of the seat back pad 18>
As shown in FIG. 1, the seat back pad 18 is roughly composed of a pad center upper part 62, a pad center lower part 64, and a pair of left and right pad side parts 66. The seat back pad 18 is made of urethane foam or the like.

  As shown in FIG. 5, the vertical cross-sectional shape of the pad center upper part 62 is formed in a substantially J shape that is upside down and left and right. The pad center upper part 62 is locked to the upper frame 28 of the seat back frame 14 from above the seat back. The vertical cross-sectional shape of the pad center lower portion 64 is formed in a substantially J shape that is opposite to the left and right. The pad center lower part 64 has a shape in which the lower part swells in a convex curve shape from the upper part to the vehicle front side. The pad center lower portion 64 is locked from the lower side of the seat back to a connecting rod 68 that connects the lower ends of the side frames 26 in the seat width direction. The connecting rod 68 is disposed in parallel to the front side of the lower frame 30 of the seat back frame 14.

  Further, as shown in FIG. 3, the cross-sectional shape of the pad side portion 66 is formed in a substantially C shape. The pad side portion 66 is attached so as to be wound around the side frame 26 in a state where the lower connection fixing portion 50 is attached. The pad side portion 66 has a shape in which the lower portion bulges in a convex curved shape from the upper portion toward the front side of the vehicle, and bulges further toward the front side of the vehicle than the pad central upper portion 62 and the pad central lower portion 64. It has a shape that secures the side support performance.

  Returning to FIG. 5, the seat back board 16 described above is disposed from the back side lower end 62 </ b> A of the pad center upper part 62 to the back side upper end part 64 </ b> A of the pad center lower part 64 in the longitudinal sectional view. Precisely, the back side upper end portion 64A of the pad center lower portion 64 is formed thinner than the back side lower end portion 62A, and the lower end portion of the backboard portion 36 is disposed so as to overlap in the thinned portion. .

  Further, a lateral slit 70 as a through groove for hanging the cover is formed between the pad center upper part 62 and the pad center lower part 64 described above. Further, between the pad center upper part 62, the pad center lower part 64, and the pad side part 66, vertical slits 72 are formed as through grooves for hanging a pair of left and right covers. The slit width of the horizontal slit 70 and the vertical slit 72 is set to a length that allows the vertical mounting member 22 and the horizontal mounting member 24 to be described later to be inserted. Further, both the horizontal slit 70 and the vertical slit 72 are formed in a straight line, and penetrate the seat back pad 18 in the thickness direction (also in the vehicle front-rear direction).

<Configuration of cover 20>
As shown in FIG. 1, the cover 20 is formed in a size that can cover the seat back pad 18 from the front side. Further, the cover 20 includes a cover center upper portion 74, a cover center lower portion 76, and a pair of left and right cover side portions 78 in accordance with the divided configuration of the seat back pad 18.

<Mounting structure of cover 20>
The cover 20 is attached by means of a vertical mounting member 22, a horizontal mounting member 24, a vertical resin claw portion 58, a horizontal resin claw portion 60, an outer peripheral locking portion 80, and the like.

  As shown in FIG. 1, the vertical mounting member 22 includes a belt-shaped mounting member main body 22A, and a resin engaging portion formed on one side edge of the mounting member main body 22A and formed in a wedge shape. 22B. The other side edge of the attachment member main body 22A is attached in advance to the cover center upper portion 74, the cover center lower portion 76, and the cover side portion 78 by sewing. In FIG. 1, the vertical mounting member 22 (and the horizontal mounting member 24) is drawn separately from the cover 20, but the vertical mounting member 22 (and the horizontal mounting member 24) is attached to the cover 20 in advance. It has been. Correspondingly, longitudinal resin claws 58 are integrally formed on both outer sides of the back spring body 48 in the sheet width direction with respect to the corrugated portion 48A. The engaging portion 22 </ b> B of the vertical mounting member 22 can be elastically engaged with the vertical resin claw portion 58. Then, by engaging the engaging portions 22B of the pair of left and right vertical mounting members 22 with the corresponding vertical resin claws 58 of the respective back spring main body portions 48, the central portion of the cover 20 is seated in the vertical direction. Attached to the backboard 16.

  Similarly, the lateral mounting member 24 is configured by a mounting member main body 24A formed in a band shape, and a resin engaging portion 24B formed on one side edge of the mounting member main body 24A and formed in a wedge shape. Has been. The other side edge of the attachment member main body 24A is attached in advance to the cover center upper part 74 and the cover center lower part 76 by sewing. Correspondingly, the back spring main body portion 48 arranged at the uppermost stage is integrally formed with a lateral resin claw portion 60 at a central portion in the sheet width direction and at two locations on both outer sides. The engaging portion 24 </ b> B of the lateral mounting member 24 can be elastically engaged with the lateral resin claw portion 60. Then, as shown in FIG. 4, the engaging portions 24B of the lateral mounting members 24 provided at three locations are elastically engaged with the lateral resin claws 60 of the back spring main body portion 48 arranged at the uppermost stage. By doing so, the center portion of the cover 20 is attached to the seat back board 16 in the lateral direction.

  Further, an outer peripheral locking portion 80 having a hook shape is attached to an appropriate position of the outer peripheral portion of the cover 20 by sewing. The outer peripheral locking portion 80 is inserted and locked to the locking portion 42 of the backboard portion 36 from the vehicle rear side. Thereby, the outer peripheral part of the cover 20 is detachably locked to the backboard part 36.

<Main part configuration of this embodiment>
Here, as shown in FIGS. 1 and 4, a pair of left and right upper connection fixing portions 56 are integrally formed at both end portions 54 </ b> B in the seat width direction of the upper back spring main body portion 54 described above. The pair of left and right upper connecting and fixing portions 56 are set to have a longitudinal dimension that fits between the side wall portions 26 </ b> A of the left and right side frames 26 including the upper back spring main body portion 54.

  Further, the upper connecting and fixing portion 56 projects outward in the seat back width direction and is formed in a step shape in a plan view. Specifically, the upper connection fixing portion 56 includes an extension portion 56A that extends from the both ends 54B in the seat width direction of the upper back spring main body portion 54 to the outside in the seat width direction, and a sheet from the tip portion of the extension portion 56A. The intermediate portion 56B is bent obliquely toward the back rear side, and the fixing portion 56C is bent outward from the front end portion of the intermediate portion 56B in the seat width direction.

  The extension portion 56 </ b> A is a portion that plays a role of approaching the side frame 26 in order to connect the upper back spring main body portion 54 to the side frame 26. Further, the intermediate portion 56B is a portion that plays a role of connecting the distal end portion of the extension portion 56A to the rear wall portion 26C serving as a fixing portion to the side frame 26. Due to the presence of the intermediate portion 56B, an offset amount to the rear side of the seat back with respect to a position where the lower back spring main body 48 is fixed to the side frame 26 can be obtained (adjustable). Furthermore, the fixing portion 56 </ b> C is a portion that plays a role of fixing the end portion 54 </ b> B in the seat width direction of the upper back spring main body portion 54 to the rear wall portion 26 </ b> C of the side frame 26. The fixing portion 56C is fixed to the mounting hole 34 of the rear wall portion 26C by fixing means (not shown) from the front side of the seat back, whereby the upper connection fixing portion 56 is fixed to the side frame 26. As fixing means, a structure in which a resin clip is integrally formed on the fixing portion 56C and engaged with the mounting hole 34, a structure in which a rivet, a screw, a screw or a bolt and a fastener such as a weld nut are fastened, and a structure are used. Various aspects, such as a structure of bonding with an adhesive, can be applied.

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

  The vehicle seat 10 having the above configuration includes the seat back board 16 in which a resin back spring part 38 is integrally formed with a resin back board part 36. Then, the seat back board 16 is fitted to the metal seat back frame 14 from the front side of the vehicle. Specifically, the left and right lower connection fixing portions 50 are fitted to the left and right side frames 26 from the front side of the vehicle, and are fixed to the side frames 26 from the outside in the seat width direction in this state. Further, the left and right upper connecting and fixing portions 56 are inserted into the left and right side frames 26 from the front side of the vehicle and then fixed to the left and right rear wall portions 26C from the front side of the vehicle. Thereafter, the seat back pad 18 is mounted on the seat back frame 14 from the front side of the vehicle, and the cover 20 is further put on the seat back pad 18. A vertical mounting member 22 and a horizontal mounting member 24 are fixed in advance to the cover 20 by sewing, and the vertical mounting member 22 and the horizontal mounting member 24 correspond to the vertical mounting member 22 while covering the seat back pad 18 with the cover 20. It inserts in the direction slit 72 and the horizontal direction slit 70, and is made to latch to the vertical resin claw part 58 and the horizontal resin claw part 60, respectively. Further, the outer peripheral locking portion 80 of the cover 20 is locked to the locking portion 42 of the backboard portion 36.

  The seat back 12 assembled as described above is a vehicle seat 10 to which a seat cushion 11 and a headrest (not shown) are attached. When the occupant sits on the vehicle seat 10, a load on the rear side of the seat back is input to the back spring portion 38 via the cover 20 and the seat back pad 18. For this reason, the lower back spring main body 48 and the upper back spring main body 54 are bent and deformed to the rear side of the seat back, which is the load acting direction. Further, since the load at this time is transmitted to the left and right side frames 26 from the lower connection fixing portion 50 and the upper connection fixing portion 56, a reaction force from the side frame 26 to the vehicle front side is generated.

  Thus, when a load is input from the occupant to the back spring portion 38, the load is deformed and contributes to securing the cushioning property of the seat back 12, and the load itself is transmitted to the left and right side frames 26 to be transmitted to the left and right side frames. 26. As a result, the cushion performance of the seat back 12 is sufficiently ensured. Further, since the back spring portion 38 is made of resin and is provided integrally with the back board portion 36, the number of parts and the number of assembling steps are reduced as compared with the case where the back spring portion 38 is formed of a metal seat back spring. Is done.

  By the way, when the rear collision occurs, the occupant is pressed against the seat back 12 by inertia. At this time, the occupant chest is supported by the upper back spring body 54 provided corresponding thereto, and the occupant waist is supported by the lower back spring body 48 provided corresponding thereto.

  Here, in the present embodiment, both end portions 48B in the seat width direction of the lower back spring main body portion 48 are located at the front portion of the side frame 26 via the lower connection fixing portion 50 (that is, the front portion side of the side wall portion 26A). On the other hand, both end portions 54B of the upper back spring main body 54 in the seat width direction are fixed to the rear portion of the side frame 26 (that is, the rear wall portion 26C) via the upper connection fixing portion 56. For this reason, it is possible to delay the rise of acceleration applied to the occupant's chest at the time of a rear collision. In other words, if both end portions 54B of the upper back spring main body 54 in the seat width direction are fixed to the front portions of the pair of left and right side frames 26 in the same manner as the lower back spring main body 48, the fixed position is the structure of the present embodiment. However, the acceleration on the occupant's chest rises faster by the amount in front of the seat back. On the other hand, if the position where the upper back spring main body 54 is fixed to the side frame 26 is shifted to the rear side of the seat back as in the present embodiment, the rise of acceleration applied to the passenger chest can be delayed correspondingly. Therefore, the rise of acceleration applied to the occupant chest can be made closer to the rise of acceleration of the occupant head.

  This will be described with reference to FIG. FIG. 6 shows the behavior of the dummy D at the time of rear collision in a side view. The state of the occupant before the rear collision is indicated by a solid line and a broken line P (important is a broken line portion indicating the back of the occupant's chest) P. Assuming that the structure of the present embodiment is not applied, the fixing position of the upper back spring body 54 to the side frame 26 is the front side of the side frame 26 as in the case of the lower back spring body 48. . For this reason, the passenger's chest has entered the seat back 12 to the position indicated by the alternate long and short dash line Q. Since the occupant chest moves from this position to the front side of the seatback, the position of the alternate long and short dash line Q may be considered as the rise of acceleration applied to the occupant chest. On the other hand, in the case of this embodiment, the fixing position of the upper back spring main body 54 to the side frame 26 is set to be offset from the fixing position of the lower back spring main body 48 to the rear side of the seat back. For this reason, the passenger's chest enters the seat back 12 to the position indicated by the two-dot chain line R, that is, to a deeper position (back side of the seat back). Since the occupant chest moves from this position to the front side of the seat back, the position of the alternate long and short dash line R may be considered as the rise of acceleration applied to the occupant chest. Therefore, the difference between the rise of acceleration applied to the occupant chest and the rise of acceleration of the occupant head is reduced (in other words, the distance between the occupant head and the occupant chest is reduced), and the load on the occupant neck is reduced. Supplementally, in the event of a rear impact, the occupant's chest pressed against the seat back begins to move forward, while the occupant's head tries to maintain its state of inertia, so the occupant's head and occupant's neck A relative displacement occurs, and this relative displacement becomes a load on the occupant's neck.

  In addition, according to the present embodiment, the difference in the front-rear direction of the seat is provided at the fixing position of the upper back spring main body portion 54 and the lower back spring main body portion 48 to the side frames, so that the number of parts is specially increased. There is nothing.

  As a result, according to the vehicle seat and the seat back board according to the present embodiment, it is possible to reduce the load on the occupant's neck at the time of rear collision with a simple configuration.

  In the present embodiment, as shown in FIG. 7A, the end portion 54B of the upper back spring main body 54 in the seat width direction is not the side wall portion 26A of the side frame 26 but the rear wall by the upper connection fixing portion 56. It is fixed to the part 26C. For this reason, there is almost no extra length in the upper back spring body 54 when a load F is applied to the rear of the seat back during a rear impact. That is, as shown in FIG. 7B, an upper connection fixing portion 92 that is L-shaped in a plan view is integrally formed at the end of the upper back spring main body 90 in the seat width direction. Assume that the connection fixing portion 92 is fixed to the side wall portion 26 </ b> A of the side frame 26. In this case, when the load F to the rear side of the seat back is applied, the upper connection fixing portion 92 exhibits the following behavior. That is, the corner 92A of the upper connection fixing portion 92 is extended by being pulled toward the rear side of the vehicle. For this reason, it is expected that the spring constant of the upper back spring body 90 will deviate from the target value and the amount of deflection will increase. On the other hand, in the present embodiment, the spring constant of the upper back spring main body 54 is almost as intended, and the error is reduced. As a result, according to the present embodiment, it is possible to improve the accuracy with respect to reducing the load on the occupant's neck at the time of rear collision.

  Further, in the present embodiment, a pair of left and right lower connection fixing portions 50 are provided at both end portions 48B in the seat width direction of the lower back spring main body portion 48, and these lower connection fixing portions 50 are provided on the side frame 26. It is hung (fitted) from the front side of the seat back. For this reason, when seated, a load received from the occupant is transmitted from the lower back spring main body 48 to the side frame 26 via the pair of left and right lower connection fixing portions 50. On the other hand, at the time of a rear collision, the fixing position of the upper back spring main body 54 is offset to the rear side of the seat back relative to the fixing position of the lower back spring main body 48, so that the occupant chest (upper back) enters the seat back 12. As a result, according to the present embodiment, the load received from the occupant can be efficiently transmitted to the side frame 26 at the time of sitting, and the load on the occupant's neck can be effectively reduced during the rear impact.

  Further, a plurality of lower back spring body portions 48 are provided in the seat back height direction, and most of the load acting when the occupant is seated is distributed and received by these lower back spring body portions 48. Therefore, the load burden of each lower back spring body 48 is reduced. Further, since the occupant's waist is supported by the plurality of lower back spring bodies 48, the cushioning property at the time of sitting is improved. Therefore, the durability of the lower back spring main body 48 can be improved, and the cushioning property at the time of sitting can be improved to reduce fatigue.

  Further, a backboard portion 36 made of a resin plate material is disposed on the back side of the seat back frame 14. Since the lower back spring main body 48 is provided integrally with the back board 36 via a pair of left and right lower connecting and fixing portions 50, the back board is used as a limiting member for restricting the amount of bending of the lower back spring main body 48. The part 36 can be used. Further, when the upper body of the occupant comes into contact with the backboard portion 36 via the lower backspring portion, the load can be received also by the backboard portion 36. That is, a path for transmitting a load transmission path on the occupant waist side from the lower back spring body 46 to the side frame 26 via the pair of lower connection fixing parts 50 and a pair of lower connection fixing parts from the backboard part 36. A plurality of paths to be transmitted to the side frame 26 via 50 can be provided. Therefore, it is possible to suppress or prevent an overload from being applied to the lower back spring main body 48 made of resin, and to support the load from the occupant using the entire seat back board 16.

[Supplementary explanation of the above embodiment]
In the embodiment described above, the resin back spring part 38 is integrally formed with the resin back board part 36. However, the present invention is not limited to this, and the resin back spring part is integrally provided with the resin back spring part 38. Also good. That is, the backboard portion and the back spring portion may be manufactured separately and then integrated by welding or the like. Further, the back spring main body portion and the connecting and fixing portion constituting the back spring portion may be manufactured as separate parts and then integrated by welding or the like. In addition, in the above-described embodiment, the lower connection fixing portion 50 has been described as a component on the lower back spring portion 44 (back spring portion 38) side, but the lower connection fixing portion 50 is configured on the backboard portion 36 side. Even if it is regarded as an element, it can be interpreted in any way. This is because, in the state of the finished seat backboard, whether to include the component of the connecting and fixing part on the back spring part side or on the backboard part side is just a matter of how to classify. is there.

  Further, in the present embodiment, the rear wall portion 26C of the side frame 26 is formed by using the pair of left and right upper connecting and fixing portions 56 having a stepped shape in plan view in the both end portions 54B in the seat width direction of the upper back spring main body portion 54. However, the present invention is not limited to this, and various shapes can be adopted. For example, when the position of the rear wall portion 26C of the side frame 26 and the upper back spring main body portion 54 in the seat front-rear direction is not shifted, the both end portions 54B of the upper back spring main body portion 54 in the seat width direction are directly outside the seat width direction. It may be extended to be fixed to the rear wall portion 26 </ b> C of the side frame 26.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat back 14 Seat back frame 16 Seat back board 18 Seat back pad 20 Cover 26 Side frame 26A Side wall part (front part of side frame, side part)
26B Rear wall (rear side frame, rear flange)
36 Backboard 48 Lower back spring body (back spring body)
48B Both ends 50 Lower connection fixing part (Lower fixing part)
54 Upper back spring body (back spring body)
54B Both ends 56 Upper connection fixing part (upper fixing part)

Claims (6)

A seat back frame having a pair of left and right side frames;
A plurality of rails arranged along the seat width direction between the pair of left and right side frames and provided in the seat back height direction, and flexed and deformed in the load acting direction when a load is applied to the seat back rear side. The back spring body,
A seat back pad disposed on the front side of the back spring body,
A cover covering the surface of the seat back pad;
Have
Further, both end portions in the seat width direction of the upper back spring body portion provided corresponding to the occupant chest among the plurality of back spring body portions are supported by rear portions of the pair of left and right side frames,
And both ends in the seat width direction of the lower back spring main body provided corresponding to the occupant's waist of the plurality of back spring main bodies are supported by the front of the pair of left and right side frames.
Vehicle seat. The side frame extends in the front-rear direction of the seat in a plan view and is bent inward in the seat width direction from the side portion including the front portion of the side frame and the rear end portion of the side frame. A rear flange portion including the rear portion, and
Furthermore, the end portion in the seat width direction of the upper back spring main body is fixed to the rear flange portion via the upper fixing portion.
The vehicle seat according to claim 1. The lower back spring main body is made of resin,
At both ends in the seat width direction of the lower back spring main body, a pair of left and right lower fixing portions that are disposed in front of the seat back of the side frame and are fixed to the side frame are integrally or integrally provided. Yes,
The vehicle seat according to claim 1, wherein the vehicle seat is a vehicle seat. A plurality of the lower back spring main body portions are provided in the seat back height direction,
Furthermore, both end portions in the seat width direction of the plurality of lower back spring main body portions are connected in the seat back height direction by the pair of left and right lower fixing portions.
The vehicle seat according to claim 3. The lower back spring main body portion is formed of a resin plate material via the pair of left and right lower fixing portions, and is provided integrally or integrally with a backboard portion disposed on the back side of the seat back frame. Yes,
The vehicle seat according to claim 3 or claim 4, wherein A backboard portion formed of a resin plate and disposed on the back side of the seat back frame;
Between the pair of left and right side frames provided in the seat back frame, a plurality of them are provided along the seat width direction and provided in the seat back height direction. A plurality of back spring body portions that bend and deform,
Both end portions in the seat width direction of the upper back spring main body portion provided corresponding to the occupant chest of the plurality of back spring main body portions are supported by rear portions of the pair of left and right side frames, and Both end portions in the seat width direction of the resin-made lower back spring body portion provided corresponding to the occupant waist portion of the back spring body portion are supported by the front portions of the pair of left and right side frames,
Furthermore, a pair of left and right lower fixing portions disposed in front of the seat back of the side frame and fixed to the side frame are integrally or integrally provided at both ends of the lower back spring main body in the seat width direction. As well as
In the backboard part, at least the lower back spring body part is integrally or integrally provided via the pair of left and right lower fixing parts.
A seat backboard characterized by that.

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