JP2013091360A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which can reduce an operation load in reclining the seat and suppress abnormal noise, and can suppress costs.SOLUTION: A resin seat backboard 16 is fitted from a front seat side to be secured in right and left side frames of a seat back frame 14. An elongate cover 120 is bridged over between lower ends of right and left lower side connection parts. The cover 120 is disposed apart at the front seat side of a reclining rod 68 in an assembled state. Moreover, the rear side of the lower end of a seat back pad 18 is brought into contact with the front surface of the cover 120.

Description

  The present invention relates to a vehicle seat.

  The following Patent Document 1 discloses a vehicle seat having a seat back provided with a planar elastic body having four sides supported by a rectangular frame. The back side of the lower side of the frame is formed in a gently curved concave shape. The receiving part formed in this concave shape is arranged to face the seat front side of the reclining rod. When the occupant is not seated on the seat, the receiving portion is arranged away from the reclining rod, and when the occupant is seated and a load is applied to the planar elastic body, the receiving portion abuts on the reclining rod. Prevents damage to the frame. Further, a cushioning material made of felt or the like is attached to the front side of the reclining rod. Thereby, it is set as the structure which suppresses generation | occurrence | production of the abnormal noise which arises when the lower side of a frame body contact | abuts directly to a reclining rod.

JP 2010-184521 A

  However, in the case of the above prior art, since it is a so-called special vehicle seat that supports the back surface of the seated occupant with a planar elastic body having four sides supported by the frame, it is for a general vehicle equipped with a seat back pad. It cannot be applied to sheets. Here, in the case of a general vehicle seat, the left and right recliners are connected by a reclining rod. When the seat back is tilted or returned, the seat back pad rotates around the reclining rod. On the other hand, the reclining rod rotates around the axis at a rotational speed different from that of the seat back pad via the planetary gear mechanism. For this reason, a rotational speed difference is generated between the reclining rod and the seat back pad, and a frictional resistance is generated between them. As a result, the operation load of the reclining operation lever increases. Therefore, conventionally, a resin cover having a C-shaped cross section is rotatably mounted on the outer peripheral surface of the reclining rod so as to reduce the frictional resistance between the seat back pad and the reclining rod. . For this reason, the resin cover is required as a separate and independent part, leading to an increase in cost.

  An object of the present invention is to obtain a vehicle seat that can reduce the operation load at the time of reclining and suppress the generation of abnormal noise and can reduce the cost in consideration of the above facts.

  A vehicle seat according to a first aspect of the present invention includes a seat back frame including a pair of side frames disposed on both sides in the seat width direction and supported rotatably about a reclining rod, and an elastic material A seat back pad supported by the seat back frame, a seat constituent member made of a resin material and spanned between the pair of side frames, and an integral or integral part of the seat constituent member And a resin cover portion that is interposed between the reclining rod and the back surface of the seat back pad and that is spaced apart from the reclining rod toward the seat front side. .

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the seat component includes a backboard portion disposed on a back side of the seat back frame and the pair of side frames. Arranged along the seat width direction and on the back side of the seat back pad, and a spring part that elastically deforms to the back board side when a load acts on the rear side of the seat through the seat back pad, and A pair of connecting and fixing portions that connect both side portions of the backboard portion and both side portions of the spring portion and are fixed to the pair of side frames, respectively, and the cover portion is below the seat of the spring portion It is spaced apart on the side.

  A vehicle seat according to a third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the cover portion has a C-shaped longitudinal cross-sectional shape and is formed on the surface of the seat back pad. Is covered with a cover, and the lower end portion side of the cover is attached to the seat constituent member on the back side of the seat back through the lower side from the front side of the seat back pad.

  The vehicle seat according to a fourth aspect of the present invention is the vehicle seat according to any one of the first to third aspects, wherein the front surface of the cover portion is subjected to a texture.

  According to the first aspect of the present invention, the resin cover portion is integrally or integrally provided on the sheet constituent member. Further, the cover portion is interposed between the reclining rod and the back surface of the seat back pad, and is disposed away from the reclining rod toward the seat front side. For this reason, even if an occupant sits on the vehicle seat and a load acts on the seat back pad, the seat back pad does not directly hit the reclining rod, and a cover portion is interposed between the two. Therefore, if the cover portion is pushed away from the reclining rod even if the cover portion is pushed rearward through the seat back pad, the sliding resistance between the seat back pad and the reclining rod via the cover portion is maintained. Does not occur. Therefore, when the seat back is reclined, the operation load of the recliner operation lever is not increased at all, and no abnormal noise is generated.

  On the other hand, even if the cover part bends in the load acting direction and contacts the reclining rod, the cover part only slides on the outer peripheral surface of the reclining rod, and the seat back pad slides directly on the outer peripheral surface of the reclining rod Never do. Therefore, sliding resistance and abnormal noise are sufficiently suppressed by appropriately selecting the material of the cover part.

  Furthermore, since the cover part is integrally or integrally provided with the seat constituent member, the number of parts is reduced as compared with the case where the cover part is a separate and independent part.

  According to the second aspect of the present invention, since the seat constituent member has the backboard portion, the spring portion, and the pair of connecting and fixing portions, the weight is reduced as compared with the case where the metal S spring is used. At the same time, the assembly man-hours are reduced. Furthermore, in the present invention, the cover portion is disposed so as to be separated from the spring lower portion of the seat. For this reason, it is possible to fix the pair of connecting and fixing portions to the side frames and to assemble the seat constituent member to the seat back frame, and at the same time to arrange the cover portion apart from the seat front side of the reclining rod. It becomes possible.

  According to the third aspect of the present invention, in the state where the cover is put on the surface of the seat back pad, the lower end portion side of the cover passes through the lower side from the front side of the seat back pad and the seat structure is formed on the back side of the seat back. It is attached to the member. In this case, when the lower end portion of the cover is pulled to the back side of the seat back, the lower end portion of the seat back pad is pushed to the reclining rod side. Intervening in between. Therefore, when the cover is attached to the seat component, the seat back pad does not directly hit the reclining rod.

  According to the fourth aspect of the present invention, since the front surface of the cover portion is subjected to the texture processing, the contact area of the front surface of the cover portion with the back surface of the seat back pad can be reduced. Accordingly, the frictional resistance is reduced correspondingly, and the rubbing noise (abnormal noise) is suppressed. In addition, the manufacturing is easy because of the method of applying the texture.

  As described above, the vehicle seat according to the first aspect of the present invention can reduce the operation load at the time of reclining, suppress the generation of abnormal noise, and can further reduce the cost. It has the effect.

  The vehicle seat according to the second aspect of the present invention has an excellent effect that it is possible to reduce the cost and weight by reducing the number of assembling steps and to improve the assembly workability.

  The vehicle seat according to the third aspect of the present invention has an excellent effect that the seat back pad can be prevented from directly hitting the reclining rod when the cover is attached to the seat constituent member.

  The vehicle seat according to the fourth aspect of the present invention has an excellent effect that it is possible to effectively suppress the occurrence of abnormal noise generated between the cover portion and the seat back pad at a low cost.

It is a disassembled perspective view of the seat back of the vehicle seat which concerns on 1st 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 view (an enlarged plan view along line 3-3 in FIG. 2) showing an enlarged state of the seat back shown in FIG. 1. (A) is an enlarged vertical sectional view showing the assembled state of the seat back shown in FIG. 1, (B) is an enlarged view of the main part of (A). It is a perspective view corresponding to FIG. 2 which shows the state by which the resin spring integrated backboard which concerns on 2nd Embodiment was assembled | attached to the seat back frame.

[First Embodiment]
Hereinafter, a first embodiment of a seat back according to the present invention and a vehicle seat using the same 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. 4A shows a longitudinal sectional view of a vehicle seat provided with the seat back. As shown in these drawings, the vehicle seat 10 includes a seat cushion 11 (see FIG. 4A) on which an occupant is seated, and a seat back 12 that is tiltably supported at the rear end portion of the seat cushion 11. The headrest (not shown) is supported by the upper end of the seat back 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 seat constituent member that is assembled to the seat back frame 14 from the front side of the seat. A resin spring integrated backboard (hereinafter simply referred to as “seat backboard”) 16 and a cushion material for the seat back 12 are configured and disposed on the front side of the seat back board 16 and supported by the seat back frame 14. The seat back pad 18, a cover (skin) 20 that mainly covers the surface of the seat back pad 18, and a vertical mounting member 22 and a horizontal mounting member 24 for mounting the cover 20 to the seat back board 16 are configured. Yes. Hereinafter, each component will be described in detail.

<Configuration of the seat back frame 14>
As shown in FIGS. 1 to 4A, the seat back frame 14 indicates a front view of the vehicle (when viewed from the front of the vehicle. Hereinafter, the direction of the vehicle and the direction of the vehicle seat 10 are the same. In the following description, it is formed in a rectangular frame shape. 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 The lower panel 30 connects the 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 and 3, the side frame 26 includes a side wall portion 26A, a front wall portion 26B, and a rear wall portion 26C. When viewed alone, the side frame 26 is substantially L-shaped in a plan view. 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 4B, the seat back board 16 is made of a resin plate and is made of a resin and a back board portion 36 disposed on the back side of the seat back frame 14. It is provided integrally with the backboard portion 36 and is bridged so as to be directly supported by the pair of left and right side frames 26. Further, when a load is applied to the rear side of the seat back, it is bent in the load acting direction (the rear side of the vehicle). And a back spring portion 38 formed to be deformable.

  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 the seat width direction (longitudinal direction) of the three lower back spring main body portions 48. ) And the lower connection fixing portion 50 which is connected to the backboard portion 36 and is fixed to the side frame 26. The lower back spring main body 48 corresponds to the “spring portion” in the present invention, and the left and right lower connection fixing portions 50 correspond to the “connection fixing portion” in the present invention. In addition, the number of the lower back spring body portions 48 that constitute the lower back spring portion 44 is arbitrary, and may 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 portion 48 is formed in a wave shape, and the wave portion 48A extends due to the load applied to the backboard portion 36 side (the vehicle rear side), and this is the direction of load application. It is configured to bend and deform (elastically deform) toward the backboard portion 36 side. 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 FIG. 3, 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.

  The lower connection fixing portion 50 is formed in a substantially inverted U shape in plan view, and has an inner side wall 50A to which an end portion 48B in the seat width direction of the lower back spring main body portion 48 is connected, and the inner side wall 50A. Are connected in parallel to the outer side wall 50B of the side wall portion 26A of the side frame 26 in a surface contact state, and the front end of the inner side wall 50A and the front end of the outer side wall 50B are connected in the vehicle width direction. A front wall 50C supported in a state of partial surface contact with the front wall portion 26B of the side frame 26, and a seat width direction end portion 48B of the lower back spring main body portion 48 from the rear end portion of the inner side wall 50A. And a rear wall 50D coupled to the backboard portion 36.

  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. In other words, 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. In a state where the lower connection fixing portion 50 is fixed to the side frame 26, the rear wall 50 </ b> D is disposed in parallel to the rear wall portion 26 </ b> C of the side frame 26. As a result, the end 48B of the lower back spring main body 48 in the seat width direction is arranged in a state of entering the inside of the cross section of the side frame 26.

  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. 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 end portions 54B in the sheet width direction of the upper back spring main body 54, and the lateral resin claws 60 are disposed at both end portions 54B and the central portion 54C in the sheet width direction. Are integrally formed. Further, as shown in FIG. 1, the upper connecting and fixing portion 56 has a shape protruding outward in the seat width direction, and is a longitudinal length that fits between the side wall portions 26 </ b> A of the left and right side frames 26 described above. The direction dimension is set. The upper connection fixing portion 56 is fixed to the side frame 26 by fixing the upper connection fixing portion 56 in the mounting hole 34 of the rear wall portion 26C in the seat front-rear direction by a fixing means (not shown).

  In the present embodiment, as described above, the back spring portion 38 is divided into the lower back spring portion 44 and the upper back spring portion 46. However, the present invention is not limited to this, and the two may be connected and integrated. That is, a configuration may be adopted in which the lower connection fixing portion 50 is extended to the upper side of the seat back and connected to both ends of the upper back spring main body portion 54 in the seat width direction.

  Further, in the present embodiment, the upper back spring portion 46 is configured in one step (one), but is not limited thereto, and may be configured in a plurality of steps (a plurality), and extends from the upper portion to the lower portion of the back board portion 36. Alternatively, a configuration in which a plurality of (a plurality of) back spring portions are provided at equal intervals may be employed.

<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. 4 (A), the vertical cross-sectional shape of the pad center upper part 62 is formed in a substantially J-shape that is upside down and leftward and rightward. 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 engaged with a reclining rod 68 that connects the lower ends of the side frames 26 in the seat width direction from the lower side of the seat back. The reclining rod 68 is disposed in parallel to the front side of the lower panel 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. 4A, 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 entirely attached by the vertical mounting member 22, the horizontal mounting member 24, the vertical resin claw portion 58, the horizontal resin claw portion 60, the 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 lower back spring main body 48 and the upper back spring main body 54B in the sheet width direction more than 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 longitudinal resin claws 58 of the lower back spring main body 48 and the upper back spring main body 54, the cover 20 Is attached to the seat back board 16 in the vertical direction.

  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, a lateral resin claw portion 60 is integrally formed in the upper back spring main body portion 54 at the central portion in the seat 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. 4A, 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 upper back spring main body 54. Thus, the central 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.

<Lower mounting structure of the cover 20>
Next, the lower mounting structure of the cover 20 will be described. As shown in FIGS. 4A and 4B, a plurality of elongated holes 102 elongated along the seat width direction are formed at the lower end portion of the board body 40 in the backboard portion 36 of the seatback board 16 described above. Is formed.

  On the other hand, as shown in FIG. 4B, a lower belt 104 is sewn at the lower end portion of the cover center lower portion 76 described above. The lower belt 104 is formed in a belt shape and is disposed adjacent to the lower end portion of the cover center lower portion 76 so that the sheet width direction is the longitudinal direction. The lower end 104A of the lower belt 104 is sewn to the lower end of the cover center lower portion 76, and the upper end portion 104B of the lower belt 104 has a base end portion of a resin hook 106 formed in a J shape in a side view. 106A is attached by sewing. The hook 106 is formed in a long shape along the sheet width direction, and its longitudinal dimension is set slightly shorter than the longitudinal dimension of the long hole 102. Further, the tip end portion 106B of the hook 106 is inserted into the elongated hole 102 from the seat rear side of the board main body 40 and is locked to the peripheral edge portion 108. As a result, the lower end side of the cover center portion 76 is attached to the seat back board 16 in a state of being pulled from the front side of the seat back pad 18 to the back side of the seat back 12 through the lower side.

  A carpet 110 that covers the lower end of the seat back 12 from the rear side of the seat is disposed at the lower end of the board body 40. The carpet 110 includes an extending portion 110A that extends upward from the sheet, and a folded portion 110B that is folded back from the upper end of the extending portion 110A toward the lower side of the sheet. The folded portion 110 </ b> B is fixed to the upper side of the long hole 102 of the board body 40 using a clip 112 and a spacer 114. Further, the lower end portion of the extending portion 110 </ b> A is locked below the seat cushion 11.

<Configuration of cover unit 120>
Here, the structure of the cover part 120 which concerns on the principal part of this embodiment is demonstrated in detail. As shown in FIGS. 1, 2, and 4 (B), the cover portion 120 is formed integrally with the seat back board 16. Moreover, the cover part 120 is formed in the elongate shape, and the cross-sectional shape when cut | disconnected in the direction orthogonal to a longitudinal direction is made into substantially C shape. Moreover, the cover part 120 is spanned along the sheet | seat width direction between 50 A of inner wall parts of the lower side connection fixing | fixed part 50 of right and left. More specifically, the cover portion 120 is reclining in a state below the seat of the lower back spring main body portion 48 disposed at the lowermost stage and in an assembled state to the seat back frame 14 as shown in FIG. The rod 68 is disposed at a position on the front side of the seat. Thereby, in a state where the seat back board 16 is assembled to the seat back frame 14, the back surface of the pad center lower portion 64 of the seat back pad 18 is in contact with the surface of the cover portion 120. On the other hand, the cover part 120 is spaced apart from the reclining rod 68 toward the front side of the seat and is disposed in a non-contact state. Therefore, a predetermined gap 122 is formed between the cover part 120 and the reclining rod 68.

  Further, as shown in FIGS. 1 and 2, notches 124 are respectively formed on the lower end portions of the pair of left and right lower connection fixing portions 50. This notch 124 is set in a region on the rear side of the seat with respect to the cover portion 120 so as to avoid interference with the reclining rod 68 when the seat back board 16 is assembled to the seat back frame 14 from the front side of the seat. It has become. For the same reason, as shown in FIG. 4B, the lower end 40A of the board body 40 is disposed offset from the upper end of the reclining rod 68 by a predetermined distance to the upper side of the seat.

  In addition, although the cover part 120 mentioned above is integrally formed between the lower end parts of the left and right lower connection fixing | fixed part 50, it is not restricted to this, The cover part 120 is separated from the left and right lower connection fixing | fixed part 50. And may be integrated with the left and right lower connection fixing portions 50 by heat welding or the like.

(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 in this state, the outer side walls 50B of the lower connection fixing portions 50 are seated to the side frames 26 in the seat width. Fixed from outside in the direction. 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 engaging portion 80 of the cover 20 is engaged with the engaging portion 42 of the backboard portion 36, and the hook 106 attached to the lower belt 104 is engaged with the peripheral portion 108 of the long hole 102. Thereafter, the folded portion 110 </ b> B of the carpet 110 is attached to the board body 40 using the clip 112 and the spacer 114.

  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 from the lower connecting and fixing portion 50 to the left and right side frames 26, a reaction force from the side frames 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. As a result, according to the present embodiment, the cushion performance of the seat back 12 can be sufficiently secured, and further weight reduction and cost reduction can be achieved.

  Here, in the present embodiment, the resin cover portion 120 is integrally provided between the lower end portions of the left and right lower connection fixing portions 50 of the seat back board 16. Further, the cover portion 120 is interposed between the reclining rod 68 and the back surface of the seat back pad 18 and is disposed away from the reclining rod 68 toward the seat front side. For this reason, even if an occupant sits on the vehicle seat 10 and a load acts on the seat back pad 18, the seat back pad 18 does not directly contact the reclining rod 68, and the cover portion 120 is interposed between the two. Is done. Accordingly, if the cover 120 is pushed away from the reclining rod 68 through the seat back pad 18 and is kept away from the reclining rod 68, the seat back pad 18 and the reclining rod 68 through the cover 120 No sliding resistance occurs between the two. Therefore, when the seat back 12 is reclined, the operation load of the recliner operation lever is not increased, the recliner is not engaged properly, and no abnormal noise is generated.

  On the other hand, even if the cover portion 120 is bent in the load acting direction and comes into contact with the reclining rod 68, the cover 120 only slides on the outer peripheral surface of the reclining rod 68, and the seat back pad 18 is moved to the outer periphery of the reclining rod 68. There is no direct sliding on the surface. Therefore, by appropriately selecting the material of the cover part 120, sliding resistance and abnormal noise are sufficiently suppressed.

  Furthermore, since the cover part 120 is provided integrally with the seat back board 16, the number of parts is reduced as compared with the case where the cover part 120 is a separate and independent part.

  From the above, the vehicle seat 10 according to the present embodiment can reduce the operation load during reclining and suppress the generation of abnormal noise, and can further reduce the cost.

  In the present embodiment, since the lower back spring body 48 made of resin is integrally formed between the pair of left and right lower connecting and fixing portions 50 of the seat back board 16, it is compared with the case where a metal S spring is used. As a result, weight reduction and assembly man-hours are reduced. Further, in the present embodiment, the cover portion 120 is disposed on the lower end side of the left and right lower connection fixing portions 50 and on the lower side of the lower back spring body portion 48 disposed at the lowermost stage so as to be separated from the seat. For this reason, a pair of lower connection fixing portions 50 are fitted to the left and right side frames 26 from the front side of the seat, and the seat back board 16 is assembled to the seat back frame 14, and at the same time, the cover 120 is the reclining rod 68. Are arranged apart from the front side of the seat. As a result, according to the present embodiment, it is possible to reduce the cost and weight by reducing the number of assembling steps, and to improve the assembly workability of the vehicle seat 10.

  Further, in the present embodiment, in a state where the cover 20 is put on the surface of the seat back pad 18, the lower end portion side of the cover 20 is pulled from the front side of the seat back pad 18 to the lower side to the back side of the seat back 12. It is attached to the seat back board 16 in a state where In this case, when the lower end side of the cover 20 is pulled (pulled) toward the back side of the seat back 12, the lower end side of the seat back pad 18 is pushed toward the reclining rod 68, but the cover 120 is not attached to the seat back pad 18. Is interposed between the back surface of the lower end portion and the reclining rod 68. Therefore, according to the present embodiment, it is possible to prevent the seat back pad 18 from directly hitting the reclining rod 68 when the cover 20 is attached to the seat back board 16.

[Second Embodiment]
Next, a second embodiment of the vehicle seat according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, the second embodiment is characterized in that the front surface of the cover portion 120 is textured. In the state in which the vehicle seat 10 is configured, the pad center lower portion 64 of the seat back pad 18 comes into contact with the convex portion 130 generated by the embossing process.

(Action / Effect)
Also with the above configuration, the same effects as those of the first embodiment described above can be obtained. Furthermore, according to this embodiment, the following effects can be obtained. That is, since the front surface of the cover part 120 has been subjected to the texture processing, the back surface of the pad center lower part 64 of the seat back pad 18 mainly comes into contact with the convex part 130 of the cover part 120. Therefore, the contact area of the front surface of the cover part 120 with respect to the pad center lower part 64 can be reduced. As a result, the frictional resistance is reduced correspondingly, and the rubbing noise (abnormal noise) is suppressed. In addition, the manufacturing is easy because of the method of applying the texture. As described above, according to the present embodiment, it is possible to effectively suppress the generation of abnormal noise between the cover portion 120 and the seat back pad 18 at a low cost.

[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 back spring portion 38 side. However, even if the lower connection fixing portion 50 is regarded as a component on the backboard portion 36 side, Interpretation in such a way is not a problem. 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.

10 Vehicle Seat 12 Seat Back 14 Seat Back Frame 16 Resin Spring Integrated Back Board (Seat Back Board)
18 Seat back pad 20 Cover 26 Side frame 36 Backboard part 48 Lower back spring body (spring part)
50 Lower connection fixing part (connection fixing part)
120 Cover 122 Clearance 130 Convex

Claims (4)

A seat back frame provided with a pair of side frames disposed on both sides in the seat width direction and supported rotatably about a reclining rod;
A seat back pad made of an elastic material and supported by the seat back frame;
A sheet constituent member made of a resin material and spanned between the pair of side frames;
A resin component that is integrally or integrally provided with the seat constituent member, is interposed between the reclining rod and the back surface of the seat back pad, and is spaced apart from the reclining rod toward the seat front side. A cover part;
A vehicle seat having: The sheet component is
A backboard portion disposed on the back side of the seat back frame;
It is arranged along the seat width direction between the pair of side frames and arranged on the back side of the seat back pad, and elastically deforms to the back board side when a load on the seat rear side acts through the seat back pad A spring part to
A pair of connecting and fixing portions that connect both side portions of the backboard portion and both side portions of the spring portion and are respectively fixed to the pair of side frames;
Have
The cover part is arranged separately from the seat lower side of the spring part,
The vehicle seat according to claim 1. The cover section has a C-shaped vertical cross-sectional shape, and a cover is covered on the surface of the seat back pad.
And the lower end side of the cover is attached to the seat constituent member on the back side of the seat back through the lower side from the front side of the seat back pad,
The vehicle seat according to claim 1 or 2. The front surface of the cover part has been subjected to graining.
The vehicle seat according to any one of claims 1 to 3.