JP5708302B2 - Resin seat back spring and vehicle seat - Google Patents

Description

  The present invention relates to a resin seat back spring and a vehicle seat using the same.

  In the vehicle seat shown in Patent Document 1 below, a pair of left and right side wires for preventing deformation of both sides of the cushion material (seat back pad) are provided on the left and right sides (side frames) of the seat back frame. Welded. Also, three seat springs (so-called S springs) are spanned between the left and right side portions of the seat back frame, and both end portions of each seat spring are fixed to the left and right side portions of the seat back frame. Yes.

Japanese Utility Model Publication No. 6-44460

  However, in the vehicle seat as described above, since the pair of left and right side wires and the three seat springs are manufactured separately from the metal material, it is necessary to separately assemble these components to the seat back frame. For this reason, there is room for improvement in terms of reducing the number of man-hours for manufacturing the seat back (the number of components, the number of man-hours for assembling the components to the seat back frame, etc.).

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a resin seat back spring and a vehicle seat that can reduce the number of seat back manufacturing steps.

The resin seat back spring according to claim 1 is a resin spring portion disposed between a pair of left and right side frames in a seat back frame of a vehicle seat, and both end portions in the seat width direction of the resin spring portion. A pair of left and right supported parts that are coupled and supported on the front end sides of the pair of side frames, and extend from the pair of supported parts to the front side of the seat of the pair of side frames, and on both sides of the seat back pad And a pair of left and right side support portions that support the body, and the supported portion is formed in an open cross-sectional shape with an opening on the rear side of the seat in a plan view, and the side frame is formed on the inner side from the rear side of the seat. The side frame has a front surface facing the front side of the seat, and the side support portion is an outer portion in the seat width direction at a front end portion of the supported portion. And extending to the seat front side from the the seat width direction inside portion of the front end portion of the supported portion, the wall is provided before it is disposed opposite from the seat front side to the front face of the side frame ing.

  In the resin seat back spring according to the first aspect, the resin spring portion is disposed between the pair of left and right side frames in the seat back frame. A pair of left and right supported portions are connected to both ends of the resin spring portion in the sheet width direction, and these supported portions are supported on the front end sides of the left and right side frames. Further, a pair of left and right side support portions extend from the left and right supported portions to the front side of the seat of the left and right side frames, and both side portions of the seat back pad are supported by these side support portions. Thereby, since the deformation | transformation of the both sides of a seat back pad can be suppressed, the right-and-left hold property with respect to a passenger | crew can be made favorable. Moreover, since the resin seat back spring is integrally or integrally provided with the resin spring portion, the left and right supported portions, and the left and right side support portions, the number of man-hours for manufacturing the seat back can be reduced.

Further, the resin sheet back spring this, the inside of the supported portion of the seat rear side is formed in an open cross section which is open, the side frame is fitted. Thereby, since the supported part can be favorably supported by the side frame, the support rigidity of the side support part extended from the supported part can be improved.

Further, the resin sheet back spring this, front wall provided in the seat width direction inside portion of the front end portion of the supported portion is positioned opposite from the seat front side with respect to the front surface of the side frame. For this reason, when the load to the back side of the seat is input to the supported portion, the load can be favorably supported by the front wall contacting the front surface of the side frame. In addition, the side support portion extends from the outer portion in the seat width direction at the front end portion of the supported portion toward the seat front side. Thereby, since a side support part can be arrange | positioned in a suitable position with respect to a passenger | crew, ensuring of the cushioning property in the both sides of a seat cushion pad and ensuring of the right-and-left hold property with respect to a passenger | crew can be made compatible.

The resin seat back spring according to claim 2 is the resin seat back spring according to claim 1 , wherein the resin seat back spring is disposed on the lower side of the seat back frame and the seat skin is locked. The lower panel portion is integrally or integrally provided.

In the resin seat back spring according to claim 2 , a resin lower panel portion is integrally or integrally provided instead of the lower panel which is generally formed of a metal plate and welded to the seat back frame. Thereby, since a metal lower panel and its welding process can be abbreviate | omitted, the manufacturing man-hour of a seat back can further be reduced.

Resin seat back spring according to the invention of claim 3 is the resin seat back spring according to claim 2, the lower panel part, a locking for locking the seat skin on the lower panel portions A locking hole into which the tool is inserted is formed.

In the resin seat back spring according to claim 3 , the seat skin is locked to the lower panel portion via a locking tool (for example, a J-shaped bracket) inserted into the locking hole of the lower panel portion. . Thereby, a sheet | seat outer skin can be easily latched to a lower panel part.

The resin seat back spring according to claim 4 is the resin seat back spring according to any one of claims 1 to 3 , wherein the resin spring portion and the side support portion are the seat. It is arranged on the lower side of the back frame.

In the resin seat back spring according to claim 4 , the occupant's waist can be satisfactorily supported from the seat rear side and the seat width direction by the resin spring portion and the side support portion disposed on the lower side of the seat back frame. it can. In addition, the “lower side” described in claim 4 may be within a range in which the above-described effect can be obtained.

A vehicle seat according to a fifth aspect of the present invention is a resin seat according to any one of the first to fourth aspects, wherein the vehicle seat is supported by a seat back frame and a pair of left and right side frames in the seat back frame. A seat back spring; a seat back pad supported by the seat back frame; and a seat skin covering a surface of the seat back pad.

In the vehicle seat according to the fifth aspect , the seat back pad supported by the seat back frame is covered with the seat skin. A pair of left and right side frames in the seat back frame is provided with a resin seat back spring. Since this resin seat back spring is described in any one of claims 1 to 4 , the above-described effects can be obtained.

The vehicle seat according to a sixth aspect of the present invention is the vehicle seat according to the fifth aspect , wherein a headrest is provided above the seat back frame, and the resin seat back spring includes the headrest. The resin spring portion is disposed on the lower side of the seat back frame, and on the upper side of the seat back frame, a metal spring attached to the pair of side frames and spanned between the two is provided. Is provided.

In the vehicle seat according to claim 6 , the resin spring portion of the resin seat back spring is disposed on the lower side of the seat back frame, and the resin spring portion (resin spring) is disposed on the upper side of the seat back frame. A spring made of metal that is easy to ensure a larger amount of deflection than the above is provided. For this reason, at the time of rear collision of the vehicle, the occupant's waist is supported by the resin spring portion with a small amount of deflection, while the portion above the occupant's waist is quickly displaced rearward of the seat by the large deflection of the metal spring. be able to. Thereby, the time until the head of the occupant hits the headrest (so-called contact time) can be shortened. In addition, the “lower side” and “upper side” described in claim 6 may be within a range in which the above-described effects can be obtained.

  As described above, in the resin seat back spring and the vehicle seat according to the present invention, the number of manufacturing steps of the seat back can be reduced.

It is a disassembled perspective view of the seat back of the vehicle seat which concerns on embodiment of this invention. FIG. 2 is a perspective view showing a state in which a resin seat back spring is assembled to the seat back frame shown in FIG. 1. FIG. 3 is an enlarged plan sectional view (an enlarged plan sectional view taken along line 3-3 in FIG. 2) showing an assembled state of the seat back shown in FIG. It is a longitudinal cross-sectional view which shows the structure of the lower end side of the seat back shown by FIG.

  Hereinafter, the vehicle seat 10 according to the embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow IN indicates the inner side in the vehicle width direction. In the present embodiment, the front / rear / left / right / up / down directions of the vehicle seat 10 coincide with the front / rear, left / right / up / down directions of the vehicle.

<Overall configuration>
FIG. 1 is an exploded perspective view of a seat back 12 corresponding to the backrest of the vehicle seat 10 according to the present embodiment. In FIG. 1, the angle at which each component is viewed is slightly changed. The vehicle seat 10 includes a seat cushion (not shown) on which an occupant sits and a headrest (not shown) that supports the head of the occupant. The seat back 12 is tiltably connected to the rear end portion of the seat cushion, and the headrest is connected to the upper end portion of the seat back 12.

  As shown in FIG. 1, the seat back 12 includes a metal seat back frame 14 constituting a skeleton member of the seat back 12, a resin seat back spring 16 attached to a lower portion of the seat back frame 14, and The S spring 17 (metal spring) attached to the upper part of the seat back frame 14 and the cushion material of the seat back 12 are configured and attached from the front side of the resin seat back spring 16 and supported by the seat back frame 14. The seat back pad 18 and a trim cover (seat skin) 20 covering the seat back pad 18 are provided. Hereinafter, each component will be described in detail.

<Configuration of the seat back frame 14>
As shown in FIGS. 1 and 2, the seat back frame 14 is formed in a substantially inverted U shape when viewed from the front (when viewed from the front of the vehicle). Specifically, a pair of left and right side frames 26 arranged to face each other in the seat width direction (vehicle width direction), a substantially inverted U-shaped upper frame 28 that connects the upper ends of the left and right side frames 26, It is constituted by. The seat back 12 includes all three 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. 1 to 3, 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. Further, when viewed alone, the side frame 26 is formed in a substantially C shape with an inner side in the seat width direction opened in a plan view. The width of the side wall portion 26A becomes narrower from the lower end side toward the upper end side 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 side wall portion 26A extends obliquely from the outer end portion in the seat width direction of the front wall portion 26B toward the seat rear side and the seat width direction outer side. The rear wall portion 26C extends obliquely from the rear end portion of the side wall portion 26A toward the seat width direction inner side and the seat rear side, and is bent so that the front end side is along the sheet width direction. The width of the rear wall portion 26C is set sufficiently wider than the width of the front wall portion 26B.

<Configuration of Resin Seat Back Spring 16>
Next, the configuration of the resin seat back spring 16 will be described in detail. As shown in FIGS. 1 to 3, the resin seat back spring 16 is formed of a resin material, and includes a resin spring portion 36 disposed between lower portions of the left and right side frames 26, and a resin spring portion. 36, a pair of left and right frame mounting portions 38 (supported portions) connected to both ends in the seat width direction and supported on the front end sides of the left and right side frames 26, and the left and right sides from the front end portions of the left and right frame mounting portions 38. A pair of left and right side support portions 40 (protrusions) extending to the front side of the seat of the frame 26 and the lower portion of the left and right side frames 26 on the seat rear side of the resin spring portion 36, both ends in the seat width direction are The lower panel part 42 connected with the left and right frame attaching parts 38 is integrally provided.

  The resin spring part 36 has a plurality of (here, two) resin spring main body parts 48 extending in the sheet width direction. These resin spring main body portions 48 are arranged at intervals in the height direction of the seat back 12, and both end portions in the seat width direction (both end portions in the longitudinal direction) are integrally connected to the left and right frame attachment portions 38. Yes. Thus, the two resin spring main body portions 48 are connected in the seat back height direction by the left and right frame attachment portions 38. It should be noted that the number of resin spring main body portions 48 constituting the resin spring portion 36 is arbitrary and can be changed as appropriate in relation to the required cushion performance. Therefore, the upper and lower widths of the resin spring main body may be widened to one, or conversely, three or more.

  On both sides of the resin spring main body 48 in the sheet width direction, corrugated portions 48A as a pair of left and right bent portions are integrally formed. The “both sides in the sheet width direction of the resin spring main body 48” means a wave-like portion as a bent portion on both the left and right sides with respect to a center line passing through an intermediate point (middle point) of the resin spring main body 48 in the sheet width direction. 48A is present. As a result, when the resin spring main body 48 receives a load from the occupant P (see FIG. 3) to the rear side of the seat (lower panel 42 side), the pair of left and right corrugated portions 48A extend, and as a result, the direction of the load action The sheet is bent and deformed (elastically deformed) toward the rear side of the seat. The corrugated portion 48A of the resin spring body 48 has a tapered shape (draft angle) so that the slide mold can be removed in either of the seat back height directions when resin molding is performed using a slide mold (not shown). ) Is set.

  On the other hand, the frame mounting portion 38 is formed in an open cross-sectional shape (substantially inverted U-shape) that is open on the rear side of the seat in plan view, and connects the longitudinal ends of the resin spring main body portions 48 adjacent to each other in the vertical direction. An inner side wall 38A that is also coupled to the lower panel portion 42, and an outer side wall 38B that is disposed on the outer side of the inner side wall 38A in the seat width direction and is locked in a surface contact state with the outer side surface of the side wall portion 26A of the side frame 26. And extending from the front end of the inner side wall 38A to the outside in the seat width direction, abutting on the front surface of the front wall portion 26B of the side frame 26 in a surface contact state, and the outer end in the seat width direction via the side support portion 40 A front wall 38C connected to the front end of the outer side wall 38B. The frame attachment portion 38 has a configuration in which the side frame 26 is fitted inward from the rear side of the seat through the opening at the rear end, that is, a configuration that is attached to the side frame 26 from the front side of the seat. In addition, you may make it the structure by which the side frame 26 is fitted inside the frame attaching part 38 via another member.

  The outer side wall 38B of the frame mounting portion 38 is fixed to the side frame 26 by being fixed to the mounting hole 32 of the side wall portion 26A of the side frame 26 from the outer side in the seat width direction by a fixing means (not shown). As fixing means, a resin clip (fixing tool) is integrally formed on the outer side wall 38B and engaged with the mounting hole 32, or fastened with a fastener such as a rivet, screw, screw or bolt and a weld nut. Various aspects, such as a structure and a structure bonded with a structural adhesive, are applicable.

  On the other hand, the side support portion 40 is formed in an open cross-sectional shape (substantially inverted U-shape) that is open on the rear side of the seat in a plan view, and from the outer end in the seat width direction of the front wall 38C of the frame attachment portion 38 to the front side of the seat An inner wall 40A extended to the front side, an outer wall 40B extended from the front end of the outer side wall 38B of the frame mounting portion 38 to the front side of the seat, and the front end of the inner wall 40A and the front end of the outer wall 40B connected in the seat width direction. The wall 40C is integrally provided. That is, the side support portion 40 extends from the seat width direction outer side portion at the front end portion of the frame mounting portion 38 toward the seat front side, and the side frame 26 is disposed at the seat width direction inner side portion at the front end portion of the frame mounting portion 38. A front wall 38C is provided so as to be in contact (opposed) from the front side of the seat with respect to the front surface (surface facing the front side of the seat) of the front wall portion 26B.

  As shown in FIG. 2, the upper end side of the front wall 40C of the side support portion 40 is inclined so as to extend upward and rearward of the seat, and the upper end portion 40C1 of the front wall 40C is the front wall of the side frame 26. It is in contact with the front surface of the portion 26B. Similarly, the lower end side of the front wall 40C is inclined so as to extend downward and to the rear side of the seat, and the lower end portion 40C2 of the front wall 40C is in contact with the front surface of the front wall portion 26B of the side frame 26. . That is, the upper end portion 40C1 and the lower end portion 40C2 of the front wall 40C are disposed on the same plane as the rear surface of the front wall 38C of the frame attachment portion 38 (the contact surface with the front wall portion 26B).

  On the other hand, the lower panel portion 42 is formed in a long rectangular flat plate shape, and the longitudinal direction extends along the seat width direction between the front end portions (inner end portions) of the rear wall portions 26C of the left and right side frames 26. The plate thickness direction is arranged along the front-rear direction of the sheet. Both end portions in the seat width direction of the lower panel portion 42 are connected to the rear ends of the inner side walls 38 </ b> A in the left and right frame attachment portions 38. The length dimension along the seat width direction of the lower panel portion 42 is set to be shorter than the distance between the left and right side frames 26 as shown in FIG. Thereby, the lower panel part 42 can be assembled to the seat back frame 14 from the front side of the seat. A plurality of locking holes 44 (see FIG. 4; not shown in FIGS. 1 and 2) for locking the trim cover 20 described later are arranged in the lower end portion of the lower panel portion 42 in the sheet width direction. Has been placed.

  The above-described lower panel portion 42 is disposed at a position separated by a predetermined distance on the seat rear side of the resin spring main body portion 48 described above. That is, a predetermined gap 50 is formed between the resin spring main body portion 48 and the lower panel portion 42. The resin spring main body 48 can be elastically deformed within the range of the gap 50. That is, the lower panel portion 42 also functions as a limiting member that limits the amount of bending of the resin spring main body portion 48 to a predetermined amount or less.

<Configuration of S Spring 17>
As shown in FIGS. 1 and 2, the S spring 17 is formed of a wire-like spring material, and is stretched between the upper portions of the left and right side frames 26 along the seat width direction. The S spring 17 is formed in a wave shape by continuing a plurality of S-shaped curves in the seat width direction when viewed from the front-rear direction of the seat, and both end portions in the seat width direction are the left and right side frames 26. It is fixed to. The spring characteristics of the S spring 17 are set so that when the load from the occupant P to the rear side of the seat is applied, the S spring 17 bends more greatly to the rear side of the seat than the resin spring portion 36 described above.

<Configuration of the seat back pad 18>
As shown in FIGS. 1 and 3, the seat back pad 18 is made of a foamed material such as urethane foam, and includes a pad center portion 62 and a pair of left and right pad side portions 66. The pad center portion 62 is locked at the upper end side to the upper frame 28 of the seat back frame 14 from above the seat back, and the lower end side is a connecting rod 67 that connects the lower end portions of the side frames 26 in the seat width direction (FIG. 4). (See below) from the lower side of the seat back. The lower side of the pad center portion 62 is supported from the back side of the seat by the resin spring portion 36, and the upper side of the pad center portion 62 is supported from the back side of the seat by the S spring 17.

  As shown in FIG. 3, the pad side portion 66 has a substantially C-shaped cross section, and is mounted so as to be wound around the side frame 26. The pad side portion 66 is bulged toward the front side of the seat with respect to the pad center portion 62, and has a shape that secures left and right holdability (side support property) for the occupant. The pad side portion 66 generally has a width in the vehicle front-rear direction that increases from the upper end side toward the lower end side, and the amount of bulging toward the front side of the seat increases. Further, the left and right side support portions 40 of the resin seat back spring 16 described above are disposed in the vicinity of the center portion of the flat cross section on the lower side of the left and right pad side portions 66. The left and right side support portions 40 are disposed in front of the seat with respect to the front surface of the pad center portion 62 and support (reinforce) the left and right pad side portions 66 from the inside. Accordingly, inadvertent deformation (excessive deformation) of the left and right pad side portions 66 is suppressed.

<Configuration of trim cover 20>
As shown in FIG. 1, the trim cover 20 is formed in a bag shape that can cover the seat back pad 18. A plurality of hooks 46 (see FIG. 4) formed in a substantially J-shape with a metal material or the like are attached to appropriate positions at the lower end of the trim cover 20 by sewing or the like. These hooks 46 are inserted into the locking holes 44 of the lower panel portion 42 and hooked (locked) on the edge portions of the locking holes 44. Thereby, the lower end part of the trim cover 20 is detachably locked to the lower panel part 42.

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

  The vehicle seat 10 having the above-described configuration includes the resin seat back spring 16 in which the resin lower panel portion 42 is integrally formed with the resin spring portion 36. Then, the resin seat back spring 16 is fitted to the lower side of the metal seat back frame 14 from the front side of the seat. Specifically, the left and right frame attachment portions 38 are engaged with the left and right side frames 26 from the front side of the seat, and are fixed to the side frames 26 from the outside in the seat width direction in this state. A metal S spring 17 is attached to the upper side of the seat back frame 14. Thereafter, the seat back pad 18 is mounted on the seat back frame 14 from the front side of the seat, and the trim cover 20 is put on the seat back pad 18.

  The seat back 12 assembled as described above is attached to a seat cushion (not shown) to form a vehicle seat 10. When the occupant sits on the vehicle seat 10, a load on the rear side of the seat back is input to the resin spring portion 36 and the S spring 17 via the trim cover 20 and the seat back pad 18. For this reason, the resin spring main body 48 and the S spring 17 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 via the frame attachment portion 38, a reaction force from the side frames 26 to the front side of the seat is generated.

  Thus, when a load is input from the occupant to the resin spring portion 36 and the S spring 17, these springs are bent and deformed to contribute to securing the cushioning property of the seat back 12, and the load itself is applied to the left and right side frames 26. It is transmitted and supported by the left and right side frames 26. As a result, the cushion performance of the seat back 12 is sufficiently ensured.

  Here, in the present embodiment, a pair of left and right side support portions 40 extend from the left and right frame mounting portions 38 of the resin seat back spring 16 to the front side of the seats of the left and right side frames 26. For this reason, the side support part 40 can suppress inadvertent deformation of the pad side part 66 in the seat back pad 18. Thereby, the right-and-left hold property with respect to the passenger | crew P can be made favorable.

  In addition, since the resin seat back spring 16 is integrally provided with the resin spring portion 36 including the two resin spring main body portions 48, the left and right frame mounting portions 38, and the left and right side support portions 40, the seat back 12 is provided. Manufacturing man-hours can be reduced. That is, in the vehicle seat as described in the background section, it is necessary to separately manufacture a pair of left and right side wires and three seat springs (a total of five parts) and separately assemble them to the seat back frame. However, in the present embodiment, the same function can be ensured only by manufacturing the resin seat back spring 16 and the S spring 17 (two components in total) and assembling them to the seat back frame 14. Therefore, the number of parts and the number of man-hours for assembling parts to the seat back frame 14 can be greatly reduced, and the man-hours for manufacturing the seat back 12 can be greatly reduced. Thereby, manufacturing cost can be reduced significantly. Further, the resin spring portion 36 and the left and right side support portions 40 are made of resin, so that the mass of the vehicle seat 10 can be reduced.

  Further, in the present embodiment, the frame attachment portion 38 of the resin seat back spring 16 is formed in an open cross-sectional shape with an opening on the rear side of the seat, and the side frame 26 is fitted inside the frame attachment portion 38. Yes. Thereby, since the frame attaching part 38 can be favorably supported by the side frame 26, the supporting rigidity of the side support part 40 extended from the frame attaching part 38 to the seat front side can be improved. Therefore, the pad side portion 66 can be favorably supported by the side support portion 40, and the right and left holdability for the occupant P can be ensured favorably.

  In the present embodiment, the front wall 38 </ b> C provided at the inner portion in the seat width direction at the front end portion of the frame attachment portion 38 is in contact with the front surface of the front wall portion 26 </ b> B of the side frame 26. For this reason, when a load on the rear side of the seat is input to the frame attachment portion 38, the front wall is supported by the side frame 26 from the rear side of the seat, so that the load can be favorably supported. it can. In addition, since the side support portion 40 extends from the outer portion in the seat width direction at the front end portion of the frame attachment portion 38 to the front side of the seat, the side support portion 40 can be disposed at an appropriate position with respect to the occupant P. . That is, when the distance between the side support portion 40 and the occupant P is short, it is difficult to ensure a sufficient thickness of the pad side portion 66 interposed between the occupant P and the side support portion 40. There is a possibility that the cushioning property of 66, that is, the comfort of the passenger P may be impaired. On the other hand, when the distance between the side support portion 40 and the occupant P is long, the left and right holdability with respect to the occupant P may be reduced due to a reduction in the deformation suppressing effect of the pad side portion 66 by the side support portion 40. In this regard, in the present embodiment, the side support portion 40 can be disposed at an appropriate position with respect to the occupant P by the above-described configuration, so that both comfort and holdability can be ensured satisfactorily.

  Further, the resin seat back spring 16 according to the present embodiment is integrally provided with a resin lower panel portion 42 disposed on the lower side of the seat back frame 14 and to which the trim cover 20 is locked. For this reason, the lower panel generally formed of a metal plate and welded to the seat back frame and the welding process thereof can be omitted. Thereby, the manufacturing man-hour of the seat back 12 can be further reduced. That is, in the vehicle seat as described in the background art section, it is necessary to manufacture a lower panel in addition to the above-described five parts and separately assemble them on the seat back frame. On the other hand, in the present embodiment, the same function can be ensured only by assembling the resin seat back spring 16 and the S spring 17 (two components) to the seat back frame 14, so that the manufacturing efficiency of the seat back 12 is improved. Can be significantly improved, and the manufacturing cost can be greatly reduced. And since the resin-made lightweight lower panel part 42 is employ | adopted instead of the metal lower panel, the mass of the vehicle seat 10 can be reduced significantly.

  In the present embodiment, the lower panel portion 42 is formed with a plurality of locking holes 44 corresponding to the plurality of hooks 46 provided at the lower end portion of the trim cover 20. For this reason, after covering the seat back pad 18 with the trim cover 20, the lower end portion of the trim cover 20 can be easily locked to the lower panel portion 42 by hooking the hook 46 to the edge of the locking hole 44. Can do. Thereby, the manufacturing operation of the vehicle seat 10 can be facilitated.

  In the present embodiment, the resin spring portion 36 and the side support portion 40 of the resin seat back spring 16 are disposed below the seat back frame 14. For this reason, the waist part of the passenger | crew P for which higher hold property is calculated | required can be favorably supported by the resin spring part 36 and the side support part 40 from a sheet | seat back side and a sheet | seat width direction both sides.

  Furthermore, in the present embodiment, a metal S spring 17 is provided between the left and right side frames 26 on the upper portion of the seat back frame 14. The spring characteristics of the S spring 17 are set so that when the load from the occupant P to the rear side of the seat is input, the S spring 17 bends more greatly to the rear side of the seat than the resin spring portion 36. For this reason, at the time of a rear collision of the vehicle, the waist portion of the occupant P is supported by the resin spring portion 36 with a small amount of deflection, while the portion above the waist portion of the occupant P is quickly moved to the rear side of the seat by the large deflection of the S spring 17. Can be displaced. Thereby, since the time (what is called contact time) until the passenger | crew's P head contacts the headrest which is not illustrated can be shortened, the passenger | crew's P neck can be protected favorably.

  In the resin seat back spring 16 according to this embodiment, the resin spring portion 36 is integrally formed with the lower panel portion 42. For this reason, when manufacturing the resin seat back spring 16, it is desirable to take a method of pulling out a mold (slide mold) in one of the seat back height directions. Considering this point, the wave-shaped portion 48A of the resin spring main body 48 is tapered (draft angle) so that the slide mold can be removed in either of the seat back height directions. Therefore, the resin seat back spring 16 can be efficiently manufactured.

(Supplementary explanation of the embodiment)
In the above-described embodiment, the S spring 17 is provided on the upper portion of the seat back frame 14. However, the present invention is not limited thereto, and another type of metal spring is provided instead of the S spring 17. Alternatively, a configuration in which a resin spring is provided may be used.

  In the above embodiment, the resin spring part 36 and the side support part 40 are provided at the lower part of the seat back frame 14, but the present invention is not limited to this, and the resin spring part and the side support part extend to the upper side of the seat back frame. An extended configuration may be used.

  Moreover, in the said embodiment, when the hook 46 (locking tool) provided in the lower end part of the trim cover 20 (sheet | seat skin) is hooked on the hole edge part of the locking hole 44 formed in the lower panel part 42, it is. The lower end portion of the trim cover 20 is locked to the lower panel portion 42. However, the present invention is not limited to this, and the locking method of the seat cover to the lower panel portion can be changed as appropriate. The configuration may be omitted.

  In the above embodiment, the resin seat back spring 16 is integrally provided with the resin lower panel portion 42. However, the present invention is not limited to this, and the resin seat back spring 16 and the lower panel portion 42 are separated. It may be configured to be formed and assembled to the seat back frame 14 separately. In this case, the configuration of the mold for molding the resin seat back spring 16 can be simplified.

  Moreover, in the said embodiment, although the side support part 40 was set as the structure formed in the open cross-sectional shape which the sheet | seat back side opened by planar cross sectional view, it is not restricted to this, The shape of the side support part 40 can be changed suitably. . For example, you may comprise a side support part by the flat plate-shaped main-body part extended from the front-end part of the frame attaching part to the front side of a sheet | seat, and the 1 or several rib which reinforces the said main-body part.

  Furthermore, in the above-described embodiment, the resin spring portion 36, the left and right frame attachment portions 38, the left and right side support portions 40, and the lower panel portion 42 are integrally formed. You may make it integrate by welding etc. after manufacturing to a body.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat back 14 Seat back frame 16 Resin seat back spring 17 S spring (metal spring)
18 Seat back pad 20 Trim cover (seat skin)
26 Side frame 36 Resin spring part 38 Frame attachment part (supported part)
38A Front wall 40 Side support part 42 Lower panel part 44 Locking hole 46 Hook (locking tool)

Claims (6)

A resin spring portion disposed between a pair of left and right side frames in a seat back frame of a vehicle seat;
A pair of left and right supported portions connected to both ends of the resin spring portion in the seat width direction and supported on the front end sides of the pair of side frames;
A pair of left and right side support portions that extend from the pair of supported portions to the seat front side of the pair of side frames and support both side portions of the seat back pad;
Or integrally provided ,
The supported portion is formed in an open cross-sectional shape in which the seat rear side is opened in a plan view, and the side frame is fitted to the inside from the seat rear side,
The side frame has a front surface facing the front side of the seat,
The side support portion extends from the outer portion in the seat width direction at the front end portion of the supported portion to the seat front side,
A resin seat back spring provided with a front wall disposed opposite to the front surface of the side frame from the front side of the seat at an inner portion in the seat width direction at a front end portion of the supported portion .   The resin seat back spring according to claim 1, wherein the resin seat back spring is integrally or integrally provided with a resin lower panel portion disposed on a lower side of the seat back frame and to which a seat skin is locked.   The resin seat back spring according to claim 2, wherein a locking hole into which a locking tool for locking the seat cover to the lower panel portion is inserted is formed in the lower panel portion.   The said resin spring part and the said side support part are resin-made seat back springs in any one of Claims 1-3 arrange | positioned at the lower part side of the said seat back frame. A seat back frame;
The resin seat back spring according to any one of claims 1 to 4, supported by a pair of left and right side frames in the seat back frame,
A seat back pad supported by the seat back frame;
A sheet skin covering the surface of the seat back pad;
Vehicle seat equipped with A headrest is provided on the upper side of the seat back frame, and the resin spring portion of the resin seat back spring is disposed on a lower side of the seat back frame, and an upper side of the seat back frame. The vehicle seat according to claim 5, further comprising a metal spring attached to the pair of side frames and spanned between the two.