JP2011239910A - Seat structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve shock absorption properties of a seat suitable for a transport machine such as a vehicle, an airplane, and a train.SOLUTION: In a seat cushion part 10, a base net 170 for a cushion is supported between a front frame 130 and a rear frame 140 each supported resiliently by torsion bars 150 and 160. The front frame 130 and the rear frame 140 are supported by the torsion bars 150 and 160 via first and second arms 132 and 142, respectively. In this structure, a first arm part 132 of the front frame 130 is longer than a second arm part 142 of the rear frame 140. Consequently, when the front frame 130 and the rear frame 140 turn forward or backward when receiving a shock by front collision and back collision, downward force operates easily. Therefore, jumping out of a human body when a shock is applied is suppressed and rising of a human body upward along a seat back portion can be suppressed, thereby improving shock absorbing properties.

Description

  The present invention relates to a seat structure, and more particularly, to a seat structure suitable as a seat for a transportation device such as an automobile, an aircraft, and a train.

  In order to reduce the weight of the seat structure, the present applicant has proposed various seat structures using a tension structure provided with a three-dimensional solid knitted fabric or a two-dimensional net material on the cushion frame or the back frame. . In Patent Documents 1 to 3, a base net is stretched to a seat cushion portion via a torsion bar to give a predetermined cushion characteristic. In addition to a three-dimensional solid knitted fabric, a thin urethane material is used as a cushion material. It is possible to improve the vibration absorption characteristics and energy absorption characteristics while reducing the weight compared to the so-called “placement structure” type in which a conventional urethane material with a predetermined thickness is placed on a cushion pan or S spring. Is intended. Further, in Patent Document 4, when a predetermined load or more is applied to the cushion material stretched on the back frame by a rear-end collision or the like, the side frame falls down, thereby reducing the tension of the cushion material and reducing the impact force. It has a structure that can effectively attenuate. According to this, it is possible to receive the human body with a simple configuration and attenuate the impact force. In addition, there is an energy absorption effect due to the inward deformation of the side frame.

JP 2004-188164 A JP 2006-345902 A Japanese Patent Laid-Open No. 2006-345953 JP 2003-182427 A

  As described above, the seat structures of Patent Documents 1 to 4 are lightweight and excellent in vibration absorption characteristics and energy absorption characteristics. Particularly, the impact force is a base net stretched by a torsion bar. It is attenuated by the elongation of. However, at this time, if the movement of the human body in the direction of rising along the seat back part or the direction of jumping forward is large with respect to the front collision or the rear collision, the damping force due to the extension of the base net is hardly exhibited. In addition, the energy absorption performance due to frame deformation when subjected to an impact force exceeding a predetermined level induces breakage of places where the section modulus suddenly changes such as welds, holes, bolt connection parts, etc. Thus, by moving the coordinate point of the torsion bar support portion, the impact force is dispersed by providing a further damping effect. However, if the impact force is distributed in multiple directions, the way of deformation is difficult to be constant, and unstable elements may remain in the behavior of the occupant. For example, if the frame is greatly deformed too much in response to an impact, it will be difficult for the human body to escape thereafter. In addition, if the function of the recliner is impaired due to a rear collision or a front collision, it becomes difficult to return the seat back part to its original position. Therefore, it is desirable that damage to the recliner is as small as possible. Also, if the deformation of the front part of the seat becomes too large due to the frontal collision, if the collision occurs at a speed higher than the predetermined speed, the seat skeleton may appear to be crumbled and damage to the occupant may increase There is.

  The present invention has been made in view of the above, and when it receives an impact, it can convert a force into a couple and exhibit a high impact absorption characteristic. On the other hand, even when the frame is deformed, the human body can escape. It is an object to provide a seat structure that can secure the function of the recliner part as much as possible.

  In order to solve the above problems, a seat structure of the present invention is a seat structure including a seat cushion portion and a seat back portion connected to the seat cushion portion via a recliner portion, wherein the seat cushion is provided. The portion is spanned between a pair of side frames, a front frame elastically supported by a first torsion bar spanned between the front portions of the pair of side frames, and a rear portion of the pair of side frames. A rear frame that is elastically supported by the second torsion bar; and a cushion base net that is spanned between the front frame and the rear frame. A first arm portion extending in a direction protruding upward with respect to the position where the torsion bar is disposed, and the rear frame is configured to be unloaded when no load is applied. A second arm portion extending in a direction protruding upward with respect to a position where the second torsion bar is disposed, and the length of the first arm portion is longer than the length of the second arm portion. Characterized by its long length.

  The seat back portion includes a pair of side frames and a back base net spanned between the pair of side frames, and the pair of side frames of the seat cushion portion are supported by the pair of slide adjusters, respectively. The rear part bulges upward, the rear part is connected to the lower part of the side frame in the seat back part via the recliner part, and the seat cushion part is further closer to the front part in the pair of side frames. A front stabilizer that spans between the two parts, and an inner part between the parts near the front part of each side frame that is fixedly attached to each slide adjuster and supports the front stabilizer. 1 bracket, an upper plate located in the vicinity of each recliner, and the upper part A lower plate extending downward from the rate, and a second bracket provided adjacent to the rear reinforcing frame that spans between the rear portions of the pair of side frames. It is preferable that

  Each of the first brackets is fixed to the front stabilizer so that the lower end is fixed to the slide adjuster and the upper end has a predetermined gap with each side frame of the adjacent seat back portion. It is preferable. The second bracket is preferably partially fixed to each adjacent side frame. Each side frame of the seat cushion portion is preferably formed in a closed cross-sectional structure in which two thin plates are opposed to each other and integrated by hemming. It is preferable that the periphery of each side frame of the seat cushion portion is heat treated. In the seat cushion portion, it is preferable that a rear stabilizer is stretched between the front portion of the second torsion bar and the rear portion of the pair of side frames in the longitudinal direction. It is preferable that the rear stabilizer is disposed so as to span between the vicinity of the seat belt attaching portion in the pair of side frames. It is preferable that the front stabilizer and the rear stabilizer are connected to each other through a side frame formed in a closed cross-sectional structure from the thin plate. It is preferable that the first bracket and the second bracket are made of high-tensile steel. It is preferable that the yield stress of the high-tensile steel forming the first bracket and the second bracket is 600 MPa or more.

  The back frame is engaged with at least a part of the planar spring member spanned in the width direction at a position below the vertical center of the pair of side frames, and the planar spring member. A block member having a convex cross section projecting forward from the member, and when a human body enters the back frame upon receiving an impact force, the degree of engagement between the block member and the planar spring member is increased. It is preferable that the configuration decreases. It is preferable that two block members are attached to the planar spring member with an interval of 100 mm or more. The planar spring member is preferably an S spring. It is preferable that the block member is formed in a substantially oval shape, and the arc portion thereof and the arc portion of the S spring are made to coincide with each other by caulking. It further includes a pelvic support member having a front surface covering portion that covers the front surface of the planar spring member and the block member, and when the front surface covering portion is pressed rearward, the pelvis support member rotates backward, It is preferable that the degree of engagement between the block member and the planar spring member is reduced.

  The seat cushion portion is provided on the cushion base net by dividing the cushion surface layer cushion material into a plurality of layers, and covering the upper surface of the cushion surface layer cushion material with a skin material, and adjacent to the plurality of segments. It is preferable that the skin material is connected to the cushion base net by sewing between the cushion surface cushion materials.

  According to the present invention, in the seat cushion portion, the cushion base net is supported between the front frame and the rear frame that are elastically supported by the torsion bars, respectively. The torsion bar is supported via the first and second arm portions. Further, the first arm portion of the front frame has a structure that is longer than the second arm portion of the rear frame. Therefore, when the front frame and the rear frame are rotated forward or rearward under the impact of the front collision and the rear collision, a downward force tends to work. That is, at the time of a front collision, the first arm portion and the front frame rotate forward, and the second arm portion and the rear frame that are short in arm length but in a substantially vertical posture when no load is applied forward. By turning, the cent load moves backward and upward. Then, on the contrary, the human body at the time of receiving an impact moves downward and forward. Accordingly, the front frame is prevented from jumping forward when the front frame receives an impact, and the impact absorption characteristics are improved. Also, at the time of a rear impact, it acts in the reverse of the above, and the cent load moves forward and upward, so the human body moves backward and downward, and upward along the seat back. It is possible to suppress the rise and improve the shock absorption characteristics.

  Further, according to the present invention, the seat cushion portion has a structure having a front stabilizer spanned between the front portions of the pair of side frames, and a first bracket attached to the side frame is fixed to each slide adjuster, It is preferable to have a structure that supports the partial stabilizer. Furthermore, it is preferable to have a structure having a second bracket adjacent to the recliner portion.

  When receiving the impact force due to the front collision, as described above, the front frame and the rear frame try to rotate forward and downward. However, when an impact force is applied, the side frame is deformed so that the center area bulges outward from the weak points such as welds and holes, and the upper edge area collapses inward. May not be able to move smoothly forward and downward. In contrast, in the present invention, the front stabilizer that functions as a load transmission path is provided, and the first bracket that supports the front stabilizer is fixed to the slide adjuster, so that the force is released to the slide adjuster. Further, a virtual quadrangle connecting high strength parts is formed by connecting a virtual quadrangle formed by connecting the first bracket and the front stabilizer via the left and right side frames, the second bracket and the rear reinforcing frame. Since a plurality of virtual quadrangles and the like are designed to be formed on the cushion frame, deformation of the side frame is suppressed. Note that, unlike a truss structure, a virtual quadrilateral is likely to be sheared and deformed to become a collapsed parallelogram if it is only one. However, since there are a plurality of virtual rectangles that are easily deformed, even if each of them tries to deform with a large displacement, the plurality of virtual rectangles interfere with each other, so that the deformation is reduced. That is, when subjected to an impact, the cushion frame has a structure having a plurality of virtual quadrilaterals to induce shear deformation, and further, couple force and compression / tensile force act on each load point. It has a structure that dissipates power. And in order to exhibit this effect | action and an effect more effectively, it is preferable that the front part stabilizer and the rear part stabilizer are penetrated by the side frame formed from the thin plate, and are joined. When a heavy load is input, a shift (movement) in the rotational direction occurs between each stabilizer (or a bush around the stabilizer, etc.) and the through hole of the thin plate, so that the impact force is effectively dissipated. Further, the load transmission path transmits a force in a substantially vertical direction to the front lower side, that is, the slide adjuster via the front frame and the rear frame by the longitudinal motion and the vertical motion as the motion direction of the occupant. The cushion base net stretched between the front frame and the rear frame and the cushion material disposed on the cushion base net are stretched by being pressed downward to increase the damping ratio. Therefore, according to the present invention, the damping force due to the action of the cushion base net or the like can be sufficiently functioned, and the damping ratio when receiving an impact at the seat cushion portion can be made higher than before.

FIG. 1 is a front view showing a seat structure according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line CC of FIG. FIG. 3 is a side view of FIG. 4A is a cross-sectional view taken along line AA in FIG. 3 and a partial detail view thereof, and FIG. 4B is a diagram for explaining the movement. 5 is a cross-sectional view taken along line BB in FIG. Fig.6 (a) is the side view which showed the back frame and the cushion frame, (b) is the BB sectional drawing of (a). FIG. 7 is an exploded perspective view showing a part of FIG. FIG. 8 is a perspective view seen from the back side showing a state in which the back base net and the cushion base net are attached to the back frame and the cushion frame. FIG. 9 is a partially omitted perspective view mainly showing a torsion bar, a front frame, and a rear frame among the back frame and the cushion frame according to the embodiment. FIG. 10 is a partially omitted side view mainly showing the torsion bar, the front frame, and the rear frame among the back frame and the cushion frame according to the embodiment. FIG. 11 is a perspective view in which the torsion bar, the front frame, and the rear frame are omitted from the back frame and the cushion frame according to the embodiment. FIG. 12A is a side view showing the torsion bar, the front frame, and the rear frame out of the back frame and the cushion frame according to the embodiment, and FIG. It is an AA sectional view taken on the line. FIG. 13 is a front view illustrating the torsion bar, the front frame, and the rear frame in the back frame and the cushion frame according to the above embodiment. FIG. 14 is a diagram for explaining the operation of the seat structure according to the embodiment. FIG. 15 is a view for explaining the action at the time of a front collision of the seat structure according to the embodiment. FIG. 16 is a view for explaining the action at the time of a rear collision of the seat structure according to the embodiment. 17 (a) and 17 (b) are views showing the side frames in the seat cushion portion before and after deformation in the collision experiment. FIG. 18 is a graph showing the result of the collision experiment, and the area shows the amount of energy absorption. FIG. 19 is a perspective view showing a cushion frame and a back frame of a seat structure that employs a pelvic support member, an S spring, and an elliptical support block according to another example. 20 is an exploded perspective view of FIG. FIG. 21 is a perspective view showing a state in which the pelvic support member is removed from FIG. FIG. 22 is a front view of FIG.

  Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. First, based on FIGS. 1-18, the vehicle seat structure 1 which concerns on one Embodiment of this invention is demonstrated. As shown in these drawings, the seat structure 1 of the present embodiment includes a seat cushion portion 10 and a seat back portion 20 provided to be tiltable with respect to the seat cushion portion 10.

  The cushion frame 100 constituting the seat cushion portion 10 includes a pair of side frames 110 and 120 arranged at a predetermined interval, a front frame 130 arranged on the front edge side of the side frames 110 and 120, and a rear edge side. And a rear frame 140 disposed on the rear side.

  The front frame 130 is formed in a substantially U shape having a horizontal portion 131 and first arm portions 132 and 132 bent in a direction substantially orthogonal to both sides of the horizontal portion 131. The base end portions of the first arm portions 132 and 132 are connected to the first torsion bar 150 spanned between the vicinity of the front edge portions of the side frames 110 and 120, respectively. As a result, the elastic force of the first torsion bar 150 acts when the first arm portions 132 and 132 and the horizontal portion 131 positioned therebetween rotate in the front-rear direction. In the present embodiment, the front frame 130 has a configuration in which the horizontal portion 131 and the first arm portions 132 and 132 are integrated, but the front frame 130 is configured only by the horizontal portion 131, and Of course, a separate pipe member or bar member may be supported by the first torsion bar 150 as the first arm portions 132 and 132.

  Like the front frame 130 described above, the rear frame 140 has a horizontal portion 141 and second arm portions 142 and 142 that are bent in a direction substantially orthogonal to both sides of the horizontal portion 141. It is formed in a shape. The base end portions of the second arm portions 142 and 142 are connected to second torsion bars 160 spanned between the vicinity of the rear edges of the side frames 110 and 120, respectively. As a result, the elastic force of the second torsion bar 160 acts when the second arm portions 142, 142 and the horizontal portion 141 positioned therebetween rotate in the front-rear direction. In the present embodiment, the rear frame 140 also has a configuration in which the horizontal portion 141 and the second arm portions 142 and 142 are integrated in the same manner as the front frame 130 described above. Of course, it is also possible to adopt a configuration in which the second torsion bar 160 is supported by the second arm portions 142 and 142 as separate pipe members and rod members.

  Here, the front frame 130 and the rear frame 140 are arranged so that the first arm portion 131 and the second arm portion 142 are located above the respective positions of the first torsion bar 150 and the second torsion bar 160 when no load is applied. It is provided in a posture that extends in the direction of projecting. In this case, the second arm part 142 is preferably set so as to be substantially perpendicular to the horizontal plane, specifically, within a range of 70 degrees to 90 degrees, and the first arm part 131 is the second arm part. Preferably, the length is longer than 141. The reason for this is to alleviate the impact force and further improve the energy absorbability. The details of the action and effect will be described later.

  The cushion base net 170 is stretched between the horizontal portion 131 of the front frame 130 and the horizontal portion 141 of the rear frame 140 of the cushion frame 100 described above. The cushion base net 170 may be a two-dimensional fabric, a two-dimensional fabric laminated with a thin urethane material, or a three-dimensional solid knitted fabric disclosed by the present applicant in JP-A-2003-182427. Can do.

  One cushion base net 170 is looped around the horizontal portion 131 of the front frame 130 and the horizontal portion 141 of the rear frame 140, and the end edges are connected to each other. . By wrapping around the loop, the cushion base net 170 has a two-layer structure of an upper layer portion 171 and a lower layer portion 172, and a gap 173 is generated between the two layers. The connecting method of the edge portions of the base net 170 for cushion is arbitrary, and it can be connected by sewing means, but is engaged through an engaging member (not shown) such as a slide fastener, and the engaging member However, it is preferable to arrange them so as to be in contact with the front frame 130 or the rear frame 140. By doing so, the frictional force between the engagement member such as the slide fastener and the front frame 130 or the rear frame 140 is increased, and the front frame of the cushion base net 170 hung around in a loop shape. A relative positional shift with respect to 130 and the rear frame 140 can be suppressed. In addition, when an impact force greater than that during normal use is input, a force greater than the frictional force generated on the slide fastener is applied to the cushion base net 170, and a rotational force and a displacement force are applied to the loop-shaped cushion base net 170. And again, energy is dissipated.

  A cushion surface layer cushion material 180 is provided on the cushion base net 170. As the cushion surface layer cushion material 180, a three-dimensional solid knitted fabric, a bead foam, a urethane material, or a laminate thereof can be used. In this embodiment, as shown in FIGS. 2 and 5, a three-dimensional solid knitted fabric (or slab urethane) 183 and a bead foam 184 are used, which are covered with a skin material 181. Yes. The bead foam 184 is preferably divided into, for example, a front part 184a, a rear part 184b, and side parts 184c and 184d. In this case, only the rear portion 184b of the bead foam 184 can be formed from urethane. Moreover, it can also be set as the structure which does not have the part corresponded to the rear part 184b. That is, the foam foam 184 is laminated on the cushion base net 170, the three-dimensional solid knitted fabric 183 is further laminated thereon, and further covered with the skin material 181. The skin material 181 is fixed to the cushion base net 170 by sewing at the boundary between the front part 184a and the rear part 184b of the divided bead foam 184, or at the boundary between each of the side parts 184c and 184d. Preferably it is. In the present embodiment, as shown in FIG. 5, the skin material 181 is connected to the cushion base net 170 via the draw cloth 184e. On the other hand, the front part 184a, the rear part 184b and the side parts 184c, 184d constituting the bead foam 184 are not fixed to the cushion base net 170, and the bead foam 184 is not attached to the cushion base net 170. It is preferable to be in a state of being placed on the top. As a result, the four parts of the front part 184a, the rear part 184b, and each side part of the bead foam 184 are displaceable relative to the cushion base net 170 in a state of being wrapped in the skin material 181. The displacement is useful for energy absorption. The bead foam 184 is preferably divided into four in this manner, but is not limited to this.

  In this way, the bead foam 184 is divided into a plurality of pieces as described above, covered with the skin material 181, and is sewn to the cushion base net 170 at the boundary between the front portions 184 a and 184 b of the divided bead foam 184. By being connected, the skin material 181 holds a predetermined surface shape by the highly rigid cushion base net 170. Thereby, in a normal use state, they are not greatly displaced / deformed. However, when a large input such as an impact force is applied, deformation at the boundary between the front portions 184a and 184b or the front of the above-described bead foam 184 is possible. Energy is absorbed by the relative displacement of the portion 184a, the rear portion 184b, and the side portions with respect to the cushion base net 170.

  The three-dimensional solid knitted fabric 183 includes, for example, a pair of ground knitted fabrics that are arranged apart from each other as disclosed in JP-A-2002-331603, JP-A-2003-182427, and the like. This is a knitted fabric having a three-dimensional three-dimensional structure having a large number of connecting yarns that reciprocate between a pair of ground knitted fabrics to couple them together. As the bead foam 184, for example, a foam molded body by a resin bead method containing at least one of polystyrene, polypropylene, and polyethylene can be used.

  Here, in this embodiment, in order to increase the strength of the cushion frame 100 in the vicinity of the integrated center of gravity that is obtained by adding the two centers of gravity of the passenger and the seat, as shown in FIG. In order to transmit the force to the slide adjusters 111 and 121 at a position closer to the rear than the middle in the longitudinal direction of the side frames 110 and 120, preferably between the vicinity of the seat belt mounting portion, between the side frames 110 and 120. A spanning reinforcing pipe (rear stabilizer) 125 is provided. By having the rear stabilizer 125, the side frame 110, 120 is prevented from being deformed in the direction of opening outward when subjected to an impact, and the force is applied to the slide adjusters 111, 121, which are rigid bodies below, on the surface. On the other hand, the force transmitted in the vertical direction is reduced, and the force transmitted to the side frames 110 and 120 is reduced, and the inward tilt more than necessary is suppressed (see FIG. 13).

  Further, a reinforcing pipe (front stabilizer) 126 is spanned between the portions of the pair of side frames 110 and 120 near the front. As shown in FIGS. 11 and 12, the front stabilizer 126 is set on the slide adjusters 111 and 121 via the first brackets 112 and 122 that transmit the force to the slide adjusters 111 and 121. , Dissipate and buffer the initial force when the occupant starts moving forward, and transmit the force downward. The side frames 110 and 120 are both supported by the slide adjusters 111 and 121, and the front stabilizer 126 is supported by the first brackets 112 and 122 as shown in FIGS. Specifically, the first brackets 112 and 122 are provided inside the side frames 110 and 120, the lower ends are fixed to the slide adjusters 111 and 121, and the upper ends are separated from the side frames 110 and 120 inwardly. The upper end is fixed to the front stabilizer 126. Similarly to the rear stabilizer 125, the front stabilizer 126 also prevents the side frames 110 and 120 from being deformed in the direction of opening outward and being more than necessary, but in addition to this, Since there is one bracket 112, 122, the load applied to the center portion of the front stabilizer 126 is caused by a virtual quadrangle composed of side frames 110, 120, first brackets 112, 122, slide adjusters 111, 121 and couples In addition, it acts to reliably transmit the force generated by the front frame 130 moving forward and downward to the slide adjusters 111 and 121, which are rigid bodies, via the first brackets 112 and 122. The action also prevents the side frames 110 and 120 from falling more than necessary.

  In the present embodiment, the rear portions 113 and 123 bulge upward in the side frames 110 and 120, and the rear portions 113 and 123 are recliner portions 190 and 191 below the side frames 210 and 220 of the seat back portion 20. The second brackets 114 and 124 are provided adjacent to the recliner portions 190 and 191. As shown in FIG. 11, the second brackets 114 and 124 are disposed on the inner surfaces of the rear portions 113 and 123 of the side frames 110 and 120. Upper plates 114a and 124a located in the vicinity of the recliner portions 190 and 191 and lower plates 114b and 124b extending downward from the upper plates 114a and 124a are integrally formed. The lower plates 114b and 124b are provided so as to be adjacent to the rear reinforcing frame 195 spanned between the lower sides of the rear portions 113 and 123 of the side frames 110 and 120. Preferably, the lower plates 114b and 124b are integrated with the rear reinforcing frame 195 by welding or the like. Further, it is preferable that the second brackets 114 and 124 are partially fixed to the adjacent side frames 110 and 120 by welding instead of the entire surface of the opposing surfaces. When the side frames 110 and 120 are formed from a thin plate, if they are welded over the entire surface, they serve as a mere reinforcing material. Then, when receiving an impact force, the portions of the side frames 110 and 120 that are integrated with the second brackets 114 and 124 are integrally pulled and deformed by displacement, couple, shear deformation, buckling, and the like. Difficult to dissipate energy. However, by partially welding, the restraint points become points or lines, giving the structure a degree of freedom. This induces plastic deformation and elastic deformation of the structure, increases the number of parts where couples are generated, cancels the force by pulling and compressing, creates a space where people can invade, constrains, and strength and durability Can be balanced.

  As a result, the second brackets 114 and 124, the portions of the side frames 110 and 120 adjacent thereto, and the rear reinforcing frame 195 serve as strength members, and function to suppress unnecessary deformation of the side frames 110 and 120. In addition, in order to further suppress the deformation of the side frames 110, 120, the first brackets 112, 122 and the second brackets 114, 124 are made of high-tensile steel having a yield stress of 600 MPa or more, and It is preferable to reduce the deformation.

  Further, the side frames 110 and 120 are formed by using two thin plates and bending the peripheral portion in the opposing direction. This is to reduce the weight of the side frames 110 and 120, but in order to maintain a predetermined strength in spite of being thin, the two thin plates are opposed to each other and integrated by hemming. It is preferable to form with a closed cross-sectional structure (see FIG. 12B). Further, in order to maintain a predetermined strength, it is preferable that the peripheral edge of each side frame 110, 120, which becomes a high stress portion, is given high tension by heat treatment. By performing such heat treatment, as shown in FIG. 14, a virtual quadrilateral that connects the high-tensile portions is formed also in the side frames 110 and 120. By deforming, energy can be dissipated by generating couple, shear deformation, buckling and the like.

  By adopting the configuration as described above, each side frame 110, 120 does not deform more than necessary outward or inward as indicated by an imaginary line in FIG. The rear portions 113 and 123 are deformed so as to rotate backward (see FIGS. 17A and 17B).

  Here, as shown in FIG. 5 and FIG. 6B, each end of the front stabilizer 126 and the rear stabilizer 125 passes through the side frames 110 and 120 having a closed cross-sectional structure. So that they are connected. Specifically, as shown in FIG. 5, each end portion of the front stabilizer 126 passes through each side frame 110, 120, and its edge is welded to the outer surface of each side frame 110, 120. Has been. As shown in FIG. 6B, each end of the rear stabilizer 125 passes through the side frames 110 and 120 and is connected via a bush 125a. In this way, by providing the stabilizers 125 and 126 so as to penetrate the side frames 110 and 120, when a heavy load is input, the stabilizers 110 and 120 and the through holes of the side frames 110 and 120 made of thin plates are provided. A shift (movement) in the rotational direction occurs, and the impact force is dissipated.

  As shown in FIGS. 9 to 10, the back frame 200 constituting the seat back portion 20 is formed between a pair of side frames 210 and 220 arranged at a predetermined interval and the upper portions of the side frames 210 and 220. The first upper frame 230 and the second upper frame 240 are disposed, and the lower frame 250 is disposed between the lower portions of the side frames 210 and 220. The lower portions of the side frames 210 and 220 of the back frame 200 are connected to the rear portions 113 and 123 of the side frames 110 and 120 of the cushion frame 100 via recliner portions 190 and 191, and the back frame 200 is connected to the cushion frame 100. It can be tilted back and forth.

  Each of the side frames 210 and 220 of the back frame 200 is formed of a plate-like member having a predetermined width, and the width direction thereof is arranged in a direction substantially along the front-rear direction. Specifically, as shown in FIGS. 9 to 10, the width of the back frame 200 gradually increases from the upper side to the lower side, and the inclination of the back frame 200 with respect to the cushion frame 100 is approximately 90 degrees. When viewed from the side in the state of the degree, the front edge portions 210a and 220a are along a line inclined in a direction protruding forward from the upper side to the lower side, and the rear edge portions 210b and 220b are substantially vertical. It has a shape along a straight line. Further, both the front edge portions 210a and 220a and the rear edge portions 210b and 220b are substantially straight lines with no large unevenness in the middle.

  The first upper frame 230 includes a lateral frame portion 231 slightly inclined downward toward the outside, and the front edges of the pair of side frames 210 and 220 extending downward from the end portions of the lateral frame portion 231. It is a structure which has the vertical direction frame part 232 each connected by the upper end part. A headrest support portion 233 that is bent in a substantially inverted U shape is integrally formed at a substantially central portion of the lateral frame portion 231.

  The second upper frame 240 includes a lateral frame portion 241 that is slightly inclined downward toward the outside, and each trailing edge of the pair of side frames 210 and 220 extending downward from each end portion of the lateral frame portion 241. It has a structure having a vertical frame portion 242 respectively connected to the upper end portion.

  Here, in the present embodiment, between the side frames 210 and 220, from the lateral frame portions 231 and 241 of the first upper frame 230 and the second upper frame 240, lower end portions of the rear edges of the side frames 210 and 220, respectively. In the space up to the lower frame 250 spanned between, there is an intrusion space 260 in which no other frame is arranged.

  In a position slightly above the lower frame 250, that is, in a position corresponding to the vicinity of the waist from the upper part of the seated person's pelvis, an S spring 251 as a planar spring member spans around the front edge side of the side frames 210 and 220. (See FIG. 7). The S spring 251 abuts near the waist from the seated person's pelvis and gives a sense of stroke in the front-rear direction. The S spring 251 is preferably provided in an arch shape in which the central portion in the width direction bulges forward or backward. If it is formed in an arch shape that bulges forward, it can make it easier to feel a stroke, and the width against load fluctuations expands. On the other hand, if it is formed in an arch shape that bulges backward, it follows the back of the person. A feeling of fitting improves, the space for strokes can be reduced, and it responds to load fluctuations by changing the support position on the body side. Since there is a problem of the preference of the seated person, it can be selected depending on the type of vehicle (sedan type, sports type, etc.) such as an automobile in which the seat structure of this embodiment is installed. When the S spring 251 is provided, when pressed on the upper edge side, the S spring 251 rotates rearward about the lower edge side, and the pelvis can be supported by the reaction force of the spring from diagonally downward to diagonally upward. Further, when an inertial force is input in the left-right direction, a stroke with a small reaction force is generated due to a relatively small spring constant, and the pelvis is firmly supported while causing a rotational motion. It is to be noted that the supporting pressure is easily applied from diagonally downward to diagonally and the supporting force is obtained by the torsional force of the S spring 251 so that the reaction force of the leg support is the sum of bending, pulling and twisting of the S spring 251. Therefore, the S spring 251 is preferably provided integrally with the pelvis support member 252 shown in FIG. However, a space for a person to enter at the time of a rear collision is ensured with the connecting rod 295 spanned between the left and right recliners as a fulcrum, with the upper line of the pelvis support member 252 as the point of action.

  As shown in FIGS. 2 and 7, the pelvis support member 252 is formed by processing a bead foam into a substantially L shape in a side view, is formed with a width narrower than that of the S spring 251, and the front covering portion 252a is formed. The upper part is a warped part 252b. The front surface covering portion 252a covers the front surface of the S spring 251. It is only necessary to cover the front surface of the S spring 251, and the back surface of the front surface covering portion 252 a may be integrated with the front surface of the front surface covering portion 251 by bonding means such as adhesion. The S spring 251 is integrally molded so as to be embedded within the thickness range of the portion 252a. The warped portion 252b extends upward from the front covering portion 252a to a position corresponding to the waist of the seated person, and has an upper end edge slightly warped backward. By having the warped portion 252b, when the seat occupant applies a load to the rear, a force is applied to rotate the warped portion 252b diagonally downward, so that the reaction force is from the pelvis of the seated person to the waist. Is pressed from diagonally downward to diagonally upward.

  Further, by providing the pelvis support member 252 integrally with the S spring 251, the pelvis support member 252 projects the vicinity of the lower end of the back base net 270, which will be described later, to the front by the elasticity of the S spring 251. Help get shape.

  A back base net 270 is supported on the side frames 210 and 220 and the first and second upper frames 230 and 240 of the back frame 200. 2 to 8, the back base net 270 includes a front cover portion 271 that covers the front side of the back frame 200, a back cover portion 272 that covers the back side, a side frame 210, Side surface covering portions 273 and 274 covering 220 are provided.

  The front covering portion 271 has a size from the horizontal frame portions 231 and 241 of the first upper frame 230 and the second upper frame 240 to a position corresponding to the lower frame 250. As shown in FIG. 2, the back cover portion 272 is provided on the respective rear edge sides of the side frames 210 and 220 up to the vicinity of the center in the vertical direction. The back surface covering portion 272 has a bag shape formed integrally with the front surface covering portion 271, and a slit 275 is formed at the boundary between the upper edge portion of the front surface covering portion 271 and the back surface covering portion 272. The headrest support part 233 is covered so as to protrude from (see FIG. 7).

  The side surface covering portions 273 and 274 are integrally provided on both sides of the front surface covering portion 271, and lower end edges 273 a and 274 a are hung from the front edge side to the rear edge side of the side frames 210 and 220 through the outside. After being rotated, it passes through the inside of each side frame 210, 220 and is fixed so as to be pulled out to the front edge side (see FIG. 8).

  By stretching the back base net 270 in this way, the portions near the side frames 210 and 220 corresponding to the body side of the seated person become parts with small bending back and forth, and the center line of the back base net 270 The part corresponding to the spinal column of the trunk along the trunk is easily bent back and forth. As a result, if an inertial force acts in the left-right direction during cornering, a rotational movement around the spine of the trunk tends to occur. When the rotational movement occurs, if the portion along the center line bends back and forth, the support pressure of the S spring 251 increases. This increased support pressure prevents the body from shifting in the left-right direction due to the frictional force generated between the seated person and the seat back portion 20 and the rotational force of the rotation.

  The seat back portion 20 is further formed with a narrower width than the back base net 270, and is fixed or temporarily fixed to the back base net 270 so that the lower portion is located at a position corresponding to at least the waist portion of the seated person. The back fixing pad 280 is provided (see FIGS. 4 and 7). The back fixing pad 280 is formed with a predetermined thickness from, for example, a three-dimensional solid knitted fabric, a urethane material, a bead foam or the like. Specifically, as shown in FIG. 4, the center line portions of the back skin material 300 and the back base net 270 that cover the surface of the back fixing pad 280 are sewn together, and the back skin Both side edges of the front covering portion 271 of the material 300 and the back base net 270 are also sewn and temporarily fixed between the left and right back skin materials 300 around the center line and the back base net 270. . In order to reduce the weight, the back fixing pad 280 can be formed of a bead foam.

  Around the back fixed pad 280, a back movable pad 290 is disposed so as to cover the side frames 210 and 220 via the back base net 270. The back movable pad 290 has a pair of shoulder rib support portions 291 and 292 corresponding to the shoulder ribs of the seated person, and the shoulder rib support portions 291 and 292 are connected to each other and extend downward from the shoulder rib support portions 291 and 292. It is formed in a substantially U shape when viewed from the front having the covering portions 293 and 294. The side covering portions 293 and 294 are formed in a substantially U-shaped cross section so as to cover the front side, side surface side, and back side of the side frames 210 and 220. Then, on the back frame 200 covered with the back base net 270 as described above, the headrest support portion 233 is moved upward from between the shoulder rib support portions 291 and 292 so that the shoulder rib support portions 291 and 292 are positioned on the upper side. The side frames 210 and 220 are disposed so as to cover the side covering portions 293 and 294 having a substantially U-shaped cross section. The back skin material 300 covers the outer surface of the back movable pad 290 (side covering portions 293 and 294), but is covered so as to allow movement of the back movable pad 290. As a result, at least the side covering portions 293 and 294 of the back movable pad 290 follow the movement of the person and show a movement relatively independent of the back base net 270.

  By having the back movable pad 290, the shoulder ribs of the seated person abut against the shoulder rib support portions 291 and 292. Since the shoulder rib support portions 291 and 292 are located in the back base net 270 near the side frames 210 and 220, they are portions with less deflection in the front-rear direction than the portions along the center line. Therefore, when the shoulder rib of the seated person comes into contact, the shoulder rib support portions 291 and 292 exert a predetermined support pressure. As a result, a high frictional force is generated between the shoulder ribs and the shoulder rib support portions 291 and 292 compared to the portion corresponding to the center line of the back base net 270 which is easily bent back and forth, so that the inertial force in the left and right direction is increased. When working, the lateral displacement of the scapula support portions 291 and 292 is suppressed, and rotational motion about the spinal column is likely to occur with the pelvis as the input point. On the other hand, the back movable pad 290 is merely disposed so as to cover the side frames 210 and 220 by the side cover portions 293 and 294, and follows the movement of the person as described above, and S The elastic force by the spring 251 acts to move independently from the back base net 270. The human shoulder rib, pelvis or waist is a part that moves well. For example, if the shoulder rib support portions 291 and 292 are fixedly arranged, the range of movement of the shoulder rib is restricted, and a cramped feeling is generated. It interferes with respiratory movement. However, if the back movable pad 290 is movably disposed with respect to the back base net 270 in this way, the back movable pad 290 moves according to the movement of the shoulder ribs, and thereby the body movement is not hindered. Does not occur or obstructs respiratory movement. Even if the rigidity of the frame of the back frame 200 and the cushion frame 100 is increased, the back movable pad 290 is easy to move, thereby absorbing the vertical vibration energy and impact energy input from the road surface. Can do. Further, even when the occupant's body tries to enter the intrusion space 260 of the back frame 200 due to a rear collision, the movement is not disturbed.

  According to the present embodiment, when no load is applied, as shown in FIG. 2, the first arm portion 132 extends obliquely forward and the second arm portion 142 extends substantially directly upward. When a person is seated in this state, the rear frame 140 is supported by the second arm portion 142 having a shorter length, so that the power transmission efficiency is better than that of the front frame 130. It moves well and the second arm part 142 rotates forward. Accordingly, the position of the front frame 130 is relatively higher, and the position of the hip point is stabilized. That is, the front frame 130 is pushed up from below from the vicinity of the center of the thigh to the vicinity of the knee to form a weir. Thereby, a stable seating posture can be achieved. When vibration is input during normal driving, the front frame 130 and the rear frame 140 that support the cushion base net 170 are elastically displaced in the front-rear direction by the torsion bars 150 and 160 to absorb the vibration. To do.

  When receiving the impact force due to the front collision, the first arm portion 132 of the front frame 130 and the second arm portion 142 of the rear frame 140 move like the cent load shown in FIG. Therefore, the downward component force acts. Then, the hip point is displaced so as to approach the front frame 130, the front frame 130 is pressed from the vicinity of the center of the thigh to the vicinity of the knee, and the rotation of the first arm unit 132 is eventually performed. When reaching the limit, the acceleration is reduced by the buffer mechanism composed of the first torsion bar 150 and the base net 170, and the front frame 130 and the first arm part 132 are buckled to absorb the impact force. While preventing the human body from jumping forward. When receiving the impact force due to the rear impact, the first arm portion 132 of the front frame 130 and the second arm portion 142 of the rear frame 140 move like the cent load shown in FIG. Acts in the opposite direction. Although the second arm portion 142 is shorter than the first arm portion 132, the second arm portion 142 is set in a substantially vertical posture when no load is applied so that the efficiency is effectively improved. Since the movement to the position occurs in the V zone formed by the seat back portion 20 and the seat cushion portion 10 so as to enter the back frame 200, the trajectory is restricted. When a force is applied to the second arm portion 142 due to the constrained movement of the center of gravity, a downward component force is applied when the second arm portion 142 rotates backward. As a result, both the front frame 130 and the rear frame 140 rotate rearward and downward, and the movement of the human body rising along the seat back portion 20 is suppressed. As a result, the cushion base net 170 is stretched and the impact force is attenuated.

  Further, in the present embodiment, when an impact force is received due to a rear collision, the central shaft portions of the recliner portions 190 and 191 connected to the side frames 210 and 220 of the seat back portion 20 serve as a deformation trigger. The back part 20 is deformed rearward. Although the impact force is absorbed by this deformation, if the seat back part falls too much (when it deforms too much), the escape property of the human body is impaired. Further, depending on the case, the function of the recliner part is also impaired, and thereafter it becomes difficult to return the seat back part. However, in the present embodiment, the second brackets 114 and 124 are integrated with the upper plates 114a and 124a and the lower plates 114b and 124b, and the upper plates 114a and 124a are provided side by side with the recliner portions 190 and 191. 124 b is attached to the rear reinforcing frame 195. Since the upper plates 114a and 124a are provided side by side with the recliner portions 190 and 191, deformation of the recliner portions 190 and 191 is suppressed, and the impact force passes from the recliner portions 190 and 191 to the lower plates 114b and 124b via the upper plates 114a and 124a. To the rear reinforcing frame 195 provided on the lower plates 114b and 124b. That is, force can be received by the second brackets 114 and 124 and the rear reinforcing frame 195 (see FIG. 14). Thereby, the recliner parts 190 and 191 are helped by the energy absorbability of the peripheral easily deformable parts, and the function parts are protected, and the force for deforming the seat back part 20 backward is reduced. On the other hand, since the opening deformation of the side frames 110 and 120 of the seat cushion portion 10 is suppressed (see FIG. 13), the front frame 130 and the rear frame 140 that support the cushion base net 170 are smoothly moved rearward and downward. Displace. As a result, the human body is pressed so as to press the seat back portion 20 backward and downward. When the seat back part 20 is pressed from the rear to the rear lower direction, the back base net 170 stretched on the seat back part 20 is pushed rearward to cause elongation and increase the damping ratio. Therefore, in the present invention, the damping force due to the action of the back base net 170 of the seat back portion 20 can be sufficiently functioned.

  The first bracket 112, 122, the second bracket 114, 124, the front stabilizer 126, the rear stabilizer 125, and the rear reinforcing frame employed in the seat structure 1 (strong skeleton) of the present embodiment and the seat structure 1 of the present embodiment. A collision experiment was conducted on a seat structure (flexible skeleton) without 195. The seat structure 1 (strong skeleton) of the present embodiment has almost no difference between natural vibrations of the front and rear and left and right, both of which are about 50 Hz or higher, and the seat structure of the flexible skeleton has a natural frequency of 20 to 50 Hz. It was a structure with natural vibration difference between front and rear and left and right. The seat structure 1 (strong skeleton) and the flexible skeleton seat structure of the present embodiment are the same in other structures including a torsion bar. The results are shown in FIGS.

  FIG. 17A shows the deformation behavior due to the collision of the rear portions 113 and 123 of the side frames 110 and 120 of the seat structure 1 of the present embodiment. As shown in FIG. 17A, up to a predetermined load, the amount of deformation of the rear portions 113 and 123 to the rear is small and a high reaction force is exhibited. However, when the predetermined load is exceeded, the reaction force decreases and the rearward movement is reduced. The amount of deformation increases and eventually buckles. Such behavior is the same in the “flexible skeleton” seat structure in which the front stabilizer 126, the rear stabilizer 125, and the like are not provided, although there is a difference in the amount of deformation. FIG. 18 shows the reaction force, but the seat structure 1 (strong skeleton) of the present embodiment has a strength that is at least twice that of the flexible skeleton seat structure. However, the energy absorption performance and reaction force of the “flexible skeleton” itself are sufficiently worthy of function as a skeleton structure of an automobile seat. Therefore, the seat structure 1 of the present embodiment is suitable for securing a space for a person to enter and reducing acceleration acting on the person because both the deformation direction and the deformation amount are suppressed. Here, as described above, the seat structure 1 of the present embodiment is formed as a strong skeleton having a high natural frequency despite the fact that it is a thin plate structure in which the side frames 110, 120 and the like are made of thin plates. . This is because, as described above, the front stabilizer 126 and the rear stabilizer 125 made of a thin plate pipe having a closed cross-sectional structure are connected to the side frames 110 and 120 by pin joints, and the side frames 110 and 120 are hemmed. This is because a closed cross-sectional structure is formed by processing, and the side frames 110 and 120 are heat-treated. Thereby, although the seat structure 1 of this embodiment is a strong skeleton, when an impact force of a predetermined level or more is applied, the force is dissipated by the relative movement in the pin joint portion, and the side made of a thin plate Energy can be absorbed without causing large deformations in the frames 110 and 120.

  19 to 22 are views showing a seat structure using a pelvis support member 252 and the like according to another example. This seat structure is a robust skeleton with a small amount of deformation of the skeleton itself, and is suitable for securing a space for people to enter. The pelvis support member 252 is formed in a substantially L-shaped cross section, and an outer surface groove 252m is formed in the width direction near the corner of the substantially L-shaped pelvis support member 252 as shown in FIG. The rear portion of the outer surface groove portion 252m is a thickened bulging portion 252n. A groove 252p that engages with the lower frame 250 is formed on the inner surface side of the bulging portion 252n.

  The pelvis support member 252 shown in FIGS. 19 to 22 is disposed such that the outer groove portion 252m is along the rear side of the connecting rod 295 between the recliners. In addition, since the outer surface groove portion 252m is arranged along the rear side of the connecting rod 295, it has the above-described bulged portion 252n. This bulged portion 252n functions as an elastic member for preventing damage to the connecting rod 295 when the wire is inserted and conveyed below the connecting rod 295.

  Further, an S spring 251 as a planar spring member is provided on the back surface of the front cover portion 252a. Both ends of the S spring 251 are locked to the inner surfaces of the side frames 210 and 220 of the seat back portion 200. Further, two metal oval support blocks 251a and 251a as block members are provided near each end. The elliptical support blocks 251a and 251a are arranged so that their arc portions are along the arc portion of the S spring 251, and the elliptical support blocks 251a and 251a are engaged with the S spring 251 by caulking. Since the elliptical support blocks 251a and 251a have a convex cross section projecting in the direction of the pelvis support member 252, the elliptical support blocks 251a and 251a are in contact with the back surface of the pelvis support member 252 with dots or lines. The elliptical support blocks 251a and 251a are preferably provided in a range of 150 to 250 mm so that the distance between them is 100 mm or more.

  When a large impact force is input and the human body tries to enter the intrusion space 260 of the back frame 200, the warped portion 252 b at the top of the pelvis support member 252 is pressed and pivots backward about the connecting rod 295. To do. Since the elliptical support blocks 251a and 251a are provided on the S spring 251 by caulking at a pitch of 100 mm or more, when a human body enters, a rotational force acts on the elliptical support blocks 251a and 251a and caulking. A tensile force acts on the part. This is because the movements of the S spring 251 and the elliptical support blocks 251a and 251a are different, but this action reduces the degree of engagement with the elliptical support blocks 251a and 251a ("the degree of engagement is reduced. “To do” means that the coupling force between the two is reduced, that is, the arc portions are shifted and the caulking portion is loosened, the engagement is released and the caulking portion is released, etc.) Further, the space further expands, and the pelvic support member 252 is driven backward and downward, thereby creating a space in which the human body can easily enter the intrusion space 260. When a larger impact force is input, since the elliptical support blocks 251a and 251a are engaged with the S spring 251 by caulking, the caulking portion is finally removed. Thereby, the elliptical support blocks 251a and 251a are detached from the S spring 251. Then, since the elliptical support blocks 251a and 251a are convex, the oval support blocks 251a and 251a are dropped, so that the space corresponding to the height corresponding to the convex shape is further expanded, and the pelvic support member 252 is Further, it is displaced downward in the rear direction. This further reduces the impact force. Further, when the elliptical support blocks 251a and 251a drop off, the impact force is further relaxed by the spring characteristics of the S spring 251 and the human body easily enters the intrusion space 260 of the back frame 200. In this way, the impact force is attenuated. In a normal use state where no impact force is applied, the intrusion amount of the human back frame 200 into the intrusion space 260 is small, and the S spring 251 and the elliptical support blocks 251a and 251a are displaced in the same manner. Since the shearing force acts on the caulking portion, the caulking portion does not loosen.

  As described above, according to the pelvic support member 252, the S spring 251, and the elliptical support blocks 251 a and 251 a shown in FIGS. 19 to 22, the buffer function is enhanced more than the pelvis support member 252 shown in FIGS. 1 to 7. Can do.

DESCRIPTION OF SYMBOLS 1 Seat structure 10 Seat cushion part 100 Cushion frame 110,120 Side frame 130 Front frame 131 Horizontal part 132 1st arm part 140 Rear part frame 141 Horizontal part 142 2nd arm part 150 1st torsion bar 160 2nd torsion bar 170 Cushion Base net for cushion 180 Surface cushion material for cushion 183 Three-dimensional knitted fabric 184 Bead foam 20 Seat back part 200 Back frame 210, 220 Side frame 230 First upper frame 240 Second upper frame 250 Lower frame 251 S spring 252 Pelvic support member 260 Intrusion space 270 Base net for back 280 Fixed pad for back 290 Movable pad for back 291,292 Shoulder rib support part 300 Back skin material

Claims (17)

A seat structure comprising a seat cushion part and a seat back part connected to the seat cushion part via a recliner part,
The seat cushion part is
A pair of side frames;
A front frame elastically supported by a first torsion bar spanned between the front portions of the pair of side frames;
A rear frame elastically supported by a second torsion bar spanned between the rear portions of the pair of side frames;
A cushion base net spanned between the front frame and the rear frame,
The front frame has a first arm portion extending in a direction protruding upward with respect to a position where the first torsion bar is disposed when no load is applied, and the rear frame is the second torsion when unloaded. It has a second arm portion extending in a direction protruding upward with respect to the bar arrangement position, and the length of the first arm portion is longer than the length of the second arm portion. Seat structure to play. The seat back portion includes a pair of side frames and a base net for the back spanned between the pair of side frames,
A pair of side frames of the seat cushion part are respectively supported by a pair of slide adjusters, a rear part bulges upward, and a rear part is connected to a lower part of the side frame in the seat back part via the recliner part,
The seat cushion portion further includes:
A front stabilizer spanned between the front-side portions of the pair of side frames;
A first bracket for adhering at least a part to each slide adjuster on the inner side between the front portions of each side frame, and supporting each of the front stabilizers;
An upper plate located in the vicinity of each recliner portion and a lower plate extending downward from the upper plate are integrally formed, and the lower plate is adjacent to a rear reinforcing frame spanned between the rear portions of the pair of side frames. The seat structure according to claim 1, further comprising a second bracket arranged side by side.   Each of the first brackets is fixed to the front stabilizer so that the lower end is fixed to the slide adjuster and the upper end has a predetermined gap with each side frame of the adjacent seat back portion. The seat structure according to claim 2.   The seat structure according to claim 2 or 3, wherein the second bracket is partially fixed to each adjacent side frame.   Each side frame of the said seat cushion part is a seat structure of any one of Claims 1-4 currently formed by the closed cross-section structure which made two sheet | seats oppose and integrated by hemming process.   The seat structure according to any one of claims 1 to 5, wherein a peripheral edge of each side frame of the seat cushion portion is heat-treated.   7. The rear stabilizer is spanned between a portion of the seat cushion portion that is forward of the second torsion bar and closer to the rear than the middle in the longitudinal direction of the pair of side frames. The seat structure according to claim 1.   The seat structure according to claim 7, wherein the rear stabilizer is arranged so as to span between the vicinity of seat belt attachment portions in the pair of side frames.   The seat structure according to any one of claims 5 to 8, wherein each of the front stabilizer and the rear stabilizer is connected to each other through a side frame formed in a closed cross-sectional structure from the thin plate. .   The seat structure according to any one of claims 2 to 9, wherein the first bracket and the second bracket are made of high-tensile steel.   The seat structure according to claim 10, wherein a yield stress of the high-strength steel forming the first bracket and the second bracket is 600 MPa or more. The back frame is engaged with at least a part of the planar spring member spanned in the width direction at a position below the vertical center of the pair of side frames, and the planar spring member. A block member having a convex cross-section projecting forward from the member;
The seat according to any one of claims 1 to 11, wherein when the human body enters the back frame under an impact force, the degree of engagement between the block member and the planar spring member decreases. Construction.   The seat structure according to claim 12, wherein two block members are attached to the planar spring member at an interval of 100 mm or more.   The seat structure according to claim 12 or 13, wherein the planar spring member is an S spring.   The seat structure according to any one of claims 12 to 14, wherein the block member is formed in a substantially oval shape, and the arc portion of the block member and the arc portion of the S spring are made to coincide with each other by caulking.   It further includes a pelvic support member having a front surface covering portion that covers the front surface of the planar spring member and the block member, and when the front surface covering portion is pressed rearward, the pelvis support member rotates backward, The seat structure according to any one of claims 12 to 15, wherein a degree of engagement between the block member and the planar spring member is reduced.   The seat cushion portion is provided on the cushion base net by dividing the cushion surface layer cushion material into a plurality of layers, and covering the upper surface of the cushion surface layer cushion material with a skin material, and adjacent to the plurality of segments. The seat structure according to any one of claims 1 to 16, wherein the skin material is connected to the cushion base net by sewing between the cushion surface cushion materials to be cushioned.

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