Vehicle seats

Abstract

To provide a vehicle seat that is prevented from being increased in size while appropriately absorbing an impact generated on a seated occupant when an impact such as a collision occurs.SOLUTION: A vehicle seat S is provided with a seat cushion S1. The seat cushion S1 includes a seat cushion pad S11 and an impact absorbing member 20 disposed below the cushion pad S11. A plurality of recessed portions 25a, 26a, 25b, 26b are disposed in the impact absorbing member 20. The plurality of recessed portions 25a, 26a, 25b, 26b includes first recessed portions 25a, 25b and second recessed portions 26a, 26b arranged in order in the seat width direction from the center C of the impact absorbing member 20 toward outer end portions 24a, 24b. A distance L1 between the first recessed portions 25a, 25b and the center C is longer than a distance L2 between the second recessed portions 26a, 26b and the outer end portions 24a, 24b in the seat width direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of absorbing shock applied to a seated occupant when an impact such as a collision occurs. [Background technology]

[0002] When a moving vehicle crashes head-on, the body of the seated occupant (passenger) may slide forward and downward on the surface of the seat while restrained by the seat belt, resulting in a "submarine" phenomenon. As a measure to suppress the submarine phenomenon, for example, as described in Patent Document 1, a vehicle seat is known in which a cross member is placed across the width of the seat cushion at the midpoint in the front-rear direction of the frame part of the seat cushion, so that when the buttocks of the occupant try to move forward during sudden deceleration, the reclining part is stretched to suppress the occupant from moving forward, as described in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-46513 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle seat described in Patent Document 1, the cross member serving as an impact absorbing member is positioned on top of the seat cushion frame, specifically, on top of the seat cushion side frame, which required the width of the seat cushion frame to be large.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a vehicle seat that is small in size while adequately absorbing the impact that occurs to the seated occupant when an impact such as a collision occurs. [Means for solving the problem]

[0006] The above problem is solved by a vehicle seat according to the present invention, which provides a vehicle seat including a seat cushion, the seat cushion including a seat cushion pad and an impact absorbing member provided below the seat cushion pad, the impact absorbing member being provided with a plurality of recesses, the plurality of recesses including a first recess and a second recess arranged in order from a center of the impact absorbing member toward an outer end in a width direction of the vehicle seat, the impact absorbing member being provided with a groove portion extending in a front-rear direction of the vehicle seat, the recess portion being arranged so as to overlap with the groove portion at a position between a front end and a rear end of the groove portion in the front-rear direction of the vehicle seat, In a width direction of the vehicle seat, a distance between the first recess and the center is longer than a distance between the second recess and the outer end. This is solved by:

[0007] In the vehicle seat of the present invention configured as described above, when a load is applied to the impact absorbing member, the first recess on the inside in the width direction of the vehicle seat receives the load at the ischial region, and then the second recess on the outside buckles so as to fall outward, thereby making it possible to make the impact absorption constant and appropriately absorb the impact. Furthermore, by providing the impact absorbing member with multiple recesses in a predetermined arrangement, it is possible to appropriately absorb the impact while suppressing an increase in size. In addition, by improving the strength of the impact absorbing member in the width direction (left-right direction) of the vehicle seat, the recess is prevented from collapsing when a load is applied in the width direction (left-right direction, i.e., the direction perpendicular to the groove portion). 。

[0008] In the above configuration, the first recess and the second recess may be disposed symmetrically across the center of the impact absorbing member in the width direction of the vehicle seat. With the above-described configuration, when a load is applied to the impact absorbing member, it is possible to absorb the impact in the width direction (left-right direction) of the vehicle seat in a well-balanced manner.

[0009] In the above configuration, it is preferable that a distance between the first recess and the center of the impact absorbing member in a width direction of the vehicle seat is shorter than a distance between the first recess and the second recess. With the above-mentioned configuration, it is possible to make the shock absorption constant when a load is applied to the shock absorbing member.

[0011] In the above configuration, the recess may be biased toward a position closer to either the front end or the rear end of the groove in the front-rear direction of the vehicle seat. With the above-mentioned configuration, when a load is applied to the impact absorbing member, the impact can be appropriately absorbed.

[0012] In the above configuration, the recess may be biased toward a position closer to the front end of the groove in the front-rear direction of the vehicle seat. With the above-described configuration, when a load is applied to the impact absorbing member, the impact can be appropriately absorbed in the front.

[0013] In the above configuration, the recess may be provided on the lower surface of the impact absorbing member so as to overlap with the groove at a position between the front end and the rear end of the groove. In the above-described configuration, when a load is applied to the impact absorbing member, the impact can be appropriately absorbed on the lower surface side.

[0014] In the above configuration, the groove may extend from a front end region to a rear end region of the impact absorbing member in a front-rear direction of the vehicle seat. With the above-described configuration, when a load is applied to the impact absorbing member, the impact can be more appropriately absorbed on the lower surface side.

[0015] In addition, in the above configuration, another groove portion different from the groove portion is provided on the upper surface of the impact absorbing member, the other groove portion extending in the fore-and-aft direction of the vehicle seat, and the other groove portion is provided on the upper surface of the impact absorbing member so as to connect only to the front end of the recess. In the above configuration, by improving the strength of the impact absorbing member in the width direction (left-right direction) of the vehicle seat on the upper surface side, the recess is prevented from collapsing when a load is applied in the width direction (left-right direction).

[0016] In the above configuration, the seat cushion may have a seat cushion frame that serves as a skeleton, the seat cushion pad placed on the seat cushion frame, and a trim cover that covers the seat cushion pad. The above configuration provides a vehicle seat equipped with a seat cushion that can make the shock absorption constant and appropriately absorb the shock when a load is applied to the shock absorbing member. Effect of the Invention

[0017] According to the vehicle seat of the present invention, when a load is applied to the shock absorbing member, the first recess on the inside in the width direction of the vehicle seat receives the load at the ischial region, and then the second recess on the outside buckles so as to fall outward, thereby making it possible to make the shock absorption constant and appropriately absorb the shock. Furthermore, by providing the shock absorbing member with multiple recesses in a predetermined arrangement, it is possible to appropriately absorb the shock while suppressing an increase in size. Furthermore, according to the vehicle seat of the present invention, when a load is applied to the impact absorbing member, it is possible to absorb the impact in the width direction (left and right direction) of the vehicle seat in a well-balanced manner. Furthermore, according to the vehicle seat of the present invention, it is possible to make the impact absorption constant when a load is applied to the impact absorbing member. In addition, according to the vehicle seat of the present invention, by improving the strength of the impact absorbing member in the width direction (left-right direction) of the vehicle seat, the recess is prevented from collapsing when a load is applied in the width direction (left-right direction). Furthermore, according to the vehicle seat of the present invention, when a load is applied to the impact absorbing member, it is possible to appropriately absorb the impact. Furthermore, according to the vehicle seat of the present invention, when a load is applied to the impact absorbing member, it is possible to appropriately absorb the impact in the front. Furthermore, according to the vehicle seat of the present invention, when a load is applied to the impact absorbing member, the impact can be appropriately absorbed on the lower surface side. Furthermore, according to the vehicle seat of the present invention, when a load is applied to the impact absorbing member, the impact can be absorbed more appropriately on the lower surface side. In addition, according to the vehicle seat of the present invention, by improving the strength of the impact absorbing member in the width direction (left-right direction) of the vehicle seat on the upper surface side, the recess is prevented from collapsing when a load is applied in the width direction (left-right direction). Furthermore, according to the vehicle seat of the present invention, a vehicle seat is provided that is equipped with a seat cushion that can stabilize the impact absorption and appropriately absorb the impact when a load is applied to the impact absorbing member. [Brief description of the drawings]

[0018] [Figure 1] 1 is an external view of a vehicle seat according to an embodiment of the present invention; [Diagram 2] 3 is a schematic external view showing the position of an impact absorbing member provided in the vehicle seat according to the embodiment of the present invention. FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, illustrating a structure around an impact absorbing member provided in the vehicle seat according to the embodiment of the present invention. [Figure 4] 2 is a perspective view of an impact absorbing member provided in the vehicle seat according to the embodiment; FIG. [Diagram 5] 2 is a top view of an impact absorbing member provided in the vehicle seat according to the embodiment; FIG. [Figure 6] 4 is a bottom view of the impact absorbing member included in the vehicle seat according to the embodiment. FIG. [Figure 7] 2 is a front view of an impact absorbing member provided in the vehicle seat according to the embodiment; FIG. [Figure 8] 4 is a rear view of the impact absorbing member provided in the vehicle seat according to the embodiment. FIG. [Figure 9] 6 is a cross-sectional view taken along the line BB in FIG. 5, and is a schematic diagram showing an example of the internal structure of the impact absorbing member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A vehicle seat according to an embodiment of the present invention (hereinafter, the present embodiment) will be described below with reference to Fig. 1 to Fig. 9. As the vehicle seat according to the present embodiment, a rear seat for a vehicle mounted on a vehicle will be described as an example, but the vehicle seat is not limited to a rear seat for a vehicle mounted on a ground-traveling vehicle having wheels such as an automobile or a train, and may be a front seat for a vehicle, a second-row seat of a three-row seat, or a seat mounted on an aircraft or a ship that moves other than on the ground.

[0020] The embodiment described below is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, and other aspects of the components described below may be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

[0021] In this specification, the terms indicating directions are defined as shown in FIG. 1. Specifically, in the following description, the "front-rear direction" means the front-rear direction as seen by a person sitting in the vehicle seat, and is the direction that coincides with the vehicle's traveling direction. The "seat width direction" means the width direction of the vehicle seat, and coincides with the left-right direction as seen by a person sitting in the vehicle seat. Additionally, the "up-down direction" means the height direction of the vehicle seat, and coincides with the up-down direction as seen by the vehicle seat from the front.

[0022] [1. Configuration of the vehicle seat S] The vehicle seat S according to this embodiment has the appearance shown in Fig. 1. In Fig. 1, a part of the vehicle seat S (specifically, a front corner portion of the seat cushion S1) is shown with the trim cover S12 removed for convenience of illustration.

[0023] The vehicle seat S has as its main components a seat cushion S1 which serves as the seating portion that supports the buttocks of the seated occupant, a seat back S2 which serves as the backrest that supports the back of the seated occupant, and a headrest S3 which is disposed on top of the seat back S2 and supports the head of the seated occupant.

[0024] The seat cushion S1 is constructed by placing a seat cushion pad S11 on a seat cushion frame, which serves as a framework, and further covering the seat cushion pad S11 with a trim cover S12. As shown in Fig. 2, the seat cushion frame has a seat cushion side frame S14. The seat back S2 is constructed by placing a cushion pad (not shown) on a seat back frame (not shown), and covering the cushion pad with the trim cover S12. The headrest S3 is formed by disposing a pad material (not shown) on a core material (not shown), and covering the pad material with the trim cover S12.

[0025] The seat cushion pad S11 of the seat cushion S1 and the seat back pad of the seat back S2 are made of a urethane base material formed by foam molding using a urethane foaming material. The trim cover S12 of the seat cushion S1 is provided with a first hanging part T1 (right hanging part) that is provided on the right side of the seat cushion and extends in the front-rear direction, a second hanging part T2 (left hanging part) that is provided on the left side of the seat cushion and extends in the front-rear direction, and a third hanging part T3 (rear hanging part) that is provided on the rear side of the seat cushion and extends in the seat width direction. In addition, thin-walled parts that are thinner than the surroundings are provided at positions corresponding to the hanging parts T1 to T3 of the seat cushion pad S11.

[0026] [2. Seat cushion of this embodiment] The configuration of the seat cushion S1 of the vehicle seat S according to this embodiment will be described with reference to Fig. 3 to Fig. 9. Note that the trim cover S12 is omitted in Fig. 3. As shown in Fig. 3, which is a cross-sectional view taken along line AA in Fig. 1, an impact absorbing member 20 is provided below the seat cushion pad S11. As shown in Figs. 4 to 9, the impact absorbing member 20 is provided with a plurality of recesses (a first upper recess 25a, a second upper recess 26a, a first lower recess 25b, and a second lower recess 26b, which will be described later) between an upper surface 21 and a lower surface 22.

[0027] The impact absorbing member 20 is disposed inward of a pair of seat cushion side frames S14 spaced apart from each other in the seat width direction (FIG. 2). More specifically, the impact absorbing member 20 is disposed below the seat cushion pad S11 and at a substantially central position between the pair of seat cushion side frames S14 in the seat width direction (FIG. 2). The seat cushion side frames S14 are not limited to plate-shaped members, and may be made of pipes. Also, the impact absorbing member 20 may be a portion provided on the left and right in the seat width direction when a pipe is bent into a frame shape.

[0028] The shock absorbing member 20 is a hollow blow molded product, and is harder than the seat cushion pad S11, which is a urethane pad, and is formed so as to collapse and absorb shock when a certain load value is exceeded.

[0029] The lower surface 22 of the impact absorbing member 20 is supported from below by a plate-like member 10, which is a support member. The plate-like member 10 is a plate-like member that constitutes a floor that supports a rear seat for a vehicle from below, and the impact absorbing member 20 is placed on a flat portion 11. In addition, a protrusion 12 (front position restriction portion) that protrudes upward from the flat portion 11 is formed at the front end of the plate-like member 10.

[0030] The plate-like member may be a part of the seat cushion frame, and the material is not limited to metal and may be a member made of resin. Also, the support member does not have to be a plate-like member, and may be, for example, a linear member such as an S-spring or wire, or a planar elastic body such as a cloth-like support member, as long as it can support the impact absorbing member. By adopting such a structure, it is possible to support the impact absorbing member with a simple structure.

[0031] The front surface 23a of the shock absorbing member 20 abuts against the protruding portion 12. Since the front surface 23a of the shock absorbing member 20 is supported by the protruding portion 12 from the front, the shock absorbing effect is stably exhibited.

[0032] 3, the seat cushion pad S11 has a pad recess S11b formed on its lower surface S11a, which is recessed upward. At least a part of the upper surface 21 of the impact absorbing member 20 is stored in the pad recess S11b of the seat cushion pad S11, so that the position of the impact absorbing member 20 relative to the seat cushion pad S11 is stable.

[0033] The upwardly protruding portion 12 (front position restriction portion) extends in the seat width direction and functions as a sinking suppression member for suppressing the submarine phenomenon in which the body of an occupant seated in the vehicle seat S slides forward and downward when the vehicle crashes head-on. The impact absorbing member 20 is disposed rearward of the protruding portion 12 extending in the seat width direction, and therefore the effect of the protruding portion 12 is suppressed when the load during impact absorption is transmitted to the impact absorbing member 20. The sinking suppression member may be a pipe member (e.g., a submarine pipe) extending in the seat width direction near the front end of the seat.

[0034] In addition, no metal member such as a seat frame member is disposed between the upper surface 21 of the impact absorbing member 20 and the lower surface S11a of the seat cushion pad S11. Since no metal member is disposed between the impact absorbing member 20 and the seat cushion pad S11 above, the load from the occupant is stably transmitted to the impact absorbing member 20.

[0035] 4 to 9, the impact absorbing member 20 has a hollow shape surrounded by an upper surface 21 and a lower surface 22 in the vertical direction, a front surface 23a and a rear surface 23b in the front-rear direction, and a first side surface 24a (right side surface) and a second side surface 24b (left side surface) in the seat width direction. The upper surface 21 of the impact absorbing member 20 is formed with an inclined surface 21a that is inclined downward toward the rear. The front surface 23a of the impact absorbing member 20 is inclined toward the rear from the middle region in the vertical direction to the upper region.

[0036] The upper surface 21 side of the impact absorbing member 20 is provided with a first upper recess 25a and a second upper recess 26a recessed downward (FIG. 5). Also, the lower surface 22 side of the impact absorbing member 20 is provided with a first lower recess 25b and a second lower recess 26b recessed upward (FIG. 6). More specifically, the upper surface 21 side of the impact absorbing member 20 is provided with a first upper recess 25a and a second upper recess 26a opening upward (FIG. 5), and the lower surface 22 side of the impact absorbing member 20 is provided with a first lower recess 25b and a second lower recess 26b opening downward (FIG. 6).

[0037] The first upper recess 25a and the second upper recess 26a are substantially circular in a top view of the impact absorbing member 20. The first lower recess 25b and the second lower recess 26b are substantially circular in a bottom view of the impact absorbing member 20. The first upper recess 25a and the second upper recess 26a are gradually reduced in diameter from the inclined surface 21a to the bottom surface 22 (see FIG. 9 described later). The first lower recess 25b and the second lower recess 26b are gradually reduced in diameter from the bottom surface 22 to the inclined surface 21a (see FIG. 9 described later).

[0038] 4 and 5, the inclined surface 21a on the upper surface 21 side of the impact absorbing member 20 has two first upper recesses 25a and two second upper recesses 26a arranged in order from the center C of the impact absorbing member 20 toward the outer end (the first side surface 24a or the second side surface 24b) in the seat width direction. Here, the center C of the impact absorbing member 20 means the center position in the seat width direction, corresponds to the center line when viewed from above and below, and corresponds to the center line when viewed from the front and rear.

[0039] 5 and 8, in the sheet width direction, the distance L1 between the first upper recess 25a and the center C is longer than the distance L2 between the second upper recess 26a and the first side surface 24a or the second side surface 24b, which is the outer end closer to the second upper recess 26a (L1>L2). Here, the reference for the distance L1 and the distance L2 is the center of the approximately circular shape in top view for the first upper recess 25a and the second upper recess 26a.

[0040] Specifically, the distance L1 between the first upper recess 25a and the center C is the distance between the center of the generally circular shape of the first upper recess 25a in top view and a plane that includes the center C as a center line and is perpendicular to the sheet width direction (left-right direction). Similarly, the distance L2 between the second upper recess 26a and the first side surface 24a (or the second side surface 24b) is the distance between the center of the generally circular shape of the first upper recess 25a in top view and the outer end of the first side surface 24a (or the second side surface 24b) in the sheet width direction.

[0041] As shown in Figure 6, the underside 22 of the impact absorbing member 20 is formed with a first lower recess 25b and a second lower recess 26b, which are arranged in order from the center C of the impact absorbing member 20 toward the outer end (the first side surface 24a or the second side surface 24b) in the seat width direction.

[0042] At this time, as shown in Figure 6, in the sheet width direction, the distance L1 between the first lower recess 25b and the center C is longer than the distance L2 between the first side surface 24a or the second side surface 24b, which is the outer end closer to the second lower recess 26b.

[0043] As described above, in the sheet width direction, since the positional relationship of the respective concave portions of the shock absorbing member 20 is L1 > L2, when a load is applied to the shock absorbing member 20, the inner first concave portions (the first upper concave portion 25a and the first lower concave portion 25b) receive the load in the ischial region, and then the outer second concave portions (the second upper concave portion 26a and the second lower concave portion 26b) buckle so as to fall outward, making it possible to equalize shock absorption.

[0044] As shown in FIGS. 4 and 5, the first upper concave portion 25a (the first concave portion) and the second upper concave portion 26a (the second concave portion) are symmetrically arranged with the center C of the shock absorbing member 20 interposed therebetween in the sheet width direction. Further, as shown in FIG. 6, the first lower concave portion 25b (the first concave portion) and the second lower concave portion 26b (the second concave portion) are symmetrically arranged with the center C of the shock absorbing member 20 interposed therebetween in the sheet width direction. Thus, since the inner first concave portion and the outer second concave portion are symmetrically arranged with the center C of the shock absorbing member 20 interposed therebetween, when a load is applied to the shock absorbing member 20, it is possible to perform shock absorption in the sheet width direction (left - right direction) in a well - balanced manner.

[0045] As shown in FIGS. 5 and 8, in the sheet width direction, the distance L1 between the first upper concave portion 25a (the first concave portion) and the center C is shorter than the distance L3 between the first upper concave portion 25a (the first concave portion) and the second upper concave portion 26a (the second concave portion) on the side closer to the first upper concave portion 25a. Further, as shown in FIG. 6, in the sheet width direction, the distance L1 between the first lower concave portion 25b (the first concave portion) and the center C is shorter than the distance L3 between the first lower concave portion 25b (the first concave portion) and the second lower concave portion 26b (the second concave portion) on the side closer to the first upper concave portion 25a.

[0046] As described above, in the sheet width direction, since the positional relationship of the respective concave portions of the shock absorbing member 20 is L1 < L3, when a load is applied to the shock absorbing member 20, it is possible to equalize shock absorption by the inner first concave portions (the first upper concave portion 25a and the first lower concave portion 25b) and the outer second concave portions (the second upper concave portion 26a and the second lower concave portion 26b).

[0047] 4 and 5, a first upper groove portion 21b serving as an inner groove portion recessed downward and a second upper groove portion 21c serving as an outer groove portion are provided on the upper surface 21 of the impact absorbing member 20. As shown in Fig. 5, the first upper groove portion 21b extends in the front-rear direction between its front end 21b1 and rear end 21b2, and the second upper groove portion 21c extends in the front-rear direction between its front end 21c1 and rear end 21c2.

[0048] The first upper recess 25a (first recess) has a front end 25a1 and a rear end 25a2 as ends in the front-rear direction. The front end 25a1 of the first upper recess 25a is connected to the rear end 21b2 of the first upper groove 21b. The depth of the first upper groove 21b is formed to be shallower than the depth of the first upper recess 25a (first recess). In addition, in the seat width direction, the center of the first upper recess 25a coincides with the center of the first upper groove 21b (FIG. 5).

[0049] The second upper recess 26a (second recess) has a front end 26a1 and a rear end 26a2 as ends in the front-rear direction. The front end 26a1 of the second upper recess 26a is connected to the rear end 21c2 of the second upper groove 21c. The depth of the second upper groove 21c is formed shallower than the depth of the second upper recess 26a (second recess). In addition, in the seat width direction, the center of the second upper recess 26a coincides with the center of the second upper groove 21c (FIG. 5).

[0050] That is, on the upper surface 21 of the shock absorbing member 20, the first upper groove portion 21b and the second upper groove portion 21c are provided so as to connect only to the front ends (front ends 25a1 and 26a1) of the recesses (first upper recess 25a and second upper recess 26a). Specifically, on the upper surface 21 of the shock absorbing member 20, the rear end 21b2 of the first upper groove portion 21b is provided so as to connect only to the front end 25a1 of the first upper recess 25a, and the rear end 21c2 of the second upper groove portion 21c is provided so as to connect only to the front end 26a1 of the second upper recess 26a. With this configuration, the strength of the shock absorbing member 20 in the seat width direction (left-right direction) is improved on the side of the upper surface 21, thereby suppressing the collapse of each recess when a load is applied in the width direction (left-right direction).

[0051] As shown in Fig. 6, a first lower groove 22b as an inner groove recessed upward and a second lower groove 22c as an outer groove are provided on the lower surface 22 of the impact absorbing member 20. As shown in Fig. 6, the first lower groove 22b extends in the front-rear direction between its front end 22b1 and its rear end 22b2, and the second lower groove 22c extends in the front-rear direction between its front end 22c1 and its rear end 22c2.

[0052] The first lower recess 25b (first recess) has a front end 25b1 and a rear end 25b2 as ends in the front-rear direction. The first lower recess 25b is connected between the front end 22b1 and the rear end 22b2 of the first lower groove 22b. The depth of the first lower groove 22b is shallower than the depth of the first lower recess 25b (first recess). In the seat width direction, the center of the first lower recess 25b coincides with the center of the first lower groove 22b (FIG. 6).

[0053] The second lower recess 26b (second recess) has a front end 26b1 and a rear end 26b2 as ends in the front-rear direction. The second lower recess 26b is connected between the front end 22c1 and the rear end 22c2 of the second lower groove 22c. The depth of the second lower groove 22c is formed shallower than the depth of the second lower recess 26b (second recess). In addition, in the seat width direction, the center of the second lower recess 26b coincides with the center of the second lower groove 22c (FIG. 6).

[0054] That is, in the lower surface 22 of the shock absorbing member 20, each recess (first lower recess 25b and second lower recess 26b) is provided so as to overlap with each groove portion at a position between the front end (front end 22b1 and front end 22c1) and the rear end (rear end 22b2 and rear end 22c2) of each groove portion (first lower groove portion 22b and second lower groove portion 22c). With such a configuration, when a load is applied to the shock absorbing member 20, it becomes possible for the lower surface 22 side to appropriately absorb the shock.

[0055] In addition, in the front-rear direction, each recess (first lower recess 25b and second lower recess 26b) may be biased toward a position closer to either one of the front end (front end 22b1 and front end 22c1) and the rear end (rear end 22b2 and rear end 22c2) of each groove (first lower groove 22b and second lower groove 22c). With this configuration, it becomes possible to appropriately absorb the impact when a load is applied to the impact absorbing member 20.

[0056] 6, the recesses (first lower recess 25b and second lower recess 26b) are biased toward the front ends (front ends 22b1 and 22c1) of the grooves (first lower groove 22b and second lower groove 22c) in the front-rear direction. With this configuration, when a load is applied to the shock absorbing member 20, the shock can be appropriately absorbed in the front.

[0057] Moreover, each groove (first lower groove 22b and second lower groove 22c) extends from the front end region of the front surface 23a to the rear end region near the rear surface 23b in the front-rear direction of the impact absorbing member 20. With this configuration, when a load is applied to the impact absorbing member 20, the impact can be more appropriately absorbed on the lower surface 22 side.

[0058] 9, the upper bottom surface 25c of the first upper recess 25a on the upper surface 21 side and the lower bottom surface 25d of the first lower recess 25b on the lower surface 22 side are in contact with each other in the up-down direction. The contact between the upper bottom surface 25c and the lower bottom surface 25d improves rigidity, thereby improving the impact absorption efficiency.

[0059] As shown in Fig. 9, inside the impact absorbing member 20, a first space K1 is formed in front of each recess, and a second space K2 is formed behind each recess. The front first space K1 is provided with a larger volume and height than the rear second space K2. Due to the difference in size between the first space K1 and the second space K2, the impact absorbing member 20 is more flexible in the front and rear, improving the impact absorption efficiency. The front first space K1 may be provided with a smaller volume and height than the rear second space K2.

[0060] The seat cushion pad S11 is covered with a trim cover S12 as a skin material, but the impact absorbing member 20 and each recess are arranged at a position avoiding each hanging portion T1 to T3 of the trim cover S12. Specifically, in a top view of the seat cushion S1, the impact absorbing member 20 and each recess are arranged between the first hanging portion T1 (right hanging portion) and the second hanging portion T2 (left hanging portion) in the seat width direction, and arranged forward of the third hanging portion T3 (rear hanging portion) in the front-rear direction. With this configuration, the influence of each hanging portion T1 to T3 is suppressed when a load is transmitted to the impact absorbing member 20 during impact absorption.

[0061] [3. Modifications] The present invention is not limited to the above embodiment. For example, in the above embodiment, two recesses and two grooves are provided on both sides of the center C, but the number of recesses or grooves can be three or more.

[0062] In the above embodiment, the upper bottom surface 25c and the lower bottom surface 25d are in contact with each other in the vertical direction, but the upper bottom surface 25c and the lower bottom surface 25d may be spaced apart from each other in the vertical direction. That is, a gap (space portion) may be formed between the upper bottom surface 25c and the lower bottom surface 25d. By forming a gap by separating the upper bottom surface 25c and the lower bottom surface 25d in the vertical direction, the gap as the space portion functions as an elastic deformation area, making it easy to adjust the shock absorption.

[0063] In the above embodiment, the shape of each recess is substantially circular when viewed from above the impact absorbing member 20, but the shape of each recess is not limited to a circle and may be an ellipse or an oval when viewed from above the impact absorbing member 20. In this case, the distance L1 and the distance L2 may be calculated from the center of the ellipse or oval when viewed from above.

[0064] In the above embodiment, the first upper groove portion 21b and the second upper groove portion 21c are provided so as to connect only to the front ends (front ends 25a1 and 26a1) of the respective recesses (first upper recess 25a and second upper recess 26a). However, the first upper groove portion 21b and the second upper groove portion 21c may be provided so as to connect only to the front ends (front ends 25a1 and 26a1) of the respective recesses (first upper recess 25a and second upper recess 26a). It may extend rearward beyond the rear end (rear end 25a2, 26a2) of each recess (first upper recess 25a, second upper recess 26a).

[0065] The vehicle seat according to the present embodiment has been described above by taking a vehicle seat as an example. The seat cushion according to the present embodiment is not particularly limited in its use as long as it is a seat cushion for a seat on which an impact may be applied to a seat occupant, particularly a seat cushion for a seat on which a seat occupant may sink into the lumbar region when an impact occurs. For example, the seat cushion of the present invention can also be used as a seat cushion for a vehicle seat used in a vehicle other than a vehicle. [Explanation of symbols]

[0066] S Vehicle seats (vehicle seats) S1 Seat Cushion S11 seat cushion pad S11a bottom side S11b Pad recess S12 trim cover T1 First hanging part (right hanging part) T2 Second hanging part (left hanging part) T3 Third hanging part (rear hanging part) S14 Seat cushion side frame (side frame, seat cushion frame) S2 seat back S3 Headrest 10 Plate-shaped member (support member) 11 Flat area 12 Protrusion (sinking prevention member) 13 Forward bending part (bending part) 20. Shock absorbing materials 21 Top side 21a Slope 21b First upper groove portion (inner groove portion, other groove portion) 21b1 front end 21b2 rear end 21c 2nd upper groove (outer groove, other grooves) 21c1 front end 21c2 rear end 22 Bottom side 22b 1st lower groove (inner groove, groove) 22b1 front end 22b2 rear end 22c 2nd lower groove (outer groove, groove) 22c1 front end 22c2 rear end 23a front 23b Rear 24a 1st side (right side, outer end) 24b 2nd side (left side, outer end) 25a first upper recess (recess, first recess, inner recess) 25a1 front end 25a2 rear end 25c Upper bottom surface (bottom surface) 26a Second upper recess (recess, second recess, outer recess) 26a1 front end 26a2 rear end 25b First lower recess (recess, first recess, inner recess) 25b1 front end 25b2 rear end 25d Lower bottom surface (bottom surface) 26b Second lower recess (recess, second recess, outer recess) 26b1 front end 26b2 rear end C center K1 Front space K2 Rear space

Claims

1. A vehicle seat having a seat cushion, The seat cushion includes a seat cushion pad and an impact absorbing member provided below the seat cushion pad, The shock absorbing member is provided with a plurality of recesses, The plurality of recesses include first recesses and second recesses that are arranged in order from a center of the impact absorbing member toward an outer end in a width direction of the vehicle seat, The impact absorbing member is provided with a groove portion extending in a front-rear direction of the vehicle seat, the recess is provided so as to overlap with the groove portion at a position between a front end and a rear end of the groove portion in a front-rear direction of the vehicle seat, A vehicle seat, characterized in that in a width direction of the vehicle seat, a distance between the first recess and the center is longer than a distance between the second recess and the outer end portion.

2. The vehicle seat according to claim 1, wherein the first recess and the second recess are disposed symmetrically across the center of the impact absorbing member in a width direction of the vehicle seat.

3. The vehicle seat according to claim 2, characterized in that in the width direction of the vehicle seat, a distance between the first recess and the center of the impact absorbing member is shorter than a distance between the first recess and the second recess.

4. The vehicle seat according to any one of claims 1 to 3, characterized in that, in the fore-and-aft direction of the vehicle seat, the recess is biased toward a position closer to either one of the front end or the rear end of the groove portion.

5. 5. The vehicle seat according to claim 4, wherein the recess is biased toward a position closer to the front end of the groove in the front-rear direction of the vehicle seat.

6. The vehicle seat according to any one of claims 1 to 5, characterized in that the recess is provided on the underside of the impact absorbing member so as to overlap with the groove portion at a position between the front end and the rear end of the groove portion.

7. 7. The vehicle seat according to claim 6, wherein the groove portion extends from a front end region to a rear end region of the impact absorbing member in a front-rear direction of the vehicle seat.

8. A groove portion different from the groove portion is provided on an upper surface of the impact absorbing member, The other groove portion extends in a front-rear direction of the vehicle seat, 8. The vehicle seat according to claim 6, wherein the other groove is provided on the upper surface of the impact absorbing member so as to be connected only to a front end of the recess.

9. The seat cushion is The seat cushion frame forms the backbone of the seat. The seat cushion pad is placed on the seat cushion frame; and 9. The vehicle seat according to claim 1, further comprising: a trim cover that covers the seat cushion pad.

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