Vehicle seat with a seat cushion

Abstract

To provide a seat cushion with preferable seating feeling and a vehicular seat comprising the same.SOLUTION: A seat cushion S1 comprises: a first cushion layer 10; and a second cushion layer 20 arranged below the first cushion layer 10. The first cushion layer 10 has flexibility higher than that of the second cushion layer 20, the second cushion layer 20 has a first member 21 arranged on a region for supporting the hip D of a seater A, and the first member 21 is configured so that, an ischium portion 21a facing an ischium tuberosity P of the seater A has flexibility greater than that of a peripheral part of the ischium portion 21a. There is also provided a vehicular seat S comprising the seat cushion S1.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to , shi a vehicle seat provided with a seat cushion, and particularly relates to a vehicle seat with excellent seating comfort ta shi equipped with a seat cushion.

Background Art

[0002] Generally, in vehicle seats such as cars, ships, airplanes, etc., and chairs such as furniture, various proposals have been made to improve the seating comfort of the seat cushion that supports the buttocks and thighs of the seated person (passenger). Various techniques for improving the seating comfort of the seat cushion are known (for example, Patent Document 1).

[0003] The cushion pad of the vehicle seat described in Patent Document 1 includes a three-dimensional network elastic body disposed in an impregnated state inside a polyurethane foam. The three-dimensional network elastic body has a higher elastic modulus than the polyurethane foam and is disposed so as to avoid the portion that receives the ischial tuberosity of the seated person.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the cushion pad described in Patent Document 1, the portion with a high elastic modulus is disposed so as to avoid the portion that receives the ischial tuberosity of the seated person, and it is necessary to thicken the central portion of the urethane pad layer. When the urethane pad layer is configured to be thin, a feeling of having a bottom occurs and good seating cannot be obtained.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a seat cushion having a good sitting feeling and a vehicle seat including the seat cushion.

Means for Solving the Problems

[0007] According to the vehicle seat of the present invention, the problem is solved by a vehicle seat including a seat cushion, the seat cushion including a first cushion layer and a second cushion layer disposed below the first cushion layer, the first cushion layer being more easily deformable than the second cushion layer. covered by the skin material, The second cushion layer has a first member disposed in a region that supports the buttocks of the seated person. and a second member disposed in a region that supports the thigh portion of the seated person, The first member is such that the ischial region facing the ischial tuberosity of the seated person is more easily deformable than the peripheral region thereof. The seat cushion includes a seat cushion frame serving as a skeleton and a plate-shaped support member that supports the first member from below. The plate-shaped support member is provided avoiding the ischial region in a top view of the seat surface. , the first member is more flexible than the second member, and a sinking suppression member for suppressing the sinking of the seated person is provided below the second member, and the hanging portion of the skin material is disposed at a position avoiding the second member This solves the problem.

[0008] In the seat cushion of the present invention configured as described above, since the ischial region of the first member is more easily deformable than the peripheral region, the load from the portion corresponding to the ischial tuberosity of the seated person is released, resulting in a good sitting feeling. Also, even when the first cushion layer is configured to be thin, the occurrence of a feeling of having a bottom is suppressed. Also, since the first member that supports the buttocks is more flexible than the second member that supports the thigh portion of the seated person, the seating comfort is improved. Also, during a forward protrusion, when the seated person sinks downward, the second member abuts against the sinking suppression member, so the effect of suppressing the downward sinking of the seated person is improved. Also, the suspension wire disposed in the hanging portion is insert-molded into the first cushion layer, but the suspension is performed at a portion with a greater thickness where the second member is not disposed, so the suspension state is stabilized.

[0010] Also, in the above configuration, At the corresponding position of the plate-shaped support member in the ischial region in the vertical direction it is penetrating through preferably provided with a recess. In the above configuration, the recess releases the load from the portion corresponding to the ischial tuberosity of the seated person, resulting in good seating performance.

[0011] Further, in the above configuration, the first member is insert-molded in the urethane layer constituting the first cushion layer, and an impregnation suppression member for suppressing the impregnation of urethane may be provided at the ischial site. In the above configuration, since the flexibility can be changed by the change in the impregnation rate of urethane with respect to the first member, the degree of freedom in setting is improved.

[0012] Further, in the above configuration, a sensor for detecting the state of the seated person may be disposed on either the upper surface or the lower surface of the first member, and the sensor may be disposed so as to avoid the ischial site. In the above configuration, since the sensor is disposed so as to avoid the ischial site, the influence on the detection accuracy of the sensor can be suppressed.

[0013] Also, in the above configuration, the plate-shaped support member is locked to the seat cushion frame at the locking portion, and the locking portion may be provided avoiding the ischial region in the front-rear direction. In the above configuration, since the support member is locked to the seat cushion frame at the locking portion, the support stability is improved, the flexibility of the ischial region is not suppressed, and the support of the first member is also stabilized.

[0014] Also, in the above configuration, the plate-shaped support member is locked to the seat cushion frame at the locking portion, and the locking portion may be provided avoiding the ischial region in the left-right direction. 。 In the above configuration, When the support member is locked to the seat cushion frame at the locking portion, the support stability is improved, the flexibility of the ischial site is not suppressed, and the support of the first member is also stabilized.

[0016] Also, According to the vehicle seat of the present invention, the above problem is solved by a vehicle seat including a seat cushion, the seat cushion including a first cushion layer and a second cushion layer disposed below the first cushion layer. The first cushion layer is more flexible than the second cushion layer. The second cushion layer has a first member disposed in a region for supporting the buttocks of the seated person and a second member disposed in a region for supporting the thighs of the seated person. The first member is more flexible at the ischial region facing the ischial tuberosity of the seated person than at the peripheral region of the ischial region. The seat cushion includes a seat cushion frame serving as a skeleton and a plate-shaped support member that supports the first member from below. The plate-shaped support member is provided avoiding the ischial region in a top view of the seat surface. The first member is more flexible than the second member, and a sinking prevention member for suppressing the sinking of the seated person is provided below the second member. The second member is a three-dimensional network elastic body, and a blower may be provided below the second member. In the above configuration, Since the ischial region of the first member is more flexible than the peripheral region, the load from the portion corresponding to the ischial tuberosity of the seated person is released, resulting in a good sitting feeling. Also, even when the first cushion layer is configured to be thin, the feeling of having a bottom is suppressed. Further, since the first member that supports the buttocks of the seated person is more flexible than the second member that supports the thighs of the seated person, the seating comfort is good. Also, during a forward collision, when the seated person sinks downward, the second member abuts against the sinking prevention member, so the effect of suppressing the downward sinking of the seated person is improved. Also, Since the three-dimensional network elastic body easily allows air from the blower to pass through, if a blower is provided below the second member formed of the three-dimensional network elastic body, it is possible to reduce the ventilation grooves formed in the cushion layer.

[0018] Further, in the above configuration, the first cushion layer is covered with a skin material, and the suspension portion of the skin material may be disposed at a position avoiding the second member. In the above configuration, the suspension wire disposed in the suspension portion is insert-molded into the first cushion layer, but the suspension state is stabilized by performing the suspension at a portion having a greater thickness where the second member is not disposed. 。

Advantages of the Invention

[0019] According to the present invention, Vehicle seat since the ischial portion of the first member is more likely to bend than the peripheral portion, the load from the portion corresponding to the ischial tuberosity of the seated person is released, resulting in a good seating feeling. Further, even when the first cushion layer is configured to be thin, the occurrence of a bottoming feeling is suppressed. Also, according to the present invention, Vehicle seat since the first member that supports the buttocks is more likely to bend than the second member that supports the thigh portion of the seated person, the seating comfort is improved. Also, during a forward collision, when the seated person sinks downward, the second member abuts against the sinking prevention member, so the effect of suppressing the downward sinking of the seated person is improved. Also, according to the present invention, Vehicle seat since the recess releases the load from the portion corresponding to the ischial tuberosity of the seated person, the seating comfort is improved. Also, according to the present invention, Vehicle seat since it is possible to change the flexibility by changing the impregnation rate of urethane in the first member, the degree of freedom in setting is improved. Also, according to the present invention, Vehicle seat since the sensor is disposed avoiding the ischial portion, the influence on the detection accuracy of the sensor can be suppressed. Also, according to the vehicle seat of the present invention, since the support member is locked to the seat cushion frame at the locking portion, the support stability is improved, and the flexibility of the ischial portion is not suppressed, and the support of the first member is also stable. 。 Al However, according to the vehicle seat of the present invention, since the three-dimensional network elastic body easily allows air from the blower to pass through, if a blower is provided below the second member formed of the three-dimensional network elastic body, it is possible to reduce the ventilation grooves formed in the cushion layer. 。 AlAccording to the vehicle seat of the present invention, the suspension wire disposed in the suspension portion is insert-molded into the first cushion layer, and the suspension is performed at a portion where the thickness of the first cushion layer where the second member is not disposed is thicker, so that the suspension state is stabilized.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7A

Figure 7B

Figure 7C

Figure 8A

Figure 8B

Figure 8C

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0021] Hereinafter, with reference to FIGS. 1 to 12, a seat cushion and a vehicle seat according to the first to tenth embodiments (hereinafter, the present embodiments) of the present invention will be described. As the seat cushion and the vehicle seat according to the present embodiments, a vehicle seat mounted on a vehicle will be described as an example. However, it is not limited to a vehicle seat mounted on a ground vehicle having wheels such as an automobile or a railway, and may be a seat mounted on an aircraft or a ship that moves other than on the ground. Further, the seat cushion according to the present embodiment is not limited to the seat cushion of a vehicle seat, and may be a seat cushion that supports the buttocks and thighs of a seated person in a chair or a cushion such as furniture.

[0022] Note that the embodiments described below are merely examples for facilitating the understanding of the present invention and do not limit the present invention. That is, regarding the shape, dimensions, arrangement, etc. of the members described below, they can be changed and improved without departing from the gist of the present invention, and it goes without saying that equivalents thereof are included in the present invention.

[0023] Regarding the terms indicating directions in this specification, each direction is defined as shown in FIG. 1. Specifically, in the following description, the "front-rear direction" means the front-rear direction when viewed from the seated person of the vehicle seat, and is the direction that coincides with the traveling direction of the vehicle. The "seat width direction" means the lateral width direction of the vehicle seat and coincides with the left-right direction when viewed from the seated person of the vehicle seat. Further, the "up-down direction" means the height direction of the vehicle seat and coincides with the up-down direction when the vehicle seat is viewed from the front.

[0024] In addition, in this specification, the "hip point H (H-point)" refers to the center of rotation connecting the torso and the thigh F of the seated person A, as shown in FIG. 2. The area that supports the buttocks D of the seated person A means the area below the hip point H. Usually, the area that supports the buttocks D of the seated person A (the area below the hip point H) corresponds to the area behind the center of the seat cushion S1 in the front-rear direction of the seat. The "ischial tuberosity P" is the lowest part of the occupant's pelvis. Note that an AM50 type occupant dummy may be adopted as an example of the seated person A. Here, the AM50 type occupant dummy refers to an occupant dummy corresponding to the 50th percentile of American adult males as defined by US regulations (height 175 cm, seat height 88 cm, weight about 78 kg).

[0025] <Main components of the vehicle seat S> The vehicle seat S according to the present embodiment has the appearance shown in FIG. 1. In FIG. 1, a part of the vehicle seat S (specifically, the front end corner of the seat cushion S1) is shown with the trim cover T removed for illustration purposes.

[0026] The vehicle seat S mainly includes a seat cushion S1 that serves as a seating portion for supporting the buttocks D and thighs F of the seated person (occupant), a seat back S2 that serves as a backrest portion for supporting the back of the seated person, and a headrest S3 disposed above the seat back S2 for supporting the head of the seated person.

[0027] The seat cushion S1 is configured by placing a seat cushion pad CP on a seat cushion frame serving as a skeleton and further covering the seat cushion pad CP with a trim cover T. The seat back S2 is configured by placing a cushion pad (not shown) on a seat back frame (not shown) and covering it with a trim cover T. The headrest S3 is formed by arranging a pad material (not shown) on a core material (not shown) and covering it with a trim cover T.

[0028] The first cushion layer 10 of the seat cushion pad CP of the seat cushion S1 and the seat back pad of the seat back S2 are urethane base materials formed by foam molding using urethane foam. The trim cover T of the seat cushion S1 is provided with a first hanging portion T1 (right hanging portion) extending in the front-rear direction on the right side of the seat cushion, a second hanging portion T2 (left hanging portion) extending in the front-rear direction on the left side of the seat cushion, and a third hanging portion T3 (rear hanging portion) extending in the seat width direction on the rear side of the seat cushion. Further, hanging grooves M1 to M3 are provided at positions corresponding to the respective hanging portions T1 to T3 of the seat cushion pad CP (FIG. 12 described later).

[0029] As shown in FIG. 2, the seat cushion pad CP of the seat cushion S1 includes, in order from above, a first cushion layer 10 and a second cushion layer 20 disposed below the first cushion layer 10. The first cushion layer 10 (outer cushion member, upper cushion member) covers the upper surface 20a and the side surface of the second cushion layer 20 (inner cushion member, lower cushion member). The lower surface 10b of the first cushion layer 10 and the lower surface 20b of the second cushion layer 20 are supported from below by a support member SP. Further, the upper surface 10a and the side peripheral surface of the first cushion layer 10 are covered by a trim cover T.

[0030] Here, the first cushion layer 10 has a lower hardness and lower elasticity than the second cushion layer 20 and is easily bent (that is, the first cushion layer 10 has lower resilience). In other words, the second cushion layer 20 has a higher hardness and higher elasticity than the first cushion layer 10 and is difficult to bend (that is, the second cushion layer 20 has higher resilience).

[0031] While the first cushion layer 10 is a urethane base material formed by foam molding, the second cushion layer 20 can be formed from a three-dimensional network elastic body made of a thermoplastic polyester elastomer or the like, high-hardness urethane, expanded polypropylene (EPP), urethane rubber, an elastic body made of a synthetic resin such as a thermoplastic elastomer, and the like. Here, the three-dimensional network elastic body has air permeability due to being a network body, and when the volume of the second cushion layer 20 changes, it has a function of allowing air to pass through without retaining air inside, so it is suitable as a material constituting the second cushion layer 20.

[0032] As an example of the support member SP, as long as it is possible to support the seat cushion pad CP from below, it is not particularly limited, and examples include an S spring as a pressure-receiving member, a plate-like member made of resin or metal, a pan frame, a cloth-like support member (for example, a cloth-like elastic body), and the like.

[0033] And in the seat cushion pad CP of the present embodiment, as shown in FIG. 2, in the region that supports the buttocks D of the seated person A, the first member 21 that constitutes the second cushion layer 20 is arranged. In the first member 21, the ischial part 21a facing the ischial tuberosity P of the seated person A is formed to be more easily deflected than the peripheral part of the ischial part 21a.

[0034] Normally, the part facing the ischial tuberosity P of the seated person A sitting on the seating surface of the seat cushion S1 has the highest seating pressure, but since the ischial part 21a is formed to be more easily deflected than the peripheral part of the ischial part 21a, the seating pressure at the part where the seating pressure is the highest is reduced. Therefore, in the seat cushion S1, a good seating feeling can be obtained. Also, even when the first cushion layer 10 is configured to be thin, the occurrence of a feeling of having a bottom is suppressed.

[0035] [1. Seat Cushion of the First Embodiment] Referring to FIG. 3, the configuration of the seat cushion according to the first embodiment will be described. In FIG. 3, for the sake of explanation, the illustration of the configuration other than the seat cushion pad CP1 is omitted. The upper diagram of FIG. 3 corresponds to the cross-sectional view taken along line III-III of FIG. 1, and the lower diagram corresponds to the cross-sectional view taken along line IV-IV of FIG. 1.

[0036] As shown in FIG. 3, the second cushion layer 120 disposed below the first cushion layer 110 has a first member 121 disposed in a region that supports the buttocks D of the seated person A. The first member 121 is such that the ischial region 121a facing the ischial tuberosity P of the seated person A is more easily deflected than the peripheral region of the ischial region 121a.

[0037] Since the ischial region 121a of the first member 121 is more easily deflected than the peripheral region, it becomes possible to appropriately relieve the load applied from the portion of the buttocks D corresponding to the ischial tuberosity P of the seated person A. Therefore, in the seat cushion having the above configuration, a good sitting feeling can be obtained. Further, even when the first cushion layer 110 is configured to be thin, the occurrence of a feeling of having a bottom is suppressed.

[0038] [2. Seat Cushion of the Second Embodiment] Referring to FIG. 4, the configuration of the seat cushion according to the second embodiment will be described. In FIG. 4, for the sake of explanation, the illustration of the configuration other than the seat cushion pad CP2 is omitted. The upper diagram of FIG. 4 corresponds to the cross-sectional view taken along line III-III of FIG. 1, and the lower diagram corresponds to the cross-sectional view taken along line IV-IV of FIG. 1.

[0039] As shown in FIG. 4, the second cushion layer 220 disposed below the first cushion layer 210 has a first member 221 disposed in a region that supports the buttocks D of the seated person A and a second member 222 disposed in a region that supports the thighs F of the seated person A.

[0040] The first member 221 is such that the ischial portion 221a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral portion of the ischial portion 221a. Also, the first member 221 that supports the buttocks D is more flexible than the second member 222 that supports the thigh portion F.

[0041] Since the first member 221 that supports the buttocks D is more flexible than the second member 222 that supports the thigh portion F of the seated person A, it is possible to appropriately relieve the load applied from the region of the buttocks D while stably supporting the thigh portion F. Therefore, a good sitting feeling can be obtained with the seat cushion having the above configuration.

[0042] [3. Seat Cushion of the Third Embodiment] With reference to FIG. 5, the configuration of the seat cushion according to the third embodiment will be described. In FIG. 5, for the sake of explanation, the illustration of the configuration other than the seat cushion pad CP3 is omitted. The upper figure of FIG. 5 corresponds to the III-III cross-sectional view of FIG. 1, and the lower figure corresponds to the IV-IV cross-sectional view of FIG. 1.

[0043] As shown in FIG. 5, the second cushion layer 320 disposed below the first cushion layer 310 has a first member 321 disposed in a region that supports the buttocks D of the seated person A. The first member 321 is provided with a concave portion 321b in the ischial portion 321a facing the ischial tuberosity P of the seated person A, and the ischial portion 321a is more flexible than the peripheral portion of the ischial portion 321a.

[0044] By forming the concave portion 321b in the ischial portion 321a of the first member 321 so that it is more flexible than the peripheral portion, it becomes possible to appropriately relieve the load applied from the region of the buttocks D corresponding to the ischial tuberosity P of the seated person A. Therefore, a good sitting feeling can be obtained with the seat cushion having the above configuration.

[0045] [4. Seat Cushion of the Fourth Embodiment] Referring to FIG. 6, the configuration of the seat cushion according to the fourth embodiment will be described. In FIG. 6, for the sake of explanation, the configurations other than the seat cushion pad CP4 are not shown. The upper diagram of FIG. 6 corresponds to the III-III cross-sectional view of FIG. 1, and the lower diagram corresponds to the IV-IV cross-sectional view of FIG. 1.

[0046] As shown in FIG. 6, the second cushion layer 420 disposed below the first cushion layer 410 has a first member 421 disposed in a region that supports the buttocks D of the seated person A. The first member 421 is such that the ischial region 421a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral region of the ischial region 421a.

[0047] The first member 421 is insert-molded in the urethane layer constituting the first cushion layer 410, and an impregnation suppression member 450 for suppressing the impregnation of urethane is provided at the ischial region 421a facing the ischial tuberosity P of the seated person A. The lower part of the impregnation suppression member 450 (that is, the ischial region 421a) has a coarser texture than the peripheral part, so it is more flexible than the surrounding part. According to such a configuration, it is possible to change the flexibility by changing the impregnation rate of urethane with respect to the first member 421 during insert molding, so the degree of setting freedom is improved.

[0048] [5. Seat Cushion of the Fifth Embodiment] Referring to FIGS. 7A to 7C, the configuration of the seat cushion according to the fifth embodiment will be described. In FIGS. 7A to 7C, for the sake of explanation, the configurations other than the seat cushion pad CP5 and the sensor member 550 are not shown. The upper diagrams of FIGS. 7A to 7C correspond to the III-III cross-sectional view of FIG. 1, and the lower diagrams correspond to the IV-IV cross-sectional view of FIG. 1.

[0049] As shown in FIGS. 7A to 7C, the second cushion layer 520 disposed below the first cushion layer 510 has a first member 521 disposed in a region that supports the buttocks D of the seated person A. The first member 521 is such that the ischial region 521a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral region of the ischial region 521a.

[0050] And a sensor member 550 for detecting the state of the seated person is disposed on either the upper surface or the lower surface of the first member 521, and the sensor member 550 is disposed avoiding the ischial region 521a facing the ischial tuberosity P of the seated person A. In other words, the sensor member 550 is disposed at a position that does not overlap with the ischial region 521a in the sheet vertical direction. Note that FIG. 7 B and FIG. 7C shows an example in which the sensor member 550 is disposed on the upper surface of the first member 521.

[0051] Specifically, in a top view of the seat cushion pad CP5, the sensor member 550 is disposed in front of the first member 521 in the seat front-rear direction (FIG. 7A). Also, in a top view of the seat cushion pad CP5, the sensor member 550 may be disposed between the two ischial regions 521a in the seat width direction (FIG. 7B). Further, in a top view of the seat cushion pad CP5, the sensor member 550 may be partially overlapped with the first member 521 in the seat front-rear direction but disposed in front of the ischial region 521a (FIG. 7C).

[0052] According to such a configuration, since the sensor member 550 is disposed avoiding the ischial region 521a facing the ischial tuberosity P of the seated person A, the influence on the detection accuracy of the sensor member 550 can be suppressed.

[0053] [6. Seat Cushion of the Sixth Embodiment] The configuration of the seat cushion according to the sixth embodiment will be described with reference to FIGS. 8A to 8C. Note that in FIGS. 8A to 8C, for the sake of explanation, the configurations other than the seat cushion pad CP6 and related configurations are not shown. The upper diagrams of FIGS. 8A to 8C correspond to the III-III cross-sectional view of FIG. 1, and the lower diagrams correspond to the IV-IV cross-sectional view of FIG. 1.

[0054] As shown in FIGS. 8A to 8C, the second cushion layer 620 disposed below the first cushion layer 610 has a first member 621 disposed in a region that supports the buttocks D of the seated person A. The first member 621 is more flexible at the ischial site 621a facing the ischial tuberosity P of the seated person A than at the peripheral site of the ischial site 621a. The seat cushion includes a seat cushion frame CF6 serving as a skeleton and a support member SP6 that supports the seat cushion pad CP6 from below.

[0055] As shown in the lower diagrams of FIGS. 8A to 8C, the seat cushion frame CF6 has an outer shape that is substantially square frame-shaped when viewed from above. The seat cushion frame CF6 mainly includes a pair of seat cushion side frames CF6a that respectively constitute the left and right ends in the seat width direction, a front frame CF6b that connects the left and right seat cushion side frames CF6a at the front end, and a rear frame CF6c that connects the left and right seat cushion side frames CF6a at the rear end.

[0056] More specifically, the two (pair of) seat cushion side frames CF6a are spaced apart in the left-right direction and arranged to extend in the front-rear direction in order to define the width of the seat cushion frame CF6. The front frame CF6b is attached to the front side of the seat cushion frame CF6, and the rear frame CF6c is attached to the rear side of the seat cushion frame CF6. The left and right seat cushion side frames CF6a are connected at the front side and the rear side by the front frame CF6b and the rear frame CF6c, respectively.

[0057] Here, the support member SP6 is locked to the seat cushion frame CF6 at the locking portions 650 and 660, and the locking portions 650 and 660 are provided so as to avoid the ischial site 621a facing the ischial tuberosity P of the seated person A in the seat front-rear direction and the seat width direction. It is also possible to use a cloth-like elastic body as the support member SP6.

[0058] Specifically, as shown in FIG. 8A, in the sheet width direction, the support member SP6 is locked to the seat cushion side frame CF6a by the locking portion 650. The locking portion 650 is disposed at a position different from the ischial site 621a in the sheet front-rear direction. Also, as shown in FIG. 8A, in the sheet front-rear direction, the support member SP6 is locked to the front frame CF6b and the rear frame CF6c by the locking portion 660. The locking portion 660 is disposed at a position different from the ischial site 621a in the sheet width direction.

[0059] Also, as shown in FIG. 8B, the support member SP6 may be a plurality of members extending in the sheet front-rear direction. Also in this case, as shown in FIG. 8B, in the sheet front-rear direction, the support member SP6 is locked to the front frame CF6b and the rear frame CF6c by the locking portion 660. The locking portion 660 is disposed at a position different from the ischial site 621a in the sheet width direction.

[0060] Also, as shown in FIG. 8C, in the sheet width direction, when the support member SP6 (front support member SP6a, rear support member SP6b) is locked to the seat cushion side frame CF6a by the locking portion 650, the locking portion 650 is disposed at a position different from the ischial site 621a in the sheet front-rear direction. Also, the front support member SP6a and the rear support member SP6b are disposed at positions different from the ischial site 621a (that is, positions avoiding the ischial site 621a) in the sheet front-rear direction.

[0061] According to such a configuration, at a position avoiding the ischial site 621a, the support member SP6 is locked to the seat cushion frame CF6 by the locking portions 650 and 660, so that the support stability is improved, the flexibility of the ischial site 621a is not suppressed, and the support of the first member 621 is also stabilized.

[0062] [7. Seat Cushion of the Seventh Embodiment] With reference to FIG. 9, the configuration of the seat cushion according to the seventh embodiment will be described. In FIG. 9, for the sake of explanation, configurations other than the seat cushion pad CP7 and related configurations are not shown. The upper diagram of FIG. 9 corresponds to the III-III cross-sectional view of FIG. 1, and the lower diagram corresponds to the IV-IV cross-sectional view of FIG. 1.

[0063] As shown in FIG. 9, the second cushion layer 720 disposed below the first cushion layer 710 has a first member 721 disposed in a region that supports the buttocks D of the seated person A. Here, on the lower surface of the first member 721, two convex portions 721a protruding downward are provided at intervals in the seat width direction at the ischial sites facing the ischial tuberosities P of the seated person A.

[0064] The seat cushion also includes a seat cushion frame CF7 serving as a skeleton and a support member SP7 that supports the seat cushion pad CP7 from below. As shown in the lower diagram of FIG. 9, in the seat width direction, the support member SP7 is locked to the seat cushion side frame CF7a by a locking portion 750.

[0065] As shown in the lower diagram of FIG. 9, the seat cushion frame CF7 has an outer shape that is substantially square frame-shaped when viewed from above. The seat cushion frame CF7 mainly includes a pair of seat cushion side frames CF7a that respectively constitute the left and right ends in the seat width direction, a front frame CF7b that connects the left and right seat cushion side frames CF7a at the front end, and a rear frame CF7c that connects the left and right seat cushion side frames CF7a at the rear end.

[0066] More specifically, two (a pair of) seat cushion side frames CF7a are spaced apart in the left - right direction and arranged to extend in the front - rear direction in order to define the width of the seat cushion frame CF7. A front frame CF7b is attached to the front side of the seat cushion frame CF7, and a rear frame CF7c is attached to the rear side of the seat cushion frame CF7. The left and right seat cushion side frames CF7a are connected to each other at the front side and the rear side by the front frame CF7b and the rear frame CF7c respectively.

[0067] Also, a support member SP7 that supports the seat cushion pad CP7 from below is provided with a recess SP7a at a position facing the convex portion 721a. It is also possible to use a cloth - like elastic body as the support member SP7.

[0068] With such a configuration, in the first member 721, the ischial region (the region above where the convex portion 721a is provided) facing the ischial tuberosity P of the seated person A is more likely to deflect than the peripheral region of the ischial region.

[0069] According to such a configuration, since the convex portion 721a of the first member 721 fits into the recess SP7a of the support member SP7, the positioning of the first member 721 with respect to the support member SP7 becomes possible, so the assemblability is improved.

[0070] [8. Seat Cushion of the Eighth Embodiment] With reference to FIG. 10, the configuration of the seat cushion according to the eighth embodiment will be described. In FIG. 10, for the sake of explanation, the configurations other than the seat cushion pad CP8 and related configurations are not shown. The upper view of FIG. 10 corresponds to the X - X cross - sectional view of the lower view, and the lower view corresponds to the IV - IV cross - sectional view of FIG. 1.

[0071] As shown in FIG. 10, the second cushion layer 820 disposed below the first cushion layer 810 has a first member 821 disposed in a region that supports the buttocks D of the seated person A and a second member 822 disposed in a region that supports the thighs F of the seated person A.

[0072] The first member 821 is such that the ischial part 821a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral part of the ischial part 821a. Further, the first member 821 that supports the buttocks D is more flexible than the second member 822 that supports the thigh part F.

[0073] The second member 822 is formed of a three-dimensional network elastic body, and a blower 850 as a blower device is provided below the second member 822. Since the three-dimensional network elastic body allows air from the blower 850 to pass through easily, when the blower 850 is provided below the second member 822 formed of the three-dimensional network elastic body, it is possible to reduce the ventilation grooves formed in the first cushion layer 810.

[0074] [9. Seat Cushion of the Ninth Embodiment] With reference to FIG. 11, the configuration of the seat cushion according to the ninth embodiment will be described. In FIG. 11, for the sake of explanation, configurations other than the seat cushion pad CP9 and related configurations are not shown. The upper view of FIG. 11 corresponds to the cross-sectional view taken along the line XI-XI of the lower view, and the lower view corresponds to the cross-sectional view taken along the line IV-IV of FIG. 1.

[0075] As shown in FIG. 11, the second cushion layer 920 disposed below the first cushion layer 910 has a first member 921 disposed in a region that supports the buttocks D of the seated person A and a second member 922 disposed in a region that supports the thigh part F of the seated person A.

[0076] The first member 921 is such that the ischial part 921a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral part of the ischial part 921a. Further, the first member 921 that supports the buttocks D is more flexible than the second member 922 that supports the thigh part F.

[0077] Further, the seat cushion includes a seat cushion frame CF9 serving as a skeleton and a support member SP9 that supports the seat cushion pad CP9 from below.

[0078] As shown in the lower figure of Fig. 11, the seat cushion frame CF9 has a substantially rectangular frame-shaped outer shape when viewed from above. The seat cushion frame CF9 mainly includes a pair of seat cushion side frames CF9a that respectively constitute the left and right ends in the seat width direction, a front frame CF9b that connects the left and right seat cushion side frames CF9a at the front end, and a rear frame CF6c that connects the left and right seat cushion side frames CF9a at the rear end.

[0079] More specifically, the two (a pair of) seat cushion side frames CF9a are spaced apart in the left-right direction and arranged to extend in the front-rear direction in order to define the width of the seat cushion frame CF9. The front frame CF9b is attached to the front side of the seat cushion frame CF9, and the rear frame CF9c is attached to the rear side. The left and right seat cushion side frames CF9a are connected by the front frame CF9b and the rear frame CF9c at the front side and the rear side respectively.

[0080] As shown in Fig. 11, a submarine pipe 950 (a sinking prevention member) is provided on the seat cushion frame CF9 to suppress the submarine phenomenon in which the body of the occupant sitting on the vehicle seat S slides downward and forward when the vehicle undergoes a frontal collision. The submarine pipe 950 is provided between the left and right seat cushion side frames CF9a at a position behind the front frame CF9b on the front side of the seat cushion frame CF9.

[0081] And the submarine pipe 950 for suppressing the sinking of the occupant is located below the second member 922. According to such a configuration, when the vehicle undergoes a frontal collision, when the occupant A sinks downward, the second member 922 abuts against the submarine pipe 950 (the sinking prevention member), so that the effect of suppressing the downward sinking of the occupant A is improved.

[0082] [10. Seat Cushion of the Tenth Embodiment] With reference to FIG. 12, the configuration of the seat cushion according to the tenth embodiment will be described. In FIG. 12, for the sake of explanation, configurations other than the seat cushion pad CP10 and related configurations are not shown. The upper diagram of FIG. 12 corresponds to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponds to the cross-sectional view taken along line IV-IV in FIG. 1.

[0083] As shown in FIG. 12, the second cushion layer 1020 disposed below the first cushion layer 1010 includes a first member 1021 disposed in a region that supports the buttocks D of the seated person A and a second member 1022 disposed in a region that supports the thighs F of the seated person A.

[0084] In the first member 1021, the ischial region 1021a facing the ischial tuberosity P of the seated person A is more flexible than the peripheral region of the ischial region 1021a. Also, the first member 1021 that supports the buttocks D is more flexible than the second member 1022 that supports the thighs F.

[0085] The seat cushion pad CP10 (the first cushion layer 1010) is covered with a trim cover T as a skin material. As shown in FIG. 12, each of the hanging portions T1 to T3 of the trim cover T is disposed at a position avoiding the second member 1022.

[0086] Specifically, in a top view of the seat cushion, the first member 1021 and the second member 1022 are disposed between the first hanging portion T1 (right hanging portion) and the second hanging portion T2 (left hanging portion) in the seat width direction. Also, in the seat front-rear direction, the first member 1021 is disposed behind the third hanging portion T3 (rear hanging portion), and the second member 1022 is disposed in front of the third hanging portion T3 (rear hanging portion).

[0087] In other words, in the top view of the seat cushion pad CP10, the first member 1021 and the second member 1022 are arranged between the first suspension groove M1 (right suspension groove) and the second suspension groove M2 (left suspension groove) in the seat width direction. Also, in the seat front-rear direction, the first member 1021 is arranged behind the third suspension groove M3 (rear suspension groove), and the second member 1022 is arranged in front of the third suspension groove M3 (rear suspension groove).

[0088] The suspension wires arranged in each of the suspension parts T1 to T3 are insert-molded into the first cushion layer 1010. By performing the suspension at a thicker portion of the first cushion layer 1010 where the second member 1022 is not arranged, the suspension state becomes stable.

[0089] <Modified Example> In the examples shown in FIGS. 4, 10, and 11, the second member was provided separately from the first member, but it is also possible to integrally provide the second member with the first member. At this time, it is possible to change the ease of bending by forming the second member of the same material as the first member and changing its density. Also, it is possible to change the ease of bending by forming the first member and the second member of a three-dimensional network elastic body and changing the impregnation amount of urethane with respect to the first member and the second member.

Explanation of Reference Numerals

[0090] A Occupant D Buttocks F Thigh H Hip Point P Ischial Tuberosity S Vehicle Seat (Automobile Seat) S1 Seat Cushion CP Seat Cushion Pad T Trim Cover T1 First Suspension Part (Right Suspension Part) T2 Second Suspension Part (Left Suspension Part) T3 Third Suspension Part (Rear Suspension Part) S2 Seat Back S3 Headrest 10 First cushion layer 10a Upper surface 10b Lower surface 20 Second cushion layer 20a Upper surface 20b Lower surface 21 First member 21a Ischial region 22 Second member SP Support member CP1 Seat cushion pad 110 First cushion layer 120 Second cushion layer 121 First member 121 121a Ischial region CP2 Seat cushion pad 210 First cushion layer 220 Second cushion layer 221 First member 221a Ischial region 222 Second member CP3 Seat cushion pad 310 First cushion layer 320 Second cushion layer 321 First member 321a Ischial region 321b Concave portion CP4 Seat cushion pad 410 First cushion layer 420 Second cushion layer 421 First member 421a Ischial region 450 Invasion suppression member CP5 Seat cushion pad 510 First cushion layer 520 Second cushion layer 521 First member 521a Ischial region 550 Sensor member CP6 Seat cushion pad 610 First cushion layer 620 Second cushion layer 621 First member 621a Ischial region SP6 Support member SP6a Front support member SP6b Rear support member CF6 Seat cushion frame CF6a Seat cushion side frame CF6b Front frame CF6c Rear frame 650 Locking part 660 Locking part CP7 Seat cushion pad 710 First cushion layer 720 Second cushion layer 721 First member 721a Convex part SP7 Support member SP7a Concave part CF7 Seat cushion frame CF7a Seat cushion side frame CF7b Front frame CF7c Rear frame 750 Locking part CP8 Seat cushion pad 810 First cushion layer 820 Second cushion layer 821 First member 821a Convex part 822 Second member 850 Blower CP9 Seat cushion pad 910 First cushion layer 920 Second cushion layer 921 First member 921a Convex part 922 Second member SP9 Support member 950 Submarine pipe CF9 Seat cushion frame CF9a Seat cushion side frame CF9b Front frame CF9c Rear frame CP10 Seat Cushion Pad 1010 First Cushion Layer 1020 Second Cushion Layer 1021 First Member 1021a Convex Portion 1022 Second Member M1 First Hanging Groove (Right-Side Hanging Groove) M2 Second Hanging Groove (Left-Side Hanging Groove) M3 Third Hanging Groove (Rear-Side Hanging Groove)

Claims

1. A vehicle seat having a seat cushion, wherein the seat cushion includes a first cushion layer, and a second cushion layer disposed below the first cushion layer, the first cushion layer is more flexible than the second cushion layer and is covered with a skin material, the second cushion layer has a first member disposed in a region for supporting the buttocks of a seated person and a second member disposed in a region for supporting the thighs of the seated person, in the first member, the ischial region facing the ischial tuberosity of the seated person is more flexible than the peripheral region of the ischial region, the seat cushion includes a seat cushion frame serving as a skeleton and a plate-shaped support member for supporting the first member from below, the plate-shaped support member is provided avoiding the ischial region in a top view of the seat surface, the first member is more flexible than the second member, below the second member, a subsidence suppression member for suppressing the subsidence of the seated person is provided, a hanging-in portion of the skin material is disposed at a position avoiding the second member, characterized in that it is a vehicle seat.

2. The vehicle seat according to claim 1, wherein a recess penetrating in the vertical direction is provided at a position corresponding to the ischial region of the plate-shaped support member.

3. The first member is insert-molded in a urethane layer constituting the first cushion layer, the vehicle seat according to claim 1 or 2, characterized in that an impregnation suppression member for suppressing the impregnation of urethane is provided in the ischial region.

4. A sensor for detecting the state of a seated person is disposed on either the upper surface or the lower surface of the first member, the vehicle seat according to any one of claims 1 to 3, characterized in that the sensor is disposed avoiding the ischial region.

5. The plate-shaped support member is locked to the seat cushion frame at a locking portion, the vehicle seat according to any one of claims 1 to 4, characterized in that the locking portion is provided avoiding the ischial region in the front-rear direction.

6. The plate-shaped support member is locked to the seat cushion frame at a locking portion, the vehicle seat according to any one of claims 1 to 4, characterized in that the locking portion is provided avoiding the ischial region in the left-right direction.

7. A vehicle seat having a seat cushion, wherein the seat cushion includes a first cushion layer; a second cushion layer disposed below the first cushion layer; the first cushion layer is more easily bent than the second cushion layer; the second cushion layer has a first member disposed in a region for supporting the buttocks of the seated person and a second member disposed in a region for supporting the thighs of the seated person; in the first member, the ischial region facing the ischial tuberosity of the seated person is more easily bent than the peripheral region of the ischial region; the seat cushion includes a seat cushion frame serving as a skeleton and a plate-shaped support member that supports the first member from below; the plate-shaped support member is provided avoiding the ischial region in a top view of the seat surface; the first member is more easily bent than the second member; a sinking prevention member for suppressing the sinking of the seated person is provided below the second member; the second member is a three-dimensional network elastic body; a vehicle seat, characterized in that a blower is provided below the second member.

8. the first cushion layer is covered with a skin material; the vehicle seat according to claim 7, characterized in that the suspension portion of the skin material is disposed at a position avoiding the second member.

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