JP7712566B2 - Vehicle seat with seat cushion - Google Patents

Description

The present invention relates to a vehicle seat having a seat cushion, and more particularly to a vehicle seat having a seat cushion that provides excellent seating comfort.

In general, various proposals have been made to improve the seating comfort of seat cushions that support the buttocks and thighs of a seated person (passenger) in vehicle seats for vehicles, ships, aircraft, etc., and in chairs for furniture, etc. Various technologies for improving the seating comfort of seat cushions are known (for example, Patent Document 1).

The cushion pad for the vehicle seat described in Patent Document 1 has a three-dimensional mesh elastic body arranged in an impregnated state inside polyurethane foam. The three-dimensional mesh elastic body has a higher elastic modulus than polyurethane foam, and is arranged so as to avoid the area that receives the ischial tuberosities of the seated person.

JP 2013-198730 A

In the cushion pad described in Patent Document 1, the high elasticity portion is positioned to avoid the area that receives the ischial tuberosity of the seated person, which requires the central portion of the urethane pad layer to be thick. If the urethane pad layer is made thin, a feeling of hitting the bottom occurs and a comfortable seating experience cannot be achieved.

The present invention was made in consideration of the above problems, and its purpose is to provide a seat cushion that provides a comfortable seating experience and a vehicle seat that includes the seat cushion.

The above problem is solved by the vehicle seat of the present invention, which provides a vehicle seat including a seat cushion, the seat cushion including a first cushion layer and a second cushion layer arranged below the first cushion layer, the first cushion layer being more flexible than the second cushion layer and covered with a skin material, the second cushion layer having a first member arranged in an area supporting the buttocks of a seated occupant and a second member arranged in an area supporting the thighs of the seated occupant , the first member having an ischial region facing the ischial tuberosities of the seated occupant being more flexible than a peripheral region of the ischial region, the seat cushion including a seat cushion frame forming a skeleton, and a plate-shaped support member supporting the first member from below, the plate-shaped support member being arranged to avoid the ischial region when viewed from above the seat, the first member being more flexible than the second member, a sinking suppression member being provided below the second member to suppress sinking of the seated occupant, and a hanging portion of the skin material being arranged at a position avoiding the second member .

In the seat cushion of the present invention configured as described above, the ischial region of the first member is more flexible than the surrounding regions, and thus the load from the region corresponding to the ischial tuberosity of the seated person is released, resulting in a good seating feeling. In addition, even if the first cushion layer is configured to be thin, the occurrence of a bottoming out feeling is suppressed. In addition, since the first member supporting the buttocks is more flexible than the second member supporting the thighs of the seated person, the seating comfort is good. In addition, when the seated person sinks downward during a frontal collision, the second member abuts against the sinking suppression member, improving the effect of suppressing the seated person from sinking downward. In addition, the hanging wire arranged in the hanging portion is insert-molded in the first cushion layer, but the hanging state is stabilized by hanging in the thicker portion where the second member is not arranged.

In the above-mentioned configuration, it is preferable that the plate-shaped support member has a recess extending therethrough in the vertical direction at a position corresponding to the ischial region.
In the above-described configuration, the recess allows the load to be released from the area corresponding to the ischial tuberosities of the seated person, thereby improving seating comfort.

In the above configuration, the first member may be insert-molded into a urethane layer constituting the first cushion layer, and an impregnation suppression member for suppressing impregnation of urethane may be provided in the ischial region.
In the above-described configuration, the flexibility can be changed by varying the impregnation rate of urethane in the first member, thereby improving the degree of freedom in design.

In the above configuration, a sensor for detecting the state of a seated occupant 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 region.
In the above configuration, the sensor is positioned to avoid the ischial region, so that the effect on the detection accuracy of the sensor can be suppressed.

In the above-described configuration, the plate-shaped support member may be engaged with the seat cushion frame at an engaging portion, and the engaging portion may be provided so as to avoid the ischial region in the front-rear direction.
In the above configuration, the support member is engaged with the seat cushion frame at the engaging portion, thereby improving support stability, and the flexibility of the ischial region is not inhibited, and support of the first member is also stabilized.

In the above-described configuration, the plate-shaped support member may be engaged with the seat cushion frame at an engaging portion, and the engaging portion may be provided so as to avoid the ischial region in the left-right direction .
In the above configuration, the support member is engaged with the seat cushion frame at the engaging portion, thereby improving support stability, and the flexibility of the ischial region is not inhibited, and support of the first member is also stabilized.

The above problem is solved by a vehicle seat of the present invention, which provides a vehicle seat including a seat cushion, the seat cushion including a first cushion layer and a second cushion layer arranged below the first cushion layer, the first cushion layer being more flexible than the second cushion layer, the second cushion layer having a first member arranged in an area supporting the buttocks of a seated occupant and a second member arranged in an area supporting the thighs of the seated occupant, the first member having an ischial region facing the ischial tuberosities of the seated occupant being more flexible than a peripheral region of the ischial region, the seat cushion including a seat cushion frame forming a skeleton, and a plate-shaped support member supporting the first member from below, the plate-shaped support member being arranged to avoid the ischial region when viewed from above the seat, the first member being more flexible than the second member, a sinking suppression member being provided below the second member to suppress sinking of the seated occupant, the second member being a three-dimensional reticulated elastic body, and a blower being provided below the second member.
In the above configuration, the ischial region of the first member is more flexible than the surrounding regions, and the load from the region corresponding to the ischial tuberosity of the seated person is released, resulting in a good seating comfort. In addition, even if the first cushion layer is configured to be thin, the occurrence of a bottoming-out feeling is suppressed. In addition, the first member supporting the buttocks is more flexible than the second member supporting the thighs of the seated person, resulting in a good seating comfort. In addition, when the seated person sinks downward during a frontal collision, the second member abuts against the sinking suppression member, improving the effect of suppressing the seated person from sinking downward. In addition, since the three-dimensional mesh 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 mesh elastic body, it is possible to reduce the number of ventilation grooves formed in the cushion layer.

In the above configuration, the first cushion layer may be covered with a skin material, and a hanging portion of the skin material may be disposed at a position avoiding the second member.
In the above configuration, the hanging wire arranged in the hanging portion is insert molded into the first cushion layer, but the hanging state is stabilized by performing the hanging in the thicker portion where the second component is not arranged .

According to the vehicle seat of the present invention, the ischial region of the first member is more flexible than the surrounding regions, and thus the load from the region corresponding to the ischial tuberosities of the seated person is released, thereby improving the seating comfort. In addition, even if the first cushion layer is thin, the feeling of hitting the bottom is suppressed.
In addition, according to the vehicle seat of the present invention, the first member supporting the buttocks of the seated occupant is more flexible than the second member supporting the thighs of the seated occupant, so that the seating comfort is improved. Furthermore, when the seated occupant sinks downward in the event of a frontal collision, the second member comes into contact with the sinking suppression member, improving the effect of suppressing the seated occupant from sinking downward.
Furthermore, according to the vehicle seat of the present invention, the recess allows the load from the area corresponding to the ischial tuberosities of the seated person to be released, thereby improving seating comfort.
Furthermore, according to the vehicle seat of the present invention, it is possible to change the flexibility of the seat by varying the rate of urethane impregnation in the first member, thereby improving the degree of freedom in designing the seat.
Furthermore, according to the vehicle seat of the present invention, the sensors are positioned to avoid the ischial region, so that the effect on the detection accuracy of the sensors can be suppressed.
In addition, according to the vehicle seat of the present invention, the support member is engaged with the seat cushion frame at the engaging portion, thereby improving support stability, and the flexibility of the ischial area is not suppressed, and support of the first member is also stable .
Furthermore , according to the vehicle seat of the present invention, the three-dimensional reticulated elastic material easily allows air from the blower to pass therethrough, so if the blower is provided below the second member formed from the three-dimensional reticulated elastic material, it is possible to reduce the number of ventilation grooves formed in the cushion layer .
Furthermore , according to the vehicle seat of the present invention, the hanging wire arranged in the hanging portion is insert molded into the first cushion layer, but the hanging state is stabilized by performing the hanging in a thicker portion of the first cushion layer where the second member is not arranged.

1 is an external view of a vehicle seat according to first to tenth embodiments of the present invention; 2 is a cross-sectional view taken along the line II-II of FIG. 1, illustrating a state in which a seat occupant is seated on the seat cushion according to one embodiment of the present invention. FIG. 1 is a schematic explanatory diagram showing a structure of a seat cushion provided in a vehicle seat according to a first embodiment of the present invention, the upper diagram corresponds to the cross-sectional view taken along line III-III in FIG. 1 is a schematic explanatory diagram showing a structure of a seat cushion provided in a vehicle seat according to a second embodiment of the present invention, the upper diagram corresponds to the cross-sectional view taken along line III-III in FIG. 10A and 10B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a third embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 11A and 11B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a fourth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a fifth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a fifth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a fifth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a sixth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a sixth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a sixth embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 1, and the lower diagram corresponding to the cross-sectional view taken along line IV-IV in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a seventh embodiment of the present invention, the upper diagram corresponding to the cross-sectional view taken along line III-III in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to an eighth embodiment of the present invention, in which the upper diagram corresponds to the X-X cross-sectional view in the lower diagram, and the lower diagram corresponds to the IV-IV cross-sectional view in FIG. 13A and 13B are schematic explanatory diagrams showing a structure of a seat cushion provided in a vehicle seat according to a ninth embodiment of the present invention, the upper diagram corresponding to the XI-XI cross-sectional view of the lower diagram, and the lower diagram corresponding to the IV-IV cross-sectional view of FIG. 10 is a schematic explanatory diagram showing a structure of a seat cushion provided in a vehicle seat according to a tenth embodiment of the present invention, the upper diagram 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.

The seat cushion and vehicle seat according to the first to tenth embodiments of the present invention (hereinafter, the present embodiment) will be described below with reference to Figs. 1 to 12. The seat cushion and vehicle seat according to the present embodiment will be described taking a vehicle seat mounted on a vehicle as an example, but the seat cushion and vehicle seat are not limited to vehicle seats mounted on vehicles that run on wheels such as automobiles and trains, and may be seats mounted on aircraft, ships, and other vehicles that move on non-ground surfaces. Furthermore, the seat cushion according to the present embodiment is not limited to a seat cushion for a vehicle seat, and may be a seat cushion that supports the buttocks and thighs of a seated person in a chair or cushion of furniture, etc.

The embodiment described below is merely an example to facilitate understanding of the present invention, and is not intended to limit the present invention. In other words, the shape, dimensions, arrangement, etc. 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.

In this specification, the terms indicating directions are defined as shown in FIG. 1. Specifically, in the following description, the "front-rear direction" refers to the front-rear direction as seen by a person sitting in the vehicle seat, and is the same as the direction in which the vehicle travels. The "seat width direction" refers to the width direction of the vehicle seat, and is the same as the left-right direction as seen by a person sitting in the vehicle seat. Additionally, the "up-down direction" refers to the height direction of the vehicle seat, and is the same as the up-down direction as seen from the front of the vehicle seat.

In this specification, the term "hip point H (point H)" refers to the center of rotation connecting the torso and thighs F of the seated person A, as shown in FIG. 2. The area supporting the buttocks D of the seated person A means the area below the hip point H. Usually, the area supporting 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 seat front-rear direction. Also, the term "ischial tuberosity P" refers to the lowest part of the occupant's pelvis. Note that an AM50 type occupant dummy may be used as an example of the seated person A. Here, the AM50 type occupant dummy refers to an occupant dummy equivalent to the 50th percentile of American adult males as specified by U.S. regulations (height 175 cm, seated height 88 cm, weight approximately 78 kg).

<Main configuration of vehicle seat S>
The vehicle seat S according to this embodiment has an appearance as shown in Fig. 1. In Fig. 1, a part of the vehicle seat S (specifically, a front corner portion of a seat cushion S1) is shown with a trim cover T removed for convenience of illustration.

The main components of a vehicle seat S are a seat cushion S1 that serves as the seating portion that supports the buttocks D and thighs F of the seated occupant (passenger), a seat back S2 that serves as the backrest that supports the back of the seated occupant, and a headrest S3 that is disposed on top of the seat back S2 and supports the head of the seated occupant.

The seat cushion S1 is constructed by placing a seat cushion pad CP on a seat cushion frame, which serves as the skeleton, and then covering the seat cushion pad CP with a trim cover T. The seat back S2 is constructed by placing a cushion pad (not shown) on a seat back frame (not shown), and covering it with a trim cover T. The head rest S3 is formed by placing a pad material (not shown) on a core material (not shown), and covering it with a trim cover T.

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 molded by foam molding using urethane foam material. The trim cover T of the seat cushion S1 is provided with a first hanging portion T1 (right hanging portion) that is provided on the right side of the seat cushion and extends in the front-rear direction, a second hanging portion T2 (left hanging portion) that is provided on the left side of the seat cushion and extends in the front-rear direction, and a third hanging portion T3 (rear hanging portion) that is provided on the rear side of the seat cushion and extends in the seat width direction. In addition, hanging grooves M1 to M3 are provided at positions corresponding to the hanging portions T1 to T3 of the seat cushion pad CP, respectively (see FIG. 12 described later).

As shown in FIG. 2, the seat cushion pad CP of the seat cushion S1 includes, from the top, 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 side surfaces 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. The upper surface 10a and side peripheral surfaces of the first cushion layer 10 are covered by a trim cover T.

Here, the first cushion layer 10 has a lower hardness and elasticity than the second cushion layer 20, and is more flexible (i.e., the first cushion layer 10 has a lower resilience). In other words, the second cushion layer 20 has a higher hardness and elasticity than the first cushion layer 10, and is less flexible (i.e., the second cushion layer 20 has a higher resilience).

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 mesh elastic body made of thermoplastic polyester elastomer, etc., a synthetic resin elastic body such as high-hardness urethane, expanded polypropylene (EPP), urethane rubber, or a thermoplastic elastomer. Here, the three-dimensional mesh elastic body is suitable as a material for forming the second cushion layer 20 because it has breathability due to being a mesh body, and has the function of allowing air to pass through without stagnation inside when the volume of the second cushion layer 20 changes.

Examples of the support member SP are not particularly limited as long as they are capable of supporting the seat cushion pad CP from below, and include an S-spring as a pressure-receiving member, a plate-like member made of resin or metal, a pan frame, and a cloth-like support member (e.g., a cloth-like elastic body).

In the seat cushion pad CP of this embodiment, as shown in FIG. 2, the first member 21 constituting the second cushion layer 20 is disposed in the area supporting the buttocks D of the seated person A. The first member 21 is formed so that the ischial region 21a facing the ischial tuberosity P of the seated person A is more flexible than the surrounding region of the ischial region 21a.

Normally, the seating pressure is highest in the area facing the ischial tuberosities P of the seated person A seated on the seating surface of the seat cushion S1, but because the ischial area 21a is formed to be more flexible than the surrounding areas of the ischial area 21a, the seating pressure in the area where the seating pressure is highest is reduced. Therefore, the seat cushion S1 provides a good seating comfort. Also, even if the first cushion layer 10 is made thin, the feeling of hitting the bottom is suppressed.

[1. Seat cushion of the first embodiment]
The configuration of the seat cushion according to the first embodiment will be described with reference to Fig. 3. For the sake of explanation, components other than the seat cushion pad CP1 are not shown in Fig. 3. The upper view of Fig. 3 corresponds to the cross-sectional view taken along line III-III in Fig. 1, and the lower view of Fig. 3 corresponds to the cross-sectional view taken along line IV-IV in Fig. 1.

As shown in FIG. 3, the second cushion layer 120, which is disposed below the first cushion layer 110, has a first member 121 disposed in an area supporting the buttocks D of the seated person A. The first member 121 has an ischial region 121a that faces the ischial tuberosity P of the seated person A and is more flexible than the surrounding area of the ischial region 121a.

The ischial region 121a of the first member 121 is more flexible than the surrounding regions, which allows the load applied from the region of the buttocks D corresponding to the ischial tuberosities P of the seated person A to be appropriately released. Therefore, a seat cushion having the above configuration provides a comfortable seating experience. In addition, even if the first cushion layer 110 is configured to be thin, the feeling of hitting the bottom is suppressed.

[2. Seat cushion of second embodiment]
The configuration of the seat cushion according to the second embodiment will be described with reference to Fig. 4. For the sake of explanation, components other than the seat cushion pad CP2 are not shown in Fig. 4. The upper view of Fig. 4 corresponds to the cross-sectional view taken along line III-III in Fig. 1, and the lower view of Fig. 4 corresponds to the cross-sectional view taken along line IV-IV in Fig. 1.

As shown in FIG. 4, the second cushion layer 220 disposed below the first cushion layer 210 has a first member 221 disposed in an area supporting the buttocks D of the seated person A, and a second member 222 disposed in an area supporting the thighs F of the seated person A.

The first member 221 is more flexible at the ischial region 221a that faces the ischial tuberosity P of the seated person A than at the surrounding region of the ischial region 221a. Also, the first member 221 that supports the buttocks D is more flexible than the second member 222 that supports the thighs F.

The first member 221 supporting the buttocks D is more flexible than the second member 222 supporting the thighs F of the seated person A, so it is possible to stably support the thighs F while appropriately dissipating the load applied from the buttocks D. Therefore, a seat cushion with the above configuration provides a comfortable seating experience.

[3. Seat cushion of third embodiment]
The configuration of the seat cushion according to the third embodiment will be described with reference to Fig. 5. For the sake of explanation, components other than the seat cushion pad CP3 are not shown in Fig. 5. The upper view of Fig. 5 corresponds to the cross-sectional view taken along line III-III in Fig. 1, and the lower view of Fig. 5 corresponds to the cross-sectional view taken along line IV-IV in Fig. 1.

As shown in FIG. 5, the second cushion layer 320 disposed below the first cushion layer 310 has a first member 321 disposed in an area supporting the buttocks D of the seated person A. The first member 321 has a recess 321b in an ischial region 321a facing the ischial tuberosity P of the seated person A, and the ischial region 321a is more flexible than the surrounding areas of the ischial region 321a.

The recess 321b is formed in the ischial region 321a of the first member 321, which makes it more flexible than the surrounding regions, and this allows the load applied from the region of the buttocks D corresponding to the ischial tuberosities P of the seated person A to be appropriately released. Therefore, a seat cushion with the above configuration provides a comfortable seating experience.

[4. Seat cushion of fourth embodiment]
The configuration of the seat cushion according to the fourth embodiment will be described with reference to Fig. 6. For the sake of explanation, components other than the seat cushion pad CP4 are not shown in Fig. 6. The upper view of Fig. 6 corresponds to the cross-sectional view taken along line III-III in Fig. 1, and the lower view of Fig. 6 corresponds to the cross-sectional view taken along line IV-IV in Fig. 1.

As shown in FIG. 6, the second cushion layer 420, which is disposed below the first cushion layer 410, has a first member 421 disposed in an area supporting the buttocks D of the seated person A. The first member 421 has an ischial region 421a, which faces the ischial tuberosity P of the seated person A, which is more flexible than the surrounding region of the ischial region 421a.

The first member 421 is insert molded into the urethane layer that constitutes the first cushion layer 410, and the ischial region 421a that faces the ischial tuberosity P of the seated person A is provided with an impregnation suppression member 450 that suppresses the impregnation of urethane. The lower portion of the impregnation suppression member 450 (i.e., the ischial region 421a) is less dense than the surrounding area, and is therefore more flexible than the surrounding area. With this configuration, it is possible to change the flexibility by changing the impregnation rate of urethane in the first member 421 during insert molding, improving the degree of freedom in design.

[5. Seat cushion of fifth embodiment]
The configuration of the seat cushion according to the fifth embodiment will be described with reference to Figures 7A to 7C. For the sake of explanation, configurations other than the seat cushion pad CP5 and the sensor member 550 are omitted from Figures 7A to 7C. The upper views of Figures 7A to 7C correspond to the cross-sectional view taken along line III-III in Figure 1, and the lower views correspond to the cross-sectional view taken along line IV-IV in Figure 1.

As shown in Figures 7A to 7C, the second cushion layer 520 disposed below the first cushion layer 510 has a first member 521 disposed in an area supporting the buttocks D of the seated person A. The first member 521 has an ischial region 521a facing the ischial tuberosity P of the seated person A that is more flexible than the surrounding region of the ischial region 521a.

A sensor member 550 for detecting the state of the seated occupant is disposed on either the upper or lower surface of the first member 521, and the sensor member 550 is disposed so as to avoid the ischial region 521a that faces the ischial tuberosity P of the seated occupant A. In other words, the sensor member 550 is disposed at a position that does not overlap with the ischial region 521a in the seat vertical direction. Note that Fig. 7B and Fig. 7C show an example in which the sensor member 550 is disposed on the upper surface of the first member 521.

Specifically, in a top view of the seat cushion pad CP5, the sensor member 550 is disposed forward of the first member 521 in the seat front-rear direction (Fig. 7A). In addition, 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). Furthermore, in a top view of the seat cushion pad CP5, the sensor member 550 may be disposed in front of the ischial regions 521a, although it partially overlaps with the first member 521 in the seat front-rear direction (Fig. 7C).

With this configuration, the sensor member 550 is positioned to avoid the ischial region 521a that faces the ischial tuberosity P of the seated person A, thereby suppressing the effect of the sensor member 550 on the detection accuracy.

[6. Seat cushion of the sixth embodiment]
The configuration of the seat cushion according to the sixth embodiment will be described with reference to Figures 8A to 8C. Note that, for the sake of explanation, configurations other than the seat cushion pad CP6 and related configurations are omitted in Figures 8A to 8C. The upper views of Figures 8A to 8C correspond to the cross-sectional view taken along line III-III in Figure 1, and the lower views correspond to the cross-sectional view taken along line IV-IV in Figure 1.

As shown in Figures 8A to 8C, the second cushion layer 620, which is disposed below the first cushion layer 610, has a first member 621 disposed in an area supporting the buttocks D of the seated person A. The first member 621 has an ischial region 621a that faces the ischial tuberosity P of the seated person A, which is more flexible than the surrounding region of the ischial region 621a. The seat cushion also includes a seat cushion frame CF6 that serves as a skeleton, and a support member SP6 that supports the seat cushion pad CP6 from below.

As shown in the lower diagrams of Figures 8A to 8C, the seat cushion frame CF6 has a generally rectangular frame-like external shape when viewed from above. The main components of the seat cushion frame CF6 are a pair of seat cushion side frames CF6a that respectively form 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 their front ends, and a rear frame CF6c that connects the left and right seat cushion side frames CF6a at their rear ends.

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

Here, the support member SP6 is engaged with the seat cushion frame CF6 at the engaging portions 650 and 660, and the engaging portions 650 and 660 are provided to avoid the ischial region 621a that faces the ischial tuberosity P of the seated occupant A in the seat front-rear direction and the seat width direction. A cloth-like elastic material can also be used as the support member SP6.

Specifically, as shown in FIG. 8A, in the seat width direction, the support member SP6 is engaged with the seat cushion side frame CF6a by an engagement portion 650. The engagement portion 650 is disposed at a position different from the ischial region 621a in the seat front-rear direction. Also, as shown in FIG. 8A, in the seat front-rear direction, the support member SP6 is engaged with the front frame CF6b and the rear frame CF6c by an engagement portion 660. The engagement portion 660 is disposed at a position different from the ischial region 621a in the seat width direction.

Also, as shown in FIG. 8B, the support member SP6 may be a plurality of members extending in the seat front-rear direction. In this case, too, as shown in FIG. 8B, the support member SP6 is locked to the front frame CF6b and the rear frame CF6c in the seat front-rear direction by locking portions 660. The locking portions 660 are disposed at positions different from the ischial region 621a in the seat width direction.

As shown in FIG. 8C, when the support members SP6 (front support member SP6a, rear support member SP6b) are locked to the seat cushion side frame CF6a by the locking portions 650 in the seat width direction, the locking portions 650 are disposed at positions different from the ischial region 621a in the seat front-rear direction. Also, the front support member SP6a and the rear support member SP6b are disposed at positions different from the ischial region 621a in the seat front-rear direction (i.e., positions that avoid the ischial region 621a).

With this configuration, the support member SP6 is engaged with the seat cushion frame CF6 by the engaging portions 650, 660 at a position that avoids the ischial region 621a, improving support stability, not inhibiting flexibility of the ischial region 621a, and providing stable support for the first member 621.

[7. Seat cushion of seventh embodiment]
The configuration of the seat cushion according to the seventh embodiment will be described with reference to Fig. 9. For the sake of explanation, Fig. 9 omits illustration of configurations other than the seat cushion pad CP7 and related configurations. The upper view of Fig. 9 corresponds to the cross-sectional view taken along III-III in Fig. 1, and the lower view corresponds to the cross-sectional view taken along IV-IV in Fig. 1.

As shown in FIG. 9, the second cushion layer 720, which is disposed below the first cushion layer 710, has a first member 721 disposed in an area supporting the buttocks D of the seated person A. Here, on the underside of the first member 721, two convex portions 721a that protrude downward are provided at a distance in the seat width direction in the ischial region facing the ischial tuberosity P of the seated person A.

The seat cushion also includes a seat cushion frame CF7, which serves as the framework, and a support member SP7 that supports the seat cushion pad CP7 from below. As shown in the lower diagram of FIG. 9, the support member SP7 is engaged with the seat cushion side frame CF7a by an engagement portion 750 in the seat width direction.

As shown in the lower diagram of Figure 9, the seat cushion frame CF7 has a generally rectangular frame-like external shape when viewed from above. The main components of the seat cushion frame CF7 are a pair of seat cushion side frames CF7a that respectively form 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 their front ends, and a rear frame CF7c that connects the left and right seat cushion side frames CF7a at their rear ends.

More specifically, the two (pair) seat cushion side frames CF7a are spaced apart in the left-right direction to define the width of the seat cushion frame CF7, and are arranged to extend in the front-rear direction. 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, and the left and right seat cushion side frames CF7a are connected at the front and rear sides by the front frame CF7b and the rear frame CF7c, respectively.

The support member SP7, which supports the seat cushion pad CP7 from below, has a recess SP7a at a position opposite the protrusion 721a. A cloth-like elastic material can also be used as the support member SP7.

With this configuration, the first member 721 is more flexible at the ischial region (the upper region where the protrusion 721a is provided) that faces the ischial tuberosity P of the seated person A than at the surrounding regions of the ischial region.

With this configuration, the protrusion 721a of the first member 721 fits into the recess SP7a of the support member SP7, making it possible to position the first member 721 relative to the support member SP7, improving assembly.

[8. Seat cushion of eighth embodiment]
The configuration of the seat cushion according to the eighth embodiment will be described with reference to Fig. 10. For the sake of explanation, Fig. 10 omits illustration of configurations other than the seat cushion pad CP8 and related configurations. 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.

As shown in FIG. 10, the second cushion layer 820 disposed below the first cushion layer 810 has a first member 821 disposed in an area supporting the buttocks D of the seated person A, and a second member 822 disposed in an area supporting the thighs F of the seated person A.

The first member 821 is more flexible at the ischial region 821a, which faces the ischial tuberosity P of the seated person A, than the surrounding region of the ischial region 821a. In addition, the first member 821 supporting the buttocks D is more flexible than the second member 822 supporting the thighs F.

The second member 822 is formed of a three-dimensional mesh elastic body, and a blower 850 is provided below the second member 822 as an air blowing device. Because the three-dimensional mesh elastic body allows air from the blower 850 to pass easily, providing the blower 850 below the second member 822 formed of a three-dimensional mesh elastic body makes it possible to reduce the number of ventilation grooves formed in the first cushion layer 810.

[9. Seat cushion of ninth embodiment]
The configuration of the seat cushion according to the ninth embodiment will be described with reference to Fig. 11. For the sake of explanation, Fig. 11 omits illustration of configurations other than the seat cushion pad CP9 and related configurations. The upper view of Fig. 11 corresponds to the XI-XI cross-sectional view of the lower view, and the lower view corresponds to the IV-IV cross-sectional view of Fig. 1.

As shown in FIG. 11, the second cushion layer 920 disposed below the first cushion layer 910 has a first member 921 disposed in an area supporting the buttocks D of the seated person A, and a second member 922 disposed in an area supporting the thighs F of the seated person A.

The first member 921 is more flexible at the ischial region 921a that faces the ischial tuberosity P of the seated person A than at the surrounding region of the ischial region 921a. Also, the first member 921 that supports the buttocks D is more flexible than the second member 922 that supports the thighs F.

The seat cushion also includes a seat cushion frame CF9 that serves as the framework, and a support member SP9 that supports the seat cushion pad CP9 from below.

As shown in the lower diagram of FIG. 11, the seat cushion frame CF9 has a generally rectangular frame-like external shape when viewed from above. The main components of the seat cushion frame CF9 are a pair of seat cushion side frames CF9a that respectively form 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 their front ends, and a rear frame CF6c that connects the left and right seat cushion side frames CF9a at their rear ends.

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

As shown in FIG. 11, the seat cushion frame CF9 is provided with a submarine pipe 950 (sinking suppression member) for suppressing the submarine phenomenon in which the body of a seated person in the vehicle seat S slides forward and downward when the vehicle crashes head-on. The submarine pipe 950 is provided on the front side of the seat cushion frame CF9, at a position rearward of the front frame CF9b, between the left and right seat cushion side frames CF9a.

A submarine pipe 950 that prevents the seated occupant A from sinking is located below the second member 922. With this configuration, when occupant A sinks downward during a frontal collision, the second member 922 comes into contact with the submarine pipe 950 (sinking prevention member), improving the effect of preventing occupant A from sinking downward.

[10. Seat cushion of the tenth embodiment]
The configuration of the seat cushion according to the tenth embodiment will be described with reference to Fig. 12. For the sake of explanation, Fig. 12 omits illustration of configurations other than the seat cushion pad CP10 and related configurations. The upper view of Fig. 12 corresponds to the III-III cross-sectional view of Fig. 1, and the lower view corresponds to the IV-IV cross-sectional view of Fig. 1.

As shown in FIG. 12, the second cushion layer 1020 disposed below the first cushion layer 1010 has a first member 1021 disposed in an area supporting the buttocks D of the seated person A, and a second member 1022 disposed in an area supporting the thighs F of the seated person A.

The first member 1021 is more flexible at the ischial region 1021a that faces the ischial tuberosity P of the seated person A than at the surrounding 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.

The seat cushion pad CP10 (first cushion layer 1010) is covered by a trim cover T as a skin material, and as shown in FIG. 12, each of the hanging portions T1 to T3 of the trim cover T is positioned to avoid the second member 1022.

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. In addition, in the seat front-rear direction, the first member 1021 is disposed rearward of the third hanging portion T3 (rear hanging portion), and the second member 1022 is disposed forward of the third hanging portion T3 (rear hanging portion).

In other words, in a top view of the seat cushion pad CP10, the first member 1021 and the second member 1022 are disposed between the first hanging groove M1 (right side hanging groove) and the second hanging groove M2 (left side hanging groove) in the seat width direction. In addition, in the seat front-rear direction, the first member 1021 is disposed rearward of the third hanging groove M3 (rear side hanging groove), and the second member 1022 is disposed forward of the third hanging groove M3 (rear side hanging groove).

The hanging wires arranged in each of the hanging sections T1 to T3 are insert molded into the first cushion layer 1010, but the hanging state is stabilized by hanging in the thicker parts of the first cushion layer 1010 where the second member 1022 is not arranged.

<Modification>
In the examples shown in Figures 4, 10 and 11, the second member is provided separately from the first member, but it is also possible to provide the second member integrally with the first member. In this case, the second member is made of the same material as the first member, and the flexibility can be changed by changing the density. It is also possible to form the first and second members from a three-dimensional reticulated elastic body, and change the amount of urethane impregnated into the first and second members to change the flexibility.

A: seated person D: buttocks F: thigh H: hip point P: ischial tuberosity S: vehicle seat (vehicle seat)
S1 Seat cushion CP Seat cushion pad T Trim cover T1 First hanging part (right side hanging part)
T2 Second hanging part (left hanging part)
T3 Third hanging part (rear hanging 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 Ichthys region 22 Second member SP Support member CP1 Seat cushion pad 110 First cushion layer 120 Second cushion layer 121 First member 121
121a Ischium region CP2 Seat cushion pad 210 First cushion layer 220 Second cushion layer 221 First member 221a Ischium region 222 Second member CP3 Seat cushion pad 310 First cushion layer 320 Second cushion layer 321 First member 321a Ischium region 321b Recess CP4 Seat cushion pad 410 First cushion layer 420 Second cushion layer 421 First member 421a Ischium region 450 Impregnation suppression member CP5 Seat cushion pad 510 First cushion layer 520 Second cushion layer 521 First member 521a Ischium region 550 Sensor member CP6 Seat cushion pad 610 First cushion layer 620 Second cushion layer 621 First member 621a Ischium 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 portion 660 Locking portion CP7 Seat cushion pad 710 First cushion layer 720 Second cushion layer 721 First member 721a Convex portion SP7 Support member SP7a Concave portion CF7 Seat cushion frame CF7a Seat cushion side frame CF7b Front frame CF7c Rear frame 750 Locking portion CP8 Seat cushion pad 810 First cushion layer 820 Second cushion layer 821 First member 821a Convex portion 822 Second member 850 Blower CP9 Seat cushion pad 910 First cushion layer 920 Second cushion layer 921 First member 921a Convex portion 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 hanging groove)
M3 Third hanging groove (rear hanging groove)

Claims (8)

A vehicle seat including a seat cushion,
The seat cushion is
A first cushion layer;
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 arranged in an area supporting the buttocks of a seated person and a second member arranged in an area supporting the thighs of the seated person ,
The first member has an ischial region facing the ischial tuberosity of a seated person that is more flexible than a surrounding region of the ischial region,
The seat cushion includes a seat cushion frame that serves as a skeleton, and a plate-shaped support member that supports the first member from below,
The plate-shaped support member is provided to avoid the ischial region when viewed from above the seat ,
The first member is more flexible than the second member,
A sinking suppression member that suppresses sinking of a seated occupant is provided below the second member,
The vehicle seat , wherein the hanging portion of the cover material is disposed at a position avoiding the second member . 2. The vehicle seat according to claim 1 , wherein the plate-shaped support member is provided with a recess extending vertically therethrough at a position corresponding to the ischial region. the first member is insert-molded into a urethane layer constituting the first cushion layer,
3. The vehicle seat according to claim 1 , wherein an impregnation suppressing member is provided in the ischial region to suppress impregnation of urethane. A sensor for detecting the state of an occupant is disposed on either the upper surface or the lower surface of the first member,
4. The vehicle seat according to claim 1 , wherein the sensor is disposed so as to avoid the ischial region. The plate-shaped support member is engaged with the seat cushion frame at an engaging portion,
5. The vehicle seat according to claim 1, wherein the engaging portion is provided so as to avoid the ischial region in the front-rear direction. The plate-shaped support member is engaged with the seat cushion frame at an engaging portion,
5. The vehicle seat according to claim 1, wherein the engaging portion is provided so as to avoid the ischial region in the left-right direction. A vehicle seat including a seat cushion,
The seat cushion is
A first cushion layer;
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 arranged in an area supporting the buttocks of a seated person and a second member arranged in an area supporting the thighs of the seated person,
The first member has an ischial region facing the ischial tuberosity of a seated person that is more flexible than a surrounding region of the ischial region,
The seat cushion includes a seat cushion frame that serves as a skeleton, and a plate-shaped support member that supports the first member from below,
The plate-shaped support member is provided to avoid the ischial region when viewed from above the seat,
The first member is more flexible than the second member,
A sinking suppression member that suppresses sinking of a seated occupant is provided below the second member,
The second member is a three-dimensional reticulated elastic body,
A vehicle seat, comprising : a blower provided below the second member. The first cushion layer is covered with a skin material,
8. The vehicle seat according to claim 7 , wherein the hanging portion of the cover material is disposed at a position avoiding the second member.