JP2024045684A - vehicle seat - Google Patents

Abstract

[Problem] To provide a vehicle seat that can appropriately control the behavior of the occupant's pelvis (lumbar region) when an impact such as a collision occurs, and can prevent the occurrence of a compressive load on the occupant's spine. [Solution] A vehicle seat S equipped with a seat cushion S1, the seat cushion S1 having a seat cushion frame 10 and a cushion pad 1b placed on the seat cushion frame 10, the seat cushion frame 10 having a first sinking suppression member 15 that suppresses sinking of the seated occupant, and a second sinking suppression member 16 provided behind the first sinking suppression member 15. [Selected Figure] Figure 3

Description

The present invention relates to a vehicle seat, and in particular to a vehicle seat that can prevent the lumbar region of the seated occupant from sinking when an impact such as a collision occurs.

In the event of a frontal collision of a moving vehicle, a submarine phenomenon may occur in which the body of the person seated in the seat (occupant) slides forward and downward on the surface of the seat while being restrained by the seat belt. . As a countermeasure for suppressing the submarine phenomenon, for example, as described in Patent Document 1, a vehicle seat is known in which a pipe member is provided on the lower side of the front part of the seat cushion to suppress submergence. There is.

Japanese Patent Application Publication No. 2004-34797

However, in the event of a frontal collision, when the occupant sinks, the pelvis can rotate too much, causing a compressive load on the spine, which can put strain on the occupant.

The present invention was made in consideration of the above problems, and its purpose is to provide a vehicle seat that can appropriately control the behavior of the occupant's pelvis (lumbar region) when an impact such as a collision occurs, thereby preventing compressive load from being applied to the occupant's spine.

According to the vehicle seat of the present invention, the problem is solved by a vehicle seat including a seat cushion, wherein the seat cushion includes a seat cushion frame, a cushion pad placed on the seat cushion frame, and a seat cushion. , the seat cushion frame includes a first sinking suppressing member that suppresses sinking of a seated person, and a second sinking suppressing member provided behind the first sinking suppressing member. This is solved by providing .

In the seat cushion of the present invention configured as described above, in the event of a frontal collision, the first sinking suppressing member prevents the seated person from sinking forward, and the first sinking suppressing member also prevents the seated person from sinking forward. The second sinking suppressing member provided at the rear prevents the seated person from sinking, thereby suppressing the generation of compressive load on the spine due to excessive rotation of the seated person's pelvis (lumbar region). Ru.

In addition, in the above configuration, the seat cushion frame may include a pan frame that supports the thighs of a seated occupant, and the second sinking suppression member may be provided rearward of the rear end of the pan frame.
In the above configuration, the second sinking suppression member is provided at a position rearward of the rear end of the pan frame and closer to the waist of the seated person, thereby suppressing sinking of the seated person's waist in the event of a frontal collision, effectively preventing excessive rotation of the seated person's pelvis (waist) and resulting in compressive load on the spine.

Further, in the above configuration, it is preferable that the second subsidence suppressing member is provided below the first subsidence suppressing member.
With the above configuration, in the event of a frontal collision, the seated person is prevented from sinking forward, and the compressive load generated on the spine due to excessive rotation of the seated person's pelvis (lumbar region) is appropriately suppressed. .

In the above configuration, a high-hardness portion having a harderness than a urethane base material of the cushion pad may be provided below the cushion pad, and the high-hardness portion may be arranged so as to overlap at least a portion of the second sinking suppression member in the vertical direction of the vehicle seat.
In the above configuration, a portion of the high hardness portion is positioned so as to overlap with the second sinking suppression member, and in the event of a frontal collision, rotation of the pelvis (lumbar region) associated with sinking of the seated occupant is prevented by both the high hardness portion and the second sinking suppression member, thereby further preventing excessive rotation of the seated occupant's pelvis (lumbar region).

Further, in the above configuration, it is preferable that the high-hardness portion is arranged so as to at least partially overlap a support member that supports the cushion pad in the up-down direction of the vehicle seat.
In the above configuration, in the event of a frontal collision, the downward displacement of the high-hardness portion is prevented by the support member, so that excessive rotation of the pelvis (lumbar region) due to the sinking of the seated person is further suppressed. Ru.

In the above configuration, the high hardness portion may be a plate-like member arranged so as to straddle the second sinking suppression member in the front-rear direction of the vehicle seat.
In the above configuration, in the event of a frontal collision, downward displacement of the plate-shaped member is prevented by the underside of the plate-shaped member coming into surface contact with the second sinking suppression member, thereby further preventing the pelvis (lower back) from rotating excessively as the seated occupant sinks.

In the above configuration, the high hardness portion may be a resin molded product.
With the above configuration, it is possible to prevent the pelvis (lower back) from rotating excessively as the occupant sinks during a frontal collision, without significantly increasing the weight of the vehicle seat compared to when the high hardness portion is not provided.

Further, in the above configuration, it is preferable that the high hardness portion is integrated with the cushion pad.
In the above configuration, since the high hardness portion is integrated with the cushion pad, there is no need to separately attach the high hardness portion to the cushion pad, improving workability.

Further, in the above configuration, the high hardness portion may be disposed between the thin portion provided on the cushion pad and the second sinkage suppressing member in the vertical direction of the vehicle seat.
In the above configuration, since the high-hardness portion is disposed between the thin-walled portion of the cushion pad and the second sinking suppression member, when the high-hardness portion is displaced downward during a frontal collision, the second Since the positional relationship is appropriately prevented by the sinking suppressing member, excessive rotation of the pelvis (lumbar region) of the seated person is appropriately suppressed.

In the above configuration, the high hardness portion which is a plate-like member may be curved with respect to a width direction of the vehicle seat.
In the above configuration, when the high hardness portion, which is a plate-shaped member, is displaced downward during a frontal collision, the central portion or end portion of the plate-shaped member curved in the seat width direction comes into contact with the second sinking suppression member, dispersing the load and preventing the high hardness portion from displacing downward, thereby appropriately suppressing excessive rotation of the pelvis (lower back) as the seated occupant sinks.

With the vehicle seat of the present invention, in the event of a frontal collision, the first sinking prevention member prevents the occupant from sinking forward, and the second sinking prevention member provided behind the first sinking prevention member prevents the occupant from sinking downward, thereby preventing the occupant's pelvis (lower back) from rotating too far, which could cause a compressive load on the spine.
Furthermore, according to the vehicle seat of the present invention, the second sinking suppression member is provided at a position rearward of the rear end of the pan frame and closer to the waist of the occupant, thereby suppressing sinking of the occupant in the event of a frontal collision, effectively preventing excessive rotation of the occupant's pelvis (waist) and resulting in compressive load on the spine.
Furthermore, the vehicle seat of the present invention appropriately prevents the occupant from sinking forward during a frontal collision, while also preventing the occupant's pelvis (lower back) from rotating too much, which could result in a compressive load being placed on the spine.
Furthermore, according to the vehicle seat of the present invention, a portion of the high hardness portion is positioned so as to overlap with the second sinking suppression member, and in the event of a frontal collision, rotation of the pelvis (lumbar region) associated with sinking of the seated occupant is prevented by both the high hardness portion and the second sinking suppression member, thereby further preventing excessive rotation of the occupant's pelvis (lumbar region).
Furthermore, with the vehicle seat of the present invention, in the event of a frontal collision, downward displacement of the high hardness portion is prevented by the support member, further preventing the pelvis (lower back) from rotating excessively as the occupant sinks.
In addition, according to the vehicle seat of the present invention, in the event of a frontal collision, downward displacement of the plate-shaped member is prevented by the underside of the plate-shaped member coming into surface contact with the second sinking suppression member, thereby further preventing the pelvis (lower back) from rotating excessively as the seated occupant sinks.
Furthermore, with the vehicle seat of the present invention, it is possible to prevent the pelvis (lower back) from rotating excessively as the occupant sinks during a frontal collision, without significantly increasing the weight of the vehicle seat compared to when the high hardness portion is not provided.
Furthermore, according to the vehicle seat of the present invention, since the high hardness portion is integrated with the cushion pad, there is no need to attach a separate high hardness portion to the cushion pad, improving workability.
Furthermore, according to the vehicle seat of the present invention, the high hardness portion is disposed between the thin portion of the cushion pad and the second sinking suppression member, so that when the high hardness portion is displaced downward during a frontal collision, it is positioned in such a way that it is appropriately prevented by the second sinking suppression member, thereby appropriately preventing the pelvis (lower back) of the seated occupant from rotating excessively.
Furthermore, according to the vehicle seat of the present invention, when the high hardness portion, which is a plate-shaped member, is displaced downward during a frontal collision, the central portion or end portion of the plate-shaped member curved in the seat width direction comes into contact with the second sinking suppression member, dispersing the load and preventing the high hardness portion from displacing downward, thereby appropriately suppressing excessive rotation of the pelvis (lower back) as the seated occupant sinks.

1 is an external view of a vehicle seat according to first and second embodiments of the present invention. FIG. FIG. 1 is a perspective view of a seat cushion frame of a vehicle seat according to a first embodiment of the present invention. FIG. 1 is a perspective view of the seat cushion frame of the vehicle seat according to the first embodiment of the present invention, with the pan frame removed. FIG. 2 is a top view of the seat cushion frame of the vehicle seat according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA in FIG. 1 and is an explanatory diagram showing the positional relationship between first and second subsidence suppressing members according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along line BB in FIG. 1, and is an explanatory diagram showing the positional relationship between first and second subsidence suppressing members according to the first embodiment of the present invention. FIG. 3 is a perspective view of a seat cushion frame of a vehicle seat according to a second embodiment of the present invention. FIG. 11 is a top view of a seat cushion frame of a vehicle seat according to a second embodiment of the present invention. 2 is a cross-sectional view taken along the line AA in FIG. 1, illustrating the positional relationship between the first and second subsidence suppression members according to the second embodiment of the present invention. FIG. It is a perspective view of the seat cushion frame of the vehicle seat based on the modification of the first embodiment of the present invention. FIG. 4 is a perspective view of a seat frame of a vehicle seat according to a first modified example of the present invention. FIG. 11 is a schematic diagram for explaining an arrangement of an impact absorbing member in a seat frame of a vehicle seat according to a first modified example of the present invention. FIG. 11 is a schematic diagram for explaining an arrangement of an impact absorbing member in a seat frame of a vehicle seat according to a first modified example of the present invention. FIG. 11 is a schematic diagram for explaining an arrangement of an impact absorbing member in a seat frame of a vehicle seat according to a first modified example of the present invention. FIG. 11 is a perspective view of a seat frame of a vehicle seat according to a second modified example of the present invention. FIG. 7 is a schematic diagram for explaining the arrangement of shock absorbing members in a seat frame of a vehicle seat according to a second modified example of the present invention. FIG. 11 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the second modified example of the present invention. FIG. 11 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the second modified example of the present invention. It is a perspective view of the seat frame of the vehicle seat concerning the 3rd modification of the present invention. FIG. 7 is a schematic diagram for explaining the arrangement of shock absorbing members in a seat frame of a vehicle seat according to a third modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the third modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the third modified example of the present invention. It is a perspective view of the seat frame of the vehicle seat concerning the 4th modification of the present invention. FIG. 7 is a schematic diagram for explaining the arrangement of shock absorbing members in a seat frame of a vehicle seat according to a fourth modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the fourth modified example of the present invention. FIG. 7 is a schematic diagram for explaining the arrangement of shock absorbing members in a seat frame of a vehicle seat according to a fourth modified example of the present invention. FIG. 13 is a perspective view of a seat frame of a vehicle seat according to a fifth modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the fifth modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the fifth modified example of the present invention. FIG. 13 is a schematic diagram for explaining the arrangement of the impact absorbing member in the seat frame of the vehicle seat according to the fifth modified example of the present invention. FIG. 2 is a perspective view of a resin box serving as a shock absorbing member. FIG. 2 is a sectional view taken along the line AA in FIG. 1, and is an explanatory diagram showing an outline of shock absorption using a resin box and an airbag. FIG. 2 is a perspective view of a resin box provided with ribs. FIG. 1 is a perspective view of a resin box with cylindrical ribs. It is an explanatory view showing a cylindrical rib. FIG. 1 is a perspective view of a resin box having honeycomb-shaped ribs. FIG. 2 is a sectional view taken along the line AA in FIG. 1, and is an explanatory diagram showing an outline of shock absorption using a resin plate and an airbag. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, illustrating an overview of impact absorption using a resin plate, a pan frame, and an airbag. FIG. 2 is a sectional view taken along the line AA in FIG. 1, and is an explanatory diagram showing an outline of shock absorption using a pan frame and an airbag. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and is a schematic cross-sectional view showing an overview of impact absorption using a pan frame and an airbag separated in the front-rear direction. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and is a schematic cross-sectional view showing an overview of impact absorption using a pan frame and an airbag separated in the front-rear direction. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and is a schematic cross-sectional view showing an overview of impact absorption using a pan frame and an airbag separated in the front-rear direction.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle seat according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to FIGS. 1 to 24. The vehicle seat according to the present embodiment will be explained using a vehicle seat mounted on a vehicle as an example, but is limited to a vehicle seat mounted on a ground vehicle having wheels such as an automobile or a railway. It may be a seat mounted on an aircraft, a ship, etc. that moves other than on the ground.

Note that the embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shapes, dimensions, arrangement, etc. of the members described below may be changed and improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

Regarding terms indicating directions in this specification, each direction is defined as shown in FIG. Specifically, in the following description, "front-back direction" means the front-back direction when viewed from the person sitting in the vehicle seat, and is a direction that coincides with the traveling direction of the vehicle. The term "seat width direction" refers to the width direction of the vehicle seat, which corresponds to the left-right direction when viewed from the person sitting on the vehicle seat. Furthermore, the term "vertical direction" refers to the height direction of the vehicle seat, and corresponds to the vertical direction when the vehicle seat is viewed from the front.

[1. Configuration of the 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 1a removed for convenience of illustration.

The vehicle seat S includes a seat cushion S1 that serves as a sitting part that supports the buttocks of the seated person, a seatback S2 that serves as a backrest that supports the back of the seated person, and a seat cushion S2 that serves as a backrest portion that supports the back of the seated person. The main component is a headrest S3 that supports the headrest S3. The seat cushion S1 is constructed by placing a cushion pad 1b on a seat cushion frame 10 serving as a skeleton shown in FIG. 2, and further covering the cushion pad 1b with a trim cover 1a. 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 1a. The headrest S3 is formed by arranging a padding material (not shown) on a core material (not shown) and covering it with a trim cover 1a.

The cushion pad of the seat cushion S1 and the seat back S2 is a urethane base material formed by foam molding using a urethane foam material. The trim cover 1a of the seat cushion S1 includes a first hanging part 2a (right side hanging part) provided on the right side of the seat cushion and extending in the front-back direction, and a second hanging part 2a (right-side hanging part) provided on the left side of the seat cushion and extending in the front-back direction. A hanging part 2b (left hanging part), a third hanging part 2c (front hanging part) provided on the front side of the seat cushion and extending in the seat width direction, and a third hanging part 2c (front hanging part) provided on the rear side of the seat cushion and extending in the seat width direction. An extending fourth hanging portion 2d (rear hanging portion) is provided. Further, as will be described later, thin portions each having a thickness thinner than the surrounding area are provided at positions corresponding to each of the hanging portions 2a to 2d of the cushion pad 1b.

[2. Seat cushion frame of the first embodiment]
The configuration of a seat cushion frame 10 according to a first embodiment of the present invention will be described with reference to Figures 2 and 3. The seat cushion frame 10 is supported by legs (not shown), to which inner rails are attached, and is assembled in a sliding manner between the legs and an outer rail installed on the vehicle floor so that the position can be adjusted in the front-rear direction. The rear end of the seat cushion frame 10 is connected to a seat back frame (not shown) via a reclining mechanism (not shown).

In this embodiment, as shown in FIG. 2, the seat cushion frame 10 has an external shape that is roughly a rectangular frame when viewed from above. The main components of the seat cushion frame 10 are a pair of side frames 11 that respectively form the left and right ends in the seat width direction, a pan frame 12 that forms the front end of the seat cushion frame 10, and a connecting pipe 13 (pipe frame) that connects the left and right side frames 11 at their rear ends.

The two (pair) side frames 11 are spaced apart in the left-right direction to define the width of the seat cushion frame 10, and are arranged to extend in the front-rear direction. A connecting pipe 13 is attached to the rear side of the side frames 11, and the left and right side frames 11 are connected at the rear by the connecting pipe 13.

Further, the pan frame 12 is fixedly joined to the front sides of the pair of side frames 11, and the left and right side frames 11 are connected to each other at the front sides by the pan frame 12. More specifically, the left and right ends of the pan frame 12 are each fixed to a flange 11a provided on the side frame 11 by a fixing means such as welding.

The pan frame 12 is mainly used to support the thighs of a seated person (occupant), and is a frame made of a metal plate having a substantially rectangular shape with a substantially flat upper surface. As shown in FIG. 2 and FIG. 5, which will be described later, the pan frame 12 includes a front bent part 12a whose front end is bent downward, and a rear bent part 12b which is bent downward at its rear end 12e. It is equipped with Further, a support surface 12c having a substantially flat upper surface is provided between the front bent portion 12a and the rear bent portion 12b. Note that the ends of the support surface 12c in the left and right direction are each fixed to the flange 11a of the side frame 11 (FIG. 2).

The end of the trim cover 1a is engaged with the lower end of the forward bent portion 12a of the pan frame 12. The means for engaging the trim cover 1a with the forward bent portion 12a is a known method such as a trim cord. As shown in FIG. 2, a protrusion 12d is provided on the top surface of the pan frame 12.

Next, a description will be given with reference to FIG. 3, which shows the seat cushion frame 10 with the pan frame 12 removed, together with FIG. 2. A front spring 14a and a rear spring 14b (supporting members) are arranged behind the rear end portion 12e of the pan frame 12. The front spring 14a and the rear spring 14b are suspended horizontally between the left and right side frames 11, and both ends of the front spring 14a and the rear spring 14b are respectively locked to locking parts 11b provided on the side frame 11. Ru. The locking portion 11b is formed between two holes spaced apart in the front-rear direction, and the portion sandwiched between the holes bulges toward the inside of the side frame 11. Then, the end of the front spring 14a or the rear spring 14b is inserted through one hole, a part of the spring is placed along the bulged portion, and then the end is inserted into the other hole.

The front spring 14a and the rear spring 14b are arranged so that when the seat cushion frame 10 is viewed from directly above (that is, in a plan view), they are spaced apart from each other by a predetermined distance and their extending directions are substantially parallel. Further, a position corresponding to the ischial tuberosity of the seated person is supported between the front spring 14a and the rear spring 14b (in a space separated by a predetermined distance). That is, the front spring 14a and the rear spring 14b are spaced apart from each other at least to the extent that they are not located directly below the ischial tuberosity.

The front springs 14a and rear springs 14b are linear members formed in a wavy (zigzag) shape, etc., and mainly support the buttocks of a seated person. The ends of the front springs 14a and rear springs 14b are supported by the left and right side frames 11, respectively, and the cushion pad 1b is placed above the front springs 14a and rear springs 14b. In other words, the front springs 14a and rear springs 14b function as support members that support the cushion pad 1b.

As shown in FIG. 3, the seat cushion frame 10 of this embodiment has a submarine structure for suppressing the submarine phenomenon in which the body of a person seated on the vehicle seat S slides forward and downward when the vehicle has a frontal collision. A pipe 15 (first sinking suppression member) is provided. The submarine pipe 15 is provided between the left and right side frames 11 at a position forward of the front spring 14a. Further, the submarine pipe 15 is arranged at a position ahead of the rear end portion 12e and the rear bent portion 12b of the pan frame 12. Further, the submarine pipe 15 is disposed below the pan frame 12, specifically below the support surface 12c and convex portion 12d of the pan frame 12.

When an impact such as a frontal collision occurs, the seated person sinks and the seated person's pelvis (lower back) rotates too much, which can cause a compressive load on the spine. In this embodiment, the seat cushion frame 10 is provided with an additional pipe 16 as a second sinking suppression member to suppress excessive rotation of the pelvis (lower back) as the seated person sinks when an impact such as a frontal collision occurs. The additional pipe 16 is provided between the left and right side frames 11, at a position rearward and below the submarine pipe 15 and forward of the connecting pipe 13. The additional pipe 16 is also located rearward of the rear end portion 12e and rear bend portion 12b of the pan frame 12.

Note that FIG. 3 shows an example in which the additional pipe 16 is provided between the front spring 14a and the rear spring 14b in the fore-and-aft direction, but the position of the additional pipe 16 in the fore-and-aft direction is not particularly limited as long as it is between the submarine pipe 15 and the connecting pipe 13 and is a position that can prevent the pelvis (lower back) of the seated person from rotating during a frontal collision.

According to the seat cushion frame 10 of this embodiment in which the additional pipe 16 is arranged, when the cushion pad 1b is crushed and the seated person sinks in during a frontal collision, the additional pipe extending in the left-right direction (seat width direction) Due to the presence of the additional pipe 16, the impact generated in the direction of sinking the seated person is absorbed by the additional pipe 16. Therefore, it is possible to suppress the rotation of the pelvis (lumbar region) of the seated person and suppress the compressive load applied to the spine. That is, in the event of a frontal collision, the submarine pipe 15 can prevent the seated person from sinking forward and downward, and the additional pipe 16 can prevent the seated person's lower back (pelvis) from sinking. In addition, since the additional pipe 16 is provided at a position closer to the lower back of the seated person behind the rear end 12e of the pan frame 12, the pelvis (lower back) rotates as the seated person sinks in the event of a frontal collision. This effectively prevents overexertion.

[3. Second sinking suppression member (high hardness portion) provided in the seat cushion pad]
Hereinafter, the second sinking suppression member (high hardness portion) provided in the cushion pad 1b of the seat cushion S1 according to this embodiment will be described with reference to Fig. 4 to Fig. 6. Fig. 4 is a top view of the seat cushion frame 10, Fig. 5 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 6 is a cross-sectional view taken along line B-B in Fig. 1.

As an example of the second sinking suppression member (high hardness portion) provided in the cushion pad 1b of the seat cushion S1 according to this embodiment, a plate-shaped resin plate 17 will be described. The resin plate 17 is provided on the underside or in a position close to the underside of the cushion pad 1b, and is a plate-shaped resin molded product made of a material harder than the base material (urethane foam, which is a urethane material) constituting the cushion pad 1b. The resin plate 17 is injection molded while being inserted into the base material constituting the cushion pad 1b. Since the resin plate 17 is molded and integrated with the cushion pad 1b, there is no need to separately attach the resin plate 17 to the molded cushion pad 1b, which has the advantage of improving workability.

As shown in the top view of the seat cushion frame 10 in FIG. 4, the resin plate 17 has a front end surface 17a at the front, a rear end surface 17b at the rear, a right end surface 17c facing the right side frame 11, and a left side end surface 17a. It has a left end surface 17d facing the frame 11. Further, as shown in FIG. 5, the resin plate 17 has an upper surface portion 17e and a lower surface portion 17f.

In a plan view of the seat cushion frame 10 from above, the resin plate 17 is arranged above the additional pipe 16, as shown in FIG. Further, as shown in FIGS. 4 and 5, the resin plate 17 is arranged so as to at least partially overlap the additional pipe 16 in the vertical direction. In other words, at least a portion of the resin plate 17 is located at the same position as the additional pipe 16 in the front-rear direction. Furthermore, as shown in FIG. 4, the resin plate 17 is arranged so as to at least partially overlap the front spring 14a and the rear spring 14b, which are supporting members that support the cushion pad 1b in the vertical direction.

Further, in the seat longitudinal direction, the additional pipe 16 is located between the front end surface 17a and the rear end surface 17b of the resin plate 17, and the front end surface 17a of the resin plate 17 is positioned rearward than the rear end of the submarine pipe 15. It is composed of Further, at least a portion of the resin plate 17 is located at the same position as the additional pipe 16 in the left-right direction (sheet width direction). In other words, the resin plate 17 is arranged so as to straddle the additional pipe 16 in the front-rear direction.

As shown in FIG. 5, the plastic plate 17 is arranged so as to be located between the front thin portion 1c provided on the cushion pad 1b and the additional pipe 16 in the up-down direction. Also, as shown in FIG. 6, the plastic plate 17 is provided between the left and right thin portions of the cushion pad 1b, i.e., the right thin portion 1e and the left thin portion 1f, in the seat width direction (seat left-right direction) (the seat center side with respect to the left and right thin portions). In other words, the plastic plate 17 is provided between the left and right hanging portions provided on the trim cover 1a, i.e., the first hanging portion 2a and the second hanging portion 2b, in the seat width direction (seat left-right direction) (the seat center side with respect to the left and right hanging portions).

In the seat cushion frame 10 of the present embodiment, the resin plate 17 is arranged at such a position, so that when the seated person sinks in during a frontal collision, the downward displacement of the resin plate 17 is caused by the resin plate 17 The lower surface of the seat member 16 is prevented from coming into surface contact with the additional pipe 16, thereby suppressing excessive rotation of the pelvis (lumbar region) of the seated person. In detail, as shown in FIGS. 5 and 6, when the resin plate 17 is displaced downward, the lower surface portion 17f comes into contact with the additional pipe 16, thereby distributing the load and causing the downward displacement of the resin plate 17. is prevented. Therefore, the generation of compressive load on the spine due to excessive rotation of the seated person's pelvis (lumbar region) is suppressed.

Here, it is preferable that the resin plate 17 is configured to transmit a load to each of the submarine pipe 15 and the additional pipe 16 when it is displaced due to a collision, since the load is dispersed. For example, in FIG. 4, the front end surface 17a of the resin plate 17 can be configured to be located forward of the submarine pipe 15, and the resin plate 17 can be provided so as to straddle the submarine pipe 15 and the additional pipe 16. In this case, when the resin plate 17 is displaced due to a collision, the load is transmitted to each of the submarine pipe 15 and the additional pipe 16, dispersing the load, and it is possible to effectively prevent the pelvis (lower back) from rotating too much as the seated person sinks. Therefore, it is possible to suppress the compressive load generated on the spine of the seated person.

In FIG. 5, the distance between the line connecting the upper end of the submarine pipe 15 and the upper end of the additional pipe 16 and the lower surface 17f of the resin plate 17 increases toward the rear, but this is not limited to the above, and the distance between the line connecting the upper end of the submarine pipe 15 and the upper end of the additional pipe 16 and the lower surface 17f of the resin plate 17 may be constant or may become narrower toward the rear.

In a configuration that allows adjustment of the height (up-down adjustment) and the front-to-back position (slide adjustment) of the seat cushion S1, if the additional pipe 16 is configured to face the resin plate 17 (high hardness portion), this is preferable because it makes it possible to prevent the lower back from rotating too much as the seated person sinks down, without being affected by the height (up-down position) or front-to-back position of the seat cushion S1.

In addition, when the height adjustment (vertical adjustment) or longitudinal position adjustment (slide adjustment) of the seat cushion S1 is performed, the resin plate 17 (high hardness part) follows the additional pipe 16 in the vertical direction and the longitudinal direction. If the seat cushion S1 is configured to be displaced, it is possible to prevent the seated person's pelvis (lumbar region) from rotating too much without being affected by the height (vertical position) or longitudinal position of the seat cushion S1. This is preferable because it makes it possible.

[4. Seat cushion frame of the second embodiment]
In the first embodiment, the seat cushion frame of the vehicle seat has been described as an example having a submarine pipe as a first sinking suppression member (e.g., a seat cushion frame of a front seat), whereas in the second embodiment, a seat cushion frame (a seat cushion frame of a front seat or a seat cushion frame of a rear seat) that does not have a submarine pipe will be described.

Hereinafter, a seat cushion frame according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 9. Only the configurations that are different from the first embodiment will be described, and the other configurations will be omitted because they are the same as the configurations of the first embodiment.

Figure 7 shows a perspective view of a seat cushion frame 10' of a vehicle seat according to a second embodiment. The seat cushion frame 10' differs from the first embodiment in that it does not have a member equivalent to a submarine pipe. The seat cushion frame 10' according to the second embodiment has a high hardness portion below the cushion pad 1b' that is harder than the material of the cushion pad 1b'. When the resin plate 17' (high hardness portion) is displaced downward during a frontal collision, the resin plate 17' comes into contact with a sinking suppression member provided on the seat cushion frame 10' or the vehicle body, preventing the resin plate 17' from being displaced downward, thereby suppressing excessive rotation of the pelvis (lower back) as the seated person sinks.

Examples of the sinking suppressing member provided on the seat cushion frame 10' or the vehicle body include any member that can suppress downward displacement of the resin plate 17' (high hardness part) provided on the cushion pad 1b'. For example, the frame piece 18', an additional pipe 16', or a vehicle body (not shown) may be used, but the present invention is not limited to these.

As shown in FIG. 7, the additional pipe 16' is provided between the front end (front frame 12') of the seat cushion frame 10' and the connecting pipe 13 (pipe frame) at the rear end of the seat cushion frame 10' in the seat front-rear direction. The frame piece 18' is provided between the left and right side frames 11' and is a frame member that connects the left and right side frames 11' in the seat width direction, and is provided between the front end (front frame 12') of the seat cushion frame 10' and the connecting pipe 13 (pipe frame) at the rear end of the seat cushion frame 10' in the seat front-rear direction.

Further, the frame piece 18' is provided between the left and right side frames 11' at a position in front of the front spring 14a', and the additional pipe 16' is provided between the left and right side frames 11' at a position behind the front spring 14a'. It is provided between frames 11'.

As shown in FIG. 8, in a plan view of the seat cushion frame 10' from above in the seat vertical direction, the resin plate 17' is disposed at a position above the frame piece 18' and the additional pipe 16'. Further, in the seat longitudinal direction, the front end surface 17a' of the resin plate 17' is located forward of the frame piece 18', and the rear end surface 17b of the resin plate 17' is located rearward of the additional pipe 16'. has been done.

According to the seat cushion frame 10' of the vehicle seat according to the second embodiment, when a seated person sinks in during a frontal collision, the downward displacement of the resin plate 17' causes the sinking suppressing member (frame piece 18 ', the additional pipe 16', or the vehicle body (not shown), thereby suppressing excessive rotation of the pelvis (lumbar region) of the seated person. Specifically, as shown in FIG. 9, downward displacement of the lower surface portion 17f' of the resin plate 17' is prevented by a sinking suppressing member (frame piece 18', additional pipe 16', or vehicle body (not shown)). This prevents the waist from rotating too much as the seated person sinks down.

[5. Modified example]
The present invention is not limited to the embodiments described above. Below, modified examples of the seat cushion frame and seat cushion according to the present embodiment will be described.

In the above embodiment, as shown in FIG. 2, an example is shown in which the ends of the support members (front spring 14a and rear spring 14b) that support the cushion pad 1b are attached to the left and right side frames 11, respectively. However, the arrangement of the support members is not limited to this. For example, as shown in FIG. 10, a spring 14' serving as a support member may be arranged to extend in the front-rear direction of the seat. Specifically, the spring 14' (supporting It is also possible to arrange

In the above embodiment, as shown in FIG. 5, regarding the height positions (positions in the vertical direction) of the two subsidence suppressing members (submarine pipe 15 and additional pipe 16), the submarine pipe 15 is located higher than the additional pipe 16. Although an example is shown in which the submarine pipe 15 and the additional pipe are provided, the submarine pipe 15 and the additional pipe are not limited to this. 16 may be at the same height, or the additional pipe 16 may be provided at a position above the submarine pipe 15.

Further, in the embodiment shown in FIG. 5, the additional pipe 16 is provided below the rear end 12e and the rear bent portion 12b of the pan frame 12, but The bent portion 12b may be provided below the additional pipe 16. If the rear end portion 12e and the rear bent portion 12b of the pan frame 12 are provided below the additional pipe 16, when the seated person's waist sinks, the rear end portion 12e and the rear bent portion 12b Contact with the seated person via the trim cover 1a and the cushion pad 1b is suppressed.

Furthermore, in the embodiment shown in FIG. 5, the rear end portion 12e and the rear bent portion 12b of the pan frame 12 are provided forward of the additional pipe 16, but the rear end portion 12e and the rear bent portion 12b of the pan frame 12 may be configured to extend to a position rearward of the additional pipe 16.

In the above embodiment, as shown in Figures 3 to 5, the first subsidence suppression member and the second subsidence suppression member (submarine pipe 15 and additional pipe 16) are configured as separate bodies, but it is also possible to form the two subsidence suppression members by integrating them or connecting them together.

In the above embodiment, the additional pipe 16 (second sinking suppression member) is formed as a straight pipe member, but a convex portion may be provided on the rear of the pipe member in the seat front-rear direction, a convex portion may be provided on the upper part of the pipe member in the seat up-down direction, or one side of the cross-sectional shape may be inclined toward the rear or front of the seat relative to the other side. The pipe member may also be formed by connecting two members or joining two half-shaped members.

Furthermore, in the above embodiment, an example was shown in which the diameters and thicknesses of the two pipes of the first sinking suppression member and the second sinking suppression member (the submarine pipe 15 and the additional pipe 16) are different, but this is not limited to this. For example, if the diameter of the submarine pipe 15 is D1 and the thickness is d1, and the diameter of the additional pipe 16 is D2 and the thickness is d2, the diameter may be any of D1>D2, D1=D2, and D1<D2, and the thickness may be any of d1>d2, d1=d2, and d1<d2, so long as it is within a range in which sinking of the seated occupant's lower back is appropriately suppressed when an impact occurs, and the combination of diameter and thickness can also be selected appropriately.

In the above embodiment, an example was shown in which the cushion pad and the resin plate (high hardness portion) were integrated by integral molding, but this is not limited thereto, and a recess may be provided in the cushion pad, and the resin plate may be accommodated in the recess. In addition, while using a resin plate as the high hardness portion is preferable from the viewpoint of weight reduction, a metal plate may be used instead of resin. When metal is used as the material constituting the high hardness portion, it is easy to ensure the necessary rigidity even if the high hardness portion (metal plate) is made smaller.

In the above embodiment, an example was shown in which the plate-shaped high hardness portion (resin plate 17, 17') was integrated with the cushion pad 1b, 1b' by integral molding, but the method of attachment to the cushion pad is not limited to this, and the plate-shaped high hardness portion may be attached to a coarse blanket as a backing material attached to the underside of the cushion pad. In this case, by providing fine irregularities on the surface (upper surface) and ends of the plate-shaped high hardness portion that comes into contact with the cushion pad, the plate-shaped high hardness portion is prevented from falling off from the underside of the cushion pad.

Further, as the material constituting the high-hardness portion, it is also possible to use a substance that is normally soft but exhibits dilatancy properties that harden when subjected to impact. When using a material that exhibits dilatancy, it is normally soft and does not cause discomfort to the seated person, but becomes hard when subjected to an impact such as a frontal collision, causing the seated person to sink and the pelvis (lumbar region) to sink as the seated person sinks. It becomes possible to effectively suppress rotation.

The shape of the high hardness portion such as the resin plate 17 is not limited to a flat shape, and may have a curved shape that curves in the left-right direction (seat width direction). Specifically, the right end face 17c and the left end face 17d of the resin plate 17 may be curved so as to be located below or above the center part of the resin plate 17. The resin plate 17 may also have a curved shape that curves in the front-rear direction. Specifically, the front end face 17a and the rear end face 17b of the resin plate 17 may be curved so as to be located below or above the center part of the resin plate 17. If the resin plate 17 is curved, when the high hardness portion, which is a plate-shaped member, is displaced downward during a frontal collision, the center part or end part of the resin plate 17 comes into contact with the additional pipe 16 to distribute the load, and the downward displacement of the resin plate 17 is prevented, so that the waist of the seated person is appropriately prevented from rotating too much. Furthermore, it is possible to thin the left and right side portions (right end surface 17c and left end surface 17d) of the high hardness portion of the resin plate 17, or to thin the center portion.

In the above embodiment, an example was shown in which the plate-shaped high hardness portion (resin plate 17, 17') was provided on the cushion pad 1b, 1b', but the high hardness portion may be provided somewhere other than the cushion pad. Specifically, the plate-shaped high hardness portion may be attached by hooking the left and right ends of the plate-shaped high hardness portion onto the left and right side frames 11, respectively, and the lower surface of the plate-shaped high hardness portion may be supported by the front spring 14a and the rear spring 14b, thereby installing the plate-shaped high hardness portion on the seat cushion.

In the above embodiment, an example was described in which a resin plate was used as the high hardness portion provided in the cushion pad, but the form of the high hardness portion is not limited to this. For example, the high hardness portion may be a coarse blanket that is attached to the lower surface of the cushion pad and serves as a backing material that is harder than the urethane base material. In addition, when the high hardness part is displaced downward, the parts that come into contact with subsidence prevention members (additional pipes, frame members, vehicle bodies, etc.), specifically, additional pipes with lining materials such as coarse blankets, The hardness of the portion facing the frame member, vehicle body, etc. may be increased. Blanket, felt, pressed felt, or non-woven fabric can be used as the backing material, but some areas of these backing materials may be sprayed or impregnated with a material harder than urethane, such as resin. The hardness can be increased by

In the above embodiment, an example was shown in which the resin plate was applied to the seat cushion frame shown in FIG. 2, but the resin plate (sinking suppressing member, high hardness part, shock absorbing member) may also be applied to other seat frames. It is possible. Hereinafter, seat frames for vehicle seats according to modified examples (first to fifth modified examples) will be described with reference to FIGS. 11A to 15D. Note that in FIGS. 11A to 15D, the thickness of the resin plate is omitted from illustration.

(Seat Frame of Vehicle Seat According to First Modification)
First, an outline of the configuration of the seat frame will be described with reference to Fig. 11A. As shown in Fig. 11A, the seat frame S100 is mainly composed of a seat cushion frame 110 and a seat back frame 120. The seat cushion frame 110 forms the framework of the seating portion of the vehicle seat, and the seat back frame 120 forms the framework of the backrest portion of the vehicle seat.

The seat cushion frame 110 has a rectangular frame-like external shape when viewed from above. The seat cushion frame 110 includes side frames 111 and 112 that form the ends in the seat width direction, a pan frame 113 that forms the front end of the seat cushion frame 110, a right side frame 111, a left side frame 112, The main component is a connecting pipe 114 that connects the rear ends of the two.

As shown in FIG. 11A, a submarine pipe 115 is provided between the left and right side frames 111 and 112 at a position rearward of the pan frame 113. Further, a spring 116 serving as a support member is arranged to extend in the front-rear direction of the seat. Specifically, the front end of the spring 116 is attached to the submarine pipe 115, and the rear end of the spring 116 is attached to the connecting pipe 114, so that the spring 116 (supporting member) is arranged in the front-rear direction of the seat. .

11A, the seatback frame 120 is configured in a frame shape with a right side frame 121 and a left side frame 122 that are spaced apart from each other and extend in the longitudinal direction (up-down direction), a plate-shaped upper frame 123 that connects the upper ends of the side frames 121, 122, a connecting pipe 124 that rotatably connects the seat cushion frame 110 and the seatback frame 120, and a lower frame 125 (lower member) that connects the lower ends of the side frames 121, 122. A pillar support portion is provided on the upper frame 123, and a headrest pillar is inserted into the pillar support portion to attach the headrest.

A pressure receiving member 126 is disposed inside the frame-shaped seat back frame 120 to support the occupant's upper body and suppress the occupant from sinking. The pressure receiving member 126 is a plate-shaped member made of resin or the like. As shown in FIG. 11A, the pressure receiving member 126 is connected to the upper frame 123 and the lower frame 125 by a connecting wire 127.

Examples of the arrangement of the plastic plates relative to the seat frame S100 will be described with reference to Figures 11B to 11D. In the example shown in Figure 11B, the plastic plate 117a is arranged so as to overlap the spring 116 (support member) in the seat front-rear direction and the seat width direction of the seat cushion frame 110. In addition, the plastic plate 117b is arranged so as to overlap the pressure-receiving member 126 in the seat up-down direction and the seat width direction of the seatback frame 120.

In the example shown in FIG. 11C, the resin plate 117a is arranged to overlap the spring 116 (support member) and the submarine pipe 115 in the seat longitudinal direction and the seat width direction of the seat cushion frame 110. Further, the resin plate 117b is arranged to overlap the pressure receiving member 126 in the seat up-down direction and the seat width direction of the seat back frame 120.

In the example shown in FIG. 11D, the resin plate 117a is arranged so as to overlap the spring 116 (support member), the submarine pipe 115, and the pan frame 113 in the seat front-rear direction and the seat width direction of the seat cushion frame 110. In addition, the resin plate 117b is arranged so as to overlap the lower frame 125 (lower member) and the pressure-receiving member 126 in the seat up-down direction and the seat width direction of the seatback frame 120.

(Seat frame of vehicle seat according to second modification)
First, with reference to FIG. 12A, an overview of the configuration of the seat frame according to the second modification will be described. As shown in FIG. 12A, the seat frame S200 is mainly composed of a seat cushion frame 210 and a seat back frame 220. The seat cushion frame 210 forms the skeleton of the seating portion of the vehicle seat, and the seat back frame 220 forms the skeleton of the backrest portion of the vehicle seat.

The seat cushion frame 210 has a rectangular external shape when viewed from above. The main components of the seat cushion frame 210 are side frames 211, 212 that form the ends in the seat width direction, and a pan frame 213 that forms the front end to the rear end of the seat cushion frame 210. As shown in FIG. 12A, the pan frame 213 has a bottom surface 214.

As shown in FIG. 12A, the seatback frame 220 is configured in a frame shape with a right side frame 221 and a left side frame 222 that are spaced apart from each other and extend in the longitudinal direction (up-down direction), an upper frame 223 that connects the upper ends of the side frames 221, 222, and a connecting pipe 224 that rotatably connects the seat cushion frame 210 and the seatback frame 220. A pillar support portion is provided on the upper frame 223, and a headrest pillar is inserted into the pillar support portion to attach the headrest.

Pressure-receiving members 225, 226 that support the upper body of the occupant and prevent it from sinking are arranged inside the seat back frame 220, which is formed in a frame shape. The pressure-receiving member 225 is a plate-shaped member made of resin or the like. The pressure-receiving member 226 is made of a planar spring (Plumaflex) and is held in a state where it is suspended by a wire or the like from the upper frame 223.

An example of the arrangement of the resin plate with respect to the seat frame S200 will be described with reference to FIGS. 12B to 12D. In the example shown in FIG. 12B, the resin plate 217a is arranged so as to overlap the bottom surface 214 of the pan frame 213 in the seat longitudinal direction and the seat width direction of the seat cushion frame 210. Further, the resin plate 217b is arranged to overlap the pressure receiving member 226 in the seat up-down direction and the seat width direction of the seat back frame 220.

In the example shown in FIG. 12C, the resin plate 217a is arranged so as to overlap the bottom surface 214 and the front portion of the pan frame 213 in the seat longitudinal direction of the seat cushion frame 210. Further, the resin plate 217b is arranged to overlap both the pressure receiving member 225 and the pressure receiving member 226 in the seat up-down direction and the seat width direction of the seat back frame 220.

In the example shown in FIG. 12D, the resin plate 217a is arranged to overlap the entire pan frame 213 including the bottom surface 214 in the seat longitudinal direction and the seat width direction of the seat cushion frame 210. Further, the resin plate 217b is arranged to overlap both the pressure receiving member 225 and the pressure receiving member 226 in the seat up-down direction and the seat width direction of the seat back frame 220.

(Seat Frame of Vehicle Seat According to Third Modification)
First, an outline of the configuration of the seat frame according to the third modified example will be described with reference to Fig. 13A. As shown in Fig. 13A, the seat frame S300 is mainly composed of a seat cushion frame 310 and a seat back frame 320. The seat cushion frame 310 forms the framework of the seating portion of the vehicle seat, and the seat back frame 320 forms the framework of the backrest portion of the vehicle seat.

The seat cushion frame 310 has a rectangular outer shape when viewed from above. Its main components are side frames 311, 312 that form the ends in the seat width direction, a pan frame 313 that forms the front end of the seat cushion frame 310, and a connecting pipe 314 that connects the rear ends of the right side frame 311 and the left side frame 312.

As shown in FIG. 13A, four springs 315 serving as support members are arranged to extend in the front-rear direction of the seat. Specifically, the front end of the spring 315 is attached to the pan frame 313, and the rear end of the spring 315 is attached to the connecting pipe 314, so that the spring 315 (supporting member) is arranged in the front-rear direction of the seat. .

As shown in FIG. 13A, the seatback frame 320 is configured in a frame shape with a right side frame 321 and a left side frame 322 that are spaced apart from each other and extend in the longitudinal direction (up and down direction), an upper frame 323 that connects the upper ends of the side frames 321, 322, and a connecting pipe 324 that rotatably connects the seat cushion frame 310 and the seatback frame 320. A pillar support portion is provided on the upper frame 323, and a headrest pillar is inserted into the pillar support portion to attach the headrest.

A lower bracket 325 that connects the left and right side frames at a lower position and an upper bracket 326 that connects the left and right side frames at an upper position are provided inside the seat back frame 320, which is formed in a frame shape, in the seat width direction. In addition, pressure receiving members 327, 328 that support the upper body of the occupant and prevent sinking are arranged inside the seat back frame 320, which is formed in a frame shape. The pressure receiving member 327 is a plate-shaped member made of resin or the like. The pressure receiving member 328 is made of a planar spring (Plumaflex), and is held in a state where it is suspended from the upper bracket 326 by a wire or the like.

An example of the arrangement of the resin plate with respect to the seat frame S300 will be described with reference to FIGS. 13B to 13D. In the example shown in FIG. 13B, the resin plate 317a is arranged to overlap with the inner two of the four springs 315 in the seat longitudinal direction and the seat width direction of the seat cushion frame 310. Further, the resin plate 317b is arranged to overlap the pressure receiving member 328 in the seat up-down direction and the seat width direction of the seat back frame 320.

In the example shown in FIG. 13C, the resin plate 317a is arranged so as to overlap the four springs 315 in the seat front-rear direction and the seat width direction of the seat cushion frame 310. In addition, the resin plate 317b is arranged so as to overlap both the pressure receiving member 327 and the pressure receiving member 328 in the seat up-down direction and the seat width direction of the seatback frame 320.

In the example shown in FIG. 13D, the resin plate 317a is arranged to overlap the pan frame 313 and the four springs 315 in the seat longitudinal direction and the seat width direction of the seat cushion frame 310. Further, the resin plate 317b is arranged to overlap with the upper bracket 326, the pressure receiving member 327, and the pressure receiving member 328 in the seat up-down direction and the seat width direction of the seat back frame 320.

(Seat frame of vehicle seat according to fourth modification)
First, an overview of the configuration of a seat frame according to a fourth modification will be described with reference to FIG. 14A. As shown in FIG. 14A, the seat frame S400 is mainly composed of a seat cushion frame 410 and a seat back frame 420. The seat cushion frame 410 forms the skeleton of the seating portion of the vehicle seat, and the seat back frame 420 forms the skeleton of the backrest portion of the vehicle seat.

The seat cushion frame 410 has a rectangular outer shape when viewed from above. The seat cushion frame 410 includes side frames 411 and 412 that constitute ends in the seat width direction, a pan frame 413 that constitutes the front end of the seat cushion frame 310, a right side frame 411, and a left side frame 412. The main component is a connecting pipe 414 that connects the rear ends of the two.

As shown in FIG. 14A, four springs 415 serving as support members are arranged to extend in the front-rear direction of the seat. Specifically, the front ends of the springs 415 are attached to the pan frame 413, and the rear ends of the springs 415 are attached to the connecting pipe 414, so that the springs 415 (support members) are arranged in the front-rear direction of the seat.

As shown in FIG. 14A, the seat back frame 420 includes a right side frame 421 and a left side frame 422 that are spaced apart from each other left and right and extend in the longitudinal direction (up and down direction), and the side frames 421 and 422. It is configured in a frame shape by an upper frame 423 that connects the upper end portions, and a connecting pipe 424 that rotatably connects the seat cushion frame 410 and the seat back frame 420. The upper frame 423 is provided with a pillar support part, a headrest pillar is inserted into the pillar support part, and the headrest is attached.

Inside the frame-shaped seatback frame 420, there are a lower bracket 425 that connects the left and right side frames at a lower position, and an upper bracket 426 that connects the left and right side frames at an upper position in the seat width direction. It is provided. Further, a pressure receiving member 427 is disposed inside the frame-shaped seat back frame 420 to support the upper body of the occupant and suppress the seatback from sinking. The pressure receiving member 427 is provided between the lower bracket 425 and the upper bracket 426 in the vertical direction of the seat back frame 420, and is suspended horizontally between the left and right side frames 421 and 422.

An example of the arrangement of the plastic plate relative to the seat frame S400 will be described with reference to Figures 14B to 14D. In the example shown in Figure 14B, the plastic plate 417a is arranged so as to overlap with the four springs 415 in the seat front-rear direction and the seat width direction of the seat cushion frame 410. In addition, the plastic plate 417b is arranged so as to overlap with the pressure-receiving member 427 in the seat up-down direction and the seat width direction of the seatback frame 420.

In the example shown in FIG. 14C, the resin plate 417a is arranged so as to overlap the four springs 415 in the seat front-rear direction and the seat width direction of the seat cushion frame 410. In addition, the resin plate 417b is arranged so as to overlap both the upper bracket 426 and the pressure receiving member 427 in the seat up-down direction and the seat width direction of the seatback frame 420.

In the example shown in FIG. 14D, the resin plate 417a is arranged so as to overlap the pan frame 413 and the four springs 415 in the seat front-rear direction and the seat width direction of the seat cushion frame 410. In addition, the resin plate 417b is arranged so as to overlap the lower bracket 425, the upper bracket 426, and the pressure-receiving member 427 in the seat up-down direction and the seat width direction of the seatback frame 420.

(Seat Frame of Vehicle Seat According to Fifth Modification)
First, an outline of the configuration of the seat frame according to the fifth modified example will be described with reference to Fig. 15A. As shown in Fig. 15A, the seat frame S500 is mainly composed of a seat cushion frame 510 and a seat back frame 520. The seat cushion frame 510 forms the framework of the seating portion of the vehicle seat, and the seat back frame 520 forms the framework of the backrest portion of the vehicle seat.

The seat cushion frame 510 has a rectangular outer shape when viewed from above. Its main components are side frames 511, 512 that form the ends in the seat width direction, a pan frame 513 that forms the front end of the seat cushion frame 510, and a connecting pipe 514 that connects the rear ends of the right side frame 511 and the left side frame 512.

As shown in FIG. 15A, four springs 515 serving as support members are arranged to extend in the front-rear direction of the seat. Specifically, the front end of the spring 515 is attached to the pan frame 513, and the rear end of the spring 515 is attached to the connecting pipe 514, so that the spring 515 (supporting member) is arranged in the front-rear direction of the seat. .

As shown in FIG. 15A, the seat back frame 520 includes a right side frame 521 and a left side frame 522, which are spaced apart from each other to the left and right and extend in the longitudinal direction (up and down direction), and the side frames 521 and 522. It is configured in a frame shape by an upper frame 523 that connects the upper end portions, and a connecting pipe 524 that rotatably connects the seat cushion frame 510 and the seat back frame 520. The upper frame 523 is provided with a pillar support part, a headrest pillar is inserted into the pillar support part, and the headrest is attached.

A lower bracket 525 that connects the left and right side frames at a lower position is provided in the seat width direction on the inside of the seat back frame 520, which is formed in a frame shape. A pressure-receiving member 526 that supports the upper body of the occupant and prevents it from sinking is also provided on the inside of the seat back frame 520, which is formed in a frame shape. The pressure-receiving member 526 is made of a planar spring (Plumaflex), and is held in a state where it is suspended by a wire or the like from a wire member 527 attached to the upper frame 523.

Examples of the arrangement of the plastic plates relative to the seat frame S500 will be described with reference to Figures 15B to 15D. In the example shown in Figure 15B, the plastic plate 517a is arranged so as to overlap the inner two of the four springs 515 in the seat front-rear direction and the seat width direction of the seat cushion frame 510. In addition, the plastic plate 517b is arranged so as to overlap the pressure-receiving member 526 in the seat up-down direction and the seat width direction of the seatback frame 520.

In the example shown in FIG. 15C, the resin plate 517a is arranged to overlap the four springs 515 in the seat longitudinal direction and the seat width direction of the seat cushion frame 510. Further, the resin plate 517b is arranged to overlap both the pressure receiving member 526 and the wire member 527 in the seat up-down direction and the seat width direction of the seat back frame 520.

In the example shown in FIG. 15D, the resin plate 517a is arranged so as to overlap the pan frame 513 and the four springs 515 in the seat front-rear direction and the seat width direction of the seat cushion frame 510. In addition, the resin plate 517b is arranged so as to overlap the lower bracket 525, the pressure receiving member 526, and the wire member 527 in the seat up-down direction and the seat width direction of the seatback frame 520.

The seat frames of the vehicle seats according to the first to fifth modified examples have been described above with reference to Figs. 11A to 15D. In the seat frames of the vehicle seats according to the first to fifth modified examples, if the resin plate is arranged only in an area that overlaps with the pressure-receiving member (planar spring or spring) made of a spring or the plate-shaped pressure-receiving member, the seating comfort of the seated occupant (passenger) during normal seating is prevented from decreasing.

Further, in the seat frame of the vehicle seat according to the first to fifth modified examples, the resin plate may include a pressure receiving member (a planar spring or a spring), a bracket (an upper bracket or a lower bracket provided on the seat back frame). If the seat cushion is arranged so that it overlaps with the pan frame of the seat cushion, the resin will Since the plate is supported by the pressure receiving member, the bracket, and the pan frame, it is possible to improve the energy absorption effect.

(Shock absorption using resin box)
In the above embodiment, the resin plate is used to improve the energy absorption effect, but it is also possible to use a box-shaped resin box instead of the resin plate. For example, a box-shaped resin box 27 as shown in FIG. 16 may be used instead of the resin plate 17. At this time, the resin box 27 can also have a closed box shape with an upper surface.

(Shock absorption using resin boxes and airbags)
Here, by combining the resin box 27 with an airbag, when an impact such as a collision occurs, the resin box 27 as an impact absorbing member can be moved toward the occupant by the airbag, so that the impact can be absorbed at an early stage and the load on the occupant can be suppressed. Specifically, as shown in the upper diagram of Figure 17, the resin box 27 is disposed behind the rear bent portion 12b of the pan frame 12 in the seat front-rear direction, and the airbag module ABM is disposed below the bottom surface of the resin box 27.

As shown in the middle diagram of Figure 17, when an impact occurs, the airbag AB is inflated, causing the plastic box 27 to rise toward the occupant. When the seated occupant sinks due to a collision, the plastic box 27 moves toward the occupant and is crushed as shown in the bottom diagram of Figure 17, absorbing the impact on the seated occupant.

(Resin box with ribs)
Here, the resin box 27 as the shock absorbing member can be appropriately changed in shape, etc., and for example, as in the resin box 27X shown in FIG. 18A, a rib 27Xa standing from the bottom surface inside can be provided to effectively absorb shock. Here, if a slit is provided in the rib 27Xa, shock can be absorbed more effectively. Also, as in the resin box 27Y shown in FIG. 18B, it is possible to arrange a plurality of cylindrical ribs 27Ya side by side. At this time, as shown in FIG. 18C, a slit 27Yb may be provided in the cylindrical rib 27Ya. Furthermore, as in the resin box 27Z shown in FIG. 18D, it is also possible to provide a honeycomb-shaped rib 27Za inside.

(Shock absorption using resin plate and airbag)
In addition, as shown in the upper diagram of FIG. 19, an airbag module ABM is arranged below the bottom surface of the resin plate 17, and when an impact occurs, the airbag AB is inflated and the resin plate 17 is raised toward the passenger side. Good too. When the seated person sinks due to a collision, the resin plate 17 moves toward the occupant as shown in the lower diagram of FIG. 19, and the impact generated on the seated person is absorbed.

(Shock absorption using movable frame and airbags)
It is also possible to absorb the impact by moving a part of the pan frame 12 together with the plastic plate 17. Specifically, as shown in the upper diagram of Fig. 20, the rear part 12B of the pan frame 12 is arranged to be located rearward of the front end surface 17a of the plastic plate 17 in the seat front-rear direction. Then, in the seat up-down direction, the airbag module ABM is arranged below the position where the rear part 12B of the pan frame and the plastic plate 17 overlap. At this time, the rear part 12B of the pan frame is configured to be rotatable with respect to the front part 12A of the pan frame 12 on the rotation shaft 12C.

When an impact occurs, the airbag AB is inflated, causing the rear portion 12B of the pan frame and the plastic plate 17 to rise toward the occupant. When the seated occupant sinks due to a collision, the plastic plate 17 and the rear portion 12B of the pan frame move toward the occupant, as shown in the lower diagram of Figure 20, absorbing the impact on the seated occupant.

At this time, as shown in the upper diagram of FIG. 21, only the rear portion 12B of the pan frame 12 may be raised by the airbag AB without providing the resin plate 17 (lower diagram of FIG. 21).

(Shock absorption using a frame with a fragile part and an airbag)
Also, as shown in the upper diagram of FIG. 22, the pan frame 12X may be configured to include a front portion 12A and a rear portion 12B that can rotate about a rotation shaft 12C with respect to the front portion 12A, and a guide pin 12E provided in the rear portion 12B may be inserted into a hole 12D (weak portion) provided in the front portion 12A. Here, the hole 12D narrows toward the rear side. As shown in the lower diagram of FIG. 22, when the airbag AB inflates and the rear portion 12B rotates upward, the guide pin 12E enters and is held in the narrowed portion of the hole 12D. With this configuration, when the seated person sinks due to a collision, the area around the hole 12D in the front portion 12A of the pan frame 12X is deformed, so that the impact on the seated person is effectively absorbed.

Further, like the pan frame 12Y shown in the upper diagram of FIG. 23, the front part 12A is provided with a groove 12F and a recess 12G in which the guide pin 12E of the rear part 12B engages, so that when the airbag AB is inflated, Even if the guide pin 12E of the rear part 12B moves and fits into the recess 12G (lower view of FIG. 23), it moves downward so as to destroy the slit 12H (fragile part) provided below the recess 12G. good. According to such a configuration, when the seated person sinks due to a collision, the area around the slit 12H of the front portion 12A of the pan frame 12Y is destroyed, so that the impact generated on the seated person is effectively absorbed. Ru.

(Shock absorption using frame with ratchet and airbag)
Further, like the pan frame 12Z shown in the upper diagram of FIG. 24, by providing a convex portion 12I at the rear end of the front portion 12A and providing ratchet teeth 12J at the front end of the rear portion 12B of the pan frame 12Z, the airbag AB When the rear part 12B is expanded and then contracted, the rear part 12B may move downward so that the ratchet teeth 12J collide with the convex part 12I of the front part 12A (from the middle diagram to the bottom diagram in FIG. 24). According to such a configuration, when the seated person sinks due to a collision, the ratchet teeth 12J of the rear portion 12B collide with the convex portion 12I of the front portion 12A, so that the impact generated on the seated person is effectively reduced. be absorbed.

The seat cushion according to the present embodiment has been described above using as an example the seat cushion of a vehicle seat mounted in a vehicle. The seat cushion according to the present embodiment is not limited to a seat cushion for a vehicle seat, but is applicable to a seat where a shock may occur to a seated person, in particular, a seat cushion that may sink into the seated person's lumbar region when a shock occurs. There are no particular restrictions on the use as long as it is a seat cushion for the seat to be obtained. For example, the seat cushion of the present invention can also be used as a seat cushion for a vehicle seat used in a vehicle other than a vehicle.

S Vehicle seats (vehicle seats)
S1 seat cushion 1a trim cover 1b cushion pad 1c front thin portion 1d rear thin portion 1e right thin portion 1f left thin portion 2a first hanging portion (right hanging portion)
2b Second hanging part (left hanging part)
2c Third hanging part (front hanging part)
2d Fourth hanging part (rear hanging part)
S2 Seat back S3 Headrest 10, 10' Seat cushion frame 11, 11' Side frame 11a, 11a' Flange 11b, 11b' Locking portion 12, 12X, 12Y, 12Z Pan frame 12a Front bent portion 12b Rear bent portion 12c Support surface 12d Convex portion 12e Rear end portion 12A Front portion 12B Rear portion 12C Rotation shaft 12D Hole (weak portion)
12E Guide pin 12F Groove 12G Recess 12H Slit (weakened part)
12I Convex portion 12J Ratchet teeth 12' Front frame 13, 13' Connecting pipe (pipe frame)
14a, 14a' Front spring (support member)
14b, 14b' Rear spring (support member)
14' Spring (support member)
15 Submarine pipe (first submersion suppression member)
16, 16' Additional pipe (second sinking suppression member)
17, 17' Resin plate (second sinking suppression member, high hardness portion)
17a, 17a' Front end surface (front end portion)
17b, 17b' Rear end surface (rear end portion)
17c, 17c' Right end surface (right end portion)
17d, 17d' Left end surface (left end portion)
17e, 17e' Upper surface portion (upper end portion)
17f, 17f' Lower surface (lower end)
18' Frame piece (sinking prevention member)
27, 27X, 27Y, 27Z Resin box (shock absorbing member)
27Xa, 27Ya, 27Za Rib 27Yb Slit ABM Airbag module AB Airbag S100 Seat frame 110 Seat cushion frame 111, 112 Side frame 113 Pan frame 114 Connecting pipe 115 Submarine pipe 116 Spring (support member)
Reference Signs List 120 Seat back frame 121, 122 Side frame 123 Upper frame 124 Connecting pipe 125 Lower frame 126 Pressure receiving member 127 Connecting wire 117a, 117b Resin plate S200 Seat frame 210 Seat cushion frame 211, 212 Side frame 213 Pan frame 214 Bottom surface 220 Seat back frame 221, 222 Side frame 223 Upper frame 224 Connecting pipe 225, 226 Pressure receiving member 217a, 217b Resin plate S300 Seat frame 310 Seat cushion frame 311, 312 Side frame 313 Pan frame 314 Connecting pipe 315 Spring (support member)
320 Seat back frame 321 Side frame 322 Side frame 323 Upper frame 324 Connecting pipe 325 Lower bracket 326 Upper bracket 327, 328 Pressure receiving member 317a, 317b Resin plate S400 Seat frame 410 Seat cushion frame 411, 412 Side frame 413 Pan frame 414 Connecting pipe 415 Spring (support member)
420 Seat back frame 421, 422 Side frame 423 Upper frame 424 Connecting pipe 425 Lower bracket 426 Upper bracket 427 Pressure receiving member 417a, 417b Resin plate S500 Seat frame 510 Seat cushion frame 511, 512 Side frame 513 Pan frame 514 Connecting pipe 515 Spring (support member)
520 Seat back frame 521, 522 Side frame 523 Upper frame 524 Connecting pipe 525 Lower bracket 526 Pressure receiving member 527 Wire members 517a, 517b Resin plate

According to the vehicle seat of the present invention, the problem is solved by a vehicle seat including a seat cushion, wherein the seat cushion includes a seat cushion frame, a cushion pad placed on the seat cushion frame, and a seat cushion. , the seat cushion frame includes a first sinking suppressing member that suppresses sinking of a seated person, and a second sinking suppressing member provided behind the first sinking suppressing member. , the cushion pad is provided with a thin wall portion, the second sinking suppressing member is an air bag, and the air bag is provided at a position that overlaps the thin wall portion in the vertical direction. This is solved by

In the above configuration, the seat cushion frame may have a pan frame at a front end , and the thin portion may be thinner than the cushion pad at an upper portion of the pan frame.

In addition, in the above configuration, the thin portion may be thinner than the thickness of the cushion pad on the upper part of the front flat surface portion of the pan frame.

Further, in the above configuration, the seat cushion frame is connected at the rear by a connecting pipe, and the thin wall portion is provided thinner than the thickness of the cushion pad at an intermediate position between the thin wall portion and the connecting pipe. Good to have.

Further, in the above configuration, the thin portion may be provided rearward than a rear end portion of the rear bent portion of the pan frame.

In the above configuration, the seat cushion frame may have an impact absorbing portion provided with a weak portion, and the airbag may be provided at a position overlapping with the impact absorbing portion in the vertical direction.

Further, in the above configuration, the cushion pad is covered with a trim cover,
The trim cover may be provided with a hanging portion, and the thin portion may be disposed at a position corresponding to the hanging portion in the longitudinal direction of the vehicle seat.

The above-mentioned object is also attained by providing a vehicle seat comprising a seat cushion serving as a seating portion that supports the buttocks of a seated occupant, a seat back serving as a backrest that supports the back of the seated occupant, and a headrest that is disposed on an upper portion of the seat back and supports the head of the seated occupant, the seat cushion having a seat cushion frame, a cushion pad placed on the seat cushion frame, and a trim cover that covers the cushion pad, the seat back having a seat back frame, a back pad placed on the seat back frame, and a trim cover that covers the back pad, the headrest having a core material, a pad material disposed on the core material, and a trim cover that covers the pad material. The seat cushion frame is supported by legs, an inner rail is attached to the legs, and the seat cushion frame is assembled in a sliding manner so that the position can be adjusted in the fore-aft direction between an outer rail installed on the vehicle floor, the rear end of the seat cushion frame is connected to the seat back frame via a reclining mechanism, the seat cushion frame is provided with a first sinking suppression member that suppresses sinking of the seat occupant, and a second sinking suppression member different from the first sinking suppression member, the cushion pad is provided with a thin-walled portion, and the second sinking suppression member is an airbag, and the airbag is provided in a position that overlaps with the thin-walled portion in the vertical direction.

Claims (10)

A vehicle seat having a seat cushion,
The seat cushion includes a seat cushion frame and
a cushion pad placed on the seat cushion frame,
The seat cushion frame includes a first sinking suppression member that suppresses sinking of a seated occupant,
a second sinking suppression member provided rearward of the first sinking suppression member. The seat cushion frame includes a pan frame for supporting the thighs of a seated occupant,
2. The vehicle seat according to claim 1, wherein the second sinking suppression member is provided rearward of a rear end portion of the pan frame. 3. The vehicle seat according to claim 1, wherein the second sinkage suppressing member is provided below the first sinking suppressing member. a high hardness portion having a harderness than a urethane base material of the cushion pad is provided below the cushion pad,
The vehicle seat according to any one of claims 1 to 3, wherein the high hardness portion is arranged so as to overlap at least a portion of the second sinking suppression member in the up-down direction of the vehicle seat. The vehicle seat according to claim 4, characterized in that the high hardness portion is arranged so as to overlap at least a portion of a support member that supports the cushion pad in the vertical direction of the vehicle seat. The vehicle seat according to claim 4 or 5, wherein the high hardness portion is a plate-shaped member disposed to straddle the second sinkage suppressing member in the front-rear direction of the vehicle seat. . The vehicle seat according to any one of claims 4 to 6, characterized in that the high hardness portion is a resin molded part. The vehicle seat according to any one of claims 4 to 7, characterized in that the high hardness portion is integrated with the cushion pad. 9. The high hardness portion is disposed between a thin portion provided on the cushion pad and the second sinkage suppressing member in the vertical direction of the vehicle seat. The vehicle seat described in any one of the above. The vehicle seat according to claim 6, characterized in that the high hardness portion, which is a plate-shaped member, is curved in the width direction of the vehicle seat.

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