JP7529966B2 - Vehicle seats - Google Patents

Description

The present invention relates to a vehicle seat, and in particular to a vehicle seat that can absorb the shock applied to the seated occupant when an impact such as a collision occurs.

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

JP 2002-46513 A

In the vehicle seat described in Patent Document 1, the cross member serving as the impact absorbing member is disposed on the seat cushion frame, specifically, on the seat cushion side frame, so the width of the seat cushion frame had to be large.

The present invention was made in consideration of the above problems, and its purpose is to provide a vehicle seat that is small and compact while adequately absorbing the shock that occurs to the seated occupant when an impact such as a collision occurs.

The above problem is solved by the vehicle seat of the present invention, which provides a vehicle seat equipped with a seat cushion, the seat cushion having a seat cushion frame including a pair of side frames spaced apart in the width direction of the vehicle seat, a seat cushion pad placed on the seat cushion frame, and an impact absorbing member provided below the seat cushion pad, the impact absorbing member being disposed between the pair of side frames in the width direction of the vehicle seat, the impact absorbing member having a hollow portion, the impact absorbing member being supported from below by a support member, the seat cushion pad being covered by a skin material, and the hollow portion of the impact absorbing member being disposed at a position avoiding a hanging portion of the skin material .

In the seat cushion of the present invention configured as described above, the impact absorbing member is supported from below by the supporting member, so that an increase in size is suppressed and an impact absorbing effect is stably exhibited.
Furthermore, when the load during shock absorption is transmitted to the shock absorbing member, the influence of the hanging portion is suppressed.

Furthermore , the above problem is solved by the vehicle seat of the present invention, which provides a vehicle seat equipped with a seat cushion, the seat cushion having a seat cushion frame including a pair of side frames spaced apart in the width direction of the vehicle seat, a seat cushion pad placed on the seat cushion frame, an impact absorbing member provided below the seat cushion pad, and a sensor member, the impact absorbing member being disposed between the pair of side frames in the width direction of the vehicle seat, the impact absorbing member having a hollow portion, the impact absorbing member being supported from below by a support member, and the hollow portion of the impact absorbing member being disposed in a position avoiding the sensor member.
In the seat cushion of the present invention configured as described above, the impact absorbing member is supported from below by the supporting member, so that an increase in size is suppressed and an impact absorbing effect is stably exhibited.
Furthermore, when the load during shock absorption is transmitted to the shock absorbing member, the influence of the sensor member is suppressed.

In the above configuration, a part of a lower surface of the impact absorbing member may be housed in a recess of the support member.
In the above configuration, a portion of the lower surface of the impact absorbing member is housed in the recess of the support member, thereby stabilizing the position of the impact absorbing member.
Furthermore, in the above configuration, the impact absorbing member is positioned between a forward bent portion that is bent upward to form the front end of the recess of the support member, and a rearward bent portion that is bent upward or downward to form the rear end of the recess of the support member, and the lower surface of the impact absorbing member is positioned in a position that avoids the forward bent portion and the rearward bent portion of the support member.
In the above-described configuration, the shock absorbing member is disposed at a position that avoids the bent portion of the support member, so that shock absorption is performed stably.

In the above configuration, a part of an upper surface of the impact absorbing member may be housed in a pad recess of the seat cushion pad.
In the above configuration, a part of the upper surface of the impact absorbing member is housed in the pad recess of the seat cushion pad, so that the position of the impact absorbing member is stabilized.

In the above configuration, the impact absorbing member may be disposed rearward of a sinking suppression member extending in a width direction of the vehicle seat.
In the above configuration, when a load during shock absorption is transmitted to the shock absorbing member, the influence of the submersion suppression member, such as a submarine pipe, is suppressed.

In the above configuration, a plate-like member may be provided at a position opposite to the upper surface of the impact absorbing member.
In the above-described configuration, the plate-shaped member is provided on the upper surface of the impact absorbing member, so that the load of the occupant is stably transmitted to the impact absorbing member.

In the above configuration, it is preferable that no metal member is disposed between the upper surface of the impact absorbing member and the seat cushion pad.
In the above-described configuration, since no metal member is disposed between the impact absorbing member and the seat cushion pad above the impact absorbing member, the load of the occupant is stably transmitted to the impact absorbing member.

In the above configuration, the hollow portion of the impact absorbing member may be formed as a recess, and the recess may be provided so as to extend in a vertical direction.
In the above-described configuration, the extending direction of the recess of the impact absorbing member is aligned with the load input direction from the occupant, so that the impact absorbing effect is exhibited more stably.

In the above configuration, the hollow portion of the impact absorbing member may be formed as a recess, and the recess may have an opening on a lower surface of the impact absorbing member.
In the above-described configuration, the lower surface of the impact absorbing member is open, so that the load from the upper surface can be stably received, and the load is stably transmitted to the impact absorbing member.

Furthermore, in the above configuration, the hollow portion of the impact absorbing member is formed as a recess, a portion of the upper surface of the impact absorbing member is stored in a pad recess of the seat cushion pad, and at least a portion of the hollow portion of the impact absorbing member is positioned at the same height position as the pad recess in the vertical direction of the vehicle seat.
In the above-described configuration, the cavity of the impact absorbing member is at the same height (within the same horizontal plane) as the pad recess, so that the portion of the impact absorbing member surrounded by the pad recess is protected from the horizontal direction.

In addition, in the above configuration, the seat cushion frame may be formed of a resin material, and the impact absorbing member may be surrounded by the seat cushion frame in the fore-and-aft direction of the vehicle seat and in the width direction of the vehicle seat.
In the above-described configuration, since the impact absorbing member is surrounded by the resin seat cushion frame, the impact absorbing member can be easily positioned.

According to the vehicle seat of the present invention, the impact absorbing member is supported from below by the support member, so that an increase in size is suppressed, and an impact absorbing effect is stably exhibited.
Furthermore, according to the vehicle seat of the present invention, a portion of the lower surface of the impact absorbing member is housed in the recess of the support member, thereby stabilizing the position of the impact absorbing member.
Furthermore, according to the vehicle seat of the present invention, the shock absorbing member is disposed at a position that avoids the bent portion of the support member, so that shock absorption is performed stably.
Furthermore, according to the vehicle seat of the present invention, a portion of the upper surface of the impact absorbing member is housed in the pad recess of the seat cushion pad, thereby stabilizing the position of the impact absorbing member.
Furthermore, according to the vehicle seat of the present invention, the influence of subsidence suppression members such as submarine pipes is suppressed when a load during shock absorption is transmitted to the shock absorbing member.
Furthermore, according to the vehicle seat of the present invention, the plate-like member is provided on the upper surface of the impact absorbing member, so that the load of the occupant is stably transmitted to the impact absorbing member.
Furthermore, according to the vehicle seat of the present invention, since no metal member is disposed between the seat cushion pad and above the impact absorbing member, the load of the occupant is stably transmitted to the impact absorbing member.
Furthermore, according to the vehicle seat of the present invention, the influence of the hanging portion is suppressed when the load during shock absorption is transmitted to the shock absorbing member.
Furthermore, according to the vehicle seat of the present invention, the influence of the sensor member is suppressed when the load during shock absorption is transmitted to the shock absorbing member.
Furthermore, according to the vehicle seat of the present invention, the extending direction of the recessed portion of the impact absorbing member is aligned with the load input direction from the occupant, so that the impact absorbing effect is exhibited more stably.
Furthermore, according to the vehicle seat of the present invention, the lower surface of the impact absorbing member is open, so that the load from the upper surface can be stably received, and the load is transmitted to the impact absorbing member stably.
Furthermore, according to the vehicle seat of the present invention, the hollow portion of the impact absorbing member is at the same height position (within the same horizontal plane) as the pad recess, so that the portion of the impact absorbing member surrounded by the pad recess is protected from the horizontal direction.
Furthermore, according to the vehicle seat of the present invention, the impact absorbing member is surrounded by the seat cushion frame made of resin, so that the impact absorbing member can be easily positioned.

1 is an external view of a vehicle seat according to a first and second embodiment of the present invention; 1 is an external view of a vehicle seat according to a first embodiment of the present invention; 2 is a cross-sectional view taken along line AA in FIG. 1, illustrating a structure around an impact absorbing member provided in the vehicle seat according to the first embodiment of the present invention. FIG. 1 is an external view of an impact absorbing member provided in a vehicle seat according to a first embodiment of the present invention; 1 is a schematic diagram showing an internal structure of an impact absorbing member included in a vehicle seat according to a first embodiment of the present invention; 1 is a schematic diagram showing an internal structure of an impact absorbing member included in a vehicle seat according to a first embodiment of the present invention; 3 is a schematic diagram showing the positional relationship between an impact absorbing member and a hanging portion of a cover material included in the vehicle seat according to the first embodiment of the present invention; FIG. 2 is a schematic diagram showing a positional relationship between an impact absorbing member and a sensor member included in the vehicle seat according to the first embodiment of the present invention; FIG. FIG. 6 is an exploded view showing a configuration of a seat cushion of a vehicle seat according to a second embodiment of the present invention. 11 is an external view showing a configuration of a resin seat cushion frame included in a seat cushion of a vehicle seat relating to a second embodiment of the present invention. FIG. 6B is a cross-sectional view taken along the line BB in FIG. 6A, and is an explanatory diagram showing the configuration of a resin seat cushion frame provided in a seat cushion of a vehicle seat relating to a second embodiment of the present invention. FIG. FIG. 11 is a top view of a seat cushion of a vehicle seat according to a second embodiment of the present invention. FIG. 7B is a cross-sectional view taken along the line CC of FIG. 7A, illustrating the configuration of a seat cushion of a vehicle seat according to a second embodiment of the present invention. FIG. 11 is a schematic cross-sectional view of an impact absorbing member according to a first modified example. FIG. 11 is a schematic cross-sectional view of an impact absorbing member according to a first modified example. FIG. 11 is a schematic cross-sectional view of an impact absorbing member according to a first modified example. 2 is an explanatory diagram showing a structure around an impact absorbing member provided in a vehicle seat according to a first modified example of the present invention, corresponding to the AA cross-sectional view of FIG. 1; 11 is a schematic cross-sectional view showing a positional relationship between an impact absorbing member and a seat cushion pad according to a first modified example. FIG. FIG. 11 is a schematic cross-sectional view showing an impact absorbing member and a support member according to a first modified example. 11 is a schematic cross-sectional view showing the positional relationship between the impact absorbing member according to the first modified example and a blower and a wire frame. FIG. 11 is a schematic diagram showing the positional relationship between the impact absorbing member according to the first modified example, and the harness and the application area of the noise suppression agent. FIG. 11 is a schematic cross-sectional view showing the positional relationship between an impact absorbing member and a harness according to a first modified example. FIG. FIG. 11 is a schematic partial cross-sectional view of an impact absorbing member according to a second modified example. FIG. 11 is a schematic partial cross-sectional view of an impact absorbing member according to a second modified example. 13 is an external view of an impact absorbing member according to a third modified example. FIG. 13 is a schematic diagram showing the internal structure of an impact absorbing member according to a third modified example. FIG. 13 is an external view of an impact absorbing member according to a third modified example. FIG. 13 is a schematic diagram showing the internal structure of an impact absorbing member according to a third modified example. FIG. FIG. 11 is an exploded view showing the configuration of a shock absorbing portion according to another embodiment of the present invention. 13 is a schematic diagram showing a configuration of an impact absorbing device according to another embodiment of the present invention. FIG. FIG. 11 is a schematic diagram showing a state in which an impact absorbing device according to another embodiment of the present invention is applied to a vehicle seat.

The vehicle seat according to the first and second embodiments of the present invention (hereinafter, the present embodiment) will be described below with reference to Figs. 1 to 21. As the vehicle seat according to the present embodiment, a rear seat for a vehicle mounted on a vehicle will be taken as an example for description, but the vehicle seat is not limited to a rear seat for a vehicle mounted on a ground-traveling vehicle having wheels such as an automobile or train, and may be a front seat for a vehicle, a second-row seat of a three-row seat, or a seat mounted on an aircraft or ship that travels other than on the ground.

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.

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

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

The seat cushion S1 is constructed by placing a seat cushion pad S11 on a seat cushion frame, which serves as the skeleton, and then covering the seat cushion pad S11 with a trim cover S12. As shown in FIG. 1B, the seat cushion frame has a seat cushion side frame S14. The seat back S2 is constructed by placing a cushion pad (not shown) on a seat back frame (not shown) and covering it with a trim cover S12. The headrest S3 is formed by placing a pad material (not shown) on a core material (not shown) and covering it with a trim cover S12.

The seat cushion pad S11 of the seat cushion S1 and the seat back pad of the seat back S2 are made of a urethane base material formed by foam molding using a urethane foam material. The trim cover S12 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, thin-walled portions that are thinner than the surrounding areas are provided at positions corresponding to the hanging portions T1 to T3 of the seat cushion pad S11.

[2. Seat cushion of the first embodiment]
The configuration of the seat cushion S1 of the vehicle seat S according to the first embodiment of the present invention will be described with reference to Figures 2 to 4B. Note that the trim cover S12 is omitted in Figure 2. As shown in Figure 2, which is a cross-sectional view taken along line A-A in Figure 1A, an impact absorbing member 20 is provided below the seat cushion pad S11. As shown in Figures 2 to 3B, the impact absorbing member 20 is provided with a hollow portion 23 as a through-hole between an upper surface 21 and a lower surface 22. An inclined surface 21a is formed on the upper surface 21 of the impact absorbing member 20, which is inclined downward as it approaches the rear.

The shock absorbing member 20 is disposed inward of a pair of seat cushion side frames S14 that are spaced apart in the seat width direction (FIG. 1B). More specifically, the shock absorbing member 20 is disposed below the seat cushion pad S11 and at a substantially central position between the pair of seat cushion side frames S14 in the seat width direction (FIG. 1B). The shock absorbing member 20 is, for example, a urethane molded product, has a higher hardness than the seat cushion pad S11, which is a urethane pad, and includes a hollow portion 23 that collapses when a certain load value is exceeded to absorb shock.

The impact absorbing member 20 is supported from below by a plate-like member 10, which is a support member. The plate-like member 10 is a plate-like member that constitutes a floor that supports the rear seat of a vehicle from below, and has a recess 11 that is recessed downward near the thighs of the occupant. In addition, a protrusion 12 that protrudes upward from the recess 11 is formed at the front end of the plate-like member 10.

The lower surface 22 of the shock absorbing member 20 is supported from below by the plate-shaped member 10, which is a supporting member, so that the shock absorbing effect is stably exerted. At this time, at least a part of the lower surface 22 of the shock absorbing member 20 is stored in the recess 11 of the plate-shaped member 10, so the position of the shock absorbing member 20 relative to the plate-shaped member 10 is stable.

As shown in FIG. 2, the impact absorbing member 20 is disposed between the forward bent portion 13a and the rearward bent portion 13b in the seat front-rear direction. The forward bent portion 13a is bent upward to form the front end of the recess 11, and the rearward bent portion 13b is bent upward to form the rear end of the recess 11.

As shown in FIG. 2, the seat cushion pad S11 has a pad recess S11b formed on its lower surface S11a, which is recessed upward. At least a portion of the upper surface 21 of the shock absorbing member 20 is stored in the pad recess S11b of the seat cushion pad S11, so that the position of the shock absorbing member 20 relative to the seat cushion pad S11 is stable.

The upwardly protruding protrusion 12 extends in the seat width direction and functions as a sinking suppression member for suppressing the submarine phenomenon in which the body of an occupant seated in the vehicle seat S slides forward and downward during a frontal collision of the vehicle. The impact absorbing member 20 is disposed rearward of the protrusion 12 extending in the seat width direction, so that the effect of the protrusion 12 is suppressed when the load during impact absorption is transmitted to the impact absorbing member 20. The sinking suppression member may be a pipe member (e.g., a submarine pipe) extending in the seat width direction near the front end of the seat.

In addition, no metal members such as seat frame members are disposed between the upper surface 21 of the impact absorbing member 20 and the lower surface S11a of the seat cushion pad S11. Because no metal members are disposed between the impact absorbing member 20 and the seat cushion pad S11 above, the load of the occupant is stably transmitted to the impact absorbing member 20.

As shown in Figures 3A and 3B, the cavity 23 of the shock absorbing member 20 is formed as a cylindrical through-hole (a recess that penetrates from the upper surface 21 to the lower surface 22), and since there are no corners, the moldability (shape) of the shock absorbing member 20 is stable, resulting in a more stable shock absorption effect.

In this case, it is preferable that the surface area of the opening of the cavity 23 of the shock absorbing member 20 on the upper surface 21 exceeds 1/3 of the total surface area of the upper surface 21, and the surface area of the opening of the lower surface 22 exceeds 1/3 of the total surface area of the lower surface 22. In this way, by making the cavity 23 a through hole and making the area of its opening exceed 1/3 of the total surface area of the upper surface 21 or the lower surface 22, the shock absorbing load can be set stably.

In addition, the hollow portion 23 (a recess that penetrates from the upper surface 21 to the lower surface 22) of the shock absorbing member 20 is arranged to extend vertically, and is aligned with the load input direction from the occupant (i.e., the vertical direction of the vehicle seat S), so the shock absorbing effect is exerted more stably.

As shown in FIG. 3C, the hollow portion 23 of the impact absorbing member 20 may be provided so as to extend at an angle from the vertical direction. Specifically, the hollow portion 23 may be inclined from rear to front as it goes from top to bottom. With this configuration, the hollow portion 23 is more in line with the load input direction from the occupant, so that the impact absorption effect is more stable.

The cavity 23 of the shock absorbing member 20 is a cylindrical through hole, but it is preferable that the end shape of the cavity 23 on the upper surface 21 and the lower surface 22 is circular, and it may be a perfect circle or an ellipse.

The seat cushion pad S11 is covered by a trim cover S12 as a skin material, but as shown in FIG. 4A, the shock absorbing member 20 and the cavity 23 are arranged in a position that avoids the hanging parts T1 to T3 of the trim cover S12. Specifically, in a top view of the seat cushion S1, the shock absorbing member 20 and the cavity 23 are arranged between the first hanging part T1 (right hanging part) and the second hanging part T2 (left hanging part) in the seat width direction, and are arranged forward of the third hanging part T3 (rear hanging part) in the seat front-rear direction. With this configuration, the influence of the hanging parts T1 to T3 is suppressed when the load during shock absorption is transmitted to the shock absorbing member 20.

As shown in FIG. 4B, the seat cushion S1 includes a sensor member S13 that detects the state of the seated occupant, and the cavity 23 of the impact absorbing member 20 is positioned to avoid the sensor member S13. Specifically, in a top view of the seat cushion S1, the impact absorbing member 20 and the cavity 23 are positioned between the first sensor unit S13a (right sensor unit) and the second sensor unit S13b (left sensor unit) in the seat width direction, and are positioned forward of the rear portion of the third sensor unit S13c (rear sensor unit) in the seat front-rear direction. With this configuration, the influence of the sensor member S13 (each of the sensors S13a to S13c) is suppressed when the load during impact absorption is transmitted to the impact absorbing member 20.

[3. Seat cushion of second embodiment]
The structure of a seat cushion S1X of a vehicle seat according to a second embodiment of the present invention will be described with reference to Fig. 5 to Fig. 7B. As shown in Fig. 5, the seat cushion S1X is configured by placing a seat cushion pad S11X on a resin seat cushion frame S14X that serves as a skeleton, and further covering the seat cushion pad S11X with a trim cover S12X.

As shown in Figures 6A and 6B, the seat cushion frame S14X has a recess S14Xa that is recessed downward. The recess S14Xa is formed so that its vertical height gradually decreases from the front to the rear (so that the depth of the recess gradually decreases).

The recess S14Xa has a bottom surface S14Xb. As shown in FIG. 6A, the recess S14Xa has a width corresponding to one occupant and is disposed between a pair of seat cushion side frames S14Xc that are spaced apart from each other in the seat width direction.

As shown in Figures 7A and 7B, the recess S14Xa accommodates the shock absorbing member 20X, and the lower surface 22X of the shock absorbing member 20X is supported by the bottom surface S14Xb from below. In other words, the seat cushion frame S14X serves as a support member that supports the shock absorbing member from below.

As shown in Figures 7A and 7B, the impact absorbing member 20X is surrounded by the seat cushion frame S14X in the seat front-rear direction and the seat width direction. This makes it easy to position the impact absorbing member 20X in the seat cushion S1X (in other words, to position the impact absorbing member 20X relative to the seat cushion frame S14X).

In the seat cushion S1X of the vehicle seat according to the second embodiment, the entire seat cushion frame S14X may be made of a blow molded product, and a recess S14Xa may be provided in the area where shock is to be absorbed. Alternatively, the outer shape of the seat cushion frame S14X may be formed of expanded polypropylene (EPP), and the shock absorbing member 20X, which is a blow molded product, may be disposed in the recess S14Xa. Alternatively, the outer shape of the seat cushion frame S14X may be formed of a blow molded product, and the shock absorbing member 20X, which is a urethane molded product, may be disposed in the recess S14Xa.

[4. First Modification]
The present invention is not limited to the above embodiment. A first modified example of the impact absorbing member and the seat cushion according to the present embodiment will be described below with reference to Figs.

The shock absorbing member 20A shown in FIG. 8A is a urethane molded product, and the hollow portion 23A is formed as a recess with a closed surface in the direction of the upper surface 21A. The shock absorbing member 20A has no opening in the upper surface 21A, and the opening of the hollow portion 23A is formed in the lower surface 22A, so that the load from the upper surface 21A is stably received, and the load from the occupant is stably transmitted to the shock absorbing member 20A. In addition, the hollow portion 23A is formed to extend vertically, and the extension direction of the recess is along the load input direction from the occupant, so the shock absorbing effect is exerted more stably.

Also, contrary to the example shown in FIG. 8A, the hollow portion 23A may be formed as a recess with a closed surface in the direction of the lower surface 22A, and in such a case, the lower surface 22A of the shock absorbing member 20 is stably positioned relative to a supporting member such as the plate-shaped member 10.

The shock absorbing members 20B and 20C shown in Figures 8B and 8C are blow molded resin products, and by appropriately setting their outer shape and the number and arrangement of recesses 23B and 23C, it is possible to adjust the load value when they are crushed to absorb shock.

In addition, a plate-like member (not shown) may be provided in a position facing the upper surfaces 21A, 21B, and 21C of the shock absorbing members 20A, 20B, and 20C. With this configuration, the load of the occupant is stably transmitted to the shock absorbing members 20A, 20B, and 20C via the plate-like member.

9, the plate-like member 10 may be provided with a rearward bent portion 13b that is bent gradually downward from the front to the rear. In this case, the lower surface 22 of the impact absorbing member 20 may be positioned so as to avoid the bent portions (the front bent portion 13a and the rearward bent portion 13b). Specifically, the lower surface 22 of the impact absorbing member 20 may be positioned rearward of the front bent portion 13a and forward of the rearward bent portion 13b in the seat front-rear direction. By positioning the impact absorbing member 20 at a position that avoids the bent portions (the front bent portion 13a and the rearward bent portion 13b) of the plate-like member 10 as a support member, impact absorption is performed stably.

As shown in the schematic cross-sectional view of FIG. 10 (vertical cross-sectional view of the seat cushion S1), at least a portion of the upper surface 21 of the impact absorbing member 20 is housed in the pad recess S11b of the seat cushion pad S11, and at least a portion of the cavity 23 of the impact absorbing member 20 is positioned at the same height as the pad recess S11b in the vertical direction of the seat (dotted line in FIG. 10). With this configuration, the portion of the impact absorbing member 20 surrounded by the pad recess S11b is protected from the horizontal direction.

In addition, the pad recess S11b of the seat cushion pad S11 and the cavity 23 of the shock absorbing member 20 may be arranged to avoid being on the same plane; in other words, the cavity 23 of the shock absorbing member 20 may be arranged at a different height from the pad recess S11b in the vertical direction of the seat. With this configuration, it becomes possible to more stably receive the load within the pad recess S11b.

In the above embodiment, the support member is a plate-like member 10 that constitutes a floor that supports the rear seat of the vehicle from below, or a resin seat cushion frame S14X, but the support member may also be a pan frame that is provided with the seat cushion frame.

In addition, in the above embodiment, when the hollow portion of the shock absorbing member is formed as a recess, an inclination angle may be provided so that the lower surface has a wide opening. By providing an inclination angle so that the lower surface has a wide opening, the area that receives the load on the upper surface increases, making it possible to receive the load stably.

In addition, in the above embodiment, when the hollow portion of the shock absorbing member is formed as a recess, an inclination angle may be provided so that the upper surface has a wide opening. By providing an inclination angle so that the upper surface has a wide opening, the lower surface of the shock absorbing member is stably positioned on a support member such as a plate-shaped member.

In the above embodiment, the hollow portion 23 of the shock absorbing member 20 is formed as a cylindrical through-hole (FIGS. 3A and 3B), but the through-hole can also be a rectangular tube. If the through-hole is a rectangular tube, it is possible to make the surface area of the opening on the upper surface 21 or the lower surface 22 larger than in the case of a cylindrical shape.

In the above embodiment and modified examples, the shock absorbing members are made of urethane molded products or blow molded resin products, which are lighter than metal, thereby improving shock absorption while reducing weight.

In the above embodiment and modified examples, the support member is a plate-shaped member 10 or a seat cushion frame S14X, but the support member is not limited to this as long as it can support the impact absorbing member 20 from below. For example, if the support member is a plate-shaped member 10, the support member can be a pan frame provided in the seat cushion frame, a resin plate as a pressure-receiving member, a wooden board, or the like.

In addition, the support member is not limited to a plate-like member that supports the shock absorbing member 20 from below with a surface, so long as it can support the shock absorbing member 20 from below. For example, as shown in FIG. 11, the support member 10Y that supports the shock absorbing member 20 from below may be a pressure-receiving member formed of a linear member such as an S-spring or wire, or may be a cloth-like support member.

No metal member is disposed between the upper surface 21 of the impact absorbing member 20 and the seat cushion pad S11. Specifically, as shown in FIG. 12, the impact absorbing member 20 is disposed to avoid the wire frame WF, which is a metal member. More specifically, the impact absorbing member 20 is disposed at a different position from the wire frame WF in the seat front-rear direction. In other words, the wire frame WF is not disposed above the impact absorbing member 20.

As shown in FIG. 12, the shock absorbing member 20 is preferably positioned to avoid overlapping with the blower B, which is an air blowing device provided below the plate-like member 10 (the protruding portion 12 as the pan frame), in the vertical direction of the seat. Specifically, as shown in FIG. 12, the shock absorbing member 20 is positioned to avoid the blower B. More specifically, the shock absorbing member 20 is positioned at a different position from the blower B in the front-rear direction of the seat. In other words, the blower B is not positioned above or below the shock absorbing member 20. The location where the blower B is positioned narrows the space in the vertical direction of the seat (height direction), but this configuration makes it possible to make the space for the shock absorbing member 20 larger.

As shown in Figs. 13 and 14, the impact absorbing member 20 is preferably arranged to avoid the harness H arranged on the lower surface S11a of the seat cushion pad S11. In other words, the harness H is not arranged above or below the impact absorbing member 20. Here, the harness H is connected to a seat heater, a sensor, etc. (not shown). This configuration prevents the impact absorbing member 20 from interfering with the harness H.

As shown in FIG. 13, the shock absorbing member 20 is preferably positioned on the underside S11a (backside) of the seat cushion pad S11, avoiding the application area N of the noise prevention agent. Here, the noise prevention agent is a material that suppresses the noise generated when the urethane foam constituting the seat cushion pad S11 comes into contact with and rubs against the metal frame member. With this configuration, the effect of the application area N of the noise prevention agent, which is slippery, on the shock absorbing member 20 is suppressed.

[5. Second Modification]
The present invention is not limited to the above embodiment. A second modification of the impact absorbing member and the seat cushion according to the present embodiment will be described below with reference to Figs. 15 and 16. The following description will focus on the differences from the above embodiment.

The shock absorbing member 220 and shock absorbing member 220X are blow molded resin products, and by appropriately setting their external shape and the number and arrangement of recesses (hollow portions), it is possible to adjust the load value when they are crushed to absorb shock.

As shown in FIG. 15, the shock absorbing member 220 has a first recess 221b that is provided so that the upper surface 221 is open, and a second recess 222b that is provided so that the lower surface 222 is open. Here, the first recess 221b and the second recess 222b have a shape with rounded corners.

The first recess 221b and the second recess 222b are provided at positions that avoid the outer wall portion of the shock absorbing member 220. In other words, the first recess 221b and the second recess 222b are provided at positions between the front end and rear end of the shock absorbing member 220, and between the left and right ends (side walls) in the seat width direction.

The first recess 221b has a first bottom surface 221c between the upper surface 221 and the lower surface 222. The second recess 222b has a second bottom surface 222c between the upper surface 221 and the lower surface 222. As shown in FIG. 15, the first bottom surface 221c and the second bottom surface 222c are in contact with each other in the up-down direction. The contact between the first bottom surface 221c and the second bottom surface 222c increases the thickness of the bottom surface of the recess, improving rigidity and improving shock absorption efficiency.

16, the first bottom surface 221c and the second bottom surface 222c may be spaced apart from each other in the vertical direction, and a gap 223c (space portion) may be formed between the first bottom surface 221c and the second bottom surface 222c. By forming the gap 223c (space portion) by separating the first bottom surface 221c and the second bottom surface 222c in the vertical direction, the gap 223c as the space portion functions as an elastic deformation region, making it easier to adjust the shock absorption.

As shown in Figures 15 and 16, the shock absorbing member 220 has a hollow structure, with a front space 223a formed on the front side and a rear space 223b formed on the rear side. In this case, if the rear space 223b is configured to have a larger volume than the front space 223a, it is preferable because the shock absorption is higher on the rear side where the applied shock is greater. Note that the rear space 223b may also be configured to have a smaller volume than the front space 223a.

The shock absorbing member 220 is disposed between a pair of seat cushion side frames S14 in the seat width direction, similar to the shock absorbing member 20 in FIG. 1B. In other words, the first recess 221b and the second recess 222b are provided in the seating area of the occupant.

The shock absorbing member 220 is disposed in the same position as the shock absorbing member 20 in FIG. 4A, and it is preferable that the first recess 221b and the second recess 222b are provided between the center of the seating portion and the upholstery hanging portion (the first hanging portion T1 and the second hanging portion T2) in the seat width direction.

As described above, the second modified example of the impact absorbing member and the seat cushion according to the present embodiment includes the following technical idea.
[1] A vehicle seat S (vehicle seat) having a seat cushion S1,
The seat cushion S1 is
a seat cushion frame including a pair of seat cushion side frames S14 (side frames) spaced apart from each other in a width direction of the vehicle seat S;
A seat cushion pad S11 placed on the seat cushion frame;
An impact absorbing member (220) provided below the seat cushion pad (S11),
The impact absorbing member 220 is disposed between the pair of seat cushion side frames S14 (side frames) in the width direction of the vehicle seat S,
The shock absorbing member 220 has a recess,
The vehicle seat S (vehicle seat) is characterized in that the recess is provided in a seating area for an occupant.

With this configuration, the recess of the impact absorbing member 220 is positioned at the center of the vehicle seat S (where the occupant sits) and between the pair of side frames, enabling stable impact absorption.

[2] The recess is a first recess 221b that is provided so as to open on the upper surface 221 side of the shock absorbing member 220,
The vehicle seat according to the above-mentioned [1], wherein the first recess 221b has a shape with rounded corners.
According to this configuration, the first recess 221b is provided on the upper surface 221 of the shock absorbing member 220 with rounded corners, so that shock absorption is stable.

[3] The recess is a second recess 222b that is provided so as to open on the lower surface 222 side of the impact absorbing member 220,
The vehicle seat according to the above-mentioned [1] or [2], wherein the second recess 222b has a shape with rounded corners.
According to this configuration, the second recess 222b is provided on the lower surface 222 of the shock absorbing member 220 with rounded corners, so that shock absorption is stable.

[4] The vehicle seat described in [2] above, wherein the first recess 221b is provided with a first bottom surface 221c between the upper surface 221 and the lower surface 222 of the impact absorbing member 220.
According to this configuration, the rigidity of the first recess 221b is improved, and thus the impact absorption efficiency is improved.

[5] The vehicle seat described in [3] above, characterized in that the second recess 222b is provided with a second bottom surface 222c between the upper surface 221 and the lower surface 222 of the impact absorbing member 220.
With this configuration, the rigidity of the second recess 222b is improved, and the impact absorption efficiency is improved.

[6] The recess includes a first recess 221b provided so as to open on an upper surface 221 side of the shock absorbing member 220, and a second recess 222b provided so as to open on a lower surface 222 side of the shock absorbing member 220,
The first recess 221b is provided with a first bottom surface 221c.
The second recess 222b is provided with a second bottom surface 222c.
The vehicle seat described in any one of [1] to [5] above, characterized in that the first bottom surface 221c and the second bottom surface 222c are spaced apart from each other in the vertical direction of the vehicle seat S, and a gap 223c (space portion) is formed between the first bottom surface 221c and the second bottom surface 222c.
According to such a configuration, the gap 223c (space portion) functions as an elastic deformation area, making it easy to adjust the shock absorption.

[7] The recess includes a first recess 221b provided so as to open on an upper surface 221 side of the shock absorbing member 220, and a second recess 222b provided so as to open on a lower surface 222 side of the shock absorbing member 220,
The first recess 221b is provided with a first bottom surface 221c.
The second recess 222b is provided with a second bottom surface 222c.
The vehicle seat according to any one of the above [1] to [5], wherein the first bottom surface 221c and the second bottom surface 222c are in contact with each other in the up-down direction of the vehicle seat S.
According to this configuration, the first bottom surface 221c and the second bottom surface 222c increase the thickness of the bottom surface portion, improving rigidity, and thus improving shock absorption efficiency.

[8] The vehicle seat according to any one of the above [1] to [7], characterized in that a plurality of recesses are provided in the center of the impact absorbing member 220.
According to this configuration, by disposing the recess in the center of the shock absorbing member 220, it becomes possible to absorb shock stably.

[9] The vehicle seat described in any one of [1] to [8] above, characterized in that the recess is provided in the width direction of the vehicle seat S between the center of the seating portion and the upholstery hanging portion.
According to this configuration, the recess is disposed between the center of the seat of the occupant and the upholstery hanging portion, so that impact can be absorbed stably.

[10] The vehicle seat according to any one of the above [1] to [9], characterized in that the recess is provided at a position that avoids the outer wall portion of the impact absorbing member 220.
According to this configuration, it is possible to stably form the recess shape, and therefore it is possible to stably absorb impact.

[6. Third Modification]
The present invention is not limited to the above embodiment. Below, a third modification of the impact absorbing member and the seat cushion according to this embodiment will be described with reference to Figures 17A to 18B. In the following description, the differences from the above embodiment will be mainly described.

As shown in Figures 17A to 18B, the impact absorbing member 320 is formed in a box shape with an internal space 320a. In the internal space 320a, multiple plate-shaped rib members 320b are arranged in the seat width direction. In other words, multiple plate-shaped rib members 320b extending in the front-rear and up-down directions are arranged in the internal space 320a.

The shock absorbing member 320 is configured to have an upper surface 321 and a lower surface 322 in the vertical direction, a front surface 323 and a rear surface 324 in the front-rear direction, and a first side surface 325a and a second side surface 325b in the seat width direction.

An upper surface 321 of the impact absorbing member 320 is formed mainly by the rib members 320b. The upper surface 321 has an inclined surface 321a that is inclined downward toward the rear.
A plate-like member 326 is disposed so as to cover the inclined surface 321a.

A plate-shaped member 326 is insert-molded at a position facing the inclined surface 321a of the impact absorbing member 320 on the underside S11a, which corresponds to the backside of the urethane seat cushion pad S11. The plate-shaped member 326 is made of a resin material (polypropylene, high-hardness urethane, etc.) or a metal material (iron, steel, etc.).

The shock absorbing member 320 is disposed between a pair of seat cushion side frames S14 in the seat width direction, similar to the shock absorbing member 20 in FIG. 1B. In other words, each rib member 320b is provided on the seating area of the occupant.

The shock absorbing member 320 has rib members 320b arranged in the internal space 320a so that when a load from an occupant is input and exceeds a certain load value, it collapses to absorb the shock. In the shock absorbing member 320, shock is absorbed mainly by the rib members 320b. The shock absorbing load of the shock absorbing member 320 can be adjusted by changing the thickness of the rib members 320b, connecting the rib members 320b in the seat width direction, providing weak parts in the rib members 320b, etc.

[7. Impact absorbing device according to other embodiments]
The configuration of an impact absorbing device 50 according to another embodiment provided in a vehicle seat S (FIGS. 1A and 1B) of the present invention will be described with reference to FIGS. 19 to 21. FIG.

Figure 19 is an exploded view showing the configuration of the shock absorbing section 51. The shock absorbing section 51 is configured by sandwiching an energy absorbing plate 52, which is configured to deform and absorb shock when a certain load value is exceeded, between a pair of guide members 53. The energy absorbing plate 52 has two grooves formed on its side, making it easy to deform when a load is applied. In addition, the guide member 53 has a notch 53a formed to receive the protruding shaft 54a of the shock absorbing member 54 described below.

Figure 20 is a schematic diagram showing the configuration of the impact absorbing device 50. The impact absorbing device 50 comprises a pair of impact absorbing parts 51 spaced apart in the seat width direction, and an impact absorbing member 54 to which the load from the occupant is applied. The impact absorbing member 54 extends in the seat width direction, and is provided at both ends with protruding shafts 54a that protrude outward.

The protruding shaft 54a is received in the notches 53a provided in the pair of guide members 53 of the shock absorbing section 51, and is placed from above on the upper surface of the energy absorbing plate 52 (energy absorbing member). When a load is applied from above from the state shown in FIG. 20, the shock absorbing member 54 moves downward, and the protruding shaft 54a deforms (as if cutting) the energy absorbing plate 52. At this time, the shock is absorbed as the energy absorbing plate 52 deforms.

Figure 21 is a schematic diagram showing the state in which the impact absorbing device 50 is applied to the vehicle seat S shown in Figures 1A and 1B. As shown in Figure 21, the impact absorbing device 50 is attached to the upper surface of a plate-shaped member 60 (support member) provided below the seat cushion pad S11 of the seat cushion S1. Examples of the plate-shaped member 60 are not particularly limited, and include a plate-shaped member that constitutes a floor that supports the rear seat of the vehicle from below and a pan frame provided on a seat cushion frame. Note that the impact absorbing device 50 is disposed inward in the seat width direction from a pair of seat cushion side frames (not shown) that are provided at a distance from each other.

The shock absorbing member 54 has a load receiving surface 54b that receives the load from the occupant, and is configured to be rotatable downward around a rotation axis 55. The shock absorbing section 51 has a mechanism in which the protruding axis 54a slides downward, making it easy to adjust the load value when shock is absorbed.

The impact absorbing device 50 is structured so that the load from the occupant is received on the load receiving surface 54b (flat surface), and the impact absorbing parts 51 are arranged at two locations on both ends in the width direction of the seat so as to sandwich the load receiving surface 54b, stably absorbing the impact.

The rotation axis 55 of the shock absorbing member 54 is set as a rotation axis separate from the reclining rotation axis of the vehicle seat S. The shock absorbing device 50 can effectively absorb shocks, thereby realizing space saving. In addition, since the protruding axis 54a of the shock absorbing member 54 is a mechanism that slides downward, the operational stability during shock absorption is good. Furthermore, since it is attached to the upper surface of a plate-shaped member 60 provided below the seat cushion pad S11 of the seat cushion S1, it is easy to assemble and maintain.

The vehicle seat S equipped with the impact absorbing device 50 according to the above-mentioned other embodiment is a vehicle seat S (vehicle seat) equipped with a seat cushion S1, the seat cushion S1 having a seat cushion frame (seat cushion side frame S14), a seat cushion pad S11 placed on the seat cushion frame, and an impact absorbing device 50 provided below the seat cushion pad S11, the impact absorbing device 50 having an impact absorbing member 54 extending in the width direction of the vehicle seat S and an energy absorbing member (energy absorbing plate 52) that absorbs a load applied to the impact absorbing member 54 from above, and the impact absorbing device 50 is supported from below by a support member (plate-shaped member 60).

The vehicle seat according to this embodiment has been described above using a vehicle seat as an example. There are no particular limitations on the use of the seat cushion according to this embodiment, so long as it is a seat cushion for a seat where an impact may be applied to a seated occupant, particularly a seat cushion for a seat where the lumbar region of the seated occupant may sink in when an impact occurs. For example, the seat cushion of the present invention can also be used as a seat cushion for a vehicle seat used in a vehicle other than a car.

S Vehicle seats (vehicle seats)
S1 Seat cushion S11 Seat cushion pad S11a Underside S11b Pad recess S12 Trim cover T1 First hanging portion (right side hanging portion)
T2 Second hanging part (left hanging part)
T3 Third hanging part (rear hanging part)
S13 Sensor member S13a First sensor portion (right sensor portion)
S13b Second sensor unit (left sensor unit)
S13c Third sensor unit (rear sensor unit)
S14 Seat cushion side frame (side frame, seat cushion frame)
S2 Seat back S3 Headrest 10 Plate-shaped member (support member)
11: Recess 12: Protrusion (sinking suppression member)
13a Front bent portion (bent portion)
13b Front bent portion (bent portion)
20, 20X, 20A, 20B, 20C Impact absorbing member 21, 21X, 21A, 21B, 21C Upper surface 21a Inclined surface 22, 22X, 22A, 22B, 22C Lower surface 23, 23X, 23A, 23B, 23C Hollow portion S1X Seat cushion S11X Seat cushion pad S11Xa Lower surface S11Xb Pad recess S12X Trim cover S14X Seat cushion frame (support member)
S14Xa Recess S14Xb Bottom surface S14Xc Seat cushion side frame 10Y Support member WF Wire frame B Blower H Harness N Application area of noise prevention agent 220 Impact absorbing member 221 Top surface 221b First recess 221c First bottom surface 222 Bottom surface 222b Second recess 222c Second bottom surface 223a Front space 223b Rear space 223c Gap (space portion)
320 Impact absorbing member 320a Internal space 320b Rib member 321 Upper surface 321a Inclined surface 322 Lower surface 323 Front surface 324 Rear surface 325a First side surface 325b Second side surface 326 Plate-shaped member 50 Impact absorbing device 51 Impact absorbing portion 52 Energy absorbing plate 52a Groove 53 Guide member 53a Notch 54 Impact absorbing member 54a Protruding shaft 54b Load bearing surface 55 Rotation shaft 60 Plate-shaped member

Claims (12)

A vehicle seat having a seat cushion,
The seat cushion is
a seat cushion frame including a pair of side frames spaced apart in a width direction of the vehicle seat;
A seat cushion pad placed on the seat cushion frame;
an impact absorbing member provided below the seat cushion pad,
The impact absorbing member is disposed between the pair of side frames in a width direction of the vehicle seat,
The impact absorbing member is provided with a cavity,
The shock absorbing member is supported from below by a support member ,
The seat cushion pad is covered with a skin material,
2. A vehicle seat according to claim 1, wherein the hollow portion of the impact absorbing member is disposed at a position avoiding a hanging portion of the cover material . A vehicle seat having a seat cushion,
The seat cushion is
a seat cushion frame including a pair of side frames spaced apart in a width direction of the vehicle seat;
A seat cushion pad placed on the seat cushion frame;
An impact absorbing member provided below the seat cushion pad;
A sensor member,
The impact absorbing member is disposed between the pair of side frames in a width direction of the vehicle seat,
The impact absorbing member is provided with a cavity,
The shock absorbing member is supported from below by a support member ,
2. A vehicle seat according to claim 1, wherein the hollow portion of the impact absorbing member is disposed at a position avoiding the sensor member . 3. The vehicle seat according to claim 1, wherein a part of a lower surface of the impact absorbing member is housed in a recess of the support member. the shock absorbing member is disposed between a forward bent portion that is bent upward to form a front end of the recess of the support member, and a rear bent portion that is bent upward or downward to form a rear end of the recess of the support member,
4. The vehicle seat according to claim 3 , wherein the lower surface of the impact absorbing member is disposed at a position avoiding the forward bent portion and the rearward bent portion of the support member. 5. The vehicle seat according to claim 1, wherein a part of an upper surface of the impact absorbing member is housed in a pad recess of the seat cushion pad. 6. The vehicle seat according to claim 1, wherein the impact absorbing member is disposed rearward of a sinking suppression member extending in a width direction of the vehicle seat. 7. The vehicle seat according to claim 1, wherein a plate-shaped member is provided at a position facing an upper surface of the impact absorbing member. 8. The vehicle seat according to claim 1, wherein no metal member is disposed between an upper surface of the impact absorbing member and the seat cushion pad. The hollow portion of the impact absorbing member is formed as a recess,
9. The vehicle seat according to claim 1, wherein the recess is provided so as to extend in a vertical direction. The hollow portion of the impact absorbing member is formed as a recess,
10. The vehicle seat according to claim 1, wherein the recess has an opening on a lower surface of the impact absorbing member. The hollow portion of the impact absorbing member is formed as a recess,
A part of an upper surface of the impact absorbing member is housed in a pad recess of the seat cushion pad,
The vehicle seat according to any one of claims 1 to 10 , characterized in that at least a portion of the hollow portion of the impact absorbing member is positioned at the same height as the pad recess in the vertical direction of the vehicle seat. The seat cushion frame is made of a resin material.
12. The vehicle seat according to claim 1, wherein the impact absorbing member is surrounded by the seat cushion frame in the front-rear direction of the vehicle seat and in the width direction of the vehicle seat.

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