Vehicle seat

Abstract

To provide a vehicle seat in which a skin thereof is hardly stretched.SOLUTION: A vehicle seat includes a frame F, a pad 10, a skin 20, and an airbag device 4. The pad 10 includes a support part 2a that supports a seated person and a bank part 2b that supports the seated person from the side. The skin 20 has a first side surface part 22 covering a surface on the seated person side of the bank part 2b, a second side surface part 23 covering a surface on the outside of the bank part 2b, and a rupture expected part 24 to be ruptured when the airbag is deployed. An adhesive region 27 bonded to the pad 10 is formed on an opposing surface of the first side surface part 22 opposed to the pad 10, and an outer end part 27a of the adhesive region 27 is provided on an inner side of the rupture expected part 24. The skin has a laminated structure having a surface layer material and a cushion material having the adhesive region 27, and the density of the cushion material in the adhesive region 27 is higher than the density of the cushion material in a part other than the adhesive region 27.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with an airbag device. [Background technology]

[0002] In recent years, vehicle seats have been provided with side airbags to protect occupants against side impacts by cushioning and distributing impact loads.

[0003] The side airbag efficiently transmits the inflation energy of the airbag to the tear line of the seam of the skin, causing the tear line to rupture in a short period of time. For example, Patent Document 1 discloses a vehicle seat in which a side airbag device is provided with a breakable portion with reduced strength in a padding material, and the breakable portion causes the airbag to inflate quickly. For example, in the vehicle seat of Patent Document 2, cotton is stuffed into the skin and the entire cotton is integrated with a hot melt adhesive to form a pad. Also, a sheet made of polyester fiber cotton is fixed to the back surface of the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-24793 [Patent Document 2] Japanese Patent Application Publication No. 7-124967 Summary of the Invention [Problem to be solved by the invention]

[0005] When an airbag device such as that described in Patent Document 1 is mounted on a vehicle seat in which a cover is adhered to a pad such as that described in Patent Document 2, it is expected that the entire surface of the first side portion covering the surface of the pad's bank portion facing the occupant will be adhered to the pad. However, the seat made of polyester fiber cotton as described in Patent Document 2 is a soft material, and therefore the surface layer is easily stretched. Therefore, there is a demand for a technology that makes the surface layer less likely to stretch in vehicle seats equipped with airbag devices.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat having a cover that is less likely to stretch. [Means for solving the problem]

[0007] The above problem is solved by a vehicle seat of the present invention, which provides a vehicle seat including a frame, a pad disposed on the frame, a skin covering the pad, and an airbag device attached to the frame and having an airbag and an inflator, wherein the pad has a support portion supporting a seated occupant, and a bank portion disposed on the outer side of the support portion in a seat width direction, bulging out from the support portion towards the seated occupant and supporting the seated occupant from the side, and the skin has a first side portion covering a surface of the bank portion facing the seated occupant, a second side portion covering an outer surface of the bank portion in the seat width direction, an outer end portion in the seat width direction of the first side portion, and an inner end portion in the seat width direction of the second side portion. and a breakable portion that is broken when the airbag is deployed, an adhesive region that is adhered to the pad is formed on an opposing surface of the first side portion that faces the pad, and an outer end portion in the seat width direction of the adhesive region of the first side portion is arranged to face the apex of the bank portion or the surface of the bank portion facing the occupant, and is located more inward in the seat width direction than the breakable portion, the skin has a laminated structure having a surface layer and a cushioning material that is laminated on the back side of the surface layer and has the adhesive region, and the density of the cushioning material in the adhesive region is higher than the density of the cushioning material in the portion other than the adhesive region. With the above-mentioned configuration, the density of the cushioning material in the adhesive region is high, so that the skin is less likely to stretch, and therefore, for example, when the airbag is deployed, the adhesive state of the skin can be maintained and the skin can be easily broken.

[0008] In this case, the intended rupture portion is positioned outside the apex of the bank portion in the seat width direction, and the outer end portion of the adhesive area in the seat width direction is positioned so as to face the surface of the bank portion facing the occupant. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0009] In this case, the outer end portion in the seat width direction of the adhesive region may be disposed more inward in the seat width direction than a portion of the frame to which the airbag device is attached. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0010] In this case, the airbag device has a mounting member for mounting the inflator to the frame, the mounting member protruding from the frame toward the inside in the seat width direction, and the outer end of the adhesive area in the seat width direction is positioned more inward in the seat width direction than the protruding end of the mounting member. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0011] In this case, a bent portion that bends inward in the seat width direction is formed at the end of the frame on the occupant's side, and the outer end of the adhesive area in the seat width direction is positioned more inward in the seat width direction than the tip of the bent portion. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0012] In this case, the airbag is positioned on the outer side of the frame in the seat width direction, and the outer end portion of the adhesive area in the seat width direction is positioned more inward in the seat width direction than the central portion of the airbag in the stored state in the seat width direction. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0013] In this case, the inflator is preferably disposed on the outer side of the frame in the seat width direction, and the outer end of the adhesive region is preferably disposed on the inner side in the seat width direction than a central portion of the inflator in the seat width direction. With the above-described configuration, the adhesive region of the first side surface portion is provided at a position facing the slope of the bank portion, so that the adhesive state of the cover can be further maintained when the airbag is deployed.

[0014] In this case, it is preferable that no webbing for guiding the deployment of the airbag is provided between the first side portion and the second side portion and the pad in the thickness direction of the skin. With the above-mentioned configuration, the seat body can have a simple structure by directly bonding the cover to the surface of the pad without using a webbing.

[0015] In this case, the frame has a first side frame in which the airbag device is arranged and a second side frame in which the airbag device is not arranged, and the density of the cushioning material provided on the first side frame side is higher than the density of the cushioning material provided on the second side frame side. With the above-described configuration, the density of the cushioning material in the vicinity of the airbag device can be increased, making it possible to make the skin less likely to stretch. Effect of the Invention

[0016] According to the present invention, the epidermis can be made less likely to stretch. Furthermore, according to the present invention, the adhesive state of the skin can be further maintained when the airbag is deployed. Furthermore, according to the present invention, the seat body can have a simple structure. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3]FIG. 13 is a diagram showing the deployment of an airbag, showing a state in which the airbag has just started to inflate; [Figure 4] FIG. 4 is a diagram illustrating the deployment of an airbag, showing a state before a breakable portion breaks. [Diagram 5] FIG. 13 is a diagram illustrating the deployment of the airbag, showing the state after the breakable portion has broken. [Figure 6] 3 is an enlarged view of a main portion of FIG. 2, showing a cross-sectional view of the periphery of a portion to be broken. [Figure 7] FIG. 10 is a view showing a vehicle seat according to a second embodiment, illustrating a positional relationship between the frame and the airbag device and an outer end of the adhesive region. [Figure 8] FIG. 10 is a view illustrating a vehicle seat according to a third embodiment, illustrating positions of adhesive regions. [Figure 9] FIG. 13 is a view illustrating a vehicle seat according to a fourth embodiment, illustrating positions of adhesive regions. [Figure 10] FIG. 13 is a perspective view of a seat frame that serves as a framework of a vehicle seat according to a fifth embodiment. [Figure 11] FIG. 4 is a side view of the seat frame, illustrating a state before the upper frame is folded in half. [Figure 12] 11 is a side view of the seat frame, showing a state after the upper frame has been folded in half. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, the "front-rear direction" refers to the front-rear direction of the vehicle seat, which coincides with the direction of travel when the vehicle is traveling. The "seat width direction" refers to the width direction of the vehicle seat, which coincides with the left-right direction as seen by an occupant seated in the vehicle seat. The "up-down direction" refers to the up-down direction of the vehicle seat, which coincides with the vertical direction when the vehicle is traveling on a horizontal plane.

[0019] <Overall sheet configuration> The vehicle seat S of this embodiment is a seat that is placed on a vehicle body floor and in which a vehicle occupant sits, as shown in Fig. 1. In this embodiment, the vehicle seat S is used as a front seat that corresponds to the front seat of the vehicle. However, the present invention is not limited to this, and the vehicle seat S may be a rear seat of the vehicle, and may also be used as a second-row middle seat or a third-row rear seat in a vehicle that has three rows of seats in the front-rear direction.

[0020] As shown in Figs. 1 and 2, the vehicle seat S is mainly composed of a seat body having a seat cushion 1, a seat back 2, and a headrest 3, and an airbag device 4. In this embodiment, the airbag device 4 is provided at the right end of the seat back 2. However, the location of the airbag device 4 is not limited to this, and it may be the left end or both ends of the seat back 2. Moreover, the airbag device 4 may be provided in the seat cushion 1. The vehicle seat S is provided therein with a seat frame F. The seat cushion 1 and the seat back 2 each have a pad 10 arranged on the seat frame F and a cover 20 that covers the pad 10.

[0021] The skin 20 is adhered to the surface of the pad 10. The skin 20 may be fixed to the pad 10 by an engaging member provided on the skin 20 engaging with a clip provided on the pad 10 and hanging it. Although a clip has been exemplified as the engaged member, the present invention is not limited thereto, and the skin 20 may be engaged with the pad 10 by a wire member.

[0022] As shown in FIG. 1, the seat cushion 1 is a seating portion that supports a seated person from below, and is configured by placing a pad 10 on a cushion frame (not shown) that forms the skeleton of the seat cushion 1, and covering it with a skin 20. The seat back 2 is a backrest portion that supports the back of a seated occupant from behind, and is constructed by placing a pad 10 on a seat frame F (back frame) shown in Figure 2, which forms the skeleton of the seat back 2, and covering it with a skin 20. The seat back 2 has a support portion 2a that supports the seated occupant from behind, and a bank portion 2b that supports the seated occupant from the sides. The headrest 3 supports the head of a seated occupant from behind, and is configured by placing a padding material on a pillar (not shown) that serves as a core material, and covering it with a skin material.

[0023] A pair of seat frames F are provided in the left-right direction of the seat back 2. The seat frame F has a first side frame (right side frame Fa) in which the airbag device 4 is arranged, and a second side frame (left side frame Fb) in which the airbag device 4 is not arranged. A bent portion Fc that is bent inward in the seat width direction is formed at the end (front end) of the seat frame F on the seat occupant side. Specifically, the bent portion Fc is formed by bending the front end of the right side frame Fa to the left.

[0024] The airbag device 4, as shown in FIGS. 1 and 2, has a known configuration, is attached to a seat frame F, and is disposed inside the bank portion 2b of the seat back 2 and on the inner side of the skin 20. The airbag device 4 includes an airbag 4a, an inflator 4b that supplies gas to the airbag 4a, a cover 4c that covers the airbag 4a and the inflator 4b, and a mounting member 4d that mounts the airbag 4a, the inflator 4b, and the cover 4c to the seat frame F.

[0025] 2, the airbag device 4 is attached to the right side of the seat frame F with a mounting member 4d such as a bolt, and is housed inside the pad 10. Specifically, the airbag 4a and the inflator 4b are disposed on the outer side of the seat frame F in the seat width direction, and are fixed to the seat frame F by the mounting member 4d. When gas is ejected from the gas ejection portion by the inflator 4b and the airbag 4a is inflated outside the cover 4c, the pad 10 is broken and the skin 20 is cut open, causing the airbag 4a to deploy outward.

[0026] <Pad> The pad 10 has a cushion portion formed of a foam, and the cushion portion is covered with a skin 20. As the foam, polypropylene bead foam, polyethylene bead foam, polypropylene foam, polyethylene foam, acrylonitrile-styrene foam, ethylene vinyl acetate copolymer resin, urethane foam material, or a combination of these may be used. In this embodiment, the pad 10 is a urethane pad molded by foam molding using a urethane foaming agent.

[0027] A slit 10b is formed in the right end of the pad 10, which is broken when the airbag 4a is inflated from the airbag device 4. The slit 10b is formed on the left side of the front end of the airbag device 4. A hanging groove in which a plurality of clips are provided at predetermined intervals may be formed in the pad 10. The clip is fixed to the pad 10 by being partially embedded in the bottom of the hanging groove.

[0028] A recess 10c is formed on the surface of the bank portion 2b of the pad 10 facing the seated person (the inner slope of the bank portion 2b). The recess 10c is a portion where the inner slope of the bank portion 2b is recessed by about 1 to 4 mm, and is an area to which an adhesive is applied. Note that the adhesive may be applied to areas of the pad 10 other than the recess 10c. The recess 10c may be formed on the entire inner slope of the bank portion 2b, or may be formed only on a part of the inner slope. For example, the recess 10c may be provided only in the vicinity of the airbag device 4 of the bank portion 2b. The recess 10c may also be formed at the apex of the bank portion 2b.

[0029] <Eidermis> The cover 20 is made of fabric, film, cloth, leather, sheet, or the like, and is attached so as to cover the pad 10 while being stretched with a predetermined tension. 1 and 2, the skin 20 covering the seat back 2 has a central portion 21 covering the front side of the support portion 2a, a first side portion 22 covering the inner surface (the side of the seated person) of the bank portion 2b in the seat width direction, and a second side portion 23 covering the outer surface of the bank portion 2b in the seat width direction. The central portion 21 and the first side portion 22 are formed continuously at the boundary between the support portion 2a and the bank portion 2b.

[0030] As shown in FIG. 2, the central portion 21 is a portion that covers the surface of the support portion 2a facing the seated occupant, and is directly bonded to the support portion 2a with an adhesive. The first side surface portion 22 is a portion that covers the surface of the bank portion 2b facing the seated occupant, and is directly bonded to the bank portion 2b with an adhesive in a bonding region 27 described below. The second side surface portion 23 is a portion that covers the outer surface of the bank portion 2b, and is directly bonded to the bank portion 2b with an adhesive. Note that no adhesive is provided on the portion of the second side surface portion 23 that faces the slit 10b.

[0031] In this way, the skin 20 is directly bonded to the surface of the pad 10 without using a known guide member (webbing) for guiding the deployment of the airbag 4a. Specifically, no webbing for guiding the deployment of the airbag 4a is provided between the pad 10 and the first side surface portion 22 and the second side surface portion 23 in the thickness direction of the skin 20. By directly bonding the skin 20 to the surface of the pad 10 without using webbing, the seat body can have a simple structure.

[0032] The first side surface portion 22 is joined to an outer end portion 21a in the seat width direction of the central portion 21. The second side surface portion 23 is joined to an outer end portion 22a in the seat width direction of the first side surface portion 22. In other words, the skin 20 is formed by joining the outer end portion 22a in the seat width direction of the first side surface portion 22 and the inner end portion 23a in the seat width direction of the second side surface portion 23.

[0033] 1 and 2, the cover 20 has a tear line 24 that is torn when the airbag 4a is deployed. More specifically, the outer end 22a of the first side surface portion 22 and the inner end 23a of the second side surface portion 23 are connected by sewing near the apex of the bank portion 2b. The tear line 24 that is torn when the airbag 4a is deployed is formed in the portion connected by sewing. The tear line 24 is located outboard of the apex of the bank portion 2b in the seat width direction. The rear end 23b of the second side surface portion 23 is connected to a skin rear portion 25 that covers the rear side of the pad 10 via a wire fastener 26.

[0034] The first side surface portion 22 is adhered to the surface of the pad 10 by an adhesive applied to the recess 10c. That is, an adhesive region 27 that is adhered to the pad 10 is formed on the back surface of the first side surface portion 22 (the surface facing the pad 10). Note that an adhesive may be applied to the adhesive region 27 of the first side surface portion 22, and the first side surface portion 22 may be adhered to the surface of the pad 10. Also, the first side surface portion 22 may be adhered to the pad 10 by a method other than applying an adhesive to the adhesive region 27. In other words, it is sufficient that at least a portion of the first side surface portion 22 is attached to the surface of the pad 10.

[0035] 2, the bonding region 27 of the first side surface portion 22 has a predetermined area and is provided so as to face the surface (inner slope) of the bank portion 2b facing the seat occupant. In other words, a part of the first side surface portion 22 is bonded to the pad 10 at a position corresponding to the inner slope of the bank portion 2b. At this time, an outer end 27a in the seat width direction of the adhesive region 27 of the first side surface portion 22 is disposed so as to face the surface of the bank portion 2b on the seat occupant side. The outer end 27a is provided on the inside in the seat width direction of the intended rupture portion 24. Since the outer end 27a is provided spaced inward from the intended rupture portion 24, the skin 20 can be maintained in a state of being adhered to the pad 10 when the airbag 4a is deployed.

[0036] In this way, the first side surface portion 22 is less likely to peel off early from the pad 10, which makes it possible to suppress the stretching of the skin 20. In addition, since the stretching of the skin 20 can be suppressed, the time required to rupture the planned rupture portion 24 can be shortened, making it easier for the skin 20 to rupture when the airbag is deployed. The first side surface portion 22 is bonded to the surface of the bank portion 2b facing the seat occupant in the bonding region 27, and the second side surface portion 23 is bonded to the outer surface of the bank portion 2b in the seat width direction. Since the outer end portion 27a is provided on the inner side in the seat width direction than the breakable portion 24, the airbag 4a can be smoothly deployed without using a webbing.

[0037] The adhesive region 27 of the first side surface portion 22 may be disposed so as to face the apex of the bank portion 2b. In this case, the portion to be broken 24 is disposed on the outer side in the sheet width direction than the apex of the bank portion 2b. Even in this case, since the adhesive region 27 of the first side surface portion 22 is provided on the inside in the sheet width direction relative to the intended rupture portion 24, it is possible to suppress stretching of the skin 20. In addition, it is possible to make the first side surface portion 22 less likely to peel off from the pad 10 early.

[0038] The manner in which the rupture portion 24 ruptures when the airbag 4a deploys will be described with reference to Figs. Fig. 3 shows the airbag 4a beginning to inflate, Fig. 4 shows the airbag 4a inflating and rupturing the breakable portion 24, and Fig. 5 shows the airbag 4a deploying outward after the breakable portion 24 has ruptured.

[0039] 3, when the airbag 4a starts to deploy, the airbag 4a inflates outward in the seat width direction, and the pad 10 is broken at the slits 10b and deformed by the inflation of the airbag 4a. At this time, the suture of the portion to be broken 24 remains connected, and the epidermis 20 is not broken. In addition, the outer end 27a of the adhesive region 27 of the first side surface portion 22 remains adhered to the pad 10.

[0040] 4, when the airbag 4a is further deployed, the airbag 4a inflates forward, and the front end of the airbag 4a ruptures the intended rupture portion 24. The expansion energy of the airbag 4a is concentrated on the stitching of the intended rupture portion 24, and the stitching is cut. At this time, the outer end 27a of the adhesive region 27 of the first side surface portion 22 remains adhered to the pad 10. Therefore, it is possible to suppress the elongation of the skin 20 when the portion to be broken 24 is broken. In addition, since the elongation of the skin 20 can be suppressed, the time required for breaking the portion to be broken 24 can be shortened.

[0041] As shown in FIG. 5, the airbag 4a, whose breakable portion 24 has broken, is deployed forward. At this time, the outer end 22a of the first side surface portion 22 in the sheet width direction and the inner end 23a of the second side surface portion 23 in the sheet width direction are separated from each other. Also, the outer end 27a of the adhesive region 27 of the first side surface portion 22 is peeled off from the pad 10.

[0042] As shown in Figs. 3 to 5, the outer end 27a is provided spaced inward from the portion to be broken 24, so that the outer end 27a of the adhesive region 27 peels off after the portion to be broken 24 is broken. Therefore, when the portion to be broken 24 breaks, the outer end 27a of the adhesive region 27 remains attached to the pad 10, so that the skin 20 is easily broken. Furthermore, since there is a non-adhesive region between the portion to be broken 24 and the adhesive region 27 where no adhesive is applied, the amount of adhesive used can be reduced.

[0043] Next, the laminated structure of the surface layer 20 will be described with reference to Fig. 6. The surface layer 20 is a three-layered sheet-like member having a surface layer material 20a, a cushion material 20b laminated on the back side of the surface layer material 20a, and a base fabric 20c laminated on the back side of the cushion material 20b. The surface layer material 20a, the cushion material 20b, and the base fabric 20c are integrated together by bonding, fusion, or sewing. The first side surface portion 22 and the second side surface portion 23 are joined at the breakable portion 24 with the surface layer 20a, the cushioning material 20b, and the base fabric 20c laminated together, and are folded at the joint. The outer end portion 22a and the inner end portion 23a are disposed in a recess formed at the apex of the pad 10.

[0044] The surface material 20a is made of a material such as cloth or leather, and is provided to be located on the front side (the exposed side facing the seat occupant) in the thickness direction of the skin 20, and is a covering material that constitutes the outer appearance of the vehicle seat S. The cushion material 20b is made of a material such as urethane, and is provided so as to be located on the back side of the surface layer material 20a in the thickness direction of the skin 20. The base fabric 20c is, for example, a nonwoven fabric, and is provided so as to be located on the back side of the cushion material 20b in the thickness direction of the skin 20.

[0045] The cushion material 20b and the base fabric 20c are provided so as to be located on the side facing the pad 10 in the thickness direction of the skin 20. An adhesive region 27 is formed in the cushion material 20b and the base fabric 20c. In other words, the skin 20 is adhered to the pad 10 via the adhesive region 27 in a state in which the cushion material 20b and the base fabric 20c face the surface of the pad 10 so that the surface layer material 20a is exposed.

[0046] The density of the cushion material 20b in the adhesive region 27 is higher than the density of the cushion material 20b other than the adhesive region 27. For example, the density of the cushion material 20b in the first side surface portion 22 is higher than the density of the cushion material 20b in the second side surface portion 23. In this way, by increasing the density of the cushioning material 20b in the adhesive region 27, it is possible to make the skin 20 less likely to stretch. Therefore, it is possible to suppress the stretching of the skin 20 when the portion to be broken 24 breaks, and the skin 20 becomes more likely to break.

[0047] The density of the cushioning material 20b may be increased not only in the entire first side surface portion 22 but also in the portion facing the adhesive region 27. In this case, the density of the cushioning material 20b may be increased over the entire surface of the adhesive region 27, or may be increased over a portion of the surface of the adhesive region 27.

[0048] In addition, the cushion material 20b provided on the right side frame Fa side may be configured to have a higher density than the cushion material 20b provided on the left side frame Fb side. In this manner, by increasing the density of the cushioning material 20b in the vicinity of the airbag device 4, it is possible to make the skin 20 less likely to stretch. Therefore, it is possible to suppress the stretching of the skin 20 when the breakable portion 24 breaks, and the skin 20 becomes more likely to break.

[0049] <Manufacturing method> A method for manufacturing the vehicle seat S will be described. First, prepare a seat frame F (back frame) of the seat back 2. On the right side surface of the seat frame F, an airbag device 4 having an airbag 4a and an inflator 4b is attached with fasteners 4e such as bolts. Then, the pad 10 is placed on the seat frame F to which the airbag device 4 is attached. At this time, the airbag device 4 is housed inside the pad 10.

[0050] Next, a laminated skin 20 is prepared, which includes a surface layer 20a and a cushion material 20b laminated on the back side of the surface layer 20a and having an adhesive region 27. An adhesive is applied to the recess 10c of the pad 10, the pad 10 is covered with the skin 20, and the skin 20 is adhered to the pad 10. At this time, the outer end 27a in the seat width direction of the adhesive region 27 of the first side surface portion 22 is arranged to face the apex of the bank portion 2b or the face of the bank portion 2b on the seat occupant side. Also, the skin 20 is adhered to the pad 10 so that the outer end 27a of the adhesive region 27 is located inside the intended rupture portion 24 in the seat width direction.

[0051] The manufacturing method of the vehicle seat S described above is as follows. A method for manufacturing a vehicle seat, comprising: Prepare the frame, an airbag device having an airbag and an inflator attached to the frame; A pad is placed on the frame; covering said pad with said skin and adhering said skin to said pad; the skin has a first side portion covering a surface of the bank portion facing the seat occupant, a second side portion covering an outer surface of the bank portion in a seat width direction, and a break portion configured by joining an outer end portion of the first side portion in the seat width direction and an inner end portion of the second side portion in the seat width direction, the break portion being broken when the airbag is deployed, an adhesive region that is adhered to the pad is formed on a surface of the first side surface portion that faces the pad; the skin has a laminated structure including a surface layer material and a cushion material laminated on the back side of the surface layer material and having the adhesive region, the density of the cushion material in the adhesive region being higher than the density of the cushion material in a portion other than the adhesive region, A manufacturing method for a vehicle seat, characterized in that when covering the pad with the skin, the outer end portion in the seat width direction of the adhesive area of ​​the first side portion is positioned so as to face the apex of the bank portion or the surface of the bank portion facing the occupant, and is located inward in the seat width direction than the intended break portion.

[0052] Second Embodiment Next, a vehicle seat S2 according to a second embodiment will be described with reference to Fig. 7. Note that descriptions overlapping with those of the vehicle seat S described above will be omitted. In the vehicle seat S2, the recess 10c is not provided, and a part of the first side surface portion 122 is bonded to the inner slope of the bank portion 102b of the pad 110. The breakable portion 124 is located outboard of the apex of the bank portion 102b in the seat width direction.

[0053] An outer end 127a in the seat width direction of the adhesive region 127 of the first side surface portion 122 is disposed so as to face the surface of the bank portion 102b on the seat occupant side. The outer end 127a is provided on the inside in the seat width direction of the intended rupture portion 124. Since the outer end 127a is provided spaced inward from the intended rupture portion 124, the skin 120 can be maintained in a state of being adhered to the pad 110 when the airbag 104a is deployed.

[0054] The position of the outer end 127a in the sheet width direction of the adhesive region 127 of the first side surface portion 122 will be described in more detail. An outer end 127a of the adhesive region 127 is disposed on the inner side in the seat width direction than a portion (L1) of the seat frame F2 to which the airbag device 104 is attached. Further, the outer end 127a of the adhesive region 127 is disposed on the inner side in the seat width direction than the protruding end 104d1 (L2) of the attachment member 104d.

[0055] An outer end 127a of the adhesive region 127 is disposed on the inner side in the sheet width direction than a tip end F2c1 (L3) of the bent portion F2c. Further, the outer end 127a of the adhesive region 127 is disposed on the inner side in the seat width direction than the center portion (L4) in the seat width direction of the airbag 104a in the stored state. An outer end 127a of the adhesive region 127 is disposed on the inner side in the seat width direction from a center portion (L5) of the inflator 104b in the seat width direction.

[0056] In this way, the outer end 127a in the seat width direction of the adhesion region 127 of the first side surface portion 122 is disposed so as to face the inner slope of the bank portion 102b. The outer end 127a is provided on the inner side in the seat width direction of the bent portion F2c of the seat frame F2 and each member of the airbag device 104. Since the force exerted when the airbag 104a is inflated is less likely to be applied to the outer end 127a, the skin 20 can be maintained in a state of being adhered to the pad 10 when the airbag 4a is deployed. Therefore, the adhesive state of the cover 120 can be maintained even more effectively when the airbag 104a is deployed.

[0057] <Third embodiment> Next, a vehicle seat S3 according to a third embodiment will be described with reference to Fig. 8. Note that descriptions overlapping with the above-described vehicle seats S and S2 will be omitted. In the vehicle seat S3, an air cell 231 is provided inside the pad 210 on the seat occupant side of the bank portion 202b. The air cell 231 is composed of two air bags 231a and 231b, one large and one small, and is capable of expanding and contracting. The air cell 231 is inflated to press against a part of the body of the seat occupant, thereby massaging the waist, back, etc. of the seat occupant to relax or refresh the seat occupant. The air cell 231 is disposed in an air cell housing portion 230 formed in the pad 210 of the seat back 202 from the front side (seating surface side) toward the back side as shown in FIG.

[0058] 8, a heater device 233 may be provided on the front side of the air cell 231. A vibration device 234 may be provided instead of the heater device 233. The surface of the heater device 233 or the vibration device 234 facing the seated occupant is in direct contact with the back surface of the first side portion 222 (skin 220), and therefore heat or vibration is easily transmitted to the seated occupant. It is not necessary to provide the heater device 233 and the vibration device 234 on the surface of the air cell 231 facing the seated occupant. In this case, the surface of the air cell 231 facing the seated occupant comes into direct contact with the first side surface portion 222.

[0059] As shown in FIG. 8, the adhesion region 227 of the first side surface portion 222 that is adhered to the pad 210 is provided at a position that does not overlap with the air cell 231 in the thickness direction of the first side surface portion 222. More specifically, recesses 210c are formed on the inner slope of pad 210 at positions avoiding air cells 231. Pad 210 and first side surface portion 222 are then bonded together by adhesive applied to recesses 210c.

[0060] In this way, since the adhesive region 227 is provided at a position avoiding the air cells 231, it is possible to reduce the load or pressure applied to the adhesive region 227. Furthermore, since the outer end 227a of the adhesive region 227 of the first side surface portion 222 is provided on the inside in the sheet width direction relative to the intended rupture portion 224, it is possible to make it difficult for the first side surface portion 222 to peel off from the pad 210 early. Therefore, the adhesive state of the cover 220 can be maintained even more effectively when the airbag 204a is deployed.

[0061] <Fourth embodiment> Next, a vehicle seat S4 according to a fourth embodiment will be described with reference to Fig. 9. Note that descriptions overlapping with the vehicle seats S, S2, and S3 described above will be omitted. In the vehicle seat S4, an air cell 331 is provided inside the pad 310 on the seat occupant side of the bank portion 302b. 9, a heater device 333 may be provided on the front side of the air cell 331. Instead of the heater device 333, a vibration device 334 may be provided.

[0062] Air cell 331 is disposed in air cell housing portion 330 formed in pad 310 of seat back 302 from the front side (seating surface side) toward the back side as shown in FIG. A lid 311 made of urethane foam or the like is provided on the opening of air cell housing 330 on the seat occupant side. Lid 311 is configured as a separate member from pad 310, and is provided so as to cover the opening of air cell housing 330 on the seat occupant side.

[0063] The recess 310c of the pad 310 is formed so as to straddle the surface of the pad 310 between the portion to be broken 324 and the lid portion 311, and the outer surface of the lid portion 311 in the sheet width direction. 9, the adhesion region 327 of the first side surface portion 322 adhered to the pad 310 is provided at a position that partially overlaps with the air cell 331 in the thickness direction of the first side surface portion 322. Then, the pad 310 and the first side surface portion 322 are adhered to each other by the adhesive applied to the recess 310c.

[0064] In this way, since the adhesive region 327 is provided so as to partially overlap with the air cell 331, the pad 310 can press a part of the adhesive region 327 when the air cell 331 expands. This improves the adhesive strength between the pad 310 and the first side surface portion 322. In addition, since the outer end portion 327a of the adhesive region 327 of the first side surface portion 322 is provided on the inside in the sheet width direction relative to the planned rupture portion 324, it is possible to make it difficult for the first side surface portion 322 to peel off from the pad 310 early. Therefore, the adhesive state of the cover 320 can be maintained even more effectively when the airbag 304a is deployed.

[0065] <Fifth embodiment> Next, a vehicle seat S5 according to a fourth embodiment will be described with reference to Figures 10 to 12. Note that descriptions overlapping with the vehicle seats S, S2, S3, and S4 described above will be omitted.

[0066] The vehicle seat S5 is provided with a seat frame F5 therein, as shown in Fig. 10. An armrest frame A forming the framework of an armrest that supports the arms of a seated occupant from below is attached to the seat frame F5. The seat frame F5 has a right side frame F5a in which the airbag device 404 is disposed, a left side frame F5b in which the airbag device 404 is not disposed, and an upper frame F5c that connects the upper parts of the right side frame F5a and the left side frame F5b.

[0067] The upper frame F5c has an inverted U-shape and connects the upper end of the right side frame F5a and the upper end of the left side frame F5b. A blower device 405 that blows air toward a seated occupant is provided on the front surface of the upper frame F5c. Further, a pressure-receiving member 406 for receiving the load from a seated occupant is provided in the center of the seat frame F5. Furthermore, the seat frame F5 is provided with a center bending device 407 that bends the upper frame F5c relative to the right side frame F5a and the left side frame F5b.

[0068] The blower device 405 is attached to the front surface of the upper frame F5c. The blower device 405 has a blower body 405a that supplies air, a duct 405b through which the air passes, and an outlet 405c through which the air is blown out toward the back of a seated occupant. The blower body 405a is disposed at the center of the upper frame F5c. The duct 405b extends from the blower body 405a to the left in the seat width direction, bends, and extends to the front side of the seat. The air outlet 405c is formed at the extending end of the duct 405b.

[0069] The pressure-receiving member 406 is a plate-shaped elastic support member that supports the back of the seated occupant from behind, and bends in the front-rear direction of the seat in response to (following) the movement of the seated occupant. The pressure-receiving member 406 is held by left and right elastic wires 406a that extend in the up-down direction. The pressure-receiving member 406 has a first support portion 406b supported by a lower portion of the elastic wire 406a and supporting the waist of the seated occupant from behind, and a second support portion 406c supported by an upper portion of the elastic wire 406a and supporting the shoulders of the seated occupant from behind. A plurality of air cells 431 are fixed to the first support portion 406b and the second support portion 406c.

[0070] When the air cells 431 expand, they are restricted by the pressure-receiving members 406 and expand forward. Therefore, the air cells 431 expand appropriately so as to push the waist or shoulders of the seated occupant forward.

[0071] 10, the seat folding device 407 is a device that connects the upper frame F5c to the right side frame F5a and the left side frame F5b so as to be rotatable about an axis O, and is also capable of locking the upper frame F5c. The seat folding device 407 has a drive source, and uses the drive force of the drive source to rotate the upper frame F5c forward relative to the right side frame F5a and the left side frame F5b, thereby bending the seat frame F5. Specifically, the seat folding device 407 switches the seat frame F5 between a normal position (FIG. 11) and a bent position (FIG. 12) in which the right side frame F5a, the left side frame F5b and the upper frame F5c are bent so as to approach each other.

[0072] In the above embodiment, a vehicle seat used in an automobile has been described as a specific example, however, without being limited thereto, the present invention can be used for various seats such as two-wheeler seats, vehicle seats for trains and buses, seats for vehicles such as airplanes and ships, as well as office chairs for work, wheelchairs, and child seats in shopping carts.

[0073] In the present embodiment, the vehicle seat according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0074] S, S2, S3, S4, S5 Vehicle Seats F, F2, F5 seat frame (frame) Fa, F5a right side frame Fb, F5b left side frame Fc, F2c bent part F2c1 tip F5c Upper Frame 1 seat cushion 2, 202, 302 seat back 2a Support part 2b, 102b, 202b, 302b Bank 3 Headrest 4, 104, 404 Airbag device 4a, 104a, 204a, 304a Airbags 4b, 104b Inflator 4c Cover 4d, 104d Mounting parts 104d1 Projecting end 4e Fixtures 10, 110, 210, 310 pads 10b Slit 10c, 210c, 310c recess 20, 120, 220, 320 epidermis 20a Surface material 20b Cushioning material 20c base fabric 21 Central part 21a End 22, 122, 222, 322 First side part 22a Outer edge 23 Second side part 23a Inner edge 23b Rear end 24, 124, 224, 324 Breaking part 25 Dorsal part of the epidermis 26 Wire fastener 27, 127, 227, 327 adhesive area 27a, 127a, 227a, 327a outer end 230, 330 Air cell housing 231, 331, 431 Air Cell 231a Air bag 231b Air bag 233, 333 Heater device 234, 334 Vibration device 311 Lid 405 Blower unit 405a Blower body 405b Duct 405c Air outlet 406 Pressure-receiving member 406a Elastic Wire 406b First support part 406c Second support part 407 Center-folding device A Armrest frame O axis

Claims

1. A vehicle seat, A frame, A pad disposed on the frame; A skin covering the pad; an airbag device attached to the frame and having an airbag and an inflator, The pad is A support part that supports a seated occupant; a bank portion disposed on an outer side of the support portion in the seat width direction, protruding from the support portion toward the seat occupant, and supporting the seat occupant from the side; The epidermis is A first side portion covering a surface of the bank portion facing the seat occupant; A second side portion covering an outer surface of the bank portion in the sheet width direction; a breakable portion configured by joining an outer end portion in the seat width direction of the first side surface portion and an inner end portion in the seat width direction of the second side surface portion, the breakable portion being broken when the airbag is deployed, an adhesive region that is adhered to the pad is formed on a surface of the first side surface portion that faces the pad; The outer end portion of the adhesive region of the first side surface portion in the sheet width direction is The seat is disposed so as to face the apex of the bank portion or the surface of the bank portion facing the seat occupant, The breakable portion is provided on the inner side in the sheet width direction. The skin has a laminated structure including a surface layer material and a cushion material laminated on the back side of the surface layer material and having the adhesive region, A vehicle seat, comprising: a cushion material having a density higher in the adhesive region than in a portion other than the adhesive region.

2. the breakable portion is disposed outward in the sheet width direction from the apex of the bank portion, The vehicle seat according to claim 1 , wherein the outer end portion in the seat width direction of the adhesive region is disposed so as to face a surface of the bank portion facing the seat occupant.

3. 2. The vehicle seat according to claim 1, wherein the outer end portion in the seat width direction of the adhesive region is disposed on the inner side in the seat width direction than a portion of the frame to which the airbag device is attached.

4. The airbag device has a mounting member that mounts the inflator to the frame, The mounting member protrudes inward from the frame in a seat width direction, 2. The vehicle seat according to claim 1, wherein the outer end portion in the seat width direction of the adhesive region is disposed inward in the seat width direction with respect to the protruding end portion of the mounting member.

5. A bent portion is formed at an end of the frame on the seat occupant side, the bent portion being bent inward in the seat width direction, The vehicle seat according to claim 1 , wherein the outer end portion in the seat width direction of the adhesive region is located more inward in the seat width direction than the tip end portion of the bent portion.

6. The airbag is disposed on an outer side of the frame in a seat width direction, 2. The vehicle seat according to claim 1, wherein the outer end portion in the seat width direction of the adhesive region is positioned more inward in the seat width direction than a central portion in the seat width direction of the airbag in a stored state.

7. The inflator is disposed on an outer side of the frame in a seat width direction, 2. The vehicle seat according to claim 1, wherein the outer end of the adhesive region is disposed inward in the seat width direction relative to a center portion of the inflator in the seat width direction.

8. 2. The vehicle seat according to claim 1, wherein no webbing for guiding the deployment of the airbag is provided between the first side portion and the second side portion and the pad in the thickness direction of the skin.

9. the frame includes a first side frame in which the airbag device is disposed and a second side frame in which the airbag device is not disposed, 2. The vehicle seat according to claim 1, wherein a density of the cushion material provided on the first side frame side is higher than a density of the cushion material provided on the second side frame side.

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