Side airbag device and vehicle seat provided with same

Abstract

The invention relates to a side airbag device and a vehicle seat provided with the same. The present invention provides a side airbag device capable of quickly and appropriately restraining an occupant at an initial stage of airbag deployment, and a vehicle seat including the side airbag device. The airbag is provided with: a first chamber that deploys toward the front of the side support part; and a second chamber that accommodates the inflator and that deploys prior to the first chamber on the inside of the first chamber in the vehicle width direction. An internal vent hole for causing the expansion gas to flow from the second chamber to the first chamber is provided at a partition between the first chamber and the second chamber. The second chamber includes an upper region and a lower region, and an intermediate region located between the upper region and the lower region, and at least one of the upper region and the lower region protrudes further toward the front of the vehicle than the intermediate region.

Description

[0001] This application is a divisional application based on the invention with application number 201910023501.4, application date January 10, 2019, applicant being Autoliv Development Co., Ltd., and invention name being “Side airbag device and vehicle seat equipped with the side airbag device”. Technical Field

[0002] The present invention relates to a vehicle seat equipped with a side airbag device. Background Art

[0003] As is known to all, one or more airbags are provided on a vehicle to protect the occupants in the event of an accident. As safety airbags, there are various forms, such as: a so-called driver's safety airbag that expands from the vicinity of the center of the steering wheel of the vehicle to protect the driver; a curtain airbag that deploys downward from the inside of the vehicle window to protect the occupants in the event of a lateral collision or rollover or overturning of the vehicle; and a side airbag that deploys between the occupants and the side panels to protect the occupants in the event of a lateral collision of the vehicle. The present invention relates to a side airbag device and a vehicle seat having the side airbag device.

[0004] The side airbag device described in the following patent document 1 includes a main airbag and an auxiliary airbag. In addition, by expanding and deploying the auxiliary airbag before the main airbag, the occupant is restrained at an early stage. In addition to the invention described in patent document 1, a side airbag device including an auxiliary airbag in addition to the main airbag is also proposed. In such a side airbag device, the installation area is greatly limited, and therefore it is strongly required to make the device compact.

[0005] Furthermore, it is necessary to obtain appropriate passenger protection performance by increasing the deployment speed and stabilizing the deployment action and the deployed shape.

[0006] Prior Art Literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2009-023494. Summary of the invention

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a side airbag device capable of quickly and appropriately restraining an occupant, and a vehicle seat including the side airbag device.

[0010] Furthermore, another object of the present invention is to provide a side airbag device that contributes to compactness of the device and a vehicle seat including the side airbag device.

[0011] In the specification, claims and drawings, directions are defined as follows. When an occupant is seated in a normal sitting position with most of the occupant's back in contact with the seat back, the direction of the occupant's torso is "front", and the opposite direction is "rear". In addition, in a direction orthogonal to the front-rear direction, the right side of the occupant is "right", and the left side is "left". In the left-right direction, the area on the passenger side of the side frame of the seat is "inside", and the area opposite to the occupant as seen from the side frame is "outside".

[0012] To achieve the above-mentioned object, the vehicle seat of the present invention is applicable to the following vehicle seat, which includes: a seat cushion forming a seat surface, and a seat back having a side support portion protruding toward the vehicle travel direction, i.e., the front of the vehicle, at the side portion, i.e., the end portion, in the vehicle width direction while forming a backrest. The vehicle seat includes: a frame side wall portion, which is provided inside the side support portion and extends along the vehicle travel direction when a horizontal cross section is viewed from above; and a side airbag device, which includes an airbag provided inside the side support portion and restraining an occupant by inflating and deploying, and an inflator provided inside the frame side wall portion in the vehicle width direction and supplying inflation gas to the airbag.

[0013] Here, the airbag includes: a first chamber that is deployed toward the front of the side support portion, and a second chamber that accommodates the inflator and begins to deploy before the first chamber on the inner side of the first chamber in the vehicle width direction. An internal exhaust hole for allowing the inflation gas to flow from the second chamber into the first chamber is provided in a partition between the first chamber and the second chamber.

[0014] The second chamber includes an upper region, a lower region, and a middle region between the upper region and the lower region. Moreover, at least one of the upper region and the lower region protrudes further toward the front of the vehicle than the middle region.

[0015] Here, the "upper area" may be set to include, for example, a specified position between the upper arm and the head or between the chest and the head of the AM 50 doll, and may have both the pre-pushing function and the occupant protection function. Preferably, it may be set to include a specified portion for protecting the head of the AM 50 doll. In addition, for example, the "lower area" may be set to include a specified portion for protecting the waist of the AM 50 doll.

[0016] According to the present invention having the above structure, the second chamber is deployed inside the side support portion at the initial stage of operation of the airbag device, and movement of the occupant to the outside in the vehicle width direction can be quickly restrained.

[0017] In addition, since the side support portion is deformed to protrude toward the passenger side and presses the passenger toward the inside in the vehicle width direction, the force that pushes the passenger from the back to the front can be avoided or minimized, thereby preventing the passenger from moving in the direction of pulling out the seat belt. In other words, the harm to the passenger can be suppressed and the restraint performance can be maximized.

[0018] And it can be configured so that both the upper area and the lower area protrude further toward the front of the vehicle than the middle area. For example, when the second chamber is viewed from the passenger side, the middle area may be a U-shape or a C-shape that is recessed toward the rear. In this case, by positioning the upper area of ​​the second chamber near the head of the passenger, the head that is prone to injury can be quickly restrained. In addition, by positioning the lower area near the waist of the passenger, the waist close to the center of gravity of the human body is pressed, thereby improving the restraint performance of the passenger in the initial stage of an accident.

[0019] The inner exhaust hole is formed at least in the upper region and the lower region of the second chamber, and more preferably in the middle region. With this structure, the flow of the inflation gas from the second chamber to the first chamber becomes smooth.

[0020] The front ends of the upper region and the lower region of the second chamber may be substantially aligned with the front end of the first chamber. In this case, the overall deployment shape and deployment action of the airbag including the first chamber and the second chamber are stable.

[0021] In addition, the front ends of the upper region and the lower region of the second chamber may protrude further forward than the front end of the first chamber. In this case, the second chamber can reliably restrain the head and waist of the occupant in a wide range at the initial stage of airbag deployment.

[0022] Furthermore, the front end of the first chamber may protrude further forward than the front ends of the upper region and the lower region of the second chamber. In this case, the capacity of the second chamber is reduced, which can promote rapid expansion of the first chamber.

[0023] In addition, a rectifying member is included that surrounds the inflator in the second chamber and restricts the flow of the inflation gas. The flow of the inflation gas to the second chamber can be controlled by the rectifying member. In particular, by providing openings at the upper and lower ends of the rectifying member that guide the inflation gas discharged from the inflator in the up-down direction, the gas can be quickly supplied to the upper and lower regions of the second chamber.

[0024] The second chamber can be manufactured by overlapping two panels of the same shape and sewing the periphery. In this case, the formation of the upper region and the lower region can be realized with a simple structure. That is, the second chamber can be easily manufactured by using two panels pre-formed in each of the upper region and the lower region. In addition, by inserting a baffle extending longitudinally at the front edge of the two panels, not only the width, i.e., the thickness of the second chamber can be increased, but also the exhaust hole for exhaust can be easily formed on the baffle.

[0025] The first chamber and the second chamber may be formed such that the upper end and the lower end thereof are substantially consistent in the vertical direction. With such a shape and configuration, there is an advantage in that the overall shape of the airbag including the first chamber and the second chamber is stable.

[0026] The second chamber may be arranged to overlap and unfold with the frame side wall portion when viewed from the side of the vehicle. In this case, the frame side wall portion reliably unfolds toward the seat center side while receiving a reaction force when the second chamber is unfolded. Even after unfolding, the frame side wall portion can receive pressure from the occupant and can reliably restrain the occupant in the seat center direction.

[0027] On the other hand, it can be configured so that the first chamber does not overlap and unfold with the frame side wall portion when viewed from the vehicle side. In this case, the unfolding action of the first chamber is not hindered by the side frame and the second chamber, and can be unfolded quickly and smoothly.

[0028] The side airbags involved in the present invention include a type that deploys on the door side, i.e., the outside of the seat, and a type that deploys toward the vehicle center side of the seat. The type of side airbag that deploys toward the vehicle center side of the seat is called a front side airbag, a front center airbag, a rear center airbag, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a perspective view illustrating the main external shape of a vehicle seat used for the vehicle seat according to the present invention, and illustration of the airbag unit is omitted.

[0030] Figure 2 It is an example of Figure 1 1 is a perspective view of a seat frame, which is an internal structure in which a framework of a vehicle seat shown in FIG. 1 functions, and illustration of an airbag unit is omitted.

[0031] Figure 3 1 is a schematic side view of the vehicle seat according to the present invention, illustrating a state in which the airbag unit is accommodated as viewed from the outside in the vehicle width direction.

[0032] Figure 4is a structural cross-sectional view of a vehicle seat according to the present invention, which corresponds to Figure 3 A portion of the cross section along the A1-A1 direction.

[0033] Figure 5 (A) is a schematic side view of the vehicle seat according to the present invention, and illustrates a state in which the airbag is deployed as viewed from the outer side in the vehicle width direction, that is, from the side opposite to the occupant. Figure 5 (B) is a front view of the airbag in the deployed state, illustrating the state of the rear viewed from the front in the traveling direction.

[0034] Figure 6 is a structural cross-sectional view of an airbag device according to a first embodiment of the present invention, wherein (A) is Figure 5 The cross section in the A1-A1 direction in (A) and (B) are Figure 5 (A) is the cross section of the A2-A2 direction, (C) is Figure 5 (A) A3-A3 cross section.

[0035] Figure 7 1 and 2 are top views of an airbag used in a side airbag device according to a first embodiment of the present invention before compression, wherein (A) shows the state as viewed from the inner side, i.e., the passenger side, and (B) shows the state as viewed from the outer side, i.e., the side opposite to the passenger side.

[0036] Figure 8 It is an explanatory diagram illustrating a structure of a panel constituting a second chamber of an airbag used in a side airbag device according to the first embodiment of the present invention.

[0037] Fig. 9 9(A) and 9(B) are explanatory diagrams illustrating the structure of a panel constituting a first chamber of an airbag used in the side airbag device according to the first embodiment of the present invention.

[0038] Fig.10 1 and 2 are explanatory diagrams or cross-sectional views illustrating the deployed state of the airbag device according to the first embodiment of the present invention, wherein (A) shows the state at the initial stage of deployment, and (B) shows the state at the later stage of deployment.

[0039] Fig.11 is an explanatory diagram illustrating an airbag deployment state in a side airbag device according to a second embodiment of the present invention, corresponding to Figure 5 (A) A1-A1 cross section.

[0040] Fig.121 and 1 , which are top views of an airbag used in a side airbag device according to a second embodiment of the present invention before compression, wherein (A) shows the state viewed from the inner side, i.e., the passenger side, and (B) shows the state viewed from the outer side, i.e., the side opposite to the passenger side.

[0041] Fig.13 It is a plan view illustrating a modification of the present invention. DETAILED DESCRIPTION

[0042] The vehicle seat equipped with the side airbag device according to the embodiment of the present invention is described based on the drawings. When the occupant is in a normal seat posture with most of the occupant's back in contact with the seat back, the occupant's torso is oriented "forward" and the opposite direction is "rearward". In the direction orthogonal to the front-rear direction, the right side of the occupant is "right" and the left side is "left". In the left-right direction, the area on the passenger side of the side frame of the seat is "inside", and the area on the opposite side of the occupant as viewed from the side frame is "outside".

[0043] Figure 1 This is a perspective view illustrating the main external shape of a vehicle seat used for the vehicle seat involved in the present invention, and the illustration of the airbag device (20) is omitted. Figure 2 This is an example of a Figure 1 The internal structure of the frame of the vehicle seat shown in the figure, namely, a three-dimensional view of the seat frame, and the illustration of the airbag device (20) is omitted. Figure 3 1 is a schematic side view of the vehicle seat according to the present invention, and illustrates a state in which the airbag device 20 is accommodated on a side surface close to a door of the vehicle seat, that is, on the near side, as viewed from the outside in the vehicle width direction.

[0044] The present invention is a vehicle seat, comprising a vehicle seat and a side airbag device (20) accommodated in the seat. The vehicle seat involved in this embodiment, when viewed as a part, is Figure 1 and Figure 2 As shown, the seat cushion 2 includes a seat cushion 2 on which an occupant sits, a seat back 1 forming a backrest, and a headrest 3 connected to the upper end of the seat back 1.

[0045] The backrest 1 is provided with a seat back frame 1f forming a seat frame, and a pad made of a polyurethane foam material or the like is provided on its surface and periphery, and the surface of the pad is covered with a skin 14 of leather, fabric, etc. The bottom side of the seat cushion 2 is provided with a seat frame 2f, and a pad made of a polyurethane foam material or the like is provided on its upper surface and periphery. The surface of the pad is covered with a skin 14 of leather, fabric, etc., and the ... Figure 4 The seat frame 2 f and the seat back frame 1 f are connected via a reclining mechanism 4 .

[0046] like Figure 2 As shown, the seat back frame 1f includes: side frames 10 arranged to be spaced apart from each other left and right and extending in the up-down direction; an upper frame connecting the upper ends of the side frames 10; and a lower frame connecting the lower ends of the side frames 10. The headrest 3 is formed by providing a buffer member on the outer side of the headrest frame.

[0047] Figure 4 is a cross-sectional view of the structure of the vehicle seat involved in the present invention, which corresponds to Figure 3 The side frame 10 is made of resin or metal, and is Figure 4 The side frame 10 has a frame side wall portion 10a extending in the vehicle travel direction when viewed in horizontal cross section from above. The airbag module, i.e., the side airbag device 20, is fixed to the inner side of the frame side wall portion 10a, i.e., the center side of the seat.

[0048] like Figure 4 As shown, the seat back 1 includes a side support portion 12, which protrudes in the vehicle travel direction, i.e., the front of the vehicle, at the side portion, i.e., the end portion, in the vehicle width direction. A side airbag device 20 is accommodated in a gap inside the side support portion 12 where no polyurethane pad 16 is provided. The side airbag device 20 includes: an airbag (34, 36) that restrains an occupant by inflating and deploying; and an inflator 30 that supplies inflation gas to the airbag (34, 36).

[0049] The seams 18, 22, 24 of the skin 14 of the seat back 1 are woven into the inner side and connected by sewing. In addition, the front seam 18 is configured to be torn when the airbag is deployed.

[0050] In addition, a starting point region 26 is formed in the side support portion 12. The starting point region 26 becomes a starting point when the side support portion 12 is bent toward the passenger side due to the expansion of the second chamber 36. Figure 5 and Figure 6 The starting area 26 may be any one of a cutout, a groove or a thin-walled area or a combination thereof. The starting area 26 may be formed only in the portion of the polyurethane 16 inside the side support portion 12. Alternatively, the starting area 26 may be omitted.

[0051] The airbag (34, 36) is covered with a soft outer cover 20a made of fabric. In the relationship between the first chamber 34 and the second chamber 36, the airbag (34, 36) is folded or rolled in a bellows manner, where "folding" includes rolling, and further, an appropriate optimal compression method can be adopted. Figure 4In the figure, symbol 25 indicates a door trim. Although not shown in detail, in the folded storage state of the airbag, in order to maintain the positional relationship when inflated and unfolded, the airbag overlaps in a flat unfolded plane state, and the second chamber and the first chamber are folded into one. If the second chamber and the first chamber are folded separately, it can be set that the folded second chamber part is closer to the inflator than the folded first chamber part, or between the folded first chamber part and the side frame. That is, the folded second chamber can be set on the passenger side relative to the folded first chamber.

[0052] Figure 5 (A) is a schematic side view of the vehicle seat according to the present invention, illustrating a state in which the airbag (34, 36) is deployed as viewed from the outer side in the vehicle width direction, that is, from the side opposite to the occupant. Figure 5 (B) is a front view of the airbag (34, 36) in the deployed state, illustrating the state viewed from the front of the vehicle. Figure 6 is a cross-sectional view of the structure of the airbag device involved in the first embodiment of the present invention, wherein (A) is Figure 5 The cross section in the A1-A1 direction in (A) and (B) are Figure 5 (A) is the cross section of the A2-A2 direction, (C) is Figure 5 (A) A3-A3 cross section. Figure 7 The diagram is a plan view of the airbag (34, 36) before compression, wherein (A) shows the state viewed from the inside, and (B) shows the state viewed from the outside.

[0053] like Figure 5 As shown in (A), the airbag (34, 36) includes: a first chamber 34 that is deployed forward of the side support portion 12; and a second chamber 36 that is deployed inward of the first chamber 34 in the vehicle width direction.

[0054] like Figure 6 As shown in (A), (B) and (C), the second chamber 36 is basically configured to overlap and expand with the frame side wall portion 10a when viewed from the side of the vehicle. On the other hand, the first chamber 34 is configured to expand without overlapping with the frame side wall portion 10a when viewed from the side of the vehicle.

[0055] The first chamber 34 includes a front chamber 34F located at the front and having a relatively small capacity, and a rear chamber 34R located at the rear and having a relatively large capacity. Figure 6 As shown in (B), the front chamber 34F and the rear chamber 34R are fluidically connected through the internal exhaust holes V34c and V34d, and the expansion gas flows from the rear chamber 34R to the front chamber 34F. Figure 5As shown in (B), exhaust holes V34a and V34b for exhausting gas to the outside are provided at the front end of the front chamber 34F.

[0056] As mentioned above, Figure 6 As shown in (A), (B) and (C) of FIG. 1 , the airbag (34, 36) includes: a first chamber 34 that is deployed forward of the side support portion 12 of the seat; and a second chamber 36 that accommodates the inflator 30 and begins to deploy before the first chamber 34 on the inner side of the first chamber 34 in the vehicle width direction. Figure 5 (A) and Figure 6 As shown in (A) and (B), internal exhaust holes V1 and V2 for allowing inflation gas to flow from the second chamber 36 into the first chamber 34 are provided at the partition or boundary portion between the first chamber 34 and the second chamber 36 .

[0057] As mentioned above, Figure 6 As shown in (A), (B) and (C), when viewed from the side of the vehicle, the second chamber 36 is deployed overlapping the frame side wall portion 10a. In this case, the frame side wall portion 10a is reliably deployed toward the seat center while receiving a reaction force when the second chamber 36 is deployed. Even after deployment, the frame side wall portion 10a can receive pressure from the occupant and can reliably restrain the occupant toward the seat center.

[0058] On the other hand, the first chamber 34 is deployed without overlapping with the frame side wall portion when viewed from the side of the vehicle. Therefore, the first chamber 34 can be deployed quickly and smoothly without being interfered by the side frame 10 and the second chamber 36.

[0059] like Figure 7 As shown, the second chamber 36 can be divided into an upper region 36U and a lower region 36L, and a middle region 36M located between the upper region 36U and the lower region 36L. Here, at least one of the upper region 36U and the lower region 36L is configured to protrude further toward the front of the vehicle than the middle region 36M. In addition, in the embodiment, both the upper region 36U and the lower region 36L are configured to protrude further toward the front of the vehicle than the middle region 36M, but depending on the shape of the first chamber 34, etc., only one of them may be configured to protrude.

[0060] In the embodiment, the second chamber 36 may be in a U-shape or C-shape with a middle area recessed rearward when viewed from the passenger side. When the airbag is deployed, the upper area 36U of the second chamber 36 is located near the head of the passenger and can quickly restrain the head, which is easily injured. In addition, by locating the lower area 36L near the waist of the passenger and pressing the waist close to the center of gravity of the human body, the passenger restraint performance in the initial stage of an accident can be improved.

[0061] The front ends of the upper region 36U and the lower region 36L of the second chamber 36 are formed to substantially coincide with the front end of the first chamber 34. In this case, the airbag including the first chamber 34 and the second chamber 36 is integrally formed, and has the advantage of having a stable overall deployment shape.

[0062] like Fig.13 As shown in (A), the front end portions of the upper region 36U and the lower region 36L of the second chamber 36 may protrude further forward than the front end portion of the first chamber 34. In this case, the second chamber 36 can reliably restrain the occupant's head and waist in a wider range at the initial stage of airbag deployment.

[0063] Or, if Fig.13 As shown in (B), the front end of the first chamber 34 may protrude further forward than the front ends of the upper region 36U and the lower region 36L of the second chamber 36. In this case, the capacity of the second chamber 36 becomes relatively small, and the gas in the second chamber 36 quickly flows into the first chamber 34, and can promote the rapid deployment of the first chamber 34.

[0064] Refer again Figure 7 The first chamber 34 and the second chamber 36 are shaped in a substantially identical manner at the upper and lower ends in the vertical direction. With this shape and structure, the overall shape and deployment action of the airbag including the first chamber 34 and the second chamber 36 are stable.

[0065] Figure 8 1 is an explanatory diagram illustrating a panel structure constituting the second chamber 36. The second chamber 36 can be manufactured by overlapping two panels 136a, 136b of the same shape and sewing the periphery. In this way, by using two panels pre-formed into the upper region 36U and the lower region 36L, the second chamber 36 can be easily manufactured.

[0066] In the second chamber 36, two vents V1a and V2a are formed in the outer plate 136b connected to the first chamber 34. The vent V1a is formed at a position corresponding to the lower region 36L. In addition, the vent V2a is formed at a position corresponding to the middle region 36M. In this way, by dispersing the vents V1a and V2a, the flow of the inflation gas from the second chamber 36 to the first chamber 34 becomes smooth.

[0067] Fig. 9(A) and (B) are explanatory diagrams showing the panel structure constituting the first chamber 34. The first chamber 34 can be manufactured by overlapping two panels 134a and 134b having the same shape and sewing the periphery. Also, two vents V1b, V2b are formed in the inner plate 134a connected to the second chamber 36. These openings correspond to the vents V1a, V2a of the second chamber 36, respectively, see Figure 8 , and by sewing the peripheries of the overlapping openings, internal vents V1, V2 are formed, see Figure 5 (A).

[0068] A longitudinally extending baffle 134c is connected to the portions indicated by the dotted lines of the two panels 134a and 134b. Figure 5 (A) and (B) and Figure 6 As shown in (B) and (C), the first chamber 34 is divided into a front chamber 34F and a rear chamber 34R.

[0069] Fig.10 1 is an explanatory diagram or a cross-sectional view illustrating the deployment state of the airbag device according to the first embodiment, wherein (A) shows the initial stage of deployment and (B) shows the state at the later stage of deployment. Fig.10 As shown in (A), in the first embodiment of the present invention with the above structure, at the initial stage of the operation of the airbag device 20, the second chamber 36 inside the side support portion 12 is deployed, and at the same time as the seat cover 14 is torn from the stitching portion 18, the top end side of the side support portion 12 is deformed by bending or protruding toward the inside of the vehicle with the area 26 as the starting point, and the occupant is pushed to the inside in the vehicle width direction to be restrained.

[0070] By the expansion of the second chamber 36, the front part of the side support portion 12 is deformed to protrude toward the passenger side, so that the generation of a force that pushes the passenger from the back to the oblique front can be avoided or minimized, and the movement of the passenger in the direction of pulling out the seat belt can be avoided. In other words, the danger to the passenger can be suppressed and the restraint performance can be maximized.

[0071] Next, if Fig.10 As shown in (B), when the airbag (34, 36) is further inflated, the first chamber 34 is fully deployed toward the front of the vehicle and protects the occupant in the event of a collision.

[0072] In this embodiment, if Figure 5 (B) and Figure 7As shown in (A), since the second chamber 36 has the upper area 36U and the lower area 36L protruding forward, the airbag device can restrain the head and waist of the occupant in the early stage after the start of the operation. In addition, there is an advantage that the overall shape of the airbag can be maintained in the initial stage of deployment while minimizing the increase in the volume of the second chamber 36.

[0073] Fig.11 is an explanatory diagram illustrating an airbag deployment state in a side airbag device according to a second embodiment of the present invention, corresponding to Figure 5 (A) A1-A1 cross section. Fig.12 1 is a top view of a state before compression of an airbag used in a side airbag device according to a second embodiment, wherein (A) represents a state observed from the inside, and (B) represents a state observed from the outside. In this embodiment, since there are many similarities with the first embodiment, the same or corresponding components will be given the same reference numerals to avoid repeated descriptions, and the description will be centered on the differences.

[0074] In the present embodiment, for example, a tubular rectifying member 200 that surrounds the inflator 30 and restricts the flow of the inflation gas is provided inside the second chamber 36. Thus, the flow of the inflation gas to the second chamber 36 can be controlled. Also, openings for guiding the gas exhausted from the inflator 30 in the up-down direction are provided at the upper and lower ends of the rectifying member 200, and the gas can be quickly supplied to the upper region 36U and the lower region 36L of the second chamber 36.

[0075] The present invention has been described in conjunction with the above exemplary embodiments, but it is obvious that many equivalent changes and modifications can be made by those skilled in the art based on the present disclosure. Therefore, the above exemplary embodiments of the present invention are considered to be illustrative rather than restrictive. Various changes can be made to the described embodiments without departing from the spirit and scope of the present invention. For example, in a specific embodiment, although the near-side side airbag is mainly described, the far-side side airbag, i.e., the side of the door away from the vehicle seat and the single-seat vehicle such as a small motor vehicle and other ultra-small vehicles, can also be used, regardless of the presence or absence of doors, including a vehicle with only one seat in a row.

Claims

1. A vehicle seat, comprising: a seat cushion forming a seating surface; and a seat back, which forms a backrest and has a side support portion, the side support portion protruding toward the vehicle travel direction, that is, the front of the vehicle at the side portion, that is, the end portion in the vehicle width direction, characterized in that the vehicle seat comprises: a frame side wall portion provided inside the side support portion and extending in a vehicle traveling direction when a horizontal cross section is viewed from above; and A side airbag device comprising: an airbag that restrains an occupant by inflating and deploying toward the inner side of the frame side wall portion in the vehicle width direction; and an inflator that supplies inflation gas to the airbag, The airbag has: a first chamber that opens toward the front of the side support portion; and a second chamber that accommodates the inflator and begins to deploy earlier than the first chamber on the inner side of the first chamber in the vehicle width direction; An internal exhaust hole is provided in a partition between the first chamber and the second chamber, and the internal exhaust hole is used to allow the expansion gas to flow from the second chamber into the first chamber. The second chamber includes an upper region and a lower region, and an intermediate region between the upper region and the lower region. When viewed from the side in the vehicle width direction, at least one of the upper region and the lower region is configured to protrude further toward the front of the vehicle than the middle region. The first chamber includes a baffle, which divides the first chamber into a front chamber and a rear chamber and extends in the longitudinal direction. When viewed from the side in the vehicle width direction, the baffle is arranged to extend in the longitudinal direction in the first chamber along the front edge of the second chamber, and the capacity of the rear chamber is greater than that of the front chamber. The inner exhaust hole includes a first inner exhaust hole and a second inner exhaust hole, the first inner exhaust hole is formed at a position corresponding to the lower area, the second inner exhaust hole is formed at a position corresponding to the middle area, and in the front-rear direction of the vehicle, the first inner exhaust hole is located further forward than the second inner exhaust hole, The upper region and the lower region are both configured to protrude further toward the front of the vehicle than the middle region. When viewed from the passenger side, the middle area of ​​the second chamber is developed in a U-shape or a C-shape that is recessed rearward. The baffle of the first chamber is aligned with the front periphery of the second chamber in a lateral direction perpendicular to the vehicle travel direction, and the baffle forms a U-shape or a C-shape similar to that of the second chamber when the second chamber is deployed. The front ends of the upper region and the lower region of the second chamber are aligned with the front end of the first chamber. The rear chamber of the first chamber and the second chamber are formed such that, in the vertical direction, the upper end portion is consistent with the lower end portion. When viewed from the side in the vehicle width direction, the first cavity and the second cavity have different shapes. The first cavity has a shape without a depression in the center portion, and the second cavity has a shape with a depression in a C shape in the center portion.

2. The vehicle seat according to claim 1, characterized in that: In the deployed state, the upper area of ​​the second chamber is located near the head of the occupant, and the lower area is located near the waist of the occupant.

3. The vehicle seat according to claim 1, characterized in that: The inner exhaust hole is formed in plurality.

4. The vehicle seat according to claim 1, characterized in that: The first chamber is divided into the front chamber and the rear chamber by overlapping two panels of the same shape, inserting the baffle extending in the longitudinal direction into the middle portion, and sewing the periphery.

5. The vehicle seat according to claim 1, characterized in that: Also includes: A rectification member surrounds the inflator inside the second chamber and restricts a flow of the inflation gas.

6. The vehicle seat according to claim 5, characterized in that: The rectifying member includes openings at an upper end portion and a lower end portion, the openings being configured to guide the inflation gas discharged from the inflator in an upward and downward direction.

7. The vehicle seat according to claim 1, characterized in that: The second chamber is made by overlapping two panels of the same shape and sewing the perimeter.

8. The vehicle seat according to claim 1, characterized in that: The second chamber is arranged to overlap and expand with the frame side wall portion when viewed from the side of the vehicle, The first chamber is arranged so as not to overlap with the frame side wall portion when viewed from the side of the vehicle.

9. A side airbag device, wherein: The side airbag device is mounted on the vehicle seat according to any one of claims 1 to 8.

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