JP7384776B2 - Vehicle side airbag - Google Patents

Description

The present invention relates to a side airbag for a vehicle.

Patent Document 1 discloses a side airbag that is inflated and deployed on the side of an occupant during a side collision. The side airbag disclosed in Patent Document 1 includes a head protection inflatable part (head chamber) that restrains the head of an occupant, a waist protection inflatable part (lumbar chamber) that restrains the waist of the occupant, and a head protection inflatable part (waist chamber) that restrains the occupant's waist. It is configured to include an intermediate inflatable part that connects the lower back protection inflatable part and the lower back protection inflatable part. Furthermore, in Patent Document 1, an inner tube (duct member) is arranged inside the intermediate inflation section, and this inner tube distributes gas generated in the inflator to the head protection inflation section and the waist protection inflation section. .

Japanese Patent Application Publication No. 2011-105107

By the way, in the side airbag described in Patent Document 1, since the length of the inner tube (duct member) is short, the head chamber and the waist chamber may not be able to be inflated and deployed quickly. As a countermeasure to this problem, a configuration may be considered in which the upper end of the inner tube is extended to the head chamber, and the lower end of the inner tube is extended to the waist chamber. However, if the length of the inner tube is increased, the inner tube will swing due to the high pressure gas flowing in from the inflator, making it difficult to inflate and deploy the head chamber and waist chamber to the target positions.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a side airbag for a vehicle that can quickly inflate and deploy a head chamber and a lumbar chamber at a targeted position.

The vehicle side airbag according to claim 1 is housed inside a vehicle seat, and is inflated and deployed on the side of an occupant by receiving gas supply from an inflator when a side collision is predicted or detected. a bag body including a head chamber that covers the side of the occupant's head and a waist chamber that covers the side of the occupant's waist in the state; and a connection portion provided inside the bag body and to which the inflator is connected. and a duct portion that vertically connects the head chamber and the waist chamber when the bag main body is inflated and deployed, and has a cylindrical shape, and at least a portion of the rear edge portion in the inflated and deployed state is cylindrical. a duct member sewn to the bag main body, the duct member having a region located above the upper end of the seat back and below the upper end of the seat back when the bag main body is inflated and deployed. The area is sewn separately .

In the vehicle side airbag according to the first aspect, the bag body is housed inside the vehicle seat. Further, when a side collision is predicted or detected, the bag body receives gas from an inflator and is inflated and deployed on the side of the occupant. Here, the bag body includes a head chamber that covers the sides of the occupant's head in an inflated and deployed state, and a waist chamber that covers the sides of the occupant's waist. As a result, the side parts of the occupant can be protected over a wide range by the bag body in the event of a side collision of the vehicle.

Further, a cylindrical duct member is provided inside the bag body, and this duct member includes a connecting portion to which an inflator is connected. Further, the duct member includes a duct portion that vertically connects the head chamber and the waist chamber when the bag body is inflated and deployed. As a result, the gas generated in the inflator flows into the head chamber and the waist chamber through the connection part of the duct member and the duct part, and the gas generated in the inflator flows into the head chamber and the waist chamber more quickly than in a configuration where the duct member is not provided. Gas can flow into the chamber and the lumbar chamber. Furthermore, since at least a portion of the rear edge of the duct member is sewn into the bag body, even if high-pressure gas flows into the duct member, swinging of the duct member can be suppressed and the head It is possible to prevent the inflation and deployment positions of the lower chamber and the lower back chamber from shifting.
Furthermore, since the duct member is sewn to the bag body separately above and below the upper end of the seat back, the portion of the duct member located at the upper end of the seat back is not sewn to the bag body. Thereby, the duct member can be arranged so that when gas flows through the duct member to the head chamber, it passes through the shortest distance regardless of the position of the bag body.

In a vehicle side airbag according to a second aspect of the present invention, in the first aspect, the bag body and the duct member are co-sewn.

In the vehicle side airbag according to the second aspect, by co-sewing the duct member to the bag body, the number of manufacturing steps can be reduced compared to a configuration in which the duct member and the bag body are sewn separately.

According to a third aspect of the present invention, in the vehicle side airbag according to the first or second aspect, the duct member is sewn to the bag body at least in a region including the connecting portion.

In the vehicle side airbag according to the third aspect, the connecting portion of the duct member is sewn to the bag body. Here, the connection part of the duct member where the inflator is connected is the part where the gas generated by the inflator first flows, so if the connection part swings, the entire duct part located on the downstream side of the gas swings. This causes the gas flow path to become unstable. On the other hand, if the connection part is sewn to the bag body, the swinging of the connection part can be suppressed, and the swinging of the duct part due to the swinging of the connection part can be suppressed.

In the vehicle side airbag according to claim 4, in any one of claims 1 to 3, the part of the duct member and the head chamber are folded at the upper end of the seat back along the seat width direction. The seat belt is stored in an upright position, and is inflated and deployed toward the space between the headrest and the upper rear surface of the shoulder belt that restrains the occupant's upper body to the seat back.

In the vehicle side airbag according to the fourth aspect, the head chamber is inflated and deployed toward the space between the upper rear surface of the shoulder belt and the headrest. This allows the occupant's head to be restrained early in the event of a side collision. In addition, the head chamber can obtain a reaction force from the shoulder belt by being sandwiched between the head of the occupant and the shoulder belt, and can restrain the head of the occupant with a small capacity.

As explained above, according to the vehicle side airbag according to the present invention, the head chamber and the waist chamber can be quickly inflated and deployed at the target positions.

1 is a front view showing a vehicle seat to which a vehicle side airbag according to an embodiment is applied, showing a state in which the side airbag is inflated and deployed. 1 is a side view showing a vehicle seat to which a vehicle side airbag according to an embodiment is applied, showing a state in which the side airbag is inflated and deployed. It is a figure which shows the flat pattern of the bag main body before sewing in embodiment. It is a figure which shows the flat pattern of the duct member before sewing in embodiment. FIG. 2 is a diagram schematically showing a state of the side airbag according to the embodiment before folding. 6 is a diagram corresponding to FIG. 5 and showing a modification of the side airbag according to the embodiment. FIG. (A) is a schematic view schematically showing a side airbag according to an embodiment as seen from the front side of the seat, and (B) is a schematic diagram showing a side airbag according to a modification as seen from the front side of the seat. FIG.

Hereinafter, a vehicle side airbag 10 according to an embodiment will be described with reference to the drawings. Note that arrow FR, arrow UP, and arrow RH in each figure indicate the front side of the seat, the upper side of the seat, and the right side of the seat, respectively, of the vehicle seat 14 in which the vehicle side airbag 10 is mounted. When the directions are described using front, rear, left, right, up and down directions, unless otherwise specified, the front and back directions of the seat, the left and right sides of the seat width direction, and the up and down directions of the seat up and down direction are indicated.

(Vehicle seat 14)
As shown in FIG. 1, a vehicle seat 14 on which a vehicle side airbag 10 of the present embodiment (hereinafter simply referred to as "side airbag 10") is mounted includes a seat cushion 16, a seat back 18, and It is configured to include a headrest 20. Further, as shown in FIG. 2, a side airbag device 12 includes the side airbag 10 of this embodiment and the inflator 42. Note that the vehicle seat 14 shown in FIGS. 1 and 2 is arranged, for example, at the driver's seat on the left side of the vehicle, and the front of the seat is aligned with the front of the vehicle. Further, the left and right sides in the seat width direction are in a state where they are aligned with the left and right sides in the vehicle width direction.

In the vehicle seat 14 shown in FIGS. 1 and 2, a dummy P for collision testing is seated instead of an actual occupant. This dummy P is, for example, AM50 (50th percentile of American adult males) of WorldSID (World Side Impact Dummy). Hereinafter, for convenience of explanation, the dummy P will be referred to as "occupant P".

The seat cushion 16 extends in the seat longitudinal direction and the seat width direction, and is configured to be able to support the buttocks and thighs of the occupant P. The seat back 18 is rotatably connected to the rear end of the seat cushion 16 and extends in the seat up-down direction, and is configured to be able to support the back of the occupant P. The headrest 20 is provided at the upper end of the seat back 18 and is configured to support the head H of the occupant P.

(Seat belt device 24)
As shown in FIG. 1, the occupant P is restrained in the vehicle seat 14 by the seat belt device 24. The seat belt device 24 includes a webbing 26, a tongue plate 30, a buckle 32, and a retractor (not shown).

The webbing 26 is formed in the shape of a long belt, and includes a shoulder belt 26A that restrains the upper body of the occupant P to the seat back 18 when worn, and a lap belt 26B that restrains the waist L of the occupant. . The shoulder belt 26A extends diagonally from the shoulder S on the left side of the occupant P to the waist L on the right side. The lower end of the shoulder belt 26A is passed through the tongue plate 30.

The tongue plate 30 is passed through the webbing 26 and is configured to be detachable from a buckle 32 provided on the left side of the seat. Then, by attaching the tongue plate 30 to the buckle 32, the occupant P is restrained by the webbing 26.

The webbing 26 extends from the tongue plate 30 to the left side of the seat, and the portion extending in the width direction of the seat constitutes a lap belt 26B. Therefore, the right end of the lap belt 26B is connected to the lower end of the shoulder belt 26A. Further, the left end portion of the lap belt 26B is fixed to a belt anchor 34 provided on the floor panel 40.

The upper end of the shoulder belt 26A is wrapped around a shoulder anchor (not shown) provided on the vehicle body. Further, the end of the webbing 26 is wound up by a retractor (not shown). Here, when the webbing 26 is suddenly pulled out, an emergency locking mechanism of the retractor is activated to lock the webbing 26 being pulled out. Further, the retractor is provided with a pretensioner mechanism that is activated when a collision is detected and forcibly winds up the webbing 26.

(Side airbag device 12)
As shown in FIG. 2, the side airbag device 12 includes an inflator 42 and a side airbag 10. Further, the side airbag 10 includes a bag body 46 and a duct member 48. The duct member 48 is also referred to as a sock, an inner tube, a rectifying cloth, or a diffuser.

The inflator 42 is a cylinder-shaped gas generator formed in a substantially cylindrical shape, and its axial direction is along a side frame (not shown) that constitutes the frame of the seat back 18 . Further, a lower end portion 42A of the inflator 42 is connected to a connecting portion 46A of the side airbag 10. A gas jetting portion is provided at the lower end portion 42A of the inflator 42, and when a side collision of the vehicle is detected or predicted, gas is generated from the gas jetting portion and gas is supplied to the side airbag 10. Ru.

The side airbag 10 is housed inside the seatback 18 and is inflated by being supplied with gas generated by the inflator 42, and the skin of the seatback 18 is ruptured by the inflation pressure of the side airbag 10. It is inflated and deployed to the outer side in the seat width direction with respect to the occupant P.

Here, the side airbag 10 has a lumbar chamber (lower chamber) 46B that is inflated and deployed on the outside in the seat width direction from the shoulders S to the waist L of the occupant P, and a lumbar chamber (lower chamber) 46B that is inflated and deployed on the outside of the head H of the occupant P in the seat width direction. The head chamber (upper chamber) 46C is expanded. The side airbag 10 is configured as an integral bag body in which a waist chamber 46B and a head chamber 46C communicate with each other.

The lumbar chamber 46B in the inflated and deployed state is arranged from the upper part to the lower end of the seat back 18 when viewed from the seat width direction, and is formed in a substantially elliptical shape with the vertical center part bulging out toward the front side of the seat. . Further, the head chamber 46C in the inflated and deployed state is arranged from the headrest 20 to the upper end of the seat back 18, and is formed in a substantially rectangular shape so as to cover the head H of the occupant P when viewed from the seat width direction. There is. Further, a portion between the waist chamber 46B and the head chamber 42B is located at the upper end of the seat back 18, and is formed to have a short length in the vehicle longitudinal direction when viewed from the seat width direction.

As shown in FIG. 1, the head chamber 46C is configured to be expanded and expanded toward the space between the upper rear surface of the shoulder belt 26A and the headrest 20. In this embodiment, as an example, the head chamber 46C is stored in the upper end of the seat back 18 in a folded state along the seat width direction together with a duct member 48 to be described later. Then, by supplying gas to the head chamber 46C, the skin of the upper end of the seat back 18 is ruptured by the expansion pressure of the head chamber 46C, and the head is directed toward the space between the shoulder belt 26A and the headrest 20. The inner chamber 46C is configured to expand and expand. The way the head chamber 46C and the duct member 48 are folded is not particularly limited, and various folding methods may be adopted as long as they are configured to expand and expand toward the space between the shoulder belt 26A and the headrest 20.

(Side airbag 10)
As shown in FIG. 3, the bag body 46 constituting the side airbag 10 is formed into a substantially bag shape by sewing two base fabrics 52 and 54. Here, a two-dot chain line S1 shown on the base cloth 52 in FIG. 3 indicates a portion where the base cloth 52 and the base cloth 54 are to be sewn. In addition, in the description of FIGS. 3 to 5, when "up and down" is used, unless otherwise specified, it refers to the up and down direction of the seat in the inflated and deployed state of the side airbag 10, and the front and back of the seat front and back direction.

The base fabric 52 includes a connecting portion forming portion 52A, a waist chamber forming portion 52B, and a head chamber forming portion 52C. The waist chamber forming part 52B is a part that becomes the waist chamber 46B, and is formed in a substantially rectangular shape with the vertical direction as the longitudinal direction.

The connecting part configuring part 52A is a part that constitutes the connecting part 46A (see FIG. 2) to which the inflator 42 is connected, and has a shape that projects diagonally upward toward the rear from the rear end of the lower part of the waist chamber component 52B. is formed. Further, the head chamber component 52C is provided above the waist chamber component 52B, and is formed in a substantially rectangular shape.

The base fabric 54 is formed in a shape that is symmetrical with respect to the base fabric 52, and similarly to the base fabric 52, it is configured to include a connection portion configuration portion 54A, a waist chamber configuration portion 54B, and a head chamber configuration portion 54C. ing. Then, the bag body 46 is formed by sewing the two base fabrics 52 and 54 along the sewing area S1 with the base fabric 54 superimposed on the base fabric 52.

As shown in FIG. 5, a duct member 48 is provided inside the bag body 46. The duct member 48 is formed into a substantially cylindrical shape with open upper and lower ends, and includes a connecting portion 48A and a duct portion 48B.

The connecting portion 48A is formed in substantially the same shape as the connecting portion 46A of the bag body 46, and is configured to be connected to the inflator 42. Therefore, the inflator 42 is connected to both the connecting portion 46A of the bag body 46 and the connecting portion 48A of the duct member 48. In this embodiment, as an example, a stud bolt (not shown) protruding from the outer circumference of the inflator 42 is passed through the connecting portion 46A and the connecting portion 48A, and is fastened to the side frame of the seat back 18 with a nut or the like.

The duct portion 48B of the duct member 48 extends in the seat vertical direction so as to vertically connect the head chamber 46C and the waist chamber 46B of the bag body 46. An upper opening 48C that opens into the head chamber 46C is formed at the upper end of the duct portion 48B. Further, a lower opening 48D that opens into the waist chamber 46B is formed at the lower end of the duct portion 48B.

As shown in FIG. 4, the duct member 48 constituting the side airbag 10 is formed into a substantially cylindrical shape by sewing two base fabrics 56 and 58. Here, the two-dot chain lines S2, S3, and S4 shown on the base fabric 56 in FIG. 4 indicate the portions to be sewn when the base fabric 56 and the base fabric 58 are sewn.

The base fabric 56 is configured to include a connecting portion forming portion 56A and a duct forming portion 56B. The connecting portion constituting portion 56A is a portion that constitutes the connecting portion 48A (see FIG. 5) to which the inflator 42 is connected, and has a shape that protrudes diagonally upward toward the rear from the lower end and rear end of the duct portion 48B. It is formed. Further, the duct portion forming portion 56B is formed in a substantially rectangular shape with the vertical direction as the longitudinal direction.

The base cloth 58 is formed in a shape that is laterally symmetrical with respect to the base cloth 56, and similarly to the base cloth 56, it is configured to include a connection portion forming portion 58A and a duct portion forming portion 58B. Then, the duct member 48 is formed by sewing the two base cloths 56 and 58 along the sewing areas S2, S3, and S4 with the base cloth 58 superimposed on the base cloth 56.

In this embodiment, at least a portion of the rear edge of the duct member 48 is sewn to the bag body 46. Specifically, as shown in FIG. 5, a part of the bag main body 46 and a part of the duct member 48 are co-stitched at a sewing part 60 and a sewing part 62. In FIG. 5, the portion indicated by the thick line is the co-stitched portion.

The sewn portion 60 is a portion where a portion of the portion S1 to be sewn in the bag body 46 and a portion S2 to be sewn in the duct member 48 are sewn together. Specifically, the sewn portion 60 is a portion sewn along the lower edges of the connecting portion 46A and the connecting portion 48A. Further, the sewn portion 62 is a portion sewn from the upper edges of the connecting portions 46A and 48A to the upper end of the duct member 48 along the rear edge of the bag body 46.

Therefore, in this embodiment, the sewing parts 60 and 62 where the bag main body 46 and the duct member 48 are sewn together are provided in a region including the connecting part 46A. On the other hand, in the bag main body 46, the sewing part 64 excluding the sewing parts 60 and 62 is a part where only two base fabrics, the base fabric 52 and the base fabric 54 of the bag main body 46, are sewn.

In the duct member 48, in the sewing part 66 excluding the sewing parts 60 and 62, only two base cloths, the base cloth 56 and the base cloth 58 of the duct member 48, are sewn at the sewing scheduled part S4 shown in FIG. It is a part. Therefore, the sewn portion 66 is not visible from the outside after the side airbag 10 is manufactured.

When sewing the bag body 46 and the duct member 48 together, the duct member 48 is positioned inside the bag body 46 with the base fabric 56 and the base cloth 58 sewn in the sewing area S4 of the duct member 48. Place it. In this embodiment, since the connecting portion 46A of the bag body 46 and the connecting portion 48A of the duct member 48 have substantially the same shape, the bag body 46 and the duct member 48 may be positioned at these portions.

After the positioning of the bag body 46 and the duct member 48 is completed, pins are driven at predetermined intervals along the outer periphery of the bag body 46 to temporarily secure them. Then, the side airbag 10 is manufactured by sewing the temporarily secured state using the sewing sections 60, 62, and 64.

Furthermore, one end of the tether T is sewn to the rear end of the head chamber 46C of the bag body 46. The tether T is formed of a long cloth material, and the other end of the tether T is fixed to a headrest stay (not shown) to deploy the head chamber 46C to a desired position. There is.

(effect)
Next, the operation of this embodiment will be explained.

As shown in FIG. 2, the vehicle side airbag 10 according to the present embodiment is inflated and deployed on the side of the occupant P by receiving gas from the inflator 42 when predicting or detecting a side collision. Here, the bag main body 46 includes a head chamber 46C that covers the sides of the head H of the occupant P in an inflated and deployed state, and a waist chamber 46B that covers the sides of the waist L of the occupant P. Thereby, the sides of the occupant P can be protected over a wide range by the bag body 46 in the event of a side collision.

In particular, since the head chamber 46C is expanded and deployed in the space between the shoulder belt 26A and the headrest 20, the head H of the occupant P can be restrained early in the event of a side collision. In addition, the head chamber 46C can obtain reaction force from the shoulder belt 26A by being sandwiched between the head H of the occupant P and the shoulder belt 26A, and can restrain the head H of the occupant P with a small capacity. be able to.

Here, as shown in FIG. 5, a cylindrical duct member 48 is provided inside the bag body 46, and this duct member 48 includes a connecting portion 48A to which the inflator 42 is connected. ing. Further, the duct member 48 includes a duct portion 48B that vertically connects the head chamber 46C and the waist chamber 46B when the bag body 46 is inflated and deployed. As a result, the gas generated from the inflator 42 (see FIG. 2) flows into the head chamber 46C and waist chamber 46B via the connecting portion 48A and duct portion 48B of the duct member 48, and the duct member 48 is Gas can flow quickly into the head chamber 46C and the waist chamber 46B compared to a configuration in which the gas is not connected.

Furthermore, in this embodiment, at least a portion of the rear edge of the duct member 48 is sewn to the bag body 46 by the sewing parts 60 and 62, so even if high-pressure gas flows into the duct member 48, , the swinging of the duct member 48 can be suppressed. As a result, it is possible to prevent the inflation and deployment positions of the head chamber 46C and the waist chamber 46B from shifting, and it is possible to quickly inflate and deploy the head chamber 46C and the waist chamber 46B at the target positions. In particular, it is possible to effectively prevent the head chamber 46C from shifting its deployed position and being deployed to the outside of the shoulder belt 26A.

Furthermore, in this embodiment, the duct member 48 is co-sewn to the bag body 46. Thereby, the number of manufacturing steps can be reduced compared to the case where the duct member 48 and the bag body 46 are sewn separately.

Furthermore, in this embodiment, since the connecting portion 48A of the duct member 48 is sewn to the bag body 46, it is possible to suppress the swinging of the connecting portion 48A. As a result, it is possible to suppress the downstream duct portion 48B from swinging due to the swinging of the connecting portion 48A.

Note that in this embodiment, the entire rear edge of the duct member 48 is co-sewn to the bag body 46 by the sewing parts 60 and 62, but the invention is not limited thereto. For example, a modified structure shown in FIG. 6 may be adopted.

(Modified example)
As shown in FIG. 6, a vehicle side airbag 70 (hereinafter simply referred to as "side airbag 70") according to the present modification includes a bag body 46 and a duct member 48 similarly to the embodiment. It consists of Here, in this modification, the part where the bag body 46 and the duct member 48 are sewn together is different.

Similar to the embodiment, the sewn portion 60 is a portion sewn along the lower edges of the connecting portion 46A and the connecting portion 48A.

On the other hand, a sewing part 72 is provided which is co-sewn along the rear edge of the bag body 46 from the upper edges of the connecting parts 46A and 48A. The sewn portion 72 corresponds to a region below the upper end of the seat back 18 when the bag body 46 is in an inflated and deployed state. That is, the bag main body 46 and the duct member 48 are sewn together in a region from the connecting portion 46A to the upper part of the waist chamber 46B.

Furthermore, a sewn portion 74 is provided at the upper end of the duct member 48, which is co-stitched along the rear edge of the bag body 46. The sewn portion 74 is located in an area above the upper end of the seat back 18 when the bag body 46 is inflated and deployed, that is, in the area of the head chamber 46C.

The area between the sewing part 72 and the sewing part 74, that is, the area corresponding to the upper end of the seat back 18 when the bag body 46 is inflated and deployed, is a sewing part 76 that is not sewn together. That is, the co-stitched areas are separated vertically, and the sewn portion 76 where the duct member 48 is not sewn to the bag body 46 is an area that can freely move with respect to the bag body 46.

In the side airbag 70 according to the modified example described above, the duct member 48 can move freely in the upper end region of the seat back 18, so that gas can be more quickly supplied to the head chamber 46C.

This effect will be explained with reference to FIG. FIG. 7(A) is a schematic diagram of the side airbag 10 in the inflated and deployed state according to the embodiment viewed from the front side of the seat, and FIG. 7(B) is a schematic diagram of the side airbag 70 in the inflated and deployed state according to the modified example. FIG.

As shown in FIG. 7(A), in the side airbag 10 of the embodiment, the duct member 48 is co-stitched to the bag body 46 in a region from the waist chamber 46B to the head chamber 46C by a sewing section 62. Therefore, the position of the duct member 48 follows the position of the bag body 46.

On the other hand, as shown in FIG. 7(B), in the modified side airbag 70, the co-sewn sewing portion 72 and the sewing portion 74 are vertically separated, and the sewing portion 72 and the sewing portion 74 are vertically separated. In the region of the sewing parts 76 between the sewing parts 74, the duct member 48 is not co-stitched to the bag body 46. Thereby, when high-pressure gas is supplied to the side airbag 70, the duct member 48 can be placed at a position that connects the waist chamber 46B and the head chamber 46C over the shortest distance.

Although the side airbags 10 and 70 according to the embodiments and modified examples have been described above, it goes without saying that the invention can be implemented in various forms without departing from the gist of the invention. For example, in the above embodiment, as shown in FIG. 5, the duct member 48 and the bag main body 46 are sewn together at the sewing section 60 and the sewing section 62, but the present invention is not limited thereto. That is, after the cylindrical duct member 48 that has been sewn is placed inside the bag body 46, the duct member 48 may be sewn to the bag body 46 using the sewing section 60 and the sewing section 62. However, the number of manufacturing steps can be reduced by sewing the duct member 48 and the bag body 46 together. Furthermore, the amount of sewing material used for sewing can be reduced, which is advantageous in terms of reducing manufacturing costs.

Further, in the above embodiment, as shown in FIG. 1, a configuration has been described in which the head chamber 46C is expanded and deployed in the space between the shoulder belt 26A and the headrest 20, but the present invention is not limited to this. For example, a structure may be adopted in which the head chamber 46C is inflated and deployed further outward in the seat width direction than the shoulder belt 26A. Even in this case, if the duct member 48 connects the waist chamber 46B and the head chamber 46C vertically and the rear edge of the duct member 48 is sewn to the bag body 46, the head chamber 46C and the waist chamber 46B can be connected vertically. The effect of being able to quickly inflate and deploy at the target position can be obtained.

Furthermore, the waist chamber is not limited to the shape illustrated in FIG. 2 as long as it covers the waist L of the occupant P from the side. Similarly, the head chamber 46C is not limited to the shape illustrated in FIG. 2 as long as it covers the head H of the occupant P from the side.

10, 70 Vehicle side airbag 14 Vehicle seat 18 Seat back 20 Headrest 26A Shoulder belt 42 Inflator 46 Bag body 46B Waist chamber 46C Head chamber 48 Duct member 48A Connection portion 48B Duct portion H Head L Waist region P Occupant

Claims (4)

A head that is stored inside a vehicle seat and is inflated and deployed on the side of the occupant by receiving gas from an inflator when a side collision is predicted or detected, and that covers the side of the occupant's head in the inflated and deployed state. a bag body comprising a lower chamber and a lower back chamber that covers the side of the lower back of an occupant;
A cylindrical structure including a connection part provided inside the bag body and to which the inflator is connected, and a duct part vertically connecting the head chamber and the waist chamber when the bag body is inflated and deployed. a duct member, at least a portion of which is sewn to the bag body in an inflated and deployed state;
has
The duct member is sewn separately into a region located above the upper end of the seat back and a region located below the upper end of the seat back when the bag main body is inflated and deployed. Airbag. The vehicle side airbag according to claim 1, wherein the bag body and the duct member are co-sewn. The vehicle side airbag according to claim 1 or 2, wherein the duct member is sewn to the bag body at least in a region including the connection portion. A portion of the duct member and the head chamber are stored in the upper end of the seat back in a folded state along the seat width direction, and are also connected to the upper rear surface of a shoulder belt that restrains the occupant's upper body to the seat back. The vehicle side airbag according to any one of claims 1 to 3, wherein the vehicle side airbag is inflated and deployed toward the space between the headrest and the headrest.