JP2018161925A - Side airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance performance for protecting a shoulder part of an occupant.SOLUTION: A long gas generator 30 and an airbag body 41 are incorporated into a storage section in a side part of vehicle outside in a seat back of a vehicle sheet. The inside of the airbag body 41 is partitioned into an upper expansion chamber and a lower expansion chamber 101 below the upper expansion chamber by a lateral partition part 50. The upper expansion chamber is partitioned into an upper rear expansion chamber 103 extended and expanded on a side part of at least a shoulder part of an occupant and an upper front expansion chamber 102 on a front side of the upper rear expansion chamber by a vertical partition part 60. The upper part of the vertical partition part 60 is inclined to be away from an axial line L1 of a gas generator 30 toward a front part in an axial perpendicular direction perpendicular to a coaxial line L1 along a side wall part of a vehicle as it goes to the upper side. A distance D1 from the axial line L1 in the axial perpendicular direction to an upper front end 60a of the vertical partition part 60 is set to be longer than a distance D2 from the coaxial line L1 to a front end 50a of the lateral partition part 50.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a side airbag that protects an occupant from an impact by deploying and inflating an airbag between the occupant seated on the vehicle seat and the side wall when an impact is applied to the side wall of the vehicle. Relates to the device.

  A side airbag device provided with an airbag and a gas generator is effective as a device for protecting an occupant seated on a vehicle seat when an impact is applied to the side wall of the vehicle due to a side collision or the like. Both of these airbags and gas generators are incorporated in the side portion of the vehicle seat outside the vehicle seat back.

  For example, in the side airbag device described in Patent Document 1, as shown in FIG. 11, the outer shell portion of the airbag 120 is constituted by an airbag body 121. The airbag body 121 is partitioned into an upper expansion chamber and a lower expansion chamber 123 by a horizontal partition portion 122. Further, the upper expansion chamber is divided into an upper front expansion chamber 125 and an upper rear expansion chamber 126 by the vertical partition portion 124.

  According to the side airbag device configured as described above, when an impact is applied to the side wall portion due to a side collision or the like, the inflation gas is supplied from the gas generator 127 to the lower expansion chamber 123, the upper rear expansion chamber 126, and the upper front expansion chamber 125. Is done. The expansion gas causes the lower expansion chamber 123 to be on the side of the waist portion PP of the occupant P, and the upper rear expansion chamber 126 to be on the side of the shoulder portion PS of the occupant P and the side of the rear half of the chest PT. The upper front expansion chamber 125 expands and expands on the side of the front half of the chest PT, respectively, and protects the upper body of the occupant P from impact.

JP 2017-13746 A

  However, the vehicle seat is attached to the floor portion of the vehicle body at the lower part. For this reason, if the rigidity of the vehicle seat is not sufficiently high, the vehicle seat is deformed in a rotation mode as indicated by an arrow in FIG. There is a fear. In this case, the amount of deformation increases as the distance from the mounting location increases, that is, the upper side of the vehicle seat. In addition, with the above deformation, the airbag 120 and the gas generator 127 incorporated in the side portion of the seat back also move substantially rearward.

  Therefore, the airbag main body 121 is deployed and inflated at a portion of the upper half of the occupant P that is shifted rearward from the side of the portion to be protected. The amount of deviation at this time is small at the lower part of the airbag body 121 and larger at the upper rear expansion chamber 126 located at the upper part. As a result, there is a concern that the upper rear expansion chamber 126 expands and expands at a position shifted from the side of the shoulder PS to the rear, and the performance of protecting the shoulder PS is reduced.

  This invention is made | formed in view of such a situation, The objective is to provide the side airbag apparatus which can improve the performance which protects a passenger | crew's shoulder part.

  A side airbag device that solves the above-described problems includes a long gas generator that is incorporated in a storage portion in a side portion on the vehicle outer side of a seat back of a vehicle seat, the gas generator that is incorporated in the storage portion, and the gas generator. Between the occupant seated on the vehicle seat and the side wall of the vehicle, inflated by the inflation gas supplied from the vehicle, leaving a part of itself in the storage portion An airbag main body that is deployed and inflated forward, and the inside of the airbag main body is partitioned by a lateral partition portion into an upper expansion chamber and a lower expansion chamber below the same expansion chamber. The chamber is partitioned by a vertical partition into an upper rear expansion chamber that expands and expands at least on the side of the shoulder of the occupant, and an upper front expansion chamber on the front side of the upper rear expansion chamber. The upper part of the partition part is closer to the upper side. A distance from the axis in the axis orthogonal direction to the upper front end of the vertical section in the axis orthogonal direction that is inclined from the axis of the vessel to the front in the axis orthogonal direction orthogonal to the coaxial line along the side wall However, it is set longer than the distance from the coaxial line to the front end of the horizontal section.

  According to the above configuration, when an impact is applied to the side wall of the vehicle, the gas generator supplies the inflation gas to each of the lower inflation chamber, the upper rear inflation chamber, and the upper front inflation chamber of the airbag body. The airbag main body is inflated by the inflation gas, exits from the seat back in a state where a part of the airbag body is left in the storage portion, and forwards between the occupant seated on the vehicle seat and the side wall portion. expand. In the airbag main body, the upper rear expansion chamber is deployed and inflated at least on the side of the shoulder of the occupant. In addition, the lower expansion chamber and the upper front expansion chamber expand and expand on the sides of the occupant's upper body, which are different from the shoulders, respectively. The upper body of the occupant is protected from impact by the expansion and expansion of the lower expansion chamber, the upper rear expansion chamber, and the upper front expansion chamber.

  Here, the direction orthogonal to the coaxial line from the axis of the gas generator along the side wall is defined as the axis orthogonal direction. Then, the distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical partition is set to be longer than the distance from the coaxial line to the front end of the horizontal partition. The rear expansion chamber expands forward in the direction perpendicular to the axis.

  Therefore, when an impact is applied to the side wall, even if the vehicle seat is deformed in a mode in which the vehicle seat rotates with the attachment point with the floor of the vehicle body as a fulcrum, the upper rear expansion chamber is It is interposed between the shoulder and the side wall, and protects the shoulder from an impact transmitted through the side wall.

  In the side airbag device, the front peripheral portion constituting the front portion of the peripheral portion of the airbag body has a part of the inclined peripheral portion that inclines so as to move away from the axis to the front in the axis orthogonal direction toward the upper side. And the front end of the horizontal partition is located below the inclined peripheral edge of the front peripheral edge, and the upper front end of the vertical partition is of the front peripheral edge. Of these, it is preferable to be positioned above the inclined peripheral edge.

  According to said structure, a part of front peripheral part of an airbag main body is comprised by the inclined peripheral part which inclines so that it may move away from the axis of a gas generator to the front in an axial orthogonal direction, so that the front The airbag body expands forward in the direction perpendicular to the axis as compared with the case where the part of the peripheral portion is parallel to the coaxial line. Further, due to the inclination of the above aspect, the distance from the axis in the direction perpendicular to the axis to the inclined peripheral edge is longer at the upper part than at the lower part.

  The front end of the horizontal partition is located below the inclined peripheral edge. On the other hand, the upper part is in the vertical partition part that inclines so as to move away from the axis in the direction orthogonal to the axis as the upper side is located, and the upper front end part is located above the inclined peripheral part in the front peripheral part. Yes.

  Therefore, the distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical section is longer than the distance from the coaxial line to the front end of the horizontal section, and the upper rear expansion chamber is expanded forward in the direction perpendicular to the axis. It becomes possible.

  In the side airbag device, when the interval between the front end portion of the horizontal partition portion and the upper front end portion of the vertical partition portion in the direction along the axis is defined as a vertical interval, the axis line in the direction orthogonal to the axis The vertical distance when the distance to the upper front end of the vertical section is longer than the distance from the coaxial line to the front end of the horizontal section is set to be the same or equivalent to the vertical distance when the distance is short. It is preferable.

  According to the above configuration, the vertical distance between the front end of the horizontal partition in the direction along the axis and the upper front end of the vertical partition is the distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical partition. The case where the distance is longer than the distance from the coaxial line to the front end portion of the horizontal section and the case where the distance is shorter are the same or equivalent. In both cases, assuming that the vertical position of the front end of the horizontal partition is the same, the vertical position of the upper front end of the vertical partition is the same or equivalent when the upper rear expansion chamber is expanded and expanded. Therefore, the upper and rear expansion chambers when the distance is long expands forward in the direction perpendicular to the axis at the same or equivalent vertical position as when the distance is short. As a result, a change in performance for protecting the shoulder due to a change in the vertical position of the upper rear expansion chamber hardly occurs.

  The equivalent vertical distance is not the same, but the difference from the same is small enough to allow a change in the performance of protecting the shoulder due to the change in the position of the upper rear expansion chamber in the direction along the axis. Vertical spacing.

  In the side airbag device, the airbag main body includes a main body cloth portion on the vehicle inner side and a main body cloth portion on the outer side of the vehicle, and the vertical partition portion is located above the horizontal partition portion between the two main body cloth portions. Each of the peripheral portions on the vehicle inner side and the vehicle outer side of the vertical partition part is connected to the adjacent main body cloth part by an upper vertical connection part, and the upper part of each upper vertical connection part is closer to the upper side than the axis line. Is inclined so as to move away from the front in the direction perpendicular to the axis, and the lower portion of each upper vertical coupling portion extends along the axis, and the boundary portion between the upper portion and the lower portion of each upper vertical coupling portion is A distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical partition is from a coaxial line to the front end of the horizontal partition. The curved portion when the distance is longer than It is preferable that the curved at larger radius than the curved portion of the case are.

  According to the above configuration, when the curved portion is curved with a small radius, the stress due to the pressure of the inflation gas tends to concentrate on the curved portion, which may cause a reduction in strength. In addition, when the upper longitudinal coupling portion is formed by stitching, it is difficult to perform stitching with a small radius.

  In this regard, by setting the radius of the curved portion to be large so as to satisfy the above relationship, the stress acting on the curved portion is dispersed by the pressure of the inflation gas. The curved portion exhibits a high strength necessary for proper deployment without causing damage or the like. In addition, since the bending portion gradually changes as the radius of the bending portion increases, when the upper longitudinal coupling portion is formed by sewing, the bending operation of the bending portion is facilitated.

  In the side airbag device, in the airbag main body, the inflation gas from the gas generator is rectified so as to go to the upper rear expansion chamber and the lower expansion chamber, and from the lower expansion chamber, An inner tube having a check valve at the lower portion for restricting the flow of the expansion gas to the upper rear expansion chamber is provided, and the vertical rear section communicates the upper rear expansion chamber and the upper front expansion chamber. It is preferable that a communicating portion is provided.

  According to the above configuration, when the expansion gas is ejected from the gas generator in response to the impact applied to the side wall, the expansion gas is distributed to the lower expansion chamber and the upper rear expansion chamber by the inner tube. . A part of the expansion gas distributed to the upper rear expansion chamber is supplied to the upper front expansion chamber via the communication portion. Further, the expansion gas distributed to the lower expansion chamber is restricted by a check valve from flowing (backflowing) to the upper rear expansion chamber. As a result, the lower expansion chamber, the upper rear expansion chamber, and the upper front expansion chamber expand and expand on the side of the upper half of the occupant seated on the vehicle seat to protect the occupant from impact.

  According to the side airbag device, the performance of protecting the passenger's shoulder can be enhanced.

The side view which shows the vehicle seat provided with the side airbag apparatus in one Embodiment with a passenger | crew. In one embodiment, the plane cross section which shows the positional relationship of a vehicle seat, an airbag, a passenger | crew, and a side wall part. 1 is a front sectional view showing a positional relationship among a vehicle seat, an airbag, an occupant, and a side wall portion in one embodiment. In one embodiment, the partial plane sectional view showing the internal structure of the side part of the vehicle outside in the seat back in which the air bag module is incorporated. 1 is a side view of an airbag module in a state where an airbag main body is only deployed and is not inflated in one embodiment. (A) is a side view explaining the dimensional relationship of the airbag module in one Embodiment, (b) is a side view explaining the dimensional relationship of the airbag module in a prior art. It is sectional drawing of the airbag module in the 7-7 line | wire of FIG. 5, (a) is sectional drawing of the state which the airbag main body only expand | deployed and is not expanded, (b) is the airbag main body expand | deployed and expanded. Sectional drawing of a state. It is sectional drawing of the airbag module in the 8-8 line | wire of FIG. 5, (a) is sectional drawing of the state which the airbag main body only expand | deployed and is not expanded, (b) is the airbag main body expand | deployed and expanded. Sectional drawing of a state. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 5, (a) is a cross-sectional view in a state where the airbag main body is only deployed and is not inflated, and (b) is a cross-sectional view in a state where the airbag main body is expanded and inflated. . (A) is a development view of the airbag main body, (b) is a development view of the horizontal section and the first check valve, (c) is a development view of the vertical section, the first inner tube and the second check valve, (D) is a development view of the second inner tube, and (e) is a development view of the third inner tube. The side view which shows the conventional side airbag apparatus with the vehicle seat and a passenger | crew.

Hereinafter, an embodiment of a side airbag device will be described with reference to FIGS.
In the following description, the forward direction of the vehicle will be described as the front, and the reverse direction of the vehicle will be described as the rear. Further, with the center in the vehicle width direction of the vehicle as a reference, the side approaching the center is defined as “vehicle inside”, and the side far from the center is defined as “vehicle outside”. In addition, it is assumed that an occupant having the same physique as the collision test dummy is seated on the vehicle seat. This dummy is, for example, AM50 (a model that covers 50% of US adult males) of an international unified side collision dummy (WorldSID).

  As shown in FIGS. 1 to 3, in the vehicle 10, a vehicle seat 12 is disposed in the vicinity of the vehicle interior of the side wall portion 11. Here, the side wall portion 11 refers to a vehicle constituent member disposed on a side portion of the vehicle 10, and mainly corresponds to a door, a pillar, and the like. For example, the side wall 11 corresponding to the front seat is a front door, a center pillar (B pillar), or the like. The side wall portion 11 corresponding to the rear seat is a rear portion of a side door (rear door), a C pillar, a front portion of a tire house, a rear quarter, and the like.

  The vehicle seat 12 includes a seat cushion 13 and a seat back 14. The seat cushion 13 is attached to a rail (not shown) installed on the floor of the vehicle body so that the front-rear position can be adjusted. The seat back 14 stands up in an inclined state so as to be positioned rearward from the rear portion of the seat cushion 13 to the upper side, and is configured to be able to adjust the inclination angle. The vehicle seat 12 is disposed in the passenger compartment with the seat back 14 facing forward. The width direction of the vehicle seat 12 arranged in this way matches the vehicle width direction.

Next, the internal structure of the side portion on the vehicle outer side in the seat back 14 will be described.
Inside the seat back 14, a seat frame forming the skeleton is arranged. As shown in FIG. 4, a part of the seat frame is disposed on the vehicle outer side portion in the seat back 14, and this portion (hereinafter referred to as “side frame portion 15”) is formed by bending a metal plate or the like. Is formed by. A seat pad 16 made of an elastic material such as urethane foam is disposed on the front side of the seat frame including the side frame portion 15. A hard backboard 17 made of synthetic resin or the like is disposed on the rear side of the seat frame. Although the seat pad 16 is covered with a skin, the skin is not shown in FIG.

  In the seat pad 16, a storage portion 18 is provided in the vicinity of the vehicle exterior side of the side frame portion 15. An air bag module ABM that forms the main part of the side air bag device is incorporated in the storage portion 18.

  A slit 19 extends from the corner of the storage portion 18 diagonally forward and toward the vehicle exterior. A portion sandwiched between the corner 16c on the front side of the seat pad 16 and the slit 19 (a portion surrounded by a two-dot chain line in FIG. 4) constitutes a planned breaking portion 21 to be broken by the airbag 40 described later. ing.

The airbag module ABM includes a gas generator 30 and an airbag 40 as main components. Next, each of these structural members will be described.
<Gas generator 30>
As shown in FIGS. 4 and 5, the gas generator 30 includes an inflator 31 and a retainer 32 that covers the inflator 31, and has a long shape as a whole. Here, a type called a pyrotype is adopted as the inflator 31. The inflator 31 has a substantially cylindrical shape, and a gas generating agent (not shown) that generates an expansion gas is accommodated therein. The inflator 31 has a gas ejection part 31a at its lower end. In addition, a harness (not shown) serving as an input wiring for an operation signal to the inflator 31 is connected to the upper end portion of the inflator 31.

  As the inflator 31, instead of the pyro type using the gas generating agent, a type (hybrid type) in which a partition wall of a high pressure gas cylinder filled with a high pressure gas is broken with an explosive or the like to eject an expansion gas is used. May be.

  On the other hand, the retainer 32 is a member having a function of fastening the inflator 31 to the side frame portion 15 together with the airbag 40 while functioning as a diffuser that controls the direction in which the inflation gas is ejected. Most of the retainer 32 is formed in a substantially cylindrical shape by bending a plate material such as a metal plate. A pair of bolts 33 is fixed to the retainer 32 as a locking member for attaching the retainer 32 to the side frame portion 15. The gas generator 30 may be one in which an inflator 31 and a retainer 32 are integrated.

  The gas generator 30 is incorporated in the storage unit 18 in an inclined state so as to be located on the rear side as it goes upward. Details will be described later. Accordingly, the axis L1 of the gas generator 30 is also inclined so as to be located on the rear side as it is above. Here, a direction orthogonal to the axis L1 of the gas generator 30 along the side wall 11 is referred to as an “axis orthogonal direction”.

<Airbag 40>
As shown in FIGS. 5 and 10, the airbag 40 includes an airbag body 41, a horizontal partition 50, a first check valve 59, a vertical partition 60, a first inner tube 72, a second check valve 74, Each member of the 2nd inner tube 81 and the 3rd inner tube 86 is couple | bonded by the coupling | bond part 48,54,55,58,68,69,71,91,92,94.

FIGS. 10A to 10E are development views before the respective members are folded in half.
As the material of each member, a material that has high strength and is flexible and can be easily folded, for example, a woven fabric formed using polyester yarn, polyamide yarn, or the like is suitable. Each coupling part 48, 54, 55, 58, 68, 69, 71, 91, 92, 94 is formed by sewing (sewing) with a sewing thread, but is formed by other means, for example, adhesion. May be.

Next, each member constituting the airbag 40 will be described.
<Airbag body 41>
As shown in FIGS. 5 and 10A, the airbag body 41 constitutes an outer shell portion of the airbag 40. For the formation of the airbag main body 41, one piece of cloth (also called a base cloth, a panel cloth or the like) is used. A folding line 42 extending in the vertical direction is set on the cloth piece. The cloth pieces are folded in two along the folding line 42 and overlapped in the vehicle width direction. Here, in order to distinguish the two overlapped portions of the airbag main body 41, the one located on the vehicle interior side is referred to as a main body cloth portion 43, and the one located on the vehicle outer side is referred to as a main body cloth portion 44 ( (See (a) in FIGS. 7 to 9).

  The main body cloth portions 43 and 44 are regions corresponding to many parts of the upper body of the occupant P when the airbag main body 41 is deployed and inflated between the vehicle seat 12 and the side wall portion 11, in this embodiment. It is formed in a shape and size that can occupy a region corresponding to a region from the waist PP to the shoulder PS (see FIG. 1).

  As shown in FIG. 6 (a), the front peripheral edge 45 constituting the front portion of the peripheral edge of the airbag body 41 is linearly inclined so as to move away from the axis L1 to the front in the direction perpendicular to the axis. The inclined peripheral edge 45a is part of itself. In this respect, as shown in FIG. 6B, this embodiment is a conventional side airbag in which a portion 121a corresponding to the inclined peripheral edge 45a is formed in parallel to the axis L1 in the front peripheral edge. Different from the device.

As shown in FIG. 5, an insertion port 46 of the gas generator 30 is opened at the upper rear end of the airbag body 41.
Both the main body cloth portions 43 and 44 are coupled by a peripheral coupling portion 48 provided along many portions of the peripheral portions (see each (a) of FIGS. 7 to 9). Many parts are parts except the rear end part (the vicinity part of the folding line 42) etc. among the peripheral parts of both main body cloth parts 43 and 44. FIG.

  When the portion located at the inclined peripheral edge portion 45a of the peripheral edge connecting portion 48 is defined as an inclined peripheral edge connecting portion 48a, the inclined peripheral edge connecting portion 48a is also moved away from the axis L1 to the front in the axis orthogonal direction toward the upper side. Inclined. As shown in FIG. 6 (b), this point is the same as the conventional side airbag device in which the portion 128a corresponding to the inclined peripheral joint portion 48a of the peripheral joint portion 128 is formed in parallel to the axis L1. Different.

  As shown in FIG. 5, the portion between the main body cloth portions 43 and 44 and surrounded by the peripheral edge coupling portion 48 constitutes an expansion portion (expansion space) 49 that expands and expands by the expansion gas. Yes.

<Horizontal partition 50 and first check valve 59>
As shown in FIGS. 5, 8 (a), and 10 (b), one horizontally long piece of cloth is used to form the horizontal partition 50 and the first check valve 59. The cloth piece is folded in two along a folding line 51 extending in the up-down direction and overlapped in the vehicle width direction. Of the cloth pieces folded in half, a portion located on the vehicle interior side includes a transverse compartment cloth portion 52 and an extending portion 56 extending substantially downward from the rear portion of the transverse compartment cloth portion 52. Moreover, the part located in the vehicle outer side is provided with the horizontal division cloth part 53 and the extension part 57 extended from the rear part of the horizontal division cloth part 53 substantially downward. The cloth piece may be divided into two along the fold line 51.

The entire cloth piece folded in two is disposed between the main body cloth portions 43 and 44 with its fold line 51 aligned with the fold line 42.
The lateral partition cloth portions 52 and 53 overlapped in the vehicle width direction are formed of the main body cloth portions 43 and 44 by an upper lateral joint portion 54 provided so as to extend in the front-rear direction along the peripheral edge on the upper side thereof. It is connected to the adjacent one. That is, the horizontal partition fabric portion 52 is coupled to the main body fabric portion 43, and the horizontal partition fabric portion 53 is coupled to the main body fabric portion 44.

  The lower part of the lateral partition cloth parts 52 and 53 is provided so that the front part of the extended parts 56 and 57 extends substantially in the front-rear direction along the lower peripheral edge part of the lateral partition cloth parts 52 and 53. They are coupled to each other by the lateral coupling portion 55 (see FIG. 9A). Further, the front end portions of both the transverse partition fabric portions 52 and 53 are stitched together with the lower portion of the inclined peripheral edge portion 45a by the lower portion of the inclined peripheral edge connecting portion 48a.

  The front end portion of the upper horizontal coupling portion 54 intersects the lower portion of the inclined peripheral coupling portion 48a. The intersection of each upper lateral coupling portion 54 with the inclined peripheral coupling portion 48 a constitutes the front end portion 50 a of the lateral partition portion 50. The distances from the axis L1 to the front end portions 50a in the axis orthogonal direction are the same. By combining the both lateral partition fabric portions 52 and 53 in the above-described manner, the lateral partition portion 50 in a state of being spanned between the two main body fabric portions 43 and 44 is configured (see FIG. 9A). ).

  The space below the horizontal partition 50 in the inflating portion 49 is a lower inflating chamber 101 that expands and inflates on the side of the waist PP in the upper half of the occupant P (FIGS. 1 and 8A). FIG. 9 (a)). Further, the space above the horizontal partition 50 is an upper expansion chamber.

Further, as described above, the extension portions 56 and 57 are not coupled by the lower lateral coupling portion 55, whereby the lower expansion chamber 101 and the upper expansion chamber are communicated with each other.
As shown in FIGS. 5 and 8 (a), the two extending portions 56 and 57 stacked in the vehicle width direction are coupled to each other by an inclined coupling portion 58 provided along their front edge portions. Yes. The upper end portion of the inclined coupling portion 58 is connected to the rear end portion of the lower lateral coupling portion 55. In addition, the rear portions of the extending portions 56 and 57 are sewn together to the lower rear end portions of the main body cloth portions 43 and 44 by lower lower end portions formed so as to be lower toward the front side in the peripheral edge coupling portion 48. . A lower end between the extending portions 56 and 57 is opened, and the extending portions 56 and 57 constitute a cylindrical first check valve 59 extending substantially downward.

<Vertical compartment 60, first inner tube 72, and second check valve 74>
As shown in FIG. 5 and FIG. 10 (c), for the formation of the vertical partition 60, the first inner tube 72, and the second check valve 74 as the check valve, one irregularly shaped piece of cloth is formed. It is used. The cloth piece is folded in two along a folding line 61 extending in the up-down direction and overlapped in the vehicle width direction. Of the folded piece of cloth, the portion located inside the vehicle has a vertically long rectangular tube part 62, a longitudinally divided cloth part 63 adjacent to the front side of the tube part 62, and an extension extending substantially downward from the tube part 62. And a projecting portion 64. Further, the portion located outside the vehicle includes a vertically long rectangular tube portion 65, a longitudinal partition fabric portion 66 adjacent to the front side of the tube portion 65, and an extending portion 67 extending substantially downward from the tube portion 65. Yes. The cloth piece may be divided into two along the fold line 61.

  Each vertical section cloth part 63 and 66 has a different shape in the upper part and the lower part. The upper part of each vertical section cloth part 63,66 inclines so that it may move away from the said axis line L1 to the front in an axis orthogonal direction, so that an upper side may be carried out. The upper front end portion of each of the vertical partition fabric portions 63 and 66 is located above the inclined peripheral edge portion 45 a in the front peripheral edge portion 45 of the airbag body 41. The lower part of each vertical partition cloth part 63, 66 extends along the coaxial line L1 in a state parallel or nearly parallel to the axis L1.

  The whole cloth piece folded in two is arranged between the main body cloth portions 43 and 44 with its fold line 61 matched with the fold lines 42 and 51. In addition to this, the lower part of the cloth piece folded in two, more specifically, the lower part of both tube parts 62 and 65 and the extended parts 64 and 67 are located between both horizontal partitioning cloth parts 52 and 53 of the horizontal partitioning part 50. And between the extending portions 56 and 57.

  When the vertical partition cloth portions 63 and 66 do not overlap the horizontal partition portion 50, the main body of the airbag main body 41 is formed by an upper front vertical joint portion 68 as an upper vertical joint portion extending along the front peripheral edge portion. It couple | bonds with the adjacent thing among the cloth parts 43 and 44 (refer Fig.7 (a)). That is, the longitudinal compartment cloth portion 63 on the vehicle interior side is coupled to the main body cloth portion 43, and the longitudinal compartment cloth portion 66 on the vehicle exterior side is coupled to the main body fabric portion 44.

  As shown in FIG. 6 (a), each upper front vertical coupling portion 68 is inclined so as to move away from the axis L1 to the front in the direction perpendicular to the axis at the upper part of each vertical partition fabric portion 63, 66. Yes. The upper front end portion of the upper front vertical coupling portion 68 intersects the peripheral coupling portion 48. The intersection of each upper front vertical coupling portion 68 with the peripheral coupling portion 48 constitutes the upper front end portion 60 a of the vertical partition 60.

  Here, as shown in FIGS. 6A and 6B, the distance from the axis L1 in the direction orthogonal to the axis to the upper front end portions 60a and 124b of the vertical partition portions 60 and 124 is D1, and the coaxial line L1 The distance to the front end parts 50a and 122a of the horizontal partition parts 50 and 122 is D2.

In the prior art shown in FIG. 6B, the distance D1 is shorter than the distance D2, but in the present embodiment shown in FIG. 6A, the distance D1 is set longer than the distance D2.
Each upper front longitudinal coupling portion 68 extends along the coaxial line L1 in a state of being parallel or nearly parallel to the axis L1 at the lower part of each vertical partition fabric portion 63, 66. Each upper front vertical coupling portion 68 is curved so as to swell rearward at the boundary portion between the upper and lower portions of each vertical partition fabric portion 63, 66. In order to distinguish this portion of each upper front vertical coupling portion 68 from other portions of the same front vertical coupling portion 68, it is referred to as a curved portion 68a. The radius R1 of the curved portion 68a is set to be larger than the radius R2 of the curved portion 124a in the prior art shown in FIG.

  In addition, the interval between the front end portions 50a and 122a of the horizontal partition portions 50 and 122 and the upper front end portions 60a and 124b of the vertical partition portions 60 and 124 in the direction along the axis L1 is defined as the vertical interval. When the vertical distance in the present embodiment (FIG. 6A) is longer than the distance D2 and the vertical distance is C1, and the vertical distance in the short conventional technique (FIG. 6B) is C2, the vertical distance C1. Is set equal to or equivalent to the vertical interval C2. The equivalent vertical distance C1 is not the same, but the difference from the same is that the performance of protecting the shoulder PS due to the change in the position of the upper rear expansion chamber 103 in the direction along the axis L1 is allowed. The vertical spacing is as small as possible.

  Moreover, as shown in FIG.5 and FIG.10 (c), each vertical division cloth part 63,66 is the location of horizontal division cloth part 52,53 by the lower front vertical connection part 69 in the location which overlaps with the horizontal division part 50. As shown in FIG. Only the adjacent ones are connected. That is, the longitudinal compartment cloth 63 on the inner side of the vehicle is coupled to the lateral compartment cloth 52, and the longitudinal compartment 66 on the outside of the vehicle is coupled to the lateral compartment cloth 53. Each lower front vertical coupling portion 69 extends along the peripheral edge on the front side of each vertical partition fabric portion 63, 66 in a state of being parallel or nearly parallel to the axis L1 below the upper front vertical coupling portion 68. Yes.

  Both vertical partition cloth parts 63 and 66 are connected to each other by an upper rear vertical coupling part 71 provided along the rear peripheral edge part thereof (see FIG. 9A). The lower part of the upper rear longitudinal connecting part 71 is located at the boundary between the lower part of both the vertical partition cloth parts 63 and 66 and the both tube parts 62 and 65. The upper rear vertical coupling portion 71 is inclined so as to move away from the axis L1 to the front in the direction perpendicular to the axis at the upper part of the vertical partition fabric portions 63 and 66. The upper rear vertical coupling portion 71 extends along the coaxial line L1 in a state of being parallel or nearly parallel to the axis L1 at the lower portion of the vertical partition fabric portions 63 and 66.

Further, the upper front end portions of the vertical partition fabric portions 63 and 66 are co-sewn on the upper side of the inclined peripheral edge portion 45 a in the front peripheral edge portion 45 of the airbag body 41 by the peripheral edge connecting portion 48.
Furthermore, the lower end part of each vertical division cloth part 63 and 66 is co-sewn to both the horizontal division cloth parts 52 and 53 of the horizontal division part 50 by the lower horizontal coupling part 55 mentioned above.

By joining the two vertical partition cloth parts 63 and 66 in the above-described manner, the vertical partition part 60 in a state of being spanned between the two main body cloth parts 43 and 44 is configured.
Moreover, the first inner tube 72 having both ends opened in the direction along the axis L1 is configured by connecting the tube portions 62 and 65 to each other by the lower portion of the upper rear longitudinal coupling portion 71 ( (See FIG. 8 (a)).

  As shown in FIGS. 1, 5, and 7 (a), the space behind the vertical partition 60 in the upper expansion chamber constitutes the upper rear expansion chamber 103. Many portions except the upper end portion of the gas generator 30 are arranged at the rear end portion in the upper rear expansion chamber 103. Details will be described later. The upper rear expansion chamber 103 expands and expands on the side of the rear half of the chest PT and the side of the shoulder PS in the upper half of the occupant P. In the upper rear expansion chamber 103, the portion that expands to the side of the shoulder portion PS of the occupant P is the rear portion of the upper inclined portion of the vertical partition fabric portions 63 and 66.

  In the upper expansion chamber, a portion on the front side of the vertical partition 60 constitutes the upper front expansion chamber 102. The upper front expansion chamber 102 expands and expands on the side of the front half of the chest PT in the upper half of the occupant P. The upper rear expansion chamber 103 and the upper front expansion chamber 102 are adjacent to each other in the front-rear direction through the vertical partition 60.

  The vertical partition 60 is formed with a communication portion 73 that allows the upper rear expansion chamber 103 and the upper front expansion chamber 102 to communicate with each other. In this embodiment, the communication part 73 is comprised by the round hole opened in each vertical division cloth part 63,66 (refer FIG.10 (c)).

In addition, the communication part 73 may be provided only for each of the vertical division cloth parts 63 and 66, or three or more. Moreover, the communication part 73 may be provided only in one side of both the vertical division cloth parts 63 and 66. FIG.
As shown in FIGS. 5 and 10 (c), the front edge portions of the two extending portions 64 and 67 stacked in the vehicle width direction are connected to the front edge portions of the two extending portions 56 and 57 by the inclined coupling portion 58. Are sewn together. In addition, the rear portions of the extended portions 64 and 67 are shared with the lower rear end portions of the main body cloth portions 43 and 44 together with the rear portions of the extended portions 56 and 57 by the lower rear end portion of the peripheral edge coupling portion 48. Sewn. The lower end between both the extension parts 64 and 67 is opened, and the extension part 64 and 67 constitutes a cylindrical second check valve 74 extending substantially downward (FIG. 8 ( a)).

As described above, the cloth-shaped first check valve 59 made of cloth is provided outside the cloth-shaped second check valve 74 so as to form a double cylinder.
Then, the second check valve 74 and the first check valve 59 are opened as shown in FIG. 8A to allow the expansion gas to flow from the upper rear expansion chamber 103 to the lower expansion chamber 101. Allowing and closing the valve as shown in FIG. 8B restricts the flow of the expansion gas from the lower expansion chamber 101 to the upper rear expansion chamber 103.

<Second inner tube 81>
As shown in FIG. 5 and FIG. 10 (d), a piece of cloth having a vertically long rectangular shape is used for forming the second inner tube 81. This cloth piece is folded in two along a fold line 82 extending in the vertical direction. By being folded in two, a tube portion 83 on the vehicle inner side and a tube portion 84 on the vehicle outer side are formed. Note that the second inner tube 81 may be composed of two pieces of cloth divided along the fold line 82.

  The entire cloth folded in two is arranged in the first inner tube 72 with its own fold line 82 matched with the fold lines 42, 51, 61. The front peripheral edges of the tube portions 83 and 84 are sewn together at the boundary between the vertical partition fabric portions 63 and 66 and the tube portions 62 and 65 by the lower portion of the upper and rear vertical coupling portion 71.

<Third inner tube 86>
As shown in FIG. 5 and FIG. 10 (e), one rectangular piece of cloth is used to form the third inner tube 86. The 3rd inner tube 86 has taken the structure provided with a some cloth layer, when the said cloth piece is diffracted in multiple times. In addition, in FIG. 7 (a), (b) and FIG. 8 (a), (b), the cloth of several layers is expressed by the thick continuous line. This multi-layered fabric piece is folded in two along a folding line 87 extending in the vertical direction. By being folded in two, a tube portion 88 on the vehicle inner side and a tube portion 89 on the vehicle outer side are formed.

  The entire cloth folded in two is arranged in the first inner tube 72 and the second inner tube 81 with its own fold line 87 matched with the fold lines 42, 51, 61, 82. ing. Thus, the 1st-3rd inner tubes 72, 81, 86 have comprised the triple cylinder shape which becomes an inside inside in this order. With such a configuration, the heat shielding action by the first to third inner tubes 72, 81, 86 is enhanced, and the effect of protecting the airbag 40 from the high-temperature inflation gas is enhanced. However, on the upper side and the lower side of the third inner tube 86, the first and second inner tubes 72 and 81 have a double cylindrical shape.

  The front peripheral edges of the tube portions 88 and 89 are formed by the lower portion of the upper / rear longitudinal connecting portion 71 together with the second inner tube 81 between the vertical partition cloth portions 63 and 66 and the tube portions 62 and 65. It is stitched together at the border.

  As described above, in the present embodiment, the first to third inner tubes 72, 81, and 86 are coupled to each other by the lower portion of the upper rear longitudinal coupling portion 71, thereby restraining each other and deforming each other separately. The rectification is stabilized by suppressing the change of the flow.

  Further, as shown in FIG. 5 and FIG. 7A, a common portion in the cylinder circumferential direction of the first to third inner tubes 72, 81, 86 having a triple cylindrical shape is an annular shape having a vertically long oval shape. The airbag 91 is coupled to the airbag body 41 by a coupling portion 91. In the present embodiment, the tube portions 62, 83, 88 on the vehicle inner side are coupled to the main body cloth portion 43 on the vehicle inner side by the annular coupling portion 91. This coupling enhances the action and effect of stabilizing the rectification.

  Further, as shown in FIGS. 5 and 8A, the first to third inner tubes 72, 81, 86 are also coupled to each other by a rear lateral coupling portion 92 extending in the cylinder circumferential direction. The rear lateral coupling portion 92 couples the tube portions 62, 83, and 88 inside the vehicle, and couples the tube portions 65, 84, and 89 outside the vehicle.

  And most parts except the upper end part of the gas generator 30 made into the attitude | position extended in a substantially up-down direction are penetrated in the rear-end part of the airbag main body 41 through the insertion port 46, and the 1st-3rd inner tube. 72, 81, and 86 are inserted. The gas ejection part 31a is disposed inside the portion where the first to third inner tubes 72, 81, 86 overlap each other. An upper end portion of the gas generator 30 is exposed to the outside of the airbag body 41.

  As shown in FIGS. 5 and 7A, the bolt 33 of the gas generator 30 includes tube portions 62, 83, 88 on the inner side of the first to third inner tubes 72, 81, 86, and the airbag body. 41 is inserted through the body cloth portion 43 on the vehicle interior side. By this insertion, the gas generator 30 is locked in a state of being positioned with respect to the first to third inner tubes 72, 81, 86 and the airbag body 41. The place where the bolt 33 is inserted in this way is an area where the cloth is reinforced by being surrounded by the annular coupling portion 91.

  Further, as shown in FIG. 5, the peripheral joint portion 48 in the airbag body 41 is separated from each other by releasing the joint of the main body cloth portions 43 and 44 at the lower front corner portion of the lower inflation chamber 101. A pair of terminal portions 93 are formed. The airbag main body 41 is provided with a pair of surrounding coupling portions 94 that couple the main body fabric portions 43 and 44 in a state of surrounding each terminal portion 93. A portion between the two main body cloth portions 43 and 44 and sandwiched between the two surrounding joint portions 94 allows the inside and outside of the lower expansion chamber 101 to communicate with each other, and the expansion gas in the lower expansion chamber 101 to the outside. An exhaust hole (also called a vent hole) 95 for discharging is formed.

  By the way, as shown in FIG. 4, in the airbag module ABM having the gas generator 30 and the airbag 40 as main constituent members, the airbag 40 (see FIG. 5) in a state where the airbag module ABM is not expanded but is expanded is folded. As a result, the storage form is compact. The airbag module ABM that has been stored is stored in the storage unit 18. A bolt 33 extending from the gas generator 30 and inserted through the airbag 40 is inserted into the side frame portion 15 from the outside of the vehicle, and a nut 34 is fastened to the bolt 33 from the inside of the vehicle. By this tightening, the gas generator 30 is fixed to the side frame portion 15 together with the airbag 40 in an inclined state so as to be located on the rear side toward the upper part.

The gas generator 30 may be fixed to the side frame portion 15 by a member different from the bolt 33 and the nut 34 described above.
As shown in FIG. 1, the side airbag device includes an impact sensor 111 and a control device 112 in addition to the airbag module ABM described above. The impact sensor 111 is composed of an acceleration sensor or the like, and is provided on the side wall portion 11 (see FIG. 2) of the vehicle 10, and detects an impact applied to the side wall portion 11 from the side or obliquely forward. The control device 112 controls the operation of the gas generator 30 based on the detection signal from the impact sensor 111.

  Further, the vehicle 10 is equipped with a seat belt device for restraining the occupant P seated on the vehicle seat 12 to the vehicle seat 12, but in FIG. It is omitted.

  Next, the operation and effect of the present embodiment configured as described above will be described. FIGS. 7A, 8A, and 9A show a state in which the airbag main body 41 is only expanded and not inflated. FIGS. 7B, 8B, and 9B show a state where the airbag main body 41 is deployed and inflated.

  When the impact sensor 111 does not detect that an impact has been applied to the side wall 11, an operation signal for operating the gas generator 30 is not output from the control device 112, and the expansion gas is not ejected. As shown in FIG. 4, the airbag 40 continues to be stored in the storage unit 18 in the storage mode.

  On the other hand, when the vehicle 10 is traveling, an impact of a predetermined value or more is applied to the side wall portion 11 due to a side collision or the like, and when this is detected by the impact sensor 111, gas is generated from the control device 112 based on the detection signal. An operation signal for operating the device 30 is output. In response to this operation signal, the expansion gas is ejected from the gas ejection portion 31a of the inflator 31. The jetted expansion gas is distributed by the first to third inner tubes 72, 81, 86 into an upward direction and a downward direction. There is more inflation gas distributed and going downwards than inflation gas going upwards.

  The gas for expansion that is distributed upward is supplied to the upper rear expansion chamber 103 from the upper ends of the first and second inner tubes 72 and 81 (see FIG. 8A). Due to this expansion gas, the internal pressure of the upper rear expansion chamber 103 rises, and the upper rear expansion chamber 103 starts to expand.

  The expanding gas that is distributed downward is supplied to the first and second check valves 59 and 74 from the lower ends of the first and second inner tubes 72 and 81. During the period in which the expansion gas is supplied to the first and second check valves 59 and 74, the extension parts 56 and 57 and the extension parts 64 and 67, which are valve bodies, are made cylindrical. A force to try is generated. By this force, the first and second check valves 59 and 74 are opened as shown in FIG. Therefore, the expansion gas flows between the extension portions 56 and 64 on the vehicle inner side and the extension portions 57 and 67 on the vehicle outer side and flows into the lower expansion chamber 101. The internal pressure of the lower expansion chamber 101 is increased by the expansion gas, and the lower expansion chamber 101 starts to expand.

  As the expansion gas is continuously supplied from the gas generator 30, the internal pressures of the upper rear expansion chamber 103 and the lower expansion chamber 101 are increased. However, since the expansion gas is supplied to the lower expansion chamber 101 more than the upper rear expansion chamber 103, the internal pressure of the lower expansion chamber 101 becomes higher than the internal pressure of the upper rear expansion chamber 103 in the initial stage of expansion. As the lower expansion chamber 101 and the upper rear expansion chamber 103 expand, as shown in FIGS. 8B and 9B, the horizontal partition portion 50 and the vertical partition portion 60 are pulled to both sides in the vehicle width direction, respectively. It is done.

  As shown in FIG. 5, in the upper expansion chamber, as the upper rear expansion chamber 103 expands, a part of the expansion gas in the upper rear expansion chamber 103 flows into the upper front expansion chamber 102 through the communication portion 73. The upper front expansion chamber 102 starts expanding after the upper rear expansion chamber 103 (see FIG. 7B).

  Each expansion of the lower expansion chamber 101, the upper rear expansion chamber 103, and the upper front expansion chamber 102 is performed in the reverse order of the folded state with the cancellation of the folded state. The seat pad 16 of the seat back 14 is pressed by the airbag 40 that is deployed and inflated in this manner, and the seat pad 16 is broken at the planned breaking portion 21 (see FIG. 4). The airbag main body 41 jumps forward from the seat back 14 through the broken portion with a part of the airbag main body 41 remaining in the storage portion 18.

  After that, the airbag 40 to which the inflation gas is supplied is between the side wall 11 and the upper half of the occupant P seated on the vehicle seat 12 as shown by a two-dot chain line in FIGS. Unfold the folds forward and unfold.

  As shown in FIG. 1, the lower expansion chamber 101 having the highest internal pressure expands and expands on the side of the waist portion PP, which is the site with the highest impact resistance, of the upper half of the occupant P. The upper rear expansion chamber 103 whose internal pressure is increased next to the lower expansion chamber 101 expands and expands on the side of the shoulder PS and the side of the rear half of the chest PT, which have higher impact resistance than the front half of the chest PT. . The upper front expansion chamber 102 having an internal pressure lower than that of the upper rear expansion chamber 103 expands and expands on the side of the front half of the chest PT.

  The upper body of the occupant P (the waist PP, the shoulder PS, and the chest PT) is pressed by the lower expansion chamber 101, the upper rear expansion chamber 103, and the upper front expansion chamber 102 that are expanded with a pressure distribution that matches the above-described impact resistance. Be bound. As a result, the impact from the side transmitted through the side wall portion 11 is alleviated by the lower expansion chamber 101, the upper rear expansion chamber 103, and the upper front expansion chamber 102, and the waist portion PP, the shoulder portion PS, and the chest portion PT are protected. .

  Here, in this embodiment, as shown to Fig.6 (a), a part of front-periphery edge part 45 of the airbag main body 41 inclines so that it may move away from the said axis line L1 to the front of an axial orthogonal direction, so that it may be an upper side. It is comprised by the inclined peripheral part 45a. Therefore, in the front peripheral portion 45, the airbag main body 41 has a front portion in the direction orthogonal to the axis as compared with the prior art in FIG. 6B in which the portion 121a corresponding to the inclined peripheral portion 45a is parallel to the axis L1. Expand to. Further, due to the inclination of the above aspect, the distance from the axis L1 to the inclined peripheral edge 45a in the direction perpendicular to the axis becomes longer at the upper part than at the lower part.

  The front end 50a of the horizontal partition 50 is located below the inclined peripheral edge 45a. On the other hand, the upper part is in the vertical section 60 that is inclined so as to move away from the axis L1 in the direction orthogonal to the axis, and the upper front end 60a is more than the inclined peripheral part 45a of the front peripheral part 45. Located on the upper side.

  Therefore, the distance D1 from the axis L1 to the upper front end 60a in the direction perpendicular to the axis is longer than the distance D2 from the coaxial line L1 to the front end 50a. Along with this, the upper rear expansion chamber 103 expands forward in the direction perpendicular to the axis, as compared with the prior art of FIG. 6B in which the distance D1 is set shorter than the distance D2.

  Accordingly, the vehicle seat 12 having a sufficiently low rigidity is attached to the floor portion of the vehicle body as shown by the two-dot chain line arrow in FIG. 1 and FIG. The upper rear expansion chamber 103 is interposed between the shoulder portion PS of the occupant P and the side wall portion 11 even if the deformation is performed in the mode of rotating as a fulcrum. Note that the phenomenon in which force is applied from diagonally forward can occur not only when an impact is applied to the side wall portion 11 from diagonally forward but also when an impact is applied from the side. The shoulder PS can be protected from an impact transmitted through the side wall 11 by the upper rear expansion chamber 103 enlarged as described above.

  In the prior art shown in FIG. 6B, if the upper rear expansion chamber 126 expands and expands at a position shifted rearward from the side of the shoulder portion PS, the shoulder portion PS does not pass through the shoulder portion PS. There is a risk that the rear half of the chest PT having lower impact resistance may be directly pushed by the upper rear expansion chamber 126. However, in the present embodiment shown in FIG. 6A in which the upper rear expansion chamber 103 expanded forward expands and expands on the side of the shoulder PS, the shoulder has higher impact resistance than the rear half of the chest PT. It is difficult for the portion PS to be pushed directly by the upper rear expansion chamber 103 and the chest PT to be pushed directly. Therefore, in addition to the shoulder portion PS, the latter half portion of the chest PT can be appropriately protected from impact.

  Further, the vertical distance C1 in the present embodiment (FIG. 6A) in which the distance D1 is longer than the distance D2 is the vertical distance in the related art (FIG. 6B) in which the distance D1 is shorter than the distance D2. Same or equivalent to C2. Here, it is assumed that the upper and lower positions of the front end 50a of the horizontal partition 50 in the present embodiment and the front end 122a of the horizontal partition 122 in the prior art are the same. Then, when the upper rear expansion chambers 103 and 126 are expanded and expanded, the vertical position of the upper front end portion 60a of the vertical partition section 60 and the vertical position of the upper front end section 124b of the vertical partition section 124 are the same or equivalent. Become. Therefore, the upper rear expansion chamber 103 of this embodiment having a long distance D1 is expanded forward in the direction perpendicular to the axis at the same or equivalent vertical position as the upper rear expansion chamber 126 of the prior art having the short distance D1. Become. As a result, the performance of protecting the shoulder PS due to the change in the vertical position of the upper rear expansion chamber 103 hardly occurs.

Furthermore, when the curved portion 68a is curved with a small radius, stress due to the pressure of the inflation gas tends to concentrate on the curved portion 68a, which may cause a reduction in strength.
In this regard, in this embodiment (FIG. 6A), the radius R1 of the curved portion 68a is set to be larger than the radius R2 of the curved portion 124a in the conventional technique (FIG. 6B), so that the inflation gas The stress acting on the curved portion 68a is dispersed by the pressure of. The curved portion 68a exhibits a high strength necessary for proper deployment without causing damage or the like.

  By the way, when the ejection of the expansion gas from the inflator 31 stops and the expansion gas in the lower expansion chamber 101 tries to flow toward the upper rear expansion chamber 103, as shown in FIG. The extended portions 56 and 64 and the extended portions 57 and 67 on the outside of the vehicle are pressed by the high pressure in the lower expansion chamber 101 and come into contact with each other. Both the first and second check valves 59 and 74 are closed, and the expansion gas in the lower expansion chamber 101 is supplied to the extension portions 56 and 64 on the vehicle inner side and the extension portions 57 and 67 on the vehicle outer side. Outflow (back flow) to the upper rear expansion chamber 103 through the space is restricted. Therefore, the internal pressure of the lower expansion chamber 101, which has been increased to an appropriate internal pressure (internal pressure higher than that of the upper rear expansion chamber 103) to protect the occupant P's lower back PP, is prevented from decreasing due to the backflow.

  As shown in FIG. 5, surplus inflation gas in the lower inflation chamber 101 is discharged to the front lower side of the airbag 40 through the exhaust hole 95. Due to this discharge, when the occupant P is restrained by the airbag 40, the internal pressure of the lower expansion chamber 101 is lowered, and the waist portion PP of the occupant P is pressed with an appropriate pressing force.

According to the present embodiment, the following effects can be obtained in addition to the above.
When the curved portion 68a is curved with a small radius, it is difficult to sew the vertical partition 60 to the airbag body 41 with a sewing machine. However, by setting the radius R1 of the curved portion 68a to be larger than the radius R2 of the curved portion 124a as described above, the curved portion 68a changes gradually, and the suturing operation is facilitated.

  In FIG. 10 (c), when the vertical partition 60 and the first inner tube 72 are formed by separate pieces of cloth, the operation of connecting the first inner tube 72 to the vertical partition 60 after their formation is performed. Necessary. However, in this embodiment, since the vertical partition part 60 and the 1st inner tube 72 are comprised by the common cloth piece, such a joint operation becomes unnecessary.

In addition, the said embodiment can also be implemented as a modification which changed this as follows.
The gas generator 30 may be configured by only the inflator 31 having the bolt 33 without using the retainer 32.

  The airbag main body 41 may be substantially entirely composed of the inflatable portion 49 as in the above embodiment, but has a non-inflatable portion that does not inflate without being supplied with the inflation gas. It may be a thing.

  A portion of the upper body of the occupant P that is restrained and protected by the upper rear expansion chamber 103 and the upper front expansion chamber 102 is expanded and expanded at least on the side of the shoulder portion PS, so that the shoulder portion PS is It may be changed to a part different from the above embodiment on the condition that it is restrained and protected.

  For example, the upper rear expansion chamber 103 may be expanded and expanded on the side of the shoulder PS and the chest PT, and the upper front expansion chamber 102 may be expanded and expanded on the side of the space in front of the chest PT. In this case, the upper front expansion chamber 102 may receive a function of adjusting the internal pressure of the upper rear expansion chamber 103 by receiving the expansion gas flowing out from the upper rear expansion chamber 103.

  -As the vertical division part 60, what has a shape different from the said embodiment may be used. In this case, it is desirable that the shape of the vertical section 60 is changed in accordance with the portion of the upper body of the occupant P that is desired to be restrained and protected by the upper rear expansion chamber 103.

-Any one of the 1st-3rd inner tubes 72, 81, 86 may be omitted, and it may be changed from a triple cylinder shape to a double cylinder shape, and two may be omitted.
The check valve may be configured by only one of the first check valve 59 and the second check valve 74.

-The vertical division part 60 and the 1st inner tube 72 may be formed with a separate cloth piece.
In the above embodiment, a pressure regulating valve that adjusts the internal pressures of the upper rear expansion chamber 103 and the upper front expansion chamber 102 by adjusting the degree of opening of the communication portion 73 may be provided.

-Vehicles to which the side airbag device is applied include not only private vehicles but also various industrial vehicles.
The technical ideas that can be grasped from each of the above embodiments will be described below together with the effects thereof.

(A) In the side airbag device according to claim 5, the inner tube is constituted by a piece of cloth common to the vertical partition portion.
In the case where the inner tube and the vertical section are formed by separate cloth pieces, it is necessary to join the inner tube to the vertical section after their formation. However, according to said structure, since an inner tube and a vertical division part are comprised with the common cloth piece, such a joint operation becomes unnecessary.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Side wall part, 12 ... Vehicle seat, 14 ... Seat back, 18 ... Storage part, 30 ... Gas generator, 41 ... Airbag main body, 43, 44 ... Main body cloth part, 45 ... Front peripheral part 45a ... inclined peripheral edge part, 50 ... horizontal partition part, 50a ... front end part, 60 ... vertical partition part, 60a ... upper front end part, 68 ... upper front vertical joint part (upper vertical joint part), 68a ... curved part, 72 ... 1st inner tube (inner tube), 73 ... Communication part, 74 ... 2nd check valve (check valve), 101 ... Lower expansion chamber, 102 ... Upper front expansion chamber, 103 ... Upper rear expansion chamber, C1, C2: Vertical distance, D1, D2: Distance, L1: Axis, P: Crew, PS: Shoulder, R1, R2 ... Radius.

Claims (5)

A long gas generator incorporated in a storage portion in a side portion outside the vehicle in a seat back of a vehicle seat; and the expansion gas that is incorporated in the storage portion and supplied from the gas generator; An airbag main body that comes out of the seat back in a state where a part of itself is left in the storage portion, and is deployed and inflated forward between an occupant seated on the vehicle seat and a side wall portion of the vehicle. And
The airbag body is partitioned into a lower expansion chamber and a lower expansion chamber below the upper expansion chamber and the same expansion chamber by a horizontal partition portion,
The upper expansion chamber is partitioned by a vertical partition into an upper rear expansion chamber that expands and expands at least on the side of the shoulder of the occupant, and an upper front expansion chamber on the front side of the upper rear expansion chamber. ,
The upper part of the vertical section is inclined so as to move away from the axis of the gas generator toward the front in the direction perpendicular to the axis orthogonal to the coaxial line along the side wall,
The side airbag device in which a distance from the axis in the axis orthogonal direction to the upper front end of the vertical partition is set longer than a distance from the coaxial line to the front end of the horizontal partition. The front peripheral portion constituting the front side portion of the peripheral portion of the airbag body has in part an inclined peripheral portion that inclines so as to move away from the axis to the front in the direction perpendicular to the axis.
The front end portion of the horizontal partition portion is located below the inclined peripheral edge portion of the front peripheral edge portion,
2. The side airbag device according to claim 1, wherein the upper front end portion of the vertical partition portion is positioned above the inclined peripheral edge portion of the front peripheral edge portion. When the interval between the front end portion of the horizontal partition portion and the upper front end portion of the vertical partition portion in the direction along the axis is defined as a vertical interval,
The vertical distance when the distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical partition is longer than the distance from the coaxial line to the front end of the horizontal partition is the case where the vertical distance is short. The side airbag device according to claim 2, wherein the side airbag device is set to be equal to or equal to the vertical distance. The airbag body includes a main body cloth portion on the inner side of the vehicle and a main body cloth portion on the outer side of the vehicle,
The vertical partition portion is disposed above the horizontal partition portion between both main body fabric portions,
Each of the peripheral parts on the vehicle inner side and the vehicle outer side of the vertical partition part is connected to the adjacent main body cloth part by an upper vertical connecting part,
The upper part of each upper vertical coupling part is inclined so that the upper side is farther away from the axis in the direction orthogonal to the axis, and the lower part of each upper vertical coupling part extends along the axis.
A boundary portion between the upper portion and the lower portion of each upper vertical coupling portion is configured by a curved portion that curves so as to swell rearward.
The curved portion when the distance from the axis in the direction perpendicular to the axis to the upper front end of the vertical partition is longer than the distance from the coaxial line to the front end of the horizontal partition is The side airbag device according to claim 3, wherein the side airbag device is curved with a radius larger than that of the curved portion.   In the airbag main body, the expansion gas from the gas generator is rectified so as to go to the upper rear expansion chamber and the lower expansion chamber, and is expanded from the lower expansion chamber to the upper rear expansion chamber. An inner tube having a check valve for restricting the flow of the working gas is provided at the lower portion, and a communicating portion for communicating the upper rear expansion chamber and the upper front expansion chamber is provided in the vertical partition portion. The side airbag device according to any one of claims 1 to 4.