JP2014046752A - Side airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side airbag device capable of protecting an occupant properly using portions having high resistance to a load in the body.SOLUTION: An airbag 40 is expanded and inflated to the front on a lateral side of an occupant P by inflation gas supplied according to shock applied from a side of a vehicle seat 12. The airbag 40 is partitioned into a rear side inflation section 47 expanded and inflated on a rear side by supply of inflation gas to the inside and a front side inflation section expanded and inflated on a front side with respect to the rear side inflation section 47 by inflow of inflation gas from the rear side inflation section 47, and includes a communication section allowing inflow of inflation gas from the rear side inflation section 47 to the front side inflation section while limiting the inflow amount. The rear side inflation section 47 expands and inflates so as to press portions including a scapula PSB in a back section PB and a side belly section of the occupant P from an oblique rear side of the occupant P.

Description

  The present invention relates to a side airbag device that deploys and inflates an airbag on the side of an occupant seated in a vehicle seat.

  2. Description of the Related Art A side airbag device is known as a device that protects an occupant from an impact caused by a side impact on a body side portion such as a side door of a vehicle. The apparatus includes an inflator that ejects an inflating gas in response to a side collision of the vehicle, and an airbag that contains the inflator and is inflated and inflated by the inflating gas supplied from the inflator. The airbag and the inflator are accommodated in a lateral vicinity of an occupant seated in the vehicle seat, for example, a storage portion outside the vehicle in a seat back (backrest portion).

  In the side airbag device, when a side impact is applied to the body side portion due to a side collision, inflation gas is ejected from the inflator and supplied into the airbag. The airbag is deployed and inflated by the inflation gas, breaks the seat back, and jumps forward. The airbag passes through a narrow gap between the occupant seated on the vehicle seat and the body side portion, and is deployed and inflated to a size and shape that can protect the occupant. By this airbag, the impact from the side transmitted to the occupant through the body side portion is mitigated.

  As such a side airbag device, for example, a device described in Patent Document 1 is known. In this apparatus, the airbag includes a high pressure bag having a high internal pressure and a low pressure bag having a relatively low internal pressure. The high-pressure bag is deployed and inflated on the rear side of the occupant side, and the low-pressure bag is deployed and inflated on the front side of the occupant side.

  In this device, the occupant is moved away from the body side portion to which the impact is applied by pressing the rear side portion having high resistance to the load among the side portions of the occupant with the high pressure bag. Moreover, the front part of a passenger | crew side is protected by restraining the front part of the passenger | crew side part with the said comparatively low tolerance with a low voltage | pressure bag. As described above, in the above-described apparatus, when the occupant is protected by the airbag, a portion on the rear side that is highly resistant to the load is actively used among the occupant side portions.

JP 2008-201172 A

  By the way, the resistance to the load on the occupant's body varies among the parts on the rear side of the occupant side, and the shoulder having the scapula has high resistance while the flank has relatively low resistance.

  In the side airbag device, the airbag presses the occupant from the side. Therefore, if the rear side portion of the passenger side is simply pressed by the high-pressure bag as described above, both the shoulder portion and the flank portion are pressed by the high-pressure bag. Therefore, it must be set according to the resistance of the flank portion having low resistance.

This is one of the factors that hinder the appropriate realization of the occupant in a suitable protection using a portion having high resistance to load in the body.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a side airbag device capable of protecting an occupant by suitably using a portion having high resistance to load in the body. is there.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, the airbag stored in the storage portion near the side of the occupant seated on the vehicle seat is supplied by the inflation gas supplied in response to the impact applied from the side of the vehicle seat. A side airbag device that is deployed and inflated forward on the side of the occupant, wherein the airbag is rearward of a rear side inflating portion that is supplied with the inflation gas and is deployed and inflated on the rear side. The expansion gas is partitioned into a front side expansion part that expands and expands in front of the rear side expansion part by the inflow of the expansion gas from the side expansion part, and the rear side expansion part to the front side expansion part In the side airbag device having a communication portion that allows the inflow of the inflation gas while restricting the inflow amount, the rear-side inflatable portion carries the portion including the scapula and the flank on the back of the occupant. As its gist that is inflated and deployed in a manner which presses the obliquely from the rear.

  In the above apparatus, when an impact due to a collision or the like is applied from the side of the vehicle seat, first, inflation gas is supplied to the rear-side inflating portion of the airbag, and the rear-side inflating portion starts to inflate. And the front side expansion part expands and expands by the expansion gas flowing in while restricting the amount of flow from the rear side expansion part to the front side expansion part via the communication part. Therefore, when the airbag is deployed and inflated, the rear-side inflated portion is deployed and inflated prior to the deployment of the front-side inflated portion, and the internal pressure in the rear-side inflated portion is higher than the internal pressure in the front-side inflated chamber.

  Here, as a result of the analysis by the inventors, even when a load is applied to the occupant's flank, the load is applied to the occupant from the rear side as compared with the case where the load is applied from the side of the occupant. It was found that the resistance to the load is remarkably increased.

  In the above apparatus, when the airbag is deployed and inflated forward on the side of the occupant, the rear side inflatable portion with high internal pressure causes the portion including the scapula and the flank on the occupant's back from the diagonally rear of the occupant. Pressed. At this time, although the load on the flank portion of the occupant is also applied with the load on the flank portion, the same load can be applied in a manner having higher resistance to the occupant compared to the case where the load is applied to the flank portion from the side. . Thus, according to the said apparatus, in the expansion | deployment expansion | swelling of a back side expansion | swelling part, the part with high tolerance with respect to a load can be pressed in the aspect which becomes the same tolerance high among a passenger | crew side parts. Therefore, it becomes possible to set the internal pressure of the rear side inflating portion to a high pressure, and the occupant is preferably moved in the direction in which the protection is ensured by the rear side inflating portion (for example, the direction to move to the inside of the vehicle). It becomes possible. Moreover, in the above apparatus, the front side inflating part expands and inflates in front of the rear side inflating part, and therefore the front side inflating part, that is, the front side part in the occupant side part is suitably protected by the low internal pressure part. Can do. Therefore, according to the said apparatus, a passenger | crew protection can be aimed at suitably using the part with high tolerance with respect to a load among bodies.

  According to a second aspect of the present invention, in the side airbag device according to the first aspect of the present invention, the communication portion is configured to move the communication portion from the rear-side inflating portion to the front-side inflating portion before restraint by the rear-side inflating portion. The gist is to restrict the inflow of the inflation gas and to release the restriction when the occupant is restrained by the rear-side inflating portion.

  According to the above-described device, first, when the airbag is deployed and inflated, the rear-side inflatable portion can be quickly inflated and inflated, so that the occupant is moved away from the airbag deployment position by pressing by the rear-side inflatable portion. Can be made. Then, the front side expansion portion can be expanded and expanded thereafter. Therefore, the airbag can be deployed and inflated while ensuring a space for deploying and inflating the airbag.

  According to a third aspect of the present invention, in the side airbag device according to the first or second aspect, the device has a boundary between the rear-side inflating portion and the front-side inflating portion that is the inflating and inflating of the airbag. The gist is that it is set at the center in the front-rear direction on the side of the occupant when completed.

  According to the above configuration, the rear side inflatable portion can be deployed and inflated on the rear side of the occupant side portion, and therefore, the configuration in which the occupant's back is pressed obliquely from the rear side by the rear side inflatable portion can be easily realized. Can do. And since the front side expansion | swelling part can be expand | deployed and expanded in the front side in a passenger | crew side part, the front side part in the passenger | crew side part by the front side expansion | swelling part can be protected suitably.

  ADVANTAGE OF THE INVENTION According to this invention, passenger | crew protection can be aimed at suitably using the part with high tolerance with respect to a load among bodies.

In one Embodiment which actualized this invention, the side view which shows the vehicle seat provided with the side airbag apparatus with a passenger | crew. In one embodiment, the plane sectional view showing the positional relation of a vehicular seat, a crew member, and a body side part. In one embodiment, the fragmentary plane sectional view showing the air bag module built in the storage part of the seat back. The side view which shows the airbag module by which the airbag was made into the non-expanding deployment state in one Embodiment. The partial expanded sectional view which shows typically sectional structure, such as a division member along the AA line of FIG. It is a figure which shows one Embodiment, and the fragmentary perspective view which shows the state seen from the upstream about the part near the pressure regulation valve in a division member. (A) is a partial side sectional view showing the airbag module together with the occupant, in which the airbag in the non-inflated and deployed state in FIG. 4 is cut at the center in the vehicle width direction, and (B) is a U portion in (A). The partial sectional side view shown expanded. Sectional drawing which shows the state seen from the upstream about the internal structure of the airbag module which the airbag of one Embodiment expand | deployed and the division member was tense. It is a figure corresponding to FIG. 1, and the side view which shows the state which both the upper protection expansion part and the lower protection expansion part expand | deployed. It is a figure corresponding to FIG. 2, and the plane sectional view which shows the state which both the back side expansion part and the front side expansion part expand | deployed and expanded. (A)-(C) is a mimetic diagram showing operation of a pressure regulation valve in one embodiment. It is a figure corresponding to Drawing 2, and a plane sectional view showing the state where only the back side expansion part developed and expanded.

Hereinafter, an embodiment in which the present invention is embodied in a side airbag device applied to a vehicle 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 width direction (vehicle width direction) of the vehicle as a reference, the side approaching the center is defined as “vehicle inside”, and the side away from the center is defined as “vehicle outside”.

Further, the present embodiment is based on the premise that an occupant (adult) having a standard physique is seated on a vehicle seat in a standard posture.
As shown in FIGS. 1 and 2, a vehicle seat 12 is disposed in the vicinity of the vehicle inner side (upper side in FIG. 2) of the body side portion 11 in the vehicle 10. Here, the body side part 11 refers to a vehicle constituent member arranged on the side part of the vehicle 10, and mainly corresponds to a door, a pillar, and the like. For example, the body side part 11 corresponding to the front seat is a front door, a center pillar (B pillar), or the like. The body side 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 (seat portion) 13 and a seat back (backrest) 14 that stands up from the rear side of the seat cushion 13 and whose inclination angle is adjusted by an inclination adjustment mechanism (not shown). ing. The vehicle seat 12 is disposed on the vehicle 10 with the seat back 14 facing forward. The width direction of the vehicle seat 12 arranged in this way matches the vehicle width direction.

  The seat back 14 includes a seat back main body 22 and a pair of side support portions 23 provided on both sides in the width direction of the seat back main body 22. The seat back body 22 is inclined rearward and supports the upper body of the occupant P from the rear side. Both side support portions 23 protrude forward from the seat back body 22 and restrict the movement of the upper body of the occupant P seated on the seat cushion 13 in the vehicle width direction.

Next, in the seat back 14, the internal structure of the vehicle outer side portion including the vehicle outer side support portion 23 will be described.
A seat frame that forms the skeleton is disposed in the seat back 14. As shown in FIG. 3, a part of the seat frame is disposed on the vehicle outer side (lower side in FIG. 3) in the seat back 14, and this part (hereinafter referred to as “side frame part 15”) is made of metal. It is formed by bending a plate. 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. The seat pad 16 is covered with a skin, but 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. The position of the storage portion 18 is in the vicinity of the rear of the occupant P seated on the vehicle seat 12 (see FIG. 2). An air bag module AM that forms the main part of the side air bag device is incorporated in the storage portion 18.

The airbag module AM incorporated in the seat back 14 includes an inflator assembly 30 and an airbag 40 as main components.
Next, each of these structural members will be described. Here, in the present embodiment, when the airbag module AM and its constituent members are referred to as “vertical direction” and “front-rear direction”, as shown in FIG. 1, the seat back 14 of the vehicle seat 12 is used as a reference. The direction in which the seat back 14 stands is the “vertical direction” of the airbag module AM or the like, and the thickness direction of the seat back 14 is the “front-rear direction” of the airbag module AM or the like. As described above, since the seat back 14 is normally used in a state of being slightly inclined rearward, the “vertical direction” of the airbag module AM or the like strictly matches the vertical direction (vertical direction) of the vehicle 10. I'm not doing it, it's a little inclined. Similarly, the “front-rear direction” of the airbag module AM or the like does not match the front-rear direction (horizontal direction) of the vehicle 10 and is slightly inclined.

<Inflator assembly 30>
As shown in FIGS. 3 and 4, the inflator assembly 30 includes an inflator 31 as a gas generation source and a retainer 32 attached to the outside of the inflator 31. In the present embodiment, a type called a pyro type is employed as the inflator 31. The inflator 31 has a substantially cylindrical shape, and a gas generating agent (not shown) that generates the expansion gas G is accommodated therein. A harness (not shown) serving as an input wiring for an operation signal to the inflator 31 is connected to one end (the lower end in the present embodiment) of the inflator 31 in the length direction.

  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 that functions as a diffuser and has a function of fastening the inflator 31 to the side frame portion 15 together with the airbag 40. Most of the retainer 32 is formed in a substantially cylindrical shape by bending a plate material such as a metal plate. The retainer 32 is provided with a window 33, and most of the inflation gas G ejected from the inflator 31 is ejected to the outside of the retainer 32 through the window 33.

  A plurality of bolts 34 for fixing the retainer 32 to the side frame portion 15 are fixed to the retainer 32. In other words, the plurality of bolts 34 are indirectly fixed to the inflator 31 via the retainer 32. The inflator assembly 30 may be one in which the inflator 31 and the retainer 32 are integrated.

<Airbag 40>
As shown in FIGS. 9 and 10, when the airbag 40 is subjected to an impact on the vehicle 10 (the body side portion 11) from the side of the vehicle seat 12 due to a side collision or the like while the vehicle 10 is running, The supply of the expansion gas G is received from the inflator 31. The airbag 40 is deployed and inflated substantially forward from the seat back 14 with a part of the airbag 40 left in the storage portion 18. The airbag 40 is deployed and inflated between a location close to the occupant P seated on the vehicle seat 12, here, the upper body of the occupant P and the body side portion 11, thereby causing the occupant P from the impact of the side collision. Protect many parts of the upper body.

  FIG. 4 shows the airbag module AM in a state where the airbag 40 is deployed in a plane without being filled with the inflation gas G (hereinafter referred to as “non-inflated and deployed state”). 7 shows the airbag module AM in which the airbag 40 in the non-inflated and deployed state in FIG. 4 is cut at the center in the vehicle width direction together with the occupant P in order to show the internal structure of the airbag module AM. Yes.

  As shown in FIGS. 4 and 7, the airbag 40 is a vehicle in which a single piece of cloth 41 (also called a base cloth, panel cloth, etc.) is folded in two along a fold line 42 set at the center thereof. It is formed by overlapping in the width direction and joining the overlapped portions in a bag shape. Here, in order to distinguish the two overlapped portions of the airbag 40, the one located on the inside of the vehicle is referred to as the cloth portion 43 (see FIG. 7), and the one located on the outside of the vehicle is referred to as the cloth portion 44 ( (See FIG. 4).

  In the present embodiment, the cloth piece 41 is folded in two so that the fold line 42 is positioned at the rear end of the airbag 40, but the fold line 42 has other ends such as a front end, an upper end, The cloth piece 41 may be folded in half so as to be positioned at the lower end or the like. The airbag 40 may be composed of two pieces of cloth divided along the fold line 42. In this case, the airbag 40 is formed by superimposing two pieces of cloth in the vehicle width direction and connecting the two pieces of cloth so as to form a bag shape. Further, the airbag 40 may be composed of three or more pieces of cloth.

  In the airbag 40, the outer shapes of the cloth portions 43 and 44 are in a line-symmetric relationship with each other with the folding line 42 as the axis of symmetry. The shape and size of each of the cloth portions 43 and 44 is that many of the upper body of the occupant P seated on the vehicle seat 12 when the airbag 40 is deployed and inflated between the vehicle seat 12 and the body side portion 11. It is set so as to be able to occupy a region corresponding to this part (part from the waist PP to the chest PT and shoulder PS).

  As the cloth parts 43 and 44, a woven cloth formed using a material having high strength and flexibility and can be easily folded, for example, polyester yarn, polyamide yarn or the like is suitable.

  The above-described connection between the cloth parts 43 and 44 is performed at a peripheral connection part 45 provided at the peripheral part thereof. In the present embodiment, the peripheral edge coupling portion 45 is formed by sewing (sewing with a sewing thread) a portion of the peripheral edge portions of the cloth portions 43 and 44 excluding the rear end portion (the vicinity of the folding line 42). ing. This also applies to the outer coupling portions 54 and 55 and the inner coupling portion 63 described later.

  Regarding the above-described sewing, in FIGS. 4 and 6 to 8, a sewing portion is expressed by two line types. One line type is a line (a kind of broken line) expressed by arranging thick lines of a certain length intermittently (this is a kind of broken line), which is outside the cloth parts 43 and 44 to be stitched (between the cloth parts 43 and 44). No) is shown (see FIG. 4 etc.). The other line type is a line (a type of broken line) in which points are arranged at regular intervals, and this indicates the state of the sewing thread between the cloth portions 43 and 44 to be sewn (in FIG. 7). Refer to the peripheral joint 45). That is, the drawing in which the sewing is expressed in the latter manner shows a cross-sectional structure along a cross section passing through the sewing portion.

  As shown in FIGS. 4 and 7, the space between the cloth portions 43 and 44 and surrounded by the peripheral edge coupling portion 45 is expanded and expanded on the side of the upper body of the occupant P by the inflation gas G. It is an inflating part for restraining many parts of the upper body and protecting them from impact.

  In addition, the periphery coupling | bond part 45 may be formed by the means different from the sewing using the said sewing thread, for example, adhesion | attachment using an adhesive agent. This also applies to the outer coupling portions 54 and 55 and the inner coupling portion 63 described later.

  The inflator assembly 30 is disposed at the rear end portion in the airbag 40 in a posture that is inclined so as to become lower toward the front side. And the bolt 34 of the retainer 32 is penetrated by the cloth part 43 inside a vehicle (refer FIG. 3). By such insertion, the inflator assembly 30 is locked in a state of being positioned with respect to the airbag 40.

The inflatable portion of the airbag 40 is partitioned into a plurality of portions by a planar partition member 50. The partition member 50 has the same configuration as that generally called a tether.
FIG. 5 shows a cross-sectional structure along the line AA in FIG. In FIG. 5, each member is drawn with the thickness omitted, and each inner coupling portion 63 is drawn in a zigzag shape. As shown in FIGS. 5 and 7, when the airbag 40 is in a non-inflated and deployed state, the partition member 50 is folded back along a folding line 51 extending in the up-down direction, so that opposing opposing ends. 52 and 53 are made close to each other. The two-folded partition member 50 is disposed in the inflating portion in a state in which the folding line 51 is positioned on the upstream side (side closer to the inflator 31) than the opposing end portions 52 and 53.

  As shown in FIGS. 6 and 8, the partition member 50 has a length L <b> 1 in a direction along the fold line 51 (hereinafter, referred to as “vertical direction”) when being tensioned in a planar shape with the expansion and expansion of the expansion portion. However, it has a shape longer than the length L2 in the direction orthogonal to the folding line 51 (hereinafter referred to as “lateral direction”). The partition member 50 is coupled to the cloth portions 43 and 44 of the airbag 40 by outer coupling portions 54 and 55 extending in the vertical direction at the opposed end portions 52 and 53.

  The partition member 50 is bridged between the cloth part 43 on the vehicle inner side and the cloth part 44 on the vehicle outer side by the above-described coupling. The partition member 50 is folded in two when the airbag 40 is in a non-inflated and deployed state (see FIGS. 5 and 7). Moreover, when the expansion part expand | deploys and expands, the division member 50 will be in the state tensed in the width direction (vehicle width direction) of the vehicle seat 12 (see FIGS. 6 and 8), and the thickness of the expansion part in the same direction. To regulate. Further, as shown in FIGS. 9 and 10, the portion where the partition member 50 is arranged inside the upper protective inflating portion 46 is substantially the front-rear direction at the side portion of the occupant P when the inflating portion is completely expanded. It is formed at a position in contact with the center.

  Further, the two-folded partition member 50 is coupled to the airbag 40 at both ends in the direction along the fold line 51. That is, the upper end portion and the lower end portion of the partition member 50 are coupled (sewed together) to the upper end portion and the lower end portion of the both cloth portions 43 and 44 of the airbag 40 by the above-described peripheral edge coupling portion 45 (see FIG. 7). .

  As shown in FIGS. 4 and 7, the inflating part is mainly composed of an upper protective inflating part 46 and a lower protective inflating part 49. The upper protective inflating portion 46 breaks the seat back 14 and jumps forward, and expands and inflates on the upper side of the upper half of the occupant P.

  The upper protective expansion part 46 is divided into a rear side expansion part 47 and a front side expansion part 48 by the partition member 50. The rear side inflating portion 47 expands and inflates at the rear side portion of the upper portion of the upper body of the occupant P. In the present embodiment, the posterior inflatable portion 47 includes a portion including the scapula PSB and the flank PR in the back portion PB of the occupant P (specifically, the flank PR from the scapula PSB in the obliquely posterior portion of the back portion PB). Is formed in a shape that expands and expands in such a manner that the occupant P is pressed obliquely from behind. On the other hand, the front side inflating part 48 expands and inflates at a front side part (a part including the chest PT) in the upper part of the upper half of the occupant P.

  The lower protective inflating portion 49 is provided in communication with the lower side of the upper protective inflating portion 46 (mainly the rear side inflating portion 47), and expands and inflates on the rear side of the lower part of the upper body of the occupant P. The lower part of the upper body includes a waist PP.

  In the present embodiment, the partition member 50 is provided not only in the upper protective expansion portion 46 but also in the lower protective expansion portion 49. However, in the lower protective expansion portion 49, the partition member 50 is provided at a location near the front end of the lower protective expansion portion 49. Therefore, the lower protective inflating part 49 is in a state that is substantially not partitioned. In other words, the partition member 50 is in the same state as that provided only in the upper protective inflating portion 46, as indicated by a two-dot chain line in FIG. In this case, as shown in FIG. 8, when the length in the vertical direction of the partition member 50 in the upper protective expansion portion 46 is L1 ′, the length L1 ′ is shorter than the length L1 described above. However, since the upper protective expansion portion 46 expands vertically, the length L1 ′ is still longer than the lateral length L2.

  As shown in FIGS. 4 and 7, the inflator assembly 30 is disposed at any location inside the rear side expansion portion 47 and the lower protection expansion portion 49. With such a configuration, in the upper protective expansion portion 46, the expansion gas G from the inflator 31 is first supplied to the rear side expansion portion 47. The expansion gas G that has passed through the rear side expansion part 47 is then supplied to the front side expansion part 48 adjacent to the front side of the rear side expansion part 47.

  As shown in FIGS. 6 and 8, the partition member 50 includes two members 56 and 57 arranged in a vertical direction (vertical direction) that is a direction along the fold line 51. The members 56 and 57 are formed in a sheet shape using the same material as the cloth portions 43 and 44 of the airbag 40.

  In the upper and lower members 56, 57, the end portions 58, 59 are overlapped in a band shape with the end edges 58E, 59E of the end portions 58, 59 being matched. The upper and lower members 56 and 57 are each in a direction (horizontal) perpendicular to the fold line 51 at a boundary portion between a pair of overlapping portions 61 each having a belt shape and other portions (hereinafter referred to as “non-overlapping portions 62”). Are coupled by an inner coupling portion 63 extending in the direction). This boundary portion is separated from the end edges 58E and 59E by a certain distance downward.

  In the partition member 50, an intermediate portion in the vertical direction and a substantially central portion in the horizontal direction are expanded from the rear side expansion portion 47 to the front side expansion according to the restraint state of the occupant P by the rear side expansion portion 47. A pressure regulating valve 70 is provided as a valve for regulating and releasing the regulation of the flow of the expansion gas G to the part 48. In the present embodiment, the pressure regulating valve 70 functions as a communication part.

  Next, the configuration of the pressure regulating valve 70 will be described. The coupling of the inner coupling portion 63 is released at a part thereof (a portion straddling the folding line 51 in the present embodiment). In other words, the inner coupling portion 63 that couples the upper and lower members 56 and 57 is not provided in a portion straddling the folding line 51 at the boundary portion between the overlapping portion 61 and the non-overlapping portion 62. In this way, the portion where the inner coupling portion 63 is not provided, where the coupling is released, extends in the lateral direction (vehicle width direction), and allows the rear side expansion portion 47 and the front side expansion portion 48 to communicate with each other. An inner opening 71 composed of a slit is formed. Here, the lateral direction (vehicle width direction) is the same as the direction in which an impact is applied to the vehicle 10.

  A portion (proximal portion) corresponding to the inner opening 71 in the overlapping portion 61 constitutes a pair of valve body portions 73 and 74. More precisely, a valve body 73 is constituted by a portion between the inner opening 71 and the end edge 58E, and a valve body 74 is constituted by a portion between the inner opening 71 and the end edge 59E. Yes. Both valve body parts 73 and 74 contact each other in at least a part of them, for example, the front end parts 73T and 74T, so that the pressure regulating valve 70 is closed, and the inner opening 71 or between both valve body parts 73 and 74 is closed. The flow of the expansion gas G at the bottom is regulated (see FIGS. 11A and 11B). Further, when the inner opening 71 is opened and the entire valve body 73 is separated from the entire valve body 74, the pressure regulating valve 70 is opened, and the inner opening 71 and both valve bodies 73 and 74 are opened. The above distribution restriction of the expansion gas G is released (circulation is allowed) (see FIG. 11C).

Furthermore, as described above, the two overlapping portions 61 having both the valve body portions 73 and 74 are disposed in the rear side expansion portion 47 before the expansion portion is deployed and expanded.
The overlapping portions 61 are folded upward or downward (upward in the present embodiment) at the boundary portion with the non-overlapping portion 62 and overlapped with the non-overlapping portion 62. Furthermore, the folded band-shaped overlapping portions 61 correspond to the airbag 40 at the both ends in the direction along the inner coupling portion 63 (lateral direction: vehicle width direction) by the outer coupling portions 54 and 55 described above. The cloth portions 43 and 44 and the non-overlapping portion 62 of the partition member 50 are coupled (co-sewn) (see FIGS. 5, 7 </ b> A, and 7 </ b> B).

  As shown in FIG. 3, the airbag module AM is formed into a compact form (hereinafter referred to as “storage form”) by folding the airbag 40 (see FIGS. 4 and 7) in a non-inflated and deployed state. ing. This is because the airbag module AM is suitable for storage with respect to the storage unit 18 having a limited size in the seat back 14.

  The airbag module AM in the storage form is disposed in the storage portion 18 with the inflator assembly 30 positioned on the rear side and most of the airbag 40 positioned on the front side. As described above, the bolt 34 that extends from the retainer 32 and is inserted into the airbag 40 (the cloth portion 43 on the vehicle interior side) is inserted into the side frame portion 15 and is tightened by the nut 36. By this tightening, the inflator assembly 30 is fixed to the side frame portion 15 together with the airbag 40.

The inflator assembly 30 may be fixed to the vehicle 10 (side frame portion 15) by a member different from the bolt 34 and the nut 36 described above.
As shown in FIG. 1, the side airbag device includes an impact sensor 75 and a control device 76 in addition to the airbag module AM described above. The impact sensor 75 is composed of an acceleration sensor or the like and is attached to the body side portion 11 (see FIG. 2) of the vehicle 10 and detects an impact applied to the body side portion 11 from the side. The control device 76 controls the operation of the inflator 31 based on the detection signal from the impact sensor 75.

  Furthermore, although the vehicle 10 is equipped with a seat belt device for restraining the occupant P seated on the vehicle seat 12, the seat belt device is not shown in FIG.

  As described above, the side airbag device of the present embodiment is configured. Next, a typical mode of operation (mode) will be described as an operation of the side airbag device. FIGS. 11A to 11C schematically show how the configuration of the pressure regulating valve 70 and the like change with time after the supply of the expansion gas G starts, and details are omitted and simplified. ing.

  In this side airbag device, as shown in FIGS. 1 and 2, when no impact is applied from the side to the vehicle 10 (body side portion 11) due to a side collision or the like, the control device 76 causes the inflator 31 to The operation signal for operating the is not output, and the inflation gas G is not supplied from the inflator 31 to the expansion part. The airbag 40 continues to be stored in the storage portion 18 together with the inflator assembly 30 in the storage form (see FIG. 3).

  On the other hand, when the vehicle 10 is traveling, an impact of a predetermined value or more is applied to the body side portion 11 due to a side collision or the like. The operation signal for operating this is output to 31. In response to this operation signal, in the inflator 31, the gas generating agent generates a high-temperature and high-pressure expansion gas G. The expansion gas G is first supplied to the rear side expansion portion 47 and the lower protection expansion portion 49 of the upper protection expansion portion 46 among the expansion portions. As a result, the pressure of the inflation gas is applied to each part of the rear side expansion part 47 and the lower protection expansion part 49, and each part of the rear side expansion part 47 and the lower protection expansion part 49 starts to expand.

When the lower protective inflating part 49 is deployed and inflated, it presses the waist part PP of the occupant P from the diagonally rear side toward the vehicle inner side.
Further, in the upper protective inflating portion 46, the partition member 50 in a folded state is disposed in a state where the folding line 51 is positioned on the upstream side of the opposed end portions 52 and 53. In addition, the partition member 50 is coupled to the corresponding cloth portions 43 and 44 of the airbag 40 by the outer coupling portions 54 and 55 at each of the opposed end portions 52 and 53 (see FIG. 5). Moreover, the partition member 50 is couple | bonded with both the cloth parts 43 and 44 by the periphery coupling | bond part 45 in each of the both ends (upper end part and lower end part) of the direction along the fold line 51 (refer FIG. 7). Therefore, the rear side expansion part 47 is developed from the rear toward the front. At this time, the two-folded partition member 50 is pulled into a curved surface. Then, tension (tension) is applied to the partition member 50 in the vertical direction (vertical direction) and the lateral direction (vehicle width direction) on the curved surface, and the partition member 50 tends to be in a tension state (FIGS. 6 and 8). reference).

  Internal pressure PI is applied to both valve body parts 73 and 74 located in the rear side expansion part 47 from the overlapping direction (thickness direction) (see FIG. 11A). This internal pressure PI is not as high as when the occupant P is restrained by the rear-side inflating portion 47. Both valve body portions 73 and 74 are brought into close contact with each other by the internal pressure PI, and are in a self-sealing state that restricts the flow of the expansion gas G between the valve body portions 73 and 74. Further, the overlapping portion 61 that is bent and overlapped with the non-overlapping portion 62 of the partition member 50 is pressed against the non-overlapping portion 62 by the internal pressure PI (see FIG. 6). Also from these things, it becomes easier to close both valve body parts 73 and 74 further.

  Here, as shown in FIG. 8, the partition member 50 is formed longer in the vertical direction (vertical direction) than in the horizontal direction (vehicle width direction) (L1> L1 ′> L2). That is, the partition member 50 has a vertical direction (vertical direction) not only with respect to a portion (the whole partition member 50) disposed in the expansion portion, but also in a portion disposed only in the upper protective expansion portion 46. And longer than the lateral direction (vehicle width direction). From this, in the partition member 50, it is easy to apply a stronger tension in the lateral direction (vehicle width direction) than in the longitudinal direction (vertical direction). In the present embodiment, since the inner opening 71 extends in the lateral direction (vehicle width direction) where the strong tension is easily applied, the inner opening 71 is easily closed.

  However, although there is a strength relationship between the tensions (tensions) as described above, tension (tension) is also applied in the vertical direction (vertical direction) to open the inner opening 71, so the inner opening 71 However, the inner opening 71 may be opened. However, even in this case, both valve body portions 73 and 74 are closed at least at their tip portions 73T and 74T. Even if the inner opening 71 is pulled in the vertical direction (vertical direction) due to the tension of the partition member 50 and a force is applied to open the inner opening 71, the force is applied to the inner opening 71. This is because it is the largest, becomes smaller as it gets farther from the inner opening 71, and becomes the smallest at the distal end portions 73T and 74T of both valve body portions 73 and 74.

  Further, in the present embodiment, the overlapping portion 61 that is bent toward the non-overlapping portion 62 side has the opposite end portions 52, 52 at both ends in the extending direction of the slit (inner connecting portion 63) by the outer connecting portions 54, 55. 53 and the fabric parts 43 and 44 (see FIG. 6). For this reason, when the rear side inflating portion 47 is deployed and inflated, the partition member 50 is not only strongly tensioned in the lateral direction (vehicle width direction), but also in the same direction with respect to the overlapping portion 61. A strong tension is applied.

  When both valve body parts 73 and 74 contact each other in at least a part of them, the pressure regulating valve 70 is closed. The expansion gas G in the rear side expansion part 47 is restricted from flowing (outflowing) to the front side expansion part 48 between the valve body parts 73 and 74 and through the inner opening 71. Due to the above restriction, the expansion gas G hardly flows through the inner opening 71. The expansion gas G in the rear side expansion part 47 does not flow to the front side expansion part 48 through the inner opening 71 or even if it flows. As a result, the expansion gas G accumulates in the rear side expansion part 47, and the internal pressure of the rear side expansion part 47 starts to rise exclusively.

  In the present embodiment, since the upper protective expansion portion 46 is partitioned into the rear side expansion portion 47 and the front side expansion portion 48 by the partition member 50, the volume of the rear side expansion portion 47 is defined by the upper protection expansion portion 46. Less than the volume if not. Therefore, the internal pressure of the rear side inflating portion 47 starts to rise faster than when the upper protective inflating portion 46 is not partitioned, and becomes higher. In particular, the expansion gas G in the rear side expansion portion 47 is allowed to flow only between the valve body portions 73 and 74, and flows out to the front side expansion portion 48 without passing between the valve body portions 73 and 74. Never do. Therefore, it is difficult for the increase rate of the internal pressure of the rear side expansion portion 47 to decrease due to the outflow of the expansion gas G.

  As the rear-side inflating portion 47 expands and inflates, the rear-side inflating portion 47 jumps forward from the seat back 14 with a part remaining in the storage portion 18. Thereafter, since the inflation gas G continues to be supplied to the rear side inflation part 47 of the upper protective inflation part 46, the rear side inflation part 47 is deformed in a manner along the back part PB of the occupant P as shown in FIG. However, it expands and expands at a position on the diagonally rear side of the back part PB of the passenger P. At this time, the rear inflating portion 47 is a portion on the rear side of the occupant P that includes the scapula PSB and the flank PR on the back portion PB of the occupant P (specifically, on the diagonally rear side of the back portion PB). The portion of the portion from the scapula PSB to the flank portion PR) is expanded and expanded in such a manner that the occupant P is pressed obliquely from behind. Specifically, the scapula PSB and the flank PR on the back PB of the occupant P as shown by the black arrows in FIG. The part including the part begins to be pressed. As a result, the upper body of the occupant P is pressed toward the vehicle inner side (the side away from the body side portion 11), and moves toward the vehicle inner side. At this time, the upper part of the upper half of the occupant P is mainly restrained by the rear-side expansion part 47.

  Here, as a result of analysis by the inventors, even when a load is applied to the flank portion PR of the occupant P, a load is applied from an oblique rear side of the occupant P compared to a case where a load is applied from the side of the occupant P. It was found that the resistance to the same load is significantly increased. The reason is considered as follows. The ribs that support the flank PR are supported by the occupant P's spine, and the back PB is closer to the support part of the ribs (specifically, the spine) than the side of the occupant P, so the resistance to the load is high. In addition, since the rib is easier to rotate with the support portion as a fulcrum when the load is applied obliquely behind than when the load is applied from the side of the occupant P, the force acting on the support portion via the rib or the rib itself The force acting so as to bend is reduced.

  In the present embodiment, when the airbag 40 is deployed and inflated forward on the side of the occupant P, the rear side inflating portion 47 whose internal pressure is higher than the front side inflating portion 48 causes the back portion PB of the occupant P to A portion including the scapula PSB and the flank PR is pressed from the rear of the passenger P obliquely. At this time, the load on the flank PR of the occupant P is also applied to the flank PR, but the load is applied in a manner that is more resistant to the occupant P than when the load is applied to the flank PR from the side. Can act. Thus, according to the present embodiment, when the rear side inflating portion 47 is deployed and inflated, the rear side portion having high resistance to the load among the side portions of the occupant P can be pressed in a manner in which the same resistance is increased. Therefore, it becomes possible to set the internal pressure of the rear side inflating part 47 to a high pressure, and the direction in which the occupant P is surely protected by the rear side inflating part 47, specifically, the direction to move to the inside of the vehicle. Can be suitably moved.

  In the present embodiment, the upper body of the occupant P is moved toward the inside of the vehicle by such pressing by the rear side inflating portion 47. By this movement, the space between the upper body of the occupant P and the body side portion 11 is widened, and a space for expansion and expansion of the front-side expansion portion 48 is secured. At the time of the above pressing, the rear side inflating part 47 is exclusively expanded and inflated in the upper protective inflating part 46, and therefore the place where the occupant P receives the pressure of the upper protective inflating part 46 is exclusively the rear side inflating part 47.

  The expansion gas G continues to be supplied into the rear side expansion portion 47 in a state in which both the valve body portions 73 and 74 are in close contact with each other (closed), while the adjustment is performed by the external force applied from the body side portion 11. The pressure valve 70 begins to open. That is, from the middle of the supply period of the inflation gas G to the upper protective inflation portion 46, an external force accompanying the restraint of the occupant P is applied and the upper protective inflation portion 46 is pressed and deformed. Accordingly, the tension (tension) that is strongly applied to the partition member 50 in the lateral direction (vehicle width direction) is reduced, and the tension (tension) that is applied in the vertical direction (vertical direction) is increased.

  Further, the internal pressure of the rear side expansion part 47 further increases with the above deformation of the upper protective expansion part 46, and the partition member 50 is pressed toward the front side expansion part 48 (see FIG. 11B). The tension applied to the partition member 50 changes. The difference in tension in both the vertical and horizontal directions is reduced by the change in tension. The deformation of the inner opening 71 located in the partition member 50 is allowed, and the operation of the valve body portions 73 and 74 located in the partition member 50 is allowed.

  On the other hand, the overlapping portion 61 is overlapped with the non-overlapping portion 62 and is connected to the cloth portions 43 and 44 of the airbag 40 by outer connecting portions 54 and 55 at both ends in the lateral direction (vehicle width direction). . For this reason, in the overlapping portion 61, the portion near the outer coupling portions 54 and 55 has a strong force for maintaining the overlapping state. However, this force decreases as the distance from the outer coupling portions 54 and 55 increases, and becomes minimum at the central portion in the lateral direction (vehicle width direction), that is, both valve body portions 73 and 74. For this reason, the overlapping portion 61 pulled in the vertical direction (vertical direction) is deformed in the same direction only in the valve body portions 73 and 74 and the vicinity thereof.

  When the inner opening 71 is opened to some extent, in the overlapping portion 61, only in the valve body portions 73 and 74 that have received the high internal pressure PI of the rear side expansion portion 47, the front side expansion portion 48 passes through the inner opening portion 71. Pushed out (inverted). When the width W1 in the vertical direction of the inner opening 71 is narrow, the tip portions 73T and 74T come into contact with each other, and both valve body portions 73 and 74 are closed at the tip portions 73T and 74T (see FIG. 11B). This state continues for a period in which the width W1 of the inner opening 71 is narrower than the total value (= 2 · W2) of the width W2 (see FIG. 11C) of the valve body portions 73 and 74.

  When the width W1 of the inner opening 71 is larger than the total value (= 2 · W2), the tip portions 73T and 74T are separated (see FIG. 11C), and the pressure regulating valve 70 is opened. . The distribution restriction is released, and the expansion gas G in the rear side expansion portion 47 is allowed to flow out to the front side expansion portion 48 through the inner opening 71 and the valve body portions 73 and 74 in order. The

  By the outflow of the expansion gas G, the internal pressure of the rear side expansion portion 47 changes from increasing to decreasing. However, the body side portion 11 continues to enter the vehicle inner side, and the upper protective inflating portion 46 is pressed by the occupant P at the rear side inflating portion 47.

  Further, the inflow of the expansion gas G starts to increase the internal pressure of the front expansion portion 48. As a result, as shown in FIG. 10, the front-side expansion portion 48 expands and expands so as to enter a narrow gap between the occupant P and the body side portion 11. As a result, the upper protective inflating portion 46 is pressed by the occupant P at the front side inflating portion 48 in addition to the rear side inflating portion 47, and the occupant P is restrained by the rear side inflating portion 47 and the front side inflating portion 48. Is done.

  The front inflating portion 48 tends to expand and inflate at a front side portion of the occupant P with a lower internal pressure than the rear inflating portion 47. At this time, since the space between the body side portion 11 and the occupant P is widened by the rear side inflating portion 47, a space for expanding and inflating the front side inflating portion 48 is secured. Therefore, the front-side expansion portion 48 is more easily expanded and expanded toward the front side than when the interval is not enlarged.

  In the present embodiment, the inflow of the inflation gas G from the rear side inflating portion 47 to the front side inflating portion 48 is restricted before the occupant P is restrained by the rear side inflating portion 47, and the occupant P by the rear side inflating portion 47. Allowed when restraining. Therefore, when the airbag 40 is deployed and inflated, the rear side inflatable portion 47 can be first inflated and inflated, and the occupant P is moved away from the deployed position of the airbag 40 by the pressure by the rear side inflatable portion 47. Can do. Thereafter, the front side expansion portion 48 can be expanded and expanded. Therefore, the airbag 40 can be deployed and inflated while ensuring a space for deploying and inflating the airbag 40.

  Further, in the present embodiment, since the front side expansion part 48 is deployed and inflated in front of the rear side expansion part 47, the front side expansion part 48, that is, the part on the front side in the side part of the occupant P by the low internal pressure part. Can be restrained, and the occupant P can be suitably protected.

  Further, in the present embodiment, the portion of the partition member 50 that becomes the boundary between the rear-side inflating portion 47 and the front-side inflating portion 48 is substantially the center in the front-rear direction at the side portion of the occupant P when the airbag 40 is fully deployed and inflated. It is formed at the position. As a result, the rear-side inflatable portion 47 can be deployed and inflated on the rear side of the side of the occupant P, so that the configuration in which the back of the occupant P is pressed from the diagonally rear side by the rear-side inflatable portion 47 can be easily realized. can do. And since the front side expansion part 48 can be expand | deployed and inflated in the front side in the passenger | crew's P side, the front side part in the side part of the passenger | crew P by the front side expansion part 48 can be protected suitably. .

  In the present embodiment, the airbag 40 is thus interposed between the upper body of the occupant P and the body side portion 11 entering the vehicle inside. The upper body of the occupant P is pressed toward the inside of the vehicle by the airbag 40 and restrained. Therefore, the impact from the side transmitted to the upper body through the body side portion 11 is alleviated by the airbag 40, and the upper body is protected.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The rear-side inflatable portion 47 is formed in a shape that expands and inflates in such a manner that a portion including the scapula PSB and the flank PR in the back portion PB of the occupant P is pressed from the rear side of the occupant P. Therefore, when the rear side inflating portion 47 is deployed and inflated, the rear side portion having high resistance to the load among the side portions of the occupant P can be pressed in a manner in which the same resistance is increased. Therefore, it becomes possible to set the internal pressure of the rear side inflating part 47 to a high pressure, and the occupant P can be suitably moved by the rear side inflating part 47 in a direction in which the protection is ensured. And since the front side expansion part 48 expand | deploys and expands in the front side rather than the rear side expansion part 47, the front side part with the said low resistance in the front part expansion part 48, ie, the side part of the passenger | crew P, by the low internal pressure part. Can be restrained, and the occupant P can be suitably protected. Therefore, it is possible to protect the occupant P by suitably using a portion having high resistance to load in the body.

  (2) Inflow of the inflation gas G from the rear side expansion part 47 to the front side expansion part 48 is restricted before the occupant P is restrained by the rear side expansion part 47, and the occupant P is restrained by the rear side expansion part 47. Sometimes allowed. Therefore, the airbag 40 can be deployed and inflated while ensuring a space for deploying and inflating the airbag 40.

  (3) The portion disposed in the upper protective inflating portion 46 of the partition member 50 is formed at a position that is substantially the center in the front-rear direction on the side portion of the occupant P when the airbag 40 is completely deployed and inflated. Therefore, the rear side inflating part 47 can be deployed and inflated on the rear side of the side of the occupant P, and the configuration in which the back side of the occupant P is pressed from the oblique rear side by the rear side inflating part 47 can be easily realized. Can do. And since the front side expansion part 48 can be expand | deployed and inflated in the front side in the passenger | crew's P side, the front side part in the side part of the passenger | crew P by the front side expansion part 48 can be protected suitably. .

The above embodiment may be modified as follows.
-The structure of the pressure regulation valve 70 can be changed arbitrarily. The point is that the inflow of the inflation gas G from the rear side inflating part 47 to the front side inflating part 48 can be restricted before the occupant P is restrained by the rear side inflating part 47, and the occupant by the rear side inflating part 47. Any structure that can release the restriction when P is restrained can be adopted instead of the pressure regulating valve 70.

  In place of the pressure regulating valve 70, there may be provided one that regulates and cancels the flow of the expansion gas from the rear side expansion part 47 to the front side expansion part 48 according to the internal pressure of the rear side expansion part 47. . For example, instead of the pressure regulating valve 70, a slit, a vent hole, or the like can be formed. In this case, when the internal pressure of the rear side expansion portion 47 is low, the flow of the expansion gas is restricted, while when the internal pressure exceeds a certain value, the restriction is released, that is, the flow of the expansion gas is allowed. There may be.

  -The formation position of the part arrange | positioned in the said upper protection expansion part 46 of the division member 50 is not restricted to the center of the front-back direction in the passenger | crew's P side part, It can change arbitrarily. In order to realize a configuration in which the occupant P is pressed obliquely rearward by the rear-side inflatable portion 47, it is desirable that the formation position is located on the rear side from the center in the front-rear direction on the side portion of the occupant P.

  The airbag 40 may be substantially entirely composed of an inflatable portion as in the above embodiment, but has a non-inflatable portion that does not inflate without being supplied with the inflation gas. There may be.

-The lower protective inflation part 49 of the airbag 40 may be omitted.
The inflator assembly 30 may be provided outside the airbag 40. In this case, the inflator 31 and the rear side expansion part 47 may be connected by a pipe, and the inflation gas from the inflator 31 may be supplied to the rear side expansion part 47 via this pipe.

  -The present invention is not limited to the side airbag device that protects the portion from the shoulder PS to the chest PT and the waist PP, and the portion from the shoulder PS to the chest PT, the portion from the head to the chest PT, Or it can apply also to the side airbag apparatus which protects the site | part (except waist part PP) above waist part PP from an impact.

  The present invention relates to a vehicle 10 in which the vehicle seat 12 is disposed in a posture in which the seat back 14 faces a direction different from the front of the vehicle 10, for example, a side (vehicle width direction). When an impact is applied from the direction (front-rear direction of the vehicle 10), the present invention is also applicable to a side airbag device that protects the occupant P from the impact.

  -Vehicles to which the side airbag device of the present invention is applied include not only private vehicles but also various industrial vehicles.

  DESCRIPTION OF SYMBOLS 12 ... Vehicle seat, 18 ... Storage part, 31 ... Inflator, 40 ... Air bag, 46 ... Upper protection expansion part, 47 ... Back side expansion part, 48 ... Front side expansion part, 50 ... Partition member, 70 ... Pressure regulating valve (Communication part).

Claims (3)

An airbag stored in a storage portion near the side of the occupant seated on the vehicle seat is moved forward on the side of the occupant by the inflation gas supplied in response to an impact applied from the side of the vehicle seat. A side airbag device that is deployed and inflated toward the airbag, wherein the airbag is supplied with the inflation gas therein and deployed and inflated on the rear side, and the inflation gas from the rear side inflation portion The inflow amount of the expansion gas flows from the rear side expansion part into the front side expansion part. In the side airbag device having a communication portion that allows while restricting,
The side airbag device according to claim 1, wherein the rear-side inflating portion is deployed and inflated in such a manner that a portion including the scapula and flank on the back of the occupant is pressed obliquely from behind the occupant. In the side airbag device according to claim 1,
The communication part restricts the inflow of the inflation gas from the rear side inflating part to the front side inflating part before restraining the occupant by the rear side inflating part, and restricts the regulation when the occupant is restrained by the rear side inflating part. A side airbag device characterized by being released. In the side airbag device according to claim 1 or 2,
The apparatus is characterized in that the boundary between the rear-side inflating portion and the front-side inflating portion is set to a position that is the center in the front-rear direction on the side of the occupant when the airbag is inflated and inflated. Side airbag device.