JP2011140246A - Side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a side airbag device suppressing the loss of a gas when an airbag deploys normally, and suppressing the excessive rise of the gas pressure in the airbag when the airbag fails to deploy normally. <P>SOLUTION: In the side airbag device 10, the airbag 20 is formed with a vent hole 48 in the rear side in the fore-and-aft direction of a seatback 18, and in the region opposing to a part of a side (side-door side) separating from the seatback frame, in an outer peripheral surface of a diffuser 28. When the airbag 20 deploys normally, the diffuser 28 narrows (or blocks in certain circumstances) a discharge passage to the vent hole 48. On the other hand, when normal deployment of a shoulder chamber 38 is blocked by an arm 14A of a seated occupant 14, the gas pressure in a chest chamber 40 rises, thereby pressing the diffuser 28 radially inward, so as to expand (open) the discharge passage to the vent hole 48. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a side airbag device provided in a seat back of a vehicle seat.

  The side airbag device disclosed in Patent Document 1 below includes an airbag that is inflated and deployed to the front side of the seat back by gas generated from the inflator, and gas is discharged to the front edge portion of the airbag. For this purpose, a vent hole having a slit shape or a long hole shape is formed. The vent hole adjusts the amount of exhaust gas by changing the opening area according to the inflated and deployed state of the airbag.

JP 2008-1142 A

  By the way, depending on the collision condition of the vehicle, a gap necessary for deploying the airbag may not be ensured between the door trim of the side door and the arm of the seated occupant. In such a case, the gas pressure in the airbag becomes higher than necessary because the inflator generates gas in the airbag that cannot be deployed normally due to the arm of the seated occupant. In the side airbag device, since the deployment of the airbag is incomplete, the middle of the discharge path to the vent hole is blocked. For this reason, the gas in an airbag is not fully discharged | emitted out of an airbag via a vent hole, and the gas pressure in an airbag may not fully be reduced.

  On the other hand, in a side airbag device in which the discharge path from the gas ejection port of the inflator to the vent hole is not bent in a complicated manner, the vent hole is inflated and deployed to the front edge of the airbag, that is, the front side of the seat back. If it is formed on the side where the gas is positively supplied, the gas may be discharged from the vent hole even when the airbag is normally deployed.

  In consideration of the above facts, the present invention can suppress the loss of gas when the airbag is normally deployed, and suppress the excessive increase in gas pressure in the airbag when the airbag cannot be deployed normally. The object is to obtain a side airbag device that can be used.

  The side airbag device according to the invention of claim 1 is fixed to the outside in the width direction of the seat back frame in the seat back of the vehicle seat, and includes a gas generating means for generating gas by operating and a cloth material. A diffuser that is formed in a cylindrical shape and accommodates the gas generating means inside and is provided in the seat back in a state where the axial direction is along the vertical direction of the seat back, and the diffuser is accommodated inside the seat, and the seat is in a folded state The gas generated by the gas generating means is stored in the bag and is expanded and deployed in the front side and the vertical direction of the seat back by ejecting from the upper and lower openings of the diffuser, and the seat back of the outer peripheral surface of the diffuser In the front-rear direction of the rear side and part of the side facing away from the seat back frame Ntohoru and a, and an air bag is formed.

  In the side airbag device according to the first aspect, a diffuser formed in a tubular shape by a cloth material is accommodated in the airbag, and a gas generating means is accommodated inside the diffuser. When this gas generating means is activated, the gas generated from the gas generating means is ejected from the upper and lower openings of the diffuser. Thereby, the airbag is inflated and deployed in the front side of the seat back and in the vertical direction.

  Here, in this airbag, a vent hole is formed in a part of the outer peripheral surface of the diffuser that is opposed to a part on the rear side in the front-rear direction of the seat back and on the side away from the seat back frame. The part is a part where the arrival of the gas ejected from the upper and lower openings of the diffuser is delayed. Moreover, when the inflator is activated, the diffuser expands in the radial direction due to the gas pressure, and the outer peripheral surface of the diffuser approaches the inner peripheral surface of the airbag. Therefore, the discharge path to the vent hole can be narrowed by the diffuser. Therefore, when the airbag is normally deployed, it is possible to suppress the discharge of gas to the outside of the airbag through the vent hole, that is, the loss of gas.

  On the other hand, for example, when the airbag cannot be normally deployed due to obstruction by the arm of the seated occupant, the diffuser is pressed in the radial direction by increasing the gas pressure in the airbag. Accordingly, the outer peripheral surface of the diffuser is separated from the inner peripheral surface of the airbag and the discharge path to the vent hole is widened, so that the gas in the airbag is easily discharged out of the airbag through the vent hole. Thereby, it can suppress that the gas pressure in an airbag rises too much.

  A side airbag device according to a second aspect of the present invention is the side airbag device according to the first aspect, wherein the vent hole is arranged so as to be shifted in the vertical direction of the seat back with respect to the gas generating means. It is characterized by having.

  In the side airbag device according to claim 2, when a space for inflating the airbag is not secured on the side opposite to the seatback frame with respect to the gas generating means (for example, the side door is seatbacked by side collision). Even in the case of intrusion to the side), a discharge path (flow path) to the vent hole can be secured in the airbag on the upper side or the lower side of the gas generating means.

  A side airbag device according to a third aspect of the present invention is the side airbag device according to the first or second aspect, wherein the interior of the airbag is partitioned into an upper chamber and a lower chamber, and the diffuser The upper end opening communicates with the upper chamber, the lower end opening communicates with the lower chamber, and the vent hole communicates the upper chamber with the outside of the airbag.

  In the side airbag device according to claim 3, the gas ejected from the upper end opening of the diffuser is supplied to the upper chamber of the airbag, and the gas ejected from the lower end opening of the diffuser is supplied to the lower chamber of the airbag. By being supplied to the airbag, the airbag is inflated and deployed. Accordingly, for example, the chest of the seated occupant can be protected by the upper chamber of the airbag, and the waist of the seated occupant can be protected by the lower chamber of the airbag.

  In addition, for example, when the upper chamber of the airbag is incompletely deployed because it is obstructed by the arm of a seated occupant, the gas pressure in the upper chamber rises, causing the gas in the upper chamber to flow outside the airbag via the vent hole. Is discharged. Thereby, since it can suppress that the gas pressure in an upper chamber rises too much, it can prevent thru | or suppress that the chest of a seated crew member is compressed by the upper chamber of an airbag.

  A side airbag device according to a fourth aspect of the present invention is the side airbag device according to the first or second aspect, wherein the airbag has an intermediate portion between the upper chamber, the lower chamber, and the upper and lower chambers. The diffuser has an upper end opening communicated with the upper chamber and a lower end opening communicated with the lower chamber. The diffuser is connected to the intermediate chamber via a communication port formed in an intermediate portion in the vertical direction. The vent hole communicates with the intermediate chamber and communicates with the outside of the airbag.

  In the side airbag device according to the fourth aspect, the gas ejected from the upper end opening of the diffuser is supplied to the upper chamber of the airbag, and the upper chamber of the airbag is inflated and deployed. Further, gas ejected from the lower end opening of the diffuser is supplied to the lower chamber of the airbag, and the lower chamber of the airbag is inflated and deployed. Further, the gas ejected from the communication port formed in the intermediate portion in the vertical direction of the diffuser is supplied to the intermediate chamber of the airbag, and the intermediate chamber of the airbag is inflated and deployed. Accordingly, for example, the shoulder of the seated occupant can be protected by the upper chamber of the airbag, the chest of the seated occupant can be protected by the intermediate chamber of the airbag, and the waist of the seated occupant can be protected by the lower chamber of the airbag.

  In addition, for example, when the upper chamber of the airbag is incompletely deployed because it is obstructed by the arm of the seated occupant, the gas pressure in the intermediate chamber rises, causing the gas in the intermediate chamber to flow outside the airbag via the vent hole. Is discharged. Thereby, since it can suppress that the gas pressure in an intermediate chamber rises too much, it can prevent thru | or suppress that the chest of a seated crew member is compressed by the intermediate chamber of an airbag.

  As described above, in the side airbag device according to the first aspect of the present invention, gas loss can be suppressed when the airbag is normally deployed, and when the airbag cannot be deployed normally, It can suppress that the gas pressure in a bag rises too much.

  In the side airbag device according to the second aspect of the present invention, even if a space for inflating the airbag is not secured on the side opposite to the seat back frame with respect to the gas generating means, the airbag is vented to the vent hole. It is possible to secure a gas discharge path (flow path).

  In the side airbag device according to the third aspect of the invention, the chest of the seated occupant can be protected by the upper chamber of the airbag, and the waist of the seated occupant can be protected by the lower chamber of the airbag. It is possible to prevent or suppress the chest from being compressed by the upper chamber of the airbag.

  In the side airbag device according to the fourth aspect of the invention, the shoulder of the seated occupant is protected by the upper chamber of the airbag, the chest of the seated occupant is protected by the intermediate chamber of the airbag, and the lower chamber of the airbag is used. The waist of the seated occupant can be protected and the chest of the seated occupant can be prevented or suppressed from being compressed by the intermediate chamber of the airbag.

1 is a schematic side view showing a configuration of a main part of a vehicle seat on which a side airbag device according to an embodiment of the present invention is mounted. It is an expanded sectional view which shows the cut surface along the 2-2 line of FIG. It is an expanded sectional view which shows the cut surface along line 3-3 in FIG. In the side airbag apparatus which concerns on embodiment of this invention, it is a side view which shows the state which cannot be normally expanded by being obstructed by the arm of a seated passenger. It is an expanded sectional view which shows the cut surface along line 5-5 in FIG. It is an expanded sectional view which shows the cut surface along line 6-6 of FIG. FIG. 3 is an enlarged cross-sectional view corresponding to FIG. 2 for explaining a state in which a space for inflating the airbag is not secured on the side opposite to the frame side portion with respect to the inflator. It is an expanded sectional view which shows the cut surface along line 8-8 of FIG.

  Hereinafter, the side airbag apparatus 10 which concerns on embodiment of this invention is demonstrated using FIGS. Note that an arrow FR appropriately shown in each drawing indicates a front side of the vehicle seat 12 on which the side airbag device 10 is mounted, an arrow UP indicates an upper side of the vehicle seat 12, and an arrow IN indicates the vehicle. The width direction inner side of the sheet | seat 12 is shown.

  FIG. 1 is a schematic side view showing a configuration of a main part of a vehicle seat 12 according to the present embodiment. As shown in this figure, a vehicle seat 12 includes a seat cushion 16 on which an occupant 14 is seated, and a seat back that is supported at a rear end portion of the seat cushion 16 so as to be tiltable and used as a backrest of the seated occupant 14. 18. In the present embodiment, the front direction, the upper direction, and the width direction of the vehicle seat 12 substantially coincide with the front direction, the upper direction, and the width direction of the vehicle.

  A side airbag device 10 is disposed inside a door side portion 18A (side portion on the side door not shown) of the seat back 18. The side airbag device 10 includes an airbag 20 that inflates and deploys to the front side of the seat back 18 to protect the seated occupant 14, and an inflator 22 (gas generating means) that supplies gas into the airbag 20. In addition, what is unitized with the inflator 22 in a state in which the airbag 20 is folded is provided in the door side portion 18.

  1 to 8 show a state in which the airbag 20 is inflated and deployed. Although illustration is omitted, a seat back pad (urethane pad) covered with a seat skin is disposed around the side airbag device 10, and the seat skin is inflated when the airbag 10 is inflated and deployed. The stitching portion and the seat back pad are configured to be cleaved.

  The inflator 22 is disposed inside the door side portion 18 on the outer side in the width direction of the seat back frame 24 (see FIG. 2) (on the side door not shown), and is fixed to the frame side portion 24 </ b> A constituting the seat back frame 24. Has been. The frame side portion 24 </ b> A is formed of a sheet metal material and extends along the vertical direction of the seat back 18. The seat back frame 24 is configured in a substantially inverted U shape with the lower part opened when viewed from the front side of the seat back 18, and frame side portions 24A are disposed on both sides in the width direction.

  The inflator 22 is formed in a substantially cylindrical shape, and is disposed in the vicinity of the central portion in the vertical direction of the seat back 18 with the axial direction (longitudinal direction) being along the vertical direction of the seat back 18. A stud bolt 22 </ b> A protruding outward in the radial direction of the inflator 22 is provided on the outer peripheral portion of the inflator 22. The stud bolt 22A protrudes inward in the seat width direction of the frame side portion 24 through a through hole formed in the frame side portion 24A, and a nut 26 is screwed into the protruding portion. Thereby, the inflator 22 is fixed to the frame side portion 24A. In addition, a gas ejection part 22 </ b> B in which a gas ejection port is formed is provided at the lower end of the inflator 22.

  The inflator 22 described above is housed inside the airbag 20 together with a diffuser 28 for rectifying the gas ejected from the gas ejection part 22B. As shown in FIGS. 2 and 3, the airbag 20 includes an inner base fabric 30 and an outer base fabric 32 disposed on the outer side in the width direction of the seat back 18 with respect to the inner base fabric 30. The outer peripheral edges of the inner base cloth 30 and the outer base cloth 32 are stitched to form a bag shape.

  The airbag 20 is large enough to cover the shoulder, chest, and waist of the seated occupant 14. Inside the airbag 20, an upper partition cloth 34 and a lower partition cloth 36 that also serve as a tether are disposed. The outer peripheral edge of the upper partition cloth 34 and the lower partition cloth 36 is stitched to the inner peripheral surface of the airbag 20, and the interior of the airbag 20 is separated from the upper chamber by the upper partition cloth 34 and the lower partition cloth 36. It is divided into a shoulder chamber 38, a middle chamber chest chamber 40, and a lower chamber waist chamber 42.

  On the other hand, the diffuser 28 is disposed in the chest chamber 40 on the rear end side of the airbag 20 (on the side of the frame side portion 24A). As shown in FIG. 2, the diffuser 28 has a single cloth material overlapped at both ends, and the overlapping portion is connected to the stitching portion 46 on the rear end side of the inner base fabric 30 and the outer base fabric 32. It is formed in a cylindrical shape by being sewn together, and is arranged in a state where the axial direction is along the vertical direction of the seat back 18. The diffuser 28 accommodates the inflator 22 described above inside (in a cylinder). As shown in FIG. 2, the inflator 22 is disposed in the vicinity of the stitching portion 46 on the rear end side of the inner base fabric 30 and the outer base fabric 32, and the stud bolt 22 </ b> A is connected to the diffuser 28 and the inner base fabric 30. Is fixed to the frame side portion 24A.

  As shown in FIG. 3, the diffuser 28 has an upper end opening 28 </ b> A communicating with the shoulder chamber 38 through an upper communication port 34 </ b> A formed in the upper partition cloth 34, and a lower end opening 28 </ b> B on the lower side. It communicates with the waist chamber 42 via a lower communication port 36 </ b> A formed in the partition cloth 36. Further, an intermediate communication port 28 </ b> C (see FIG. 1) facing the front side of the seat back 18 is formed in the intermediate portion in the vertical direction of the diffuser 28.

  Therefore, the gas ejected from the gas ejection part 22B of the inflator 22 flows into the shoulder chamber 38 through the upper communication port 34A, flows into the waist chamber 42 through the lower communication port 36A, It flows into the chest chamber 40 through the intermediate communication port 28C (see the arrow indicated by the thick broken line in FIG. 1). Thereby, the airbag 20 is inflated and deployed in the front side and the vertical direction of the seat back 18. Specifically, the shoulder chamber 38 is inflated and deployed between the shoulder of the seated occupant 14 and a side door (not shown), and the chest chamber 40 is inflated and deployed between the chest of the seated occupant 14 and the side door. The waist chamber 42 is inflated and deployed between the waist of the seated occupant 14 and the side door.

  Note that the volume of the gas ejected from the inflator 22 is set to a volume that can sufficiently inflate and deploy each of the shoulder chamber 38, the chest chamber 40, and the waist chamber 42. Further, since the gas ejected from the inflator 22 is rectified so as to flow upward and downward by the diffuser 28, the gas is preferentially supplied to the shoulder chamber 38 and the waist chamber 42. In other words, the size of the intermediate communication port 28 </ b> C is set to a size that does not prevent the preferential gas supply to the shoulder chamber 38 and the waist chamber 42. Accordingly, the internal pressure (gas pressure) of the shoulder chamber 38 and the waist chamber 42 is configured to be higher than the internal pressure (gas pressure) of the chest chamber 40.

Further, in the present embodiment, the outer base fabric 32 of the airbag 20 is formed with a vent hole 48 (discharge port) for discharging the gas in the airbag 20. The vent hole 48 is disposed in the vicinity of the stitching portion 46 on the rear end side of the outer base fabric 32, and is located on the rear side (here, the vehicle rear side) in the front-rear direction of the seat back on the outer peripheral surface of the diffuser 28. It faces a part of the side that is separated from the seat back frame 24 (the side opposite to the seat back frame 24, the side door not shown here). The vent hole 48 is formed in the shape of a long hole whose longitudinal direction is along the vertical direction of the airbag 20, and is arranged so as to be shifted to the upper side of the seat back 18 with respect to the inflator 22.
(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When the vehicle has a side collision, a side collision state is detected by an airbag sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the side airbag device 10 should be operated based on the input signal. When it is determined that the airbag is activated, a predetermined current is supplied to the inflator 22. Thereby, the inflator 22 is operated to generate gas, and the gas is ejected from the gas ejection port of the gas ejection part 22B.

  The gas ejected from the inflator 22 is rectified by the diffuser 28 and flows into the shoulder chamber 38, the chest chamber 40, and the lumbar chamber 42 of the airbag 20. As a result, the shoulder chamber 38 is inflated and deployed between the shoulder portion of the seated occupant 14 and the side door, the chest chamber 40 is inflated and deployed between the chest portion of the seated occupant 14 and the side door, and the lumbar chamber 42 is seated. It expands and deploys between the waist of the occupant 14 and the side door. Thus, the shoulder portion of the seated occupant 14 is protected by the shoulder chamber 38, the chest portion of the seated occupant 14 is protected by the chest chamber 40, and the waist portion of the seated occupant 14 is protected by the waist chamber 42.

  Here, a vent hole 48 is formed in the airbag 20 at a portion of the outer peripheral surface of the diffuser 28 facing a part on the rear side in the front-rear direction of the seat back and the side away from the seat back frame 24. However, this portion is a portion where the arrival of the gas ejected from the upper end opening 28A, the intermediate communication port 28C, and the lower end opening 28B of the diffuser 28 is delayed (see arrow G indicated by a thick broken line in FIG. 1). . In addition, when the inflator 22 is operated, as shown in FIG. 2, the diffuser 28 expands in the radial direction by the gas pressure, the outer peripheral surface of the diffuser 28 approaches the inner peripheral surface of the airbag 20, and the vent hole 48 is moved by the diffuser 28. The discharge path to the is narrowed (in some cases, the vent hole 48 is blocked). Therefore, when the airbag 20 is normally deployed, gas discharge to the outside of the airbag 20 through the vent hole 48, that is, gas loss is suppressed.

  On the other hand, for example, as shown in FIG. 4, when the shoulder chamber 38 cannot be normally expanded due to the inhibition by the arm 14 </ b> A of the seated occupant 14, the gas pressure in the chest chamber 40 rises, and FIG. As shown, the diffuser 28 is pressed radially inward. As a result, the outer peripheral surface of the diffuser 28 is separated from the inner peripheral surface of the airbag 20 and the discharge path to the vent hole 48 is widened. For this reason, the gas in the chest chamber 40 is easily discharged out of the airbag 20 through the vent hole 48 (see the arrows shown in bold lines in FIGS. 4 and 5). Thereby, since it is suppressed that the gas pressure in the chest chamber 40 increases too much, the chest of the seated occupant 14 is prevented from being compressed by the chest chamber 40. As shown in FIG. 6, since a gas flow G directed directly from the lower end opening 28B of the diffuser 28 toward the vent hole 48 is also generated, it is possible to prevent the gas pressure in the waist chamber 42 from rising excessively. The

  As described above, in the side airbag device 10 according to the present embodiment, the loss of gas can be suppressed when the airbag 20 is normally deployed, and the airbag when the airbag 20 cannot be deployed normally. It can suppress that the gas pressure in 20 rises too much.

  In addition, the vent hole 48 is simply provided at a predetermined portion of the airbag 20 (a portion of the outer peripheral surface of the diffuser 28 opposite to a portion opposite to the inflation and deployment direction of the airbag 20 and facing away from the seat back frame 24). Since it only needs to be formed, an increase in manufacturing cost can be minimized.

  In other words, if a vent hole (so-called variable vent hole) or the like that allows the inside and outside of the airbag 20 to communicate with each other by tearing or the like when the gas pressure in the airbag 20 rises to a predetermined value or more is used, the same as in the present embodiment. Although the effect can be obtained, in that case, a manufacturing process for setting the variable vent hole is required, which increases the manufacturing cost of the side airbag device.

  In this respect, in the present embodiment, a configuration in which the vent hole 48 (simple hole) is opened and closed using the diffuser 28 for rectifying the gas ejected from the inflator 22, that is, a simple hole is made variable by using an existing configuration. Since the structure functions like a hole, an increase in manufacturing cost can be suppressed.

  Further, in the present embodiment, the vent hole 48 is disposed so as to be shifted to the upper side of the seat back 18 with respect to the inflator 22. Therefore, for example, when the side door enters the seat back 18 side due to a side collision, a space for the airbag 20 to inflate on the side opposite to the frame side portion 24A with respect to the inflator 22 as shown in FIG. Even when the seat back pad P is not secured (when the seat back pad P has entered the frame side portion 24A side), as shown in FIG. 8, the gas discharge path (to the vent hole 48 in the airbag 20 above the inflator 22) Channel) 50 can be secured.

  In the above embodiment, the airbag 20 includes the upper partition cloth 34 and the lower partition cloth 36, and the interior of the airbag 20 is the upper chamber shoulder chamber 38, the middle chamber chest chamber 40, and the lower chamber waist. Although it was set as the structure divided into the chamber 42, invention of Claim 1 is not restricted to this, The structure of an airbag can be changed suitably. For example, only one partition cloth may be provided inside the airbag, and the interior of the airbag may be divided into two chambers, a chest chamber (upper chamber) and a waist chamber (lower chamber). In this case, it is possible to prevent the internal pressure of the chest chamber from rising excessively, as in the above embodiment, by communicating the chest chamber with the outside of the airbag through the vent hole.

  In the above embodiment, a check valve is set at the upper communication port 34A of the upper partition cloth 34 and the lower communication port 36A of the lower partition cloth 36 so that the gas flowing into the shoulder chamber 38 and the waist chamber 42 The gas that has flown into the chest chamber 40 may be prevented from flowing back to the chest chamber 40 side.

  Furthermore, in the said embodiment, although it was set as the structure where the vent hole 48 shifted | deviated to the upper side of the seat back 18 with respect to the inflator 22, the invention of Claim 1 is not restricted to this, The vent hole 48 of The arrangement in the vertical direction can be changed as appropriate.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiments.

DESCRIPTION OF SYMBOLS 10 Side airbag apparatus 12 Vehicle seat 18 Seat back 20 Air bag 22 Inflator (gas generation means)
24 Seat back frame 28 Diffuser 28C Intermediate communication port (communication port)
38 Shoulder chamber (upper chamber)
40 Chest chamber (intermediate chamber)
42 Lumbar chamber (lower chamber)
48 Venthole

Claims (4)

A gas generating means for generating gas by being fixed and actuated on the outside in the width direction of the seat back frame in the seat back of the vehicle seat;
A diffuser that is formed into a cylindrical shape by a cloth material, accommodates the gas generating means inside, and is provided in the seat back in a state where the axial direction is along the vertical direction of the seat back;
The diffuser is housed inside, stored in the seat back in a folded state, and the gas generated by the gas generating means is blown out from the upper and lower openings of the diffuser so as to expand and deploy in the front side and the vertical direction of the seat back. And an airbag in which a vent hole is formed in a portion facing the rear side of the outer peripheral surface of the diffuser in the front-rear direction of the seat back and a part on the side away from the seat back frame,
Side airbag device provided with.   2. The side airbag device according to claim 1, wherein the vent hole is arranged so as to be shifted in a vertical direction of the seat back with respect to the gas generating means.   The interior of the airbag is partitioned into an upper chamber and a lower chamber, and the diffuser has an upper end opening communicated with the upper chamber, a lower end opening communicated with the lower chamber, and the vent hole is The side airbag device according to claim 1, wherein the upper chamber communicates with the outside of the airbag.   The interior of the airbag is partitioned into an upper chamber, a lower chamber, and an intermediate chamber between the upper and lower chambers, and the diffuser has an upper end opening communicated with the upper chamber and a lower end opening communicated with the lower chamber. The vent hole communicates with the intermediate chamber and the outside of the airbag through the communication port formed in the middle portion in the vertical direction. 2. The side airbag device according to 2.

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