JP2007284026A - Airbag and airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag and airbag device equipped with the airbag capable of inflating into a diameter direction quickly in an airbag with its inside partitioned into a center first chamber and a peripheral chamber surrounding it. <P>SOLUTION: The inside of the airbag 10 is partitioned into the center first chamber 1 and the peripheral chamber surrounding the first chamber 1 by inner panels 22A and 22B, and the peripheral chamber is partitioned into a second chamber 2 on the rear side and a third chamber 3 by a separate panel 60. An opening 61 is provided on the separate panel 60, and a continuous body of the inner panels 22A and 22B is inserted into the opening 61. The first chamber 1 and the second chamber 2 are communicated with each other by a first communication port 27 of the inner panel 22B, and the second chamber 2 and the third chamber 3 are communicated with each other by the opening 61 of the separate panel 60 and a second communication port 62. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an airbag and an airbag device that are installed in a vehicle and inflated in an emergency such as a collision of the vehicle to restrain an occupant. In particular, the present invention relates to an airbag and an airbag apparatus that are suitable for use in a driver's seat of a vehicle.

  The airbag device for a driver's seat has an airbag formed by sewing the peripheral portions of the front panel on the passenger side and the rear panel on the opposite side. In the center of the rear panel, an inflator engagement opening for receiving the tip end side of the inflator is provided. The periphery of this opening is attached to the retainer by bolts, pins, rivets and the like. The rear panel is provided with a vent hole for releasing the gas in the bag and restraining the occupant softly when the driver's seat occupies the airbag.

In JP-A-7-232607, a circular inner panel (referred to as “inner cloth” in the same publication) is provided so as to span between an inflator opening of a rear panel and a front panel, and air. An airbag in which a bag is partitioned into a central first chamber and a surrounding second chamber is described. The circular inner fabric has an outer peripheral edge sewn near the radial middle portion of the rear panel, and a central portion sewn near the central portion of the front panel. The inner cloth is provided with a communication port for communicating the first chamber and the second chamber. When the inflator is activated, the first chamber first expands, and then the second chamber expands.
Japanese Patent Laid-Open No. 7-232607

  The present invention relates to an airbag whose interior is partitioned into a central first chamber and a surrounding chamber surrounding the first chamber, and an airbag in which expansion in the diametrical direction is accelerated, and an airbag apparatus including the airbag The purpose is to provide.

  Further, according to one aspect of the present invention, there is provided an airbag in which one half side in the diameter direction of the airbag is inflated earlier than the other half side in the middle of inflation of the airbag, and an airbag apparatus including the airbag. The purpose is to do.

  The airbag according to claim 1 includes a front panel disposed on the occupant side and a rear panel disposed on the opposite side of the occupant, and the front panel and the rear panel are coupled to each other at their peripheral portions. An opening for the gas generator is provided at the center of the air bag, and an inner panel that divides the inside of the airbag into a central first chamber and a surrounding chamber surrounding the first chamber is disposed, and the front side of the inner panel The peripheral portion divides the peripheral chamber into a second chamber on the rear side and a third chamber on the front side in an airbag coupled to an intermediate portion between the central portion and the peripheral portion of the front panel. A separate panel is provided, an outer peripheral edge of the separate panel is coupled to the rear panel, an opening is provided in the separate panel, and the inner panel is inserted through the opening; At least a part of the edge of the mouth and the inner panel are disconnected, the inner panel is provided with a first communication port that communicates the first chamber and the second chamber, and the separate panel has the A second communication port for communicating the second chamber and the third chamber is provided.

  According to a second aspect of the present invention, the airbag according to the first aspect is characterized in that a vent hole that communicates the second chamber or the third chamber with the outside of the airbag is provided.

  The airbag according to claim 3 is the airbag according to claim 1 or 2, wherein the volume of the second chamber in the one half side of the airbag in the radial direction of the airbag is in the other half of the airbag in the radial direction of the airbag. It is characterized by being larger than the volume.

  An airbag according to a fourth aspect is characterized in that, in the third aspect, an opening is provided on the other half side from the center of the separate panel, and the inner panel is inserted through the opening.

  The airbag according to claim 5 is characterized in that, in claim 4, the outer peripheral edge of the separate panel is coupled to the outer peripheral side of the rear panel in one half of the airbag rather than in the other half. Is.

  According to a sixth aspect of the present invention, the airbag according to any one of the first to fifth aspects is characterized in that a hanging strap is provided to connect the separate panel and the rear panel.

  The airbag device according to claim 7 is an airbag device including an airbag and a gas generator for inflating the airbag, wherein the airbag is the airbag according to any one of claims 1 to 6. It is characterized by being.

  In the airbag and the airbag apparatus of the present invention, when the gas generator starts the gas generation operation, first, the first chamber at the center in the radial direction is expanded, and the gas flows into the second chamber from the first chamber. The second chamber expands, gas flows from the second chamber into the third chamber, and the third chamber expands.

  In the initial stage of inflation of the airbag, a large amount of gas is supplied from the gas generator into the first chamber, and the internal pressures of the surrounding second chamber and third chamber are still low. Is inflated to become thicker in the diameter direction of the airbag. For this reason, the gap between the outer surface of the inner panel surrounding the first chamber and the inner peripheral edge of the opening of the separate panel is reduced, or the outer surface of the inner panel is pressed against the inner peripheral edge of the opening to close the gap. Become so.

  For this reason, the outflow of gas from the gap to the third chamber is suppressed, and gas tends to stay in the second chamber. The second chamber quickly becomes a high internal pressure, and the second chamber quickly has the diameter of the airbag. Spread out in the direction. As a result, the airbag is deployed widely in an early stage.

  When the gas in the second chamber flows into the third chamber through the second communication port, the third chamber expands. Thus, the gas from the first chamber to the second chamber, and further to the third chamber. As a result, the internal pressure of the second chamber and the third chamber rises accordingly, and the thickness of the first chamber in the diameter direction of the airbag is reduced. As a result, the inner panel is separated from the inner peripheral edge of the opening of the separate panel, and a gap is formed between them or the gap becomes larger than the initial stage of inflation of the airbag. As a result, a larger amount of gas flows into the third chamber through both the second communication port and the gap than in the initial stage of inflation of the airbag, and the expansion of the third chamber is promoted.

  In the airbag according to claim 2, when an occupant hits the inflated airbag, gas flows out from the second chamber or the third chamber through the vent hole, and the occupant is softly restrained.

  In the airbag according to the third aspect, one half side of the second chamber is inflated earlier than the other half side.

  The airbag is installed on the steering wheel so that the half side is the lower side of the steering wheel. When the airbag is inflated, the one half side of the second chamber is quickly inflated between the lower part of the steering wheel and the chest of the occupant to restrain the occupant's chest.

  If the occupant hits the other half side of the airbag in the stage before the inflation of the airbag as a whole, the gas on the one half side in the airbag moves to the other half side, and the other half side rapidly Inflates and catches the occupant's face. Note that the chest is softly restrained by the airbag as the gas moves from the one half side to the other half side.

  In the airbag according to the fourth aspect, since the first chamber is disposed on the other half side of the second chamber, the volume of the one half side of the second chamber is larger than that of the other half side.

  In the airbag according to claim 5, one half side of the outer peripheral edge of the separate panel is connected to the outer peripheral side of the rear panel rather than the other half side, whereby the volume of the half side of the second chamber is increased. It will be larger than the other half.

  In the airbag of the sixth aspect, the separate panel and the rear panel are connected by the hanging strap, and the volume of the second chamber can be regulated.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are sectional views of a driver's seat airbag and airbag device according to an embodiment, FIG. 3 is an exploded perspective view of the airbag and airbag device, and FIG. 4 (a). FIG. 4 is a sectional view taken along line IVA-IVA in FIG. 1, and FIG. 4B is a sectional view taken along line IVB-IVB in FIG. FIGS. 1 and 4 (a) show an initial stage of inflation of the airbag, and FIGS. 2 and 4 (b) show a state where the inflation of the airbag is completed.

  The airbag 10 includes a front panel 12, a rear panel 14, a first inner panel 22A, a second inner panel 22B, and a separate panel 60 each made of a circular woven fabric. The front panel 12 and the rear panel 14 have the same diameter, and are formed into a bag shape by stitching the outer peripheral edges with a seam 15 made of a thread or the like. The stitched portion has an annular shape that circulates along the outer peripheries of the front panel 12 and the rear panel 14.

  The rear panel 14 is provided with an inflator (gas generator) opening 16 and a vent hole 18. The inflator opening 16 is disposed at the center of the rear panel 14. A bolt insertion hole 20 is provided around the inflator opening 16.

  The first inner panel 22A and the second inner panel 22B are provided near the center of the interior of the airbag 10. The first and second inner panels 22A and 22B are arranged substantially concentrically with the front panel 12 and the rear panel 14, and their outer peripheral edges are stitched together by a seam 23B made of a thread or the like. The inner peripheral edge portion of the first inner panel 22A on the front panel 12 side (the peripheral edge portion on the front end side of the inner panel 22A when the airbag 10 is inflated) is formed between the center portion and the peripheral edge portion of the front panel 12. The intermediate portion is sewn with a seam 23A made of a thread or the like.

  In the central portion of the second inner panel 22B on the rear panel 14 side (the portion on the rear end side of the second inner panel 22B when the airbag 10 is inflated), the inflator opening 16 of the rear panel 14 and An inflator opening 24 arranged substantially concentrically is provided. These openings 16 and 24 have substantially the same diameter. A bolt insertion hole 26 that overlaps the bolt insertion hole 20 of the rear panel 14 is provided around the opening 24 of the inner panel 22B.

  The peripheral portion of the inflator opening 24 of the second inner panel 22B is overlapped with the peripheral portion of the inflator opening 16 of the rear panel 14, and is overlapped with the peripheral portion of the inflator mounting port 32 of the retainer 30. The peripheral portions of the inflator openings 24 and 16 are fixed to the retainer 30 through the bolt insertion holes 26 and 20. Thus, the peripheral edge of the inflator opening 24 of the second inner panel 22B is connected to the peripheral edge of the inflator opening 16 of the rear panel 14, and the outer peripheral edges of the first and second inner panels 22A, 22B are connected to each other. The inner peripheral edge portion of the inner panel 22 </ b> A is continuous with the front panel 12.

  By the first and second inner panels 22A and 22B, the interior of the airbag 10 is divided into a central first chamber 1 and surrounding chambers (second chamber 2 and third chamber 3) surrounding the first chamber 1. Is done. The first chamber 1 is inside the inner panels 22A and 22B.

  The second inner panel 22 </ b> B is provided with a first communication port 27 that communicates the first chamber 1 and the second chamber 2. In this embodiment, the first communication port 27 is formed on an extension line in a gas ejection direction of an inflator 36 described later, that is, at a position facing a gas ejection port 36 a of the inflator 36. As shown in FIG. 3, in this embodiment, four first communication ports 27 are provided at equal intervals in the circumferential direction of the airbag. However, the number and arrangement of the first communication ports 27 are not limited to this.

  The separate panel 60 is provided with an opening 61 through which a connecting body of the first inner panel 22A and the second inner panel 22B is inserted, and a second communication port 62. In this embodiment, as shown in FIG. 3, the opening 61 is provided near the center of the separate panel 60.

  The separate panel 60 is disposed substantially concentrically with the rear panel 14, and an outer peripheral edge thereof is sewn to the rear panel 14 by a seam 63. The edge of the opening 61 is not connected to the inner panels 22A and 22B.

  The separate panel 60 divides the surrounding chamber surrounding the first chamber 1 into a second chamber 2 on the rear side and a third chamber 3 on the front side. The first communication port 27 communicates the first chamber 1 and the second chamber 2. The second communication port 62 communicates the second chamber 2 and the third chamber 3.

  A reinforcing patch or the like may be attached to the peripheral portions of the openings 16, 24, 61, the communication ports 27, 62, and the vent hole 18.

  The retainer 30 for attaching the airbag 10 is provided with an inflator attachment port 32 at the center and a bolt insertion hole 34 around the inflator attachment port 32.

  The inflator 36 has a substantially cylindrical shape, and a gas outlet 36a is provided on the side peripheral surface on the distal end side in the cylinder axis direction. In this embodiment, four gas outlets 36 a are provided at equal intervals in the circumferential direction of the inflator 36. The inflator 36 is configured to eject gas in a radial direction from these gas ejection ports 36a. A flange 38 for fixing an inflator projects from a side peripheral surface of the midway portion of the inflator 36 in the cylinder axis direction (the rear end side of the gas jet port 36a). The flange 38 is provided with a bolt insertion hole 40. The tip side of the inflator 36 is fitted into the inflator attachment port 32 of the retainer 30.

  In attaching the airbag 10 to the retainer 30, the peripheral portions of the inflator openings 16, 24 of the rear panel 14 and the second inner panel 22B are pressed against the peripheral portion of the inflator mounting port 32 of the retainer 30 by the press ring 42. . The front end side of the inflator 36 fitted in the inflator attachment port 32 is inserted into the first chamber 1 through the inflator openings 16 and 24. The gas outlets 36a provided on the front end side of the inflator 36 face the communication ports 27 of the second inner panel 22B, respectively.

  At this time, the stud bolt 44 of the presser ring 42 is passed through the bolt insertion holes 26, 20, 34, and 40, and the nut 46 is tightened at the tip thereof, so that the second inner panel 22 </ b> B, the airbag 10, and the inflator 36 are retained. To fix. And the airbag apparatus is comprised by folding the airbag 10 and attaching the module cover 48 to the retainer 30 so that the folding body of this airbag 10 may be covered. This airbag device is installed on a steering wheel 50 of an automobile.

  In the event of a vehicle collision or the like, the inflator 36 is activated and gas is ejected into the airbag 10. The airbag 10 is inflated by this gas, pushes the module cover 48 open, expands in the vehicle compartment, and restrains the driver's seat occupant.

  When the inflator 36 is activated, the gas from the inflator 36 is supplied into the first chamber 1 and the first chamber 1 is first expanded. Since the volume of the first chamber 1 is smaller than the entire volume of the airbag 10, the first chamber 1 is rapidly expanded by the gas from the inflator 36.

  At this time, a large amount of gas is supplied from the inflator 36 into the first chamber 1, and the internal pressure of the surrounding second chamber 2 and third chamber 3 is still low at the initial stage of inflation of the airbag 10. Accordingly, the first chamber 1 is inflated so as to become thicker in the diameter direction of the airbag 10 as shown in FIG. Therefore, as shown in FIG. 4A, the gap between the outer surface of the inner panel 22A or 22B surrounding the first chamber 1 and the inner peripheral edge of the opening 61 of the separate panel 60 is reduced, or the inner panel. The outer surface of 22A or 22B is pressed against the inner peripheral edge of the opening 61 to close the gap.

  As the gas in the first chamber 1 flows into the second chamber 2 through the first communication port 27, the second chamber 2 expands. At this time, as described above, the gap between the outer surface of the inner panel 22A or 22B and the inner peripheral edge of the opening 61 is small or closed, and the outflow of gas from the gap to the third chamber 3 is prevented. Since the gas is likely to stay in the second chamber 2 by being suppressed, the inside of the second chamber 2 quickly becomes a high internal pressure, and the second chamber 2 quickly moves from the center side of the airbag 10 toward the outer peripheral side. Spread out. As a result, the airbag 10 is deployed over a wide range in an early stage.

  In this embodiment, the first communication port 27 that communicates the first chamber 1 and the second chamber 2 has a gas ejection direction from the gas ejection port 36 a of the inflator 36 disposed in the first chamber 1. When the inflator 36 is operated, the gas from the gas outlet 36a is directly supplied to the second chamber 2 through the first communication port 27. This also promotes expansion of the second chamber 2.

  When the gas in the second chamber 2 flows into the third chamber 3 through the second communication port 62, the third chamber 3 expands.

  At this time, gas flows out from the first chamber 1 to the second chamber 2, and further to the third chamber 3, and the internal pressure in the second chamber 2 and the third chamber 3 increases accordingly. As shown in FIG. 2 and FIG. 4B, the thickness of the first chamber 1 in the diameter direction of the airbag 10 is reduced. As a result, the inner panel 22A or 22B is separated from the inner peripheral edge of the opening 61, and a gap is formed between them or the gap becomes larger than the initial stage of inflation of the airbag 10. As a result, a larger amount of gas flows into the third chamber 3 through both the second communication port 62 and the gap than in the initial stage of inflation of the airbag 10, and the third chamber 3 is inflated. Promoted.

  In the airbag 10, the front panel 12 is connected to the rear panel 14 side by the inner panels 22 </ b> A and 22 </ b> B, so that the airbag 10 is prevented from excessively expanding toward the passenger.

  When an occupant rushes into the inflated airbag 10, the occupant is softly restrained by gas flowing out of the airbag 10 from the vent hole 18.

  FIG. 5 is a sectional view of a driver's seat airbag and airbag device according to another embodiment, FIG. 6 is an exploded perspective view of the airbag and airbag device, and FIG. It is a top view. In FIG. 7, the illustration of the front panel of the airbag is omitted.

  The airbag 10A of this embodiment is also partitioned into a central first chamber 1 and surrounding chambers (second chamber 2 and third chamber 3) by the inner panels 22A and 22B. The peripheral chamber is divided into a second chamber 2 on the rear side and a third chamber 3 on the front side by a separate panel 60A.

  As shown in FIGS. 5 and 6, in this embodiment, the second inner panel 22B is relatively close to the inner peripheral edge thereof (the gas outlet of the inflator 36 disposed in the first chamber 1). A first communication port 27 is provided (as opposed to 36 a), and an inner vent hole 28 is provided on the outer peripheral side of the first communication port 27. The inner vent hole 28 may be provided in the first inner panel 22A.

  Also in this embodiment, as shown in FIG. 6, four first communication ports 27 are provided at equal intervals in the circumferential direction of the airbag 10A. Four inner vent holes 28 are also provided at equal intervals in the circumferential direction of the airbag 10A. The first communication port 27 and the inner vent hole 28 are out of phase in the circumferential direction with respect to the center of the airbag 10A. However, the number and arrangement of the first communication port 27 and the inner vent hole 28 are not limited to this.

  In this embodiment, as shown in FIG. 7, the separate panel 60A is arranged at a position where the center is shifted to the lower half side (lower half side in FIG. 7) from the center of the airbag 10A. The peripheral edge portion is coupled to the outer peripheral side of the rear panel 14 on the lower half side of the airbag 10A rather than on the upper half side. Accordingly, the volume of the second chamber 2 on the lower half side of the airbag 10 is larger than the volume on the upper half side.

  In this embodiment, a hanging strap 64 that connects the separate panel 60 </ b> A and the rear panel 14 is provided on the lower half side in the second chamber 2. Reference numerals 65 </ b> A and 65 </ b> B denote seams in which both ends of the hanging strap 64 are connected to the separate panel 60 </ b> A and the rear panel 14.

  Other configurations of the airbag 10A and the airbag apparatus including the airbag 10A are the same as those in the embodiment shown in FIGS. 1 to 4 described above, and are the same as those shown in FIGS. 1 to 4 in FIGS. The code | symbol has shown the identical part.

  In the airbag apparatus of this embodiment, the lower half side of the airbag 10 </ b> A is installed as a lower side of the steering wheel 50 with respect to the steering wheel 50 of an automobile.

  Also in this embodiment, when the inflator 36 starts the gas generation operation, the first chamber 1 is first expanded, the gas flows from the first chamber 1 into the second chamber 2, and the second chamber 2 expands. Gas flows from the second chamber 2 into the third chamber 3 and the third chamber 3 expands.

  Even in the airbag 10A, as in the airbag 10 of FIGS. 1 to 4, in the initial stage of inflation of the airbag 10A, the outer surface of the inner panel 22A or 22B and the inner peripheral edge of the opening 61 of the separate panel 60A The gap between the first and second chambers is small or closed, and the outflow of gas from the gap to the third chamber 3 is suppressed, and the gas tends to stay in the second chamber 2. The inside of the two chambers 2 quickly becomes a high internal pressure, and the second chamber 2 quickly spreads from the center side of the airbag 10A toward the outer peripheral side.

  In the airbag 10A, since the volume of the second chamber 2 on the lower half side of the airbag 10A is larger than the volume on the upper half side, the lower half side of the airbag 10A is quickly steered. It expands between the lower part of the wheel and the chest of the occupant to restrain the occupant's chest.

  When the occupant chest hits the vicinity of the second chamber 2 when the airbag 10A is in the middle of inflation, the gas in the second chamber 2 flows out to the third chamber 3 through the second communication port 62 and the opening 61, The occupant's chest is restrained softly and the expansion of the third chamber 3 is promoted. The expanded third chamber 3 receives the occupant's head and the like together with the first chamber 1. At this time, the gas in the airbag 10A flows out through the vent hole 18, so that the occupant is restrained by the airbag 10A softer.

  In the airbag 10A, as described above, the second chamber 2 inflated prior to the third chamber 3 receives an occupant and gas flows out from the second chamber 2 to the third chamber 3, thereby Since the expansion of the three chambers 3 is promoted, even when a relatively low-power inflator is used, the passengers can be restrained by efficiently expanding the respective chambers.

  In this embodiment, since the separate panel 60A and the rear panel 14 are connected by the hanging strap 64, the volume of the second chamber 2 during expansion is restricted. Thereby, the excessive swelling to the passenger | crew side of the 2nd chamber 2 is prevented. In this embodiment, the hanging strap 64 is coupled to the separate panel 60A and the rear panel 14 by sewing (seams 65A and 65B), but may be coupled by other coupling means such as adhesion or welding. Good. The hanging strap 64 may be integrated with the separate panel 60A or the rear panel 14 by weaving or the like.

  The above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment.

  For example, in each of the above embodiments, four gas ejection ports 36a and first communication ports 27 are provided, but the number is not limited to four. Further, in each of the above embodiments, the first communication port 27 is arranged in the extending direction of the gas jet port direction of all the gas jet ports 36a of the inflator 36, but the gas jet ports of some of the gas jet ports 36a The first communication port 27 may be arranged only in the extending direction. In addition, a part of the communication ports may be disposed at a position deviating from the extending direction of the gas jet port 36a, and there may be a communication port that does not face the gas jet port 36a.

  In the present invention, a rectifying cloth for guiding the gas from the inflator so as to guide it to the first communication port 27 may be provided in the first chamber 1.

  In addition, by adjusting and changing the opening area and arrangement of the first communication port 27, the internal pressure of each chamber in the initial stage of inflation of the airbag 10, 10A, the inflation timing of each chamber, and the like can be adjusted.

  For example, since the amount of gas directly supplied from the inflator into the second chamber 2 is increased by setting the opening area of the first communication port 27 to be large, The internal pressure can be made equal to or higher than the internal pressure of the first chamber 1.

  Further, in this case, as the second chamber 2 expands, the opening 61 is sufficiently widened by the tension acting on the separate panels 60 and 60A, and the gap between the opening 61 and the outer surfaces of the inner panels 22A and 22B. Becomes larger. As a result, the gas in the second chamber quickly flows out to the third chamber 3 through both the second communication port 62 and the gap, so that the third chamber 3 expands quickly.

  On the other hand, by setting the opening area of the first communication port 27 to be small, or by disposing a part of the communication ports 27 from the extension direction of the gas ejection direction from the gas ejection port of the inflator, The amount of gas directly supplied into the chamber 2 is restricted, and the internal pressure of the second chamber 2 becomes low. In this case, since the tension acting on the peripheral edge of the opening 61 is relatively small, the gap between the opening 61 and the outer surfaces of the inner panels 22A and 22B becomes small. The amount of gas flowing into the water is also reduced. As a result, the internal pressure of the third chamber 3 is also low.

It is sectional drawing which shows the stage of the airbag expansion | deployment initial stage of the airbag which concerns on embodiment, and an airbag apparatus. It is sectional drawing which shows the state which the airbag expansion | swelling of the airbag of FIG. 1 and the airbag apparatus was completed. It is a disassembled perspective view of the airbag and airbag apparatus of FIG. It is sectional drawing which follows the IVA-IVA line | wire and IVB-IVB line | wire of FIG. It is sectional drawing of the airbag and airbag apparatus which concern on another embodiment. It is a disassembled perspective view of the airbag and airbag apparatus of FIG. FIG. 3 is a plan view of the airbag of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st chamber 2 2nd chamber 3 3rd chamber 10, 10A Air bag for driver's seat 12 Front panel 14 Rear panel 16, 24 Opening for inflator 18 Vent hole 22A First inner panel 22B Second inner panel 27 First communication port 28 Inner vent hole 30 Retainer 32 Inflator mounting port 36 Inflator 36a Gas outlet 42 Presser ring 60, 60A Separate panel 61 Opening 62 Second communication port

Claims (7)

It has a front panel arranged on the occupant side and a rear panel arranged on the side opposite to the occupant, and the front panel and the rear panel have their peripheral parts joined together,
An opening for the gas generator is provided in the center of the rear panel,
An inner panel that divides the inside of the airbag into a central first chamber and a surrounding chamber surrounding the first chamber is disposed,
In the airbag connected to the intermediate portion between the center portion and the peripheral portion of the front panel, the front end side peripheral portion of the inner panel is
A separate panel is provided for partitioning the surrounding chamber into a second chamber on the rear side and a third chamber on the front side;
The outer peripheral edge of the separate panel is coupled to the rear panel,
An opening is provided in the separate panel, and the inner panel is inserted through the opening,
At least a part of the edge of the opening and the inner panel are disconnected,
A first communication port for communicating the first chamber and the second chamber is provided in the inner panel;
An air bag characterized in that a second communication port for communicating the second chamber and the third chamber is provided in the separate panel.   2. The airbag according to claim 1, further comprising a vent hole that communicates the second chamber or the third chamber with the outside of the airbag.   3. The volume of the second chamber in the airbag radial direction in the second chamber is larger than the volume in the airbag radial other half in the state in which the airbag is inflated. Air bag to do.   4. The airbag according to claim 3, wherein an opening is provided on the other half side of the center of the separate panel, and the inner panel is inserted through the opening.   5. The airbag according to claim 4, wherein the outer peripheral edge of the separate panel is coupled to the outer peripheral side of the rear panel at one half of the airbag rather than at the other half.   The airbag according to any one of claims 1 to 5, further comprising a hanging strap that connects the separate panel and the rear panel. In an airbag device comprising an airbag and a gas generator for inflating the airbag,
The airbag device according to any one of claims 1 to 6, wherein the airbag is the airbag device.

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