JP6143542B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device that inflates and deploys to protect an occupant when a vehicle collides, and more particularly, to a diffuser that regulates the flow of gas supplied into the airbag.

  Patent document 1 is disclosing the airbag provided with the diffuser which controls the flow of the gas injected from an inflator. In Patent Document 1, the diffuser is formed of a cylindrical cloth material. A gas insertion hole corresponding to the gas inlet of the airbag is provided on the peripheral surface of the diffuser, and a through-hole through which each bolt of the retainer can be inserted is provided at the periphery of the gas insertion hole. In addition, a retainer is disposed at the periphery of the gas insertion hole on the inner peripheral side of the diffuser, and each bolt of the retainer is fastened with a nut to the bag holder through the through hole and the attachment hole of the airbag.

  A similar configuration is disclosed in Patent Document 2.

Japanese Patent Laid-Open No. 10-1000083 International Publication No. 1997/036768

  However, with the technique disclosed in Patent Document 1 or the like, it is difficult for the diffuser to maintain a certain shape when the diffuser formed by the cylindrical cloth material receives the ejected gas.

  Accordingly, an object of the present invention is to stabilize the state of a diffuser that regulates the flow of gas supplied into an airbag.

In order to solve the above-described problem, an airbag device according to a first aspect includes an inflator capable of generating gas and an inflator mounting hole in which the inflator is mounted in a state where gas can be supplied therein. An airbag that can be inflated and deployed by the supplied gas; a fixing member that is provided in a peripheral portion of the inflator mounting hole in the airbag and that fixes the inflator; and both ends of the inflator are mounted by the fixing member A diffuser fixed to the peripheral edge of the hole and restricting the flow of gas supplied from the inflator in the airbag, the diffuser being formed by a long sheet-like member, and its longitudinal direction In each of both ends, the side parts on both sides in the short direction are directed toward the center in the short direction. Returned, the side portions are arranged so that they do not overlap each other, and the edge portions of the side portions are arranged along the center line in the short direction, and both ends in the longitudinal direction are fixed to the inflator by the fixing member. The air bag is disposed in the airbag and is mounted in the inflator mounting hole in such a state that the entire side is straddling the inflator mounting hole and the folded back side portions face the inflator mounting hole side. When gas is ejected from the gas ejection holes of the inflator arranged inside, each side part opens at the part from the longitudinal direction both ends of the diffuser toward the longitudinal direction central part, and the cylindrical or one side part opens. The gas reservoir is formed in a semi-cylindrical shape .

A 2nd aspect is an airbag apparatus which concerns on a 1st aspect, Comprising: The longitudinal direction intermediate part of the said diffuser is formed narrowly.

  According to the airbag apparatus according to the first aspect, in a state where gas is supplied into the airbag and the flow of gas is regulated by the diffuser, gas reservoirs are formed at both end portions of the diffuser. It has become. As a result, both end portions of the diffuser are easily maintained in a certain shape, and the state of the diffuser that restricts the flow of the gas supplied into the airbag can be stabilized.

According to the first aspect, the gas reservoir forming portion can be provided in the diffuser itself without performing special processing for forming the gas reservoir forming portion.

According to the 1st aspect, simplification of the structure which fixes an inflator and a diffuser to an airbag can be achieved.

According to the first aspect, the gas supplied from the inflator maintains both ends of the diffuser so as to form a cylindrical or semi-cylindrical shape along the extending direction. It is possible to stabilize the state of the diffuser that regulates the flow of gas.

According to the first aspect, the gas reservoir forming part can be easily formed.

According to the second aspect, the material for forming the diffuser can be reduced.

According to the first aspect, the pair of gas reservoir forming portions provided in each of the both end portions of the diffuser makes it easier to maintain the both end portions of the diffuser in a certain shape.

According to the 1st aspect, a pair of gas reservoir formation part can be formed easily.

According to the first aspect, since the gas flows from between the side edges of the pair of gas reservoir formation portions, the gas reservoir portion can be more reliably formed with a simpler configuration. .

It is sectional drawing which shows the whole structure of the airbag apparatus which concerns on 1st Embodiment. It is a perspective view which shows the diffuser of an airbag apparatus same as the above. It is a perspective view which shows the diffuser of an airbag apparatus same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is sectional drawing which shows the whole structure of the airbag apparatus which concerns on 2nd Embodiment. It is a perspective view which shows the diffuser of an airbag apparatus same as the above. It is a perspective view which shows the diffuser of an airbag apparatus same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows the procedure which forms a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is explanatory drawing which shows the state before the installation of the diffuser integrated in the airbag apparatus which concerns on 3rd Embodiment. It is a figure which shows the state which attached the diffuser same as the above to the cushion ring. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is an expanded view which shows a sheet-like member in order to form the diffuser integrated in the airbag apparatus which concerns on 4th Embodiment. It is a figure which shows the state which attached the diffuser same as the above to the cushion ring. It is explanatory drawing which shows operation | movement of a diffuser same as the above. It is a perspective view which shows the diffuser integrated in the airbag apparatus which concerns on 5th Embodiment. It is an expanded view which shows the sheet-like member for forming a diffuser same as the above.

{First embodiment}
Hereinafter, the airbag apparatus according to the first embodiment will be described. FIG. 1 is a cross-sectional view showing an overall configuration of an airbag apparatus 20 according to the present embodiment, and FIGS. 2 and 3 are perspective views showing a diffuser 40 of the airbag apparatus 20. 1 and 2 show a state in which gas is supplied from the inflator, and FIG. 3 shows an initial state before the gas is supplied from the inflator 22.

<Overall configuration of airbag device>
The airbag device 20 is configured as a device that is incorporated in front of a passenger seat of a vehicle, inflates and deploys in front of the passenger at the time of a vehicle collision, etc., receives the passenger and absorbs an impact. As an application part of this airbag apparatus 20, the instrument panel etc. in the cover in the center part of the steering wheel ahead of a driver's seat, a front passenger seat, etc. are assumed, for example.

  A more specific description will be given on the assumption that the airbag device 20 is incorporated in a cover at the center of the steering wheel. The cover is a panel-like member formed of resin or the like, and a groove-like tear line is formed on the inner surface of the cover. The airbag device 20 is incorporated inside the main cover with the airbag 30 folded. When the airbag device 20 is activated, the cover is torn along the tear line due to the inflating and deploying force of the airbag 30, thereby forming an opening in the cover. The airbag 30 is inflated and deployed toward the outside (occupant side) of the cover through an opening formed in the cover, and is in a state in which the occupant can be received.

  The airbag device 20 includes an inflator 22, an airbag 30, and a diffuser 40.

  The inflator 22 includes an ignition device, a gas generating agent, and the like. The inflator 22 receives an ignition command signal from a vehicle impact detection unit and the like, and ignites the ignition device. Is generated.

  More specifically, the inflator 22 includes an inflator main body portion 23 and a flange portion 24.

  The inflator main body 23 has a short cylindrical outer shape, and an ignition device, a gas generating agent, and the like are accommodated therein. A plurality of gas ejection holes 23h are formed on the outer periphery of a portion of the inflator main body 23 that protrudes toward the one main surface side of the flange portion 24 (portion disposed in the airbag 30).

  A flange portion 24 is formed on the outer periphery of the intermediate portion in the axial direction of the inflator main body portion 23. A bolt insertion hole 24 h is formed at a position corresponding to a bolt 35 described later in the collar portion 24. In addition, the collar part 24 may be a planar plate shape or a square plate shape.

  The airbag 30 is formed in a bag shape in which an inflator mounting hole 32h is formed. The inflator 22 is attached to the inflator attachment hole 32h in a state where gas can be supplied into the airbag 30. The airbag 30 can be inflated and deployed in a bag shape by the gas supplied from the inflator 22.

  More specifically, the airbag 30 is formed in a bag shape having an inflator mounting hole 32h by a flexible sheet-like member such as a cloth or a resin sheet. The inflated and deployed shape of the airbag 30 may be a disk-like bag shape, or may be a bag shape that is long in a predetermined direction such as a spheroidal shape. The inflation and deployment shape of the airbag 30 is set to a shape that can effectively receive the impact of the occupant in consideration of the location where the airbag 30 is installed, the positional relationship between the installation location and the occupant, and the like. Is done.

  The inflator 22 is attached to the inflator attachment hole 32h of the airbag 30 at a position and posture capable of supplying gas into the airbag 30. The airbag 30 is disposed inside the cover in a folded state in a normal state. The airbag 30 may be folded in a bellows shape or may be folded in a roll shape. In the event of a vehicle collision or the like, the air bag 30 is opened by the gas supplied from the inflator 22 so that the cover opens and protrudes out of the cover, and expands in a bag shape toward the passenger side, which is the passenger compartment side. It has come to expand.

  The diffuser 40 is formed in a long shape by a flexible sheet-like member such as a cloth or a resin sheet. The diffuser 40 is provided in the airbag 30 by fixing both ends of the diffuser 40 to the periphery of the inflator mounting hole 32 h in the airbag 30. Here, both end portions of the diffuser 40 are fixed to two positions sandwiching the center of the inflator mounting hole 32h in the peripheral portion of the inflator mounting hole 32h. In other words, in a state where the diffuser 40 straddles the inflator attachment hole 32h from the inside of the airbag 30, both end portions of the diffuser 40 are fixed to the peripheral portion of the inflator attachment hole 32h.

  In the initial state, the diffuser 40 is folded so as to be accommodated in the folded airbag 30. Although FIG. 3 shows a state where the diffuser 40 is folded into a flat state, it may be folded into a bellows shape or a roll shape.

  When gas is generated in the inflator 22, the gas is ejected from the gas ejection holes 23 h on the outer periphery of the portion of the inflator 22 disposed in the airbag 30, and this gas is supplied into the airbag 30. Thereby, the airbag 30 is inflated and deployed. At this time, the diffuser 40 is provided so as to straddle the inflator attachment hole 32 h from the inside of the airbag 30, that is, straddle the inflator 22 from the inside of the airbag 30. For this reason, part of the gas supplied from the inflator 22 also flows inside the diffuser 40. Thereby, the diffuser 40 protrudes so as to form a C shape when viewed from the side orthogonal to the direction connecting the both end portions (see FIG. 1). In this state, a part of the gas supplied from the inflator 22 flows into the diffuser 40, and the gas flow is regulated by the diffuser 40. For example, the flow of gas is regulated so that the gas does not flow vigorously in the inflating and deploying direction of the airbag 30 (the direction facing the inflator 22).

  The said inflator 22 is being fixed to the peripheral part of the inflator attachment hole 32h among the airbags 30, This fixed structure example is demonstrated.

  In other words, the airbag device 20 includes the cushion ring 34 as a fixing member for fixing the inflator 22 to the peripheral portion of the inflator mounting hole 32 h in the airbag 30.

  The cushion ring 34 is a member formed by pressing a metal plate or the like, and is formed in a plate shape having an opening having the same shape as the inflator mounting hole 32h. Here, the outer shape of the cushion ring 34 is a square shape, but may be a circular shape. Further, the outer peripheral edge portion of the cushion ring 34 is bent so as to face the inside of the airbag 30.

  On one main surface of the cushion ring 34 (surface opposite to the direction in which the outer peripheral edge protrudes), a bolt 35 is projected as a fixing rod-shaped member. The bolts 35 are provided at positions corresponding to the four corner portions of the cushion ring 34.

  Further, bolt insertion holes 32ha corresponding to the respective bolts 35 are formed in the peripheral portion of the inflator mounting hole 32h in the airbag 30.

  Furthermore, the fixed panel 38 is arrange | positioned in the outer side position of the peripheral part of the inflator attachment hole 32h among the airbags 30 (refer FIG. 1). The fixed panel 38 is a member that is fixed to, for example, a spoke portion of the steering wheel, and is a portion that fixes and supports the airbag device 20 with respect to the vehicle. The fixed panel 38 is formed by pressing a metal plate or by a resin plate or the like. The fixed panel 38 is also formed with an opening having the same shape as the inflator mounting hole 32h and a bolt insertion hole 38h corresponding to each bolt 35.

  And the cushion ring 34 is arrange | positioned so that it may overlap from the airbag 30 inner side with respect to the peripheral part of the inflator attachment hole 32h. Further, the fixing panel 38 and the flange portion 24 of the inflator 22 are arranged in this order so as to overlap the peripheral portion of the inflator attachment hole 32h from the outside of the airbag 30. In this overlapped state, the bolt 35 of the cushion ring 34 is arranged so as to pass through the bolt insertion hole 32ha at the peripheral edge of the inflator mounting hole 32h, the bolt insertion hole 38h of the fixing panel 38, and the bolt insertion hole 24h of the collar 24. Established. When the nut 36 is screwed to the head of the bolt 35 protruding from the collar portion 24, the peripheral portion of the inflator mounting hole 32 h is sandwiched between the cushion ring 34 and the collar portion 24. It becomes. That is, the airbag 30 and the inflator 22 are fixed by the sandwiching structure and the structure in which the bolt 35 is inserted into the bolt insertion hole 32ha at the peripheral portion of the inflator attachment hole 32h. Instead of the bolts 35 and the nuts 36, a configuration may be adopted in which a fixing rod-shaped member is provided protruding from the cushion ring 34 and another fixing member is caulked or fixed to the fixing rod-shaped member. .

  In the present embodiment, the diffuser 40 is also fixed to the peripheral portion of the inflator mounting hole 32 h by the cushion ring 34. This fixing structure will be described later. But it is not essential that a diffuser is fixed to the peripheral part of an inflator attachment hole with a cushion ring. For example, the diffuser may be fixed to the peripheral portion of the inflator mounting hole by another fixing structure such as sewing.

<About the diffuser>
The diffuser 40 will be described in more detail. 4-8 is explanatory drawing which shows the procedure in which the diffuser 40 is formed. As shown in FIGS. 1-8, the diffuser 40 is a member formed in the elongate shape by flexible sheet-like members, such as cloth and a resin sheet. A gas reservoir forming portion 46 capable of forming a gas reservoir portion 46 </ b> A by a gas supplied from the inflator 22 into the airbag 30 is provided at both end portions of the diffuser 40.

  The gas reservoir 46A receives the gas supplied from the inflator 22 and flows along the inside of the diffuser 40, thereby temporarily storing the gas and expanding itself by the temporarily accumulated gas pressure. This is the part that tries to maintain the expanded state. The gas reservoir forming portion 46 is a portion capable of forming a vessel-shaped portion that forms a space for storing such gas. Here, the gas reservoir forming portion 46 is configured to be able to form a cylindrical or semi-cylindrical gas reservoir portion 46 </ b> A extending along the extending direction of both end portions of the diffuser 40 by the gas supplied from the inflator 22. ing.

  More specifically, the diffuser 40 is formed by a long sheet-like member 40B (see FIG. 4). Here, the sheet-like member 40B is formed in a narrow strip shape having a uniform width along its longitudinal direction. However, as will be described in a later embodiment, it is not essential that the sheet-like member 40B has a uniform width along the longitudinal direction.

  The gas reservoir forming portion 46 is formed by folding both side portions of the sheet-like member 40B toward the center in the width direction of the sheet-like member 40B. Here, the outer two equal lines L1... Of the three equal lines dividing the sheet-like member 40B into four equal parts in the width direction. Both side portions of the sheet-like member 40B are folded along L2.

  Here, both side portions of the sheet-like member 40B are directed toward the center in the width direction at both end portions and intermediate portions thereof.

  The side edge portions on both sides of the sheet-like member 40B, that is, the side edge portions of the pair of gas reservoir forming portions 46 face each other without overlapping at the center portion in the width direction of the sheet-like member 40B. As a result, gas easily flows into the gas reservoir forming portion 46 through the gaps between the side edges of the pair of gas reservoir forming portions 46. The larger the gap between the side edges of the pair of gas reservoir forming portions 46, the easier the gas flows into the gas reservoir forming portion 46, while the gas reservoir portion 46A becomes smaller and the shape is difficult to maintain. The gap dimension between the side edges of the pair of gas reservoir forming portions 46 is appropriately set in consideration of gas flow, momentum, shape maintenance required in the diffuser 40, and the like.

  Of the portions where both side portions of the sheet-like member 40B are folded, both longitudinal end portions of the sheet-like member 40B are formed into a cylindrical shape or a semi-cylindrical shape by the gas supplied from the inflator 22. That is, when attention is paid to any one side portion of both end portions of the sheet-like member 40B, the one side portion is formed into a semi-cylindrical shape by the gas supplied from the inflator 22. When attention is paid to both side portions of both end portions of the sheet-like member 40B, the side portions on both sides are formed into a tubular shape by the gas supplied from the inflator 22 as a whole. In any case, at least one side portion of both end portions in the longitudinal direction of the sheet-like member 40B has a cylindrical or semi-cylindrical shape by the gas supplied from the inflator 22, and the cylindrical or semi-cylindrical shape is formed. By trying to maintain, the diffuser 40 tries to maintain a certain shape that is three-dimensionally spread from the inflator 22 into the airbag 30. For this reason, out of the portions where both side portions of the sheet-like member 40B are folded, the both ends in the longitudinal direction of the sheet-like member 40B are gas reservoir forming portions capable of forming the gas reservoir portion 46A with the gas supplied from the inflator 22 46.

  Of the portions where both side portions of the sheet-like member 40B are folded, the middle portion in the longitudinal direction of the sheet-like member 40B is greatly expanded by the gas supplied from the inflator 22, and the gas flowing into the middle portion in the longitudinal direction of the diffuser 40 It serves as an auxiliary rectifying part 48 for regulating the flow. Here, the auxiliary rectifying portion 48 regulates the gas flow so that the gas supplied from the inflator 22 is directed around the inflator 22.

  Further, at both end portions of the diffuser 40, recesses 44a and 44b corresponding to the outer shape of the inflator main body 23 and bolt insertion holes 45h through which the bolts 35 can be inserted are formed.

  More specifically, a semicircular recess 44a is formed at the center of the edge at both ends of the diffuser 40, and a 1/4 circular recess 44b is formed at both ends of the edge (FIG. 4). reference). Then, with both side portions of the diffuser 40 folded as described above, the concave portion 44b is disposed so as to overlap the concave portion 44a, and the semicircular concave portions 44 are formed at both end portions of the diffuser 40. (See FIGS. 5 to 7).

  Further, a bolt insertion hole 45h is formed around the recesses 44a and 44b in both end portions of the diffuser 40. The bolt insertion hole 45h is formed at a position corresponding to the bolt 35 of the cushion ring 34 in a state where both side portions of the diffuser 40 are folded as described above.

  Then, with the inflator main body 23 partially disposed in the recess 44 at each end of the diffuser 40, the bolt insertion hole 45 h is disposed at a position overlapping the bolt insertion hole 24 h of the collar portion 24.

  A procedure for attaching the diffuser 40 to the airbag 30 will be described.

  First, a long sheet-like member 40B shown in FIG. 4 is prepared, and both side portions of the sheet-like member 40B are folded toward the center in the width direction (see FIG. 5).

  Thereafter, a recess 44 at one end of the diffuser 40 is disposed along the opening edge of the cushion ring 34, and two adjacent bolts 35 among the four bolts 35 erected on the cushion ring 34 are replaced with the diffuser 40. Through one end of the bolt insertion hole 45h (see FIGS. 6 and 7).

  Then, the other end of the diffuser 40 is bent back so that the recess 44 at the other end of the diffuser 40 is disposed along the opening edge of the cushion ring 34, and the four bolts erected on the cushion ring 34. Two adjacent bolts 35 that are adjacent to the two adjacent bolts 35 are passed through the bolt insertion holes 45h at the other end of the diffuser 40 (see FIG. 8).

  As described above, in a state where the bolt 35 is passed through the bolt insertion hole 45h, the side of the diffuser 40 on which both sides are folded faces the cushion ring 34 side (that is, the inflator 22 side). Yes.

  7 and 8, the inflator 22 is drawn to facilitate understanding of the positional relationship between the diffuser 40 and the inflator 22, but in the actual assembling work, the inflator 22 is not assembled at this stage. Not attached.

  After the above operation, the diffuser 40 and the cushion ring 34 are disposed in the airbag 30, and the bolt 35 is passed through the bolt insertion hole 32 ha in the peripheral portion of the inflator mounting hole 32 h. Thereafter, the fixing panel 38 and the inflator 22 are disposed outside the peripheral portion of the inflator mounting hole 32h in the airbag 30 as described above, and the bolt 35 is connected to the bolt insertion hole 38h of the fixing panel 38, A nut 36 is fastened to the bolt 35 through the bolt insertion hole 24 h of the collar portion 24. As a result, both end portions of the diffuser 40 are sandwiched between the cushion ring 34 and the collar portion 24. That is, the both end portions of the diffuser 40 and the airbag 30 are fixed by the sandwiching structure and the structure in which the bolts 35 are inserted into the bolt insertion holes 45 h at both end portions of the diffuser 40.

  In the fixing structure of the both end portions of the diffuser 40, the both ends of the sheet-like member 40 </ b> B are folded, so that the end of the portion where the widthwise central portion and both sides overlap each other is the cushion ring 34. It is sandwiched between the flange portions 24 and fixed to the peripheral portion of the inflator mounting hole 32h. For this reason, the folding structure of the both sides of the sheet-like member 40B, that is, the gas reservoir forming part 46 is formed by the fixing structure.

  The operation of the diffuser 40 of the airbag apparatus 20 configured as described above will be described with reference to FIGS. 2, 3, and 9 to 11. 9 to 11 show the operation of the airbag device 20 in the section taken along line IX-IX in FIG.

  First, in the initial state, as shown in FIGS. 3 and 9, both side portions of the diffuser 40 are folded on the surface on the inflator 22 side of the center portion in the width direction of the diffuser 40. The diffuser 40 as a whole is also folded on the inflator 22.

  When gas is supplied from the inflator 22 in this state, the airbag 30 is inflated and deployed, and the gas is sprayed to the inner peripheral portion of the diffuser 40 as shown in FIG. Due to the force of the gas, the diffuser 40 tries to rise so as to rise in a C shape from the inflator 22 into the airbag 30. Further, the gas blown to the inner peripheral portion of the diffuser 40 flows into the gas reservoir forming portion 46 through the gap between the side edge portions on both sides of the diffuser 40 (see arrow F1 in FIG. 10). As a result, the gas reservoir forming portions 46 on both sides of the both end portions of the diffuser 40 try to swell so as to form a cylindrical shape or a semi-cylindrical shape. In addition, the auxiliary rectifying portions 48 on both sides of the intermediate portion in the longitudinal direction of the diffuser 40 also attempt to open widely.

  As shown in FIG. 11, the gas reservoir forming portions 46 on both sides of the both end portions of the diffuser 40 have a cylindrical shape or a semi-cylindrical shape that gradually widens from the end portion of the diffuser 40 toward the middle portion in the longitudinal direction. The formed gas reservoir 46A is formed. Due to the gas reservoir 46A, both side portions of the diffuser 40 are maintained in a constant shape, and the state of the diffuser 40 that regulates the flow of the gas supplied into the airbag 30 is stabilized.

  In the above state, the intermediate portion in the longitudinal direction of the diffuser 40 plays a role of restricting the gas from the inflator 22 from flowing into the airbag 30 in the direction of inflation. In particular, the auxiliary rectifying portions 48 on both sides of the intermediate portion in the longitudinal direction of the diffuser 40 are wide open to restrict the flow of the gas so that the gas supplied from the inflator 22 is returned to the periphery of the inflator 22 (arrows in FIG. 11). F2).

  Initially, even when the gas flows into only one gas reservoir forming portion 46 at both end portions of the diffuser 40 and the gas does not flow into the other gas reservoir forming portion 46, the one gas reservoir forming portion 46 is in the gas state. When it rises so as to rise due to the inflow, the other gas reservoir forming portion 46 is also deformed so as to be lifted, and this deformation makes it easier for the gas to flow into the other gas reservoir forming portion 46. For this reason, in the initial state, even when the gas flows into only one of the gas reservoir forming portions 46 at both end portions of the diffuser 40, the gas eventually flows into both the gas reservoir forming portions 46, and the diffuser 40 Rises to the desired shape and allows gas rectification.

  According to the airbag device 20 configured as described above, the gas reservoir forming portions 46 capable of forming the gas reservoir portions 46 </ b> A with the gas supplied from the inflator 22 are provided at both end portions of the diffuser 40. For this reason, in a state where gas flows into the airbag 30 and the gas flow is regulated by the diffuser 40, gas reservoirs 46A are formed at both end portions of the diffuser 40, and both end portions of the diffuser 40 are constant. It becomes easy to be maintained in the shape. For this reason, it becomes easy for the diffuser 40 to maintain a fixed shape, and the state of the diffuser 40 that regulates the flow of the gas supplied into the airbag 30 can be stabilized. Thereby, the inflation and deployment operation of the airbag 30 is stabilized.

  In order to achieve the above-described effects, the gas reservoir forming portion 46 (gas reservoir portion 46A) may be provided at both end portions of the diffuser 40. Therefore, in the present embodiment, both side portions are folded over the entire longitudinal direction of the sheet-like member 40B, but both side portions are folded only at both end portions excluding the central portion of the sheet-like member 40B. A gas reservoir forming part 46 (gas reservoir part 46A) may be provided (see the second embodiment).

  Further, in the above-described embodiment, the gas reservoir forming part 46 is formed by a structure that fixes both ends of the diffuser 40 to the airbag 30. Specifically, the gas reservoir forming portion 46 is formed by folding the side portions of both end portions of the diffuser 40 toward the center in the width direction of the diffuser 40, and the width direction center portion and the side portions of the both end side portions of the diffuser 40. The overlapping portion is fixed to the peripheral portion of the inflator mounting hole 32h of the airbag 30. With this fixing structure, the state where both end portions of the diffuser 40 are folded is maintained, and the gas reservoir forming portion 46 is formed.

  For this reason, the gas reservoir forming portion 46 can be provided by utilizing the fixing structure of the diffuser 40 without performing special processing for forming the gas reservoir forming portion on the diffuser itself, and the number of processing steps can be reduced. Can be reduced.

  The gas reservoir forming part may be formed by stitching a part of the diffuser to the other part of the diffuser.

  However, in this case, since the gas from the inflator 22 may hit the stitched portion, it is necessary to consider taking strength measures to withstand such gas.

  However, as described above, a screw fastening structure of the bolt 35 and the nut 36 is used as a fixing structure of the diffuser 40, and the peripheral portion of the inflator mounting hole 32 h and the diffuser 40 are interposed between the cushion ring 34 and the nut 36. Since the gas reservoir forming portion 46 is formed using the fixed structure after adopting the structure that sandwiches the gas, it is not necessary to consider the strength measures as described above.

  In addition, since the folded and overlapping portions of both end portions of the diffuser 40 are fixed to the peripheral portion of the inflator mounting hole 32h of the airbag 30, both end portions of the diffuser 40 are reinforced. However, it is difficult to break at the fixed part.

  More specifically, the airbag 30 and the diffuser 40 are configured such that the cushion ring 34 and the nut 36 (or the flange portion 24 supported by the nut 36) sandwich the bolt 35 into the bolt insertion hole 45h of the diffuser 40. It is fixed by the structure to be inserted. For this reason, when gas is sprayed on the diffuser 40, the tensile force tends to concentrate on the portion where the bolt 35 is penetrated through the bolt insertion hole 45h of the diffuser 40. Therefore, as described above, the bolt insertion hole 45h is formed in the folded and overlapped portion of both end portions of the diffuser 40, and the bolt 35 is passed through the bolt insertion hole 45, so that the fixed portions of the both end portions of the diffuser 40 are fixed. Is difficult to break.

  Further, in the present embodiment, cushion rings 34 as fixing members for fixing the inflator 22 to the airbag 30 are provided on the peripheral portion of the inflator mounting hole 32 h of the airbag 30, and both end portions of the diffuser 40 are provided. Is fixed to the peripheral portion of the inflator mounting hole 32 h by the cushion ring 34. For this reason, the structure for fixing the inflator 22 and the diffuser 40 to the airbag 30 can be made common, and the structure can be simplified.

  However, it is not indispensable that the configuration for the attachment is shared. For example, both end portions of the diffuser 40 may be separately fixed to the peripheral portion of the inflator mounting hole 32h in the airbag 30 by sewing or the like.

  Further, the gas reservoir forming portion 46 is configured to be able to form a cylindrical or semi-cylindrical gas reservoir portion extending along the extending direction of both end portions of the diffuser 40 by the gas supplied from the inflator 22. The both end portions of the diffuser 40 are maintained so as to form a cylindrical shape or a semi-cylindrical shape along the extending direction, whereby the state of the diffuser 40 can be stabilized.

  Further, since the gas reservoir forming portion 46 is formed by folding at least one side portion of both end portions of the diffuser 40 toward the center in the width direction of the diffuser 40, the gas reservoir forming portion 46 can be easily formed. .

  However, the gas reservoir forming portion 46 may be formed by stitching another sheet-like member to the sheet-like member constituting the main part of the diffuser.

  Further, in the present embodiment, a pair of gas reservoir forming portions are formed on both side portions of both end portions of the diffuser 40 by folding each side portion of the both end portions of the diffuser 40 toward the center portion in the width direction of the diffuser 40. 46 is formed.

  For this reason, the gas from the inflator 22 can form a pair of gas reservoirs 46 </ b> A so as to raise both side portions of both end portions of the diffuser 40. As a result, the gas flowing into the pair of gas reservoirs 46A is difficult to leak, and both side portions of both end portions of the diffuser 40 are maintained in an elongated shape. For this reason, the restricted state of the gas flow by the diffuser 40 is more reliably maintained in a constant state.

  In particular, by preventing the side edge portions of the pair of gas reservoir forming portions 46 from overlapping, it becomes easier for gas to flow in between the side edge portions of the pair of gas reservoir forming portions. Thus, the gas reservoir can be more reliably formed.

  In particular, the configuration facing each other with almost no gap makes it difficult for the gas flowing into the pair of gas reservoir forming portions 46 to leak.

  But in each of the both ends side part of the diffuser 40, the gas reservoir formation part may be formed only in one side part. In this case, in each of the both end portions of the diffuser 40, a gas reservoir forming portion may be formed on the same side portion, or a gas reservoir forming portion may be formed on a different side portion. .

  Further, auxiliary rectifying portions 48 that restrict gas flowing into the intermediate portion in the longitudinal direction of the diffuser 40 are provided on both sides of the intermediate portion in the longitudinal direction of the diffuser 40. For this reason, the flow of the gas flowing into the intermediate portion in the longitudinal direction of the diffuser 40 can be regulated in various ways. Here, the auxiliary rectifying portion 48 can regulate the gas flow such that the gas flows around the inflator 22.

  In particular, in the present embodiment, the auxiliary rectification portion is formed by folding both side portions of the intermediate portion in the longitudinal direction of the diffuser 40 together with portions that are both side portions of both ends in the longitudinal direction of the diffuser 40 and that form the gas reservoir forming portion 46. 48 is formed, the auxiliary rectifying portion 48 can be easily formed.

  In addition, the auxiliary | assistant rectification | straightening part may be provided only in one of the both sides of the longitudinal direction intermediate part of the diffuser 40. FIG. Further, it is not essential that the auxiliary rectifying portion 48 is provided (see the second embodiment).

{Second Embodiment}
An airbag device according to a second embodiment will be described. FIG. 12 is a cross-sectional view showing the overall configuration of the airbag apparatus 120 according to the present embodiment, and FIGS. 13 and 14 are perspective views showing the diffuser 140 of the airbag apparatus 120. 12 and 13 show a state in which the gas is supplied from the inflator, and FIG. 14 shows an initial state before the gas is supplied from the inflator 22. In the description of the present embodiment, the same components as those described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The airbag device 120 includes an inflator 22, an airbag 30, and a diffuser 140.

  The inflator 22 and the airbag 30 are the same as those described in the above embodiment. The inflator 22 and the diffuser 140 are fixed to the peripheral portion of the inflator mounting hole 32h of the airbag 30 by a fixing structure including the cushion ring 34 and the nut 36, as in the above embodiment.

  The diffuser 140 is the same as the diffuser 40 in that it restricts the flow of gas supplied from the inflator 22 in the airbag 30. The difference between the diffuser 140 and the diffuser 40 is as follows.

  That is, gas reservoir forming portions 146 are formed at both end portions of the diffuser 140 in place of the gas reservoir forming portions 46.

  Unlike the gas reservoir forming portion 46, the gas reservoir forming portion 146 opens toward the center in the longitudinal direction of the diffuser 140.

  Here, the opening of the gas reservoir forming portion 146 is opened so as to face the middle portion in the longitudinal direction of the diffuser 140 and the center in the width direction of the diffuser 140. More specifically, the opening of the gas reservoir forming portion 146 is inclined from the outer side in the width direction toward the center toward the end in the longitudinal direction of the diffuser 140 (here, an arc shape or other linearly inclined shape). (It may be a shape or the like) (see FIG. 16). For this reason, both the gas flowing from the center in the longitudinal direction of the diffuser 140 toward the both ends in the longitudinal direction inside the diffuser 140 and the gas flowing from the center in the width direction to the outer side in the width direction are both gasses through the openings. A gas reservoir 146A that flows into the reservoir forming portion 146 and opens toward the center in the longitudinal direction of the diffuser 140 can be formed.

  The opening of the gas reservoir forming portion may be configured to extend along the width direction of the diffuser 140 and open toward only the middle portion in the longitudinal direction of the diffuser 140.

  Moreover, in this diffuser 140, the auxiliary | assistant rectification | straightening part 48 in 1st Embodiment is abbreviate | omitted, and the longitudinal direction center part of the diffuser 140 is formed more narrowly than the other part. In this way, it is not essential that the center part in the longitudinal direction of the diffuser is formed narrow.

  An example of a procedure for forming the diffuser 140 will be described. 15-17 is explanatory drawing which shows the procedure which forms the diffuser 140. FIG.

  The diffuser 140 is formed by an elongated belt-like sheet-like member 140B (see FIG. 15). Here, the sheet-like member 140B is formed in a shape in which a concave portion 140Ba is formed in the center portion in the longitudinal direction of both side portions of the elongated strip-like member. Here, the concave portion 140Ba is formed in a concave shape that draws a semicircular shape, but may be a shape that is recessed in a square shape or a shape that is recessed in a trapezoidal shape.

  The most concave portion of the recess 140Ba is a central portion in the longitudinal direction of the diffuser 140, and the outer two equal lines L3... Of the three equal lines dividing the sheet-like member 140B into four equal parts in the width direction. It has reached the inner side than L4.

  Both side portions of the sheet-like member 140B are folded toward the center portion in the width direction along the equal lines L3 and L4, whereby gas reservoir portions 146A are formed at both end portions of the sheet-like member 140B. It is formed (see FIG. 16).

  In the present embodiment, the side edges of both side portions of the both end portions of the sheet-like member 140B, that is, the side edges of the pair of gas reservoir forming portions 146 are the central portions in the width direction of the sheet-like member 140B. They are facing each other without overlapping. But these side edge parts may overlap.

  Then, both end portions of the sheet-like member 140B are fixed to the peripheral portion of the inflator mounting hole 32h of the airbag 30 using the cushion ring 34 in the same manner as in the first embodiment (see FIG. 17).

  The part by which the side part was folded among the both end side parts of the said sheet-like member 140B makes | forms a cylinder shape or a semi-cylinder shape with the gas supplied from the inflator 22 like the said 1st Embodiment. For this reason, as in the first embodiment, the gas reservoir forming portions 146 capable of forming the gas reservoir portions 146A are formed on both side portions of the both end portions of the diffuser 140, respectively.

  Further, the central portion in the longitudinal direction of the diffuser 140 is formed with a narrow width. The narrow portion restricts the flow of the gas so that the gas does not flow vigorously from the inflator 22 toward the inflation direction of the airbag 30.

  The operation of the diffuser 140 of the airbag device 120 will be described with reference to FIGS. 13, 14, and 18 to 20. 18 to 20 show the operation of the airbag device 120 taken along the line XVIII-XVIII in FIG.

  First, in the initial state, as shown in FIGS. 14 and 18, both side portions of both end portions of the diffuser 140 are folded on the surface on the inflator 22 side in the central portion in the width direction of the diffuser 140. Yes. The diffuser 140 as a whole is also folded on the inflator 22.

  When gas is supplied from the inflator 22 in this state, the airbag 30 is inflated and deployed, and the gas is sprayed to the inner peripheral portion of the diffuser 140 as shown in FIG. Among the gases blown to the inner peripheral part of the diffuser 140, the gas (refer to the arrow F <b> 3 in FIG. 19) from the longitudinal center of the diffuser 140 toward both ends in the longitudinal direction of the diffuser 140, and the width direction of the diffuser 140 A gas (refer to an arrow F4 in FIG. 19) from the central portion toward the outer side in the width direction flows into the gas reservoir forming portion 146 through the opening of the gas reservoir forming portion 146.

  As shown in FIG. 20, the gas reservoir forming portions 146 on both sides of the both end portions of the diffuser 140 are inflated by the gas and gradually expand from the end of the diffuser 40 toward the middle in the longitudinal direction. A gas reservoir 146A having a semi-cylindrical shape is formed. By this gas reservoir 146A, both side portions of the diffuser 140 are maintained in a fixed shape, and the state of the diffuser 140 that regulates the flow of the gas supplied into the airbag 30 is stabilized.

  Further, the central portion in the longitudinal direction of the diffuser 40 is in a state of being developed so as to draw a gentle curved surface, so that the gas supplied from the inflator 22 does not flow vigorously toward the inflation direction of the airbag 30. The flow of gas is regulated (see arrow F5 in FIG. 20).

  According to the airbag apparatus 120 configured as described above, the same operational effects as those of the first embodiment can be obtained except for the operational effects of the auxiliary rectifying portion 48.

  In addition, since the gas reservoir forming part 146 opens toward the longitudinal center part of the diffuser, when the gas supplied toward the longitudinal center part of the diffuser flows into both ends of the diffuser in the longitudinal direction, The gas reservoir 146A can be more reliably formed by flowing into the gas reservoir forming portion 146 through the opening. Thereby, the diffuser 140 can be more reliably maintained in the expanded state.

  In addition, since the gas reservoir forming part 146 opens toward the longitudinal center part of the diffuser and the width direction center part of the diffuser 140, the gas flowing from the width direction center part of the diffuser toward the outside in the width direction, The gas flows into the gas reservoir forming part 146 through the opening. For this reason, the gas reservoir 146A can be more reliably formed, and the diffuser 140 can be more reliably maintained in the expanded state.

  Further, since the central portion in the width direction of the diffuser 140 is formed with a narrow width, the material for forming the diffuser 140 can be reduced.

{Third embodiment}
An airbag device according to a third embodiment will be described. FIG. 21 is a diagram showing a state before the diffuser 240 is assembled into the airbag device, and FIG. 22 is a diagram showing a state where the diffuser 240 is attached to the cushion ring 34. In the description of the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The diffuser 240 is the same as the diffuser 40 in that it restricts the flow of gas supplied from the inflator 22 in the airbag. The difference between the diffuser 240 and the diffuser 40 is as follows.

  That is, the side portions of the diffuser 240 are folded so that the side edges overlap each other, so that a pair of gas reservoir forming portions 246 are formed on both side portions of both end portions in the longitudinal direction of the diffuser 240. Yes.

  An inflow hole 246h is formed in the overlapped portion of the side edges of the pair of gas reservoir forming portions 246 so as to penetrate the overlapped portion inward and outward. Here, inflow holes 246h are formed at positions inside (slightly inside) both end portions of the diffuser 240 that are fixed to the airbag.

  According to the present embodiment, the same operational effects as those of the first embodiment can be obtained except for the operational effects based on the configuration in which the side edges of the pair of gas reservoir forming portions do not overlap each other.

  In addition, according to the present embodiment, since the side edges of the pair of gas reservoir forming portions overlap each other, the gas flowing into the pair of gas reservoir forming portions 246 is difficult to escape, and both end portions of the diffuser 240 are It becomes easier to maintain the expanded state.

  Moreover, since the inflow hole 246h which penetrates the overlap part is formed in the overlapped part among the side edges of the pair of gas reservoir forming parts 246, as shown in FIG. The gas easily flows into the pair of gas reservoirs 246 through the inflow holes 246h. For this reason, a gas reservoir part can be formed more reliably.

  But in this embodiment, it is not essential that the inflow hole 246h is formed. For example, the gas flowing into the inside of the diffuser 240 may flow up into the pair of gas reservoir forming portions 246 by sequentially rolling up the side edges of the pair of gas reservoir forming portions 246.

{Fourth embodiment}
An airbag device according to a fourth embodiment will be described. FIG. 24 is a development view showing a sheet-like member 340B for forming a diffuser 340 incorporated in the airbag device 320, FIG. 25 is a view showing a state where the diffuser 340 is attached to the cushion ring 34, and FIG. 26 is an inflator. 22 is a diagram illustrating a state of the diffuser 340 in a state in which gas is supplied from 22. FIG. In the description of the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The diffuser 340 is the same as the diffuser 40 in that it restricts the flow of gas supplied from the inflator 22 in the airbag. The difference between the diffuser 340 and the diffuser 40 is as follows.

  In other words, among the both ends of the widthwise central portion of the both end portions of the long sheet-like member 340B for forming the diffuser 340, fixing points to the peripheral portion of the inflator mounting hole 32h of the airbag 30, that is, the sheet The distance connecting the bolt insertion holes 345ha located at the positions from the center in the width direction at both ends of the shaped member 340B is defined as Lb.

  Further, both side portions of both end portions of the sheet-like member 340B are folded so as to overlap with the center portion in the width direction of the sheet-like member. More specifically, the width of the sheet-like member 340B is such that both side portions at both end portions of the diffuser 340 are directed from the longitudinal end side of the sheet-like member 340B for forming the diffuser 340 toward the longitudinal center portion. It is folded along inclined lines L5 and L6 that are inclined toward the center in the direction. Note that both side portions of the intermediate portion in the longitudinal direction of the sheet-like member 340B are also folded toward the center in the width direction of the sheet-like member 340B, and the fold of this portion is straight along the longitudinal direction of the sheet-like member 340B. It may be.

  And the distance which connects the bolt insertion hole 345hb in the position from the width direction outer side in the both ends of the inflator attachment hole 32h among these both sides, ie, the both ends of the sheet-like member 340B, is set to La. .

  In the present embodiment, the distance Lb is set larger than the distance La.

  In other words, the attachment location at the position from the outside in the width direction of the both end portions of the sheet-like member 340B is larger than the attachment location at the center portion in the width direction of both end portions of the sheet-like member 340B. It is set at a position from the center in the longitudinal direction.

  In addition, concave portions 344a and 344b corresponding to the outer shape of the inflator main body portion 23 are formed at both ends of the sheet-like member 340B. These concave portions 344a and 344b are formed in positions and shapes that overlap each other so as to form arc-shaped concave portions in a state where both side portions of the intermediate portion in the longitudinal direction of the sheet-like member 340B are folded along the inclined lines L5 and L6. Has been.

  Also according to this embodiment, the same effect as the first embodiment can be obtained.

  In addition, when the gas from the inflator 22 is blown to the inside of the diffuser 340 and the diffuser 340 swells to form a C shape as a whole, the difference between the distances La and Lb as shown in FIGS. Accordingly, both side portions of the sheet-like member 340B are located on the inner peripheral side of the diffuser 340 and swell in a relatively small C shape, and the central portion in the width direction of the sheet-like member 340B is the outer peripheral side of the diffuser 340. It swells in a relatively large C shape. That is, the both side portions of the sheet-like member 340B are drawn inward from the center in the width direction. For this reason, a gap is formed between the widthwise central portion and both side portions of the sheet-like member 340B, and the gas can easily flow into the gas reservoir forming portions 346 formed at both end portions of the diffuser 340, and more reliably. A gas reservoir 346A can be formed.

  Also in this embodiment, it is not essential that both sides of the long sheet-like member 340B are folded, and only one of them may be folded.

{Fifth embodiment}
An airbag device according to a fifth embodiment will be described. FIG. 27 is a perspective view showing a diffuser 440 incorporated in the airbag apparatus according to the fifth embodiment, and FIG. 28 is a development view showing a sheet-like member 440B for forming the diffuser 440. In the description of the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The diffuser 440 is the same as the diffuser 40 in that it restricts the flow of gas supplied from the inflator 22 in the airbag. The difference between the diffuser 440 and the diffuser 40 is as follows.

  That is, both end portions of the long sheet-like member 440B for forming the diffuser 440 are formed in a shape that gradually becomes wider toward the outside of the end.

  Further, both side portions of both end portions of the sheet-like member 440B are folded so as to overlap with the center portion in the width direction of the sheet-like member. At this time, both side portions of both end portions of the sheet-like member 440B are folded along inclined lines L7 and L8 that gradually go outward toward the outer side of the end portions.

  In addition, concave portions 444a and 444b corresponding to the outer shape of the inflator main body portion 23 are formed at both ends of the sheet-like member 440B. These concave portions 444a and 444b are formed in positions and shapes that overlap each other so as to form arc-shaped concave portions in a state in which both side portions of the intermediate portion in the longitudinal direction of the sheet-like member 440B are folded along the inclined lines L7 and L8. Has been.

  In addition, a recess 440Ba is formed in the longitudinal center of both sides of the sheet-like member 440B. Here, the concave portion 440Ba is formed in a concave shape that draws a semicircular shape. The portion where the recess 440Ba is most recessed is the central portion in the longitudinal direction of the diffuser 440. The recess 440Ba plays the same role as the recess 140Ba in the second embodiment.

  In addition, holes 446h that open at positions inside the inclined lines L7 and L8 that are folds of at least one side portion (here, both side portions) are formed in both end portions of the long sheet-like member 440B. ing. Then, the gas flowing into the diffuser 440 flows out of the diffuser 440 through the hole 446h. Thereby, the airbag 30 can be effectively inflated at a position facing the hole 44h, and the airbag 30 can be inflated in various modes.

  The hole 446h has a circular shape, but may have an elliptical shape, a polygonal shape, or the like.

  In addition, here, the hole 446h is formed in the center portion in the width direction of both end portions of the sheet-like member 440B. Accordingly, gas reservoirs 446A are formed on both sides of the hole 446h. However, the hole 446h may be formed at a position biased to the gas reservoir 446A on one side.

  In the present embodiment, the concave portion 446ha is formed in a portion that overlaps the hole 446h in both side portions of both end portions of the sheet-like member 440B. That is, both side portions of both end portions of the sheet-like member 440B for forming the gas reservoir portion 446A do not overlap with the hole 446h. Thereby, the gas that has flowed into the diffuser 440 can thereby flow more reliably out of the diffuser 440 through the concave portion 446ha and the hole 446h.

{Modifications}
In addition, each structure demonstrated by each said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

20, 120, 320 Airbag device 22 Inflator 24 Collar 24h Bolt insertion hole 30 Airbag 32h Inflator mounting hole 32ha Bolt insertion hole 34 Cushion ring 35 Bolt 36 Nut 40, 140, 240, 340 Diffuser 40B, 140B, 340B Sheet shape Member 45h Bolt insertion hole 46, 146, 246, 346 Gas reservoir forming portion 46A, 146A, 346A Gas reservoir 48 Auxiliary rectifying portion 246h Inflow hole 345ha Bolt insertion hole 345hb Bolt insertion hole

Claims (2)

An inflator capable of generating gas,
An inflator mounting hole to which the inflator is mounted in a state in which gas can be supplied therein, and an airbag that can be inflated and deployed by the gas supplied from the inflator;
A fixing member that is provided in a peripheral portion of the inflator mounting hole in the airbag and fixes the inflator;
Both ends are fixed to the peripheral portion of the inflator mounting hole by the fixing member, and a diffuser that regulates the flow of gas supplied from the inflator in the airbag,
With
The diffuser is formed by a long sheet-like member, and at both ends in the longitudinal direction, both sides in the short direction are folded back toward the center in the short direction, and each side is The side edges are arranged so that they do not overlap with each other along the center line in the lateral direction, and both ends in the longitudinal direction are fixed to the inflator by the fixing members, and the inflator mounting hole as a whole And in the state where each folded back side faces the inflator mounting hole side, it is arranged in the airbag,
When gas is ejected from a gas ejection hole of the inflator that is attached to the inflator mounting hole and disposed in the airbag, each side portion is opened at a portion from both longitudinal ends of the diffuser toward the longitudinal central portion. An airbag device in which a tubular shape or one side portion is opened to form a semi-cylindrical shape to form a gas reservoir . The airbag device according to claim 1,
The airbag apparatus in which the longitudinal direction intermediate part of the said diffuser is formed in the narrow width.

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