JP6966909B2 - Airbag device - Google Patents

Description

The present invention relates to an airbag device. More specifically, the present invention relates to an airbag device that expands and expands in an emergency of a vehicle such as an automobile to protect an occupant.

The airbag device is a device that deploys an airbag inflated by introducing gas into the vehicle interior (hereinafter, also simply referred to as "inside the vehicle") in order to protect the occupants in an emergency such as a vehicle collision. For example, an inflator is used as a means for introducing gas into the airbag. Since the gas generated from the inflator is ejected from the gas ejection hole of the inflator, the vicinity of the gas ejection hole becomes a high temperature state.

For example, Patent Document 1 discloses an airbag device for protecting an airbag from the gas while guiding the gas ejected from the gas ejection hole of the inflator. In this airbag device, a cloth-like member (flexible sheet) is wound around a gas ejection hole to form a gas rectifying member, and the gas rectifying member is inserted into a gas introduction portion of the airbag. In this state, it is fastened with an annular fastening band from the outside of the gas introduction portion. The gas rectifying member (cloth-like member) plays a role of protecting the airbag from the gas ejected from the gas ejection hole. Further, the fastening band plays a role of sealing the gas ejected from the gas ejection hole so as not to leak to the outside of the airbag.

Japanese Unexamined Patent Publication No. 2009-21416

In recent years, there has been a strong demand for airbag devices to have larger airbags and smaller inflators, and along with these demands, the temperature of the gas ejected from the gas ejection holes of the inflator has increased. , The momentum of the eruption sometimes became stronger. On the other hand, in the airbag device described in Patent Document 1, it is considered to increase the number of times the cloth-like member is wound (the number of times the cloth-like member is overlapped) in order to reduce the damage to the airbag due to the gas. Was done. However, as the number of windings of the cloth-like member is increased, it is necessary to increase the diameter of the fastening band accordingly. In particular, since the diameter of the inflator is often constant, it is necessary to adjust the diameter of the fastening band each time the number of windings of the cloth-like member is increased.

The present invention has been made in view of the above situation, and provides an airbag device that does not require adjustment of the diameter of the fastening band even if the number of times the flexible sheets constituting the gas rectifying member are stacked increases. Is the purpose.

One aspect of the present invention is from an inflator having a tubular main body portion, a gas ejection hole provided at an end portion of the main body portion, and a bag-shaped main bag portion, and the main bag portion. An airbag having a gas introduction portion into which the main body portion of the inflator is inserted, and the main body portion and the gas introduction portion of the airbag so as to surround the outer periphery of the main body portion of the inflator. The region where the gas rectifying member made of a flexible sheet in a multi-layered state, the main body portion of the inflator, the gas rectifying member, and the gas introducing portion of the airbag overlap each other is described. A fastening band to be fastened from the outside of the gas introduction portion of the airbag is provided, and the gas rectifying member in the multilayer state has at least one having the same width or wider than the fastening band in a corresponding portion overlapping with the fastening band. The airbag device is provided with one slit along the circumferential direction of the main body of the inflator and having a length equal to or longer than the circumferential length of the main body of the inflator.

According to the present invention, it is possible to provide an airbag device that does not require adjustment of the diameter of the fastening band even if the number of times the flexible sheets constituting the gas rectifying member are stacked increases.

It is a top view which shows the initial state of the airbag device of an embodiment attached to a vehicle. FIG. 3 is a schematic plan view showing a deployed state of the airbag device in FIG. 1. It is a perspective schematic diagram which shows the specific example of a fastening band. It is a plan view which shows the structural example 1 of the gas rectifying member, (a) shows the state before the gas rectifying member is arranged around the inflator, (b) is the state before the gas rectifying member is arranged around an inflator. Shows the state after being placed. It is sectional drawing which shows the part corresponding to the line segment A1-A2 in FIG. 4 (b). It is sectional drawing which shows the part corresponding to the line segment B1-B2 in FIG. 4 (b). FIG. 6B is a schematic cross-sectional view showing a state in which the inflator and the gas rectifying member in FIG. 4B are inserted into the gas introduction portion of the airbag and fastened with a fastening band. It is a plan view which shows the structural example 2 of the gas rectifying member, (a) shows the state before the gas rectifying member is arranged around an inflator, (b) is the state before the gas rectifying member is arranged around an inflator. Shows the state after being placed. It is sectional drawing which shows the part corresponding to the line segment A3-A4 in FIG. 8 (b). It is sectional drawing which shows the part corresponding to the line segment B3-B4 in FIG. 8 (b). FIG. 8B is a schematic cross-sectional view showing a state in which the inflator and the gas rectifying member in FIG. 8B are inserted into the gas introduction portion of the airbag and fastened with a fastening band.

The airbag device of the embodiment will be described below with reference to the drawings. In this embodiment, a curtain airbag device will be described as an example of the airbag device.

First, the initial state of the airbag device will be described below with reference to FIG. FIG. 1 is a schematic plan view showing an initial state of an airbag device of an embodiment attached to a vehicle. FIG. 1 illustrates a state in which a side wall inside the vehicle (hereinafter, also simply referred to as “vehicle side wall”) of the vehicle is viewed from the inside of the vehicle. Here, the initial state of the airbag device means a state before the airbag starts expansion and deployment.

The airbag device 1 includes an inflator 10, an airbag 20, a gas rectifying member 30, and a fastening band 40.

The airbag device 1 is covered with an interior material and stored above the side wall (vehicle side wall) inside the vehicle 50. The airbag device 1 is housed in a space (storage portion of the vehicle side wall) formed between the vehicle side wall and the interior material so as not to be visually recognized by the occupants in the vehicle. The airbag device 1 is specifically illustrated.

The side wall of the vehicle is not particularly limited as long as it is a vehicle body portion located on the side of the occupant seated in the seat, and is a general term for side doors, pillars, side windows and the like. Vehicle side walls include a roof side rail 51 above the vehicle, a front pillar (A pillar) 52 in front of the vehicle, a center pillar (B pillar) 53 in the center of the vehicle, and a rear pillar (C pillar) (not shown) behind the vehicle. Can be mentioned. In FIG. 1, the rear portion of the vehicle and the lower portion of the vehicle are omitted from the side wall of the vehicle. In the present specification, the upper side of the front pillar 52 above the center is above the vehicle side wall, and the lower side of the front pillar 52 below the center is below the vehicle side wall.

The interior material is not particularly limited as long as it is a member that covers the side wall of the vehicle, and examples thereof include a ceiling material 51A that covers the roof side rail 51, a front pillar trim 52A that covers the front pillar 52, a center pillar trim 53A that covers the center pillar 53, and a rear pillar. Examples include a rear pillar trim (not shown) that covers it.

The airbag 20 is arranged on the roof side rail 51, the front pillar 52, and the rear pillar along the longitudinal direction of the vehicle. The airbag 20 is folded into a rod shape and stored in a state of being wrapped with a wrapping material (not shown) that can be broken when expanded. In an emergency of the vehicle 50 (for example, in the case of a side collision of the vehicle 50), the gas generated from the inflator 10 is introduced into the airbag 20 to expand the airbag 20 and unfold it. Then, when the interior material is pushed open by the force applied from the inflated airbag 20, the airbag 20 descends into the vehicle and further expands, and expands and expands like a curtain from the upper side to the lower side of the vehicle side wall. As a result, the expanded and expanded airbag 20 covers the side wall of the vehicle from the inside of the vehicle along the front-rear direction of the vehicle 50, so that the occupant in the vehicle is protected around the head.

Next, the details of the constituent members of the airbag device 1 will be described below with reference to FIG. FIG. 2 is a schematic plan view showing a deployed state of the airbag device in FIG. 1.

The inflator 10 is a cylindrical (cylindrical) gas generator, and has a cylindrical main body portion 11 and a gas ejection hole 12 provided at an end portion of the main body portion 11 to eject gas. The inflator 10 is attached to the roof side rail 51 above the center pillar 53.

The inflator 10 operates in an emergency of the vehicle 50. For example, when the collision detection sensor mounted on the vehicle 50 detects a side collision of the vehicle 50, the ECU (Engine Control Unit) calculates a signal sent from the collision detection sensor to determine the level of the collision. When the determined collision level corresponds to the case where the airbag 20 is inflated, the inflator 10 is ignited and gas is generated by a chemical reaction due to combustion. The gas generated from the inflator 10 is introduced into the airbag 20 through the gas ejection hole 12.

The type of the inflator 10 is not particularly limited, and for example, a pyrotechnician inflator that uses gas generated by burning a gas generator, a stored inflator that uses compressed gas, and a gas and compression generated by burning a gas generator. Examples thereof include a hybrid inflator that uses a mixed gas with a gas.

The airbag 20 has a bag-shaped main bag portion 21 and a gas introduction portion 22 into which the main body portion 11 of the inflator 10 is inserted from the main bag portion 21. Since the gas ejection hole 12 of the inflator 10 is inserted into the gas introduction portion 22 of the airbag 20, the gas ejected from the gas ejection hole 12 of the inflator 10 passes through the gas introduction portion 22 to the inside of the main bag portion 21. Will be introduced to. The gas introduction portion 22 of the airbag 20 is arranged at the upper edge (upper end in the vehicle height direction) of the airbag 20. In the airbag 20, since the gas introduction portion 22 is arranged near the center of the vehicle 50 in the front-rear direction, the gas flow inside the main bag portion 21 from the vicinity of the center of the vehicle 50 in the front-rear direction toward the front end. , A gas flow from the vicinity of the center in the front-rear direction of the vehicle 50 toward the rear end will occur.

The airbag 20 is formed in a bag shape in the main bag portion 21 and in a tubular shape in the gas introduction portion 22 by superimposing the first base cloth 26 and the second base cloth 27 and joining them along the outer peripheral joining portion 24. Will be done. The first base cloth 26 and the second base cloth 27 may be two independent base cloths, or the same base cloth which is formed by folding one base cloth in half and facing each other. It may be a part.

As the first base cloth 26 and the second base cloth 27, for example, a cloth woven with a thread such as nylon 66 or polyethylene terephthalate (PET) is used. The surfaces of the first base cloth 26 and the second base cloth 27 may be coated with an inorganic substance such as silicon in order to improve heat resistance, airtightness, and the like.

The outer peripheral joint portion 24 is a portion in which the first base cloth 26 and the second base cloth 27 are joined in an annular shape so that the airbag 20 has airtightness, and is an expanded portion (main bag portion 21) of the airbag 20. ) Specifies the outer edge shape. The method of joining the first base cloth 26 and the second base cloth 27 is not particularly limited, and examples thereof include stitching, adhesion, welding, and a combination thereof.

In the airbag 20, the first base cloth 26 and the second base cloth 27 are joined in a region surrounded by the outer peripheral joint portion 24 between the vehicle longitudinal end portion of the main bag portion 21 and the gas introduction portion 22. It has a plurality of joints 25 made. According to the joint portion 25, the thickness of the main bag portion 21 at the time of expansion in the vehicle width direction can be partially regulated, and the expansion shape of the main bag portion 21 can be controlled.

A plurality of fixing cloths (tabs) 23 are joined to the airbag 20 so as to project from the upper edge of the main bag portion 21. The fixing cloth 23 is fixed to the roof side rail 51 and the front pillar 52 by using, for example, bolts, clips and the like.

The fastening band 40 fastens a region where the main body portion 11 of the inflator 10, the gas rectifying member 30, and the gas introduction portion 22 of the airbag 20 overlap from the outside of the gas introduction portion 22 of the airbag 20. .. By providing the fastening band 40, a gap is eliminated to improve airtightness, and the pressure of the gas ejected from the gas ejection hole 12 of the inflator 10 causes the main body 11 of the inflator 10 to move from the gas introduction portion 22 of the airbag 20. It can be prevented from coming off. As a result, according to the fastening band 40, the gas ejected from the gas ejection hole 12 of the inflator 10 can be prevented from leaking to the outside of the airbag 20.

As the fastening band 40, for example, an annular band as shown in FIG. 3 is used. FIG. 3 is a schematic perspective view showing a specific example of the fastening band. Examples of the fastening method of the fastening band 40 include a method of hooking and fastening a pair of claws 41 to each other, a clamp method, and the like, as shown in FIG. The fastening band 40 is preferably made of metal from the viewpoint of maintaining a high fastening force even at high temperatures.

The gas rectifying member 30 is arranged between the main body 11 of the inflator 10 and the gas introduction portion 22 of the airbag 20 so as to surround the outer periphery of the main body 11 of the inflator 10. That is, the gas ejection hole 12 of the inflator 10 is inserted into the gas introduction portion 22 of the airbag 20 together with the gas rectifying member 30. According to the gas rectifying member 30, the airbag 20 can be protected from the gas in a high temperature state immediately after being ejected from the gas ejection hole 12 of the inflator 10.

The gas rectifying member 30 is made of a flexible sheet in a multi-layered state. In the present specification, the "multilayered flexible sheet" is a form in which one long flexible sheet is wound a plurality of times on the outer periphery of the main body 11 of the inflator 10 (described later). (See FIG. 4) and a plurality of short flexible sheets are overlapped with each other, and the ends are joined to each other in a state of surrounding the outer periphery of the main body 11 of the inflator 10 (see FIG. 8 to be described later). Represents.

A configuration example of the gas rectifying member 30 will be described below.

(Configuration Example 1)
The first configuration example is a case where one long flexible sheet is wound around the main body 11 of the inflator 10 a plurality of times to form the gas rectifying member 30. FIG. 4 is a schematic plan view showing a configuration example 1 of the gas rectifying member, FIG. 4A shows a state before the gas rectifying member is arranged around the inflator, and FIG. 4B shows a state before the gas rectifying member is arranged around the inflator. Shows the state after being placed around the inflator. FIG. 5 is a schematic cross-sectional view showing a portion corresponding to the line segments A1-A2 in FIG. 4 (b). FIG. 6 is a schematic cross-sectional view showing a portion corresponding to the line segments B1-B2 in FIG. 4 (b). FIG. 7 is a schematic cross-sectional view showing a state in which the inflator and the gas rectifying member in FIG. 4B are inserted into the gas introduction portion of the airbag and fastened by the fastening band.

As shown in FIG. 4A, the long flexible sheet 31 constituting the gas rectifying member 30 is provided with at least one slit 32 (three in FIG. 4A). There is. Then, when the flexible sheet 31 is wound a plurality of times along the circumferential direction of the main body portion 11 of the inflator 10 to form the gas rectifying member 30 in a multilayer state, the slit 32 forms the circumferential direction of the main body portion 11 of the inflator 10. A configuration is obtained in which the gas rectifying member 30 is arranged around the inflator 10 as shown in FIG. 4 (b). After that, a configuration as shown in FIG. 4B is inserted into the gas introduction portion 22 of the airbag 20 from the gas ejection hole 12 side of the inflator 10, and the region overlapping the slit 32 of the gas rectifying member 30 is inserted into the airbag 20. When the fastening band 40 is fastened from the outside of the gas introducing portion 22 of the above, the state as shown in FIG. 7 is obtained. That is, the gas rectifying member 30 in the multilayer state is provided with a slit 32 at a corresponding portion overlapping with the fastening band 40.

As shown in FIG. 4A, the flexible sheet 31 constituting the gas rectifying member 30 is provided with a plurality of bolt holes 33 in addition to the slit 32. The bolt hole 33 protrudes from the main body 11 of the inflator 10 as shown in FIG. 6 when the flexible sheet 31 constituting the gas rectifying member 30 is wound around the main body 11 of the inflator 10 a plurality of times. It is a hole through which the bolt 13 passes and is distinguished from the slit 32. The main body 11 of the inflator 10 is attached to the roof side rail 51 by a bolt 13 that has passed through the bolt hole 33. When the bolt 13 is not provided in the main body 11 of the inflator 10, the flexible sheet 31 constituting the gas rectifying member 30 may not be provided with the bolt hole 33.

As shown in FIG. 5, the slit 32 of the gas rectifying member 30 has the main body of the inflator 10 in a state where the flexible sheet 31 is wound around the main body 11 of the inflator 10 a plurality of times (four times in FIG. 5). It is provided along the circumferential direction of the portion 11 and having a length equal to or longer than the circumferential length of the main body portion 11 of the inflator 10. Here, the length of the slit 32 of the gas rectifying member 30 means the total length (total length) of each slit 32 in the circumferential direction of the main body portion 11 of the inflator 10, and is shown in FIG. 5 (FIG. 4 (a)). Then, it corresponds to L1 + L2 + L3. As described above, the cross-sectional size of the gas rectifying member 30 is reduced by the amount of the slit 32 (the portion where the flexible sheet 31 does not intervene) in the region where the slit 32 is provided. Therefore, as shown in FIG. 7, the region where the main body portion 11 of the inflator 10, the slit 32 of the gas rectifying member 30, and the gas introduction portion 22 of the airbag 20 overlap is the region where the gas introduction portion 22 of the airbag 20 overlaps. When fastening with the fastening band 40 from the outside, even if the number of windings of the flexible sheet 31 constituting the gas rectifying member 30 is increased in order to reduce damage to the airbag 20 due to gas, the diameter of the fastening band 40 is large. No adjustment is required. As a specific example, when it is desired to increase the number of turns of the flexible sheet 31 constituting the gas rectifying member 30 by one, the peripheral length of the main body 11 of the inflator 10 is overlapped with the fastening band 40 of the gas rectifying member 30. The slit 32 may be provided with the same length (total length) as above. As a result, the cross-sectional size of the gas rectifying member 30 is reduced by the thickness of the flexible sheet 31 in the region where the slit 32 is provided, so that the fastening has the same diameter as before increasing the number of windings of the flexible sheet 31. The band 40 can be used, and as a result, the diameter of the fastening band 40 does not need to be adjusted. Further, when it is desired to increase the number of windings of the flexible sheet 31 constituting the gas rectifying member 30 twice, the peripheral length of the main body 11 of the inflator 10 is 2 in the corresponding portion overlapping with the fastening band 40 of the gas rectifying member 30. The slit 32 may be provided with a double length (total length).

According to the gas rectifying member 30, even if the number of windings of the flexible sheet 31 is increased, it is not necessary to increase the diameter of the fastening band 40, so that the fastening band 40 and the roof side rail 51 (vehicle body portion) interfere with each other. It becomes difficult.

As shown in FIG. 4A, it is preferable that a plurality of slits 32 of the gas rectifying member 30 are provided at intervals along the circumferential direction of the main body portion 11 of the inflator 10. When gas is ejected from the gas ejection hole 12 of the inflator 10, the airbag 20 (gas introduction portion 22) and the gas rectifying member 30 are pulled in the length direction of the main body portion 11 of the inflator 10 by the force of the gas. At this time, when a plurality of slits 32 of the gas rectifying member 30 are provided as shown in FIG. 4A, only one is provided (for example, the plurality of slits 32 are connected to one. As compared with the case of), the inflator 10 is less likely to be pulled in the length direction of the main body 11, and as a result, the gas rectifying member 30 is less likely to be damaged.

When the gas rectifying member 30 has a plurality of slits 32, the sizes of the slits 32 may be the same as each other or may be different from each other. For example, FIGS. 4 (a) and 4 (5) illustrate a state in which the lengths L1, L2, and L3 of the respective slits 32 in the circumferential direction of the main body 11 of the inflator 10 are the same as each other. The lengths L1, L2, and L3 may be different from each other. Further, in FIGS. 4A and 6A, a state in which the widths W1, W2, and W3 of the respective slits 32 in the length direction of the main body 11 of the inflator 10 are the same as each other is exemplified. The widths W1, W2, and W3 may be different from each other.

The slit 32 of the gas rectifying member 30 may be provided along the circumferential direction of the main body portion 11 of the inflator 10, but as shown in FIG. 5, the innermost peripheral surface of the gas rectifying member 30 (main body of the inflator 10). It is preferable that it is provided between the inner peripheral surface on the portion 11 side and the outermost outer peripheral surface (the side opposite to the main body portion 11 of the inflator 10, that is, the outer peripheral surface on the gas introduction portion 22 side of the airbag 20). .. When the slit 32 of the gas rectifying member 30 is provided on the innermost peripheral surface, when gas is ejected from the gas ejection hole 12 of the inflator 10, the gas rectifying member 30 causes the main body 11 of the inflator 10 by the force of the gas. May be easily damaged by being pulled in the length direction of the. On the other hand, when the slit 32 of the gas rectifying member 30 is provided on the outermost peripheral surface, the slit 32 of the gas rectifying member 30 is inserted when the inflator 10 and the gas rectifying member 30 are inserted into the gas introduction portion 22 of the airbag 20. It becomes easy to get caught in the gas introduction portion 22 of the airbag 20, and workability may be deteriorated.

As shown in FIG. 7, the slit 32 of the gas rectifying member 30 is provided with the same width or wider than the fastening band 40 at a corresponding portion overlapping with the fastening band 40. That is, in the length direction of the main body 11 of the inflator 10, both ends of the fastening band 40 are located at the same position or inside as both ends of the slit 32 of the gas rectifying member 30. Specifically, the fastening band 40 overlaps with the slit 32 of the gas rectifying member 30 via the gas introduction portion 22 of the airbag 20, and the fastening band 40 of the fastening band 40 overlaps with the length direction of the main body portion 11 of the inflator 10. The width WB is equal to or less than the widths W1, W2, and W3 of each slit 32. The cross-sectional size of the gas rectifying member 30 is reduced by the amount of the slit 32 (the portion where the flexible sheet 31 does not intervene) in the region where the slit 32 is provided. Therefore, as shown in FIG. 7, when such a region having a small cross-sectional size is fastened with the entire fastening band 40, it is between the region where the slit 32 is not provided (the region not fastened by the fastening band 40). There is a step. Therefore, even if gas is ejected from the gas ejection hole 12 of the inflator 10 and the airbag 20 (gas introduction portion 22) and the gas rectifying member 30 are pulled in the length direction of the main body portion 11 of the inflator 10, the fastening band 40 Is caught in the above-mentioned step, and the airbag 20 (gas introduction portion 22) and the gas rectifying member 30 are less likely to come off from the fastening band 40.

The flexible sheet 31 constituting the gas rectifying member 30 is not particularly limited as long as it is flexible enough to be bent along the circumferential direction of the main body 11 of the inflator 10, and is not particularly limited, for example, nylon. 66, a cloth woven with a thread such as polyethylene terephthalate (PET) is used. The surface of the flexible sheet 31 may be coated with an inorganic substance such as silicon in order to improve heat resistance. In this case, it is preferable that the flexible sheet 31 is arranged so that the surface coated with an inorganic substance such as silicon is on the inside (the main body 11 side of the inflator 10).

(Configuration Example 2)
The second configuration example is a case where the gas rectifying member 30 is configured by surrounding the outer periphery of the main body 11 of the inflator 10 in a state where a plurality of short flexible sheets are stacked. FIG. 8 is a schematic plan view showing a configuration example 2 of the gas rectifying member, FIG. 8A shows a state before the gas rectifying member is arranged around the inflator, and FIG. 8B shows a state before the gas rectifying member is arranged around the inflator. Shows the state after being placed around the inflator. FIG. 9 is a schematic cross-sectional view showing a portion corresponding to the line segment A3-A4 in FIG. 8 (b). FIG. 10 is a schematic cross-sectional view showing a portion corresponding to the line segment B3-B4 in FIG. 8 (b). FIG. 11 is a schematic cross-sectional view showing a state in which the inflator and the gas rectifying member in FIG. 8B are inserted into the gas introduction portion of the airbag and fastened by the fastening band. Configuration Example 2 is the same as Configuration Example 1 except that the number of flexible sheets constituting the gas rectifying member 30 is changed. Therefore, the description of overlapping points will be omitted as appropriate.

As shown in FIG. 8A, the short flexible sheets 31a, 31b, 31c of the plurality of sheets (three sheets in FIG. 8A) constituting the gas rectifying member 30 have a total of at least one. Three slits (three in FIG. 8A) are provided. Then, by joining the ends of the flexible sheets 31a, 31b, and 31c in a superposed state, a tubular (multilayered) gas rectifying member 30 is formed, and the main body 11 of the inflator 10 is tubular. When inserted into the gas rectifying member 30, the slits 32 are arranged along the circumferential direction of the main body 11 of the inflator 10, and the gas rectifying member 30 is arranged around the inflator 10 as shown in FIG. 8 (b). You get things. After that, a configuration as shown in FIG. 8B is inserted into the gas introduction portion 22 of the airbag 20 from the gas ejection hole 12 side of the inflator 10, and the region overlapping the slit 32 of the gas rectifying member 30 is inserted into the airbag 20. When the fastening band 40 is fastened from the outside of the gas introducing portion 22 of the above, the state as shown in FIG. 11 is obtained. That is, the gas rectifying member 30 in the multilayer state is provided with a slit 32 at a corresponding portion overlapping with the fastening band 40.

The method for forming the joint portion 34 of the flexible sheets 31a, 31b, 31c as shown in FIGS. 8 (b) and 8 (9) is not particularly limited, and examples thereof include stitching, adhesion, welding, and a combination thereof. ..

As shown in FIG. 9, the slit 32 of the gas rectifying member 30 is a state in which a laminated body of flexible sheets 31a, 31b, 31c surrounds the outer periphery of the main body 11 of the inflator 10, and the main body 11 of the inflator 10 is formed. It is provided along the circumferential direction and having a length equal to or longer than the circumferential length of the main body portion 11 of the inflator 10. As a result, the cross-sectional size of the gas rectifying member 30 is reduced by the amount of the slit 32 (the portion where the flexible sheets 31b and 31c do not intervene) in the region where the slit 32 is provided. Therefore, as shown in FIG. 11, the region where the main body portion 11 of the inflator 10, the slit 32 of the gas rectifying member 30, and the gas introduction portion 22 of the airbag 20 overlap is the area where the gas introduction portion 22 of the airbag 20 overlaps. When fastening with the fastening band 40 from the outside, the diameter of the fastening band 40 can be adjusted even if the number of flexible sheets constituting the gas rectifying member 30 is increased in order to reduce damage to the airbag 20 due to gas. It becomes unnecessary. As a specific example, when it is desired to increase the number of flexible sheets constituting the gas rectifying member 30, the corresponding portion overlapping with the fastening band 40 of the gas rectifying member 30 is the same as the peripheral length of the main body 11 of the inflator 10. The slit 32 may be provided with a length (total length). As a result, the cross-sectional size of the gas rectifying member 30 is reduced by the thickness of one flexible sheet in the region where the slit 32 is provided, so that the fastening has the same diameter as before increasing the number of flexible sheets. The band 40 can be used, and as a result, the diameter of the fastening band 40 does not need to be adjusted. Further, when it is desired to increase the number of flexible sheets constituting the gas rectifying member 30, the corresponding portion overlapping the fastening band 40 of the gas rectifying member 30 is twice the peripheral length of the main body portion 11 of the inflator 10. The slit 32 may be provided with a length (total length).

The thicknesses of the flexible sheets 31a, 31b, and 31c constituting the gas rectifying member 30 may be the same or different from each other.

As for the other components of the airbag device 1, the same components as those of the conventionally known airbag device can be appropriately used.

The present invention is not limited to the contents described in the above embodiments. Each configuration described in the embodiment may be appropriately deleted, added, modified, or combined as long as it does not deviate from the gist of the present invention.

For example, as a modification of the above embodiment, a plurality of fastening bands 40 may be provided in order to increase the fastening force. In this modification, the slits 32 of the gas rectifying member 30 may be provided in a plurality of rows along the circumferential direction of the main body portion 11 of the inflator 10. Further, the airbag device 1 can be used not only for the curtain airbag device as in the above embodiment, but also for an airbag device such as a far side airbag device in which a cylindrical inflator is used.

1: Airbag device 10: Inflator 11: Main body 12: Gas ejection hole 13: Bolt 20: Airbag 21: Main bag 22: Gas inlet 23: Fixed cloth (tab)
24: Outer peripheral joint 25: Joint 26: 1st base cloth 27: 2nd base cloth 30: Gas rectifying member 31, 31a, 31b, 31c: Flexible sheet 32: Slit 33: Bolt hole 34: Joint part 40 : Fastening band 41: Claw 50: Vehicle 51: Roof side rail 51A: Ceiling material 52: Front pillar (A pillar)
52A: Front pillar trim 53: Center pillar (B pillar)
53A: Center pillar trim L1, L2, L3: Slit length in the circumferential direction of the inflator body W1, W2, W3: Slit width in the length direction of the inflator body WB: Length direction of the inflator body Width of fastening band in

Claims (3)

An inflator having a cylindrical main body portion and a gas ejection hole provided at an end portion of the main body portion to eject gas.
An airbag having a bag-shaped main bag portion and a gas introduction portion extending from the main bag portion and into which the main body portion of the inflator is inserted.
A gas rectifying member made of a multi-layered flexible sheet arranged between the main body and the gas introduction portion of the airbag so as to surround the outer periphery of the main body of the inflator.
A fastening band for fastening a region where the main body portion of the inflator, the gas rectifying member, and the gas introduction portion of the airbag overlap from the outside of the gas introduction portion of the airbag is provided.
In the gas rectifying member in the multilayer state, at least one slit having the same width or wider than the fastening band is provided in a corresponding portion overlapping the fastening band along the circumferential direction of the main body portion of the inflator. , An airbag device provided with a length equal to or greater than the peripheral length of the main body of the inflator. The airbag device according to claim 1.
The airbag device, wherein the at least one slit is a plurality of slits provided at intervals along the circumferential direction of the main body portion of the inflator. The airbag device according to claim 1 or 2.
The gas rectifying member is an airbag device in which one flexible sheet is wound around the main body of the inflator a plurality of times.

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