JP2018172013A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag that can stably secure an exhausting suppression state during an exhausting suppression mode.SOLUTION: An air bag 19 comprises an inner pressure adjusting mechanism 30 formed to have tethers 32 and 32 which are arranged in a bag part 20 with tips 32b thereof joined to each other, in a vicinity of an exhaust port 27 opening to a peripheral wall 21 of the bag part. The inner pressure adjusting mechanism is adjusted in an exhausting mode EM in which gas G for inflation is exhausted through the exhaust port by loosening the tethers and an exhausting suppression mode RM in which the gas for inflation is suppressed from being exhausted by expanding the tethers. The inner pressure adjusting mechanism comprises a pair of opposing sheet parts 34. The tethers, which are joined to extended sheet parts 37 of the opposing sheet parts, separate opposing edge parts 36 in the exhausting mode where the tethers are loosened, and inflate the opposing edge parts and the extended sheet parts in the exhausting suppression mode where the tethers are expanded and pressure-weld surface sides 37c folded back from the opposing edge parts of the extended sheet parts to each other.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an airbag of an airbag device mounted on a vehicle, and in particular, includes an internal pressure adjusting mechanism capable of adjusting the internal pressure of an airbag by exhausting inflowing inflation gas or suppressing exhaust. Related to airbags.

  Conventionally, as an airbag of an airbag device, one using a tether as an internal pressure adjusting mechanism is known (see, for example, Patent Documents 1 and 2). When the inflating airbag protrudes from the storage part, these internal pressure adjustment mechanisms exhaust the inflation gas from the exhaust port of the internal pressure adjustment mechanism and increase the internal pressure of the airbag if the occupant approaches the storage part. To prevent the airbag from striking against an occupant who is approaching, and if the occupant is in an appropriate position that is not too close, the inflation gas Exhaust was suppressed. The configuration of such an internal pressure adjusting mechanism is a configuration in which the periphery of the exhaust port provided in the inflating bag portion is formed in a tube shape, and a tether having a predetermined length extending from the inside of the bag portion is coupled to the tube-shaped portion. I was trying.

  In such an internal pressure adjustment mechanism, if the airbag portion of the airbag inflates with the occupant approaching the storage site, the bag portion interferes with the occupant while the tether before the completion of the inflation of the bag portion is loosened. The tether remains in a relaxed state and maintains a state in which the tubular portion of the exhaust port is opened. Therefore, the inflation gas is exhausted from the exhaust port in the open state, the expansion of the bag portion is suppressed, and the bag portion can reduce the pressing force on the approaching passenger. On the other hand, if the occupant is positioned at an appropriate position where the passenger is not too close, the bag portion of the airbag smoothly protrudes from the storage portion, and the tether is stretched. Therefore, the tube-shaped portion around the exhaust port is pulled into the bag portion by being pulled by the tether, and further, the tube-shaped portion is crushed and closed by the internal pressure in the bag portion. Exhaust of the working gas was suppressed, and the bag part was able to complete the expansion quickly.

JP 2008-207579 A US Pat. No. 7,328,915

  However, in the conventional airbag, in the exhaust suppression mode, the tubular tube-shaped portion drawn into the bag portion is crushed by the internal pressure in the bag portion to close the exhaust port. Since the state is a state in which the peripheral wall of the tube-shaped part is gathered to the center side, a state in which wrinkles are generated and gathered in the center side cannot be avoided, and a state in which the expansion gas leaks from the gap between the wrinkles cannot be prevented. In particular, if the opening area of the tube-shaped part is increased so that a stable exhaust mode can be maintained, the circumferential length of the peripheral wall of the tube-shaped part is further increased, and the center of the tube-shaped part is increased in the exhaust suppression mode. The wrinkles that occur on the side increase, which further promotes gas leakage. Therefore, in the configuration of the conventional airbag, even if the mode is shifted to the exhaust suppression mode, the expansion gas leaks, and there is a problem in ensuring a stable exhaust suppression state in the exhaust suppression mode.

  The present invention solves the above-described problems, and an object thereof is to provide an airbag that can ensure a stable exhaust suppression state in the exhaust suppression mode.

An airbag according to the present invention has a peripheral wall formed from a flexible sheet material, and is inflated by an inflating gas flowing in,
An exhaust port opened in the peripheral wall so as to exhaust the inflation gas from the bag portion;
An internal pressure adjusting mechanism formed of a flexible member and having a tether disposed in the bag portion with a distal end extending from the attachment base portion coupled to the vicinity of the peripheral edge of the exhaust port. When,
Configured with
The internal pressure adjusting mechanism is in an exhaust mode that facilitates exhaust of the expansion gas from the exhaust port when the tether is loosened, and the expansion gas from the exhaust port is extended when the tether is stretched An airbag configured to adjust to an exhaust suppression mode that suppresses exhaust of
The internal pressure adjusting mechanism is
A pair of opposing sheet portions formed from members having flexibility, arranged to extend from both edges facing each other at the periphery of the exhaust port on the outer peripheral surface side of the bag portion;
The two tethers,
With
The pair of opposing sheet portions are respectively
Opposing edges extending in a strip shape so as to face each other with the exhaust port in between from the periphery of the exhaust port;
An extended sheet portion that extends from the opposite edge portion and joins the tether to the tip side near the center in the width direction;
And configured with
The pair of opposing sheet portions are
The extending sheet portions are folded back and inserted between the opposing edge portions, and the opposing edge portions and the extending sheet portion are overlapped, and orthogonal to the opposing direction of the opposing edge portions. On both sides of the direction, connected and arranged with each other,
The tether having a tip coupled to each of the extending sheet portions,
In the loose state of the tether during the exhaust mode of the internal pressure adjustment mechanism, the extended sheet portions of the pair of opposed sheet portions are respectively disposed on the back side of the opposed edge portion opposite to the exhaust port side. And having a length dimension coupled to the extending sheet portion so that the opposing edges can be separated from each other,
In a state in which the tether is stretched during the exhaust pressure suppression mode of the internal pressure adjustment mechanism, while extending the area extending from the opposing edge portion of the pair of the opposing sheet portions to the extending sheet portion, the leading end sides of the extending sheet portions As a length dimension for pulling the extension sheet part, allowing the surface side of the extension sheet part to be folded back from the opposing edge part, and entering the space between the opposing wall parts.
It is characterized by being set.

  In the airbag according to the present invention, when the inflation gas flows in a state where the airbag is folded and stored in a predetermined storage portion, the bag portion is expanded. At that time, if the tether remains loose in the exhaust mode from the beginning of the storage, the internal pressure adjusting mechanism is a portion where the tip of the tether is joined, in other words, an extended sheet of a pair of opposing sheet portions at the periphery of the exhaust port. Since the tether does not pull the part, the exhaust mode state can be maintained. That is, in the exhaust mode, the extended sheet portions of the pair of opposed sheet portions are respectively disposed on the back side opposite to the exhaust port side of the opposed edge portions, and the opposed edge portions can be separated from each other, and the expansion is performed. The working gas is exhausted from the exhaust port to the outside of the bag part through the space between the opposed edges of the pair of opposed sheet parts separated from each other.

  After that, the bag portion is inflated by increasing the internal pressure with the inflating gas flowing in, and then, when the tether is in a stretched state, the tether is connected to the tip, that is, a pair of opposing sheet portions at the periphery of the exhaust port The extended sheet portion is pulled and reversed from the back side opposite to the exhaust port to the exhaust port side so as to enter between the opposing edges. At that time, under the pressure of the expanding gas, the pair of opposing sheet portions expands the area extending from the respective opposing edge portion to the extending sheet portion, and the surface side mutually folded from the opposing edge portion in the extending sheet portion. The exhaust gas is suppressed from being exhausted from the exhaust port so that the expansion gas is retained in the areas extending from the respective facing edge portions to the extending sheet portions. At this time, the pair of opposed sheet portions are connected to each other on the both sides of the exhaust port, and the extended sheet portions are folded back and inserted between the opposed edge portions so as to extend from the opposed edge portions. In a state where the sheet portions are overlapped with each other, they are coupled to each other on both edge sides in the opposite direction and the orthogonal direction of the opposite edges. Therefore, as a cross-sectional structure in the vicinity of the extended sheet portion that is pressed against each other, a planar shape that is pressed against each other on the cylindrical inner peripheral side that is wrapped between the opposing edges of the pair of opposing sheet portions. When the exhaust port is closed by the extending sheet portion and the connecting portions at both edges in the width direction, and when the conventional tube-shaped portion is collected on the center side and the exhaust port is closed In comparison, since wrinkles are less likely to occur and the gap can be reduced, leakage of the expansion gas can be stably suppressed.

  Therefore, the airbag according to the present invention can ensure a stable exhaust suppression state in the exhaust suppression mode. Further, the internal pressure adjusting mechanism is composed of a flexible tether and an opposing sheet portion, and can be easily folded together with the bag portion, and does not hinder the folding and storing properties of the airbag.

  And in the airbag according to the present invention, the exhaust port has both edges provided with the opposing edge portions of the pair of opposing sheet portions at the periphery, compared to both edges orthogonal to the opposing direction of the opposing edge portions, It is desirable to have a long and substantially rectangular opening shape formed in a straight line.

  In such a configuration, the pair of opposing sheet portions can be arranged in a straight line along the edge of the exhaust port so that the base side of the opposing edge portion of the periphery of the exhaust port can be reversed in the exhaust suppression mode. Even when the planar portions of the extended sheet portions that are in pressure contact with each other are arranged so as to approach the base portion side of the opposite edge portion, they can be stably formed. That is, in such a configuration, the planar portions of the extended sheet portions that are pressed against each other, in other words, the mutual portions of the extended sheet portions can be brought closer to the base portion side of the opposing edge portion. As a result, the length dimension extending from the peripheral edge of the exhaust port of the opposing edge can be shortened, and the pair of opposing sheet portions can be formed without being bulky. By the way, if the exhaust port is open in a circular or oval shape, the edge on which the opposing sheet portion is disposed has an arcuate shape, and the extended sheet portions that are reversed and pressed against each other in the exhaust suppression mode If the part is not provided with a long distance from the base part in the vicinity of the exhaust port at the opposite edge part, wrinkles occur, and flatness is ensured and it becomes impossible to press-contact each other. And in order not to generate wrinkles, it is necessary to provide a long distance from the base part side of the opposing edge part so that the mutual pressure contact part of the extended sheet part can be pressed in a planar manner. Since the length dimension extended from the periphery of the exhaust port of a part will be lengthened, an opposing sheet | seat part is bulky and is not preferable.

Further, in the airbag according to the present invention, the extended sheet portions of the pair of opposed sheet portions are folded back from the end portions of the opposed edge portions to the exhaust port side of the opposed edge portions, respectively, It is possible to form a folded portion that is folded back so as to be reversed to the opposite edge side,
Each folded portion is folded back so as to be in contact with the opposing edge by providing a reversing portion between the original side extending from the end of the opposing edge and the original side, and the tether A leading edge side portion to be joined, and
A pair of the opposing sheet portions are arranged such that the folded portion is disposed on the exhaust port side of each opposed edge portion, and the original side portions of the folded portion are overlapped with each other, and In a state where the opposing edge is overlapped with the folded portion, both edges in a direction orthogonal to the opposing direction of the opposing edge are mutually coupled.
The tether having a tip coupled to each of the leading edge sides,
In the relaxed state of the tether during the exhaust mode of the internal pressure adjustment mechanism, the folded portion of each of the opposed sheet portions is disposed on the back side of the opposed edge portion opposite to the exhaust port side. And it is set as the length dimension couple | bonded with the said leading edge side part so that the said opposing edge parts can be spaced apart,
In a state where the tether is stretched during the exhaust pressure suppression mode of the internal pressure adjustment mechanism, an area extending from the opposing edge portion to the original side portion of the pair of the opposing sheet portions is inflated, and the leading end sides of the extended sheet portions are made to extend. As a length dimension for allowing the leading edge side part to be brought into contact between the opposing wall parts and allowing the surface side of the original side part folded back from the opposing edge part of the opposing sheet part to be in pressure contact with each other,
It may be set.

  In such a configuration, if the tether remains loose in the exhaust mode from the beginning of the airbag inflated and stored, the part where the tether tips are joined, in other words, the extended sheet of the pair of opposed seats Since the tether does not pull the leading edge side portion in the portion, the folded portion of each opposing sheet portion is disposed on the back side opposite to the exhaust port side in the opposing edge portion, and the opposing edge portions mutually Can be separated, and the inflation gas is exhausted from the exhaust port to the outside of the bag part through the gap between the opposed edges of the pair of spaced opposed sheet parts.

  After that, the bag portion expands by increasing the internal pressure with the inflowing gas, and when the tether is in a tensioned state, the leading edge side portion of the extending sheet portion of each opposing sheet portion is pulled, and the exhaust port The leading edge side portion and the original side portion are caused to enter between the opposite edge portions so as to be reversed from the reverse side to the exhaust port side. At that time, under the pressure of the expanding gas, the pair of opposed sheet portions expands the area extending from the respective opposed edge portion to the extended sheet portion, and the original side portion folded from the opposed edge portion in the extended sheet portion. Exhaust gas of the expansion gas from the exhaust port is suppressed so as to keep the expansion gas in the area extending from the respective opposing edge portions to the original side portion of the extending sheet portion. At this time, the pair of opposing sheet portions are inserted in the folded state of the extending sheet portion between the opposing edge portions as a coupled state at the both sides of the exhaust port, and each folded portion is Folding of the opposing edge and the extended sheet part is provided so that a reversing part is provided between the original side part folded back from the opposing edge part and the leading edge side part folded back so as to be in contact with the opposing edge part is disposed. In a state where the portions are overlapped with each other, they are connected to each other on both edge sides in the opposite direction and the orthogonal direction of the opposite edges. Therefore, the expansion gas enters between the original side portion of the folded portion where the surface sides are in pressure contact with each other and the leading edge side portion that extends from the original side portion and is reversed by the reversing portion, and the leading edge side portion Even if the wire is pulled by the tether, the leading edge side portion is reversed from the original side portion at the reversing portion so that the pressure is applied from the original side portion to the inner peripheral side of the leading edge side portion to return to the coupled state. . The cross-sectional structure in the vicinity of the pressure-contacted original side portion is a planar extension that is pressed against each other on the cylindrical inner circumference side that is wrapped around the opposing edges of the pair of opposing sheet portions. The exhaust port is closed by the original side portion of the seat portion and the connecting portions at both edges in the width direction, and the conventional tubular portion is collected on the center side to close the exhaust port. Compared to the case, wrinkles are less likely to occur and the gap can be reduced, so that the leakage of the expansion gas can be stably suppressed.

  And in this structure, the front edge side part reversed by the inversion part is arrange | positioned in the outer peripheral side (opposite edge part side) of the site | part of the original side parts of the planar extension sheet | seat part mutually press-contacted Thus, even if the tether is loosened, the inverted leading edge side portions are unlikely to return so as to enter between the pressure-contacted original side portions, and as a result, the expansion gas does not leak. That is, in such a configuration, even if the tether is loosened, if the internal pressure is generated in the bag portion, it is difficult to exhaust the inflation gas from the exhaust port, so that a more stable exhaust suppression mode can be secured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal sectional view of a passenger seat airbag device in a vehicle mounted state in which an airbag according to a first embodiment of the present invention is used. It is the schematic perspective view seen from the front side of the state which inflated the airbag of 1st Embodiment alone, and also shows the partial expansion perspective view of the exhaust port periphery at the time of exhaust mode. It is a schematic longitudinal cross-sectional view along the front-back direction of the airbag of FIG. FIG. 3 is a schematic front view, a schematic vertical cross-sectional view, and a schematic horizontal cross-sectional view of the periphery of the exhaust port when the airbag of FIG. FIG. 3 is a schematic front view and a schematic longitudinal sectional view of the periphery of an exhaust port when the airbag of FIG. It is a figure explaining the inflation process at the time of the action | operation of the airbag in 1st Embodiment, and the state which the passenger | crew approaches is shown. It is a figure explaining the inflation process at the time of the action | operation of the airbag in 1st Embodiment, and shows the state which a passenger | crew is located in an appropriate position. It is a schematic longitudinal cross-sectional view explaining in order the state which transfers to the exhaust_gas | exhaustion suppression mode from the exhaust mode of the internal pressure adjustment mechanism of 1st Embodiment. It is a figure explaining the manufacturing process of the internal pressure adjustment mechanism of the airbag of 1st Embodiment in order. It is a figure explaining the manufacturing process of the internal pressure adjustment mechanism of the airbag of 1st Embodiment in order, and demonstrates the process after FIG. It is the schematic perspective view seen from the front side of the state which inflated the airbag of 2nd Embodiment alone, and also shows the partial expansion perspective view of the exhaust port periphery at the time of exhaust mode. It is a schematic longitudinal cross-sectional view along the front-back direction of the airbag of FIG. FIG. 12 is a schematic front view, a schematic vertical cross-sectional view, and a schematic horizontal cross-sectional view of the exhaust port periphery when the airbag of FIG. 11 is in the exhaust suppression mode. It is the schematic front view and schematic longitudinal cross-sectional view of the exhaust port periphery at the time of the exhaust mode of the airbag of 2nd Embodiment. The case where the passenger | crew at the time of the action | operation of the airbag in 2nd Embodiment is approaching, and the case where a passenger | crew is located in an appropriate position are shown. It is a schematic longitudinal cross-sectional view explaining in order the state which transfers to the exhaust_gas | exhaustion suppression mode from the exhaust mode of the internal pressure adjustment mechanism of 2nd Embodiment. It is a figure explaining the manufacturing process of the internal pressure adjustment mechanism of the airbag of 2nd Embodiment in order. It is a figure explaining the manufacturing process of the internal pressure adjustment mechanism of the airbag of 2nd Embodiment in order, and demonstrates the process after FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the first embodiment, as shown in FIG. 1, an airbag 19 used in a passenger seat airbag apparatus M will be described as an example. The passenger seat airbag device M is disposed in front of the passenger seat, and as shown in FIG. 1, the passenger seat airbag device M is provided inside the instrument panel (hereinafter abbreviated as “instrument panel”) 1 below the windshield 4. It is supposed to be a top mount type. The airbag device M includes a folded airbag 19, an inflator 8 that supplies an inflation gas to the airbag 19, a case 12 as a storage part that stores and holds the airbag 19 and the inflator 8, A retainer 9 for attaching the inflator 8 to the case 12 and an airbag cover 6 covering the folded airbag 19 are provided.

  The airbag cover 6 is formed integrally with the instrument panel 1 made of synthetic resin, and is configured to include two door portions 6a and 6b that are pushed by the airbag 19 at the time of deployment and inflated and open to the front and rear sides. . Further, a connecting wall portion 6 c connected to the case 12 is formed around the door portions 6 a and 6 b in the airbag cover 6. A locking hole 6d for locking the locking claw 12c of the case 12 is formed in the connecting wall portion 6c.

  The inflator 8 includes a substantially cylindrical main body portion 8 a having a plurality of gas discharge ports 8 b and a flange portion 8 c for attaching the inflator 8 to the case 12.

  The case 12 as a storage part is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening on the upper end side, a substantially rectangular plate-shaped bottom wall portion 12a attached by inserting the inflator 8 from below, and a bottom wall And a peripheral wall portion 12b that extends upward from the outer peripheral edge of the portion 12a and engages the connecting wall portion 6c of the airbag cover 6. At the upper end of the peripheral wall portion 12b, a locking claw 12c that is inserted into the locking hole 6d of the connecting wall portion 6c and locks the connecting wall portion 6c is formed.

  In the case of the embodiment, the airbag 19 and the inflator 8 are attached to the periphery of an inflow opening 23 to be described later in the airbag 19 using the bolts 9a of the retainer 9 disposed in the airbag 19 as attachment means. It is attached to the bottom wall portion 12 a of the case 12 by passing through the seat 22, the bottom wall portion 12 a of the case 12, and the flange portion 8 c of the inflator 8 and fastening the nut 10. Further, a bracket (not shown) connected to the vehicle body side is disposed on the bottom wall portion 12a of the case 12.

  As shown in the two-dot chain line in FIG. 1 and FIGS. 2 and 3, the airbag 19 is inflated by inflating an inflating gas. A substantially bag-shaped bag portion 20 that can be disposed so as to close the space, an exhaust port 27 that opens to the peripheral wall 21 of the bag unit 20 so as to exhaust the expansion gas G from the bag unit 20, and an expansion from the exhaust port 27 And an internal pressure adjusting mechanism 30 for adjusting the presence or absence of exhaust of the working gas G.

  The bag portion 20 includes a peripheral wall 21 made of a sheet material such as a woven fabric made of polyamide having flexibility, and as shown in FIGS. 2 and 3, the expansion completion shape is arranged on the front end side. It has a substantially quadrangular pyramid shape. The peripheral wall 21 when the inflation is completed includes a rear wall portion 21a on the passenger side, an upper wall portion 21b, a lower wall portion 21c, a left wall portion 21d, and a right wall portion extending forward from the top, bottom, left, and right of the periphery of the rear wall portion 21a. 21e. An inflow opening 23 is formed in a substantially circular center of the lower wall portion 21c near the front end when the expansion of the bag portion 20 is completed. The peripheral edge of the inflow opening 23 serves as a mounting seat 22 that is attached to the bottom wall portion 12a of the case 12, and a plurality of bolts 9a of the retainer 9 are inserted into the bottom wall portion 12a of the case 12 (in the case of the embodiment). 4) mounting holes 24 are formed. In the case of the embodiment, the rear wall portion 21a is provided with a concave portion 21aa recessed in the front side along the vertical direction in the center in the left-right direction.

  The exhaust port 27 is disposed on the front side of the left and right left wall portions 21d and the right wall portion 21e, and has a narrow and vertically long rectangular shape (slit shape) formed so as to extend in the vertical direction. Is open.

  In addition, a vent hole 25 for exhausting excess inflation gas G after completion of inflation of the bag portion 20 is also opened on the rear side of the left wall portion 21d and the right wall portion 21e of the peripheral wall 21.

  The internal pressure adjusting mechanism 30 includes two flexible tethers 32 made of polyamide woven fabric and the like, and a pair of opposing sheet portions 34 (34F, 34B). In the internal pressure adjusting mechanism 30, the exhaust ports 27 are provided at two locations of the left wall portion 21d and the right wall portion 21e of the bag portion 20, and in the case of the embodiment, corresponding to the two exhaust ports 27, It is arranged in two places.

  Each tether 32 has a tip 32 b extending from the attachment base 32 a coupled to the periphery of the exhaust port 27. In the case of the embodiment, two tethers 32 are provided corresponding to the left and right exhaust ports 27, respectively, and both of the attachment bases 32a are located in the vicinity of the center of the lower wall portion 21c of the bag portion 20 in the left-right direction. It is joined to the part near the rear wall 21a by sewing. The distal ends 32b of the two right and left tethers 32 corresponding to the left and right exhaust ports 27 are joined by sewing to extended sheet portions 37, which will be described later, at the periphery of each exhaust port 27. Specifically, on the inner side surface 37d of the extending sheet portion 37 that is continuous with the inner side surface 36d on the exhaust port 27 side of the facing edge portion 36, which will be described later, near the center in the width direction of the leading edge 37b of the extending sheet portion 37, The tip 32b is coupled (see B in FIG. 10).

  In the case of the embodiment, the internal pressure adjusting mechanism 30 has an exhaust mode EM that facilitates exhaust of the expansion gas G from the exhaust port 27 when each tether 32 is loosened, as shown in FIGS. When the tether 32 is stretched, the exhaust gas suppression mode RM is adjusted to suppress the exhaust gas G from the exhaust port 27. Specifically, the state in which the tether 32 is stretched is a state in which the rear wall portion 21a of the bag portion 20 exceeds the rear surface 3 of the instrument panel 1 and the mounting base portion 32a is disposed at the retracted position BP at the rear of the rear surface 3. Yes (see B in FIG. 7), in that case, the internal pressure adjustment mechanism 30 is in the exhaust suppression mode RM, and the tether 32 is loosened at the front side of the retracted position BP, for example, in the vicinity of the rear surface 3, for example. (See B in FIG. 6), the internal pressure adjustment mechanism 30 is in the exhaust mode EM. The state in which the tether 32 is loose is maintained even when the bag portion 20 is inflated if the mounting base portion 32a is positioned in front of the retracted position BP. As shown in FIGS. When hitting the close occupant IP, the tether 32 is maintained in a relaxed state without being stretched.

  As described above, each tether 32 has a width dimension smaller than the width direction of the portion (the leading edge 37b of the extended sheet portion 37) to which the leading end 32b is coupled, and the tether 32 is coupled to the center in the width direction of the leading edge 37b. I am letting.

  As shown in FIGS. 4 and 5, the pair of opposing sheet portions 34 (F, B) of the internal pressure adjusting mechanism 30 are straight lines opposed to each other at the peripheral edge 28 of the exhaust port 27 on the outer peripheral surface 20 a side of the bag portion 20. It is formed so as to extend from both long edges 28a and 28b, and is formed from a flexible member. The pair of opposing sheet portions 34 (F, B) extend from the opposing edge portion 36 and the opposing edge portion 36 extending in a strip shape so as to face each other with the exhaust port 27 interposed therebetween from the peripheral edge 28 of the exhaust port 27. And an extended sheet portion 37 to which the tether 32 is coupled at the front end side near the center in the width direction.

  In the basic arrangement state (basic arrangement state or initial coupling state), the pair of opposing sheet portions 34 are respectively provided with an extending sheet portion 37 on the inner side surface 36d side on the exhaust port 27 side of the opposing edge portion 36. A direction (width) perpendicular to the opposing direction of the opposing edge 36 in a state where the opposing edge 36 and the extending sheet 37 are overlapped and the extending sheet 37 is overlapped. Both edges 36a in the direction) are coupled to each other with the extending sheet portions 37 and 37 interposed therebetween (see FIG. 10). This initial combined state is substantially the same as the state in which the expansion gas G is removed from the inner peripheral side of the extending sheet portion 37 from the swelled opposing edge portion 36 in the longitudinal cross-sectional shape of the exhaust suppression mode RM (FIG. 4). B and brackets in FIG. 10 B).

  In addition, as a length dimension from the periphery of the exhaust port 27 of the opposing sheet | seat part 34, the length dimension L2 of the extension sheet | seat part 37 is shortened rather than the length dimension L1 of the opposing edge part 36, and the opposing edge part 36 is shown. The end portion 37b of the extended sheet portion 37 folded back at the end portion 36b is set so as not to enter the bag portion 20 through the exhaust port 27 (see FIGS. 9 and 10).

  Moreover, as the width dimension of the opposing sheet part 34, the width dimension W1 of the opposing edge part 36 and the extended sheet part 37 is the opening width of the up-down direction of the long side of the exhaust port 27 of the bag part 20 in the unexpanded state. It is substantially equivalent to WV (see FIG. 9).

  In the case of the embodiment, the pair of opposing sheet portions 34 are each formed from an opposing sheet base fabric 62 shown in FIG. 9A. Similar to the peripheral wall 21 of the bag portion 20, the opposing sheet base fabric 62 is formed of a flexible woven fabric such as polyamide. The facing sheet base fabric 62 has a width W1 that is greater than the width W0 of the mounting edge 35 and the mounting edge 35 that are joined to the front edge 28a and the rear edge 28b of the peripheral edge 28 of the exhaust port 27 by sewing. A rectangular plate-shaped facing edge 36 that is long and extending in the width direction as a band extending from the mounting edge 35, and an extending sheet portion 37 having the same width W1 extending from the facing edge 36. ing.

  As shown in FIGS. 9A and 9B, the step of forming the pair of opposing sheet portions 34 (F, B) is performed by overlapping the portions of the mounting edge portions 35 of the opposing sheet base fabrics 62, 62, and Then, the extended sheet portion 37 side is folded at the end portion 36b of the opposed edge portion 36, and the extended sheet portion 37 is overlaid on the inner side surface 36d side of the opposed edge portion 36 (see B in FIG. 10 and parentheses). Then, the opposing edges 36a and 37a in the width direction of the pair of opposing sheet base fabrics 62 and the edges 36a, 37a of the extended sheet 37 and the edges of the attachment edge 35 that are continuous from these edges are connected to the suture thread. If it couple | bonds using 60 and the coupling | bond part 38 is formed, the member 63 for opposing sheets can be formed. The coupling portion 38 is formed in an arc shape so as to spread in the width direction at the opposite edge portion 36 and the straight portion 38a on both sides 36a, 37a in the width direction of the extending sheet portion 37 and the end of the straight portion 38a. And a curved portion 38b extending toward the side edge 35b in the width direction of the mounting edge 35.

  Then, as shown in FIGS. 9B and 9C, the mounting edge portions 35 and 35 of the facing sheet member 63 are opened, and the front and rear edges 28c and 28d of the peripheral edge 28 of the exhaust port 27 of the bag portion 20 are also included. When the peripheral edges of the attachment edge portions 35 and 35 are joined to the edge 28a side and the rear edge 28b side using the suture thread 60 to form the joint portions 35a and 35a, a pair of the peripheral edge 28 of the exhaust port 27 is formed. The counter sheet portion 34 can be formed. Note that the coupling portion 35a is disposed so as to overlap the curved portion 38b of the coupling portion 38 as well.

  Thereafter, as shown in FIGS. 10A and 10B, if the tip 32b of each tether 32 is coupled to the inner side surface 37d of the corresponding extended sheet portion 37, the internal pressure adjusting mechanism 30 can be formed, and the air The bag 19 can be manufactured.

  Each tether 32 has, for example, an attachment base 32a previously connected to a predetermined position of the peripheral wall 21, and after the counter sheet member 63 is connected to the peripheral wall 21, the exhaust port 27 is inserted and the tip 32b is inserted. The side may be coupled to the extended sheet portion 37 as described above. Further, before the tether 32 is disposed, the inflow opening 23 and the mounting seat 22 are formed in the bag portion 20 in advance.

  In the state where the tether 32 is stretched in the exhaust gas suppression mode RM of the internal pressure adjusting mechanism 30 (see FIG. 4), each of the disposed tethers 32 is disposed on the outer peripheral surface 20a side of the bag portion 20. As a state, the end (leading edge) 37b side of the extended sheet portion 37 is opposed to the opposite edge portion while the area extending from the opposed edge portion 36 to the extended sheet portion 37 of the pair of opposed sheet portions 34 (F, B) is expanded. 36 and 36, and the surface side (outer surface) 37c folded back from the opposite edge portion 36 of the extended sheet portion 37 can be pressed against each other (the actual pressing state is indicated in parentheses in FIG. 4B). As shown, the surface sides 37c and 37c are in close contact with each other), and the length dimension LT (see FIG. 7) for pulling the extended sheet portion 37 is used. Further, each tether 32 has the extended sheet portion 37 of the pair of opposed sheet portions 34 at the opposed edge portion 36 in the loose state of the tether 32 in the exhaust mode EM of the internal pressure adjusting mechanism 30 (see FIG. 5). The length LT is arranged on the back surface 36c side opposite to the exhaust port 27 side, and is coupled to the extended sheet portion 37 so that the opposing edge portions 36 can be separated from each other.

  After the airbag 19 is manufactured by attaching the internal pressure adjusting mechanism 30 to the bag portion 20, first, the bolts 9 a are protruded from the attachment holes 24 so that the airbag device M can be mounted on the vehicle. Is stored in the bag portion 20, and the bag portion 20 of the airbag 19 is folded together with the tether 32. Next, the airbag 19 is wrapped with a wrapping material (not shown) for preventing collapse so as not to collapse.

  When the airbag 19 is folded, the internal pressure adjusting mechanism 30 is folded in the state of the exhaust mode EM shown in parentheses in FIG. 2 or FIG. That is, the end 32 b of the counter edge 36 is folded so that the tip 32 b side of the tether 32 is extended from the exhaust port 27, and the extended sheet part 37 is folded on the back surface 36 c side of the counter edge 36. In that state, the airbag 19 is folded. Incidentally, the state in which the extending sheet portion 37 is folded on the back surface 36c side of the opposed edge portion 36 is reversed around the opposed edge portions 36 and 36 formed in a cylindrical shape by the joined edges 36a and 37a. It will be in the state which the cylindrical extension sheet | seat parts 37 and 37 of a state enclose.

  After wrapping the folded airbag 19 with the wrapping material, the bolts 9a are protruded from the bottom wall portion 12a of the case 12 so that the folded airbag 19 is accommodated in the case 12, and the inflator 8 While inserting the main body portion 8a into the case 12 from below the bottom wall portion 12a of the case 12, the bolts 9a protruding from the bottom wall portion 12a are inserted into the flange portion 8c of the inflator 8, and the flange of the inflator 8 is inserted. If the nut 10 is fastened to each bolt 9 a protruding from the portion 8 c, the airbag 19 can be attached to the case 12 together with the inflator 8. Then, with respect to the connecting wall portion 6c of the airbag cover 6 in the instrument panel 1 mounted on the vehicle, the locking claw 12c is inserted into the locking hole 6d, and the peripheral wall portion 12b of the case 12 is locked. If the predetermined bracket (not shown) is fixed to the vehicle body side, the airbag apparatus M can be mounted on the vehicle.

  If the inflation gas is discharged from each gas outlet 8b of the inflator 8 after the airbag device M is mounted on the vehicle and the vehicle collides, the airbag 19 is inflated by flowing the inflation gas into the interior. The wrapping material (not shown) is broken and the doors 6a and 6b of the airbag cover 6 are pushed and opened, and the doors 6a and 6b of the airbag cover 6 are pushed and opened. While projecting upward, it expands and expands while projecting toward the rear side of the vehicle, and as shown by a two-dot chain line in FIG. The expansion will be completed.

  At that time, as shown in FIGS. 6A and 6B, the inner pressure adjusting mechanism 30 is such that the rear wall 21a of the bag portion 20 interferes with the adjacent occupant IP, and the tether 32 moves the attachment base portion 32a to the retracted position BP (FIG. 7 (see B of FIG. 7), and a state where the front end of the tether 32 is joined, that is, a portion where the tip 32b of the tether 32 is coupled, that is, a pair of facings at the peripheral edge 28 of the exhaust port 27 is reached. The tether 32 does not pull the extended sheet portions 37 of the sheet portion 34. Therefore, the exhaust mode EM state can be maintained as shown in FIG. That is, in the exhaust mode EM, the extended sheet portions 37 of the pair of opposed sheet portions 34 are respectively disposed on the back surface 36c side opposite to the exhaust port 27 side of the opposed edge portion 36, and the opposed edge portions 36 are mutually connected. The inflation gas G is exhausted from the exhaust port 27 to the outside of the bag portion 20 through the space between the opposed edge portions 36 of the pair of separated opposed sheet portions 34 (F, B).

  Therefore, the airbag 19 does not press strongly even if it interferes (contacts) with the adjacent occupant IP during the initial inflation, and continues to exhaust the inflation gas G from the exhaust port 27 to reach the inflation completed shape. Without completing the operation of the airbag apparatus M.

  Further, when the airbag apparatus M is operated in a state where the occupant PP is located at an appropriate position away from the instrument panel 1, the airbag section 20 flows into the airbag 19 as shown in FIGS. If the internal pressure is increased by the expansion gas G to expand, and then the tether 32 is in a stretched state, as shown in FIGS. 8A and 8B, the tether 32 is connected to the tip 32b, that is, the exhaust gas. The extended sheet portions 37 of the pair of opposed sheet portions 34 at the peripheral edge 28 of the opening 27 are pulled and reversed from the back surface 36 c side opposite to the exhaust port 27 to the exhaust port 27 side so as to face each other. Try to get in between. At that time, under the pressure of the expansion gas G, the pair of opposing sheet portions 34 (F, B) inflate areas extending from the respective opposing edge portions 36 to the extending sheet portion 37, and in the extending sheet portion 37. The surface side (outer surface) 37c folded back from the opposing edge portion 36 is brought into pressure contact with each other, and the expansion gas G is retained in an area extending from each opposing edge portion 36 to the extending sheet portion 37. The exhaust of the expansion gas G is suppressed. At this time, the pair of opposed sheet portions 34 are connected to each other on the upper and lower edges 28c and 28d of the exhaust port 27, and the extended sheet portions 37 and 36 are disposed between the opposed edge portions 36 and 36, respectively. 37 is folded and inserted so that the opposing edge 36 and the extending sheet part 37 are overlapped with each other on both sides 36a, 37a in the direction orthogonal to the opposing direction of the opposing edges 36, 36. (See B in FIG. 9). Therefore, as a cross-sectional structure in the vicinity of the extended sheet portions 37 and 37 that are in pressure contact with each other, as shown in FIG. 4C, the opposed edge portions 36 and 36 in the pair of opposed sheet portions 34 (F and B). An exhaust port is formed by the portions of the planar extending sheet portions 37 and 37 that are pressed against each other on the inner peripheral side of the tubular envelope and the joint portions of both edges 37a and 37a in the width direction. Compared with the case where the conventional tube-shaped part is gathered to the center side and the exhaust port is closed, wrinkles are less likely to occur and the gap can be reduced, so that the expansion gas G can be leaked stably. Can be suppressed.

  Therefore, in the airbag 19 of the first embodiment, a stable exhaust suppression state in the exhaust suppression mode can be ensured. The internal pressure adjusting mechanism 30 includes a flexible tether 32 and an opposing sheet portion 34, and can be easily folded together with the bag portion 20, so that the airbag 19 can be folded and stored. Does not disturb.

  And in 1st Embodiment, the exhaust port 27 provided in the surrounding wall 21 of the bag part 20 has both edges 28a which provided the opposing edge parts 36 and 36 of a pair of opposing sheet | seat part 34 (F, B) in the periphery 28, The opening 28b has a substantially vertically long rectangular opening shape (in the embodiment, a slit shape) that is long and straight compared to both edges 28c, 28d orthogonal to the facing direction of the facing edges 36, 36.

  Therefore, in the embodiment, the pair of opposed sheet portions 34 (F, B) are respectively arranged in a straight line along the edges 28a, 28b on the base portion 36e side of the opposed edge portion 36 of the peripheral edge 28 of the exhaust port 27. Therefore, the planar portion 37e of the extended sheet portions 37 and 37 that are reversed and pressed against each other in the exhaust suppression mode RM (the planar shape along the straight edges 28a and 28b) is formed as a counter edge 36. Even if it is arranged so as to be close to the base portion 36e side, it can be formed stably. That is, in such a configuration, the planar portion 37e of the extended sheet portion 37, 37 that is in pressure contact with each other, in other words, the predetermined portion 37e of the extended sheet portion 37 is replaced with the origin of the opposing edge portion 36. As a result, the length dimension L1 extending from the peripheral edge 28 of the exhaust port 27 of the opposing edge 36 can be shortened, and the pair of opposing sheet portions 34 can be formed without being bulky. Incidentally, if the exhaust port 27 is opened in a circular shape, the edges 28a and 28b on which the opposing sheet portion 34 is disposed have an arcuate shape, and are extended sheets that are reversed and pressed against each other in the exhaust suppression mode RM. If the portion 37e of the portions 37 and 37 is not provided with a long distance from the base portion 36e, wrinkles are generated, and flatness is ensured so that they cannot be brought into pressure contact with each other. It is necessary to provide a long distance from the base portion 36e so that the portion 37e of the sheet portions 37 and 37 can be pressed in a flat shape, and the length dimension L1 extending from the peripheral edge 28 of the exhaust port 27 of the opposing edge portion 36 is long. Thus, the opposing sheet portion is bulky, which is not preferable.

  Of course, if the above points are not taken into consideration, the exhaust port 27 has a circular or oval shape, or an opening shape such as a rectangular shape in which the lengths on the edges 28c and 28d side where the opposing sheet portions 34 and 39 are not provided are increased. It is good.

  In the case where tethers are coupled to the extended sheet portions of the pair of opposing sheet portions, respectively, the internal pressure adjustment mechanism 30A of the airbag 19A of the second embodiment shown in FIGS.

  The internal pressure adjusting mechanism 30A of the airbag 19A of the second embodiment lengthens the extended sheet portion 37 in the pair of opposing sheet portions 34 of the internal pressure adjusting mechanism 30 of the first embodiment (see A in FIG. 17), and The part (the leading edge side portion 44) extended long is formed in a shape folded back to the opposing edge portion 36 side (refer to parentheses in FIG. 18B). In the airbag 19A of the second embodiment, the extended sheet portion 43 of the pair of opposed sheet portions 39 is configured to be longer than the opposed sheet portion 34 of the first embodiment, and the front end side is reversed to face the airbag 19A. The only difference from the first embodiment is that it is folded back toward the edge 41 and joined to the opposing edge 41. The bag portion 20, the exhaust port 27 provided in the bag portion 20, and the tether 32 are different. Is the same as that of the first embodiment, and is used by being mounted on a vehicle as a passenger seat airbag device M (see FIG. 15), as in the first embodiment.

  In the second embodiment, as shown in FIG. 18, the extended sheet portions 43 of the pair of opposed sheet portions 39 provided on the front and rear edges 28 a and 28 b of the peripheral edge 28 of the exhaust port 27 are respectively opposed edge portions 41 ( On the exhaust port 27 side of F, B), a folded portion 50 that is folded back from the end 41b of the opposed edge 41 and further reversed to the opposed edge 41 can be formed.

  Each folded portion 50 is folded back so as to be in contact with the opposing edge 41 by providing an inversion portion 46 between the original side 48 extending from the end 41b of the opposing edge 41 and the original side 48. And a leading edge side portion 44 to which the tip 32b of the tether 32 is coupled. The tip 32b of the tether 32 is sewn to the tip 44b near the center in the width direction on the outer periphery 44c continuously connected to the front edge side 44 from the back surface 41c opposite to the exhaust port 27 side of the opposing edge 41. Are combined.

  In the basic arrangement state (basic arrangement state or initial connection state), the pair of opposing sheet portions 39 are arranged with the folding portions 50 on the exhaust port 27 side of the respective opposing edge portions 41 and folded. In a state where the original side portions 48 of the overlapping portion 50 are overlapped with each other and each opposing edge portion 41 is overlapped with the folded portion 50, both of the directions in the direction orthogonal to the opposing direction of the opposing edge portion 41 are both. The edges 41a and 41a are coupled to each other with the widthwise edges 48a and 44a of the original side portion 48 of the folded portion 50 and the leading edge side portion 44 interposed therebetween (see FIG. 18). This initial combined state is substantially the same as the state in which the expansion gas G is removed from the inner peripheral side of the area extending from the swelled opposing edge portion 41 to the extending sheet portion 43 in the longitudinal cross-sectional shape of the exhaust suppression mode RM ( (See B in FIG. 13 and B in FIG. 18).

  In addition, as shown in FIG. 17, the length dimension from the periphery of the exhaust port 27 of the opposing sheet | seat part 39 is the length of the folding part 50 of the extension sheet | seat part 43 from the length dimension L1 of the opposing edge part 41. As shown in FIG. The length L3 is shortened, and the end portion 50b of the folded portion 50 folded back at the end portion 41b of the opposing edge portion 41 is set so as not to enter the bag portion 20 through the exhaust port 27 (see FIG. (See 18 B in parenthesis). The original side portion 48 and the leading edge side portion 44 of the extended sheet portion 43 have substantially the same length dimensions L4 and L5.

  Moreover, as the width dimension of the opposing sheet part 39, the width dimension W1 of the opposing edge part 36 and the extended sheet part 37 is the opening width of the up-down direction of the long side of the exhaust port 27 of the bag part 20 in the unexpanded state. It is substantially equivalent to WV.

  In the case of the embodiment, the pair of opposing sheet portions 39 are each formed from an opposing sheet base fabric 65 shown in FIG. Similar to the peripheral wall 21 of the bag portion 20, the opposing sheet base fabric 65 is formed of a woven fabric such as polyamide having flexibility. The opposing sheet base fabric 65 has a width W1 that is greater than the width W0 of the mounting edge 40 and the mounting edge 40 that are joined by sewing to the front edge 28a and the rear edge 28b of the peripheral edge 28 of the exhaust port 27. A rectangular plate-shaped opposing edge 41 that is long and extending in the width direction as a band extending from the attachment edge 40, and an extending sheet 43 having the same width dimension W1 that extends from the opposing edge 41 are configured. ing.

  As shown in FIGS. 17A and 17B, the step of forming the pair of opposing sheet portions 39 (F, B) overlaps the portions of the mounting edge portions 40 of the opposing sheet base fabrics 65, 65, and The inner side surface of the original side portion 48 is folded at the reversal portion 46 of the extended sheet portion 43 and the leading edge side portion 44 of the extended sheet portion 43 is connected to the inner side surface 41d on the exhaust port 27 side of the opposing edge portion 41. It is overlapped on the 48b side, and further folded at the end 41b of the opposing edge 41, with the leading edge side 44 approaching the inner surface 41d side of the opposing edge 41 and folded toward the exhaust port 27 side of the opposing edge 41. The overlapping portions 50 are overlapped (see B and parentheses in FIG. 18). Then, the opposite edges 41 and 44a and 48a in the width direction of the overlapped pair of opposing sheet base fabrics 65 and the edges of the attachment edge 40 connected from these edges are sewn together. If it couple | bonds using the thread | yarn 60 and the coupling | bond part 52 is formed, the member 66 for opposing sheets can be formed. In addition, the coupling | bond part 52 is the width direction of the edge part 41a, 44a, 48a side linear part 52a of the opposing edge part 41 and the extension sheet | seat part 43 (folding part 50), and the terminal of the linear part 52a. And a curved portion 52b extending toward the side edge 40b in the width direction of the mounting edge portion 40.

  Then, as shown in FIGS. 17B and 17C, the mounting edge portions 40 and 40 of the facing sheet member 66 are opened, and the upper and lower edges 28c and 28d at the peripheral edge 28 of the exhaust port 27 of the bag portion 20 are also included. When the peripheral edges of the attachment edge portions 40, 40 are joined to the edge 28a side and the rear edge 28b side using the suture thread 60 to form the joint portions 40a, 40a, The opposing sheet portion 39 can be formed. The coupling portion 40a is also disposed so as to overlap with the curved portion 52b of the coupling portion 52.

  Thereafter, as shown in FIGS. 18A and 18B, if the tip 32b of each tether 32 is coupled to the outer periphery 44c side of the leading edge side portion 44 of the corresponding extended sheet portion 43, the internal pressure adjusting mechanism 30A is formed. The airbag 19A can be manufactured.

  Each tether 32 has, for example, an attachment base 32a previously connected to a predetermined position of the peripheral wall 21, and after the counter sheet member 66 is connected to the peripheral wall 21, the exhaust port 27 is inserted and the tip 32b is inserted. The side may be coupled to the extended sheet portion 43 as described above. In addition, before the tether 32 is disposed, the inflow opening 23 and the mounting seat 22 are formed in the bag portion 20 in advance, as in the first embodiment.

  In the state where the tether 32 is stretched in the exhaust gas suppression mode RM of the internal pressure adjusting mechanism 30A (see FIG. 13), each of the arranged tethers 32 is provided with the extended sheet portion 43 on the outer peripheral surface 20a side of the bag portion 20. As a state, an area extending from the opposing edge 41 to the original side portion 48 in the pair of opposing sheet portions 39 is expanded, and the distal end (leading edge) side (reverse portion 46 side) of the extended sheet portions 43 is opposed to the opposing edge portion 41. A length dimension LT that pulls the leading edge side portion 44 so as to be able to press the surface side (outer side surface 48c) of the original side portion 48 that has entered between them and folded back from the opposite edge portion 41 of the opposite sheet portion 39 (see FIG. 15 B)). In addition, each tether 32 is configured so that the folded portion 50 of each opposing sheet portion 39 is exhausted at the opposing edge 41 while the tether 32 is loosened (see FIG. 14) in the exhaust mode EM of the internal pressure adjusting mechanism 30A. A length dimension LT that is disposed on the back surface 41c side opposite to the mouth 27 side and is coupled to the leading edge side portion 44 so as to be able to separate the opposing edge portions 41 from each other is set.

  The airbag 19A manufactured by combining the tether 32 is assembled as an airbag apparatus M in which the retainer 9 is accommodated and folded, accommodated in the case 12, and the inflator 8 is disposed, as in the first embodiment. It will be mounted on the vehicle.

  When the airbag 19A is folded, the internal pressure adjustment mechanism 30A is folded in the state of the exhaust mode EM shown in parentheses in FIG. 11 or FIG. That is, the front end 32 b side of the tether 32 is extended from the exhaust port 27, is folded at the end portion 41 b of the opposing edge portion 41, and the folded portion 50 composed of the extended sheet portion 43 is formed on the back surface 41 c side of the opposing edge portion 41. The airbag 19A is folded in this state. Incidentally, the state where the folded portion 50 formed of the extended sheet portion 43 is folded on the back surface 41c side of the opposed edge portion 41 is the opposite edge portion 41, which is formed in a cylindrical shape by the combined edges 41a, 44a, 48a. The cylindrical original side portions 48 and 48 of the extended sheet portions 43 and 43 in an inverted state and the cylindrical leading edge side portions 44 and 44 are sequentially surrounded by the periphery of 41.

  In the airbag 19A of the second embodiment, as shown in FIG. 14 and FIG. Since the tether 32 does not pull the leading edge side portion 44 of the extended sheet portion 43 of the pair of opposed sheet portions 39, in other words, the folded portion of each opposed sheet portion 39 is folded. The heavy portions 50 are respectively disposed on the back surface 41c side opposite to the exhaust port 27 side in the opposed edge portion 41, and the opposed edge portions 41 can be separated from each other. The air is exhausted to the outside of the bag portion 20 through the space between the opposed edge portions 41 and 41 of the pair of separated opposed sheet portions 39.

  Thereafter, the bag part 20 is expanded by increasing the internal pressure by the inflating gas G, and then the tether 32 is in a stretched state. As shown in FIGS. 16A, 16B, and 16C, the edge side portion 44 is pulled back so as to be reversed from the back surface 41c side opposite to the exhaust port 27 to the exhaust port 27 side. The leading edge side portion 44 and the original side portion 48 are to enter. At that time, under the pressure of the expansion gas G, the pair of opposing sheet portions 39 inflates areas extending from the respective opposing edge portions 41 to the extending sheet portion 43, and from the opposing edge portions 41 in the extending sheet portion 43. The outer surfaces 48c, which are the surface sides of the folded original side portion 48, are pressed against each other, and the expansion gas G is retained in an area extending from each opposing edge portion 41 to the original side portion 48 of the extending sheet portion 43. Exhaust of the expansion gas G from the exhaust port 27 is suppressed. At this time, the pair of opposing sheet portions 39 are connected to each other on the upper and lower edges 28c, 28d of the exhaust port 27, and the extension sheet portion 43 is folded between the opposing edge portions 41, 41. The reversal portion 46 is provided between the folded portion 50 and the original side portion 48 that is folded back from the opposing edge portion 41, and the leading edge side that is folded back so as to contact the opposing edge portion 41. The opposite edge 41 and the folded portion 50 of the extended sheet 43 are overlapped so that the portion 44 is disposed, and both edges 41a and 44a in the direction orthogonal to the opposite direction of the opposite edges 41 and 41 are provided. , 48a side (see FIG. 13C and FIG. 17B). Therefore, it also expands between the original side portion 48 of the folded portion 50 in which the outer side surfaces 48c as the surface side are pressed against each other and the leading edge side portion 44 that extends from the original side portion 48 and is reversed by the reversing portion 46. Even if the working gas G enters and the leading edge side portion 44 is pulled by the tether 32 as shown in FIGS. 16B and 16C, the inner side 48b and 44b of the leading edge side portion 44 are moved from the original side portion 48 to the inner peripheral side 48b. The leading edge side portion 44 is inverted from the original side portion 48 at the site of the inversion portion 46 so as to return to the coupled state by the acting pressure. As shown in FIG. 13C, the cross-sectional structure in the vicinity of the original side portion 48 that is in pressure contact with each other has a cylindrical shape wrapped around the opposing edge portions 41, 41 of the pair of opposing sheet portions 39, 39. The exhaust port 27 is closed by the portion 48d of the original side portion 48 of the planar extending sheet portion 43 that is in pressure contact with each other and the joint portion of both edges 48a in the width direction. As compared with the case where the conventional tubular parts are gathered to the center side and the exhaust port is closed, wrinkles are less likely to occur and the gap can be reduced, so that leakage of the expansion gas G can be stably suppressed.

  Further, in this configuration, the leading edge side portion 44 reversed by the reversing portion 46 is provided on the outer peripheral side (opposing edge portion 41 side) of the portion 48d of the original side portion 48 of the planar extending sheet portion 43 pressed against each other. Even when the tether 32 is loosened, it is difficult to return so that the inverted leading edge side portion 44 enters between the pressure-contacted original side portions 48 and 48 even if the tether 32 is loosened. Does not cause leakage.

  That is, in the internal pressure adjusting mechanism 30A of the second embodiment as described above, even if the tether 32 is loosened, it is difficult to exhaust the inflation gas G from the exhaust port 27 if the internal pressure is generated in the bag portion 20. A stable exhaust suppression mode RM can be secured.

  In the first and second embodiments, the attachment base portion 32a side of the tether 32 is attached to the peripheral wall 21 (lower wall portion 21c) side in the vicinity of the rear wall portion 21a on the side protruding from the bag portion 20 during expansion. If the tether 32 is operated so that the exhaust mode EM can be shifted to the exhaust suppression mode RM, the attachment base portion 32a side is coupled to the attachment seat 22 side having the inflow opening 23 of the bag portion 20, etc. It can be changed as appropriate.

  Moreover, in each embodiment, although the two exhaust ports 27 were provided in the bag part 20, and the pair of opposing sheet | seat parts 34 and 39 couple | bonded with the tether 32 were each provided in those exhaust ports 27, it demonstrated. Alternatively, a single exhaust port 27 may be formed in the bag unit 20, and a pair of opposing sheet units 34 and 39 coupled to the tether 32 may be provided in the single exhaust port 27. Of course, conversely, three or more exhaust ports 27 are formed in the bag portion 20, and at least one of the exhaust ports 27 is provided with a pair of opposed sheet portions 34 and 39 coupled to the tether 32. Also good.

  Furthermore, in each embodiment, a pair of opposing sheet portions 34 and 39 are formed from the opposing sheet members 63 and 66, and the opposing sheet members 63 and 66 are formed with respect to the peripheral edge 28 of the exhaust port 27 in the peripheral wall 21 of the bag portion 20. 66 is attached, and the pair of opposed sheet portions 34 and 39 are disposed on the peripheral edge 28 of the exhaust port 27. However, at least one of the pair of opposed sheet portions 34 and 39 is formed from the peripheral wall 21 itself. May be. For example, in the case where the peripheral edge 28 of the exhaust port 27 of the peripheral wall 21 is formed of separate bag base fabrics on the front edge 28a side and the rear edge 28b side of the exhaust port 27, the opposing sheet portions 34, 39 are What is necessary is just to extend and extend from a part of those base fabrics for bags.

  Further, in each embodiment, the airbag device for the passenger's seat is configured to quickly inflate the occupant PP with the proper arrangement and exhaust the inflation gas G so as not to be inflated with respect to the close occupant IP. The configuration in which the internal pressure adjusting mechanisms 30 and 30A are arranged in the airbags 19 and 19A of M is illustrated as an example. However, an exhaust port is provided in an airbag of another driver airbag device or an airbag of a knee protection airbag device. And the internal pressure adjusting mechanisms 30 and 30A of the present invention may be arranged.

  Furthermore, as a configuration in which the air outlet is provided with an inner bag and an outer bag that covers the inner bag as a configuration in which the exhaust port and the internal pressure adjusting mechanism are provided in the bag portion as in the present invention, Provide an exhaust port and an internal pressure adjustment mechanism for the inner bag as the bag part, or provide an exhaust port and an internal pressure adjustment mechanism for the outer bag at the site where the inflation gas flows from the inner bag to the outer bag. The present invention may be implemented. Of course, when the airbag is configured by connecting a plurality of bag portions so as to be partitioned by a partition wall having a communication port as an exhaust port, the communication port (exhaust port) of the predetermined bag portion is used. The present invention may be implemented by providing the internal pressure adjusting mechanism of the present invention together with the tether.

  Further, in the exhaust mode EM, openings (auxiliary exhaust ports) through which the expansion gas G can be exhausted are provided at the portions of the extended sheet portions 37 and 43 swelled in the exhaust suppression mode RM and the portions of the opposed edge portions 36 and 41. Thus, a predetermined amount of the expansion gas G which is smaller than that when the exhaust port 27 is fully opened may be exhausted.

  Furthermore, in each embodiment, the opposing sheet portion of the internal pressure adjustment mechanisms 30 and 30A is previously in the exhaust mode EM state when folded so that the exhaust mode EM can be smoothly set in the initial stage of inflation of the airbags 19 and 19A. 34 and 39 and the tether 32 are arranged, but the extension sheet portion 37 and the folding portion 50 of the extension sheet portion 43 shorten the length dimensions L2, L3, L4, and L5, and the exhaust suppression mode RM. When moving from the exhaust mode EM to the exhaust mode EM, the tether 32 is loosened and inverted between the opposed edges 36 and 41, and the opposed edges 36 and 41 are easily separated from each other. If the air bag 19 and 19A can be opened, the tether 32 is stretched at the beginning of the inflation, and the exhaust suppression mode RM is set. Then, the tension acting on the tether 32 or the mechanical release state for mechanically releasing the mounting state. Using like, and the mounting base 32a side of the tether 32 is broken or released, it may be configured to transition to an exhaust mode EM.

  Moreover, in each embodiment, although the case where the two tethers 32 were integrally coupled to the peripheral wall 21 on the attachment base portion 32a side was illustrated, as shown by the two-dot chain line in FIG. 5B or FIG. 14B, A coupling portion 32c coupled to each other may be provided on the distal end 32b side, and may be integrally attached to the peripheral wall 21 or the like on the attachment base portion 32a side.

19, 19A ... airbag, 20 ... bag portion, 20a ... outer peripheral surface, 21 ... peripheral wall, 27 ... exhaust port, 28 ... peripheral edge, 30, 30A ... internal pressure adjustment mechanism, 32 (F, B) ... tether, 32a ... installation Base part, 32b ... tip, 34 (F, B), 39 (F, B) ... opposing sheet part, 36, 41 ... opposing edge part, 36a, 41a ... side edge, 36b, 41b ... (tip) terminal, 36c, 41c ... back surface, 37 ... extended sheet portion, 37a ... side edge, 43 ... extended sheet portion, 44 ... leading edge side portion, 44a ... side edge, 44b ... (terminal) tip, 44c ... outer periphery, 44d ... inner side surface, 46 ... reversing part, 48 ... original side part, 48a ... side edge, 48b ... inner side surface, 48c ... outer side surface, 50 ... folding part,
G: Inflatable gas, LT: Length dimension (of tether), EM: Exhaust mode, RM: Exhaust suppression mode, M ... (for passenger seat) airbag device.

Claims (3)

A bag part that is formed from a flexible sheet material and is inflated by an inflowing inflation gas;
An exhaust port opened in the peripheral wall so as to exhaust the inflation gas from the bag portion;
An internal pressure adjusting mechanism formed of a flexible member and having a tether disposed in the bag portion with a distal end extending from the attachment base portion coupled to the vicinity of the peripheral edge of the exhaust port. When,
Configured with
The internal pressure adjusting mechanism is in an exhaust mode that facilitates exhaust of the expansion gas from the exhaust port when the tether is loosened, and the expansion gas from the exhaust port is extended when the tether is stretched An airbag configured to adjust to an exhaust suppression mode that suppresses exhaust of
The internal pressure adjusting mechanism is
A pair of opposing sheet portions formed from members having flexibility, arranged to extend from both edges facing each other at the periphery of the exhaust port on the outer peripheral surface side of the bag portion;
The two tethers,
With
The pair of opposing sheet portions are respectively
Opposing edges extending in a strip shape so as to face each other with the exhaust port in between from the periphery of the exhaust port;
An extended sheet portion that extends from the opposite edge portion and joins the tether to the tip side near the center in the width direction;
And configured with
The pair of opposing sheet portions are
The extending sheet portions are folded back and inserted between the opposing edge portions, and the opposing edge portions and the extending sheet portion are overlapped, and orthogonal to the opposing direction of the opposing edge portions. On both sides of the direction, connected and arranged with each other,
The tether having a tip coupled to each of the extending sheet portions,
In the loose state of the tether during the exhaust mode of the internal pressure adjustment mechanism, the extended sheet portions of the pair of opposed sheet portions are respectively disposed on the back side of the opposed edge portion opposite to the exhaust port side. And having a length dimension coupled to the extending sheet portion so that the opposing edges can be separated from each other,
In a state in which the tether is stretched during the exhaust pressure suppression mode of the internal pressure adjustment mechanism, while extending the area extending from the opposing edge portion of the pair of the opposing sheet portions to the extending sheet portion, the leading end sides of the extending sheet portions As a length dimension for pulling the extension sheet part, allowing the surface side of the extension sheet part to be folded back from the opposing edge part, and entering the space between the opposing wall parts.
An air bag characterized by being set.   The exhaust port is substantially formed by forming both edges provided with the opposed edge portions of the pair of opposed sheet portions at the periphery longer and linearly than both edges orthogonal to the opposed direction of the opposed edge portions. The airbag according to claim 1, wherein the airbag has a vertically long rectangular opening shape. The extended sheet portions of the pair of opposed sheet portions are respectively folded back from the end portion of the opposed edge portion to the exhaust port side of the opposed edge portion, and further inverted to the opposed edge portion side. It is possible to form a folded portion that is folded back,
Each folded portion is folded back so as to be in contact with the opposing edge by providing a reversing portion between the original side extending from the end of the opposing edge and the original side, and the tether A leading edge side portion to be joined, and
A pair of the opposing sheet portions are arranged such that the folded portion is disposed on the exhaust port side of each opposed edge portion, and the original side portions of the folded portion are overlapped with each other, and In a state where the opposing edge is overlapped with the folded portion, both edges in a direction orthogonal to the opposing direction of the opposing edge are mutually coupled.
The tether having a tip coupled to each of the leading edge sides,
In the relaxed state of the tether during the exhaust mode of the internal pressure adjustment mechanism, the folded portion of each of the opposed sheet portions is disposed on the back side of the opposed edge portion opposite to the exhaust port side. And it is set as the length dimension couple | bonded with the said leading edge side part so that the said opposing edge parts can be spaced apart,
In a state where the tether is stretched during the exhaust pressure suppression mode of the internal pressure adjustment mechanism, an area extending from the opposing edge portion to the original side portion of the pair of the opposing sheet portions is inflated, and the leading end sides of the extended sheet portions are made to extend. As a length dimension for allowing the leading edge side part to be brought into contact between the opposing wall parts and allowing the surface side of the original side part folded back from the opposing edge part of the opposing sheet part to be in pressure contact with each other,
The airbag according to claim 1 or 2, wherein the airbag is set.

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