JP6836171B2 - Airbag - Google Patents

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 the airbag by exhausting the inflowing expansion gas or suppressing the exhaust. Regarding airbags.

Conventionally, an airbag of an airbag device has been known to use a tether for an internal pressure adjusting mechanism (see, for example, Patent Documents 1 and 2). When the expanding airbag protrudes from the storage part, these internal pressure adjustment mechanisms exhaust the expansion gas from the exhaust port of the internal pressure adjustment mechanism if the occupant is close to the storage part, and the internal pressure of the airbag rises. To prevent the airbag from hitting an approaching occupant strongly, and to allow the airbag to complete expansion quickly if the occupant is in the proper position not too close. It suppressed the exhaust. The configuration of such an internal pressure adjusting mechanism is such that the peripheral edge of the exhaust port provided in the expanding bag portion is formed into a tube shape, and a tether having a predetermined length extending from the inside of the bag portion is coupled to the tubular portion. Was supposed to be.

In such an internal pressure adjustment mechanism, if the bag portion of the airbag expands while the occupant is close to the storage portion, the bag portion interferes with the occupant while the tether before the expansion of the bag portion is completed is loosened. The tether remains loose and maintains the tubular portion of the exhaust port open. Therefore, the expansion 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 occupant. On the other hand, if the occupant is located at an appropriate position where the occupants are not too close to each other, the bag portion of the airbag smoothly protrudes from the storage portion, and the tether is stretched. Therefore, the tubular portion on the periphery of the exhaust port is pulled by the tether to enter the bag portion, and further, the tubular portion is crushed and blocked by the internal pressure in the bag portion, so that the tubular portion expands from the exhaust port. The exhaust of the gas was suppressed, and the bag part was able to complete the expansion quickly.

Japanese Unexamined Patent Publication No. 2008-207579 U.S. Pat. No. 7,328,915

However, in the conventional airbag, in the exhaust suppression mode, the internal pressure inside the bag crushes the tubular tubular portion drawn into the bag to close the exhaust port, and the crushing is performed. Since the state is a state in which the peripheral walls of the tubular portion are collected on the central side, a state in which wrinkles are generated and collected on the central side cannot be avoided, and a state in which the expansion gas leaks from the gaps between the wrinkles cannot be prevented. In particular, if the opening area of the tubular portion is widened so that a stable exhaust mode can be maintained, the length of the peripheral wall of the tubular portion in the circumferential direction becomes longer, and in the exhaust suppression mode, the center of the tubular portion. Wrinkles that gather on the side increase and further promote gas leakage. Therefore, in the conventional airbag configuration, even if the mode shifts 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-mentioned problems, and an object of the present invention is to provide an airbag capable of ensuring a stable exhaust gas suppression state in the exhaust gas suppression mode.

The airbag according to the present invention includes a bag portion in which a peripheral wall is formed from a flexible sheet material and is expanded by an inflowing expansion gas.
An internal pressure adjusting mechanism composed of a closing member and a tether,
Is configured with
The internal pressure adjusting mechanism sets an exhaust mode that facilitates exhaust of the expansion gas from the exhaust port when the tether is loosened, and when the tether is stretched, the expansion gas from the exhaust port is set. a configuration airbag for adjusting the internal pressure and to suppress exhaust suppression mode the exhaust,
The internal pressure adjusting mechanism
There is flexibility in which an outlet that can communicate with the exhaust port is opened at the peripheral edge of the exhaust port on the inner peripheral surface side of the bag portion, and the tip of the tether is coupled to the peripheral edge of the exhaust port. sheet of the closure member, and is configured by disposing,
The closing member
A straight line connecting the binding site on the periphery of the outlet to which the tip of the tether is connected and the opening center of the outlet is used as a reference line, and the reference line is omitted on both sides in the width direction with the reference line as the center. Both parallel edge sides are coupled to the peripheral edge of the exhaust port and arranged in the bag portion, and at the same time.
A portion between the end edge of the tether on the binding site side and the outlet along the reference line is applied to the peripheral edge of the exhaust port as a lid forming portion capable of closing the exhaust port. as it will be configurable,
The length dimension of the portion for forming the lid between the end edge of the tether on the binding site side and the outlet along the reference line is determined by the exhaust on the edge side in the width direction from the binding site of the tether. It is arranged so that it is longer than the length dimension to the binding site to the peripheral edge of the mouth.
Dimension of the tether, when loose during the exhaust mode, the outlet and a length dimension capable of maintaining a state of being communicated with the exhaust port, and, when that stretched during the exhaust suppression mode, The binding site of the tether is set to have a pullable length so as to separate the peripheral edge of the outlet of the closing member from the inner peripheral surface of the bag portion.
Set,
The closing member
The reference is provided with a tack formed at a portion for forming the lid portion by providing a crease in a direction orthogonal to the reference line so as to lengthen a substantially length dimension along the reference line. Both sides in the direction orthogonal to the line are coupled to the peripheral edge of the exhaust port and arranged.
The internal pressure adjusting mechanism includes an auxiliary tether with a base side mounted on the mounting base side of the tether.
The auxiliary tether attaches the tack to the tip of the closing member from a separating side edge opposite to the edge of the closing member along the reference line, between the closing member and the exhaust port peripheral edge of the bag portion. is arranged coupled to the site of the site for lid formed provided,
The dimensions of the auxiliary tether can be pulled so as to shift the lid forming portion toward the exhaust port side at the time of transition from the exhaust mode to the exhaust suppression mode, and from the periphery of the exhaust port of the lid portion. As a length dimension that can suppress peeling of
The feature is that it is set.

In the airbag according to the present invention, if the expansion gas flows in while being folded and stored in a predetermined storage portion, the bag portion expands. At that time, if the tether remains loose in the exhaust mode state from the beginning of storage, the internal pressure adjustment mechanism does not pull the portion where the tip of the tether is connected, that is, the peripheral edge of the outlet of the closing member. Can be maintained. That is, the outlet of the closing member maintains the state of communication with the exhaust port, and the expansion gas is exhausted from the exhaust port to the outside of the bag portion through the outlet.

After that, the bag portion expands by increasing the internal pressure by the inflowing expansion gas, and then when the tether is in a stretched state, the tether is connected to the tip, that is, the binding site around the outlet of the closing member. , Pull. Then, the peripheral edge of the outlet of the closing member is separated from the inner peripheral surface of the bag portion, and the lid forming portion that is displaced from the exhaust port of the outer peripheral edge of the closing member is also separated from the peripheral wall of the bag portion, and The lid forming portion receives the internal pressure of the expansion gas, the lid is applied to the peripheral edge of the exhaust port, and the lid can close the exhaust port. In this closed state, the lid portion of the lid forming portion whose length dimension is longer than the length dimension in the width direction in the direction orthogonal to the reference line at the peripheral edge of the exhaust port of the closing member is used, and the lid portion is closed. It is pressed against the peripheral edge of the exhaust port to close the exhaust port, and even if the tether coupling portion on the peripheral edge of the outlet is pulled strongly by the tether, the lid forming portion itself pushes the lid from the peripheral edge of the exhaust port. If a sufficient length dimension is secured so as not to be peeled off, the lid portion will not be peeled off from the peripheral edge of the closed exhaust port, and the expansion gas will not leak from the exhaust port. Furthermore, even if the tether loosens after the lid closes the exhaust port, if internal pressure is generated in the bag, the lid will not separate from the periphery of the exhaust port and it will be difficult to exhaust the expansion gas, so it will be stable. The exhaust suppression mode can be secured.

Therefore, in the airbag according to the present invention, a stable exhaust suppression state can be ensured in the exhaust suppression mode. Further, the internal pressure adjusting mechanism is composed of a closing member and a tether having flexibility together, and can be easily folded together with the bag portion, and does not hinder the folding and storability of the airbag.

Then, in the airbag according to the present invention, the closing member is
The reference is provided with a tack formed at a portion for forming the lid portion by providing a crease in a direction orthogonal to the reference line so as to lengthen a substantially length dimension along the reference line. It is desirable that both sides in the direction orthogonal to the line are coupled to the peripheral edge of the exhaust port and arranged.

In such a configuration, the arrangement dimension along the reference line in the lid forming portion can be substantially shortened by tacking, and conversely, the arrangement dimension of the lid forming portion can be shortened. The actual length dimension along the reference line can be lengthened. Therefore, in such a configuration, when the lid closes the exhaust port in the exhaust suppression mode, the lid is applied to the peripheral edge of the exhaust port due to the margin of the length dimension due to the tack, and the exhaust port is further closed. It can be fitted into the exhaust port from the inner peripheral surface side of the bag part so as to protrude toward the outer peripheral surface side of the bag part, and the exhaust port can be closed like a plug with the lid part, in the exhaust suppression mode. Leakage of expansion gas from the exhaust port of the above can be prevented more stably.

Further, in the airbag according to the present invention, the internal pressure adjusting mechanism includes an auxiliary tether in which the base side is attached to the attachment base side of the tether.
The auxiliary tether
The lid forming portion provided with the tack from the separating side edge on the opposite side of the end edge of the closing member along the reference line, between the closing member and the exhaust port peripheral edge of the bag portion. While connecting the tip to the part of
A length that can be pulled so as to shift the lid forming portion toward the exhaust port side at the time of transition from the exhaust mode to the exhaust suppression mode, and can suppress peeling of the lid portion from the periphery of the exhaust port. As a dimension, as
It may be arranged.

In such a configuration, when shifting from the exhaust mode to the exhaust suppression mode, the auxiliary tether separates the tether (main tether) coupled to the peripheral edge of the outlet from the tack to the lid forming portion provided with the tack. Since the lid is pulled directly toward the exhaust port while extending the fold, the lid can be smoothly placed on the periphery of the exhaust port, and when shifting from the exhaust mode to the exhaust suppression mode, it is quick. It is possible to close the exhaust port. Of course, the auxiliary tether has a length dimension that can suppress peeling of the lid from the periphery of the exhaust port, and does not hinder the closure of the exhaust port by the lid.

Further, in the airbag according to the present invention, the closing member is
It is desirable that the end edge of the tether on the binding site side along the reference line is bonded to the peripheral wall of the bag portion.

In such a configuration, the edge along the reference line at the lid forming portion does not separate from the inner peripheral surface of the bag portion (does not rise) when the tether is stretched, so that the inner peripheral surface of the bag portion does not rise. The part for forming the lid can be shifted to the exhaust port side by suppressing the lifting from the side, and the internal pressure of the bag can be used to quickly attach the lid to the periphery of the exhaust port. When shifting from the exhaust mode to the exhaust suppression mode, the exhaust port can be closed quickly.

It is a schematic vertical sectional view of the vehicle-mounted state of the airbag device for a passenger seat in which the airbag of one embodiment according to the present invention is used. It is a schematic perspective view seen from the front side in the state where the airbag of an embodiment is inflated by itself, and also shows the partially enlarged perspective view of the periphery of the exhaust port in the exhaust mode. It is a schematic vertical sectional view along the front-rear direction of the airbag of FIG. 2 is a schematic front view and a schematic vertical cross-sectional view of the periphery of the exhaust port in the exhaust suppression mode of the airbag of FIG. 2 is a schematic front view and a schematic vertical cross-sectional view of the periphery of the exhaust port in the exhaust mode of the airbag of FIG. It is a figure explaining the expansion process at the time of operation of the airbag in an embodiment, and shows the state which the occupant is approaching. It is a figure explaining the expansion process at the time of operation of the airbag in an embodiment, and shows the state in which an occupant is positioned at an appropriate position. It is a schematic vertical sectional view explaining the state which shifts from the exhaust mode to the exhaust suppression mode of the internal pressure adjustment mechanism of embodiment in order. It is the schematic front view explaining the state which shifts from the exhaust mode to the exhaust suppression mode of the internal pressure adjustment mechanism of embodiment in order. It is a figure explaining the manufacturing process of the internal pressure adjusting mechanism of the airbag of an embodiment in order. It is a figure explaining the manufacturing process of the internal pressure adjusting mechanism of the airbag of an embodiment in order, and describes the process after FIG. It is the schematic front view explaining the operation state of the modification of the internal pressure adjustment mechanism of embodiment. It is a figure explaining the manufacturing process of another modification of the internal pressure adjustment mechanism of embodiment in order. It is a schematic front view explaining the operation state of the modification of the internal pressure adjustment mechanism shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, as shown in FIG. 1, the airbag 19 used in the passenger seat airbag device M will be described as an example. The passenger seat airbag device M is arranged in front of the passenger seat, and as shown in FIG. 1, is inside the upper surface 2 side of the instrument panel (hereinafter abbreviated as “instrument panel”) 1 below the windshield 4. It is said to be a top mount type to be mounted. The airbag device M includes a folded airbag 19, an inflator 8 that supplies an expansion gas to the airbag 19, a case 12 as a storage portion for storing and holding the airbag 19 and the inflator 8, an airbag 19 and an airbag 19. A retainer 9 for attaching the inflator 8 to the case 12 and an airbag cover 6 for covering the upper part of the folded airbag 19 are provided.

The airbag cover 6 is integrally formed with an 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 during expansion and expansion and open on both front and rear sides. .. Further, a connecting wall portion 6c connected to the case 12 is formed around the door portions 6a and 6b of 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 columnar main body portion 8a having a plurality of gas discharge ports 8b, and a flange portion 8c for attaching the inflator 8 to the case 12.

The case 12 as a storage portion is formed in a substantially rectangular parallelepiped shape made of sheet metal having a rectangular opening on the upper end side, and has a substantially rectangular plate-shaped bottom wall portion 12a to which the inflator 8 is inserted from below and attached, and a bottom wall. A peripheral wall portion 12b that extends upward from the outer peripheral edge of the portion 12a and locks the connecting wall portion 6c of the airbag cover 6 is provided. 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 to lock the connecting wall portion 6c is formed.

Then, in the case of the embodiment, the airbag 19 and the inflator 8 attach each bolt 9a of the retainer 9 arranged in the airbag 19 to the peripheral edge of the inflow opening 23 described later in the airbag 19 as an attachment means. It is attached to the bottom wall portion 12a of the case 12 by penetrating the seat 22, the bottom wall portion 12a of the case 12, and the flange portion 8c of the inflator 8 and fixing the nut 10. Further, a bracket (not shown) connected to the body side of the vehicle is arranged on the bottom wall portion 12a of the case 12.

As shown in the two-dot chain line of FIG. 1 and FIGS. 2 and 3, the air bag 19 expands by inflowing an expansion gas, and when the expansion is completed, the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1 are connected to each other. A substantially bag-shaped bag portion 20 that can be arranged so as to close the space, an exhaust port 27 opened in the peripheral wall 21 of the bag portion 20 so as to exhaust the expansion gas G from the bag portion 20, and expansion from the exhaust port 27. It is configured to include an internal pressure adjusting mechanism 30 for adjusting the presence or absence of exhaust gas G.

The bag portion 20 is provided with a peripheral wall 21 made of a sheet material such as a flexible polyamide woven cloth, and as shown in FIGS. 2 and 3, the expansion completed shape is arranged with the top portion on the front end side. It has a substantially quadrangular pyramid shape. When the expansion is completed, the peripheral wall 21 includes a rear wall portion 21a on the occupant side, an upper wall portion 21b extending forward from the top, bottom, left and right of the peripheral edge of the rear wall portion 21a, a lower wall portion 21c, a left wall portion 21d, and a right wall portion. It is configured to include 21e. An inflow opening 23 is formed in the lower wall portion 21c near the front end of the bag portion 20 in the left-right direction to open in a substantially circular shape so that the expansion gas can flow into the bag portion 20. The peripheral edge of the inflow opening 23 is a plurality of mounting seats 22 to be attached to the bottom wall portion 12a of the case 12 by inserting the bolts 9a of the retainer 9 and attaching the bolts 9a to the bottom wall portion 12a of the case 12 (in the case of the embodiment). 4, 4) mounting holes 24 are formed. In the case of the embodiment, the rear wall portion 21a is provided with a recess 21aa recessed in the front side in the center in the left-right direction so as to be along the vertical direction.

The exhaust port 27 is arranged on the front side of the left and right left wall portions 21d and the right wall portion 21e, and each is opened in a circular shape.

A vent hole 25 for exhausting the excess expansion gas G after the expansion of the bag portion 20 is completed is also separately 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 is configured to include a flexible tether 32 formed of a woven fabric of polyamide or the like, and a closing member 34. The internal pressure adjusting mechanism 30 is provided with exhaust ports 27 at two locations, a left wall portion 21d and a right wall portion 21e of the bag portion 20, and in the case of the embodiment, it corresponds to the two exhaust ports 27. It is arranged in two places.

The tether 32 has a tip 32b extending from the mounting base 32a coupled to a closing member 34 on the periphery of the exhaust port 27. In the case of the embodiment, two tethers 32 are arranged corresponding to the left and right exhaust ports 27, respectively, and the mounting base portion 32a is rearward near the center in the left-right direction of the lower wall portion 21c of the bag portion 20. It is joined to the portion near the wall portion 21a by sewing. The tip 32b of each tether 32 is sewn to a predetermined portion of the closing member 34 on the peripheral edge of the left and right exhaust ports 27, respectively.

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 the tether 32 is loosened, as shown in FIGS. 4 to 8. When 32 is stretched, the exhaust suppression mode RM is adjusted to suppress the exhaust of the expansion gas G from the exhaust port 27. Specifically, in the state where the tether 32 is stretched, the rear wall portion 21a of the bag portion 20 is arranged over the rear surface 3 of the instrument panel 1 and the mounting base portion 32a is arranged at the retracted position BP behind the rear surface 3. Yes (see B in FIG. 7), in that case, the internal pressure adjusting mechanism 30 is set to the exhaust suppression mode RM, and the tether 32 is in a loosened state when the mounting base 32a is on the front side of the retracted position BP, for example, near the rear surface 3. (See B in FIG. 6), and the internal pressure adjusting mechanism 30 is in the exhaust mode EM. If the mounting base portion 32a is located in front of the retracted position BP, the loosened state of the tether 32 is maintained even during the expansion of the bag portion 20, and the rear wall portion 21a is as shown in FIGS. In the case of hitting the proximity occupant IP, the tether 32 is maintained in a loose state without being stretched.

The tether 32 is configured as a main tether in which the tip 32b is coupled to the front edge 41a side of the peripheral edge 41 of the outlet 40 described later of the closing member 34 of the internal pressure adjusting mechanism 30, and the internal pressure adjusting mechanism 30 of the embodiment has the tether 32. In addition to the main tether 32, two auxiliary tethers 64 are also arranged inside the bag portion 20. In each auxiliary tether 64, the base portion 64a side is coupled to the mounting base portion 32a side of the main tether 32, and the tip end 64b is coupled to the mountain fold portion 58 described later of the closing member 34.

Further, these tethers 32 and 64 have width dimensions smaller than the width direction of the portions connecting the tips 32b and 64b (periphery 41 of the outlet 40 and the mountain fold portion 58), and these portions (periphery of the outlet 40). It is connected to the center in the width direction of 41 and the mountain fold portion 58).

As shown in FIGS. 4 and 5, the closing member 34 of the internal pressure adjusting mechanism 30 opens an outlet 40 capable of communicating with the exhaust port 27 on the peripheral edge of the exhaust port 27 on the inner peripheral surface 20b side of the bag portion 20. It has a substantially rectangular sheet shape. The outlet 40 has a circular opening having the same diameter as the exhaust port 27. The tip 32b of the tether 32 is connected to the front edge 41a of the peripheral edge 41 of the outlet 40.

In the closing member 34, the straight line connecting the binding site 42 of the peripheral edge 41 of the outlet 40 to which the tip 32b of the tether 32 is connected and the opening center C1 of the outlet 40 is set as the reference line LB, and the reference line LB is substantially the center. Both edges 37 and 38 substantially parallel to the reference line on both sides in the width direction (along the vertical direction) are coupled to the peripheral edge 28 of the exhaust port 27 and arranged in the bag portion 20. In the case of the embodiment, the reference line LB is arranged along the front-rear direction, and its orthogonal direction VD is the width direction. Further, both edges 37 and 38 coupled to the bag portion 20 are provided so that the peripheral edge 41 of the outlet 40 is attached to the peripheral edge 28 of the exhaust port 27 and the outlet 40 is aligned with the exhaust port 27. It is longer than the diameter of 40 in the front-rear direction and is coupled to the exhaust port peripheral edge 28 (see FIG. 11).

Then, the closing member 34 abuts a portion between the end edge (front edge) 36 and the outflow port 40 on the binding site 42 side of the tether 32 along the reference line LB against the peripheral edge 28 of the exhaust port 27. 27 is a lid forming portion 46 that can be configured as a lid 50 that can be closed. That is, as shown in FIGS. 4, 5, 10 and 11, the closing member 34 has an outlet side portion 45 in which the outlet 40 is arranged and an outlet side portion 45 when viewed from the inner peripheral surface 20b side of the bag portion 20. A lid forming portion 46 on the front side of the side portion 45 is arranged side by side in the front-rear direction.

Further, the closing member 34 has a substantially length dimension of the portion 46 for forming the lid portion between the end edge (front edge) 36 and the outlet 40 on the binding site 42 side of the tether 32 along the reference line LB. The LH is set longer than the length dimension LV from the binding site 42 of the tether 32 to the binding sites 76 and 77 to the peripheral edge 28 of the exhaust port 27 on the width direction edges 37 and 38 (A in FIG. 10). , C).

Further, the closing member 34 of the embodiment is orthogonal to the reference line LB (width direction of the closing member 34) so that the lid forming portion 46 can secure a substantially length dimension LH along the reference line LB. With the folds 54, 55, 56, 57 provided and the folded tack 52 provided, both sides 37, 38 of the reference line LB and the orthogonal direction VD are exhausted by the bag side coupling portions 76, 77. It is arranged so as to be coupled to the peripheral edge 28 of the mouth 27. Therefore, when the lid forming portion 46 of the embodiment is unfolded flat, as shown in A of FIG. 10, the main body portion 47 near the front edge 41a of the outlet 40 for providing the tack 52 and the end edge thereof. It is configured to include an edge side portion 48 on the 36 side. The main body portion 47 has a narrower width than the edge side portion 48 and the outlet side portion 45, and the upper and lower edges 72a, 72b, except for the vicinity of the portion connected to the edge side portion 48 and the outlet side portion 45, The 72c and 72d are set so as not to be sewn to the peripheral wall 21 of the bag portion 20, that is, to fit between the binding sites 76 and 77.

The tack 52 has a crease 57 at the center of the main body 47 in the direction (front-back direction) along the reference line LB, and ends on the trailing edge (separated side edge rearward from the edge 36) 35 side. The main body 47 is folded so as to overlap the edge (front edge) 36 side, and folds 55 and 56 are made on the folded portion, and the portion of the fold 57 is on the side of the outlet side portion 45. It is formed by folding it so as to approach the outlet 40 side with a crease 54 and then separating the edge side portion 48 from the peripheral edge 41 side of the outlet 40 (see A and B in FIG. 10). ).

When the main body 47 is folded in half at the fold 57 when the tack 52 is formed, the upper and lower overlapping edges, that is, the upper front edge 72a and the upper trailing edge 72b, and the lower front edge 72c and the lower trailing edge The 72d mutual is sutured by the suture thread 80.

Further, if the upper and lower edges 37 and 38 of the closing member 34 are connected to the peripheral edge 28 of the exhaust port 27 in the state where the tack 52 is provided, the portion of the fold 57 of the tack 52 is the outlet 40 of the closing member 34. The peripheral portion of the bag, that is, the portion 41b on the front edge 41a side and the peripheral edge 28 of the exhaust port 27 of the bag portion 20 (see B in FIG. 11), and further, from the fold 57, the reference line. The edge 36 side along the LB, that is, the mountain fold portion 58 extending forward (continuing) to the peripheral edge portion 41b side and the edge 36 side of the outlet 40 (see FIGS. 9 and 10). .. The main body 47 constitutes four overlapping portions 47a, 47b, 47c (peripheral portion 41b), 47d by the folds 54, 55, 56, 57 of the tack 52, and bends in the exhaust suppression mode RM to exhaust. A lid portion 50 that closes the mouth 27 will be formed.

The tack 52 is arranged in the area on the edge 36 side, that is, on the front side of the outlet 40 so as not to narrow the opening area of the outlet 40 in the exhaust mode EM.

Then, in the case of the embodiment, the tip 64b of the auxiliary tether 64 is connected to the upper and lower sides of the mountain fold portion 58 (upper and lower sides with the outflow port 40 in between). The auxiliary tethers 64 and 64 are coupled to each other via the outlet side portion 45 of the peripheral edge 41 of the outlet 40 of the closing member 34 and the peripheral edge 28 of the exhaust port 27 of the bag portion 20.

Further, the closing member 34 connects the end edge 36 of the main tether 32 along the reference line LB on the binding site 42 side to the peripheral wall 21 of the bag portion 20 by the bag side coupling portion 78. The folds 55 and 56 of the tack 52 are arranged on the rear side of the bag side coupling portion 78 and are not coupled to the bag portion 20 side.

As described above, the closing member 34 is formed of a substantially rectangular sheet-shaped base cloth 70 for the closing member, which is formed of a flexible polyamide woven cloth or the like, as shown in FIG. 10A. Has been done. Further, as described above, the closing member 34 is composed of the outlet side portion 45 and the lid portion forming portion 46, and the lid portion forming portion 46 is composed of the main body portion 47 and the end edge side portion 48. ing. Then, the base cloth 70 for the closing member includes a mouth side portion 71 constituting the outlet side portion 45 having the outlet 40 opened, a lid side portion 72 forming the main body portion 47 of the lid portion forming portion 46, and the lid side portion 72. It is composed of an end side portion 74 constituting an end edge side portion 48 of the lid portion forming portion 46. The lid side portion 72 constituting the main body portion 47 has a mouth side portion 71 constituting the outlet side portion 45 and an end side portion 74 constituting the end edge side portion 48 so that a tack 52 not connected to the bag portion 20 can be formed. Therefore, the width dimension is made smaller.

In the step of forming the closing member 34 from the closing member base cloth 70, first, as described above, the tack 52 is formed. That is, a crease 57 is provided at the center of the main body 47 in the direction (front-back direction) along the reference line LB, and the end edge (front edge) 36 side is overlapped with the separation side edge (rear edge) 35 side. The main body 47 is folded and the upper front edge 72a and the upper trailing edge 72b are sewn together, and the lower front edge 72c and the lower trailing edge 72d are sutured with the suture thread 80. Then, the folded main body portion 47 is provided with folds 55 and 56 so that the portion of the fold 57 is brought closer to the outlet 40 side, and then the fold 54 is attached and the end edge side portion 48 is provided with the outlet 40. If it is folded so as to be separated from the peripheral edge 41 side of the above, the pre-bonding member 82 can be formed as shown in B of FIG.

After that, as shown in B and C of FIG. 10, the pre-coupling member 82 is arranged so as to coincide with the exhaust port 27 on the inner peripheral surface 20b side of the bag portion 20, and the closing member base. The upper and lower edges 71a, 71b, 74a, 74b of the mouth side portion 71 and the end side portion 74 of the cloth 70 and the front edge 74c of the end side portion 74 are connected to the bag portion 20 by the suture thread 80 to form a bag. If the side coupling portions 76, 77, 78 are provided, the closing member 34 in which the upper and lower edges 37, 38 and the front edge 36 are coupled to the inner peripheral surface 20b side of the bag portion 20 around the exhaust port 27 is provided. It can be arranged.

After that, as shown in A, B, and C of FIG. 11, the tip 32b of the main tether 32 is coupled to the front edge 41a of the outlet 40, and the tip 64b of the auxiliary tethers 64 and 64 is connected to the outlet side portion 45. The internal pressure adjusting mechanism 30 can be formed by connecting the bag portion 20 to the peripheral wall 21 at a position shifted vertically from the outlet 40 of the mountain fold portion 58 to manufacture the airbag 19. can do.

In the main tether 32 and the auxiliary tether 64, for example, the mounting base portion 32a of the main tether 32 to which the base portion 64a is connected is connected in advance to a predetermined position of the peripheral wall 21, and the closing member 34 is connected to the peripheral wall 21. The tips 32b and 64b may be connected to the front edge 41a of the outlet 40 and the mountain fold portion 58 as described above. Further, before disposing the tethers 32 and 64, the bag portion 20 is formed with an inflow opening 23 and a mounting seat 22 in advance.

The arranged main tether 32 is in a state where the main tether 32 is stretched in the exhaust suppression mode RM of the internal pressure adjusting mechanism 30 (see FIG. 4), and the peripheral edge 41 of the outlet 40 of the closing member 34 is the inner circumference of the bag portion 20. The binding site 42 of the tether 32 has a pullable length dimension LM (see FIG. 7) so as to be separated from the surface 20b. Specifically, the length dimension LM is set so that the upper and lower edges 37 and 38 of the closing member 34 pull the peripheral wall 21. Further, the main tether 32 has a length dimension LM capable of maintaining a state in which the main tether 32 is loosened in the exhaust mode EM of the internal pressure adjusting mechanism 30 (see FIG. 5) and the outlet 40 is communicated with the exhaust port 27. It is said.

In the auxiliary tether 64, in the loosened state of the auxiliary tether 64 in the exhaust mode EM of the internal pressure adjusting mechanism 30 (see FIG. 5), the mountain fold portion 58 is arranged in front of the outlet 40 to form the region of the outlet 40. With the auxiliary tether 64 in the exhaust suppression mode RM of the internal pressure adjusting mechanism 30 stretched (see FIGS. 4 and 9), the mountain fold portion 58 is set to the separation side edge of the closing member 34 (see FIGS. 4 and 9). The length dimension LS is such that the lid portion forming portion 46 is pulled rearward along the reference line LB so as to be arranged near the trailing edge) 35, that is, so as to shift the lid portion forming portion 46 toward the exhaust port 27 side. Further, in this length dimension LS, even if the auxiliary tether 64 shifts to the exhaust suppression mode RM and the lid forming portion 46 is pulled to the rear side, the lid 50 in a state where the exhaust port 27 is closed is exhausted. It is set as a length dimension LS that does not peel off from the peripheral edge 28.

After the internal pressure adjusting mechanism 30 is attached to the bag portion 20 to manufacture the airbag 19, the retainer 9 is first made to project each bolt 9a from the attachment hole 24 so that the airbag 19 can be mounted on the vehicle as the airbag device M. Is stored in the bag portion 20, and the bag portion 20 of the airbag 19 is folded together with the tethers 32 and 64. Then, the airbag 19 is wrapped with a wrapping material (not shown) for preventing the airbag from collapsing 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 and in FIG. That is, the tethers 32 and 64 are loosened, the outlet 40 is overlapped with the exhaust port 27, and the airbag 19 is folded in that state.

Then, after the folded airbag 19 is wrapped with the wrapping material, each bolt 9a is projected from the bottom wall portion 12a of the case 12, and the folded airbag 19 is housed in the case 12 to accommodate the inflator 8. While inserting the main body 8a into the case 12 from below the bottom wall 12a of the case 12, each bolt 9a protruding from the bottom wall 12a is inserted into the flange 8c of the inflator 8 to insert the flange of the inflator 8 into the flange 8c. If the nut 10 is fastened to each bolt 9a protruding from the portion 8c, the airbag 19 can be attached to the case 12 together with the inflator 8. Then, the locking claw 12c is inserted into the locking hole 6d with respect to the connecting wall portion 6c of the airbag cover 6 in the instrument panel 1 mounted on the vehicle to lock the peripheral wall portion 12b of the case 12, and the case 12 The airbag device M can be mounted on the vehicle by fixing a predetermined bracket (not shown) to the body side of the vehicle.

After the airbag device M is mounted on the vehicle, if the expansion gas is discharged from each gas discharge port 8b of the inflator 8 at the time of a vehicle collision, the airbag 19 expands by inflowing the expansion gas into the inside. From the case 12, the wrapping material (not shown) is broken, the door portions 6a, 6b of the airbag cover 6 are pushed open, and the door portions 6a, 6b of the airbag cover 6 are pushed open to form an opening. As it protrudes upward, it expands and expands while protruding toward the rear side of the vehicle so as to close the space between the upper surface 2 of the instrument panel 1 and the windshield 4 above the instrument panel 1 as shown by the alternate long and short dash line in FIG. , The expansion will be completed.

At that time, as shown in A and B of FIG. 6, in the internal pressure adjusting mechanism 30, the rear wall portion 21a of the bag portion 20 interferes with the proximity occupant IP, and the tether 32 retracts the mounting base portion 32a to the retracted position BP (FIG. The state of the exhaust mode EM can be maintained if the vehicle is in a state of waiting in front of the vehicle without reaching (see B of 7) and is loose. That is, in the exhaust mode EM, as shown in FIG. 5, the tether 32 remains loose and the tip 32b of the tether 32 is joined, that is, the front edge of the peripheral edge 41 of the outlet 40 of the closing member 34. Since the binding site 42 on the 41a side is not pulled, the state of the exhaust mode EM can be maintained. Therefore, the outlet 40 of the closing member 34 maintains the state of communication with the exhaust port 27, and the expansion gas G is exhausted from the exhaust port 27 to the outside of the bag portion 20 via the outlet 40.

Therefore, even if the airbag 19 interferes (contacts) with the proximity occupant IP at the time of initial expansion, the airbag 19 continues to exhaust the expansion gas G from the exhaust port 27 without being strongly pressed to reach the expansion complete shape. Without doing so, the operation of the airbag device M is completed.

Further, when the airbag device M is operated with the occupant PP at an appropriate position away from the instrument panel 1, the bag portion 20 has flowed into the airbag 19 as shown in A and B of FIG. When 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 A and B of FIG. 8, the tether 32 is connected to the tip 32b, that is, the tether 32 is closed. The binding site 42 of the peripheral edge 41 of the outlet 40 of the member 34 is pulled. Then, as shown in A and B of FIG. 8 and A and B of FIG. 9, the peripheral edge 41 of the outlet 40 of the closing member 34 is separated from the inner peripheral surface 20b of the bag portion 20, and the flow in the closing member 34 is separated. The lid forming portion 46 displaced from the exhaust port 27 of the outlet peripheral edge 41 is also separated from the peripheral wall 21 of the bag portion 20, and the lid forming portion 46 receives the internal pressure of the expansion gas G, and FIG. As shown in C and D of FIG. 9 and C of FIG. 9, the lid portion 50 is applied to the peripheral edge 28 of the exhaust port 27, and the lid portion 50 can close the exhaust port 27. In this closed state, the lid forming portion 46 in which the length dimension LH is excessively longer (LV <LH) than the length dimension LV in the width direction in the orthogonal direction of the reference line LB at the outlet peripheral edge 41 of the closing member 34. The lid portion 50 is used, and the lid portion 50 is pressed against the exhaust port peripheral edge 28 to close the exhaust port 27. Further, the tether coupling portion 42 of the outlet peripheral edge 41 is strongly pulled by the tether 32. However, if the lid portion forming portion 46 itself secures a sufficient length LH so that the lid portion 50 is not peeled off from the exhaust port peripheral edge 28, the lid portion 50 can be formed on the closed peripheral edge 28 of the exhaust port 27. It does not peel off from the exhaust port 27 and does not cause leakage of the expansion gas G from the exhaust port 27. Further, even if the tether 32 is loosened after the lid portion 50 closes the exhaust port 27, if the internal pressure is generated in the bag portion 20, the lid portion 50 does not separate from the peripheral edge 28 of the exhaust port 27, and the expansion gas G Since it is difficult to exhaust the exhaust gas, a stable exhaust suppression mode RM can be secured. Then, the airbag 19 can quickly complete the expansion, have good cushioning properties, and receive and protect the occupant PP.

Therefore, in the airbag 19 of the embodiment, the exhaust suppression mode RM of the bag portion 20 by the internal pressure adjusting mechanism 30 can be stably secured. Further, the internal pressure adjusting mechanism 30 is composed of a tether 32 and a closing member 34, both of which have flexibility, and can be easily folded together with the bag portion 20, so that the airbag 19 can be folded and stored. Does not inhibit.

Further, in the airbag 19 of the embodiment, the closing member 34 is folded in the direction orthogonal to the reference line LB so as to lengthen the substantially length dimension along the reference line LB at the portion 46 for forming the lid portion. With the tack 52 folded by providing the eyes 57, 55, 56, 54, both sides 37, 38 of the reference line LB and the orthogonal direction VD are coupled to the peripheral edge 28 of the exhaust port 27 and arranged. There is.

Therefore, in the embodiment, the arrangement dimension SL along the reference line LB at the portion 46 for forming the lid can be made shorter than the substantial length dimension LH by the tack 52, and conversely, the arrangement dimension SL can be made shorter than the substantial length dimension LH. The actual length dimension LH along the reference line LB of the lid forming portion 46 can be made longer than the dimension SL. Therefore, in such a configuration, when the lid portion 50 closes the exhaust port 27 in the exhaust suppression mode RM, the lid portion 50 is exhausted by the margin of the length dimension (for LH-SL) due to the tack 52. It is fitted into the exhaust port 27 from the inner peripheral surface 20b side of the bag portion 20 so as to hit the peripheral edge 28 of the mouth 27 and further project to the outer peripheral surface side of the bag portion 20 through the exhaust port 27, and the lid portion 50. The exhaust port 27 can be closed like a plug (see D in FIGS. 4 and 8), and the leakage of the expansion gas G from the exhaust port 27 in the exhaust suppression mode RM can be prevented more stably. ..

The tack 52 has a closed bag shape in which the edges 72a and 72b and the edges 72c and 72d are connected to each other, and the lid portion 50 that closes the exhaust port 27 has a bag shape (cap shape). Since it is closed in a state, it does not cause gas leakage.

Further, in the embodiment, the internal pressure adjusting mechanism 30 includes an auxiliary tether 64 in which the base portion 64a side is attached to the attachment base portion 32a side of the main tether 32. The auxiliary tether 64 is provided with a tack 52 from the separated side edge 35 on the opposite side of the end edge 36 along the reference line LB of the closing member 34, between the closing member 34 and the exhaust port peripheral edge 28 of the bag portion 20. The tip 64b is coupled to the portion (mountain fold portion) 58 of the lid portion forming portion 46. The auxiliary tether 64 can be pulled so as to shift the lid forming portion 46 toward the exhaust port 27 at the time of transition from the exhaust mode EM to the exhaust suppression mode RM, and from the exhaust port peripheral edge 28 of the lid 50. It is arranged as a length dimension LS, which can suppress peeling.

Therefore, in the embodiment, when shifting from the exhaust mode EM to the exhaust suppression mode RM, the auxiliary tether 64 is tacked separately from the main tether 32 coupled to the peripheral edge 41 of the outlet 40, as shown in FIGS. Since the lid forming portion 46 provided with the 52 is directly pulled so as to be displaced toward the exhaust port 27 while extending the folds (creases) 54, 55, 56 of the tack 52, the lid 50 is formed. It is possible to smoothly arrange the exhaust port 27 on the peripheral edge 28, and it is possible to quickly close the exhaust port 27 when shifting from the exhaust mode EM to the exhaust suppression mode RM. Of course, the auxiliary tether 64 has a length dimension LS that can suppress peeling of the lid portion 50 from the exhaust port peripheral edge 28, and does not hinder the closure of the exhaust port 27 by the lid portion 50.

At the time of transition from the exhaust mode EM to the exhaust suppression mode RM, the lid forming portion 46 is quickly arranged on the exhaust port peripheral edge 28 due to the flow of the expansion gas G and the internal pressure in the bag portion 20, and the lid portion. If the 50 can quickly close the exhaust port 27 (see A, B, C in FIG. 12), only the tether 32 is arranged as in the internal pressure adjusting mechanism 30A of the airbag 19A shown in FIG. The auxiliary tether 64 may be eliminated.

Further, in the embodiment, the closing member 34 connects the end edge 36 of the tether 32 along the reference line LB on the binding site 42 side to the peripheral wall 21 of the bag portion 20.

Therefore, in the embodiment, the edge 36 along the reference line LB at the lid forming portion 46 does not separate from the inner peripheral surface 20b of the bag portion 20 (does not rise) when the tether 32 is stretched. The lid forming portion 46 can be shifted to the exhaust port 27 side by suppressing the lifting of the portion 20 from the inner peripheral surface 20b side, and the internal pressure of the bag portion 20 is used to quickly move the lid portion 50 to the exhaust port. It can be attached to the peripheral edge of the exhaust port 27, and the exhaust port 27 can be quickly closed when shifting from the exhaust mode EM to the exhaust suppression mode RM.

Of course, when shifting from the exhaust mode EM to the exhaust suppression mode RM, if the exhaust port 27 can be smoothly closed, the internal pressure adjusting mechanism 30B of the airbag 19B shown in FIGS. 13 and 14 may be configured.

As shown in FIG. 13, the closing member 34B of the internal pressure adjusting mechanism 30 is used because the overlapping portions 47a and 47b are eliminated from the closing member base cloth 70 of the closing member 34 of the embodiment. The 70B shortens the length dimension LH along the reference line LB, and does not connect the front edge (end edge) 36B side to the bag portion 20. That is, although the lid portion forming portion 46B is configured to include the main body portion 47B and the end edge side portion 48, the main body portion 47B eliminates the overlapping portions 47a and 47b of the closing member base cloth 70, and the end edge side. The overlapping portion 47d connected to the portion 48 and the overlapping portion 47c connected to the outlet 40 are connected to each other so as to be inverted by providing a fold 60, and the overlapping portion 61 is provided and folded back. 47d is arranged on the back side (bag portion 20 side) of the end edge side portion 48 to form a structure. The binding sites to the bag portion 20 are limited to both the upper and lower edges 37 of the closing member 34B and the lower edges 38.

In the manufacture of the closing member 34B, as shown in FIGS. 13A and 13, a crease 60 is formed at the center of the main body portion 47 of the closing member base cloth 70B in the direction (front-back direction) along the reference line LB. Then, the main body 47B is folded so that the end edge (front edge) 36 side is overlapped with the separation side edge (rear edge) 35 side, and the overlapped upper edge 72a and lower edge 72c are sutured. Suture by 80. Then, if the crease 61 is formed and the edge side portion 48 is folded so as to be separated from the peripheral edge 41 side of the outlet 40, the pre-bonding member 82B can be formed as shown in B of FIG. After that, as shown in B and C of FIG. 13, the pre-coupling member 82B is arranged so as to coincide with the exhaust port 27 on the inner peripheral surface 20b side of the bag portion 20, and the closing member base. If the upper and lower edges 71a, 71b, 74a, 74b of the mouth side portion 71 and the end side portion 74 of the cloth 70B are connected to the bag portion 20 by the suture thread 80, and the bag side coupling portions 76, 77 are provided. If only the upper and lower edges 37 and 38 are connected to the inner peripheral surface 20b side of the bag portion 20 around the exhaust port 27, the closing member 34B can be formed and arranged in the bag portion 20. ..

Even in this closing member 34B, although the number of folds is small, the tack 52B by the two folds 60 and 61 connects the reference line (the tip 32b of the tether 32) from the arrangement dimension SL as in the closing member 34. A straight line connecting the binding site 42 of the peripheral edge 41 of the outlet 40 and the opening center C1 of the outlet 40) Substantial length dimension from the binding site 42 to the edge 36B at the lid forming site 46B along the LB. LH is lengthened.

Then, after the tether 32 is coupled to the binding site 42 of the closing member 34B to manufacture the airbag 19B, the tether 32 is folded and mounted on the vehicle as an airbag device M for the passenger seat as in the embodiment. use.

Even in this airbag 19B, in the exhaust mode EM in which the tether 32 is loose, the expansion gas G is exhausted from the exhaust port 27 through the outlet 40, and the exhaust mode EM is maintained as shown in A of FIG. After that, when the bag portion 20 expands by increasing the internal pressure by the inflowing expansion gas G and then the tether 32 is in a stretched state, the tether 32 pushes the tip 32b as shown in A and B of FIG. The binding site 42 of the coupled closing member 34B is pulled. Then, the peripheral edge 41 of the outlet 40 of the closing member 34B is separated from the inner peripheral surface 20b of the bag portion 20, and the lid forming portion 46B that is displaced from the exhaust port 27 of the outlet peripheral edge 41 of the closing member 34B is also formed. , Apart from the peripheral wall 21 of the bag portion 20, and the lid portion forming portion 46B receives the internal pressure of the expansion gas G, and as shown in B and C of FIG. 14, the bag-shaped (cap-shaped) lid portion 50 is applied to the peripheral edge 28 of the exhaust port 27, and the lid portion 50 can close the exhaust port 27. In this closed state, the lid portion is formed in which the length dimension LH is longer than the length dimension LV in the width direction in the orthogonal direction of the reference line LB at the outlet peripheral edge 41 of the closing member 34B (LV <LH: see FIG. 13). The lid portion 50 of the work portion 46B is used, and the lid portion 50 is pressed against the exhaust port peripheral edge 28 to close the exhaust port 27. Further, the tether coupling portion 42 of the outlet peripheral edge 41 is formed by the tether 32. If the lid forming portion 46B itself secures a sufficient length dimension LH from the connecting portion 42 to the edge 36B so that the lid 50 is not peeled off from the exhaust port peripheral edge 28 even if it is pulled strongly. Even if the edge 36B itself deviates significantly toward the exhaust port 27 as compared with the lid forming portion 46 of the embodiment, the lid 50 does not peel off from the peripheral edge 28 of the closed exhaust port 27 and is not peeled off from the exhaust port 27. Since the expansion gas G does not leak, the same actions and effects as those of the embodiment can be obtained.

In the embodiment, the mounting base portion 32a side of the tether 32 is mounted on the peripheral wall 21 (lower wall portion 21c) side in the vicinity of the rear wall portion 21a on the side protruding when expanded in the bag portion 20, but the outlet 40 is attached. If the tether 32 acts to pull the binding portion 42 of the peripheral edge 41, the mounting base portion 32a side is appropriately changed by coupling the bag portion 20 with the mounting seat 22 side having the inflow opening 23. be able to.

Further, in the embodiment, two exhaust ports 27 are provided in the bag portion 20, and the closing members 34 and 32B to be coupled to the tethers 32 and 64 are provided in the exhaust ports 27, respectively. One exhaust port 27 may be formed in the portion 20, and the closing members 34, 34B coupled to the tethers 32, 64 may be provided in the one exhaust port 27. Of course, conversely, even if 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 the closing members 34, 34B coupled to the tethers 32, 64. Good.

Further, in the embodiment, the passenger airbag device M so as to quickly complete the expansion for the properly arranged occupant PP and exhaust the expansion gas G so as not to expand the proximity occupant IP. Although the configuration in which the internal pressure adjusting mechanism 30 is arranged in the airbag 19 of the above is illustrated, an exhaust port is provided in the airbag of another airbag device for the driver's seat and the airbag of the airbag device for knee protection, and the present invention is used. The internal pressure adjusting mechanism 30 of the present invention may be configured to be arranged.

Further, as in the present invention, in the configuration in which the exhaust port and the internal pressure adjusting mechanism are provided in the bag portion, when the airbag has a double structure including an inner bag and an outer bag covering the inner bag, At the part where the expansion gas flows from the inner bag to the outer bag, an exhaust port and an internal pressure adjusting mechanism are provided for the inner bag as a bag part, and an exhaust port and an internal pressure adjusting mechanism are provided for the outer bag. , The present invention may be carried out. 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 a predetermined bag portion is used. , The present invention may be carried out by providing the internal pressure adjusting mechanism of the present invention together with the tether.

Further, an opening (auxiliary exhaust port) capable of exhausting the expansion gas G is provided at the portion of the lid portion 50 that closes the exhaust port 27 in the exhaust suppression mode RM to reduce the displacement compared to when the exhaust port 27 is fully opened. It may be configured to exhaust a predetermined amount of expansion gas G.

19, 19A, 19B ... Airbag, 20 ... Bag part, 20b ... Inner peripheral surface, 21 ... Peripheral wall, 27 ... Exhaust port, 28 ... Peripheral, 30, 30A, 30B ... Internal pressure adjustment mechanism, 32 ... (Main) tether, 32a ... Mounting base, 32b ... Tip, 34, 34A, 34B ... Closing member, 35 ... Separation side edge / trailing edge, 36, 36B ... Edge edge / front edge, 40 ... Outlet, 41 ... Peripheral, 41a ... Front edge , 42 ... (main tether) binding site, 50 ... lid, 52, 52B ... tack, 64 ... auxiliary tether, 64a ... base, 64b ... tip,
G ... Expansion gas, C1 ... (outlet) opening center, LB ... reference line, EM ... exhaust mode, RM ... exhaust suppression mode, M ... (for passenger seat) airbag device.

Claims (2)

A bag portion in which a peripheral wall is formed from a flexible sheet material and is expanded by an inflowing expansion gas,
An internal pressure adjusting mechanism composed of a closing member and a tether,
Is configured with
The internal pressure adjusting mechanism sets an exhaust mode that facilitates exhaust of the expansion gas from the exhaust port when the tether is loosened, and when the tether is stretched, the expansion gas from the exhaust port is set. a configuration airbag for adjusting the internal pressure and to suppress exhaust suppression mode the exhaust,
The internal pressure adjusting mechanism
There is flexibility in which an outlet that can communicate with the exhaust port is opened at the peripheral edge of the exhaust port on the inner peripheral surface side of the bag portion, and the tip of the tether is coupled to the peripheral edge of the exhaust port. sheet of the closure member, and is configured by disposing,
The closing member
A straight line connecting the binding site on the periphery of the outlet to which the tip of the tether is connected and the opening center of the outlet is used as a reference line, and the reference line is omitted on both sides in the width direction with the reference line as the center. Both parallel edge sides are coupled to the peripheral edge of the exhaust port and arranged in the bag portion, and at the same time.
A portion between the end edge of the tether on the binding site side and the outlet along the reference line is applied to the peripheral edge of the exhaust port as a lid forming portion capable of closing the exhaust port. as it will be configurable,
The length dimension of the portion for forming the lid between the end edge of the tether on the binding site side and the outlet along the reference line is determined by the exhaust on the edge side in the width direction from the binding site of the tether. It is arranged so that it is longer than the length dimension to the binding site to the peripheral edge of the mouth.
Dimension of the tether, when loose during the exhaust mode, the outlet and a length dimension capable of maintaining a state of being communicated with the exhaust port, and, when that stretched during the exhaust suppression mode, The binding site of the tether is set to have a pullable length so as to separate the peripheral edge of the outlet of the closing member from the inner peripheral surface of the bag portion.
Set,
The closing member
The reference is provided with a tack formed at a portion for forming the lid portion by providing a crease in a direction orthogonal to the reference line so as to lengthen a substantially length dimension along the reference line. Both sides in the direction orthogonal to the line are coupled to the peripheral edge of the exhaust port and arranged.
The internal pressure adjusting mechanism includes an auxiliary tether with a base side mounted on the mounting base side of the tether.
The auxiliary tether attaches the tack to the tip of the closing member from a separating side edge opposite to the edge of the closing member along the reference line, between the closing member and the exhaust port peripheral edge of the bag portion. is arranged coupled to the site of the site for lid formed provided,
The dimensions of the auxiliary tether can be pulled so as to shift the lid forming portion toward the exhaust port side at the time of transition from the exhaust mode to the exhaust suppression mode, and from the periphery of the exhaust port of the lid portion. As a length dimension that can suppress peeling of
An airbag that is characterized by being set. The closing member
The airbag according to claim 1, wherein the end edge of the tether on the binding site side along the reference line is coupled to the peripheral wall of the bag portion.

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