JP4971831B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device installed in a driver's seat or the like of a vehicle. Specifically, the airbag device can prevent a folded airbag body from collapsing, and can stably maintain the folded state. The present invention relates to a bag device.

  Currently, as a safety device for protecting an occupant when a vehicle such as an automobile collides, an airbag device is installed in a driver seat, a passenger seat, and the like. For example, an airbag device for a driver's seat is arranged on a steering wheel part, and when the vehicle collides and receives a large impact, the impact is detected and high pressure gas is generated from the inflator to generate the airbag body. By introducing the airbag body, the airbag body is inflated and deployed instantaneously forward of the occupant. As a result, the shock force applied to the human body by buffering and supporting the occupant with the airbag body can be greatly reduced, so that the safety of the occupant during a collision is ensured.

  In general, an airbag device is configured by fixing an airbag body and an inflator folded into a predetermined shape to a base member using a ring retainer, and further covering the airbag body with a synthetic resin module cover. Has been. More specifically, for example, as shown in FIG. 5, the airbag body 22 has a predetermined shape after first attaching a ring retainer 23 having a stud bolt 23 a to a peripheral portion of an opening serving as a gas inlet. The sub-assembly 21 of the airbag device is configured.

  Subsequently, the base member 25 is attached to the stud bolt 23a of the ring retainer 23, and the airbag main body 22 is sandwiched between the ring retainer 23 and the base member 25, whereby the subassembly 21 is supported and fixed to the base member 25. Is done. Further, in this case, in order to prevent the airbag body 22 from being collapsed in a compact shape, the belt-like wrapping sheet 24 is attached to the airbag assembly before or after the base member 25 is attached to the subassembly 21. 22 is wrapped so as to wrap. Thereafter, an inflator (not shown) is attached to the ring retainer 23, and an airbag device is assembled by covering the airbag body with a module cover (not shown).

  An example of such an airbag apparatus is disclosed in Japanese Patent Laid-Open No. 9-118187 (Patent Document 1). In this Patent Document 1, for the purpose of improving the assembly workability and storage performance of an airbag device, when the airbag device is assembled, a wrapping sheet is wrapped around the airbag body folded into a predetermined shape. Two methods for maintaining the folded state are described.

  First, as a first method, an engaging claw is provided on the opposite side surface portion of the base member, and an engaging hole portion that can be engaged with the engaging claw of the base member is formed in advance on both side ends of the wrapping sheet. Keep it. Then, the airbag body with the ring retainer is folded into a predetermined shape, the base member is attached to the airbag body, the airbag body is supported by the base member, and then the engagement member formed at one end of the wrapping sheet. The mating hole is hooked and locked on one engaging claw provided on the base member.

  Subsequently, the wrapping sheet is wound around the folded airbag body, and the engagement hole formed at the other end of the wrapping sheet is locked to the other engagement claw of the base member. As a result, the wrapping sheet is wound around the airbag body, and the folded state of the airbag body supported by the base member is maintained.

  On the other hand, as a second method, insertion hole portions for inserting the stud bolts of the ring retainer are formed in advance on both side end portions of the wrapping sheet, and the airbag body to which the ring retainer is attached is folded into a predetermined shape, Thereafter, the stud bolt of the ring retainer is inserted into the insertion hole formed at the one side end of the wrapping sheet, thereby locking the one side end of the wrapping sheet to the airbag body.

  Subsequently, the wrapping sheet is wrapped around the airbag body, and the insertion hole formed at the other end of the wrapping sheet is fastened to the stud bolt of the ring retainer and locked. Thereby, the folded state of the airbag body is maintained and the subassembly is assembled. Thereafter, the base member is attached to the stud bolt of the ring retainer, and the airbag body is supported and fixed to the base member.

According to Patent Document 1, when the wrapping sheet is wound around the airbag body, both end portions of the wrapping sheet are locked to the engaging claws provided on the base member as described above and the stud bolt of the ring retainer. By assembling the airbag device, the assembly work can be quickly performed without increasing the number of components.
JP-A-9-118187

  Generally, since the folded state of the airbag body affects the deployment behavior of the airbag body when the airbag device is activated, the airbag body is required to be regularly folded into a predetermined shape. On the other hand, since the airbag body has a restoring force, even if the airbag body is folded into a predetermined shape, if the folded state is not maintained by wrapping the wrapping sheet or the like, the airbag body expands and collapses. End up.

  Therefore, in order to hold the folded state of the airbag body, for example, when the wrapping sheet is wrapped around the airbag body using the first method as described above, the airbag body is folded into a predetermined shape. The base member is fixed to the airbag body while the folded airbag body is pressed from the upper surface side which is the deployment side of the airbag body to prevent the airbag body from collapsing, and further, a wrapping sheet is wound around the airbag body. Thus, it is necessary to perform assembly work.

  However, the assembly work while pressing such an airbag main body from the upper surface side becomes complicated, which places a heavy burden on the operator. Even if the assembling work is carefully performed, the folded state of the airbag body is likely to collapse between the time when the airbag body is folded and the time when the wrapping sheet is wound. Thus, if the airbag main body collapses before the wrapping sheet has been wound, the airbag main body must be folded again, resulting in poor work efficiency.

  On the other hand, when the wrapping sheet is wound around the airbag body using the second method described above, the wrapping sheet is wound around the airbag body immediately after the airbag body is folded into a predetermined shape. For this reason, the airbag body can be folded in a compact manner, and compared to the first method described above, the airbag body can be made less likely to collapse before the wrapping sheet is wound.

  However, as in the second method described above, when the both ends of the wrapping sheet wrapped around the airbag body are fixed to the stud bolts of the ring retainer to hold the folded state of the airbag body, the wrapping sheet is The bag body is tightened not only from the upper surface side but also from the side portion side.

  For this reason, for example, as shown in a side view of the state where the subassembly 21 is supported by the base member 25 in FIG. 6, the airbag body 22 is folded into a roll shape or a bellows shape, and at least on the upper surface side of the airbag body 22 When the two folded portions 22a are folded in a parallel state, even if the airbag body 22 is firmly folded, the two folded portions 22a are formed after the wrapping sheet 24 is wrapped around the airbag body 22. By tightening the wrapping sheet 24, it is easy to overlap vertically. If the folded portion 22a of the airbag body 22 overlaps in this manner, the airbag body 22 must be folded again regularly because it affects the deployment behavior of the airbag body during operation of the airbag device.

  The present invention has been made to solve such conventional problems, and a specific object thereof is that the airbag body is folded in a compact manner and is stably supported by the base member. An object of the present invention is to provide an airbag device that can prevent the roll-shaped or bellows-shaped folded portions arranged from overlapping each other and stably maintain the folded state of the airbag body.

To achieve the above object, an airbag apparatus provided by the present invention, as a basic configuration, hold is covered with a wrapping sheet from the upper to the airbag body folded into a predetermined shape, the airbag body An airbag device comprising: a subassembly assembled so as not to collapse a folded shape thereof; a base member that supports the subassembly; and an inflator that supplies inflation gas into the airbag body,
The wrapping sheet, the wrapping sheet opposite has a first engagement portion at least of the pair formed on the edge of the base member and the second engaging portion engageable respectively with said respective first engagement portion The most main feature is that the wrapping sheet is further tightened with respect to the base member by the engagement of the first engaging portions and the second engaging portions .

In the airbag device according to the present invention, the sub-assembly includes the airbag body, the wrapping sheet, and a holder having a stud bolt, and the holder inserted in the airbag body includes: With the stud bolt protruding outward from the airbag body, the stud bolt is attached to the airbag body,
Said base member, said attached to the stud bolt protruding from the airbag main body is preferably made of a lower surface side of the airbag body and sandwiched and fixed between the holder.

  Further, in the present invention, the first engagement portion of the wrapping sheet is a tab portion that is hooked and fixed to the base member, and the second engagement portion of the base member is a claw that locks the tab portion. Part.

In this case, the airbag body is folded in a roll or bellows consists of at least two folds are folded in parallel state to the upper surface side, the wrapping sheet has at least two of said pre-Symbol airbag body It is preferable that the folding portion has at least a pair of the tab portions to be tightened in a direction away from each other. Furthermore, it is preferable that the tab portion is formed by cutting the wrapping sheet.
In the present invention, the base member has a stepped portion bulging upward at least at a part of the outer edge portion on the upper surface side, and the stepped portion is formed as a guide for the subassembly to the upper surface of the base member. it is preferable that the Te.

Airbag apparatus according to the present invention, after folding the airbag body in a predetermined shape, prior to securing the base member, the air bag body is covered with a wrapping sheet having a first engagement portion from above the air bag body Holding and assembling the subassembly. Thereafter, the assembled sub-assembly is placed on the base member, the first engaging portion provided on the wrapping sheet is engaged with the second engaging portion provided on the base member, and the wrapping sheet is attached to the base member. After further tightening, the subassembly is fixed to the base member.

Thereby, the airbag main body can be folded compactly to reduce the size of the airbag device, and the airbag main body is not easily collapsed before being held by the wrapping sheet. Further, since the wrapping sheet that holds the airbag body from above is engaged with the second engaging portion of the base member, the sub-assembly can be stably supported on the base member. Therefore, before the airbag is activated, the folded airbag is not attached in a biased state, and when the airbag device is activated, the deployment behavior of the airbag body is stable, and the passenger protection performance of the airbag device Can be greatly improved.

In the airbag apparatus according to the present invention, since the wrapping sheet is further tightened with respect to the base member, the subassembly can be fixed to the base member in a more compact manner, and the subassembly is pressed in the vertical direction. Therefore, the folded airbag body can be reliably prevented from collapsing. Further, since the wrapping sheet is tensioned tightly in advance, the wrapping sheet is easily broken by introducing a slight amount of gas into the airbag body, and smooth airbag deployment can be performed.

In the airbag device of the present invention, the subassembly includes an airbag body, a wrapping sheet, and a holder having a stud bolt, and the stud bolt inserted into the airbag body has an airbag. The airbag body is mounted in a state of protruding outward from the body . Thereby, a subassembly can be fixed to a base member easily and reliably, and the assembly workability | operativity of an airbag apparatus can be improved.

  In the present invention, the sub-assembly can be easily fixed to the base member without using the holding tool having the stud bolt as described above. For example, the airbag body is provided with a tongue that extends from the opening edge of the airbag body and can be locked to the base member, and the wrapping sheet also has an opening edge side of the airbag body in addition to the first engagement portion. A tongue piece that extends from the base member and can be locked to the base member is provided. Thereby, after assembling the sub-assembly, the sub-assembly can be fixed to the base member by locking the tongues of the airbag body and the wrapping sheet to the base member, and even when the airbag device is activated. The airbag body and the wrapping sheet can be prevented from separating from the base member.

  Further, in the present invention, the wrapping sheet has a tab portion that is hooked and fixed to the base member as the first engaging portion, and the base member locks the tab portion of the wrapping sheet as the second engaging portion. It has a claw part to do. Accordingly, the first engaging portion of the wrapping sheet and the second engaging portion of the base member can be easily provided without increasing the number of parts and without increasing the manufacturing cost.

In the airbag device of the present invention, when the airbag body is folded in a roll shape or a bellows shape, and at least two roll-shaped or bellows-like folded portions are folded in parallel on the upper surface side, the wrapping sheet By the pair of tab portions, at least two folded portions of the airbag main body can be tightened in the direction of separating from each other .

As a result, the folded portion of the airbag body can be pulled in a direction in which the folded portion of the airbag body is separated from each other by the tab portion of the wrapping sheet that covers the airbag body from above. Even if the side is wrapped, tightening from the side surface side of the airbag body by the wrapping sheet can be eased. For this reason, for example, as shown in FIG. 6, the folded portions of the airbag body can be effectively prevented from overlapping each other, and the folded state of the airbag body can be stably maintained. As a result, when the airbag is activated, the airbag body can be stably inflated and deployed with a predetermined behavior.

  Furthermore, in the present invention, the tab portion of the wrapping sheet is formed by cutting the wrapping sheet. Accordingly, the tab portion can be easily formed using the cloth of the wrapping sheet without waste, and the tab portion can be easily hooked and locked to the base member when the sub-assembly is assembled.

Furthermore, the base member according to the present invention has a step portion in which at least a part of the outer edge portion on the upper surface side bulges upward. The step portion can guide the sub-assembly to the upper surface of the base member . When the sub-assembly is supported by the base member, the support of the sub-assembly by the base member is further stabilized, and the sub-assembly is more firmly positioned at a predetermined position of the base member. It can be fixed securely.

Hereinafter, preferred embodiments of an airbag device according to the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is an exploded perspective view schematically showing the airbag apparatus of the present embodiment, and FIG. 2 is a perspective view schematically showing the assembled airbag apparatus. is there.

  In the present embodiment, the upper direction is the direction on the side where the airbag body is supported with respect to the base member (in other words, the direction on the side where the airbag body is inflated and deployed), and the lower direction is The direction on the opposite side. The front-rear direction refers to a direction parallel to the boundary line between two folded portions formed on the upper surface side of the airbag body when the airbag device is assembled, and the left-right direction refers to a direction perpendicular to the boundary line. Point in direction.

  The airbag apparatus 1 of this embodiment is assembled when manufacturing the airbag apparatus equipped on the driver's seat side of the vehicle, and is attached to the folded airbag body 2 and the airbag body 2. A ring retainer 3; a wrapping sheet 4 wound around the airbag body 2; a base member 5 that supports the airbag body 2; and an inflator 19 that generates inflation gas and supplies the inflation gas into the airbag body 2. ing. Moreover, in this airbag apparatus 1, the subassembly 10 is comprised by folding the airbag main body 2 with which the ring retainer 3 was mounted | worn, and winding the wrapping sheet | seat 4 around the airbag main body 2 so that it may mention later. .

  In the present embodiment, the airbag main body 2 has a vertical relationship between a lower first folded portion 11 and two roll-shaped second folded portions 12 arranged in parallel on the left and right. So that it is folded regularly in a predetermined procedure. A circular opening into which the inflator 19 can be inserted and four small holes arranged around the opening are formed on the lower surface side of the airbag body 2. In the present invention, the folding procedure and the folding form of the airbag body 2 are not particularly limited, and can be appropriately changed according to, for example, the installation state of the airbag device.

  Further, the ring retainer 3 that functions as a holding tool is mounted on the peripheral edge of the opening on the inner surface side of the airbag body 2. The ring retainer 3 has an annular main body (not shown) and four stud bolts 3a suspended from the main body, and these stud bolts 3a are formed on the airbag main body 2. It is attached so as to be drawn out from the lower surface of the airbag body 2 through the small hole and protrude downward.

  The wrapping sheet 4 is wrapped so as to be wrapped in the airbag body 2 folded into a predetermined shape, and the airbag body 2 is held in a folded state. As shown in FIG. 3, the wrapping sheet 4 is formed symmetrically using a substantially rectangular sheet having elasticity, and is inserted for inserting a stud bolt 3a in the vicinity of the corner. A hole 6 is provided.

  A cutout 4 a cut out in an arc shape is provided at a portion sandwiched between the insertion holes 6 at the left and right side edges of the wrapping sheet 4. By providing such a notch 4a, when the wrapping sheet 4 is wound around the airbag body 2 and the left and right edges thereof are fixed to the stud bolts 3a, the lower surface side opening of the airbag body 2 is opened. It can be avoided that the left and right side edge portions of the wrapping sheet 4 overlap a part of the opening and block the opening.

  Further, the wrapping sheet 4 has tab portions 7 formed by making straight cuts from the end edge toward the center portion on the left and right side edge portions where the arc-shaped notches 4a are formed. is doing. The left and right tab portions 7 are formed with locking grooves 8 serving as first engaging portions that can be engaged by inserting claw portions 18 described later of the base member 5.

  Furthermore, in the wrapping sheet 4 of the present embodiment, slits 9 are formed from the center of the wrapping sheet 4 in the front-rear direction and the left-right direction. By providing such a slit 9, when the airbag apparatus is operated to inflate and deploy the airbag body 2, the wrapping sheet 4 is easily broken by the inflation pressure of the airbag body 2, and the airbag body 2 Can be stably expanded and deployed.

  The base member 5 has one inflator insertion hole 14 formed so as to penetrate in the vertical direction, and four stud bolt insertion holes 15 formed in the periphery thereof. In this case, the inflator insertion hole 14 is formed corresponding to the position and size of the opening formed in the airbag main body 2, and the stud bolt insertion hole 15 is arranged at the position of the stud bolt 3 a of the ring retainer 3. It is formed according to the size of the diameter.

  Further, on the upper surface side of the base member 5, a stepped portion 17 that bulges upward from the clamping surface 16 that clamps the airbag body 2 with the ring retainer 3 extends along the three outer edges of the base member 5. Arranged. In particular, in the stepped portion 17 in the present embodiment, the inner side surface 17a facing the inflator insertion hole 14 side of the stepped portion 17 is inclined so that the thickness (width) of each stepped portion 17 decreases upward. Is formed.

  By arranging the stepped portion 17 having such a shape on the base member 5, when the airbag main body 2 is supported on the upper surface of the base member 5, the position of the airbag main body 2 can be stabilized, It is possible to more effectively prevent the airbag body 2 from collapsing or collapsing. Furthermore, in this embodiment, the claw part 18 used as the 2nd engaging part which the tab part 7 of the wrapping sheet 4 is hooked and engages is provided in the lower part of the right and left both sides of the base member 5.

  The inflator 19 has a gas generation part 19 a that generates an expansion gas and four insertion holes 20 through which the stud bolts 3 a of the ring retainer 3 are inserted. The inflator 19 is attached to the lower surface side of the base member 5 in a state where the gas generating portion 19 a is inserted into the opening of the airbag body 2 through the inflator insertion hole 14 of the base member 5.

The airbag device 1 of the present embodiment configured using the airbag main body 2, the ring retainer 3, the wrapping sheet 4, the base member 5, and the inflator 19 as described above is assembled by the following procedure. .
First, the ring retainer 3 is attached to the opening peripheral edge of the inner surface of the airbag body 2 so that the stud bolt 3a protrudes from the lower surface of the airbag body 2, and the airbag body 2 is regularly arranged according to a predetermined procedure. Fold it up. At this time, in the present embodiment, as described above, the airbag body 2 is folded so that the two roll-shaped second folding portions 12 are arranged side by side on the upper surface side.

  After the airbag body 2 is folded into a predetermined shape, the wrapping sheet 4 is wrapped and tightened so as to wrap the airbag body 2 while holding the airbag body 2 from the upper surface side and holding the folded state. Configure. For example, one side edge of the wrapping sheet 4 is fixed to the two insertion holes 6 provided in one of the left and right side edges of the wrapping sheet 4 through the stud bolt 3a of the ring retainer 3, Two insertion holes provided on the other side edge portion of the airbag body 2 that is folded and wound so as to cover the upper surface of the airbag body 2 and then being stretched by pulling the wrapping sheet 4 6 is hooked on the remaining stud bolt 3a and fixed. Thereby, the wrapping sheet 4 is easily wound around the airbag body 2 to form the subassembly 10, and the folded shape of the airbag body 2 can be prevented from being broken.

  Thereafter, the subassembly 10 in which the airbag body 2 is wound up by the wrapping sheet 4 is fixed to the base member 5. Specifically, the stud bolt 3 a protruding from the lower surface of the airbag body 2 is inserted into the four stud bolt insertion holes 15 provided in the base member 5, and the ring retainer 3 and the clamping surface 16 of the base member 5 are The subassembly 10 is placed on the base member 5 so as to sandwich the airbag body 2 therebetween.

  At this time, since the stepped portion 17 is formed on the upper surface side of the base member 5 as described above, the airbag main body 2 can be securely placed at a predetermined position of the base member 5, and the air The support of the bag body 2 can be made more stable, and the airbag body 2 can be made less likely to collapse.

  After the subassembly 10 is placed on the base member 5, the tab portion 7 and the claw portion 18 are hooked on the left and right claw portions 18 of the base member 5 while extending the tab portion 7 of the wrapping sheet 4 in the left-right direction. Engage. As a result, the wrapping sheet 4 is tightened to the base member 5, and the subassembly 10 can be fixed to the base member 5. Further, after the inflator 19 is attached to the stud bolt 3a from the lower surface side of the base member 5, a nut is screwed into each stud bolt 3a, and the airbag body 2 is interposed between the body portion of the ring retainer 3 and the nut. The airbag apparatus 1 according to this embodiment as shown in FIG. 2 can be assembled by sandwiching and fixing the wrapping sheet 4, the base member 5, and the inflator 19. Further, the airbag device 1 assembled in this manner is provided with a module cover (not shown) for mounting on the driver's seat.

  Since the airbag apparatus 1 of the present embodiment assembled as described above is tightly wound the wrapping sheet 4 immediately after the airbag body 2 is folded, the airbag body 2 can be folded compactly, It is possible to effectively prevent the airbag body 2 from collapsing before the wrapping sheet 4 is wound. In addition, the airbag device 1 of the present embodiment attaches the base member 5 to the stud bolt 3a of the ring retainer 3 and clamps and fixes the airbag body 2 between the ring retainer 3 and the base member 5 and Since the tab portion 7 provided on the side edge portion is engaged with the base member 5, the fixing of the airbag main body 2 can be further stabilized.

  Further, the wrapping sheet 4 wraps the airbag body 2 and is pulled in the left-right direction by the tab portion 7. For this reason, tightening from the side surface portion of the airbag main body 2 by the wrapping sheet 4 is eased, and the second folded portion 12 arranged in parallel with the upper surface side of the airbag main body 2 is prevented from overlapping vertically. A regular folded state can be stably maintained over a long period of time.

  Therefore, it is possible to greatly reduce the number of times the folding operation of the airbag body 2 is folded and the folding work 12 is overlapped and the airbag device 1 is reassembled, thereby improving the efficiency of the assembly work. The burden on the operator can be reduced. Further, when the airbag is activated, the airbag body can be stably inflated and deployed with a predetermined behavior.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible as long as it has substantially the same configuration as the present invention and exhibits the same effects. is there. For example, the airbag device 1 shown as an embodiment is a sub-assembly of an airbag device installed on the driver's seat side of the vehicle, but the present invention is not limited to this, and is installed on the passenger seat side of the vehicle. It can also be configured as a side airbag device housed in an airbag device or a passenger's seat.

  Moreover, when using the airbag apparatus of this invention as a side airbag apparatus, attachment of a module cover can be abbreviate | omitted. Furthermore, in the present invention, for example, the ring retainer 3 and the inflator 19 included in the airbag device 1 of the embodiment can be integrally formed and configured as one holding tool.

  Furthermore, in the airbag device 1, three step portions 17 are formed along the three outer edge portions of the base member 5, but in the present invention, steps formed along the outer edge portion of the base member. The number and position of the parts are not particularly limited, and can be changed according to the size of the airbag body, the folding method, and the like. For example, as shown in FIGS. 4 (a) and 4 (b), the step is performed along two outer edges of the base member 5 on the left and right or front and rear (direction parallel to or perpendicular to the direction in which the claw 18 is disposed). The part 17 may be provided, and as shown in FIG. 4C, the step part 17 may be provided along the four outer edges of the base member 5 so as to surround the airbag body.

  Furthermore, in the above-described embodiment, the case where the wrapping sheet has one tab portion on each of the left and right side edge portions has been described. However, in the present invention, the number of tab portions of the wrapping sheet is determined if the folding portions are provided in a direction away from each other so that the folding portions arranged on the upper surface side of the airbag body do not overlap each other. For example, the tab portion can be provided not only in the left-right direction of the wrapping sheet but also in the front and / or rear, and further in the oblique direction.

  In this way, by increasing the number of tab portions, the support of the airbag body to the base member can be further stabilized. Further, for example, when four folding parts are folded on the upper surface side of the airbag body (see Patent Document 1), tab portions are provided in the four directions of the upper and lower sides and the left and right sides of the wrapping sheet. By locking the tab portions in the four directions to the base member after being supported and fixed to the base member, it is possible to more reliably prevent the folded portions of the airbag body from overlapping each other.

It is the disassembled perspective view which decomposed | disassembled and showed typically the airbag apparatus which concerns on this invention. It is the perspective view which showed typically the airbag apparatus of the assembled state. It is a front view of a wrapping sheet. It is the perspective view which showed the modification of the base member. It is the disassembled perspective view which decomposed | disassembled and showed typically the conventional airbag apparatus. It is the side view which showed the state in which the folding part of the airbag main body overlapped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airbag apparatus 2 Airbag main body 3 Ring retainer 3a Stud bolt 4 Lapping sheet 4a Notch 5 Base member 6 Insertion hole 7 Tab part 8 Locking groove 9 Slit 10 Subassembly 11 1st folding part 12 2nd folding part 14 Inflator Insertion hole 15 Stud bolt insertion hole 16 Holding surface 17 Step part 17a Inner side surface 18 Claw part 19 Inflator 19a Gas generation part 20 Insertion hole 21 Subassembly 22 Airbag body 22a Folding part 23 Ring retainer 23a Stud bolt 24 Wrapping sheet 25 Base member

Claims (6)

The wrapping sheet (4) and held covered from above the air bag body (2) folded in a predetermined shape, the sub-assembly wherein the folded shape of the airbag body (2) assembled so as not to collapse (10) An airbag device (1) comprising: a base member (5) that supports the subassembly (10); and an inflator (19) that supplies inflation gas into the airbag body (2). ,
Said wrapping sheet (4), said wrapping sheet having a first engagement portion at least of the pair formed on the edges facing (4), said base member (5), each said respective first engagement portion A second engaging portion engageable;
The airbag apparatus according to claim 1, wherein the wrapping sheet (4) is further tightened with respect to the base member (5) by the engagement of the first engaging portions and the second engaging portions . The subassembly (10) is composed of the airbag body (2), the wrapping sheet (4), and a holder (3) having a stud bolt (3a),
The retainer (3) inserted into the airbag body (2) has the stud bolt (3a) protruding outward from the airbag body (2), and the airbag body (2). Attached to the
Said base member (5), said attached to the stud bolt protruding from the airbag main body (2) (3a), the lower surface of the air bag body (2) between said retainer (3) The airbag apparatus according to claim 1, wherein the airbag apparatus is clamped and fixed. The first engaging portion of the wrapping sheet (4) is a tab portion (7) that is hooked and fixed to the base member (5),
The airbag device according to claim 1 or 2 , wherein the second engaging portion of the base member (5) is a claw portion (18) for locking the tab portion (7). The airbag body (2) is folded in a roll shape or a bellows shape, and at least two folded portions (12) are folded in parallel on the upper surface side,
Said wrapping sheet (4) is pre-Symbol least two of said folded portion (12) of at least a pair of said tab portions tightening increases in a direction away from each other in the air bag body (2) to become a (7) The airbag device according to claim 3, wherein The airbag device according to claim 3 or 4, wherein the tab portion (7) is formed by cutting the wrapping sheet (4). Said base member (5) has its stepped portion that bulges upward at least a portion of the upper surface side outer edge (17), said stepped portion (17), said to said base member (5) top surface 6. The airbag device according to claim 1 , wherein the airbag device is formed as a guide for the subassembly (10) .

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