JP6565821B2 - Seat cushion airbag device - Google Patents

Description

  In the present invention, an air bag disposed in a seat portion of a vehicle seat such as a vehicle seat is inflated with inflation gas to raise the seat surface, and a restrained object such as an occupant on the seat portion moves forward. The present invention relates to a seat cushion airbag device that is restricted from doing so.

  In a vehicle, when an impact is applied to the vehicle from the front due to a frontal collision or the like, the occupant's waist restrained by the seat for the vehicle by the seat belt device moves away from the lap belt and moves forward (slips forward). It becomes a problem. Therefore, various measures have been taken or proposed to suppress this phenomenon.

  One of them is a seat cushion airbag device applied as a seat portion to a vehicle seat having a seat cushion supported from below by a support portion of a seat frame (see, for example, Patent Document 1).

  As shown in FIG. 15, the seat cushion airbag device includes at least an airbag 101 and an elongated gas generator 107. The airbag 101 is disposed between the support portion and the seat cushion. Inserted in the front end portion of the airbag body 102 constituting the outer shell portion of the airbag 101 in the vehicle seat width direction (vehicle width direction) and having a dimension in the same direction shorter than the length of the gas generator 107 A mouth 103 is formed. Insertion holes are respectively formed at a plurality of locations at the front end portion of the lower fabric portion 104 constituting the lower portion of the airbag body 102 and spaced from each other in the width direction of the vehicle seat. These insertion holes include a specific insertion hole 105 farthest from a harness 108 described later of the gas generator 107 and other general insertion holes 106.

  The gas generator 107 is disposed at the front end portion in the airbag main body 102 in a posture extending in the vehicle width direction. A harness 108 is connected to one end of the gas generator 107. In the gas generator 107, bolts extend downward from a plurality of locations separated from each other in the length direction. These bolts include a specific bolt 109 farthest from the harness 108 and other general bolts 110.

  The specific bolt 109 is inserted into the specific insertion hole 105 and fastened to the support portion of the seat frame. The general bolt 110 is inserted into the corresponding general insertion hole 106 and fastened to the support portion. The harness 108 is drawn out of the airbag body 102 through the insertion port 103.

The seat cushion airbag device is configured as described above.
Therefore, when an impact is applied to the vehicle from the front of the vehicle seat due to a front collision or the like, the occupant tries to move forward due to inertia. This occupant is held on the seat by the holding action of the seat belt device. However, depending on the position of the occupant, the waist may move forward.

  On the other hand, in the seat cushion airbag device, the inflation main body 102 is inflated by inflating the inflation gas from the gas generator 107 in response to the impact from the front. The seat cushion is pushed up, and the seat surface of the seat is raised. In the thigh of the occupant restrained by the vehicle seat by the seat belt device, the vicinity of the rear side of the knee is pressed upward, and the waist is pressed against the lap belt. The ability of the lap belt portion to restrain the occupant is enhanced, and the forward movement (front slip) of the waist is restricted.

  By the way, in the seat cushion airbag device, when the gas generator 107 is assembled in the airbag main body 102, the gas generator 107 passes through the insertion port 103 from the end of the harness 108 that is not connected. The air bag body 102 is inserted into the front end portion. As shown in FIG. 15, the specific bolt 109 is inserted into the specific insertion hole 105.

  Subsequently, the gas generator 107 is turned to the side closer to the insertion port 103 with the specific bolt 109 as the turning center (fulcrum). By this turning, the gas generator 107 enters the front end portion in the airbag body 102 through the insertion port 103. However, the harness 108 connected to the gas generator 107 is pulled out of the airbag body 102 through the insertion port 103.

  Then, as indicated by a two-dot chain line in FIG. 15, when the general bolt 110 matches the general insertion hole 106, the general bolt 110 is inserted into the corresponding general insertion hole 106. Then, the gas generator 107 is locked in a state where it is positioned with respect to the airbag body 102.

  With the above insertion, the specific bolt 109 and the general bolt 110 protrude to the outside of the airbag body 102. The specific bolt 109 and the general bolt 110 are fastened to the seat at the protruding portion.

JP 2009-132245 A

  However, in the conventional seat cushion airbag device, when a long gas generator 107 is used, the gas generator 107 is swung around the specific bolt 109 inserted into the specific insertion hole 105 as a turning center. In some cases, the gas generator 107 is caught on the end of the insertion port 103 on the side close to the harness 108. In this case, it is difficult for the gas generator 107 to pass through the insertion port 103 and enter the front end portion of the airbag body 102.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a seat cushion airbag that can facilitate assembly of a gas generator in an airbag and improve assembly workability. To provide an apparatus.

  A seat cushion airbag device that solves the above problems is disposed in a seat portion of a vehicle seat, and an outer shell portion is formed of an airbag body, and is disposed in a peripheral portion in the airbag body. And at least one elongated gas generator having a harness connected to one end thereof, and the airbag main body is inflated with an inflating gas from the gas generator so that the seat surface of the seat portion is inflated. A seat cushion airbag device that is raised and restricts the forward movement of the restrained object on the seat, and extends along the peripheral edge of the peripheral edge of the airbag, and An insertion port having a dimension shorter than the length of the gas generator is formed, and the bolts extending downward from a plurality of locations separated from each other in the length direction of the gas generator are respectively provided in the airbag. The plurality of insertion holes formed in the peripheral edge portion of the lower cloth part constituting the lower part of the body are inserted into the corresponding ones and fastened to the seat part, and the harness passes through the insertion port. The lower fabric portion is formed with a slit extending from the insertion hole farthest from the harness to the side away from the adjacent insertion hole. Yes.

  According to said structure, when assembling a gas generator in an airbag, a gas generator is inserted in the peripheral part in an airbag main body through an insertion port from the edge part by which the harness is not connected. The Here, the bolt farthest from the harness is referred to as a specific bolt in order to distinguish it from other bolts, and the insertion hole farthest from the harness is referred to as a specific insertion hole in order to distinguish from other insertion holes. The specific bolt is inserted into the specific insertion hole, and is moved from the specific insertion hole to the slit.

  Subsequently, the gas generator is turned to the side closer to the insertion port with the specific bolt as the turning center (fulcrum). Under the present circumstances, as above-mentioned, the specific volt | bolt has moved to the slit from the specific insertion hole, and the specific volt | bolt is kept away from the edge part near the harness among the both ends in the direction where an insertion port is extended. Therefore, it is difficult for the gas generator to be caught by the end portion of the insertion port near the harness during the turning. By the turning, the gas generator enters the peripheral portion in the airbag body through the insertion port. The harness connected to the gas generator is pulled out of the airbag body through the insertion port.

  And a gas generator is moved to the harness side in the attitude | position extended in the direction where the several penetration hole is arrange | positioned. Along with this, the specific bolt is moved from the slit to the specific insertion hole. When the other bolts are aligned with the insertion holes and the bolts are inserted into the corresponding insertion holes, the gas generator is locked in a state of being positioned with respect to the airbag body.

Each bolt protrudes outside the airbag body by the above insertion. Each bolt is fastened to the seat at the protruding portion.
In the seat cushion airbag device, the peripheral edge portion in the airbag body includes a front end portion in the airbag body, and the gas generator extends in a width direction of the vehicle seat. Arranged at the front end portion in the airbag body, the insertion port extends in the width direction of the vehicle seat at the front end portion of the airbag, and the plurality of insertion holes are front end portions of the lower cloth portion. It is preferable to be formed.

  According to the above configuration, when the gas generator is assembled in the airbag, the gas generator is inserted into the front end portion of the airbag body through the insertion port from the end portion on the side where the harness is not connected. The specific bolt is inserted into the specific insertion hole and is moved from the specific insertion hole to the slit.

  Subsequently, the gas generator is turned to the side closer to the insertion port with the specific bolt as the turning center (fulcrum). Due to the turning, the gas generator enters the front end portion of the airbag body through the insertion port. The harness connected to the gas generator is pulled out of the airbag body through the insertion port.

  And the gas generator is moved to the harness side when it becomes the attitude | position extended in the width direction of the vehicle seat. Along with this, the specific bolt is moved from the slit to the specific insertion hole. When the other bolts are aligned with the insertion holes and the bolts are inserted into the corresponding insertion holes, the gas generator is locked in a state of being positioned with respect to the airbag body.

  In the seat cushion airbag device, in addition to the lower cloth portion, the airbag main body includes an upper cloth portion constituting an upper portion of the airbag main body, a peripheral edge portion of the lower cloth portion, and a peripheral edge portion of the upper cloth portion. A peripheral edge coupling part that couples each other, and the peripheral edge coupling part includes a pair of side edge coupling parts that extend in the front-rear direction in a state of being separated from each other in the width direction of the vehicle seat, and a front end of each side edge coupling part A pair of front end joints extending to the opposite side edge joint part side, and at least a part of the insertion port is between the lower cloth part and the upper cloth part and sandwiched between both front end joint parts The front end coupling portion is configured by an outer insertion port, and the extension length of each front end coupling portion from the side edge coupling portion is different between the front end coupling portions, and the slit is the front end coupling portion having a short extension length. Extending from the farthest insertion hole Preferred.

  Here, from the front end of each side edge coupling portion, the front end coupling portion extends toward the opposite side edge coupling portion, but the extension length of these front end coupling portions is the airtightness of the airbag body. Affects. As the extension length of the front end coupling portion becomes longer, the dimension of the insertion port in the width direction of the vehicle seat becomes smaller and the air tightness of the airbag body becomes higher. On the other hand, if the extension length of the front end coupling portion on the side closer to the harness becomes longer, when the gas generator is turned with the specific bolt as the turning center, the gas generator and the harness are at the end of the insertion port. It becomes easy to get caught. In order to solve this problem, the slit must be lengthened. On the other hand, when the extension length of the front end coupling portion on the side far from the harness is long, the front end coupling portion is unlikely to hinder the turning of the gas generator.

  In this regard, according to the above configuration, the slit extends from the insertion hole farthest from the front end coupling portion having a short extension length. In other words, the extension length of the front end joint on the side closer to the harness is shorter than the extension length of the front end joint on the far side. Therefore, even if the slit extending from the specific insertion hole is short, the gas generator and the harness are not easily caught at the end of the insertion port when the gas generator is turned around the specific bolt as a turning center. In addition, since the extension length of the front end coupling portion on the side far from the harness is set to be long, the size of the insertion port in the width direction of the vehicle seat is reduced, so that the air tightness of the airbag body is enhanced and the airbag is inflated. Leakage of working gas is effectively suppressed.

  In the seat cushion airbag device, at least a part of the insertion port is configured by an outer insertion port formed at a front end portion of the airbag main body, and the front side of the outer insertion port of the airbag main body. A flap portion is formed, and a holding portion is further provided for holding the flap portion in a state of being covered with the front end portion of the airbag body so that the outer insertion port and the slit are closed. Preferably it is.

Here, in the seat cushion airbag device, the outer insertion opening and the slit can serve as a passage for the inflation gas from the gas generator.
In this regard, according to the above configuration, the flap portion is put on the front end portion of the airbag body so that the outer insertion opening and the slit are closed. Moreover, the flap portion is held in the above state by the holding portion. Therefore, the airbag is in a highly airtight state.

  In the seat cushion airbag device, it is preferable that the holding portion includes all the bolts of the gas generator and a locking hole provided in the flap portion and locked to the bolt.

  According to said structure, the front-end part of an airbag main body so that the outer insertion port and a slit may be plugged up by the latching hole of a flap part being latched by the volt | bolt of a gas generator. It is held in a state where it is put on. Therefore, for this holding, it is not necessary to separately provide a holding portion having a configuration different from that of the bolt and the locking hole. Further, a space for installing the holding portion is not necessary.

  In the seat cushion airbag apparatus, a gas discharge portion is provided that is disposed in the airbag main body in a state of wrapping the gas generator, and discharges inflation gas from the gas generator to the airbag main body. The inner bag is further provided as a part of the airbag, and the insertion port is surrounded by the outer insertion port formed at the front end of the airbag body and the outer insertion port. The inner bag is formed with an inner insertion hole formed in a front end portion, and the inner bag is formed with an inner insertion hole into which the plurality of bolts are inserted, and the inner bag has the inner insertion hole. The inner slit extending from the inner insertion hole farthest from the harness to the side away from the adjacent inner insertion hole is formed. It is preferred that.

  According to said structure, when assembling a gas generator to the airbag by which an inner bag is arrange | positioned in an airbag main body, a gas generator inserts into an insertion port from the edge part by which the harness is not connected. The air bag is inserted into the inner bag through the (outer insertion port and inner insertion port). Here, in order to distinguish the inner insertion hole farthest from the harness from other inner insertion holes, it is referred to as a specific inner insertion hole. The specific bolt is inserted into the specific insertion hole and the specific inner insertion hole, and is moved to the slit and the inner slit.

  Subsequently, the gas generator is turned to the side closer to the insertion port with the specific bolt as the turning center (fulcrum). At this time, as described above, the specific bolt is moved to the slit and the inner slit, and the specific bolt is moved away from the end portion on the side close to the harness of both ends of the insertion port in the width direction of the vehicle seat. Yes. Therefore, it is difficult for the gas generator to be caught on the end of the insertion port (inner insertion port) near the harness during the turning. Due to the turning, the gas generator enters the inner bag in the front portion of the airbag body through the insertion port (inner insertion port). The harness connected to the gas generator is pulled out to the outside of the airbag body and the inner bag through the insertion port.

  And the gas generator is moved to the harness side when it becomes the attitude | position extended in the width direction of the vehicle seat. Accordingly, the specific bolt is moved from the slit and the inner slit to the specific insertion hole and the specific inner insertion hole. When other bolts are aligned with the insertion hole and the inner insertion hole, when these bolts are inserted into the corresponding insertion hole and the inner insertion hole, the gas generator is positioned with respect to the airbag body and the inner bag. Locked.

By the insertion, each bolt projects to the outside of the inner bag and the airbag body. Each bolt is fastened to the seat at the protruding portion.
In the seat cushion airbag device, an inner flap portion is formed on the front side of the inner insertion port of the inner bag, and at least the inner insertion port and the inner slit are blocked by the inner flap portion. Further, it is preferable that an inner holding portion for holding the airbag body in a state where it is put on the front end portion of the airbag body is further provided.

Here, in the seat cushion airbag device in which the inner bag is used as described above, the inner insertion port and the inner slit can serve as a passage for the inflation gas from the gas generator.
In this regard, according to the above-described configuration, the inner flap portion is put on the front end portion of the airbag body so that at least the inner insertion opening and the inner slit are closed. Moreover, the inner flap portion is held in the above state by the inner holding portion. Therefore, the airbag is in a highly airtight state.

  In the seat cushion airbag device, the inner holding portion includes all the bolts of the gas generator, and an inner locking hole provided in the inner flap portion and locked to the bolt. preferable.

  According to the above configuration, the inner flap portion includes at least the inner insertion opening and the inner fastener by engaging the inner locking hole of the inner flap portion that covers the front end portion of the airbag body with the bolt of the gas generator. It is held in a state where it is put on the front end of the airbag body so that the slit is closed. Therefore, for this holding, it is not necessary to separately provide an inner holding portion having a configuration different from that of the bolt and the inner locking hole. Further, a space for installing the inner holding portion is not necessary.

  According to the seat cushion airbag device, the gas generator can be easily assembled in the airbag to improve the assembly workability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment embodied in the vehicle seat cushion airbag apparatus, and is a sectional side view which shows the vehicle seat incorporating the airbag apparatus with a passenger | crew and a seatbelt apparatus. The partial side sectional view which expands and shows the X section in FIG. The perspective view which shows the vehicle seat and seatbelt apparatus in FIG. In FIG. 2, the partial expanded side sectional view which shows the state by which the airbag was fastened by the accommodation recessed part of the seat pan. (A) is a figure which shows the airbag module in one Embodiment, The bottom view which shows the state before the flap part of an airbag main body and the inner flap part of an inner bag are turned back downward, (b) The partial bottom view which expands and shows a part of Fig.5 (a). The bottom view which shows the airbag module by which the flap part and inner flap part in Fig.5 (a) were turned back downward and latched by the front-end part of the airbag main body. The bottom view of each structural member (an airbag main body, an inner bag, and a gas generator) of the airbag module in Fig.5 (a). The expanded view of each cloth piece used for the airbag main body and inner bag in FIG. 7, and the side view of a gas generator. In one Embodiment, the partial bottom view explaining the state in the middle of the gas generator being assembled | attached to the front-end part in an airbag. (A) is the partial bottom view explaining the state in the middle of assembling the gas generator in the front end part in an air bag in one embodiment, and (b) expands a part of Drawing 10 (a) similarly. FIG. Similarly, in one Embodiment, the partial bottom view explaining the state in the middle of the gas generator being assembled | attached to the front-end part in an airbag. Similarly, in one Embodiment, the partial bottom view explaining the state in the middle of the gas generator being assembled | attached to the front-end part in an airbag. The partial sectional side view which shows the state by which the inner bag and the airbag main body were expanded from the state of FIG. 2, and the seat surface of the seat part was raised. It is a figure which shows the modification by which the inner bag was not used but the airbag was comprised only by the airbag main body, and is the partial bottom view corresponding to Fig.5 (a). It is a figure which shows the conventional seat cushion airbag apparatus, and is a bottom view explaining the state in the middle of a gas generator being assembled | attached to the front-end part in an airbag corresponding to Fig.10 (a).

Hereinafter, an embodiment embodied in a vehicle seat cushion airbag device (hereinafter simply referred to as “airbag device”) will be described with reference to FIGS. 1 to 13.
In the following description, the forward direction of the vehicle is described as forward, and front, rear, upper, lower, left, and right are defined based on the forward direction. In FIG. 3, “inside” indicates the inside of the vehicle and “outside” indicates the outside of the vehicle. The inner side of the vehicle is a side approaching the central position in the width direction of the vehicle, and the outer side of the vehicle is a side away from the central position. In addition, it is assumed that an occupant having the same physique as the collision test dummy is seated on the vehicle seat.

  As shown in FIG.1 and FIG.3, the vehicle seat S is installed in the vehicle as a vehicle as a vehicle seat. The vehicle seat S includes a seat portion (seat cushion) 10, a backrest portion (seat back) 21 that is erected from the rear side of the seat portion 10 and that can adjust an inclination angle, and an upper side of the backrest portion 21. The headrest 22 is provided. The vehicle seat S is installed in the vehicle in a posture in which the backrest portion 21 faces the front of the vehicle. The front-rear direction of the vehicle seat S installed in this manner matches the front-rear direction of the vehicle, and the width direction of the vehicle seat S matches the width direction of the vehicle (vehicle width direction).

  The seat portion 10 is a place where an occupant P who is a subject (constrained subject) restrained by the airbag device is seated. The seat portion 10 includes a seat cushion 11 and a steel sheet seat pan 13 as a support portion that supports the seat cushion 11 from below. The seat cushion 11 is covered with a cover 12 made of cloth or leather. An accommodation recess 14 for accommodating a part (front part) of an airbag module AM described later is formed in the front part of the seat pan 13. The housing recess 14 extends in the vehicle width direction with the upper surface opened.

The vehicle is equipped with a seat belt device 30 for restraining an occupant P seated on the vehicle seat S.
The seat belt device 30 includes a belt-like webbing 31 that restrains the occupant P, a tongue 32 that is attached to the webbing 31 so as to be movable in the length direction thereof, and a tongue 32 that is disposed on the vehicle interior side of the seat portion 10. And a buckle 33 that is detachably mounted. One end of the webbing 31 is fixed to the vehicle outer side of the seat 10 and the other end is wound by a belt winding device (not shown) disposed on the vehicle outer side. In the seat belt device 30, the lengths of the lap belt portion 34 and the shoulder belt portion 35 can be changed by sliding the tongue 32 along the webbing 31.

  The lap belt portion 34 is a portion of the webbing 31 from the tongue 32 to the end portion (fixed end) of the webbing 31, and the other portion passes from one side of the waist portion PP of the seated passenger P through the front of the waist portion PP. It is bridged to the side. The shoulder belt portion 35 is a portion of the webbing 31 from the tongue 32 to the belt take-up device, and is bridged from the shoulder portion PS of the seated occupant P to the side of the lumbar portion PP diagonally in front of the chest portion PT. It is.

  The vehicle is provided with an airbag device for suppressing the submarine phenomenon. In the submarine phenomenon, when an impact is applied to the vehicle from the front due to a frontal collision or the like, the waist portion PP of the occupant P restrained by the seat S for the vehicle by the seat belt device 30 disengages from the lap belt portion 34 and moves forward. This is a phenomenon of moving to the front (sliding forward).

  FIG. 2 shows a schematic configuration of the airbag apparatus. However, in FIG. 2, illustration of details is omitted. As shown in FIG. 2, the airbag device includes an airbag module AM, an impact sensor 91, and a control device 92.

  The airbag module AM includes a gas generator 40 and an airbag 50. Further, the airbag 50 includes an airbag body 51 and an inner bag 70. Next, each part which comprises the airbag module AM is demonstrated.

<Configuration of gas generator 40>
As shown in FIGS. 7 and 8, the gas generator 40 is for supplying the inflation gas G to the airbag 50, and includes an inflator 41 and a retainer 43 that covers the inflator 41. Here, a type called a pyrotype is used as the inflator 41. The inflator 41 has a long shape (substantially columnar shape) extending in the vehicle width direction, and a gas generating agent (not shown) that generates the expansion gas G is accommodated therein. A gas ejection part 41 a that ejects the expansion gas G is provided at one end of the inflator 41 in the vehicle width direction. Further, a harness 42 serving as an input wiring for a control signal to the inflator 41 is connected to the other end of the inflator 41 in the vehicle width direction.

  As the inflator 41, a type different from the above pyro type may be used. Such types include stored gas types in which the bulkhead of a high-pressure gas cylinder filled with high-pressure gas is ruptured with explosives and the like, and a hybrid type in which both a pyro type and a stored gas type are combined. Can be mentioned.

  On the other hand, most of the retainer 43 is formed in an elongated substantially cylindrical shape by bending a plate material such as a metal plate. Both ends of the retainer 43 are opened. Further, on the lower surface of the retainer 43, bolts extending downward are fixed to a plurality of locations (three locations in the present embodiment) spaced apart from each other in the vehicle width direction. In order to distinguish these bolts, one bolt positioned farthest from the harness 42 is referred to as a specific bolt 44 and the remaining two bolts are referred to as general bolts 45.

The inflator 41 may have a configuration provided integrally with the retainer 43.
<Configuration of Airbag Body 51>
The airbag body 51 is a member that constitutes an outer shell portion of the airbag 50, and has a function of raising the seat surface 10a of the seat portion 10 by being inflated. The airbag body 51 extends along a fold line 52 in which one or a plurality of cloth pieces (also referred to as a base cloth, a panel cloth, etc.) superposed on each other in a substantially rectangular shape elongated in the front-rear direction are set at the center portion of the airbag body 51. It is formed by folding in half and overlapping in the vertical direction, and joining the overlapped parts into a bag shape. Here, in order to distinguish the two overlapping portions of the airbag body 51, the upper portion is referred to as the upper cloth portion 53, and the lower portion is referred to as the lower cloth portion 54. .

As the upper cloth part 53 and the lower cloth part 54, a woven cloth formed using a material having high strength and flexibility, for example, polyester yarn, polyamide yarn or the like is suitable.
The upper cloth portion 53 and the lower cloth portion 54 are connected to each other at a peripheral edge connecting portion 55 provided at the peripheral edge thereof. In other words, the peripheral edge portion of the lower cloth portion 54 and the peripheral edge portion of the upper cloth portion 53 are connected to each other by the peripheral edge connecting portion 55. In the present embodiment, the peripheral edge coupling portion 55 is formed by sewing (sewing with a sewing thread) a portion excluding the front end portion of the respective peripheral edge portions of the upper cloth portion 53 and the lower cloth portion 54. This also applies to the side edge coupling portions 74 and 75 described later.

  The peripheral edge coupling portion 55 includes a pair of side edge coupling portions 56 and 57, a rear coupling portion 58, and a pair of front end coupling portions 59 and 60. The side edge coupling portions 56 and 57 extend in the front-rear direction while being separated from each other in the vehicle width direction. The rear coupling portion 58 has an arc shape that swells rearward. Both end portions of the rear coupling portion 58 are connected to the rear end portions of the both side edge coupling portions 56 and 57. Note that the rear coupling portion 58 may be formed in a shape different from the arc shape, for example, a linear shape.

  Each front end coupling portion 59, 60 extends from the front end of each side edge coupling portion 56, 57 toward the front end of the opposite side edge coupling portion 57, 56. As shown in FIG. 5A, the extension length from the side edge coupling portion 57 of the front end coupling portion 60 on the gas ejection portion 41a side is L1, and the side edge coupling portion 56 of the front end coupling portion 59 on the harness 42 side. In this embodiment, the extension lengths L1 and L2 are set so that the relationship of L1> L2 is established.

  Regarding the above sewing, in FIGS. 5, 6, and 9 to 12, the sewing portion is expressed by two line types. The same applies to FIG. 14 used for explaining the modification and FIG. 15 used for explaining the prior art. The first line type is a line in which thick lines of a certain length are intermittently arranged and represents a state in which the sewing thread is viewed from above or below (the peripheral joint portion 55 in FIG. 5A). Etc.). The second line type is a line in which fine lines having a certain length (longer than a general broken line) are intermittently arranged, which is, for example, between the upper cloth part 53 and the lower cloth part 54. It shows the state of the thread that is positioned and cannot be directly seen (hidden) (see the side edge coupling portions 74, 75, etc. in FIG. 5A).

  In the present embodiment, since the airbag body 51 has a structure in which a piece of cloth is folded in two, the connection (sewing) by the peripheral connection part 55 (rear connection part 58) in the vicinity of the folding line 52 is performed. It can be omitted.

  In the present embodiment, the cloth piece is folded in two so that the fold line 52 is positioned at the rear end of the airbag body 51. However, the cloth piece is folded so that the fold line 52 is positioned at the other end. It may be folded in half. The airbag main body 51 may be composed of a plurality of cloth pieces divided along the fold line 52. In this case, the airbag main body 51 is formed by stacking a plurality of pieces of cloth in the vertical direction and connecting the pieces of cloth so as to form a bag shape. As the number of pieces of cloth used increases, the strength of the airbag body 51 increases. Such a change is possible for the inner bag 70 as well.

  Further, the peripheral edge coupling portion 55 may be formed by a coupling means different from the sewing using the above-described sewing thread, for example, adhesion using an adhesive, welding, or the like. This also applies to the side edge coupling portions 74 and 75 described later.

  As shown in FIGS. 5A and 7, in the airbag main body 51 in which the upper cloth portion 53 and the lower cloth portion 54 are joined by the peripheral joint portion 55, the portion surrounded by the peripheral joint portion 55 is inflated. It becomes a location (expanded portion) that is expanded by the working gas G.

  Further, in a place where the front end portion of the airbag body 51 is not joined by the peripheral joint portion 55, in other words, between the lower cloth portion 54 and the upper cloth portion 53, the air bag body 51 is sandwiched between both front end joint portions 59 and 60. This portion constitutes the outer insertion port 62. The outer insertion port 62 constitutes a part of the insertion port at the front end portion of the airbag 50. The dimension of the outer insertion port 62 in the vehicle width direction is set to be shorter than the length of the gas generator 40 (excluding the harness 42).

  In the lower cloth portion 54, the gas generator 40 is located at locations separated from the outer insertion port 62 rearward (front end portion of the lower fabric portion 54) and at a plurality of locations separated from each other in the vehicle width direction (three locations). One specific insertion hole 63 for inserting the specific bolt 44 and two general insertion holes 64 for inserting the general bolt 45 are formed. The specific insertion hole 63 is closest to the front end coupling portion 60 having the extension length L1 and is farthest from the front end coupling portion 59 having the extension length L2.

  As shown in FIGS. 5A and 5B, the lower cloth portion 54 is formed with a slit 68 that starts from the specific insertion hole 63 and extends away from the adjacent general insertion hole 64. In the present embodiment, the slit 68 extends from the specific insertion hole 63 toward the side opposite to the adjacent general insertion hole 64.

  Further, as shown in FIGS. 7 and 8, a flap portion 65 that protrudes forward is integrally formed at the front end portion of the upper fabric portion 53. The place where the flap portion 65 is provided is on the front side of the outer insertion port 62. The flap portion 65 covers the front end portion of the airbag main body 51 so that the outer insertion port 62 and the slit 68 are closed.

  In the flap portion 65, at a plurality of locations (three locations) separated from each other in the vehicle width direction, a specific locking hole 66 for locking the flap portion 65 to the specific bolt 44 and the flap portion 65 are connected to the general portion. A general locking hole 67 for locking to the bolt 45 is formed.

  The specific locking hole 66 and the two general locking holes 67, and the specific bolt 44 and the two general bolts 45, the airbag main body 51 so that the flap portion 65 is closed by the outer insertion port 62 and the slit 68. The holding | maintenance part hold | maintained in the state covered on the front-end part of this is comprised.

  From the viewpoint of the form of inflation, the airbag main body 51 has a rear inflating part 50r that inflates in the vicinity of the lower part of the thigh PF of the occupant P and a lower part of the knee part PN of the occupant P, as shown in FIG. And a front expansion portion 50f that expands to a position higher than the rear expansion portion 50r.

<Configuration of inner bag 70>
As shown in FIGS. 7 and 8, the inner bag 70 is a member that constitutes the airbag 50 together with the airbag main body 51, and is disposed in the airbag main body 51 (the front inflating portion 50 f), and the gas generator 40. Enveloping. The inner bag 70 folds one piece or a plurality of pieces of cloth overlapped with each other along a fold line 71 set at the center part of the inner bag 70 and overlaps them in the vertical direction. It is formed by combining so that. The cloth piece is formed in a rectangular shape elongated in the front-rear direction using the same material as that of the airbag body 51. Here, in order to distinguish the above-described two overlapped portions of the inner bag 70, the one located on the upper side is called the upper inner cloth portion 72, and the one located on the lower side is called the lower inner cloth portion 73. To do.

  The above-described connection between the upper inner cloth portion 72 and the lower inner cloth portion 73 is made by a pair of side edge connecting portions 74 and 75. Each side edge joint part 74 and 75 is extended in the front-back direction along the side edge part in the vehicle width direction of the upper inner cloth part 72 and the lower inner cloth part 73.

  In the inner bag 70 in which the upper inner cloth portion 72 and the lower inner cloth portion 73 are coupled by the pair of side edge coupling portions 74 and 75, the portion surrounded by the side edge coupling portions 74 and 75 and the fold line 71 is for expansion. It becomes a location (expanded portion) that is expanded by the gas G.

  In the present embodiment, the inner bag 70 has a configuration in which a cloth piece is folded in two. However, in addition to the side edge coupling portions 74 and 75, the fold line 71 is located near the fold line 71. The coupling may be performed by newly providing a coupling portion extending along the line.

  Further, an inner flap portion 76 that protrudes forward is integrally formed at the front end portion of the upper inner cloth portion 72. The place where the inner flap portion 76 is provided is in front of an inner insertion port 77 described later. The inner flap portion 76 has substantially the same shape and size as the flap portion 65. The inner flap portion 76 covers the front end portion of the airbag body 51 so that the inner insertion port 77 and the inner slit 80 are closed.

  As shown in FIGS. 5A and 7, the inner bag 70 is disposed in the front half of the airbag main body 51 with the inner flap 76 being superimposed on the flap 65 of the airbag main body 51. ing. The upper inner cloth portion 72 and the lower inner cloth portion 73 are coupled (co-sewn) together with the upper cloth portion 53 and the lower cloth portion 54 by the front end coupling portions 59 and 60 of the peripheral edge coupling portion 55. . In this way, the inner bag 70 is attached to the airbag body 51.

  A portion between the upper inner cloth portion 72 and the lower inner cloth portion 73 and sandwiched between both front end coupling portions 59 and 60 constitutes an inner insertion port 77. The inner insertion port 77 is located in the outer insertion port 62 of the airbag main body 51 described above and is surrounded by the outer insertion port 62, and together with the outer insertion port 62, a front end portion of the airbag 50. It constitutes the insertion slot.

  The insertion port composed of the outer insertion port 62 and the inner insertion port 77 is used to insert the gas generator 40 into the airbag 50 or to pull out the harness 42 of the inserted gas generator 40 to the outside of the airbag 50. Used to

  In the front end portion of the lower inner cloth portion 73, one specific inner insertion hole 78 for inserting the specific bolt 44 and the general bolt 45 are inserted into a plurality of locations (three locations) spaced apart from each other in the vehicle width direction. Two general inner insertion holes 79 are formed for this purpose.

  The specific inner insertion hole 78 is closest to the front end coupling portion 60 having the extension length L1 and is farthest from the front end coupling portion 59 having the extension length L2. The specific inner insertion hole 78 is an inner insertion hole farthest from the harness 42 among the three inner insertion holes.

  The lower inner cloth portion 73 is formed with an inner slit 80 that starts from the specific inner insertion hole 78 and extends away from the adjacent general inner insertion hole 79. In the present embodiment, the inner slit 80 extends from the specific inner insertion hole 78 toward the side opposite to the adjacent general inner insertion hole 79.

  Further, in the inner flap portion 76, at a plurality of locations (three locations) separated from each other in the vehicle width direction, a specific inner locking hole 81 for locking the inner flap portion 76 to the specific bolt 44, and the inner A general inner locking hole 82 for locking the flap portion 76 to the general bolt 45 is formed.

  These specific inner locking holes 81 and both general inner locking holes 82 and the specific bolts 44 and both general bolts 45 are configured so that the inner flap portion 76 is blocked by the inner insertion port 77 and the inner slit 80. An inner holding portion that holds the airbag body 51 in a state of being covered with the front end portion is configured.

  As shown in FIGS. 7 and 8, in the inner bag 70 in a folded state, the two rear portions of the upper inner cloth portion 72 and the lower inner cloth portion 73 are separated from each other in the vehicle width direction. Is provided with a gas discharge part for the expansion gas G. Each of these gas discharge portions is constituted by gas discharge holes 83 and 84 formed of round holes. The gas discharge holes 83 and 84 are for communicating the inside and outside of the inner bag 70 and discharging the inflation gas G ejected from the gas generator 40 to the airbag body 51.

<Attachment Mode of Gas Generator 40 to Airbag 50>
The gas generator 40 described above is inserted into the airbag body 51 and into the inner bag 70 through the inner insertion port 77 and the outer insertion port 62 as shown in FIGS. 5 (a), 5 (b) and FIG. Has been. The gas generator 40 is arranged in a posture extending in the vehicle width direction. A front end portion where the gas generator 40 is disposed in the airbag main body 51 is included in a peripheral edge portion in the airbag main body 51. One specific bolt 44 in the gas generator 40 is inserted into the corresponding specific inner insertion hole 78 and the specific insertion hole 63. The two general bolts 45 are inserted through the corresponding general inner insertion holes 79 and general insertion holes 64.

  Further, as shown in FIGS. 4 and 6, the inner flap portion 76 of the inner bag 70 and the flap portion 65 of the airbag main body 51 are folded back and rearward to cover the front end portion of the airbag main body 51. ing. A specific bolt 44 is inserted into the specific inner locking hole 81 in the inner flap portion 76 and the specific locking hole 66 in the flap portion 65. Further, the general bolt 45 is inserted into the general inner locking hole 82 in the inner flap portion 76 and the general locking hole 67 in the flap portion 65. By these insertions, the inner flap portion 76 and the flap portion 65 are locked to the specific bolt 44 and the both general bolts 45. By these engagements, the outer insertion port 62 and the slit 68 in the airbag body 51 and the inner insertion port 77 and the inner slit 80 in the inner bag 70 are closed together, and the flap portion 65 and the inner flap portion 76 are air-filled. The bag body 51 is held in a state of being covered with the front end portion.

At this time, the harness 42 is pulled out of the airbag 50 through the inner insertion port 77 and the outer insertion port 62.
<Arrangement Mode of Airbag Module AM>
As shown in FIGS. 2 and 4, the airbag module AM is disposed in the seat portion 10 with the flap portion 65 and the inner flap portion 76 positioned on the lower side. The front portion of the airbag 50 where the gas generator 40 is disposed is housed in the housing recess 14 of the seat pan 13. In the airbag 50, the portion excluding the front portion is disposed between the seat cushion 11 and the seat pan 13 in a state where the airbag 50 is deployed in a plane without being filled with the inflation gas G. The rear end portion 51r of the airbag body 51 in the deployed state is located below the boundary portion between the thigh PF and the buttocks PB of the occupant P seated on the seat portion 10.

<Assembly Mode of Airbag Module AM>
The specific bolt 44 and the general bolt 45 that respectively protrude downward from the airbag 50 are inserted into the through-hole 16 formed in the bottom 15 of the housing recess 14. The nut 17 is screwed into the specific bolt 44 and the general bolt 45 from below, whereby the gas generator 40 is fastened to the housing recess 14 together with the airbag 50. By this fastening, the front portion of the airbag 50 is pressed against the bottom portion 15 of the housing recess 14, and the insertion port (the inner insertion port 77 and the outer insertion port 62) is closed. At this time, the specific bolt 44, the general bolt 45, and the nut 17 serve to attach the airbag main body 51, the inner bag 70, and the gas generator 40 to the vehicle (the housing recess 14 of the seat pan 13), and the flap portion 65 and the inner flap. It plays a role of holding the portion 76 in a folded state.

  As described above, the airbag device includes the impact sensor 91 and the control device 92 shown in FIG. 2 in addition to the airbag module AM. The impact sensor 91 is composed of an acceleration sensor or the like, and is attached to a front bumper (not shown) of the vehicle. The impact sensor 91 detects an impact applied to the front bumper or the like from the front in order to detect a front collision of the vehicle. The control device 92 controls the operation of the inflator 41 based on the detection signal from the impact sensor 91.

As described above, the airbag device of the present embodiment is configured. Next, the operation of this airbag device will be described.
First, an operation for assembling the gas generator 40 to the airbag 50 will be described.

  In this case, the insertion port (the inner insertion port 77 and the outer insertion port 62) is expanded in the vertical direction. In this state, as shown in FIG. 9, in the gas generator 40 inclined with respect to the insertion port, the end of the harness 42 not connected (on the side of the gas ejection portion 41 a) is near the front end coupling portion 59. To the specific inner insertion hole 78 and the specific insertion hole 63, the air bag body 51 is inserted into the inner bag 70 through the insertion port.

  The specific bolt 44 is inserted into the specific inner insertion hole 78 and the specific insertion hole 63. As shown in FIGS. 10A and 10B, the specific bolt 44 is moved along the inner slit 80 and the slit 68. The inner slit 80 and the slit 68 are expanded in the front-rear direction by the moved specific bolt 44.

  Subsequently, as shown by a two-dot chain line arrow in FIG. 10A, the gas generator 40 is swung toward the side closer to the insertion port with the specific bolt 44 as the swivel center (fulcrum). As shown in FIG. 11, the angle formed with respect to the insertion port of the gas generator 40 becomes smaller as the turning proceeds. At this time, as described above, the specific bolt 44 is positioned in the inner slit 80 and the slit 68, and from both ends of the insertion port in the vehicle width direction from the end portion (front end coupling portion 59) closer to the harness 42. The specific bolt 44 is kept away. Therefore, it is difficult for the gas generator 40 to be caught on the end portion (front end coupling portion 59) near the harness 42 of the insertion port during turning. As a result of the turning, as shown in FIG. 12, the gas generator 40 enters the airbag main body 51 and the front end portion of the inner bag 70 through the insertion port.

  However, the harness 42 connected to the gas generator 40 is pulled out to the outside of the inner bag 70 and the airbag main body 51 through the end portion of the insertion port on the side close to the front end coupling portion 59.

  The gas generator 40 is moved to the harness 42 side (side edge coupling portion 56 side) as shown by a two-dot chain line arrow in FIG. Accordingly, the specific bolt 44 moves from the inner slit 80 and the slit 68 to the specific inner insertion hole 78 and the specific insertion hole 63. When both the general bolts 45 are aligned with the general inner insertion hole 79 and the general insertion hole 64, when the general bolt 45 is inserted into the corresponding general inner insertion hole 79 and the general insertion hole 64, the gas generator 40 is The bag 70 and the airbag body 51 are locked while being positioned.

  Here, from the front ends of the side edge coupling portions 56, 57, front end coupling portions 59, 60 extend toward the side edge coupling portions 57, 56 facing each other. The extension lengths L2 and L1 (see FIG. 5A) affect the airtightness of the airbag body 51. As the extension lengths L2 and L1 become longer, the dimensions of the inner insertion port 77 and the outer insertion port 62 in the vehicle width direction become smaller, and the air tightness of the airbag body 51 becomes higher. On the other hand, if the extension length L2 of the front end coupling portion 59 on the side closer to the harness 42 becomes longer, at least a part of the insertion port is configured when the gas generator 40 is turned around the specific bolt 44 as a turning center. The gas generator 40 and the harness 42 are easily caught at the end portion of the inner insertion port 77 to be engaged. In order to eliminate this, the inner slit 80 and the slit 68 must be lengthened. On the other hand, even if the extension length L1 of the front end coupling portion 60 on the side far from the harness 42 is long, the front end coupling portion 60 is unlikely to hinder the turning of the gas generator 40.

  In this regard, in this embodiment, the inner slit 80 and the slit 68 extend from the specific inner insertion hole 78 and the specific insertion hole 63 that are farthest from the front end coupling portion 59 having the short extension length L2. In other words, the extension length L2 of the front end coupling portion 59 on the side closer to the harness 42 is shorter than the extension length L1 of the front end coupling portion 60 on the far side. Therefore, even if the inner slit 80 and the slit 68 extending from the specific inner insertion hole 78 and the specific insertion hole 63 are short, when the gas generator 40 is turned around the specific bolt 44 as the turning center, the inner insertion hole 77 The gas generator 40 and the harness 42 are not easily caught at the end. Further, since the extension length L1 of the front end coupling portion 60 on the side far from the harness 42 is set to be long, the dimension of the outer insertion port 62 (inner insertion port 77) in the vehicle width direction is reduced, and the airbag body The airtightness of 51 is enhanced and the leakage of the expansion gas is effectively suppressed.

  Further, as described above, in the airbag 50, the inner insertion port 77 of the inner bag 70 and the outer insertion port 62 of the airbag body 51 function as a passage when the gas generator 40 is inserted, and the harness 42 Functions as a passage when the air bag 50 is pulled out of the airbag 50. On the other hand, the inner insertion port 77 and the outer insertion port 62 can serve as a passage for the expansion gas from the gas generator 40.

  Further, the inner slit 80 extending from the specific inner insertion hole 78 and the slit 68 extending from the specific insertion hole 63 can also serve as a passage for the expansion gas. This is because the specific bolt 44 expands in the front-rear direction.

  In this respect, in the present embodiment, the inner flap portion 76 and the flap portion 65 are both folded back downward and covered with the front end portion of the airbag main body 51, whereby the inner insertion port 77, the outer insertion port 62, and the inner slit 80. And the slit 68 is closed. And the inner flap part 76 is hold | maintained in the state covered by the front-end part of the airbag main body 51 by the inner holding | maintenance part. That is, the specific inner locking hole 81 of the inner flap portion 76 that is folded back and rearward and covers the front end portion of the airbag body 51 is locked to the specific bolt 44, and the general inner locking hole 82 is fixed to the general bolt. By being locked by 45, the inner flap portion 76 is held in a state of being covered on the front end portion of the airbag body 51. The inner insertion port 77, the outer insertion port 62, the inner slit 80, and the slit 68 are all closed.

  Further, the flap portion 65 is held by the holding portion in a state of being covered on the front end portion of the airbag main body 51. That is, the specific locking hole 66 of the flap portion 65 that is folded back and rear and covers the front end portion of the airbag body 51 is locked to the specific bolt 44, and the general locking hole 67 is connected to the general bolt 45. By being stopped, the flap portion 65 is held in a state of covering the front end portion of the airbag body 51. The inner insertion port 77, the outer insertion port 62, the inner slit 80, and the slit 68 are all closed.

  At this time, the harness 42 is pulled out of the airbag 50 through the inner insertion port 77 and the outer insertion port 62. Since the harness 42 is flexible, the inner flap 76 and the flap are connected. Deformation occurs as part 65 is folded. It is difficult for the harness 42 to be a hindrance to folding or to damage a highly airtight state.

  Note that the airbag module AM configured by assembling the gas generator 40 to the airbag 50 is fastened to the housing recess 14 of the seat pan 13 with the specific bolt 44 and the two general bolts 45 as described above. The

  By the way, in the airbag apparatus of the present embodiment, when no impact is applied from the front of the vehicle seat S to the front bumper of the vehicle due to a front collision or the like, the control apparatus 92 operates the gas generator 40. Therefore, the expansion gas G is not supplied from the gas generator 40 to the airbag 50. Most of the airbag 50 excluding the front portion is continuously disposed between the seat pan 13 and the seat cushion 11 in a state of being flattened (see FIGS. 1 and 2).

  When an impact is applied to the vehicle from the front of the vehicle seat S due to a frontal collision of the vehicle, the occupant P tries to move forward due to inertia. The passenger P is held on the seat portion 10 by the holding action of the seat belt device 30. However, depending on the posture of the occupant P, the lower back PP may try to move forward.

  On the other hand, when an impact of a predetermined value or more is applied to the front bumper due to the impact from the front, and this is detected by the impact sensor 91, this is detected from the controller 92 to the inflator 41 through the harness 42 based on the detection signal. An operation signal for operating is output. In response to this operation signal, in the inflator 41, as shown in FIG. 13, the expansion gas G starts to be ejected from the gas ejection part 41a. In addition to inflating the inner bag 70, the inflating gas G is discharged from the gas discharge holes 83 and 84 of the inner bag 70 to inflate the airbag body 51.

  And as mentioned above, the seat cushion 11 is pushed up by the airbag 50 inflated between the seat pan 13 and the seat cushion 11, and the seat surface 10a of the seat portion 10 is raised. The region from the back of the knee PN of the occupant P restrained to the vehicle seat S by the seat belt device 30 to the buttocks PB is pressed upward by the raised seat surface 10a. The waist portion PP of the occupant P pushed up by this pressing is pressed against the lap belt portion 34 of the seat belt device 30, and the restraining force of the lap belt portion 34 is increased. A phenomenon in which the waist PP of the occupant P moves forward on the seat 10 is restricted.

According to the embodiment described in detail above, the following effects can be obtained.
(1) Of the plurality of insertion holes, the lower cloth portion 54 of the airbag main body 51 starts from the specific insertion hole 63 farthest from the harness 42 of the gas generator 40 and moves away from the adjacent general insertion hole 64. An extending slit 68 is formed (FIGS. 10A and 10B).

  Therefore, by moving the specific bolt 44 from the specific insertion hole 63 to the slit 68, the specific bolt 44 can be moved away from the end portion (front end coupling portion 59) on the side close to the harness 42 of the insertion port. As a result, it is possible to suppress the gas generator 40 from being caught by the end portion (front end coupling portion 59) on the side close to the harness 42 of the insertion port in the middle of turning around the specific bolt 44. The gas generator 40 can be easily assembled to the front end portion in the airbag body 51 to improve the assembly workability.

  (2) The slit 68 extends from the specific insertion hole 63 farthest from the front end coupling portion 59 having the short extension length L2 out of the pair of front end coupling portions 59, 60 of the peripheral coupling portion 55. (FIG. 10 (a), (b)).

  Therefore, even if the slit 68 is short, it is possible to prevent the gas generator 40 and the harness 42 from being caught at the end of the insertion port when the gas generator 40 is turned around the specific bolt 44 as a turning center.

  Further, since the extension length L1 of the front end coupling portion 60 on the side far from the harness 42 is set to be long, the size of the outer insertion port 62 in the vehicle width direction is reduced, and the air tightness of the airbag body 51 is increased. It is possible to effectively suppress leakage of the expansion gas G.

  (3) A flap portion 65 is formed in front of the outer insertion port 62 of the airbag body 51. A holding portion is further provided to hold the flap portion 65 in a state of being covered with the front end portion of the airbag body 51 so that the outer insertion port 62 and the slit 68 are closed (FIG. 7).

  For this reason, the insertion opening and the slit 68 of the airbag 50 are closed by the flap portion 65 to make the airbag 50 in a highly airtight state, and the leakage of the inflation gas G from the insertion opening and the slit 68 is suppressed. it can.

  (4) The holding portion is provided in all the bolts (specific bolt 44 and both general bolts 45) of the gas generator 40 and the locking portion (specific locking) provided in the flap portion 65 and locked to the bolt. It is comprised by the hole 66 and both general locking holes 67) (FIG. 7).

  Thus, the bolts (specific bolt 44 and both general bolts 45) provided for fastening the gas generator 40 to the seat pan 13 are put in a state where the flap portion 65 is put on the front end portion of the airbag body 51. It is used for holding. Therefore, for this holding, it is not necessary to separately provide a holding portion having a configuration different from that of the bolt and the locking hole. Further, a space for installing the holding portion is not necessary.

  (5) The inner bag 70 is used as a part of the airbag 50. The insertion of the airbag 50 is performed by an outer insertion port 62 formed at the front end of the airbag body 51 and an inner insertion port 77 formed at the front end of the inner bag 70 in a state surrounded by the outer insertion port 62. The mouth is configured.

  The inner bag 70 has an inner slit 80 extending from a specific inner insertion hole 78 farthest from the harness 42 to the side away from the adjacent general inner insertion hole 79 among the plurality of inner insertion holes formed in the inner bag 70. (FIG. 7).

  Therefore, even in the airbag 50 in which the inner bag 70 is used in this way, the end portion of the inner insertion port 77 on the side close to the harness 42 is in the middle of turning around the specific bolt 44 as the turning center. It is possible to suppress catching on (front end coupling portion 59). The gas generator 40 can be easily assembled to the front end portion in the airbag 50 to improve the assembly workability.

  (6) An inner flap portion 76 is formed in front of the inner insertion port 77 of the inner bag 70. There is further provided an inner holding portion for holding the inner flap portion 76 in a state of covering the front end portion of the airbag body 51 so that at least the inner insertion port 77 and the inner slit 80 are closed (FIG. 7). ).

  Therefore, the inner insertion port 77 and the inner slit 80 are closed by the inner flap portion 76, the inner bag 70 is made highly airtight, and the expansion gas G is prevented from leaking from the inner insertion port 77 and the inner slit 80. can do.

  (7) The inner holding portion is provided with all the bolts (specific bolt 44 and both general bolts 45) of the gas generator 40 and the inner flap portion 76, and an inner locking hole ( It is constituted by a specific inner locking hole 81 and both general inner locking holes 82 (FIG. 7).

  In this manner, the bolts (specific bolt 44 and both general bolts 45) provided for fastening the gas generator 40 to the seat pan 13 are covered with the inner flap portion 76 on the front end portion of the airbag body 51. It is used to hold on. Therefore, for this holding, it is not necessary to separately provide an inner holding portion having a configuration different from that of the bolt and the locking hole. Further, a space for installing the inner holding portion is not necessary.

In addition, the said embodiment can also be implemented as a modification which changed this as follows.
One or both of the flap portion 65 and the inner flap portion 76 may be omitted. In the latter case, for example, after the gas generator 40 is disposed in the airbag body 51 and in the inner bag 70, the upper cloth portion 53 and the lower cloth portion 54 of the airbag body 51 are in the vicinity of the outer insertion port 62. The upper inner cloth portion 72 and the lower inner cloth portion 73 of the inner bag 70 may be connected by stitching or the like in the vicinity of the inner insertion port 77. These stitches may be performed with a common thread.

  The number of gas discharge holes 83 and 84 in the inner bag 70 may be changed to 1 or 3 or more. Further, the positions of the gas discharge holes 83 and 84 in the inner bag 70 in the vehicle width direction may be changed to locations other than both end portions. The gas discharge holes 83 and 84 may be provided only in one of the upper inner cloth portion 72 and the lower inner cloth portion 73.

-The airbag main body 51 and the inner bag 70 may be arrange | positioned in the seat part 10 (between the seat cushion 11 and the seat pan 13) in the folded state.
The airbag main body 51 may be substantially entirely constituted by an inflating part, or has a part of a non-inflating part that is not supplied with the inflating gas G and does not inflate. Also good.

  -As shown in FIG. 14, the inner bag 70 may be abbreviate | omitted. In this case, the airbag 50 is configured only by the airbag body 51. Further, the outer insertion port 62 of the airbag body 51 constitutes the insertion port of the airbag 50.

  The slit 68 may extend in a direction inclined with respect to the vehicle width direction on the condition that the slit 68 is on the side away from the adjacent general insertion hole 64. In this case, the extending direction of the inner slit 80 is changed together with the extending direction of the slit 68.

-As the airbag 50, what has a shape different from the said embodiment which makes a rectangular shape by planar view may be used.
-The gas generator 40 may be arrange | positioned in the location different from the said front-end part on the condition that it is a peripheral part in the airbag main body 51. FIG. Applicable locations include the vehicle inner end and the vehicle outer end of the peripheral edge in the airbag body 51. For example, in the former case (the vehicle inner end), the gas generator 40 is disposed at the vehicle inner end in the airbag body 51 in a posture extending in the front-rear direction. Further, the outer insertion port 62 extends in the front-rear direction at the inner end of the airbag 50. The specific insertion hole 63 and the general insertion hole 64 are formed at locations separated from each other in the front-rear direction at the vehicle inner end portion of the lower cloth portion 54. The case where the gas generator 40 is disposed at the latter (the vehicle outer end) is also changed in the same manner as the case where the gas generator 40 is disposed at the vehicle inner end.

  Furthermore, there exists a rear-end part among the peripheral parts in the airbag main body 51 as another applicable location. In this case, the gas generator 40 is disposed at the rear end portion in the airbag main body 51 in a posture extending in the vehicle width direction as in the above embodiment. Further, the outer insertion port 62 extends in the vehicle width direction at the rear end portion of the airbag 50. The specific insertion hole 63 and the general insertion hole 64 are formed at locations separated from each other in the vehicle width direction at the rear end portion of the lower cloth portion 54.

  In the airbag device, the extension length L1 from the side edge coupling portion 57 of the front end coupling portion 60 and the extension length L2 from the side edge coupling portion 56 of the front end coupling portion 59 are the same. The present invention is also applicable to the formed airbag device.

  A thing other than the occupant P, such as a luggage, may be an object to be restrained by the airbag device. Even when the luggage or the like is placed on the seat 10 as a restricted object, the same effect as in the above embodiment can be obtained.

  The above-described airbag device is a vehicle seat that is arranged in the vehicle so that when the occupant P is seated, the airbag device faces a direction different from the front-rear direction of the vehicle, for example, a direction orthogonal to the front-rear direction (vehicle width direction). It is also applicable to S. The airbag apparatus can be applied to any of a plurality of vehicle seats S arranged in the front-rear direction in the vehicle interior.

  The airbag device can be applied to a vehicle seat of a type in which a part of the seat frame is configured by a stretched wire frame portion instead of the seat pan 13 as a support portion.

-Vehicles to which the airbag device is applied include not only private vehicles but also various industrial vehicles.
The above-described airbag device is not limited to a vehicle, and can also be applied to an airbag device equipped on a vehicle seat in other vehicles such as an aircraft and a ship.

  DESCRIPTION OF SYMBOLS 10 ... Seat part, 10a ... Seat surface, 40 ... Gas generator, 42 ... Harness, 44 ... Specific bolt (it comprises each part of a holding part and an inner holding part), 45 ... General bolt (Holding part, Inner holding part) 50 ... airbag, 51 ... airbag body, 53 ... upper cloth part, 54 ... lower cloth part, 55 ... peripheral joint part, 56,57 ... side edge joint part, 59,60 ... Front end coupling portion, 62 ... outer insertion port of airbag body (constituting part of airbag insertion port), 63 ... specific insertion hole, 64 ... general insertion hole, 65 ... flap portion, 66 ... specific locking hole ( 67 ... General locking hole (constituting part of the holding part), 68 ... Slit, 70 ... Inner bag, 76 ... Inner flap part, 77 ... Inner bag inner insertion port (air A part of the bag insertion opening), 78 ... specific inner insertion hole, 79 General inner insertion hole, 80... Inner slit, 81... Specific inner locking hole (constituting a part of the inner holding part), 82. General inner locking hole (constituting a part of the inner holding part), 83, 84. Gas release hole (gas release portion), G ... expansion gas, L1, L2 ... extension length, P ... occupant (constrained object), S ... vehicle seat (vehicle seat).

Claims (8)

An airbag that is disposed in a seat portion of a vehicle seat and whose outer shell portion is configured by an airbag body, and is disposed at a peripheral edge portion in the airbag body, and a harness is connected to one end portion of the airbag. An elongated gas generator, the airbag body is inflated with an inflating gas from the gas generator to raise the seat surface of the seat, and the restrained object on the seat A seat cushion airbag device that restricts forward movement of the vehicle,
In the peripheral portion of the airbag, an insertion port extending along the peripheral portion and having a dimension shorter than the length of the gas generator is formed,
Bolts extending downward from a plurality of locations separated from each other in the length direction of the gas generator correspond to a plurality of insertion holes formed in a peripheral portion of a lower cloth portion constituting a lower portion of the airbag body. And is fastened to the seat,
The harness is pulled out of the airbag body through the insertion port,
A seat cushion airbag device in which a slit extending from the insertion hole farthest from the harness to a side away from an adjacent insertion hole is formed in the lower cloth portion. The peripheral portion in the airbag body includes a front end portion in the airbag body,
The gas generator is arranged at a front end in the airbag body in a posture extending in a width direction of the vehicle seat,
The insertion port extends in the width direction of the vehicle seat at the front end of the airbag,
The seat cushion airbag device according to claim 1, wherein the plurality of insertion holes are formed in a front end portion of the lower cloth portion. In addition to the lower cloth part, the airbag body includes an upper cloth part that constitutes an upper part of the airbag body, a peripheral edge part of the lower cloth part, and a peripheral joint part that connects the peripheral parts of the upper cloth part With
The peripheral edge coupling portion includes a pair of side edge coupling portions extending in the front-rear direction while being separated from each other in the width direction of the vehicle seat, and a pair of side edge coupling portions extending from the front end of each side edge coupling portion to the opposite side edge coupling portion side. A front end coupling portion,
At least a part of the insertion port is configured by an outer insertion port between the lower cloth part and the upper cloth part and sandwiched between both front end coupling parts,
The extension length from the side edge coupling portion of each front end coupling portion is different between the front end coupling portions,
The seat cushion airbag device according to claim 2, wherein the slit extends from an insertion hole farthest from the front end coupling portion having a short extension length. At least a part of the insertion port is configured by an outer insertion port formed at a front end portion of the airbag body,
A flap portion is formed on the front side of the outer insertion port of the airbag body,
The holding | maintenance part which hold | maintains the said flap part in the state covered with the front-end part of the said airbag main body so that the said outer insertion port and the said slit may be block | closed is further provided. Seat cushion airbag device.   The seat cushion airbag device according to claim 4, wherein the holding portion includes all the bolts of the gas generator, and a locking hole provided in the flap portion and locked to the bolt. An inner bag that is disposed in the airbag body in a state of wrapping the gas generator and is provided with a gas discharge portion that discharges the inflation gas from the gas generator to the airbag body. As part of
The insertion port is composed of an outer insertion port formed at the front end portion of the airbag body and an inner insertion port formed at the front end portion of the inner bag in a state surrounded by the outer insertion port. ,
The inner bag has inner insertion holes through which the plurality of bolts are respectively inserted.
The inner bag is formed with an inner slit extending from the inner insertion hole farthest from the harness to the side away from the adjacent inner insertion hole, among the inner insertion holes. The seat cushion airbag device according to claim 1. An inner flap portion is formed on the front side of the inner insertion port of the inner bag,
The inner holding part which hold | maintains the said inner flap part in the state covered with the front-end part of the said airbag main body so that at least the said inner insertion port and the said inner slit may be block | closed is further provided in Claim 6. The seat cushion airbag device described.   The seat cushion airbag according to claim 7, wherein the inner holding portion includes all the bolts of the gas generator and an inner locking hole provided in the inner flap portion and locked to the bolt. apparatus.

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