JP2020050269A - Air bag device - Google Patents

Abstract

To provide an air bag device capable of ensuring high airtightness.SOLUTION: An air bag body 41 is formed by joining (sewing) fabrics together along a joining line 50. The joining line 50 joins the fabric along the joining lines 51, 52 set at least in the vicinity of a pair of intersection sides 48, 49 intersecting one edge side 47 of the air bag body 41, and defines an insertion opening between both ends of the one edge side 47 of the joining lines 51, 52. A folded portion 44 that is folded along a folding line 81 between the end on the one edge side 47 and a gas generator 60 is formed outside the insertion opening of the air bag body 41, and the folded portion 44 includes an extending portion 80 extending in the direction of an axis 82 of the gas generator 60. The folded portion 44 is held in a folded state by the extending joining portion 85 that joins the fabric of the air bag body and the extending portion 80.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an airbag device that protects an occupant by inflating and deploying an airbag when a shock is applied to a vehicle.

  2. Description of the Related Art An airbag device is known as a device that protects an occupant or the like from an impact when the vehicle is impacted by a frontal collision, a side collision, or the like. The airbag module, which is a main part of the airbag device, is incorporated into, for example, a seat of a vehicle seat, a backrest, an interior panel of a vehicle body, and the like. The airbag module includes a gas generator that generates gas in response to an impact applied to a vehicle, and an airbag that is deployed and inflated by gas from the gas generator. The airbag is usually formed by stitching a rectangular fabric folded at a central portion or a plurality of rectangular fabrics overlapped with each other.

  In the above airbag device, a gas generator is assembled in the airbag, and a harness connected to the gas generator is drawn out of the airbag. With such a configuration, it is important to mount the gas generator in the airbag in such a manner that the gas ejected from the gas generator hardly leaks out of the airbag.

  In this regard, for example, in the airbag device described in Patent Literature 1, the gas generator is inserted into the airbag main body through the insertion opening of the airbag main body, and is disposed near the insertion opening. The harness connected to the gas generator is drawn out of the airbag body through the insertion port. In this airbag body, the cross-connection lines of the connection lines connecting the fabrics are respectively along a pair of crossing sides crossing one end of the airbag body. Further, one end side end of each cross connection line extends toward the opposite cross connection line. The end on one end side of one cross connection line and the end on one end side of the other cross connection line are separated from each other, and this point (insertion port) becomes a passage for gas from the gas generator. obtain.

However, a fold line is set between the end of each cross connection line and the gas generator, and the fold line intersects the cross connection line. Therefore, the folded portion formed outside the insertion opening of the airbag body is folded along the fold line, covered with the gas generator, and held in the folded state by the holding means, so that both intersections are formed. The end portion (insertion port) of the connection line is closed, and the airtight state is established. At this time, the harness is drawn out of the airbag main body through the insertion opening, but since the harness has flexibility, it is deformed as the folded portion is folded. The harness does not hinder the folding and does not impair the highly airtight state.
JP 2009-132245 A

  However, in Patent Literature 1, the folded portion formed outside the insertion opening of the airbag body is folded along the folding line, covered with the gas generator, and held in the folded state by the holding means. As a result, the space between the ends (insertion ports) of the two cross connection lines is closed. The holding means is a through hole for the mounting bolt and the folded portion of the gas generator (retainer), and the mounting portion is passed through the through hole to hold the folded portion in a folded state.

  Since the mounting bolt is set on the retainer, the setting position of the mounting bolt can be set only on the retainer. For this reason, the folded portion cannot be held at a portion other than the retainer, and the holding force for closing the end portion (insertion port) cannot be sufficiently secured.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an airbag device that can ensure high airtightness.

  In order to achieve the above object, using a rectangular fabric folded at the center portion or a plurality of rectangular fabrics overlapped with each other, near a pair of intersecting sides intersecting one end side of the fabric Attaching the fabric along at least the set connection line, and an airbag body having an insertion port between both ends on the one end side of the connection line, and put into the airbag body from the insertion port, A gas generator arranged near the insertion opening in the airbag body and for injecting and supplying an inflation gas to the airbag body, wherein the gas generator is provided with a mounting bolt, An insertion hole is provided at a position corresponding to the mounting bolt in the main body, and the mounting bolt is inserted through the insertion hole and protrudes outside the airbag main body. The airbag device is fastened to a vehicle at a position outside the insertion opening of the airbag body, and is folded back along a folding line between the one end side end and the gas generating device. A folded portion is formed, the gas generating device has an elongated outer shape, and is arranged so that an axial direction is along the one end side.The folded portion covers the gas generating device and extends in the axial direction. An extension extending from an end of the gas generator so as to be separated from the gas generator, wherein the mounting bolt side of the airbag body is a first panel, and is opposite to the mounting bolt of the airbag body. An airbag provided with an extension coupling portion that couples the first panel and the extension portion so as to hold the folded portion in a folded state when the side is a second panel. The device.

  According to the above configuration, the gas generator is inserted into the airbag main body through the insertion opening of the airbag main body. In this airbag main body, the cross-connection line of the bonding line for connecting the cloth is formed at one end of the airbag main body. Along a pair of intersecting sides respectively. The end on one end side of one cross connection line and the end on one end side of the other cross connection line are separated from each other, and this point (insertion port) becomes a passage for gas from the gas generator. obtain.

  However, on the outer side of the insertion opening of the airbag body, a folded portion is formed that is folded along a folding line between the end on one end side and the gas generator. The gas generator has an elongated outer shape and is arranged so that the axial direction is along one end. The folded portion has an extending portion that covers the gas generator and extends away from the gas generator from an end of the gas generator in the axial direction. The extension portion has a first connection portion on the mounting bolt side of the airbag body, and a second panel on the opposite side, so that the extension portion has a second connection portion so as to hold the folded portion in a folded state. The one panel and the extending portion are combined, and the airbag main body can be made highly airtight.

  According to a second aspect of the present invention, in the first aspect of the present invention, the mounting bolt and the mounting bolt provided in the folded portion are penetrated so as to hold the folded portion in a folded state. And an airbag device having a through hole.

  According to the above configuration, the mounting bolt is folded back along the folding line and penetrated through the through hole of the folded portion covered by the gas generator. By this penetration, the folded portion is locked by the mounting bolt, and is held in a folded state. In this way, the effect of attaching the airbag body and the gas generator to the vehicle and maintaining the folded portion in the folded state can be further enhanced by the attaching bolt.

  A third aspect of the present invention is the airbag device according to the first or second aspect, wherein the extended connecting portion intersects the pair of connecting lines.

  By intersecting the extension coupling portion with the pair of coupling lines, the extension coupling portion extends between both ends of the pair of coupling lines forming the insertion port, and the effect of holding the folded portion in the folded state is obtained. Can be further enhanced.

  The invention according to claim 4 is the airbag device according to any one of claims 1 to 3, wherein the folded portion is an airbag device disposed between the first panel and the gas generator. .

  According to the above configuration, a part of the gas ejected from the gas generator hits the turn-back portion and changes the flow direction. For example, when the first panel has a relation of being disposed between the turn-back portion and the gas generator, the gas hitting the turn-back portion is similarly changed in the flow direction, but the gas generation of the first panel is performed. There is a concern that gas may flow out of the airbag body through the space between the end on the device side and the folded portion, but by disposing the folded portion between the first panel and the gas generator. , That concern is curbed.

  According to the present invention, the folded portion is formed outside the insertion opening of the airbag body, and the folded portion is folded along the folding line set between the end on one end side of the coupling line and the gas generator. High airtightness can be easily ensured by connecting the extended portion of the folded portion extending in the axial direction of the gas generator with the fabric of the airbag body, while covering the gas generator.

1 is a side sectional view showing a vehicle seat equipped with an airbag device according to an embodiment of the invention. FIG. 2 is an enlarged partial side sectional view showing an X part in FIG. FIG. 1 is a perspective view showing a vehicle seat and a seat belt device. FIG. 3 is a partially enlarged side sectional view showing a state in which the airbag is fastened to an accommodation recess of a seat pan in FIG. FIG. 4 is a bottom view showing the airbag module before the folded portions of the airbag body and the inner bag are folded. FIG. 6 is a bottom view of the airbag module in which both folded portions of the airbag and the inner bag are folded. The bottom view of each component (airbag main body, inner bag, and gas generator) of an airbag module. The development view of each base cloth used for an airbag main body and an inner bag, and a side view of a gas generator. FIG. 4 is a partial cross-sectional side view showing a state in which the inner bag and the airbag body are inflated and the seat surface of the seat is raised in the vehicle seat. It is a figure which shows another Example of an airbag module, and is a bottom view corresponding to said FIG. FIG. 7 is a bottom view corresponding to FIG. 6. The figure which shows another Example in the XII-XII line of FIG. FIG. 2 is a development view showing an embodiment of an airbag body to which a reinforcing cloth is applied.

  Hereinafter, an embodiment in which the present invention is embodied in an airbag device that restricts the forward movement of the occupant's waist (submarine phenomenon) by raising the seat surface of a vehicle seat with an airbag. This will be described with reference to the drawings. In the following description, the forward direction of the vehicle is described as forward, and front, rear, up, down, left, and right are defined based on the forward direction. In each figure, “front” indicates the front side of the vehicle, “rear” indicates the rear side of the vehicle, “inside” indicates the inside of the vehicle, and “outside” indicates the outside of the vehicle.

  First, a schematic configuration of a vehicle seat to which the airbag device of the present embodiment is applied will be described. As shown in at least one of FIGS. 1 and 3, the vehicle seat S includes a seat portion (seat cushion) 10 and a backrest portion (seat back) 21 which is disposed at the rear end side of the seat portion 10 so as to be adjustable in inclination. And a headrest 22 arranged above the backrest 21.

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

  The vehicle is equipped with a seat belt device 30 for restraining an occupant P sitting on a vehicle seat S. The seat belt device 30 includes a belt-shaped webbing 31 for restraining the occupant P, a tongue 32 movably attached to the webbing 31 in the longitudinal direction thereof, and a tongue 32 disposed on one side of the seat 10. And a buckle 33 that is detachably attached. One end of the webbing 31 is fixed to the side of the seat 10 where the buckle 33 is not provided, and the other end is wound up by a belt winding device (not shown). In the seat belt device 30, the length of each of the lap belt portion 34 and the shoulder belt portion 35 can be adjusted by sliding the tongue 32 with respect to the webbing 31.

  The lap belt portion 34 is a portion of the webbing 31 from the tongue 32 to the end of the webbing 31 and, as described above, passes from one side of the waist Pp of the seated occupant P in front of the waist Pp in the horizontal direction. It is a part that is bridged to the other side and mainly restrains the waist Pp. The shoulder belt portion 35 is a portion from the tongue 32 to the belt winding device in the webbing 31, and as described above, the shoulder Ps of the seated occupant P diagonally passes through the front of the chest Pt to the waist Pp. It is a part which is bridged sideways and mainly restrains the shoulder Ps of the occupant P.

  The vehicle is further equipped with an airbag device for suppressing the submarine phenomenon. The submarine phenomenon is such that when an impact is applied to the vehicle from the front due to a front collision or the like, the waist Pp of the occupant P restrained by the vehicle seat S by the seat belt device 30 is disengaged from the lap belt portion 34 and forward. It is a phenomenon that moves to.

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 an airbag 40 and a gas generator 60. Next, each component of the airbag module AM will be described.

<Configuration of the airbag 40>
The airbag 40 includes an airbag body 41 that forms an outer shell portion thereof and that protrudes the seating surface 10A of the seating portion 10 by inflation. As shown in at least one of FIGS. 7 and 8, most of the airbag body 41 is formed of a single, substantially rectangular cloth (hereinafter, referred to as a “base cloth 42”) that is elongated in the front-rear direction. The base cloth 42 is formed of a woven cloth made of polyester yarn, polyamide yarn, or the like, and has high strength and flexibility. At one end (front end) of the base cloth 42, a folded portion 44 that protrudes forward is integrally formed. The location where the folded portion 44 is provided is outside (front side) of an insertion port 53 of the airbag 40 described later. Due to the folded portion 44, the shape of the base cloth 42 is asymmetric in the front-back direction.

  At the rear end of the base cloth 42, a plurality of places (three places in this embodiment) that are separated from each other in the vehicle width direction are provided with insertion holes 45 through which mounting bolts 68 of a retainer 66 described later pass. I have. In the folded portion 44 of the expanded base cloth 42, a through hole 46 for penetrating the mounting bolt 68 is also formed at a position overlapping the insertion hole 45 when the folded portion 44 is folded. .

  The base fabric 42 is set at a central portion in the length direction, is folded along a folding line 43 extending in the vehicle width direction, and is overlapped in the vertical direction. In FIG. 8, the portion of the base cloth 42 behind the fold line 43 is located below when it is overlapped, and the front side is located above when it is overlapped. In FIG. 8, the rear edge of the base cloth 42 behind the folding line 43 corresponds to one end 47. The one end side 47 is located at the front end of the lower portion in a state where the base cloth 42 is folded back and overlapped in the vertical direction (FIG. 7).

  The base cloth 42 folded as described above is connected along a connection line 50 (see a thick broken line in FIG. 7) set near the other end except the one end 47. By this connection, the airbag main body 41 is formed into a bag shape, and has the insertion port 53 between the ends 51A and 52A on the one end side 47 side of the connection line 50. Examples of the mode of connection along the connection line 50 include suturing using a suture, bonding using an adhesive, welding, and the like. Here, the base cloth 42 is sewn with the suture. In the present embodiment, since a single piece of cloth is used as the base cloth 42 and the cloth is folded back, the bonding (stitching) of the cloth along the folding line 43 near the folding line 43 can be omitted. It is.

  The connection line 50 includes at least a pair of cross connection lines 51, 52 set along a pair of cross sides 48, 49 intersecting the one end side 47 of the airbag body 41. The pair of cross connection lines 51 and 52 extend in the front-rear direction while being separated from each other in the vehicle width direction. The ends on the one end side 47 side of the cross connection lines 51, 52 are curved and extend toward the opposing cross connection lines 52, 51 side. In the airbag main body 41 connected along the connection line 50, a portion surrounded by the connection line 50 is a portion inflated by the inflation gas G.

  As shown in FIG. 9, the airbag body 41 includes a rear inflatable portion 41B that inflates near the lower part of the thigh Pf of the occupant P and a lower part of the knee Pn of the occupant P, as shown in FIG. It has a configuration including a front expansion section 41A that expands to a position higher than the rear expansion section 41B in the vicinity.

<Configuration of inner bag 71>
As shown in at least one of FIGS. 7 and 8, the airbag 40 includes an inner bag 71 in addition to the airbag body 41 described above.

  The inner bag 71 encloses the gas generator 60 in the airbag body 41 (the front inflatable portion 41A). Most of the inner bag 71 is formed of one piece of cloth having a substantially rectangular shape (hereinafter, referred to as “base cloth 72”). The base cloth 72 is formed of a woven cloth made of the same material as the airbag 40, and has high strength and flexibility. At one end (front end) of the base cloth 72, a folded portion 73 protruding forward is integrally formed. The folded portion 73 has substantially the same shape and size as the folded portion 44. The location where the folded portion 73 is provided is outside (front side) of an insertion opening 78 (see FIG. 5) of the inner bag 71 described later. Due to the folded portion 73, the shape of the base cloth 72 is asymmetric in the front-back direction.

  At the rear end of the base cloth 72, at a plurality of places (three places) separated from each other in the vehicle width direction, insertion holes 74 for passing the mounting bolts 68 of the retainer 66 are formed. Further, through holes 75 through which the mounting bolts 68 can pass are formed at a plurality of positions (three positions) of the folded portion 73 separated from each other in the vehicle width direction. The space between adjacent insertion holes 74 and the space between adjacent through holes 75 are the same as the space between adjacent mounting bolts 68.

  The base cloth 72 is set at a central portion in the length direction, is folded along a folding line 76 extending in the vehicle width direction, and is overlapped in the vertical direction. In FIG. 8, the portion of the base cloth 72 behind the fold line 76 is located below when it is overlapped, and the front portion is located above when it is overlapped.

  The base fabric 72 folded as described above is connected along a pair of connection lines 77 (see a thick broken line in FIG. 7) set on both sides in the vehicle width direction. With this connection, a bag-shaped inner bag 71 is formed. Examples of the mode of joining along the joining line 77 include suturing using a suture, bonding using an adhesive, welding, and the like. Here, the base cloth 72 is sewn with the suture. In addition, the path between the front ends of the two connection lines 77 is a passage for taking the gas generator 60 in and out, but cannot be said to be the insertion port 78 in a strict sense. This is because the ends 51A and 52A of the cross connection lines 51 and 52 in the airbag main body 41 described above enter more inward than the front ends of the two connection lines 77. Therefore, the insertion port 78 of the inner bag 71 is the same as the insertion port 53 of the airbag body 41 (see FIG. 5).

  In the vicinity of both ends in the vehicle width direction of the inner bag 71, the inside and outside of the inner bag 71 are communicated, and the inflation gas G ejected from the gas ejection holes 62 of the inflator 61 is discharged substantially upward. A pair of discharge holes 79 are provided. These release holes 79 are located between the fold line 76 and the through hole 75 in the base fabric 72 in the unfolded state (see FIG. 8). The two discharge holes 79 are located on the upper side of the base cloth 72 folded up and down.

<Mounting mode of inner bag 71>
As shown in at least one of FIGS. 5 and 7, the inner bag 71 has its insertion hole 74 aligned with the insertion hole 45 of the airbag main body 41 and its through hole 75 aligned with the through hole 46 of the airbag main body 41. The airbag body 41 is disposed at the front end of the airbag body 41 in a state where the airbag body is in a folded state. Most of the inner bag 71 except for the folded portion 73 is located inside the airbag body 41. The inner bag 71 is joined (co-sewing) together with the airbag body 41 at the ends 51A, 52A of the two cross connection lines 51, 52 of the airbag body 41. Thus, the inner bag 71 is attached to the airbag main body 41.

<Configuration of gas generator 60>
As shown in at least one of FIGS. 7 and 8, the gas generator 60 is for supplying an inflation gas G as an inflation fluid to the airbag 40, and includes an inflator 61 as an inflation fluid generation source; And a retainer 66 attached to the outside of the inflator 61. Here, a so-called pyro type is used as the inflator 61. The inflator 61 has a substantially columnar shape, and contains a gas generating agent (not shown) that generates an inflation gas G by a chemical reaction involving heat generation. At one end of the inflator 61, a plurality of gas ejection holes 62 are provided, and a gas discharge portion 63 that ejects the inflation gas G generated by the gas generating agent from the gas ejection holes 62 is provided. . At the other end of the inflator 61, a connection portion (connector portion) 65 for a harness 64 is provided. The harness 64 serves as a wiring for applying a control signal to the inflator 61.

  In addition, as the inflator 61, a type different from the above-mentioned pyro type may be used. Examples of such a type include a stored gas type in which a partition of a high-pressure gas cylinder filled with a high-pressure gas is broken by explosive or the like to eject an inflation gas, and a hybrid type in which both a pyro type and a stored gas type are combined. No.

  On the other hand, most of the retainer 66 is formed in a slender, substantially cylindrical shape by bending a plate material such as a metal plate. A window 67 is formed in a part of the retainer 66 to expose a part of the many gas ejection holes 62. At the lower surface of the retainer 66, mounting bolts 68 extending outward in the radial direction are implanted at a plurality of positions (three positions in the present embodiment) separated from each other in the length direction. The inflator 61 may have a configuration provided integrally with the retainer 66.

  The gas generator 60 having the above-described configuration is configured to extend in the vehicle width direction in the inner bag 71, that is, in the vicinity of the insertion port 53 in the airbag main body 41. And the connection portion 65 is arranged in a posture in which the connection portion 65 is located on the cross coupling line 51 side. A plurality of mounting bolts 68 of the retainer 66 are inserted into the corresponding insertion holes 45 and 74 and the through holes 46 and 75. The mounting bolt 68 and the through holes 46 and 75 of the folded portions 44 and 73 constitute holding means for holding the folded portions 44 and 73 in a folded state.

<Aspects of Ends 51A, 52A of Cross-Coupling Lines 51, 52>
As described above, the ends 51A and 52A of the cross connection lines 51 and 52 on the one end side 47 side are curved and extend toward the opposing cross connection lines 52 and 51. As shown in FIG. 5, the extension length of the end portion 52A at the cross connection line 52 on the gas discharge portion 63 side is L1, and the extension length of the end portion 51A at the cross connection line 51 on the connection portion 65 side is L2. Then, in the present embodiment, the extension lengths L1 and L2 are set so that the relationship of L1> L2 is satisfied.

Further, the extending end 51 </ b> B of the cross connection line 51 is set to be located between the crossing side 48 of the gas generator 60 near the connection portion 65 and the connection portion 65.
<Mounting mode of gas generator 60>
When attaching the gas generator 60 to the airbag 40, as shown in at least one of FIGS. 5 to 7, the insertion port 53 of the airbag body 41 and the insertion port 78 of the inner bag 71 are both opened. The direction of the gas generator 60 is adjusted so that the gas discharge portion 63 is located on the cross-connection line 52 side and the connection portion 65 is located on the cross-connection line 51 side. The gas generator 60 is inserted into the inner bag 71 (inside the airbag body 41) from the opened insertion ports 53 and 78 described above. The posture of the gas generator 60 is adjusted so that the gas generator 60 extends in the vehicle width direction near the insertion ports 53 and 78.

  At this time, unlike the above-described Patent Document 1, the vicinity of the insertion ports 53 and 78 is exposed without being blocked by another member (such as a patch cloth) and can be seen from the outside. Therefore, the work of inserting the gas generator 60 from the insertion ports 53 and 78 and the work of arranging the gas generator 60 near the insertion ports 53 and 78 in the inner bag 71 (airbag body 41) can be easily performed. .

  The plurality of mounting bolts 68 of the retainer 66 are inserted into the through-holes 74 of the inner bag 71 and the through-holes 45 of the airbag body 41, corresponding to the mounting bolts 68. By this insertion, the gas generator 60 is locked to the airbag 40 (the inner bag 71 and the airbag body 41) by the plurality of mounting bolts 68.

  In this state, the ends 51A, 52A of the cross connection lines 51, 52 on the one end side 47 side extend toward the opposing cross connection lines 52, 51. The extension end 51 </ b> B of the cross connection line 51 is located closer to the cross side 48 than the connection portion 65 of the inflator 61. On the other hand, the gas discharge portion 63 of the inflator 61 is located closer to the intersection side 49 than the extending end 52B of the cross connection line 52.

  The harness 64 of the gas generator 60 is drawn out of the airbag 40 from the insertion ports 53 and 78 through the vicinity of the extending end 51B of the cross connection line 51. At this time, it is desirable that the harness 64 is drawn out so as to pass through one of the short sides 44A and 73A (closer to the intersection side 48) of the folded portions 44 and 73.

  Here, it has been described above that the end 51A (52A) of the cross connection line 51 (52) on the one end side 47 side extends to the opposite cross connection line 51 (52) side. The extension lengths L1 and L2 affect the airtightness of the airbag body 41. The longer the extension lengths L1 and L2, the higher the airtightness. On the other hand, as the extension lengths L1 and L2 become longer, it becomes more difficult to pull out the harness 64 from the inside of the airbag body 41 to the outside.

  In this regard, in the present embodiment, since the extension lengths L1 and L2 of the end portions 51A and 52A are different between the gas discharge portion 63 side and the connection portion 65 side of the gas generator 60, both the above problems are solved. Is done. That is, since the extension length L1 on the gas release portion 63 side is set long, the airtightness is improved. In addition, since the extension length L2 on the connection portion 65 side is set short, the harness 64 can be easily pulled out of the airbag body 41.

  In particular, in the present embodiment, the extension end 51B of the cross-coupling line 51 on the connection portion 65 side is located between the intersection side 48 near the connection portion 65 and the connection portion 65. Accordingly, the extension length L2 of the end portion 51A of the cross connection line 51 becomes appropriate, and the harness 64 can be pulled out of the airbag body 41 without significantly bending the harness 64.

  As described above, in the airbag 40, the insertion port 78 of the inner bag 71 and the insertion port 53 of the airbag body 41 function as a passage for inserting the gas generator 60, and the harness 64 is connected to the airbag 40. It functions as a passage when it is pulled out. On the other hand, these insertion ports 53 and 78 can also serve as passages for inflation gas from the gas generator 60.

  Therefore, in the present embodiment, the folding line 81 is set between the ends 51A and 52A of the cross connection lines 51 and 52 and the gas generator 60 in the airbag 40. At this set point, the folding line 76 intersects any of the cross connection lines 51 and 52. The folded portion 44 formed outside the insertion opening 53 of the airbag body 41 and the folded portion 73 formed outside the insertion opening 78 of the inner bag 71 are folded along the folding line 81. As a result of this folding, the space between the ends 51A and 52A of the two cross connection lines 51 and 52 (the insertion ports 53 and 78) is closed.

  Then, the two folded portions 44 and 73 are put on the outer peripheral surface of the gas generator 60 from the lower front. 4 and 6, the plurality of through-holes 46, 75 of the folded portions 44, 73 are located below the gas generator 60, more precisely, the corresponding mounting bolts 68. Located below. The mounting bolts 68 corresponding to these through holes 46 and 75 are made to penetrate. Due to this penetration, the two folded portions 44 and 73 are locked by the mounting bolts 68, and the two folded portions 44 and 73 are folded along the folding line 76 and held in a state of being covered by the gas generator 60. Due to this holding, the space between the ends 51A and 52A of the two cross connection lines 51 and 52 (the insertion ports 53 and 78) is closed, and a state of high airtightness is obtained. At this time, the harness 64 is drawn out of the airbag 40 through the insertion ports 53 and 78, but since the harness 64 is flexible, the harness 64 accompanies the folding of the folded portions 44 and 73. Deform. The harness 64 does not hinder the folding and does not impair a highly airtight state. Further, the connection (stitching) of the base cloths 42, 72 along the connection lines 50, 77 is performed at a timing before the gas generator 60 is inserted and arranged in the airbag 40. The harness 64 is not damaged by (suturing). Further, the gas generator 60 has a long external shape, and is arranged so that the direction of the axis 82 is along the one end 47 of the airbag body 41. The folded portion 44 covers at least a part of the gas generator 60 and includes extending portions 80 extending from both ends of the gas generator 60 in the direction of the axis 82 of the gas generator 60. When the gas generating device 60 is assembled to the airbag body 41, the fabric of the airbag body 41 on the mounting bolt 68 side is a first panel 83, and the fabric of the airbag body 41 on the opposite side to the mounting bolt 68 is the second panel 83. When the panel 84 is used, an extension connecting portion 85 for connecting the extending portion 80 and the first panel 83 by sewing is provided. The extension connecting portion 85 extends in parallel in the direction of the axis 82 of the gas generator 60, and has one end crossing the intersection sides 48 and 49, and the other end separated from the end of the gas generator 60. Position. The harness 64 is drawn out of the airbag body 41 from between the extension connecting portion 85 and the folding line 81. The extension coupling portion 85 shown in FIG. 6 has two, one on each of the left and right sides, a total of four, but the number and length thereof can be freely changed. The extension portion 85 holds the folded portion 44 in a folded state.

  The airbag module AM is manufactured by mounting the gas generator 60 in the airbag 40 as described above. The airbag module AM is arranged and assembled in the seat 10 of the vehicle seat S in the following manner.

<Arrangement of airbag module AM>
As shown in at least one of FIGS. 2 and 4, the airbag module AM is arranged in the seat 10 with the folded portions 44 and 73 positioned on the lower side. The front portion of the airbag 40 where the gas generator 60 is disposed is housed in the housing recess 14 of the seat pan 13. In the airbag 40, portions other than the front portion are deployed below the seating surface 10 </ b> A in the seating portion 10, more specifically, with the seat cushion 11 in a state where the portion is deployed without being filled with the inflation gas G. It is arranged between the seat pan 13. The rear end portion 41R of the airbag body 41 in the deployed state is located below the boundary between the thigh portion Pf and the buttocks Pb of the occupant P seated on the seat portion 10.

<Assembling mode of airbag module AM>
The plurality of mounting bolts 68 that are inserted through the insertion holes 74 and the through holes 75 of the inner bag 71 and the insertion holes 45 and the through holes 46 of the airbag body 41 and protrude outside the airbag 40 are accommodated in the housing recesses. 14 is inserted through a through hole 16 formed in the bottom 15. The nut 69 is screwed into each of the mounting bolts 68, so that the gas generator 60 is fastened to the housing recess 14 together with the airbag 40. By this fastening, the front part of the airbag 40 is pressed against the bottom part 15 of the accommodation recess 14, and the insertion ports 53 and 78 are securely closed. At this time, the mounting bolt 68 and the nut 69 serve to attach the airbag body 41, the inner bag 71 and the gas generator 60 to the vehicle (the accommodation recess 14 of the seat pan 13), and the both folded portions 44 and 73 are folded. And hold the role of holding.

  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, and detects an impact applied to the front bumper or the like from the front to detect a front collision of the vehicle. The control device 92 controls the operation of the inflator 61 based on the detection signal from the impact sensor 91 as follows.

  When a shock equal to or greater than a predetermined value is applied to the front bumper due to a frontal collision (front collision) of the vehicle and the like, which is detected by the shock sensor 91, the drive current is sent from the control device 92 to the harness 64 based on the detection signal. Is output to the inflator 61 through By the heating based on the driving current, the gas generating agent in the inflator 61 is ignited to generate a high temperature and high pressure inflation gas G. A high-pressure inflation gas is released from the gas release section 63 of the inflator 61.

  The inflation gas G inflates the inner bag 71 and is discharged from the discharge holes 79 of the inner bag 71 to inflate the airbag body 41. Accordingly, the relationship between the amount of the inflation gas G ejected from the inflator 61 (hereinafter, referred to as “ejection amount Q1”) and the amount of the inflation gas G ejected from the ejection holes 79 (hereinafter, referred to as “emission amount Q2”). Accordingly, the inflation mode of the inner bag 71 and the airbag body 41 is different.

  The ejection amount Q1 generally increases with the passage of time from the start of ejection. After the injection amount Q1 reaches the maximum, it changes from an increase to a decrease, and decreases with time. In consideration of the fact that the inflation gas G is ejected from the inflator 61 with such ejection characteristics, in the present embodiment, by appropriately setting the relationship between the ejection amount Q1 and the emission amount Q2, the front inflation portion 41A is formed. Is inflated to a position higher than the rear inflatable portion 41B.

  Here, the period during which the inflation gas G is ejected from the inflator 61 is divided into the following three (periods I to III) from the viewpoint of the ejection amount Q1 and the emission amount Q2. Is operated as follows, and the front inflatable portion 41A is inflated to a position higher than the rear inflatable portion 41B.

<Period I after the start of inflation of the inflation gas G, the amount of ejection Q1 is smaller than the amount of emission Q2>
When the high-pressure inflation gas G starts to be ejected from the inflator 61, the inflation gas G is first supplied to the inner bag 71 enclosing the inflator 61 as shown in at least one of FIGS. The inflation gas G causes the inner bag 71 to start inflating, and accordingly, the airbag body 41 outside the inner bag 71, particularly the front inflation portion 41A in which the inflator 61 and the inner bag 71 are arranged, is indirectly inflated. . During this inflation, since the airbag body 41 is arranged between the seat cushion 11 and the seat pan 13 made of a steel plate having higher rigidity, the airbag body 41 is exclusively inflated without inflating downward. Inflates upward.

  In the period I, most of the inflation gas G from the inflator 61 starts to be discharged substantially upward in the front inflation portion 41A through the discharge hole 79 before the inner bag 71 is completely inflated. This inflation gas G causes the front inflation portion 41A to inflate to a high pressure, so that the lower part of the knee Pn of the occupant P is first raised on the seating surface 10A as shown in FIG. The ridge raises the knee Pn of the occupant P. Further, due to the expansion of the front inflatable portion 41A, a gap is generated between the outer surface of the inner bag 71 and the inner surface of the front inflatable portion 41A.

  The inflation gas G flows toward the rear of the vehicle through the gap after the front inflation portion 41A has been inflated to some extent to raise the seating surface 10A. The inflation gas G causes the rear inflation portion 41B to inflate, and the internal pressure of the entire airbag body 41 tends to gradually become uniform.

  As the front inflatable portion 41A and the rear inflatable portion 41B expand, the seat surface 10A protrudes in order from the front side to the rear side as described above. Due to this protuberance, the region from the knee Pn of the occupant P seated on the seat 10 to the rear end of the thigh Pf (in front of the buttocks Pb) is pressed upward in the above order. By this pressing, the area of the occupant P is pushed up in the above order, and the waist Pp of the occupant P is pressed against the lap belt portion 34 of the seat belt device 30. By this pressing, the restraining force of the lap belt portion 34 is increased, and the forward movement of the waist Pp is restricted.

  In addition, the front inflatable portion 41A is inflated to a position higher than the rear inflatable portion 41B, and the seating surface 10A is raised higher at the front portion than at other portions. Therefore, the knee Pn of the occupant P is pushed up to a position higher than the thigh Pf, and the forward movement of the waist Pp is further restricted. As a result, the forward movement of the waist Pp, that is, the occurrence of the submarine phenomenon, is more reliably suppressed than when the occupant simply pushes up the thigh by the inflation of the airbag.

<Period II after the period I, the ejection amount Q1 becomes equal to or more than the emission amount Q2>
In the period II, the inflation gas G is discharged upward from the discharge hole 79 with a vigorous force. For this reason, in the period I, as described above, the internal pressure of the airbag body 41 was about to be uniform, but the upper part of the front inflatable portion 41A in the airbag body 41 was intensively inflated, and Become. As a result, the lower part of the knee Pn of the occupant P is raised further higher on the seat surface 10A, the knee Pn of the occupant P is pushed up to a higher position, and the forward movement of the waist Pp is reliably restricted.

<Period III in which the jet amount Q1 becomes smaller than the discharge amount Q2 again after the period II>
In the period III, the momentum of the release of the inflation gas G from the discharge holes 79 is reduced. For this reason, the internal pressure of the airbag body 41 tends to be uniform again.

It is considered that the front inflatable portion 41A expands to a position higher than the rear inflatable portion 41B after the above periods I to III.
As shown in at least one of FIGS. 5 and 6, in the airbag module AM, the folded portions 44 and 73 formed outside the insertion ports 53 and 78 are formed at the ends of the cross connection lines 51 and 52. It is folded back along the folding line 43 set between 51A, 52A and the gas generator 60, and the space between both ends 51A, 52A (insertion ports 53, 78) is closed. Due to this blockage, the airbag body 41 is in a state of high airtightness. Therefore, when the airbag body 41 is inflated, the inflation gas G does not easily leak out of the airbag body 41 through the insertion ports 53 and 78.

  Here, if the airbag main body 41 is arranged in the seat 10 in a folded state before inflation, the folded portion becomes a resistance of deployment and inflation, and energy of the inflation fluid is consumed to cancel the folding. You. In this regard, in the present embodiment, the airbag body 41 is not folded, but is arranged in a state of being deployed in advance. For this reason, there are fewer elements that are resistant to deployment and inflation than in the case of being folded, and the airbag body 41 (the front inflation portion 41A and the rear inflation portion 41B) inflates faster.

  In addition, a load generated by the load of the occupant P acts on the airbag body 41 that inflates as described above, and the load is in a wide area from the knee Pn of the occupant P to the rear end of the thigh Pf. It is accepted by. For this reason, the impact generated due to the inflation of the airbag body 41 is dispersed and acts on the occupant P, and does not act on a specific portion.

According to the embodiment described above, the following effects can be obtained.
(1) The ends 51A, 52A on the one end side 47 side of each of the pair of cross-connection lines 51, 52 extend toward the opposing cross-connection lines 52, 51 (see FIGS. 5 and 6). A folded portion 44 is formed outside the insertion opening 53 of the airbag body 41, and the folded portion 44 is folded along a folding line 81 between each end 51A, 52A and the gas generating device 60 to form the gas generating device 60. And hold it in that state.

  By adopting such a configuration, the gas generator 60 can be easily inserted into the airbag body 41 (the inner bag 71) through the insertion ports 53 and 78 which are not closed by other members and are exposed, and have a predetermined posture. Can be easily arranged.

  In addition, by folding back the folded portions 44 and 73 along the folding line 81, the insertion ports 53 and 78 between the ends 51A and 52A of the two cross connection lines 51 and 52 are closed, and the airbag body 41 is airtight. Can be high. Leakage of the inflation gas G from the insertion ports 53 and 78 can be suppressed.

  Further, when the insertion ports 53 and 78 are closed, the cloths (base cloths 42 and 72) along the bonding lines 50 and 77 are connected (sewn) to the airbag body 41 and the inner bag 71 of the gas generator 60. Performed before insertion / placement. In other words, after the gas generator 60 is inserted and arranged and the harness 64 is pulled out, the fabrics (base fabrics 42 and 72) are not connected (sewn). Therefore, the harness 64 is not damaged by a needle or the like involved in the suturing at the time of the connection (suturing).

  (2) The extension length L1 of the end portion 52A on the gas release portion 63 side of the gas generator 60 is set to be longer than the extension length L2 of the end portion 51A on the connection portion 65 side (see FIG. 5). ). Therefore, the gas tightness can be further enhanced to effectively suppress gas leakage, and the harness 64 can be easily pulled out of the airbag body 41 and the inner bag 71.

  (3) The extension end 51B of the cross connection line 51 on the connection portion 65 side is located between the intersection side 48 on the side close to the connection portion 65 and the connection portion 65 (see FIG. 5). For this reason, the extension length L2 of the end portion 51A of the cross connection line 51 becomes appropriate, and the harness 64 can be easily pulled out to the outside of the airbag body 41 without greatly bending the harness 64, and high airtightness is secured. can do.

  (4) By using the mounting bolt 68 of the gas generator 60 and the through holes 46 and 75 of the folded portions 44 and 73 as holding means, and passing the mounting bolt 68 through the through holes 46 and 75, the folded portions 44 and 73 are formed. It is kept in a folded state. Therefore, it is not necessary to separately provide a mechanism different from the above in order to hold the folded portions 44 and 73 in the folded state. Also, no space is required for installing the mechanism.

(5) The base cloth 42 along the ends 51A, 52A on the one end 47 side of the two cross connection lines 51, 52.
The inner bag 71 is joined to the airbag main body 41 by joining (sewing) of (cloth). As described above, the inner bag 71 can be joined to the airbag body 41 together by using the joining (stitching) of the base cloth 42 for manufacturing the airbag body 41. Apart from joining (stitching) the base cloth 42, the joining (stitching) of the base cloth 42 and the joining of the inner bag 71 are performed with a smaller number of joining (stitching) as compared with the case of joining (stitching) the inner bag 71 to the airbag body 41. Bonding to the base cloth 42 can be performed.

  FIG. 10 and FIGS. 11 and 12 show another embodiment. The same parts and members as in the above embodiment are denoted by the same reference numerals. In this case, the gas generator 60 has an elongated outer shape, and is arranged so that the direction of the axis 82 is along the one end side 47 of the airbag body 41. The folded portion 44 covers at least a part of the gas generator 60, and extends from both ends of the gas generator 60 to the pair of intersection sides 48, 49 of the airbag body 41 in the direction of the axis 82 of the gas generator 60. An extension 80 is provided. When the gas generating device 60 is assembled to the airbag body 41, the fabric of the airbag body 41 on the mounting bolt 68 side is a first panel 83, and the fabric of the airbag body 41 on the opposite side to the mounting bolt 68 is the second panel 83. When the panel 84 is used, an extension connecting portion 85 for connecting the extending portion 80 and the first panel 83 by sewing is provided. The extension connecting portion 85 extends in parallel in the direction of the axis 82 of the gas generator 60, and has one end crossing the intersection sides 48 and 49, and the other end separated from the end of the gas generator 60. Position. The harness 64 is drawn out from the space between the other end and the gas generator 60 to the outside of the airbag body 41. In the extension connecting portion 85 shown in FIG. 11, two are provided on each of the left and right sides, that is, four in total, but the number and length thereof can be freely changed. The extension portion 85 holds the folded portion 44 in a folded state.

  Further, similarly to the above-described embodiment, the mounting bolt 68 and the through-hole 46 through which the mounting bolt 68 provided in the folded portion 44 is provided, and the folded portion 44 is locked by the mounting bolt 68 by this penetration. It is kept in a folded state.

  Further, as shown in FIG. 12, the folded portion 44 may be disposed between the first panel 83 and the gas generator 60. In FIG. 12, the nut 68 is omitted. Further, the extension connecting portion 85 may connect the extending portion 80, the first panel 83, and the second panel 84.

(B) Instead of using the mounting bolt 68, the folded portions 44 and 73 may be held in a folded state by a separate mechanism.
(C) In the above-described embodiment, the folded portions 44 and 73 are arranged between the gas generator 60 and the bottom 15 of the housing recess 14, and are firmly clamped by fastening the mounting bolt 68. By this pinching, the folded portions 44 and 73 are held in a folded state. This effect can be obtained without inserting the mounting bolt 68 into the through holes 46 and 75. Therefore, the through holes 46 and 75 may be omitted, and the holding means may be constituted by the mounting bolt 68 and the nut 69.

  (D) In order to increase the strength near the insertion hole 45 in the airbag body 41, as shown in FIG. As the reinforcing cloth 82, one having an insertion hole 83 through which the mounting bolt 68 can be inserted at a position corresponding to the insertion hole 45 of the airbag body 41 is used. The reinforcing cloth 82 may be connected to the airbag body 41 by means such as stitching along a connecting line 84 set around the insertion hole 83 or the like.

  (E) The airbag body 41 folds a plurality of cloths vertically stacked along a common fold line set at the center thereof, and vertically lays them up, and stitches them along the joining line 50. It may be formed by doing so. As the number of cloths used increases, the strength of the airbag body 41 increases.

  In this case, a plurality of cloths may be joined along an auxiliary joining line 85 set at a location different from the joining line 50 described above. For example, as shown by a thick broken line in FIG. 13, an auxiliary coupling line 85 may be set in the folded portion 44, and the plurality of folded portions 44 may be coupled to each other along the auxiliary coupled line 85.

  (F) The airbag body 41 may be formed by joining (sewing) a plurality of fabrics stacked in the vertical direction along the joining line 50. The difference from the above embodiment is that the fabric is not folded at the center.

  In this case, the joining line 50 is set near three sides except one end side 47 of the cloth. The three sides include the pair of cross connection lines 51 and 52 in the above embodiment. (G) The number of the discharge holes 79 in the inner bag 71 may be changed to one or three or more. Further, the position of the discharge hole 79 in the inner bag 71 in the vehicle width direction may be changed to a position other than both ends.

  (H) The inner bag 71 and the gas generator 60 may be arranged in a different place in the airbag main body 41 from the above-described embodiment, for example, at the rear end in the vehicle longitudinal direction. In this case, the discharge hole 79 is provided so that the inflation gas G can be discharged toward the front portion of the airbag body 41.

(I) The airbag body 41 may be disposed in the seat 10 in a folded state (between the seat cushion 11 and the seat pan 13).
(J) A fluid other than the inflation gas G may be used as the inflation fluid.

(K) The present invention is also applicable to a vehicle seat of a type in which a part of a seat frame is constituted by a stretched wire frame portion instead of the seat pan 13.
(L) The present invention is applicable to an airbag device of a type different from the above embodiment, for example, a side airbag device, a curtain shield airbag device, a passenger airbag device, a knee airbag device, and the like. . In short, the present invention can be applied to an airbag device in which a gas generator is disposed in an airbag body and a harness is drawn out of the airbag.

(M) The present invention is applicable to both front and rear seats of a vehicle.
(N) In the present invention, anything other than the occupant P, such as luggage, may be the object to be restrained by the airbag device. When the luggage or the like is placed on the seat 10 as an object to be restrained, the same effect as in the above embodiment can be obtained.

  41 ... airbag body, 43, 76, 81 ... fold line, 44, 73 ... folded part, 45, 74 ... insertion hole, 46, 75 ... through hole (holding means), 47 ... one end side, 48, 49 ... crossing Sides, 50, 77 ... connecting line, 51, 52 ... cross connecting line, 51A, 52A ... end, 51B, 52B ... extending end, 53, 78 ... insertion port, 60 ... gas generator, 63 ... gas discharge part , 64 ... harness, 65 ... connection part, 68 ... mounting bolt, 80 ... extension part, 82 ... shaft, 83 ... first panel, 84 ... second panel, 85 ... extension connection part.

Claims (4)

A rectangular fabric folded at the center portion or a plurality of rectangular fabrics overlapped with each other is used, and at least near a pair of intersecting sides (48, 49) intersecting one end side (47) of the fabric. An airbag body (41) that joins the fabrics along the set connection lines (51, 52), and has an insertion port (53, 78) between both ends on the one end side of the connection lines;
A gas generator (60) that is inserted into the airbag body from the insertion port, is disposed near the insertion port in the airbag body, and supplies and inflates an inflation gas to the airbag body. ,
The gas generator is provided with a mounting bolt (68), and an insertion hole (45, 74) is provided in a position corresponding to the mounting bolt in the airbag body.
The airbag device, wherein the mounting bolt (68) is inserted into the insertion hole and protrudes to the outside of the airbag body, and is fastened to a vehicle at the protruding portion,
Outside the insertion opening of the airbag body, a folded portion (44) that is folded along a folding line (43, 76, 81) between the one end side end and the gas generator is provided. Formed,
The gas generator has an elongated outer shape, and is arranged so that an axis (82) direction is along the one end side,
The folded portion includes an extension (80) that covers the gas generator and extends away from the gas generator from an end of the gas generator in the axial direction,
When the mounting bolt side of the airbag body is a first panel (83) and the opposite side of the airbag body from the mounting bolt is a second panel (84), the folded portion is held in a folded state. An airbag device provided with an extension coupling portion (85) for coupling the first panel and the extension portion. 2. The airbag device according to claim 1, further comprising: the mounting bolt; and a through hole provided in the folded portion and through which the mounting bolt passes so as to hold the folded portion in a folded state. 3. .   3. The airbag device according to claim 1, wherein the extension connection portion intersects the pair of connection lines. 4.   The airbag device according to any one of claims 1 to 3, wherein the folded portion is disposed between the first panel and the gas generator.

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