JP2005088683A - Airbag device for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a front passenger seat having a developed and expanded airbag capable of restraining a passenger near a suitable position, and suppressing interference with an obstacle even when the obstacle with height generally same an upper surface level of an instrument panel is disposed near the instrument panel. <P>SOLUTION: The airbag device M for the front passenger seat comprises the airbag 10 that can expand when gas flows in, and a case 45 storing and holding the folded airbag. The airbag is made to be an annular element comprising a center hole 11 penetrating in a generally vertical direction at the time of finishing the expansion and finishing the expansion so as to close the center hole. The airbag comprises inner peripheral side base cloth 22 in an inner peripheral surface side of the center hole, and outer peripheral surface side base cloth 26 in an outer peripheral surface side. In a front part side of the base cloth 26, a gas flow inlet 18 attached to the case at a peripheral edge is arranged. An opening 11a in a lower part side of the center hole is expanded at the time of expanding, and a lower part side peripheral edge 12a of the center hole is moved downward, thereby finishing the expansion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an airbag device for a passenger seat mounted on a portion of an instrument panel (hereinafter abbreviated as instrument panel) in front of the passenger seat.

  2. Description of the Related Art Conventionally, in a passenger seat airbag device, a bag-like airbag is formed from a passenger side wall portion that is arranged along a substantially vertical direction on the occupant side as a shape when deployment and inflation are completed, and an outer periphery of the occupant side wall portion. It was made into the substantially cone shape provided with the surrounding wall part narrowed in the substantially cone shape at the front side (for example, refer patent document 1). In addition, this airbag has a configuration in which a gas inlet is disposed as an opening surface along a substantially horizontal direction on the front side on the lower side of the peripheral wall at the time of completion of deployment and the gas inlet periphery is attached to the case.

  This air bag is pre-folded and then folded horizontally and folded in the left-right direction and vertically folded in the front-rear direction and stored in the case. The vicinity of the upper edge of the occupant side wall is arranged at a position facing the gas inlet, and the occupant side wall is flattened on the lower side of the peripheral wall.

  In such an airbag device, when the airbag is deployed and inflated, the airbag causes the inflation gas to flow in from the gas inlet and pushes open the door disposed on the instrument panel while eliminating the folds in the horizontal and vertical folds. In this case, when the airbag is pre-folded, a portion near the upper edge of the occupant side wall is disposed at a position facing the gas inlet. From the vicinity of the upper edge portion of the occupant side wall portion facing the gas inlet, in comparison with other portions such as the lower edge side portion of the occupant side wall portion due to the pressing force of the inflation gas at the beginning of the inflow, Since it was pushed upward strongly, it was easy to arrange the occupant side wall portion along the substantially vertical direction.

If the area near the upper edge of the occupant side wall portion is pushed up strongly, it can contribute to quickly eliminating the folds of the horizontal fold and the vertical fold, and the occupant side wall portion can be widely expanded. When the bag is deployed and inflated, the occupant side wall portion that is in a state substantially orthogonal to the gas inlet peripheral edge can be quickly arranged along the substantially vertical direction so that a partial pressing force does not act on the occupant side. The airbag can be deployed in a wide open state.
JP 2002-255004 A

  However, in the conventional airbag device for a passenger seat, when the airbag is deployed and inflated, the occupant side wall portion can move to the rear side of the vehicle with a wide surface arranged in a substantially vertical direction, but in the vicinity of the instrument panel. In the case where an obstacle up to the height of the instrument panel is arranged, there is room for improvement in suppressing the interference with the obstacle and completing the inflation of the airbag. .

  The present invention solves the above-described problem, and an airbag that is inflated and inflated can restrain an occupant in the vicinity of an appropriate position on a wide surface, and is an obstacle with a height near the top of the instrument panel near the instrument panel. It is an object of the present invention to provide an airbag device for a passenger seat that can suppress interference with an obstacle even when the vehicle is disposed.

An airbag device for a passenger seat according to the present invention includes an airbag that is folded and stored so as to be inflatable when inflating gas flows in,
A case arranged to store and hold the folded airbag and to be able to project the airbag when inflated from the instrument panel in front of the passenger seat to the vehicle rear side;
An airbag device for a passenger seat equipped with
Airbag
A central hole penetrating substantially along the vertical direction at the completion of the expansion is arranged, and is configured as an annular body that completes the expansion so that the central hole is closed by a surrounding base cloth,
An inner peripheral base fabric positioned on the inner peripheral surface side of the central hole, and an outer peripheral base fabric positioned on the outer peripheral surface side of the airbag so as to face the inner peripheral base fabric when the inflation is completed And
Furthermore, a gas inlet that is opened for inflow of inflation gas by disposing a peripheral edge to the case on the front side of the outer peripheral side fabric is arranged to widen the opening on the lower side of the central hole during inflation. The state is characterized in that the lower peripheral edge of the central hole is moved from above to below to complete the expansion.

  In the passenger seat airbag device according to the present invention, when the airbag is inflated, the lower peripheral edge of the center hole is moved downward from the upper side with the opening on the lower side of the center hole widened, and the airbag is inflated. Since it is completed, even if there is an obstacle in the vicinity of the upper surface of the instrument panel near the instrument panel, the airbag can be inserted into the central hole from below. That is, the airbag can complete the inflation by suppressing interference with the obstacle that strongly pushes down the obstacle or pushes it toward the rear of the vehicle.

  Even when there are no obstacles, the airbag has an annular shape when inflating gas is allowed to flow in from the gas inlet, so that the left and right sides of the airbag are between the outer peripheral base fabric and the inner peripheral base fabric. Therefore, while the center hole is opened, the occupant side wall portion of the outer base fabric is widened in the left-right direction and moved to the rear side of the vehicle, so the seat is seated with the back positioned near the backrest portion of the seat. Even if the occupant who was sitting, that is, the occupant seated in the vicinity of the appropriate position, moves forward, the occupant is accurately restrained by the occupant side portion that is wide in the left-right direction without applying partial pressing force can do.

  Therefore, in the passenger airbag device according to the present invention, the airbag that is inflated and inflated can restrain an occupant in the vicinity of the appropriate position on a wide surface, and also has an obstacle in the vicinity of the instrument panel up to the upper surface of the instrument panel Even if is arranged, an obstacle can be inserted into the central hole, and interference with the obstacle can be suppressed.

  In this case, the airbag is in a non-inflated state with the lower peripheral edge of the central hole folded upward and the gas inlet positioned on the lower surface, with the inner peripheral base above the gas inlet. Place the outer fabric on the outer circumference with the cloth in between, pre-fold it so that it is flattened in a substantially bilaterally symmetrical shape, and then fold it in the left-right direction so that it can be stored in the case from the pre-folded state. You may fold by the horizontal fold which narrows the width dimension of the front-back direction centering on a gas inflow opening, and the vertical fold which attaches the fold of the front-back direction and narrows the width dimension of the left-right direction.

  If the airbag is folded in this way, the airbag at the time of inflation can be opened to the lower peripheral edge of the central hole without inflating gas flowing into the central hole. Compared with the case where the lower peripheral edge of the central hole is inflated without being folded back, it can be opened with a wider inner diameter, and it becomes easier to insert the obstacle into the central hole. The expansion can be completed by further suppressing interference with an obstacle that is pushed down or pushed toward the rear of the vehicle. In addition, the airbag folded in this way is inflated by moving the lower peripheral edge of the central hole downward from the upper side, since the folded portion on the lower side expands after the portion on the upper side from the folded portion expands. It becomes easy to obtain the aspect to complete.

  When the airbag is inflated, the lower side peripheral edge of the central hole is moved downward from the upper side to complete the inflation. In addition to providing the folded portion, the inflation is performed so that a large amount of inflation gas flows to the upper side. Rectifying means for controlling the flow of the gas for the passenger or pre-folding so that the upper edge side of the passenger side wall portion faces the gas inlet, and the upper edge side of the passenger side wall portion is quickly positioned upward when inflated. Thus, the folding means can be configured to complete the expansion.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an airbag device M for a passenger seat according to the embodiment has an upper surface 1 a side on the surface of an instrument panel (instrument panel) 1. It is a top mount type that is placed inside the. The airbag apparatus M includes a folded airbag 10, an inflator 43 that supplies inflation gas to the airbag 10, a case 45 that stores and holds the airbag 10 and the inflator 43, and the airbag 10 in the case 45. The retainer 41 for attaching and the airbag cover 53 which covers the folded airbag 10 are comprised.

  The vertical / front / rear / left / right relationship in this specification is based on the state in which the passenger seat airbag device M is mounted on the vehicle. It matches.

  In the embodiment, the airbag cover 53 is formed integrally with the instrument panel 1 as shown in FIGS. The instrument panel 1 includes a base portion 2 made of a hard synthetic resin such as polypropylene on the back surface side, and a covering layer 3 having a foam layer such as polyurethane foam and a skin layer covering the outer surface side of the base portion 2. Configured. A soft portion 4 made of a soft synthetic resin such as a polyolefin-based thermoplastic elastomer is disposed in place of the base portion 2 at a portion of the airbag cover 53. The airbag cover 53 is configured by arranging two door portions 54F and 54B around which a thin portion to be broken 56 is disposed. The fracture | rupture planned part 56 is arrange | positioned at the H shape seeing from the upper direction of the instrument panel 1, and the two door parts 54F and 54B open to the front and back both sides by making the front end side and the rear end side into hinge parts 55, respectively. It is configured as such.

  Further, a connecting wall portion 57 having a substantially rectangular tube shape that protrudes downward from the back surface side is disposed at a portion of the airbag cover 53 so as to surround the arrangement position of the door portions 54F and 54B. A plurality of locking holes 58 are penetrated through the connecting wall portion 57 at predetermined positions of the wall portions 57a and 57b facing each other in the front-rear direction. A locking claw 51 formed in the case 45 is inserted into the locking holes 58, and the connecting wall portion 57 is locked to the locking claw 51. Locking of the connecting wall portion 57 of each locking claw 51 secures the connection state between the connecting wall portion 57 and the case 45, and the airbag 10 when inflated smoothly pushes up the door portions 54F and 54B. This is because the planned fracture portion 56 can be broken.

  In the case of the embodiment, the soft portion 4 includes the back surface side of the door portions 54F and 54B of the airbag cover 53, the connecting wall portion 57 itself, and the instrument panel 1 near the hinge portions 55 of the door portions 54F and 54B. It is arrange | positioned in the front-back site | part which exceeded the connection wall part 57 in the back surface side.

  As shown in FIGS. 1 and 2, the case 45 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having a rectangular opening 45 a on the upper end side, and has a rectangular plate-shaped bottom wall portion 46, and an outside of the bottom wall portion 46. A side wall 50 extending upward on the side of the airbag cover 53 is formed in a substantially rectangular tube shape from the periphery. The bottom wall portion 46 has a rectangular plate shape that extends in the left-right direction, and has an insertion hole 47 that opens in a substantially circular shape in the center so that the upper side of the inflator 43 can be inserted from below into the upper side of the airbag cover 53. I have. An attachment hole 48 through which each bolt 41 b of the retainer 41 can be inserted is formed at the periphery of the insertion hole 47 of the bottom wall portion 46. In addition, a bracket 49 for connecting the case 45 to the vehicle body 6 side is fixed to the bottom wall portion 46 on the lower surface side of the left and right side portions of the bottom wall portion 46. A nut 49 a for screwing the bolt 7 is fixed to each bracket 49. A bracket 6b extending from the reinforcement 6a is disposed on the body 6 side, and the bolt 7 passes through the mounting seat 6c of the bracket 6b and is screwed into the nut 49a. The case 45, that is, the airbag apparatus M, is attached and fixed to the body 6 side by tightening each bolt 7 to the nut 49a.

  A rib 46 a protruding upward so as to surround the insertion hole 47 is formed on the peripheral edge of the bottom wall portion 46 in the vicinity of the insertion hole 47. The rib 46 a is disposed in a region below the base 41 a of the retainer 41, and seals the bottom wall 46 and the peripheral edge 17 of the gas inlet 18 of the airbag 10 when the base 41 a is pressed toward the bottom wall 46. It is provided in order to improve the performance.

  The side wall 50 of the case 45 is formed with a plurality of locking claws 51 that are inverted outward and downward from the case 45 at the upper ends of the front and rear parts of the vehicle. As described above, each locking claw 51 is inserted into the locking hole 58 of the connecting wall portion 57 of the airbag cover 53 to lock the connecting wall portion 57.

  The inflator 43 is of a disc type provided with a substantially cylindrical main body 43a having a plurality of gas discharge ports 43b on the upper outer peripheral surface. A flange portion 43 c for attaching the inflator 43 to the case 45 is provided on the outer peripheral surface of the main body portion 43 a. The flange portion 43c has a substantially quadrangular annular shape (substantially square plate shape) protruding from the outer peripheral surface of the main body portion 43a, and has attachment holes 43d penetrating through the four corners. Each mounting hole 43 d is disposed at a position corresponding to each mounting hole 48 of the bottom wall portion 46 of the case 45, and has the same inner diameter dimension as the inner diameter dimension of the mounting hole 48.

  The retainer 41 is formed of a sheet metal, and has a base portion 41a having a hole that opens substantially in the same shape as the insertion hole 47 of the case 45, and a substantially rectangular tube shape that extends upward from the outer peripheral edge of the base portion 41a on the airbag cover 53 side. And a guide wall portion 41c. The base 41a has an outer peripheral edge formed in a substantially square shape (substantially square shape), and bolts 41b extending downward are fixed to the four corner portions. The bolts 41b are formed in the state in which the retainer 41 is disposed in the airbag 10, and the mounting hole 19 of the airbag 10, the mounting hole 48 of the bottom wall portion 46 of the case 45, and the mounting hole of the flange portion 43c of the inflator 43. The airbag 10 and the inflator 43 are attached to the bottom wall portion 46 of the case 45 by being inserted into 43d and tightening the nut 42. That is, when the nut 42 is tightened to each bolt 41b, the peripheral edge 17 of the gas inlet 18 of the airbag 10 is pressed against the bottom wall portion 46 by the base portion 41a, and the airbag 10 is attached to the bottom wall portion 46. The flange portion 43 c of 43 is pressed against the peripheral edge of the insertion hole 47, and the inflator 43 is attached to the bottom wall portion 46. Further, the guide wall portion 41 c of the retainer 41 is disposed by extending the tip extending upward to a height that matches the upper end surface of the main body portion 43 a of the inflator 43. The guide wall portion 41c extends upward on the airbag cover 53 side from the outer edge of the base portion 41a having a substantially rectangular shape.

  As shown in FIGS. 1 to 6, the airbag 10 has a shape that expands into a substantially quadrangular pyramid shape that narrows toward the front portion with the occupant-side wall portion 28 as a bottom surface, and a front upper portion 10 a at the completion of the expansion. The center hole 11 penetrating along the substantially vertical direction from the rear lower part 10b to the rear lower part 10b is arranged, and is configured as an annular body that completes expansion so that the center hole 11 is closed by the surrounding base cloth 22 Yes. That is, in the airbag 10, the annular main body portion 12 that is inflated and inflated has a front inflatable portion 13, a rear inflatable portion 14, a left inflatable portion 15, and a right inflatable portion 16 around the central hole 11. Configured.

  Further, as the sheet material constituting the annular main body portion 12, an air bag is provided so as to face the inner peripheral base fabric 22 located on the inner peripheral surface side of the central hole 11 and the inner peripheral base fabric 22 at the completion of the inflation. 10 and the outer peripheral side base cloth 26 located on the outer peripheral surface side. Further, as shown in FIG. 7, the inner peripheral base fabric 22 has a first inner base fabric 23 on the front side which is greatly recessed on the lower edge 23 d side, and a second inner base fabric 24 having a rectangular plate shape on the rear side. And is composed of. Further, the outer peripheral base fabric 26 includes a first outer base fabric 27 on the front side, which is greatly recessed on the lower edge 27d side, and a second outer base fabric 28 in the form of a rectangular plate serving as an occupant side wall on the rear side. It is configured. These base fabrics 23, 24, 27, and 28 are formed from flexible woven fabrics such as polyester yarns and polyamide yarns together with reinforcing fabrics 30, 31, and 32, which will be described later. It is configured as a non-coated cloth that is not applied. The first inner base fabric 23 has inner surfaces 15b and 16b of the left inflating portion 15 and the right inflating portion 16 so as to extend from the portion constituting the rear surface 13b side of the front inflating portion 13 to the left and right sides on the obliquely rear side. The part which comprises the side is arrange | positioned and it is comprised. The first outer base fabric 26 extends from the portion constituting the front surface 13a side of the front expansion portion 13 to the left and right sides of the rear side on the upper side, and the outer surfaces 15a and 16a of the left expansion portion 15 and the right expansion portion 16 are extended. The part which comprises the side is arrange | positioned and it is comprised. The second inner base fabric 24 serves as a portion constituting the front surface 14a of the rear side inflatable portion 14, and the second outer base fabric 28 serves as a portion constituting the rear surface 14b of the rear side inflatable portion 14.

  Further, a circular opening is provided in a portion of the outer peripheral side fabric 26 of the airbag 10 on the front surface 13a side of the front side inflating portion 13 as the center in the left-right direction, and the peripheral edge 17 is formed in the case 45. A gas inlet 18 to be attached to is installed. A plurality of mounting holes 19 are formed in the peripheral edge 17 of the gas inlet 18 to allow the bolt 41 b of the retainer 41 to pass therethrough and attach the inlet peripheral edge 17 to the bottom wall portion 46 of the case 45. Two reinforcing cloths 30 and 32 are stitched and disposed at the inlet peripheral edge 17 on the inner peripheral surface side in the airbag 10, and further, a stitched portion is protected on the upper surface side of the reinforcing cloth 30. A reinforcing cloth 31 is arranged without being sewn. Each reinforcing cloth 30, 31, 32 is also provided with a gas inlet 18 and a mounting hole 19. Furthermore, the outer base fabric 26 is provided with vent holes 20 for exhausting excess inflation gas at the left and right inflated portions 15 and 16.

  Further, in the airbag 10, rectifying portions 33 and 33 are formed in the vicinity of the boundary portion between the front side inflating portion 13 and the left and right inflating portions 14 and 15 so as to branch the inflating gas up and down. These rectifying sections 33 are formed by joining the inner peripheral base fabric 22 and the outer peripheral base fabric 26 to each other by stitching them into an elliptical shape with the reinforcing cloth 32 interposed therebetween. As shown in FIG. 14, these rectifiers 33 rectify the expansion gas G so as to branch up and down and flow to the rear side, and to flow more to the upper side.

  In the case of the embodiment, the annular main body 12 is formed by stitching using a suture thread 34 such as polyester thread. First, the first inner base cloth 23 and the first outer base cloth 27 are formed. The lower edges 23d and 27d are sewn together, and then the left edge 24b of the second inner base fabric 24 and the edge 23b on the left end side of the first inner base fabric 23 are sewn and the right side of the second inner base fabric 24 is sewn. The edge 24c and the edge 23c on the right end side of the first inner base fabric 23 are stitched together to form an annular inner peripheral base fabric 22, and the left edge 28b of the second outer base fabric 28 and the first outer base The edge 27b on the left end side of the cloth 27 is stitched, and the right edge 28c of the second outer base cloth 28 and the edge 27c on the right end side of the first outer base cloth 27 are stitched to form an annular outer peripheral base cloth 26. Form. The reinforcing cloths 30 and 32 are sewn to the first outer base cloth 27 in advance. The gas inlet 18 and the mounting hole 19 may be formed in the base cloth 27 and the reinforcing cloths 30, 31, and 32, respectively, or the base cloth 27 and the reinforcing cloths 30 and 32 are sewn and reinforced. After the cloth 31 is placed, the gas inlet 18 and the mounting hole 19 may be integrally formed by drilling.

  Next, the lower edge 24d of the second inner base fabric 24 of the inner peripheral base fabric 22 and the lower edge 28d of the second outer base fabric 28 of the outer peripheral base fabric 26 are stitched together, so that the seam allowance at the stitched portion is an airbag. The base fabrics 22 and 26 are inverted so that they are not exposed to the outer peripheral surface of the outer peripheral surface 10, and the upper edges 23a and 27a of the first inner base fabric 23 and the first outer base fabric 27 are sewn together, and the second inner side The upper edges 24a and 28a of the base fabric 24 and the second outer base fabric 28 are stitched together.

  Further, if the inner peripheral side base fabric 22 and the outer peripheral side base fabric 26 near the front side of the left and right inflatable portions 15 and 16 are stitched to form the rectifying portions 33 and 33, the annular main body of the embodiment Part 12 (airbag 10) can be formed.

  The mounting of the airbag 10 manufactured as described above on a vehicle will be described. First, the airbag 10 is folded with the retainer 41 disposed therein so that the bolt 41b protrudes from each mounting hole 19. Further, the folded airbag 10 is wrapped with a breakable wrapping sheet 40 (see FIG. 2) so as not to collapse. Then, the airbag 10 is folded through a preliminary folding process and then a horizontal folding process and a vertical folding process.

  In the preliminary folding step, a preliminary folded airbag 36 as shown in FIG. 9 is formed. In this preliminary folding, first of all, basically, as shown in FIG. 8, the gas inlet 18 is positioned on the lower surface side with the airbag 10 (annular main body 12) in a non-inflated state, and the gas inlet 18 An outer peripheral base fabric 26 is disposed above the inner peripheral base fabric 22 so as to be developed in a substantially symmetrical form. At this time, as shown in FIG. 9, the lower peripheral edge 12 a of the central hole 11 when the expansion is completed is folded back to the upper side 11 b in the central hole 11 to form a folded portion 35. The lower edge 36a after folding is positioned near the inlet periphery 17 where the front center 36af is pressed by the retainer 41, and the center hole 11 when the airbag 10 is inflated is opened in a substantially circular shape as shown in FIG. In this state, the amount of folding of the rear side 12ab is larger than that of the front side 12af of the lower peripheral edge 12a so that the rear side center 36ab is positioned above the front side center 36af in the state immediately before the folding of the folded back. doing.

  After the preliminary folding step, as shown in FIGS. 10A and 10B, the width in the front-rear direction centered on the gas inlet 18 with a fold CH in the left-right direction so that the dimensions can be accommodated in the case 45. The preliminary folding airbag 36 is folded by a horizontal folding process for narrowing the dimension and a vertical folding process for narrowing the width dimension in the left-right direction by attaching a fold CV in the front-rear direction as shown in FIG. In the case of the embodiment, in the lateral folding process, the portion 37 (see A in FIGS. 9 and 10) on the front side of the gas inlet 18 is moved to the bellows so that the front edge 36b side approaches the gas inlet 18. It is folded and placed above the gas inlet 18. Further, in the vertical folding process, the portions 38 and 39 on the left and right edges 36c and 36d are bellows folded so that the left and right edges 36c and 36d are brought close to the gas inlet 18, and above the gas inlet 18 Placed in position.

  When the folding of the airbag 10 is completed through the vertical folding process, the folded airbag 10 is wrapped with the wrapping sheet 40 that can be broken so as not to collapse as described above.

  Thereafter, the folded airbag 10 is placed on the bottom wall portion 46 of the case 45 through the opening 45 a while the bolts 41 b are inserted through the attachment holes 48 from above. Next, the upper part of the main body 43a of the inflator 43 is inserted into the insertion hole 47, the gas inlet 18, and the base 41a of the retainer 41 from below, and each bolt 41b protruding downward from the bottom wall 46 is inserted. The flange 43c of the inflator 43 is inserted into the mounting hole 43d. Thereafter, when the nut 42 is fastened to each bolt 41 b protruding from the flange portion 43 c of the inflator 43, the folded airbag 10 and the inflator 43 can be attached to the bottom wall portion 46 of the case 45.

  Thereafter, the side wall portion 50 of the case 45 is inserted into the connecting wall portion 57 of the airbag cover 53 in the instrument panel 1 mounted on the vehicle, and the locking claws 51 of the case 45 are inserted into the locking holes of the connecting wall portion 57. 58, the locking claws 51 are locked to the connecting wall portion 57. Further, if the bolt 7 is fastened to the nut 49a of each bracket 49 via the mounting seat 6c, the passenger seat airbag device M can be mounted on the vehicle.

  In addition, when the airbag apparatus M is mounted on the vehicle in advance, when the case 45 to which the airbag 10 and the inflator 43 are attached is assembled to the airbag cover 53 of the instrument panel 1 in advance, The airbag device M may be mounted on the vehicle by using the bolt 7 to connect and fix the airbag device M to the body 6 side.

  If the inflation gas is discharged from the gas discharge ports 43b of the inflator 43 after the airbag device M is mounted on the vehicle, the airbag 10 expands and breaks the wrapping sheet 40, and the airbag cover 53 The airbag 10 is opened by opening the doors 54F and 54B as shown by the two-dot chain lines in FIGS. From the opening 59, it protrudes greatly. The airbag 10 completes the inflation and discharges excess inflation gas from the vent hole 20. In addition, the member of the code | symbol W of FIG. 1 is a windshield.

  In the airbag apparatus M of this embodiment, the airbag 10 is configured as an annular main body portion 12 having a central hole 11 from the front upper portion 10a to the rear lower portion 10b when the inflation is completed. On the front surface 13a side of the base fabric 26, a gas inflow port 18 that is opened for inflow of the inflation gas G by attaching the peripheral edge 17 to the case 45 is provided. Therefore, when the airbag 10 is inflated, the inflation gas G from the inflator 43 inserted into the gas inlet 18 flows vertically from the front inflation portion 13 to the left and right left and right inflation portions 15 and 16. As shown in the airbags 10A, 10B, 10C, 10D, and 10E illustrated in FIG. In this state, the lower side opening 11a is expanded, and further, the rear side expansion portion 14 moves downward from above to complete the expansion.

  That is, in this airbag 10, the lower peripheral edge 12 a of the central hole 11 moves downward from above as shown in airbags 10 A, 10 B, 10 C, 10 D, and 10 E shown in FIGS. Since the expansion of the portion 35 is canceled and the expansion is completed so as to close the central hole 11, the obstacle B having a height to the vicinity of the upper surface 1 a of the instrument panel 1 is close to the instrument panel 1 before the central hole 11 is closed. Even if there is, the airbag 10 can insert the obstacle B into the central hole 11 from below. That is, the airbag 10 can complete the inflation by suppressing interference with the obstacle B that strongly pushes down the obstacle B or pushes the obstacle B backward.

  And even if there is no obstacle B, the airbag 10 has an annular shape when the inflation gas G is introduced from the gas inlet 18, so that the airbags 10A, 10B, and 10C shown in FIG. In addition, while flowing to the left and right sides between the outer peripheral base fabric 26 and the inner peripheral base fabric 22, the central hole 11 is opened, and the occupant side wall portion 28 and its vicinity in the outer peripheral base fabric 26 are moved in the left-right direction. Since the passenger is seated with the back placed near the backrest of the seat, that is, the passenger seated in the vicinity of the appropriate position is moved forward. The occupant can be accurately restrained by the occupant side portion that is wide in the left-right direction, that is, the wall portion 28 itself or the first outer peripheral side base cloth 27 in the vicinity of the wall portion 28 without applying a pressing force. .

  Therefore, in the passenger airbag device M of the embodiment, the airbag 10 that is inflated and inflated can restrain an occupant in the vicinity of an appropriate position on a wide surface, and can also be positioned in the vicinity of the instrument panel 1 up to the vicinity of the upper surface 1a of the instrument panel 1. Even if the obstacle B is arranged, interference with the obstacle B can be suppressed by inserting the obstacle B into the central hole 11.

  In the airbag 10 of the embodiment, when folded, the lower peripheral edge 11a of the central hole 11 is folded back to the upper side 11b and the gas inlet 18 is positioned on the lower surface side in a non-inflated state. The outer peripheral base fabric 26 is disposed above the inflow port 18 with the inner peripheral base fabric 22 interposed therebetween, and is preliminarily folded so as to be flattened in a substantially symmetric shape. So that the width dimension in the front-rear direction is narrowed around the gas inlet 18, and the front-rear crease CV is added in the left-right direction. Folding is performed by vertical folding to narrow the width dimension.

  If the airbag 10 is folded in this manner, the airbag 10 when inflated can open the central hole 11 in a state where the inflation gas does not flow into the folded portion 35 at the lower peripheral edge 12a of the central hole 11. The lower opening 11a of the central hole 11 can be opened with a larger inner diameter than in the case where the lower peripheral edge 12a of the central hole 11 is expanded without being folded back. The airbag 10 can complete the inflation by further suppressing interference with the obstacle B that pushes down the obstacle B or pushes the obstacle B backward. In addition, since the folded portion 35 on the lower side of the airbag 10 folded in this way is inflated after the portion on the upper side of the folded portion 35 is inflated, the lower peripheral edge 12a of the central hole 11 is moved downward from above. It becomes easy to obtain a mode in which the expansion is completed by moving.

  Furthermore, in the airbag 10 according to the embodiment, as shown in FIG. 14, the rectifying unit 33 is provided as a rectifying unit that regulates the flow of the gas G so that the inflation gas G is branched up and down and flows to the upper side. A mode in which the lower peripheral edge 12a of the central hole 11 is moved downward from the upper side to complete the expansion when the airbag 10 is inflated, that is, the rear side with the vicinity of the peripheral edge 17 of the gas inlet 18 as the center of rotation is provided. It is easy to obtain an aspect in which the inflating portion 14 is rotated downward. Note that such a rectifying unit 33 can be configured by a tether that connects the base fabrics 22 and 26 to restrict the flow of the gas G, or a cylindrical rectifying cloth that guides the gas G. .

  Furthermore, when the airbag 10 is inflated, the lower peripheral edge 12a of the central hole 11 is moved downward from above to complete the inflation (the rear inflatable portion 14 is formed with the vicinity of the peripheral edge 17 of the gas inlet 18 as the rotation center). A mode in which the lower side is rotated and moved is preliminarily folded so that the upper edge 28a side of the occupant side wall 28 is opposed to the gas inlet 18 at the time of preliminary folding, and the rear surface 14b of the rear side expansion portion 14 at the time of expansion. Can be achieved by quickly locating the upper edge 28a side of the occupant side wall 28 so that the inflation is completed in order to quickly follow the substantially vertical direction. The above aspect can also be obtained by means.

  Further, the central hole 11 penetrating the airbag 10 in the substantially vertical direction is joined to a part of the inner peripheral base fabric 22 by sewing or the like, and is partially connected to the inner peripheral side of the inner peripheral base fabric 22. Therefore, one or a plurality may be set.

It is a schematic longitudinal cross-sectional view which shows the vehicle mounting state of the airbag apparatus for passenger seats of one Embodiment which concerns on this invention. It is a general | schematic expanded longitudinal cross-sectional view of the vehicle mounting state in the airbag apparatus for passenger seats of embodiment. It is a perspective view showing the state where the air bag used for the air bag device of an embodiment was inflated alone. FIG. 6 is a schematic cross-sectional view of a state where the airbag of the embodiment is inflated alone, corresponding to the IV-IV part of FIG. 5. It is a schematic longitudinal cross-sectional view of the state which expanded the airbag of embodiment alone, and respond | corresponds to the VV site | part of FIG. It is a schematic longitudinal cross-sectional view of the state which expanded the airbag of embodiment alone, and respond | corresponds to the VI-VI site | part of FIG. It is a figure explaining the member which comprises the airbag of embodiment. It is a figure explaining the preliminary folding process of the airbag of embodiment, Comprising: The figure seen from the gas inflow port side of the airbag, and the figure seen from the wall part side of the passenger | crew. It is a figure which shows the airbag which carried out the preliminary folding of embodiment. It is a figure explaining the horizontal folding process and vertical folding process of the airbag of embodiment. It is a figure explaining the action | operation time of the airbag apparatus for passenger seats of embodiment. It is a figure explaining the time of the action | operation of the airbag apparatus for passenger seats of embodiment, and shows the state after FIG. It is a schematic cross-sectional view for explaining an initial state of inflation of the airbag of the embodiment. It is a figure explaining the effect | action of the rectification | straightening part of the airbag of embodiment.

Explanation of symbols

1 ... (Instrument panel) Instrument panel,
1a: top surface,
10 ... Airbag,
11a ... lower side opening,
12 ... annular body,
18 ... gas inlet,
22 ... Inner circumference base fabric,
26 ... outer peripheral side fabric,
28 ... side wall of passenger,
35 ... the folded part,
36 ... Pre-folded airbag,
G ... expansion gas,
B ... Obstacle,
M ... Airbag device for passenger seat.

Claims (2)

An airbag that is folded and stored inflatable when the inflation gas flows in;
A case arranged to store and hold the folded airbag and to be able to project the airbag when inflated from the instrument panel in front of the passenger seat to the vehicle rear side;
An airbag device for a passenger seat equipped with
The airbag is
A central hole penetrating along substantially the vertical direction at the time of completion of expansion is arranged, and is configured as an annular body that completes expansion so that the central hole is closed by a surrounding base cloth,
An inner peripheral base fabric positioned on the inner peripheral surface side of the central hole, and an outer peripheral base fabric positioned on the outer peripheral surface side of the airbag so as to face the inner peripheral base fabric when the inflation is completed. Configured with
Furthermore, a gas inflow opening is provided on the front side of the outer peripheral base fabric so that a peripheral edge is attached to the case and opened for inflow of the expansion gas. An airbag device for a passenger's seat, which is configured so that the lower peripheral edge of the central hole is moved downward from the upper side to complete the inflation in a state where the opening is widened. The airbag is
In a non-expanded state, the lower peripheral edge of the central hole is folded upward and the gas inlet is positioned on the lower surface side, and the inner peripheral base fabric is interposed above the gas inlet. The outer peripheral base fabric is arranged and pre-folded so as to be developed in a substantially bilaterally symmetric flat shape,
From the pre-folded state, lateral folds with a fold in the left-right direction to reduce the width in the front-rear direction centered on the gas inlet and the fold in the front-rear direction so that the dimensions can be accommodated in the case The airbag device for a passenger's seat according to claim 1, wherein the airbag device is folded by vertical folding to reduce the width dimension in the left-right direction.

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