JP2006076384A - Air bag device for front passenger seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag device for a front passenger seat capable of protecting a deployed air bag from a peripheral storage part and an air bag cover and smoothly inflating the air bag. <P>SOLUTION: In the air bag device for the front passenger seat, the air bag 31 is stored in the storage part 16 by arranging a wrapping material 52 so as to cover a periphery of a folded body 49 over the substantially whole surface. The wrapping material 52 is provided with a protection part 57 for covering the substantially whole surface from an inner peripheral surface side of the storage part to an upper surface side of a door part 7b opened so as to be reversed and protecting the air bag 31 from the door part 7b in an initial state of inflation of the air bag 31. In the protection part 57, a length dimension deployed from a base end 57b to a distal end 57a is set larger than a width dimension W1 of the folded body 49. The protection part 57 is folded/arranged such that it is positioned on an upper side of the folded body 49 in such a state that the distal end 57a side is pressed by a pressing part 60. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an airbag device for a passenger seat disposed in a portion of an instrument panel (hereinafter referred to as “instrument panel”) in front of a passenger seat of a vehicle.

2. Description of the Related Art Conventionally, an airbag device for a passenger seat includes an airbag that is folded and stored, a storage portion that stores the airbag and that opens at the upper end side, and an airbag that covers the opening of the storage portion. There has been a configuration including an airbag cover having a door portion that can be opened when the bag is deployed and inflated. And there existed the thing of the structure which arrange | positions a sheet metal in the back surface side of a door part while making an accommodating part into sheet metal in the airbag apparatus for passenger seats (for example, refer patent document 1).
Japanese Patent Laid-Open No. 2003-48502

  Normally, a wrapping material that holds the folded shape of the airbag around the folded airbag and that allows the airbag to protrude when the airbag is deployed and inflated folds the airbag. It arrange | positions so that the circumference | surroundings of the folding completion body formed may be covered over substantially the whole surface.

  However, the conventionally used wrapping material does not consider covering the inner peripheral surface side portion of the storage portion or the open door portion portion of the airbag cover when the airbag is deployed and inflated. Therefore, as in the conventional case, in the case of an airbag device for a passenger seat that uses a sheet metal storage portion and a sheet metal is also provided on the back side of the door portion, an airbag that is deployed and inflated is used. There was a problem in protecting from the storage part and the open door part.

  This invention solves the above-mentioned subject, can protect the airbag to expand | deploy from the storage part and airbag cover which are arrange | positioned around, and can inflate an airbag smoothly. An object of the present invention is to provide a passenger airbag device.

The airbag device for a passenger seat according to the present invention is disposed at a portion of the instrument panel in front of the passenger seat of the vehicle,
An airbag that is folded and stored, a storage portion that stores the airbag and that opens at the upper end side, and is arranged so as to cover the opening of the storage portion so that it can be opened when the airbag is deployed and inflated. An airbag cover having a door portion,
For passenger seats with a configuration in which the airbag forms a folded folded body and covers the entire area of the folded body with wrapping prevention wrapping material disposed in the storage section. In the airbag device,
Wrapping material
At the initial stage of inflation of the airbag, the front end side is deployed so as to protrude above the opening of the storage portion, and is opened so as to be reversed from the inner peripheral surface side of the storage portion. A protective part that is disposed so as to cover substantially the entire surface over the upper surface side of the door part, and protects the airbag from the door part;
When the wrapping material is disposed around the folding completed body, the presser part is disposed so that the protective part can be pressed to the folding completed body side,
Is configured to include,
Protection part is
The length of the unfolded length from the base end to the tip of the position on the base side that becomes the rotation center when the door is opened is larger than the width dimension in the direction along the door opening direction on the upper surface of the folded body As well as
At the time of storage in the storage unit, the tip end side is positioned above the folding completed body and in a range between the folding completed body and the door part while being pressed by the pressing unit. It is characterized by being folded and disposed.

  In the airbag device for a passenger seat according to the present invention, the wrapping material that covers the entire periphery of the folding completed body stored in the storage portion protrudes above the opening of the storage portion at the initial stage of inflation of the airbag. The protection portion is configured to be covered so as to cover almost the entire surface of the door portion that is opened so as to be reversed from the inner peripheral surface side of the storage portion. That is, in the passenger seat airbag device of the present invention, at the initial stage of inflation of the airbag, the protective portion of the wrapping material is pushed by the airbag that is inflated, protrudes from the opening of the storage portion, and from the inner peripheral surface side of the storage portion It will unfold so that it may cover substantially the whole surface over the upper surface side of the door part opened so that it may reverse. In the passenger seat airbag device of the present invention, the protective part has a length dimension developed from the base end to the front end of the position on the base part side that is the center of rotation when the door part is opened. It is set to be larger than the width dimension in the direction along the opening direction of the door on the upper surface, but the tip of the protection part is sandwiched between the folding completion body and the storage part when stored in the storage part. Instead, the tip side is folded and arranged so as to be positioned above the folding completion body and between the folding completion body and the door portion while being held down by the holding portion. This is the configuration that is provided. Therefore, the protective part can be reliably projected from the opening of the storage part together with the airbag without hindering the deployment of the airbag, and when the airbag is deployed and inflated, the inner peripheral surface of the storage part and the door part The upper surface is covered with the protection part, and the airbag that is deployed and inflated can be protected from the inner peripheral surface of the storage part and the door part. As a result, even if the passenger seat airbag device has a configuration in which the storage portion is made of sheet metal and the sheet metal is disposed on the back side of the door portion, the airbag that is deployed and inflated can be Therefore, the airbag can be prevented from being damaged by interfering with the surrounding door portion and the storage portion, and the airbag can be smoothly deployed and inflated.

  Therefore, in the passenger seat airbag device of the present invention, the airbag to be deployed can be protected from the storage portion and the airbag cover disposed around the airbag, and the airbag can be inflated smoothly.

Further, in the passenger seat airbag device having the above-described configuration, the protection portion is provided with a folding portion that is folded so as to fold the portion on the front end side that covers the upper surface side of the opened door portion. It is configured to be arranged on the side,
It is preferable that the length dimension from the base end to the front folding side of the protection part is set to be larger than the distance from the base end to the base part that is the rotation center when the door part is opened.

  In the passenger seat airbag device having the above-described configuration, the length dimension from the base end to the folding portion on the front end side in the protective part is larger than the distance from the base end to the base part that is the rotation center when the door part is opened. Since it is set to be large, the folded portion can be reliably projected from the opening of the storage portion in the initial stage of inflation of the airbag. That is, in the airbag device for a passenger seat having the above-described configuration, the folded portion is not sandwiched between the inflating airbag and the inner peripheral surface of the storage portion at the initial stage of inflation of the airbag. Since it can be made to protrude from opening, a door part can be covered reliably at the time of expansion | deployment of an airbag.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, as shown in FIGS. 1 and 2, a top-mount type passenger seat airbag apparatus M disposed inside the upper surface 2 of the instrument panel 1 will be described as an example. In the case of the embodiment, the airbag device M is disposed in the region of the upper panel 1a of the instrument panel 1 constituted by the upper panel 1a and the lower panel 1b. In addition, the vertical, front-rear, and left-right directions in the present specification correspond to the vertical, front-rear, left-right directions in a straight traveling state of the vehicle unless otherwise specified.

  As shown in FIGS. 2 and 3, the airbag apparatus M according to the embodiment includes a folded airbag 31, a wrapping material 52 disposed around the folded airbag 31, and an inflation gas in the airbag 31. An inflator 24 for supplying air, a case 16 as a storage part for storing and holding the airbag 31 and the inflator 24, a retainer 28 for attaching the airbag 31 to the case 16, and an airbag cover 6 covering the case 16. It is prepared for.

  In the embodiment, the airbag cover 6 is connected to the door portion 7 that can be opened when the airbag 31 is deployed and inflated, and the case 16 that is disposed so as to protrude downward from the peripheral edge of the door portion 7. Part 11. In the case of the embodiment, the storage portion is composed of the case 16 and the connection portion 11 that connects the case 16, and a portion near the upper end of the connection portion 11 forms the opening 11 c of the storage portion. .

  The door portion 7 is configured integrally with the upper panel 1a of the instrument panel 1 made of synthetic resin. In the case of the embodiment, the two door portions 7A and 7B having substantially the same width dimension in the front-rear direction are provided. The two are arranged side by side in the front-rear direction. The door portions 7A and 7B can be opened to both the front and rear sides with the end portions in the front and rear direction as hinge portions 9 and 9. In a portion excluding the hinge portion 9 around the door portions 7 </ b> A and 7 </ b> B, a substantially H-shaped breakable portion 8 as viewed from above is formed so as to cut out the back surface side.

  The connecting portion 11 is made of sheet metal and has a substantially rectangular tube shape protruding downward from the periphery of the door portion 7. And the connection part 11 is connected with door part 7A * 7B via the reinforcement part 13 fixed to the back surface side of door part 7A * 7B. Flange portions 12 </ b> A and 12 </ b> B are formed on the lower end sides of the wall portions 11 a and 11 b facing each other in the front-rear direction in the connecting portion 11 so as to protrude forward or rearward. Each of the flange portions 12A and 12B is for fixing the case 16, and includes a plurality of insertion holes 12a having nuts 12b fixed to the periphery. The reinforcing portion 13 is disposed from the upper end side of the wall portions 11a and 11b to the back surface side of the door portions 7A and 7B, respectively, and is disposed over substantially the entire area of the door portions 7A and 7B as shown in FIG. In addition, the width 13 in the left-right direction is reduced so that the portion 13a on the connecting portion 11 side (the portion near the hinge 9) can be easily bent and deformed when the door portions 7A and 7B are opened. ing. The reinforcing portion 13 is formed with a through-hole 13b into which the engaging portion 7a protruding from the back surface side of the door portion 7 can be inserted. In the airbag cover 6 of the embodiment, the engagement portion protruded from the through-hole 13b. The reinforcing portion 13 is fixed to the door portion 7 by melting and solidifying the front end of the stop portion 7a and performing heat caulking so that it cannot be removed from the through hole 13b.

  In the airbag apparatus M according to the embodiment, the connecting portion 11 and the case 16 as storage portions are arranged so that the axial direction intersects the upper surface 2 of the upper panel 1a with a small intersection angle. Yes. That is, in the airbag apparatus M of the embodiment, the storage portion is disposed to be inclined with respect to the bottom wall portion 19 of the case 16 so that the opening 11c is located on the vehicle rear side. Therefore, in the case of the embodiment, the distance from the upper surface of the folding completion body 49 accommodated in the case 16 to the opening 11c is set large. In particular, as shown in FIGS. 11b is set to have a large length dimension.

  The inflator 24 includes a substantially cylindrical main body portion 25 having a plurality of gas discharge ports 25 a and a flange portion 26 for attaching the inflator 24 to the case 16.

  The case 16 is formed in a substantially rectangular parallelepiped shape made of a sheet metal having an open upper end side, and extends upward from an outer peripheral edge of the bottom wall portion 19 and a substantially rectangular plate-shaped bottom wall portion 19 to which an inflator is inserted from below. And a peripheral wall portion 17 having a substantially square cylindrical shape. A flange portion 18 is formed on the upper end side of the rear wall portion 17a of the peripheral wall portion 17 so as to protrude rearward corresponding to the flange portion 12B of the connecting portion 11 described above. . The flange portion 18 is formed with an insertion hole 18a through which the bolt 21 can be inserted.

  In the vicinity of the center of the bottom wall portion 19, an insertion hole 19 a through which the main body portion 25 of the inflator 24 can be inserted is formed. In addition, brackets 20 and 22 are disposed in the vicinity of the left and right ends of the bottom wall portion 19 apart from the insertion hole 19a. The bracket 20 is disposed so as to protrude forward from the bottom wall portion 19 corresponding to the flange portion 12A in the connecting portion 11 described above, and the insertion hole through which the bolt 21 can be inserted at the distal end side. 20a. The bracket 22 is disposed so as to protrude rearward from the bottom wall portion 19 and is for fixing the case 16 to an instrument panel reinforcement (not shown) on the vehicle body side. In the case of the embodiment, the case 16 uses the bolt 21 to fix the flange portions 12A and 12B disposed on the airbag cover 6 to the flange portion 18 and the bracket 20, whereby the upper panel 1a of the instrument panel 1 is secured. The upper panel 1a is configured to be fixed to the vehicle body side using a bracket 22 disposed in the case 16 and a clip disposed at a predetermined position (not shown).

  The airbag 31 and the inflator 24 include a plurality of bolts 28 a of an annular retainer 28 disposed in the airbag 31, the airbag 31, the wrapping material 52, the case bottom wall portion 19, and the inflator 24. It is attached to the case 16 by passing through the flange portion 26 and being fastened with a nut 29.

  As shown in FIGS. 5 and 6, the airbag 31 has a shape at the time when the inflation and inflation are completed, and the occupant side wall 32 disposed along the substantially vertical direction on the occupant side, The inflator 24 has a shape including a peripheral wall portion 33 that narrows in a substantially conical shape on the front side, and an inflator 24 is introduced into a position on the lower side on the front end side of the peripheral wall portion 33 when the expansion is completed. A gas inflow port 34 that is opened in a substantially circular shape and that has a peripheral edge attached to the case 16 is disposed so that the main body 25 can be inserted. A plurality of attachment holes 35 for attaching the periphery of the inlet 34 to the bottom wall portion 19 of the case 16 through the bolt 28 a of the retainer 28 are formed at the periphery of the gas inlet 34. Vent holes 36 for exhausting excess inflation gas are disposed on the left and right side portions of the peripheral wall portion 33, respectively. In the airbag 31, a rectifying cloth 37 that covers the gas inlet 34 and rectifies the inflation gas flowing into the airbag 31 is disposed. Further, a reinforcing cloth 38 is disposed around the gas inlet 34.

  The airbag 31 is formed from a woven fabric woven from yarns such as polyester and polyamide. In the case of the embodiment, as shown in FIG. 7, the airbag 31 includes a first base fabric 39 that constitutes the passenger side wall portion 32, a second base fabric 40 that constitutes the peripheral wall portion 33, and a rectifier that constitutes the rectifying fabric 37. The cloth material 41 is formed, and the flow straightening cloth material 41 is sewn to the second base cloth 40 to which the reinforcing cloth 38 has been sewn in advance to form the flow straightening cloth 37. The peripheral edges of the first and second base fabrics 39 and 40 are manufactured by sewing together.

  The airbag 31 is provided with a wrapping material 52 around a folded body 49 having a substantially rectangular parallelepiped shape formed by folding the retainer 28 therein and projecting the bolt 28a from the mounting hole 35. It is configured to be housed in the case 16 in the state of the winding completion body 69 having a substantially rectangular parallelepiped shape. In the example shown in the drawing, there is a gap between the folding completion body 49 and the wrapping material 52, or between the winding completion body 69 and the case 16, but in an actual product, the winding completion body is described. 69 is housed in the case 16 with almost no gap around it.

  Similar to the airbag 31, the wrapping material 52 is formed from a woven fabric woven from yarns such as polyester and polyamide, and is configured to cover the entire periphery of the folding completion body 49 over the entire surface. In the case of the embodiment, the wrapping material 52 includes, as shown in FIG. 4, an insertion hole 54 through which the main body 25 of the inflator 24 can be inserted and a through hole 55 through which the bolt 28 a of the retainer 28 can be inserted. Provided, and is configured in a substantially cross-shaped shape extending from the insertion hole 54 to the front, rear, left and right.

  The wrapping material 52 includes an insertion hole 54 and a through hole 55 and is disposed so as to cover the lower surface side of the folding completion body 49 and is fixed to the case 16 side. A first protection part 57 as a protection part arranged to extend rearward via the side part 56 and a presser part arranged to extend forward from the front edge side of the attachment part 53 via the front part 59. And the left and right side portions 65 and 66 disposed so as to extend from the left and right edge sides of the mounting portion 53 to the left and right sides. The rear side portion 56 is a portion that is disposed between the attachment portion 53 and the first protection portion 57 and covers the rear side of the folding completion body 49, and the front side portion 59 is the attachment portion 53 and the second protection portion. It is a part which is arrange | positioned between 60 and covers the front side of the folding completion body 49. FIG. Further, the left and right side portions 65 and 66 cover the left and right sides of the folding completion body 49, and when the airbag 31 is deployed and inflated, the front ends 65a and 66a are projected from the case opening 16a so that the case peripheral wall 17 From the inner peripheral surface side of the left and right wall portions to the inner peripheral surface side of the left and right wall portions of the connecting portion 11, it can be covered.

  The first protection part 57 covers the upper side of the folding completion body 49 and, at the time of deployment and inflation of the airbag 31, the base part side (base end 57b side) so that the front end 57a side protrudes from the opening 11c of the storage part. Of the door portion 7B opened so as to be reversed from the inner peripheral surface side of the rear wall portion 17a in the case peripheral wall portion 17 through the inner peripheral surface side of the rear wall portion 11b in the connecting portion 11. It is a portion that is disposed so as to cover the entire upper surface side and protects the airbag 31 from the door portion 7B. And the 1st protection part 57 will be arrange | positioned above the folding completion body 49 in the state which has arrange | positioned the folding part 58 at the front-end | tip 57a side. In addition, the first protective portion 57, when unfolded, sets the distance from the base end 57b to the tip end 57a, that is, the length dimension L1 in the front-rear direction (see FIG. 4), and the width dimension W1 in the front-rear direction of the folded body 49. It is set larger than (see FIG. 3).

  The folding part 58 is formed by bellows folding that is folded with a fold along the left-right direction so as to reduce the width dimension of the first protection part 57 in the front-rear direction. In the case of the embodiment, the folding portion 58 is configured with two folds so that the front end 57 a of the first protection portion 57 is positioned on the front edge side of the folding completion body 49. Further, the folding part 58 has a length dimension L2 from the rear edge side of the folding part 58 in the first protection part 57 to the base end 57b, from the base end 57b when the case 16 is stored to the hinge part 9 in the door part 7B. It is arranged so as to be larger than the distance L3 (see FIG. 3).

  The second protection part 60 is provided as a pressing part that presses the upper side of the first protection part 57 when the second protection part 60 is provided around the folding completion body 49, and the storage part when the airbag 31 is deployed and inflated. This is a part that also serves as a protective part that covers the inner peripheral surfaces of 11 and 16 and the upper surface of the door part 7A. The second protection part 60 includes a main body part 61, a locking part 62 that is disposed on the tip 61 a side of the main body part 61 and locks the second protection part 60 using the bolt 28 a of the retainer 28, and the main body part 61 and a planned fracture portion 63 disposed between the locking portion 62 and the locking portion 62. The locking portion 62 includes two through holes 62 a into which the bolts 28 a of the retainer 28 protruding from the folding completion body 49 can be inserted. The planned break portion 63 is configured by arranging a linear slit 63a substantially along the left-right direction, and can be broken at the initial stage of inflation of the airbag 31 to separate the locking portion 62 and the main body portion 61 from each other. It is configured.

  The main body portion 61 is disposed above the first protection portion 57, covers the upper side and the rear side of the folding completion body 49, and the front end 61a side of the case opening 16a when the airbag 31 is deployed and inflated. The door portion 7A is opened so as to be inverted from the inner peripheral surface side of the front wall portion 17b of the case peripheral wall portion 17 through the inner peripheral surface side of the front wall portion 11a of the connecting portion 11 It is set as the structure which can cover over the whole upper surface side. And the 2nd protection part 60 makes the main-body part 61 arrange | position above the 1st protection part 57, and makes the bolt 28a of the retainer 28 the insertion hole 62a formed in the latching | locking part 62 at the front-end | tip 61a side. The engaging part 62 is engaged with the retainer 28 by being inserted, and the folding part 58 is pressed from above so that the folded shape of the folding part 58 in the first protection part 57 can be maintained. In the embodiment, the main body 61 has the front end 61 a side where the locking portion 63 is disposed positioned on the rear side of the folding completion body 49, and the rear wall portion 17 a and the first protection in the case peripheral wall portion 17. The main body portion 61 is accommodated in the case 16 so as to be disposed between the cloth 57 and the main body portion 61 when the airbag 31 is deployed and inflated. Is pushed out by the airbag 31 and pulled out from between the rear wall portion 17a and the first protection portion 57, and protrudes from the openings 11c of the storage portions 11 and 16 without hindering the deployment of the airbag 31. It will be.

  Next, the assembly of the airbag apparatus M according to the embodiment will be described. First, the retainer 28 is placed in the airbag 31 so that each bolt 28a protrudes from the mounting hole 35, and the airbag 31 is folded horizontally. Fold through the vertical folding process.

  In the case of the embodiment, the airbag 31 is folded through a preliminary folding airbag 43 as shown in FIG. The pre-folded airbag 43 is formed in a shape that is overlapped and flattened from above so that the occupant side wall 32 is positioned on the rear side of the gas inlet 34. Specifically, the pre-folded airbag 43 is folded with the valley wall folds CH, CL, CR along the front-rear direction or the left-right direction on the peripheral wall portion 33, and the substantially entire area of the passenger side wall portion 32 is flattened. It is formed to expand.

  Then, the pre-folded airbag 43 formed in this way is folded through a horizontal folding process and a vertical folding process. First, as shown in FIG. 8B and FIG. 9A, the portion 44 on the rear side of the gas inlet 34 is rolled and folded so that the rear end 44a is wound around the peripheral wall portion 33 side and placed on the passenger side wall portion 32 side. 9B, the portion 45 on the front side of the gas inlet 34 is folded so that the front end 45a approaches the gas inlet 34 and is placed on the roll-folded rear portion 44. The horizontal folding process is completed.

  After side folding, the portions 46 and 47 on both the left and right sides of the gas inlet 34 are folded along the front-rear direction as shown in FIGS. 9B and 9C so that the end portions 46a and 47a approach the gas inlet 34. As described above, the folding completed body 49 can be formed by performing vertical folding.

  Thereafter, the wrapping material 52 is arranged around the folding completion body 49. Specifically, as shown in FIG. 10A, the folding completion body 49 is placed on the attachment portion 53 of the lapping material 52 that is flatly spread so that the bolt 28 a protrudes from the through hole 55. Next, the ends 65a and 66a are placed on the upper surface side of the folding completion body 49 so that the left and right portions 65 and 66 respectively cover the left and right sides of the folding completion body 49 (see FIG. 10B). Thereafter, as shown in FIG. 10C, the first protection portion 57 is placed on the upper surface side of the folding completion body 49 so as to cover the upper side of the folding completion body 49, and the portion on the tip 57 a side is aligned along the left-right direction. The folds 58 are formed by folding the folds (see FIGS. 11A and 11B). And the 2nd protection part 60 is mounted in the upper surface side of the 1st protection part 57 so that the upper side of the folding completion body 49 may be covered, and as shown to FIG. 11C, it forms in the latching | locking part 62 at the front-end | tip 60a side. If the bolt 28a of the retainer 28 is inserted into the through-hole 62a to be formed, the winding completion body 69 can be formed.

  Next, each bolt 28a is protruded from a through hole (not shown) in the case bottom wall portion 19 so that the winding completion body 69 is placed on the case bottom wall portion 19, and the main body portion 25 of the inflator 24 is further moved. From below, the bolts 28a are inserted in the flange portion 26 of the inflator 24 by being inserted into the insertion hole 19a of the bottom wall portion 19, the insertion hole 54 of the wrapping material 52, and the gas inlet 34 of the airbag 31. It protrudes from the hole (not shown). Then, the nut 29 is screwed into each bolt 28 a and the airbag 31 and the inflator 24 are assembled to the case 16.

  Thereafter, the flange portion 18A and the bracket 20 of the case 16 are made to correspond to the flange portions 12A and 12B of the connecting portion 11, the bolts 21 are fixed, and the upper panel 1a including the airbag cover 6 is assembled to the case 16. If the case 16 is fixed to the vehicle body side using the bracket 22 and the lower panel 1b of the instrument panel 1 is attached, the passenger seat airbag device M can be mounted on the vehicle.

  If the inflation gas is discharged from the gas discharge port 25a of the inflator 24 after the airbag device M is mounted on the vehicle and the vehicle collides with the front, the airbag 31 expands and the rupture planned portion 63 of the wrapping material 52 is expanded. As shown in FIG. 2, the door portions 7A and 7B of the airbag cover 6 are pushed and opened. Then, the airbag 31 is expanded and inflated so as to protrude rearward and upward from the opening 11c of the storage portions 11 and 16 formed by opening the door portions 7A and 7B, and the two-dot chain line in FIG. As shown in FIG. 13, the expansion is completed.

  In the airbag apparatus M for the passenger seat according to the embodiment, the wrapping material 52 that covers the periphery of the folding completion body 49 accommodated in the case 16 over the entire circumference covers the front end 57a side in the initial stage of inflation of the airbag 31. It is developed so as to protrude above the opening 11c of the storage portions 11 and 16, and can cover almost the entire surface from the inner peripheral surface side of the storage portions 11 and 16 to the upper surface side of the door portion 7B that is opened. It is the structure provided with the 1st protection part 57 comprised. That is, in the airbag apparatus M of the embodiment, the first protection part 57 of the wrapping material 52 protrudes from the opening 11c of the storage part in the initial stage of the inflation of the airbag 31, and the inside of the rear wall part 17a in the case peripheral wall part 17 From the peripheral surface side, through the inner peripheral surface side of the rear wall portion 11b in the connecting portion 11, the upper surface side of the door portion 7B opened so as to be reversed is unfolded so as to cover substantially the entire surface.

  Further, in the airbag apparatus M of the embodiment, the first protective part 57 that covers the upper surface side of the opened door part 7B has a length dimension L1 developed from the base end 57b to the front end 57a on the base part side of the door part 7B. Is set to be larger than the width dimension W1 in the front-rear direction of the folding completion body 49, but the front end 57a of the first protection part 57 is located between the folding completion body 49 and the case 16 when stored in the case 16. The front end 57a side is pressed by the second protection part 60 as a pressing part, and is not above the folding completion body 49. The folding completion body 49 and the door portion 7A. It is the structure arrange | positioned so that it may be located in the range which becomes between 7B. Therefore, after the main body portion 61 in the second protection portion 60 is pushed by the airbag 31 and pulled out from between the rear wall portion 17a and the first protection portion 57, the first protection portion 57 is removed. The air bag 31 can be reliably projected together with the air bag 31 without hindering the deployment of the air bag 31, and when the air bag 31 is deployed and inflated, the inner peripheral surface of the housing portion (the case peripheral wall portion 17). The inner peripheral surface of the rear wall portion 17a and the inner peripheral surface of the rear wall portion 11b of the connecting portion 11 and the upper surface of the door portion 7B are covered with the first protective portion 57, and the airbag expands and inflates. 31 can be protected from the inner peripheral surface of the rear wall portion 17a in the case peripheral wall portion 17, the inner peripheral surface of the rear wall portion 11b in the connecting portion 11, and the upper surface of the door portion 7B. As a result, as in the embodiment, in the passenger seat airbag apparatus M, the storage portion (the case 16 and the connecting portion 11) is made of sheet metal, and the sheet metal is disposed on the back side of the door portion 7B. However, since the airbag 31 that is deployed and inflated can be protected from the surrounding door portion 7B and the storage portions 11 and 16, the airbag 31 interferes with the surrounding door portion 7B and the storage portions 11 and 16. Therefore, the airbag 31 can be prevented from being damaged, and the airbag 31 can be smoothly deployed and inflated.

  Therefore, in the airbag device M for the passenger seat according to the embodiment, the airbag 31 that is deployed can be protected from the storage portions 11 and 16 and the airbag cover 6 that are disposed around the airbag 31. Can be inflated.

  Further, in the airbag device M of the embodiment, the second protective portion 60 as the presser portion is configured to be able to cover the upper surface side of the opened door portion 7A, and when the airbag 31 is deployed and inflated, the case peripheral wall The inner peripheral surface of the front wall portion 17 b in the portion 17, the inner peripheral surface of the front wall portion 11 a in the connecting portion 11, and the upper surface of the door portion 7 </ b> A are covered with the main body portion 61 of the second protection portion 60. Become.

  Furthermore, in the airbag apparatus M of the embodiment, the first protection part 57 is provided with a folding part 58 that is folded so that the part on the tip 57a side that covers the upper surface side of the opened door part 7B is folded. The length L2 from the base end 57b to the folding part 58 in the first protective part 57 is set to be the upper part of the completed body 49, and the length L2 from the base end 57b to the hinge part 9 of the door part 7B. Since the configuration is set to be larger than the distance L3, the folded portion 58 can be reliably projected from the opening 11c of the storage portion in the initial stage of inflation of the airbag 31. That is, in the airbag apparatus M of the embodiment, at the initial stage of inflation of the airbag 31, the folding portion 58 is placed between the airbag 31 that is inflated and the inner peripheral surface of the connecting portion 11 as shown in FIG. Since it can be made to protrude from the opening 11c without being pinched, the door part 7B can be covered reliably when the airbag 31 is deployed and inflated.

  In the airbag apparatus M of the embodiment, as shown in FIG. 12, when the folding part 58 of the first protection part 57 protrudes from the opening 11c, the tip 57a is separated from the opened door part 7B side. It folds and arrange | positions so that it may arrange | position in the position, ie, the position most distant from the base end 57b. Therefore, when the folding part 58 cancels the folding, the front end 57a is not likely to be caught by the reinforcing part 13 disposed on the upper surface side of the opened door part 7B, and the folding part 58 is smoothly deployed. be able to. Of course, when the above points are not taken into account, the folding part may be folded so that the front end is directed to the open door side. Further, as shown in FIG. 14, the front end 57a side of the first protective part 57 is roll-folded so as to be wound toward the folding completion body 49 side to form a folding part 58A, or the front end 57a is folded back. The folded portion 58B may be configured by folding the bellows so as to face the 49 side. Since the folding parts 58A and 58B are arranged on the folding completion body 49 side, they are arranged on the upper surface side of the base part side part of the first protection part 57 at the time of unfolding. Interference with the door portion 7B can be suppressed.

  In the embodiment, the second protective part 60 is used as a presser part that presses the folded portion 58 of the first protective part 57, but the second protective part may not be used as the presser part. For example, it is good also as a structure which presses a folding site | part using the separate tape material etc. which fracture | rupture at the time of expansion | deployment of an airbag.

  In the embodiment, the airbag apparatus using the airbag cover 6 having the configuration including the two door portions 7A and 7B having substantially the same width dimension in the front-rear direction has been described as an example. This is not the only airbag device that can be applied to an airbag cover having two door portions with different width dimensions in the front-rear direction and a single-door type airbag cover. The invention may be applied. Of course, the opening direction of the door portion is not limited to the front-rear direction, and an airbag cover having a type of door portion that opens in the left-right direction may be used.

1 is a perspective view showing an instrument panel in which a passenger seat airbag device according to an embodiment of the present invention is mounted. It is a schematic longitudinal cross-sectional view which shows the vehicle mounting state of the airbag apparatus for passenger seats of embodiment, and respond | corresponds to the II-II site | part of FIG. It is a general | schematic expanded longitudinal cross-sectional view of the airbag apparatus for passenger seats of embodiment. It is a top view of the wrapping material used for the airbag apparatus for passenger seats of an embodiment. It is a perspective view of the state where the air bag used for the passenger's seat air bag device of an embodiment was inflated alone. It is sectional drawing of the vehicle front-back direction of the state which expanded the airbag of embodiment alone. It is a top view which shows the member which comprises the airbag of embodiment. It is a figure explaining the folding process of the airbag of an embodiment. It is a figure explaining the folding process of the airbag of embodiment, and shows the process after FIG. It is a figure explaining the winding operation | work of the wrapping material around a folding completion body. It is a figure explaining the winding operation | work of the wrapping material around a folding completion body, and shows the process after FIG. It is a schematic sectional drawing explaining the expansion | swelling expansion state in the expansion | swelling initial stage of the airbag apparatus of embodiment. In the airbag apparatus of embodiment, it is a schematic sectional drawing of the state which the airbag completed inflation. It is a general | schematic expanded longitudinal cross-sectional view which shows the airbag apparatus of other embodiment.

Explanation of symbols

1 ... Instrument panel (instrument panel),
6 ... Airbag cover,
7 (7A, 7B) ... door part,
11 ... connection part (storage part),
11c ... opening,
16: Case (storage part),
24 ... Inflator,
31 ... Airbag,
49 ... Folded body,
52 ... Wrapping material,
57 ... 1st protection part (protection part),
57a ... tip,
58.58A ... Folding part,
60 ... second protection part (presser part),
M ... Airbag device for passenger seat.

Claims (2)

Located in the instrument panel in front of the passenger seat of the vehicle,
An airbag that is folded and stored, a storage portion that stores the airbag and that opens at the upper end side, and is disposed so as to cover the opening of the storage portion and can be opened when the airbag is deployed and inflated An airbag cover having a door portion configured,
The airbag is configured to be folded into a folded complete body and to be stored in the storage portion with a wrapping material for preventing collapse so as to cover the entire surface of the folded complete body. In the passenger airbag device,
The wrapping material is
At the initial stage of inflation of the airbag, the front end side is deployed so as to protrude upward from the opening of the storage portion and is inverted from the inner peripheral surface side of the storage portion. A protective portion that is disposed so as to cover substantially the entire surface over the upper surface side of the door portion that is open, and protects the airbag from the door portion;
When the wrapping material is disposed around the folding completion body, the pressing portion is disposed so as to be capable of pressing the protective portion toward the folding completion body side;
Is configured to include,
The protective part is
The unfolded length dimension from the base end to the distal end of the position on the base side that becomes the rotation center when the door is opened is the width dimension in the direction along the opening direction of the door on the upper surface of the folded body. Is set larger than
When stored in the storage portion, the tip side is held by the pressing portion and is above the folding completion body and within the range between the folding completion body and the door portion. An airbag device for a passenger seat, wherein the airbag device is folded and disposed so as to be positioned on the passenger seat. The protective part is provided on the upper side of the folding completion body by providing a folded part that is folded so as to fold the part on the tip side that covers the upper surface side of the opened door part,
The length dimension from the base end to the folding part on the front end side in the protection part is set to be larger than the distance from the base end to the base part that is the rotation center when the door part is opened. The airbag device for a passenger seat according to claim 1.

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