JP2014196063A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device having good workability in inserting an inflator into an insertion opening of an air bag, and good sealing properties of the insertion opening.SOLUTION: An inflator 43 is mounted on a case 27 together with an air bag 53 using mounting means 67 projected from an air bag 63 while the inflator is inserted into the air bag 63 through an insertion opening 66 so as to project one end side of the inflator to the outside of the air bag 63. The air bag 63 includes a bag body 64 having an insertion opening 66, and an almost cylindrical seal tube 72 extending to the inside of the bag body 64 from the periphery of the insertion opening 66. The seal tube 72 is set to have an inner diameter through which the inflator 43 can be inserted, and also is in contact with an outer peripheral surface 45b of the inflator 43 over the whole periphery by expansion gas G flowing into the air bag 63 when operating the inflator 43, and the periphery of the insertion opening 66 is set to be sealed.

Description

  The present invention relates to an airbag device that is mounted on a vehicle and includes an airbag and an inflator that supplies inflation gas to the airbag. Specifically, the inflator can discharge inflation gas to one end side. The air outlet is arranged in a substantially cylindrical shape with the other end protruding outside the airbag and inserted into the airbag through an insertion opening formed in the airbag. The present invention relates to an airbag device suitable for a knee protection airbag device capable of protecting the occupant's knee, a side impact airbag device capable of protecting the occupant's chest, and the like.

  In this type of airbag device, the inflator is housed in the airbag so that the attachment means protrudes outside the airbag, and the inflator and the airbag are attached by attaching this attachment means to the attachment site. It was the structure attached to the site | part. Conventionally, as an airbag device of this type, there has been one in which an opening for insertion is formed as a slit having a width dimension in which an inflator can be inserted in a base material constituting the airbag (for example, a patent) Reference 1).

  In addition, as an airbag device, an insertion opening for inserting an inflator formed in an airbag is formed in a double-layered base material with a slit in a cross shape, and the slit is aligned with the center. There existed the thing of the structure arrange | positioned so that it might shift along the circumferential direction (for example, refer patent document 2).

  Furthermore, as an airbag apparatus, the part which attaches an inflator in the vehicle body side wall part of an airbag is made into two sheets by applying a cloth, and the slit along a front-back direction is made into the vehicle body side wall part and the cloth, respectively, A cylinder that is formed at a position shifted on the direction side, and the side walls of the vehicle body and the covering cloth are sewn with sutures so that the ends of the slits are linearly connected to each other, and both ends are opened. There is a configuration in which an inflator is inserted into the cylindrical portion (see, for example, Patent Document 3).

JP 2006-321331 A JP 2010-149690 A JP 2005-82025 A

  However, in the airbag device described in Patent Document 1, since the inflator is inserted by setting the opening width dimension of the slit-shaped insertion opening as small as possible, the insertion device is used when the airbag is deployed and inflated. Although it is possible to prevent gas leakage from the gap between the opening and the inflator as much as possible, it is necessary to insert the inflator into the airbag so as to push the slit-shaped insertion opening and insert the inflator into the airbag. The workability when doing so was not good. Therefore, there is room for improvement in that the workability of inserting the inflator into the airbag is improved.

  Also, in the airbag device described in Patent Document 2, since the insertion opening is formed by forming a cross-shaped slit in the base material, the opening width dimension of the slit is set as small as possible. By doing so, it is possible to prevent gas leakage from the gap between the insertion opening and the inflator as much as possible, but it is necessary to insert the inflator into the airbag so that the insertion opening is widened. In the airbag apparatus described in the above, since the insertion opening is formed in a portion where the two base materials are stacked, the insertion work is not easy, and the workability when inserting the inflator into the airbag is good. There was room for further improvement.

  Furthermore, in the airbag device described in Patent Document 3, a vehicle body side wall portion and a cover cloth that are arranged as two sheets are partially sewn to form a tubular shape, and an inflator is inserted into the tubular portion. By doing so, it is configured to cover the outer peripheral side of the inflator with this cylindrical part, but since this cylindrical part is configured partly from the vehicle body side wall itself, when the airbag is inflated, In this cylindrical part, the part constituted by the side wall part of the vehicle body is pushed by the inflation gas as the airbag is inflated, and it is inevitable that the part is separated from the outer peripheral surface of the inflator, and the sealing property Was not good.

  The present invention solves the above-described problems, and an object of the present invention is to provide an airbag device in which the workability of inserting an inflator into an insertion opening is good and the sealing performance of the insertion opening is also good. .

An airbag device according to the present invention is a bag-shaped bag made of a flexible base material, and an airbag that is folded and stored;
The outer shape is generally columnar, and a gas discharge port that can discharge inflation gas is provided on one end side, and the other end side is formed on the airbag from the gas discharge port side so that it protrudes outside the airbag. An inflator that is attached to the attachment site together with the airbag, using an attachment means that protrudes from the airbag in a state of being inserted into the airbag through the insertion opening to be made;
In an airbag device configured to include:
A bag body having an insertion opening formed so that the air bag is cut out of the base material so that the inflator can be inserted;
A substantially cylindrical seal tube formed of a flexible substrate and formed to extend from the periphery of the insertion opening into the bag body;
Is configured to include,
The inner diameter of the seal tube is set so that the inflator can be inserted, and when the inflator is activated, the inflating gas that has flowed into the airbag is pressed against the outer peripheral surface of the inflator over the entire circumference, thereby opening the insertion tube. The peripheral edge is configured to be sealable.

  In the airbag device of the present invention, the airbag has a configuration in which a seal tube extending into the bag body is disposed at the periphery of the opening for insertion formed in the bag body, and the inflator is passed through the insertion opening to form a gas. It is configured to be inserted into the air bag while being inserted into the seal tube from the other end side, which is the discharge port side, with one end side protruding from the insertion opening. That is, in the airbag device of the present invention, the seal tube is housed in the airbag, attached to the attachment site, covers the outer periphery of the inflator, and is fixed to the inflator. Therefore, when the bag body is deployed and inflated, the seal tube can be prevented from moving away from the inflator due to the influence of the expanding bag body. The internal pressure of the inflation gas discharged from the inflator can be received and brought into pressure contact with the outer peripheral surface side of the inflator. Therefore, the outer peripheral surface of the inflator can be covered with a seal tube without a gap, and gas leakage from between the insertion opening and the inflator can be prevented as much as possible. Further, in the airbag device of the present invention, since the seal tube is pressed against the outer peripheral surface of the inflator using the pressing force of the inflation gas, the entire seal tube having a predetermined length is secured to the inflator. If it is possible to press contact to the outer peripheral surface side, gas leakage can be prevented without any trouble even if the inner diameter dimension of the seal tube is set larger than the outer diameter dimension of the inflator. Therefore, by setting the inner diameter dimension of the seal tube to be larger than the outer diameter dimension of the inflator, the operation of inserting the inflator into the airbag can be facilitated.

  Therefore, in the airbag device of the present invention, the workability of inserting the inflator into the insertion opening is good, and the sealing performance of the insertion opening is also good.

  Further, in the airbag device of the present invention, if a part of the seal tube is configured to be fastened together with the bag body and the inflator together with the attachment site using the inflator mounting means protruding from the bag body, the seal tube However, since a part of the seal tube is disposed between the bag body and the inflator and disposed in the bag body, when the bag body is expanded and inflated, the sealing tube is caused by the inflation gas flowing in the bag body. It is preferable that it can be prevented from rolling up, and the entire seal tube can reliably cover the outer peripheral side of the inflator.

Furthermore, in the airbag device having the above-described configuration, the inflator is configured to include an inflator body having a gas discharge port capable of discharging an inflating gas, and a retainer that holds the inflator body and is attached to an attachment site.
The retainer comprises a substantially cylindrical holding part into which the inflator main body can be inserted from the gas discharge port side, and mounting means arranged so as to protrude from the holding part,
It is preferable that the holding portion is configured to be provided with a pressure contact opening that allows the sealing tube to be in pressure contact with the outer peripheral surface of the inflator main body when the bag main body is inflated to seal the periphery of the insertion opening.

  If the airbag device has the above-described configuration, the inflator body is inserted into the retainer through the insertion opening and the retainer is folded in a state in which the retainer is previously accommodated therein, and is held by the retainer. If so, the inflator can be stored inside the airbag. Therefore, it is easy to perform the folding operation of the airbag and the storing operation of the inflator body in the airbag in different places. The inflator main body can be transported to another place and handled with care. Further, in the airbag device having the above-described configuration, the inflator is configured to include the inflator body and the retainer, and the inflator body is disposed in the bag body while being held by the holding portion of the retainer. At the time of expansion, the seal tube is directly pressed against the outer peripheral surface of the inflator body by receiving the pressing force of the expansion gas so as to be pushed into the pressure contact opening formed in the holding portion. Therefore, even if the inflator is configured to include the inflator body and the retainer, gas leakage from between the inflator body and the insertion opening can be accurately prevented.

It is a schematic longitudinal cross-sectional view of the vehicle front-back direction which shows the use condition of the airbag apparatus for knee protection which is one Embodiment of this invention. It is a general | schematic expanded longitudinal cross-sectional view of the vehicle front-back direction of the airbag apparatus for knee protection of embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic transverse cross-sectional view of a knee protecting airbag device of an embodiment in the vehicle left-right direction. It is the schematic front view seen from the vehicle back side which shows the use condition of the airbag apparatus for knee protection of embodiment. It is the perspective view which looked at the case used for the airbag apparatus for knee protection of an embodiment from the vehicles front side. It is a right view of the case of FIG. FIG. 6 is a partial enlarged cross-sectional view of the case of FIG. 5. It is a perspective view of the retainer used for the airbag apparatus for knee protection of embodiment. It is sectional drawing of the IX-IX site | part of FIG. It is a rear view of the airbag used for the airbag apparatus for knee protection of embodiment. FIG. 11 is a partially enlarged view showing a part of an insertion opening and a seal tube in the airbag of FIG. 10. It is an expanded sectional view of the XII-XII part of FIG. It is an expanded sectional view of the XIII-XIII part of FIG. It is an expanded sectional view of the XIV-XIV site | part of FIG. In the airbag of FIG. 10, it is the top view which put in order the base fabric for seal tubes which comprises a seal tube, and the site | part of the opening opening periphery of the vehicle body side wall part in a bag main body. FIG. 11 is a partially enlarged schematic perspective view showing the vicinity of a seal tube in the airbag of FIG. 10. In the knee protection airbag device of the embodiment, it is a schematic partial enlarged cross-sectional view showing a portion of a seal tube when the airbag is inflated. In the knee protection airbag device of the embodiment, it is a schematic partially enlarged longitudinal sectional view showing a portion of a seal tube when the airbag is inflated.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, a knee protection airbag device will be described as an example of the airbag device.

  The knee protection airbag device (hereinafter abbreviated as “airbag device”) S according to the embodiment can protect the knee K (KL, KR) of the driver D as an occupant as shown in FIGS. Further, the vehicle is disposed below the steering column 8 on the vehicle front side of the driver D. In addition, the top and bottom, left and right, and front and rear in the present specification correspond to the vertical and horizontal and front and rear directions of the vehicle when the airbag device S is mounted on the vehicle.

  As shown in FIGS. 1 and 4, the steering column 8 includes a column main body 9 and a column cover 12 that covers the outer peripheral side of the column main body 9. As shown in FIG. 1, the column body 9 includes a main shaft 10 and a column tube 11 that covers the periphery of the main shaft 10.

  1-3, the airbag apparatus S stores the folded airbag 63, the inflator 43 that supplies the inflation gas to the airbag 63, and the folded airbag 63 and the inflator 43. In addition, a case 27 having a vehicle rear side opened and an airbag cover 17 covering the vehicle rear side of the projecting opening 27a in the case 27 are provided.

  The airbag cover 17 is formed from a thermoplastic elastomer such as polyolefin, and is configured to cover the vehicle rear side of the case 27. As shown in FIGS. 2 and 3, the airbag cover 17 is disposed on the lower panel 13 b side of an instrument panel (hereinafter abbreviated as “instrument panel”) 13 including an upper panel 13 a and a lower panel 13 b. In the case of the embodiment, the airbag cover 17 includes a door disposition portion 18 disposed in the vicinity of the projecting opening 27 a of the case 27, and a peripheral edge portion 25 extending around the door disposition portion 18. Yes.

  The door arrangement portion 18 includes a door portion 19 that covers the protrusion opening 27 a of the case 27, attachment pieces 22 and 23 that extend forward from both upper and lower sides of the door portion 19 and attach the airbag cover 17 to the case 27. It is equipped with. The door portion 19 is formed to be slightly larger than the protrusion opening 27a of the case 27, and has a substantially rectangular plate shape that covers the vehicle rear side of the protrusion opening 27a. In the embodiment, as shown in FIG. 4, the door portion 19 is disposed around the thinly-scheduled breaking portion 20 that is substantially H-shaped when viewed from the vehicle rear side, and is opened at both the upper and lower ends. A hinge portion 21 serving as a center of rotation at the time is disposed and configured to open to both the upper and lower sides when opened. As shown in FIG. 2, the attachment pieces 22 and 23 are arranged on the outer peripheral side of an upper side wall 32 and a lower side wall 33 (described later) of the case 27 so as to protrude adjacent to the front side of the vehicle. In the front end side, the locking holes 22a and 23a opened in a rectangular shape for locking the locking claws 32a and 33a formed in the case 27 correspond to the locking claws 32a and 33a, respectively. These are arranged at four locations along the left-right direction.

  The peripheral edge portion 25 is configured as a stepped shape that is recessed from the door portion 19 to the front side of the vehicle at the left and right side portions of the door arrangement portion 18, and the portions disposed on the left and right sides of the door portion 19 in the lower panel 13 b. The vehicle rear side surfaces of the door portion 19 and the lower panel 13b are substantially flush with each other (see FIG. 3).

  The case 27 is made of sheet metal. As shown in FIGS. 5 to 7, as shown in FIGS. 5 to 7, a substantially rectangular bottom wall 28 disposed on the front side of the vehicle, and substantially along the front-rear direction from the periphery of the bottom wall 28. And a substantially rectangular tube-shaped peripheral wall portion 31 that extends in the form of a box. The rear end side of the peripheral wall portion 31 has a substantially box-like shape with a protrusion opening 27a from which the airbag 63 can protrude.

  The bottom wall portion 28 is formed in a substantially rectangular plate shape that is wide on the left and right sides. In the case of the embodiment, the bottom wall portion 28 constitutes a mounting portion to which the inflator 43 and the airbag 63 are attached, and is arranged on a retainer 52 described later of the inflator 43. The insertion holes 28a for inserting the provided bolts 59 are arranged at two locations along the left-right direction. Further, in the bottom wall portion 28, at a position that is substantially in the middle between the insertion holes 28 a and 28 a, it protrudes inside the case 27 (on the inflator 43 side and the vehicle rear side) substantially along the protruding direction of the bolt 59. As described above, the support protrusion 29 is formed. The support protrusion 29 has a substantially frustoconical outer shape, and when mounted on a vehicle, as shown in FIG. 3, a substantially flat tip portion 29 a is used as a main body of an inflator main body 44 described later in the inflator 43. The inflator main body 44 can be supported by contacting the outer peripheral surface 45 b of the portion 45. In the case of the embodiment, the support protrusion 29 is formed at the approximate center of the bottom wall 28 in the vertical and horizontal directions.

  The peripheral wall portion 31 includes an upper side wall 32 and a lower side wall 33 that face each other in the vertical direction, and a left side wall 34 and a right side wall 35 that face each other in the left and right direction. In the vicinity of the rear end of the upper side wall 32 and the lower side wall 33, locking claws 32a, 33a for locking the peripheral edges of the locking holes 22a, 23a formed in the attachment pieces 22, 23 of the airbag cover 17, It protrudes outward in the vertical direction and is bent and formed into a substantially L-shaped cross section so that the tip is directed to the front side of the vehicle. The locking claws 32a and 33a are formed on the upper side wall 32 and the lower side wall 33 at four locations along the left-right direction, respectively.

  In the case of the embodiment, the right side wall 35 is, as shown in FIG. 7, between a base side portion 35 a and a tip side portion 35 b arranged along the front-rear direction in a cross section substantially along the horizontal direction. The inclined portion 35c that is inclined with respect to the front-rear direction is disposed and formed in a stepped shape. Specifically, the inclined portion 35c is inclined so that the rear end side, which is the tip side portion 35b side, is directed outward, and the front end side, which is the base portion side portion 35a side, is directed inward.

  As shown in FIGS. 6 and 7, the right side wall 35 is formed with an insertion hole 36 for exposing a connection port portion 48 to be described later of the inflator main body 44 in a state where the inflator 43 is attached to the case 27. . The insertion hole 36 includes a substantially semicircular hole main body 37 formed in a region from the base portion side portion 35a to the front half of the inclined portion 35c, and a rear half portion of the inclined portion 35c to the tip side portion 35b. 6 having a substantially rectangular auxiliary opening 38 formed in the region, and as shown in FIG. 6, the outer shape viewed from the right side is narrow on the rear side (projecting opening 27a side). It has a mushroom shape. The hole body 37 is sized such that only the connection port 48 can be inserted and the inflator body 44 itself cannot be inserted, and the auxiliary opening 38 has an opening width dimension that allows the connection port 48 to be inserted. Set to dimensions. In the case of the embodiment, with the inflator 43 attached to the case 27, the portion near the boundary portion between the auxiliary opening 38 and the hole body 37 is viewed from the right side and the periphery of the connection port portion 48 of the inflator body 44. This region has a region overlapping the right end surface 45a (see FIG. 6), and the portion in the vicinity of the boundary portion serves as the presser portion 39 to prevent the inflator body 44 from coming off from the insertion hole 36.

  Mounting brackets for attaching the case 27 to the body 1 side of the vehicle, as shown in FIG. 5, on the left and right ends of the upper side wall 32 and the left and right ends of the lower wall 33 in the peripheral wall portion 31 of the case 27 of the embodiment. 40 and 41 are arranged. As shown in FIG. 4, the mounting brackets 40, 40 disposed on the upper side wall 32 are connected to the brackets 4, 4 extending from the instrument panel reinforcement 2 on the body 1 side, and are mounted on the lower side wall 33. The brackets 41 and 41 are configured to be connected to brackets 5 and 6 extending from a center brace or front body pillar (not shown) on the body 1 side.

  As shown in FIGS. 2 and 3, the inflator 43 includes an inflator body 44 whose outer shape is substantially cylindrical, and a retainer 52 that holds the inflator body 44 and is attached to the bottom wall portion 28 of the case 27. Yes.

  As shown in FIG. 3, the inflator main body 44 is arranged so that the axial direction is substantially along the left-right direction, and protrudes from the large-diameter main body 45 and one end of the main body 45 in the left-right direction. And a small-diameter gas discharge portion 46. In the gas discharge portion 46, a large number of gas discharge ports 46a capable of discharging the expansion gas G are formed radially along the circumferential direction. In the case of the embodiment, the gas discharge part 46 is disposed on the left end side of the main body part 45. A connection port portion 48 for connecting a connector 49 to which an operation signal input lead wire 50 is connected is formed on the right end side which is the other end side in the left-right direction of the main body portion 45. In the inflator main body 44 of the embodiment, the connection port portion 48 has a smaller diameter than the right end side portion of the main body portion 45 and is formed so as to slightly protrude rightward from the right end surface 45 a of the main body portion 45. (See FIG. 3). In the embodiment, the inflator main body 44 is a hybrid type in which a pressurized gas and a gas generating agent are incorporated, and the main body portion 45 is located near the right end of the main body portion 45 of the inflator main body 44. As shown in FIG. 3, the sealing pin 47 that closes the sealing port when the pressurized gas is sealed in 45 is disposed so as to protrude from the outer peripheral surface 45 b.

  As shown in FIG. 8, the retainer 52 includes a substantially cylindrical holding portion 53 that covers the outer peripheral side of the inflator main body 44, and a bolt 59 as an attaching unit that is arranged so as to protrude from the holding portion 53. It is configured. The bolts 59 are provided so as to protrude substantially perpendicular to the axial direction of the holding portion 53 and are formed at two locations along the axial direction of the holding portion 53. As shown in FIGS. 2 and 3, the bolt 59 is disposed so as to protrude toward the front side of the vehicle when mounted on the vehicle.

  The holding portion 53 is made of a sheet metal and has a substantially cylindrical shape with the axial direction approximately along the left-right direction. In the holding part 53, the opening on the right end side constitutes an insertion opening 53d for inserting the inflator body 44 into the inside from the gas discharge part 46 side. In the holding portion 53, a contact portion 54 that contacts the outer peripheral surface 45 b of the main body portion 45 of the inflator main body 44 when the vehicle is mounted is formed in a portion disposed on the rear side of the inflator main body 44. As shown in FIG. 8, the abutment portion 54 is formed at two locations facing the bolt 59 in the front-rear direction. Specifically, as shown in FIG. 2, each contact portion 54 has two protrusions 55 arranged along the circumferential direction of the holding portion 53 so as to be substantially along the vertical direction in a cross section along the front-rear direction. , 55. Each protrusion 55 is formed to protrude toward the inflator main body 44 side so that the contact portion 54 is recessed toward the inflator main body 44 side. The outer shape is a substantially semicircular arc shape, and the tip surface 55a is The main body 45 of the inflator main body 44 is configured to contact the outer peripheral surface 45b. Further, in the holding portion 53, a support protrusion 29 formed on the bottom wall portion 28 of the case 27 at a position on the front side of the inflator main body 44 when mounted on the vehicle and between the bolts 59, 59. A through-hole 52a is formed for the insertion (see FIGS. 8 and 9). Further, on the right end side of the holding portion 53 and on the front side of the inflator main body 44 when mounted on the vehicle, as shown in FIG. 8, the holding portion 53 is cut out in a substantially rectangular shape from the right end, A notch recess 53b is formed. The notch recess 53b serves to position the inflator body 44 when the inflator body 44 is inserted from the gas discharge part 46 side. As shown in FIGS. By inserting an enclosing pin 47 that protrudes outward from the outer peripheral surface 45b and bringing it into contact with the left edge, the movement of the inflator main body 44 to the left is restricted, and gas discharge in the retainer 52 is performed. It is formed to determine the position of the portion 46.

  Further, in the holding portion 53, a portion between the contact portions 54, 54, and a portion where a later-described seal tube 72 of the airbag 63 is disposed, the seal tube 72 will be described later when the bag body 64 is inflated. The pressure contact opening 56 is formed so that the peripheral portion 45b of the inflator main body 44 is directly pressed against the outer peripheral surface 45b of the inflator main body 44 so that the periphery of the insertion opening 66 formed in the bag main body 64 can be sealed (FIG. 3). 8). Specifically, the pressure contact opening 56 is formed in a region on the left side of the contact portion 54R disposed on the right side. As shown in FIG. Except for the front side portion 53c arranged adjacent to each other, and is cut out over the entire circumferential direction. The pressure contact opening 56 has an opening width dimension such that when the bag body 64 is inflated, as shown in FIG. 17, the tip 74a of the body 74 in the seal tube 72 is disposed as a free end, and the inflator body 44 directly. The dimension is set such that it can be pressed against the outer peripheral surface 45b.

  Further, in the holding portion 53, which is a portion on the left side of the pressure contact opening 56 and on the rear portion of the inflator main body 44, as shown in FIG. 8, the tip is on the front side (inflator main body 44 side). A presser piece 57 formed so as to protrude while being inclined is disposed. The presser piece 57 is directly pressed against the outer peripheral surface 45b of the main body 45 without the seal tube 72 interposed therebetween as shown in FIG. 3 with the inflator main body 44 inserted into the holding portion 53. The inflator main body 44 is pressed to prevent the inflator main body 44 from rattling against the retainer 52. Furthermore, on the right end side of the holding portion 53, the retainer 52 is housed in the airbag 63 and the airbag 63 is folded so that the latch is disposed so as to protrude from the insertion opening 66 of the bag body 64. A claw portion 58 is formed. The locking claw portion 58 has a substantially L shape that protrudes rearward from the rear edge side when mounted on the vehicle and is bent so that the front end side is directed upward (see FIG. 2). In the airbag apparatus S of the embodiment, during the assembly work, the airbag 63 is folded while the retainer 52 is housed therein, and then the inflator body 44 is inserted into the airbag 63 from the insertion opening 66. The retaining claw portion 58 is inserted into the holding portion 53 of the retainer 52 housed in the airbag 63 at the peripheral portion of the insertion opening 66. It is provided to prevent the opening 53d from being blocked.

  In the airbag device S of the embodiment, when the inflator body 44 is stored in the holding portion 53 of the retainer 52 disposed in the airbag 63 and the airbag 63 is stored in the case 27, A configuration in which the inflator 43 and the airbag 63 are attached to the bottom wall portion 28 of the case 27 as an attachment site by causing the bolt 59 to protrude from the bottom wall portion 28 of the case 27 and fastening the nut 60 to the bolt 59. is there. Specifically, the inflator body 44 includes a support protrusion 29 formed on the bottom wall portion 28 of the case 27 and contact portions 54 and 54 formed on the holding portion 53 of the retainer 52 when the nut 60 is fastened. Thus, it is sandwiched and held by the retainer 52.

  In the embodiment, as shown in FIGS. 10 to 14, the airbag 63 includes a bag body 64, a seal tube 72 disposed in the bag body 64, and tethers 76 and 77 disposed in the bag body 64. , And is configured.

  The bag body 64 is configured so that the left and right knees K (KL, KR) of the driver D can be protected, as shown in the two-dot chain line in FIGS. ing. As shown in FIG. 10, the bag body 64 has substantially the same outer shape, and has a vehicle body side wall portion 64a disposed on the steering column 8 side when the inflation is completed, and a passenger side wall portion disposed on the driver D side when the inflation is completed. The peripheral edges of 64b are combined to form a bag. Further, as shown in FIG. 10, the bag body 64 includes an attachment portion 65 disposed in the case 27 when the inflation is completed, and a left and right knee K of the driver D when the inflation is completed. And a protective expansion part 70 for protecting (KL, KR).

  As shown in FIGS. 10 and 11, an insertion opening 66, two insertion holes 67 (67 </ b> L, 67 </ b> R), and a through hole 68 are formed in the region of the attachment portion 65 in the vehicle body side wall portion 64 a. Yes. The insertion opening 66 is for allowing the inflator 43 to be inserted into the bag body 64, and is disposed on the right end side of the mounting portion 65. In the embodiment, the opening 66 is opened so as to cut out the vehicle body side wall portion 64a. Is formed. Specifically, the insertion opening 66 is formed to open in a substantially rectangular shape in which the front and rear width dimensions are set slightly larger than the left and right width dimensions. More specifically, the insertion opening 66 is set such that the front and rear, left and right width dimensions L1, L2 (see FIG. 11) are both larger than the outer diameter dimension D1 (see FIG. 7) of the main body 45 in the inflator main body 44. In addition, the dimensions are set such that the retainer 52 can be inserted. The insertion holes 67 (67L, 67R) are for inserting the respective bolts 59 of the retainer 52, and are formed at two locations along the left-right direction in the region on the left side of the insertion opening 66. The through hole 68 is for inserting the support protrusion 29 formed on the bottom wall portion 28 of the case 27, and is formed at a position that is approximately the center between the insertion holes 67L and 67R. In the case of the embodiment, the insertion holes 67L and 67R and the through hole 68 are arranged from the left and right centers of the bag body 64 so that the left and right center lines of the bag body 64 pass between the through hole 68 and the left insertion hole 67L. It is formed at a position shifted to the right (see FIG. 10). In the embodiment, when the retainer 52 and the inflator body 44 are housed in the bag body 64 so that the bolt 59 protrudes from the insertion holes 67L and 67R, the inflator body 44 is shown in FIG. As shown, the right-hand portion is held by the retainer 52 so as to largely protrude from the insertion opening 66.

  In the case of the embodiment, as shown in FIGS. 10 and 12, the bag body 64 includes a single body base fabric 79 in which the vehicle body side wall portion 64 a and the passenger side wall portion 64 b are connected on the upper edge side. The left and right edge sides and the lower edge side are sewn together using a suture thread to form a bag shape. Reinforcement cloths 81 and 81 are overlapped on the inner peripheral side of the front region (the region of the attachment portion 65), respectively, so that two sheets are overlapped (see FIGS. 10 and 12 to 14). Furthermore, a further reinforcing cloth 82 for reinforcing the periphery of the insertion hole 67L is overlaid on a portion that becomes the periphery of the left insertion hole 67L in the vehicle body side wall 64a (see FIGS. 10 and 12). The reinforcing cloth 82 has a front edge side and a rear edge side sewn to the vehicle body side wall portion 64a. In addition, a belt-like reinforcing cloth 82 is also superimposed on a connecting portion (sewing portion) between the tether 77, the vehicle body side wall portion 64a, and the occupant side wall portion 64b (see FIGS. 10 and 12).

  The seal tube 72 has a substantially cylindrical shape extending from the periphery of the insertion opening 66 into the bag body 64 and is coupled to the periphery of the insertion opening 66 over the entire periphery. As shown in FIGS. 11, 14, and 16, the seal tube 72 includes a connecting portion 73 that is coupled to the periphery of the insertion opening 66 over the entire circumference, and a main body portion 74 that extends from the connecting portion 73 in a cylindrical shape. Yes. In the case of the embodiment, as shown in FIG. 15, the seal tube 72 includes two seal tube base fabrics 83 and 84 configured to divide the seal tube 72 into two parts on the right and left sides. . The base fabrics 83 and 84 for the seal tubes constitute the main body portion 74 by setting the width of the front and rear direction side portions 83a and 84a constituting the connecting portion 73 to be smaller than that of the base portion side portions 83a and 84a. Tip side portions 83b and 84b.

  The main body 74 is formed into a cylindrical shape by overlapping the front end portions 83b and 84b of the respective seal tube base fabrics 83 and 84 and sewing the front and rear edges using sutures. The main body 74 has an inner diameter that allows the retainer 52 in the inflator 43 to be easily inserted, and the inflation gas G that has flowed into the bag main body 64 during operation of the inflator 43 causes the inflator main body 44 to extend over the entire circumference. The dimension is set so that it can be pressed against the outer peripheral surface 45b of the outer peripheral surface 45b without any problem. Specifically, the main body 74 has a separation distance L3 (see FIG. 11) between the stitched portions 86 and 86 in a flatly deployed state, and a width dimension L1 of 1.8 in the front-rear direction side of the insertion opening 66. It is set to about twice. The main body 74 has the length L4 (see FIG. 11) with the front end 74a facing leftward in the bag main body 64 in a state where the vehicle body side wall 64a and the occupant side wall 64b are flattened so as to overlap each other. In such a folded state, the dimensions are set such that the tip 74a is placed close to the right side of the through hole 68. The main body 74 is configured so that the tip 74a is positioned in the region of the pressure contact opening 56 in the retainer 52 and in the vicinity of the left edge 56a of the pressure contact opening 56 when mounted on the vehicle. (See FIG. 3). That is, the main body 74 can cover the pressure contact opening 56 over substantially the entire area except for the left edge 56a side when the vehicle is mounted, and the pressure contact opening 56 with the tip 74a as a free end. The tip 74a of the main body portion 74 is pushed into the press-contact opening 56 when the inflator 43 is operated, and the press-contact opening 56 in the main body portion 74 is moved. It will be press-contacted with the outer peripheral surface 45b of the inflator main body 44 over the wide area | region which covers the right and left (refer FIG. 17). Further, in the main body 74, when the inflator 43 is inserted, there is an inflator 43 on the base side of the region of the left side portion (tip side portion 84b) disposed between the inflator 43 and the vehicle body side wall portion 64a. An insertion hole 74b through which the bolt 59 can be inserted is formed (see FIGS. 14 to 16). That is, in the embodiment, the seal tube 72 is fastened together with the bag main body 64 and the inflator 43 to the bottom wall portion 28 of the case 27, using the bolt 59 of the retainer 52 at the base portion side portion of the main body portion 74. This is a configuration.

  In the embodiment, the connecting portion 73 is opened so that the base portion side portions 83a and 84a of the seal tube base fabrics 83 and 84 extending from the cylindrical main body portion 74 are separated from each other. In this state, the peripheral edge is sewn to the peripheral edge of the insertion opening 66 in the vehicle body side wall portion 64a using the suture thread. Specifically, the connecting portion 73 is used for inserting the ends of the base portions of the two stitching portions 86 and 86 that are sewn together at the edges of the tip side portions 83b and 84b constituting the main body portion 74. The part which becomes the vicinity of the outer peripheral edge of the base part side parts 83a and 84a in a state where the base part side parts 83a and 84a are opened so as to be spaced apart from each other so as to be arranged on a line passing through the substantially center of the left and right of the opening 66 Are sewn to the vehicle body side wall portion 64a (see FIG. 15), and a stitching portion 87 for sewing the connection portion 73 to the vehicle body side wall portion 64a is substantially rectangular and is formed outside the connection portion 73. It is configured so as to be located in the vicinity of the periphery and outside the front and rear sides of the sutured portions 86 and 86 constituting the main body 74. The connecting portion 73 is configured to extend the left side region of the insertion opening 66 to the left, and the bag body 64 is formed in the left region of the insertion opening 66 in the connecting portion 73. An insertion hole 73a through which the right bolt 59 of the retainer 52 can be inserted is formed at a position corresponding to the right insertion hole 67R (see FIGS. 15 and 16). In the case of the embodiment, the connecting portion 73 of the seal tube 72 also serves as a reinforcing cloth that reinforces the periphery of the insertion hole 67R. In the embodiment, the stitching portion 87 for sewing the connecting portion 73 to the vehicle body side wall portion 64a is obtained by sewing the peripheral edges of the main body base fabric 79 constituting the bag main body 64 as shown in FIG. The front edge side portion is shared with the stitching portion where the peripheral edges of the main body base fabric 79 constituting the bag main body 64 are sewn together.

  As shown in FIGS. 10 and 12, two tethers 76 and 77 are arranged inside the bag body 64 so as to be separated from each other in the front-rear direction, and are arranged substantially along the left-right direction. . The tether 76 is disposed so as to partition the attachment portion 65 and the protective expansion portion 70, and the tether 77 is disposed so as to partition the region of the protective expansion portion 70 in the front-rear direction (up and down). In the front tether 76, as shown in FIG. 10, two gas flow holes 76a and 76a through which the expansion gas can flow are formed at symmetrical positions. As shown in FIG. 10, the rear tether 77 is formed with one gas flow hole 77a through which the expansion gas can flow in the left and right centers.

  In the embodiment, the main body base fabric 79, the reinforcing fabrics 80, 81, and 82, the seal tube base fabrics 83 and 84, and the tethers 76 and 77 constituting the bag main body 64 are woven fabrics such as polyester yarn and polyamide yarn. It is formed from a coated cloth in which a coating agent for gas leakage is applied.

  Next, mounting of the airbag device S of the embodiment on a vehicle will be described. First, the retainer 52 is housed in the airbag 63 while being inserted into the main body 74 of the seal tube 72 from the insertion opening 66 so that the bolt 59 protrudes from the insertion hole 67. At this time, the bolt 59 on the right side of the retainer 52 protrudes from the insertion hole 67R (insertion hole 73a) through the insertion hole 74b formed in the main body 74 of the seal tube 72, and the right portion of the retainer 52 Is inserted into the main body 74 of the seal tube 72. The airbag 63 is folded so as to be housed in the case 27 in a state where the locking claw portion 58 formed in the holding portion 53 protrudes from the insertion opening 66, and breakage for preventing collapse. The surroundings are wrapped with a wrapping material (not shown). At this time, the insertion opening 66 is exposed from the wrapping material including the peripheral portion.

  Next, the inflator main body 44 is inserted into the airbag 63 (inside the holding portion 53 of the retainer 52) from the gas discharge portion 46 side through the insertion opening 66. At this time, the sealing pin 47 protruding from the outer peripheral surface 45b of the main body 45 in the inflator main body 44 is inserted into the notch recess 53b formed in the holding portion 53, and the inflator main body 44 is held until it contacts the edge. It is inserted into the part 53. Thereafter, the folded airbag 63 and the inflator 43 are accommodated in the case 27 so that the bolt 59 protrudes from the bottom wall portion 28, and the nut 60 is fastened to the bolt 59 protruding from the bottom wall portion 28. Then, the airbag 63 and the inflator 43 are attached to the case 27. When the nut 60 is fastened, the inflator main body 44 is sandwiched between the support protrusion 29 formed on the bottom wall portion 28 and the contact portions 54 and 54 formed on the holding portion 53 of the retainer 52. In addition, a part of the base portion 74 of the main body 74 in the seal tube 72 is fastened together with the airbag 63 and the inflator 43 to the bottom wall portion 28.

  Thereafter, the airbag assembly can be assembled by assembling the airbag cover 17 to the case 27 so that the locking claws 32a, 33a are locked to the peripheral edges of the locking holes 22a, 23a. Then, the airbag assembly is attached and fixed to the body 1 side using the brackets 4, 5, and 6, and the air port assembly 48 exposed from the insertion hole 36 of the case 27 is connected to the connection port 48 of the inflator body 44. A connector 49 to which a lead wire 50 extending from the bag operating circuit is connected is connected. Thereafter, if the instrument panel 13 and the under cover 14 (see FIGS. 1 and 2) are attached, the airbag device S can be mounted on the vehicle.

  After the air bag device S is mounted on the vehicle, if an operation signal is input to the inflator main body 44 via the lead wire 50, the inflation gas is discharged from the gas discharge port 46a of the inflator main body 44, and the bag main body 64 Will flow into. The bag body 64 is inflated by flowing an inflating gas into the interior, breaking a wrapping material (not shown), pressing the door portion 19 of the airbag cover 17, and the door portion 19 While breaking 20, the hinge 21 is opened up and down around the center of rotation. And the bag main body 64 will protrude toward the vehicle rear side from the opening 27a for protrusion of the case 27, and as shown in the dashed-two dotted line of FIG.

  In the airbag apparatus S of the embodiment, the airbag 63 has a configuration in which a seal tube 72 extending into the bag main body 64 is disposed around the insertion opening 66 formed in the bag main body 64, and the inflator in the inflator 43. The main body 44 is inserted into the seal tube 72 from the gas discharge portion 46 side on the left end side through the insertion opening 66, and the connection port portion 48 side on the right end side protrudes from the insertion opening 66. However, it is the structure inserted in the airbag 63. FIG. That is, in the airbag apparatus S of the embodiment, the seal tube 72 is accommodated in the airbag 63 and covers the outer peripheral side of the inflator 43 attached to the bottom wall portion 28 of the case 27 as an attachment site. Since the bag body 64 is separated from the bag body 64 as a state fixed to the bag body 64, the seal tube 72 is affected by the expanding bag body 64 when the bag body 64 is expanded and inflated. 43, the entire seal tube 72 is subjected to the internal pressure of the inflation gas G discharged from the inflator 43 over the entire circumference, and the outer peripheral surface side of the inflator 43 (retained in the retainer 52). The outer peripheral surface side of the portion 53 and the outer peripheral surface 45b side of the inflator main body 44). That (see FIGS. 17 and 18). Therefore, the outer peripheral surface of the inflator 43, in particular, the outer peripheral surface 45b of the inflator main body 44 can be covered without a gap by the main body portion 74 of the seal tube 72, and gas leakage from between the insertion opening 66 and the inflator 43 is minimized. Can be prevented. Further, in the airbag device S of the embodiment, since the main body 74 of the seal tube 72 is pressed against the outer peripheral surface of the inflator 43 using the pressing force by the inflation gas G, the predetermined length is set. If the entire main body 74 of the secured seal tube 72 can be pressed against the outer peripheral surface side of the inflator 43 (the outer peripheral surface 45b side of the inflator main body 44), the inner diameter dimension of the seal tube 72 (main body portion 74) is set to the outside of the inflator 43. Even if it is set larger than the diameter dimension (the outer dimension of the holding portion 53 in the retainer 52), gas leakage can be prevented without any trouble. Therefore, by setting the inner diameter dimension of the seal tube 72 (main body portion 74) to be larger than the outer diameter dimension of the inflator 43, the operation of inserting the inflator 43 into the airbag 63 can be facilitated.

  Therefore, in the airbag apparatus S of the embodiment, the workability of inserting the inflator 43 into the insertion opening 66 is good, and the sealing performance of the insertion opening 66 is also good.

  Further, in the airbag device S of the embodiment, the base portion side portion, which is a part of the main body portion 74 in the seal tube 72, is attached to the bag main body 64 and the bolt 59 of the retainer 52 protruding from the bag main body 64. Since the main body 74 of the seal tube 72 is located between the bag main body 64 and the inflator 43 because the main body 74 of the seal tube 72 is fastened together with the bottom wall 28 of the case 27 as an attachment site together with the inflator 43. The main body 74 of the seal tube 72 is swollen by the inflation gas flowing in the bag main body 64 when the bag main body 64 is deployed and inflated. And the outer peripheral side of the inflator 43 can be reliably covered by the entire main body 74 of the seal tube 72. Of course, if such a point is not taken into consideration, the seal tube may be connected only to the peripheral edge of the insertion opening and not tightened together using the bolt of the retainer.

  Furthermore, in the airbag apparatus S of the embodiment, the inflator 43 includes the inflator main body 44 and the retainer 52 that holds the inflator main body 44 and is attached to the bottom wall portion 28. If the inflator body 44 is inserted into the holding portion 53 of the retainer 52 through the insertion opening 66 in the airbag 63 folded in the state of being housed in the retainer 52, the inflator 43 is retained. Can be stored inside the airbag 63. Therefore, since the folding operation of the airbag 63 and the storing operation of the inflator body 44 in the airbag 63 can be easily performed in different places, the retainer 52 is stored in advance and folded. The air bag 63 can be transported to another place, and only the storing operation of the inflator main body 44 requiring attention in handling can be performed in another place. Further, in the airbag apparatus S of the embodiment, the inflator 43 includes the inflator main body 44 and the retainer 52, and the inflator main body 44 is held in the holding portion 53 of the retainer 52 in the bag main body 64. However, when the bag body 64 is inflated, the body portion 74 of the seal tube 72 is pushed into the pressure contact opening 56 formed in the holding portion 53 under the pressure of the inflation gas G. Thus, it comes into direct pressure contact with the outer peripheral surface 45b of the inflator body 44. Therefore, even if the inflator 43 includes the inflator main body 44, the retainer, and the 52, gas leakage from between the inflator main body 44 and the insertion opening 66 can be prevented accurately. Of course, if such a point is not taken into consideration, a structure in which a separate retainer is not provided as an inflator and a bolt as a mounting means protrudes from the inflator itself may be used.

  In particular, in the airbag apparatus S of the embodiment, the insertion opening 66 is notched across the entire circumferential direction in the holding portion 53 except for the front side portion 53c disposed adjacent to the bottom wall portion 28 of the case 27. As shown in FIG. 18, the main body portion 74 of the seal tube 72 is formed directly on the outer peripheral side of the main body portion 45 in the inflator main body 44 over substantially the entire area excluding the front side region. In addition, since it is disposed so as to partially enter the gap between the front side portion 53c and the main body portion 45, the gap from the gap between the inflator main body 44 and the holding portion 53 of the retainer 52 can be reduced. Gas leakage can be prevented as much as possible. Further, in the airbag device S of the embodiment, the main body 74 of the seal tube 72 is not configured to cover the entire pressure contact opening 56, and the tip 74 a is disposed in the region of the pressure contact opening 56. Therefore, when the bag main body 64 is inflated, the front end 74a becomes a free end, receives the pressing force of the inflation gas G, and is pushed into the pressure contact opening 56 so that the outer peripheral surface 45b of the inflator main body 44 is. (See FIG. 17). Therefore, the tip 74a of the main body 74 in the seal tube 72 is strongly pressed against the outer peripheral surface 45b of the inflator main body 44, and gas leakage from the insertion opening 66 can be prevented as much as possible. If this point is not taken into consideration, the seal tube may be set to a size that covers the entire pressure contact opening.

  In the embodiment, the knee protection airbag device S has been described as an example. However, the airbag device to which the present invention can be applied is not limited to this, for example, the left and right sides of the occupant seated in the seat You may apply this invention to the airbag apparatus for side collision arrange | positioned in the direction.

  DESCRIPTION OF SYMBOLS 17 ... Airbag cover, 27 ... Case, 28 ... Bottom wall part (attachment part), 43 ... Inflator, 44 ... Inflator main body, 45 ... Main body part, 45b ... Outer peripheral surface, 46 ... Gas discharge part, 48 ... Connection port part , 52 ... Retainer, 53 ... Holding part, 56 ... Pressure contact opening, 59 ... Bolt (attachment means), 63 ... Air bag, 64 ... Bag body, 66 ... Insertion opening, 67 (67L, 67R) ... Insertion hole , 72 ... seal tube, 73 ... connecting part, 74 ... main body part, 74b ... insertion hole, D ... driver, K (KL, KR) ... knee, G ... inflation gas, S ... airbag device for knee protection.

Claims (3)

As a bag made of a flexible base material, an airbag that is folded and stored;
The outer shape is substantially columnar, and a gas discharge port capable of discharging an inflation gas is provided on one end side, and the other end side protrudes out of the airbag from the gas discharge port side. An inflator attached to the attachment site together with the airbag, using an attachment means protruding from the airbag in a state of being inserted into the airbag through an insertion opening formed in the bag;
In an airbag device configured to include:
The airbag has an opening for cutting out the base material, and a bag body having the insertion opening formed so that the inflator can be inserted;
A substantially cylindrical seal tube formed of a flexible base material and formed to extend from the periphery of the insertion opening into the bag body;
Is configured to include,
The inner diameter of the seal tube is set such that the inflator can be inserted, and when the inflator is in operation, the seal tube is pressed against the outer peripheral surface of the inflator over the entire circumference by the inflation gas flowing into the airbag. The airbag device is configured so that the peripheral edge of the insertion opening can be sealed.   The seal tube is partly fastened together with the bag body and the inflator together with the attachment site by using the attachment means of the inflator protruding from the bag body. The airbag apparatus according to 1. The inflator is configured to include an inflator body provided with the gas discharge port capable of discharging the inflation gas, and a retainer that holds the inflator body and is attached to the attachment site.
The retainer includes a substantially cylindrical holding part into which the inflator main body can be inserted from the gas discharge port side, and the attachment means arranged to protrude from the holding part,
The holding portion is formed with a pressure contact opening that allows the seal tube to be pressed against the outer peripheral surface of the inflator main body when the bag main body is inflated to seal the periphery of the opening for insertion. The airbag apparatus according to claim 1 or 2.

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