JP6150220B2 - Assembly method of airbag assembly - Google Patents

Description

  The present invention relates to a method for assembling an airbag assembly when forming an airbag assembly in which a folded airbag is housed and fixed in a case.

  2. Description of the Related Art Conventionally, in an airbag device, for example, a knee protection airbag device, a retainer for attaching an inflator or an airbag to a case is disposed in a folded airbag, and the retainer includes a main body disposed in the airbag. And a plurality of assembly bolts projecting outside the airbag (see, for example, Patent Document 1).

  The airbag assembly in which the folded airbag is housed in the case has the retainer body disposed in the airbag so that the assembly bolt protrudes outside the airbag, and then the airbag is installed. The bag is folded, and then the folded airbag is stored in the case from the opening side of the airbag when the case is inflated so that the assembly bolt protrudes from the bottom wall of the case. A nut is fastened to each assembly bolt projecting from the bottom wall, and the folded airbag is housed and fixed in the case, and the airbag assembly is assembled.

  In the method of assembling the airbag device, when the inflator that supplies the inflation gas to the airbag is stored in the case, an assembly hole is provided on the end surface of the bolt that protrudes from one end in the axial direction of the inflator. The guide pin is fitted into the assembly hole through the through hole of the case set above, and the case is fitted to the outer peripheral side of the inflator while sliding the through hole on the guide pin. There has also been an assembly method in which the airbag device is assembled by protruding the bolt (see, for example, Patent Document 2).

JP 2006-321331 A JP-A-6-8787

  However, if there are a plurality of assembly bolts extending from the conventional retainer, when all of them are passed through the through holes of the case, the positions of the through holes in the case and the positions of the assembly bolts in the retainer vary. Since this is likely to cause interference, it is difficult to automate and is manually assembled.

  As in Patent Document 2, an assembly hole is provided on the end surface of the bolt, and a guide pin that fits into the assembly hole is used to guide the insertion direction of the bolt so that one bolt of the inflator is removed from the case. The protruding assembly method is not a method for storing and fixing the airbag in the case, so that the airbag can be stored and fixed in the case using a retainer having a plurality of mounting bolts that can be easily automated. It was not possible to use it in the attachment method.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and allows a plurality of assembly bolts for storing and fixing a folded airbag to the case to be easily passed through the case, and to be easily automated. An object is to provide a method for assembling a bag assembly.

In the method for assembling the airbag assembly according to the present invention, the airbag assembly includes a folded airbag, a case for storing the folded airbag, and a folded airbag. And a retainer having a plurality of assembly bolts that are installed and project outside the airbag,
The assembly preparation body on the side of the airbag folded in a state in which the retainer is disposed while projecting each of the assembly bolts out of the case from the projecting opening side of the airbag in the case. An airbag assembly that is housed on the bottom wall portion side provided with a through-hole of an assembly bolt, and a nut is fastened to each assembly bolt that protrudes outside the case, and the airbag is fixed to the case and assembled. In the attachment method of the appendix,
A case holder for holding the case by positioning the bottom wall portion of the case on the lower side and positioning the protruding opening side on the upper side;
A plurality of holding guide pins that extend upward through a through-hole in the bottom wall portion from the lower side of the case holder, and move up and down integrally;
Use an assembly jig equipped with
A fitting portion that is fitted to each other is disposed at the upper end of each holding guide pin and the tip of the assembly bolt that corresponds to the holding guide pin.
The fitting portion on the assembly bolt side is configured as a fitting convex portion that protrudes along the axis of the assembly bolt from a male screw portion that is screwed into the nut of the assembly bolt,
The fitting portion on the holding guide pin side is configured as a fitting concave portion disposed on the front end surface of the holding guide pin so that the fitting convex portion can be fitted,
The fitting convex portion and the fitting concave portion are configured as a fitting shape that can be placed on the holding guide pin by allowing the assembly preparation body before being stored in the case to be self-supported when being fitted to each other. And
During assembly,
The case holder of the assembly jig holds the case, and the holding guide pins protrude upward through the through holes of the case,
The fitting convex part and the fitting concave part are fitted to each other, and the assembly preparation body is arranged on the holding guide pin,
The assembly guide body is pushed into the case while the holding guide pin is lowered so as to be pulled out from the through-hole, and the assembly bolts are assembled by projecting from the bottom wall portion of the case. And

  In the method of assembling the airbag assembly according to the present invention, the fitting convex part at the tip of the assembly bolt and the fitting concave part at the upper end of the holding guide pin are fitted together before being stored in the case. Since the assembly preparation body is configured as a fitting shape that can be placed on the holding guide pin by itself without falling down without using a support member or the like, the assembly preparation body is first assembled. Make the case holder of the attachment jig hold the case with the protruding opening side on the top and the bottom wall side on the bottom, and make each holding guide pin protrude upward through each through-hole in the case Keep it. Thereafter, the fitting convex portion is fitted (inserted) into the fitting concave portion, and the assembly preparation body is held by the holding guide pin. At this time, the airbag itself is not held in contact with the holding guide pin or the case, but simply holds the assembly preparation body, and the fitting projection at the tip of the assembly bolt is fitted into the fitting recess of the holding guide pin. Therefore, the fitting convex portion and the fitting concave portion can be easily fitted to each other. Further, at the end of this fitting, the assembly preparation body can stand on its own without falling down, and the posture held by the holding guide pins can be stably maintained. Thereafter, the assembly preparation body is simply assembled. If the bolt and the holding guide pin are axially moved closer to the case side, that is, if the assembly preparation body is simply pushed down or the case side is pushed up, each assembly bolt is moved to the bottom wall. The assembly preparation body can be accommodated in the case while projecting from the through hole of the part. In other words, a member that separately supports the assembly preparation body is provided around the fitting recess so that the assembly preparation body is placed on the holding guide pin so that the assembly protrusion is not fitted over the fitting recess. After that, simply push down the assembly preparation body or push up the case side along the axial direction of the assembly bolt or holding guide pin, and then linearly prepare the assembly preparation body or case. By simply moving the side, the airbag can be smoothly accommodated in the case and the assembly bolt can be protruded from the through hole.

  Therefore, it is easy to fit the assembly bolt to the holding guide pin, and the movement after the fitting can be done by a linear pressing operation. It can be accommodated and the assembly bolt can be passed through the case.

  After the assembly preparation body is stored in the case, the airbag can be stably stored and fixed in the case by fastening a nut to each assembly bolt protruding from the case.

  Therefore, in the method of assembling the airbag assembly according to the present invention, a plurality of assembly bolts for storing and fixing the folded airbag in the case can be easily passed through the case, and automation is also possible. Can be easily.

And in the assembly method of the airbag assembly according to the present invention, the fitting convex portion is a conical tapered portion in which the axial center of the fitting bolt provided with the fitting convex portion is aligned. Provided, the fitting recess is configured with a tapered hole portion corresponding to the tapered shape portion,
It is desirable that the tapered shape portion and the tapered hole portion are configured as a fitting shape in which the assembly preparation body before being stored in the case can be placed independently when being fitted to each other.

  In such a configuration, if the tapered portion of the assembly bolt is inserted into the tapered hole portion of each holding guide pin, the taper surface slides between the inner peripheral surface of the tapered hole portion and the outer peripheral surface of the tapered portion. Therefore, even if there is a slight misalignment between the holding guide pin and the assembly bolt, it can be easily corrected and fitted while aligning. Becomes easy.

  Furthermore, in the above configuration, the taper surfaces of the inner peripheral surface of the tapered hole portion and the outer peripheral surface of the tapered portion are fitted to each other, and the self-supporting posture of the assembly preparation body is stably secured without rattling. it can.

Further, in the method of assembling the airbag assembly according to the present invention, the fitting convex portion has a smaller diameter than the male screw portion by aligning the shaft with the assembly bolt provided with the fitting convex portion. Provided with a columnar columnar portion, and the fitting recess includes a fitting hole corresponding to the columnar portion,
The columnar shape portion and the fitting hole may be configured as a shape that allows the assembly preparation body before being housed in the case to be self-supporting and disposed at the time of mutual fitting.

  Even in such a configuration, the columnar shape portion and the fitting hole can ensure a stable independence of the assembly preparation body at the time of mutual fitting. Further, a step is provided at the front end of the assembly bolt to provide a columnar shape portion, and a corresponding fitting hole is provided at the front end surface of the holding guide pin, and it is not necessary to provide an inclined tapered surface. These columnar portions and fitting holes can be formed by easy processing.

It is a schematic longitudinal cross-sectional view which shows the vehicle mounting state of the airbag apparatus which has arrange | positioned the airbag assembly | attachment body of 1st Embodiment which concerns on this invention. It is a general | schematic expanded longitudinal cross-sectional view of the airbag apparatus of 1st Embodiment. It is a general | schematic expanded cross-sectional view of the airbag apparatus of 1st Embodiment. It is an expanded partial sectional view of the assembly bolt and holding guide pin of a 1st embodiment. It is the figure seen from the side of the left-right direction of the case explaining the assembly | attachment time of 1st Embodiment. It is the figure seen from the lower wall part side of the case which shows the state before pushing down of the assembly preparation body at the time of the assembly | attachment of 1st Embodiment. It is the figure seen from the lower wall part side of the case which shows the state of the push-down completion of the assembly preparation body at the time of the assembly | attachment of 1st Embodiment. It is a general | schematic expanded longitudinal cross-sectional view of the airbag apparatus which arrange | positioned the airbag assembly | attachment body of 2nd Embodiment. It is an expanded partial sectional view of the assembly bolt and holding guide pin of a 2nd embodiment. It is the figure seen from the side of the left-right direction of the case explaining the assembly | attachment time of 2nd Embodiment. It is the figure seen from the lower wall part side of the case which shows the state before pushing down of the assembly preparation body at the time of the assembly | attachment of 2nd Embodiment. It is the figure seen from the lower wall part side of the case which shows the state of the push-down completion of the assembly preparation body at the time of the assembly | attachment of 2nd Embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An airbag assembly AB1 according to a first embodiment is mounted on a vehicle as an airbag device S1 for knee protection. As shown in FIG. 1, the device S <b> 1 is disposed below the steering column 4 provided with the steering wheel 5 on the front side of the vehicle of the driver D so as to protect the knee K of the driver D as an occupant. ing.

  As shown in FIGS. 2 and 3, the airbag device S <b> 1 stores the folded airbag 60, the inflator 40 that supplies inflation gas to the airbag 60, and the folded airbag 60 and the inflator 40. In addition, the case 20 having the vehicle rear side opened, the retainer 45 for fixing the airbag 60 and the inflator 40 to the case 20, the airbag cover 10 covering the vehicle rear side of the airbag 60 housed in the case 20, It is configured with.

  The airbag assembly AB1 includes the case 20, the inflator 40, the retainer 45, and the airbag 60. Further, the inflator 40, the retainer 45, and the airbag 60 that are housed and fixed in the case 20 are configured as an assembly preparation body P1 that is integrally assembled before being assembled to the case 20.

  The airbag cover 10 is formed of a polyolefin-based thermoplastic elastomer, and as shown in FIGS. 1 to 3, an instrument panel (hereinafter abbreviated as “instrument panel”) 7 so as to cover the vehicle rear side of the case 20. It is arrange | positioned at the lower part side. In the case of the embodiment, the airbag cover 10 includes a door disposition portion 11 disposed in the vicinity of the protrusion opening 21 of the case 20, and a rectangular tubular peripheral wall portion 14 extending forward from the vicinity of the periphery of the door disposition portion 11. And a peripheral edge portion 13 disposed on the front surface side of the instrument panel 7 while being shifted forward from the left and right of the door arrangement portion 11.

  The door arrangement portion 11 includes two door portions 11 a that cover the protruding opening 21 of the case 20 and can be opened up and down. The door portions 11a and 11a are provided with a thin planned break portion 11c that is substantially H-shaped when viewed from the vehicle rear side. The door portions 11a, 11a are pushed by the inflating airbag 60 to break the planned breaking portion 11c, and are disposed so as to open on both the upper and lower sides with the thin hinge portions 11b on the upper and lower ends as rotation centers. ing.

  As shown in FIGS. 2 and 3, the peripheral wall portion 14 is disposed so as to extend in a square tube shape from the peripheral edge of the door portion 11 a toward the front, and is opposed to the mounting wall portions 15 and 16 that are opposed vertically. And side wall portions 18, 18. The upper and lower mounting wall portions 15 and 16 are formed with locking holes 17 for locking the plurality of locking claws 28 of the case 20.

  As shown in FIGS. 2 and 3, the case 20 is made of sheet metal, and is disposed on the front side of the vehicle and extends in the left-right direction. The case 20 extends rearward from the periphery of the bottom wall 23. The peripheral wall portion 25 has a substantially square cylindrical shape, and has a substantially box shape having a protruding opening 21 that can project the airbag 60 on the rear end side of the peripheral wall portion 25. The peripheral wall portion 25 includes an upper wall portion 26 and a lower wall portion 27 that face each other in the vertical direction, and side wall portions 30 and 31 that face each other on the left and right.

  In the bottom wall portion 23, through holes 23a through which an assembly bolt 50 (to be described later) of the retainer 45 is passed are arranged at two locations separated left and right so as to penetrate in the front-rear direction. Further, between the two through holes 23a, a support protrusion 23b that supports the inflator 40 by being hemispherically raised on the protruding opening 21 side is disposed.

  On the upper wall portion 26 and the lower wall portion 27 of the peripheral wall portion 25, a plurality of locking claws 28 that are formed to protrude outward on the rear edge side and further to be reversed to the front side, It is arranged. As described above, these locking claws 28 are inserted into the locking holes 17 of the airbag cover 10 to lock the mounting wall portions 15 and 16 and are pushed by the airbag 60 that is inflated. When the scheduled break portion 11c breaks, the forward movement of the airbag cover 16 other than the door portions 11a and 11a is disposed so as to be restricted.

  Further, left and right side wall portions 30 and 31 of the peripheral wall portion 25 are provided with attachment piece portions 32 for attaching the airbag device S1 to the vehicle body side. Each mounting piece 32 is bolted to the bracket 2 extending from an instrument panel hose (not shown) to mount the airbag device S1 on the vehicle.

  Further, the side wall portion 30 is provided with an insertion hole 33 for connecting a connector, not shown, for connecting a lead wire (not shown) for inputting an operation signal to the assembled inflator 40 to the connection portion 41 a of the inflator 40.

  The case 20 includes a sheet metal member that forms the bottom wall portion 23, the upper wall portion 26 and the lower wall portion 27 of the peripheral wall portion 25, and two sheets that respectively constitute the left and right side wall portions 30 and 31. The sheet metal member is welded to each other.

  As shown in FIGS. 2 and 3, the inflator 40 includes a large-diameter portion 41 whose outer shape is a substantially cylindrical shape, and a small-diameter portion 42 that is a substantially cylindrical shape having a smaller diameter than the large-diameter portion 41 protruding from the large-diameter portion 41. The small-diameter portion 42 is provided with a plurality of gas discharge ports 42a for discharging expansion gas. As described above, the connection portion 41a for connecting the connector to which the operation lead wire is connected is disposed at the end portion of the large diameter portion 41 away from the small diameter portion.

  The retainer 45 includes a substantially cylindrical main body 46 and a plurality of (two in the embodiment) assembly bolts 50. The main body portion 46 includes various openings 46a on the peripheral surface on the opposite side of the assembly bolt 50, and opens insertion holes 46c through which the support protrusions 23b of the case 20 are inserted on the peripheral surface on the assembly bolt 50 side. I am letting. In addition, the main body portion 46 is provided with two pressing portions 46b and 46b that protrude so as to be curved inwardly at portions opposite to the arrangement positions of the assembly bolts 50, respectively. ing. These pressing portions 46 b press the outer peripheral surface of the large-diameter portion 41 of the inflator 40 and abut against the large-diameter portion 41 when the nut 90 is fastened to the assembly bolt 50 protruding from the bottom wall portion 23 of the case 20. Together with the support protrusion 23 b of the case 20, the inflator 40 is attached and fixed to the case 20.

  As shown in FIG. 4, the assembly bolt 50 is made of metal (steel) and is fixed to the inner peripheral side of the main body 46, and the fixed head 51 is protruded from the main body 46. A male threaded portion 52 that extends from and engages with a nut 90 (see FIGS. 2 and 3), and a fitting convex portion (fitting portion) 53 disposed on the distal end side of the male threaded portion 52. . In the case of the embodiment, the fitting convex portion 53 is configured by a conical tapered portion 54 extending from the male screw portion 52 with the assembly bolt 50 and the shaft center C <b> 1 aligned.

  In the case of the embodiment, the taper angle θ1 of the tapered portion 54 is 16 °, the length dimension L1 is 4.5 mm, and the outer diameter dimension d1 of the distal end surface 56 is 2.9φ.

  The airbag 60 is formed from a woven fabric made of flexible polyester, polyamide yarn, or the like, and has a substantially rectangular plate shape when inflated, as shown by a two-dot chain line in FIG. The left and right knees K of D can be protected. The airbag 60 includes a mounting hole 61 (see FIG. 4) that allows the male screw portions 52 of the assembly bolts 50 and 50 to pass through. The peripheral edge of the mounting hole 61 serves as a mounting portion 62, and the retainer 45 causes the bottom wall portion of the case 20 to be attached. It is set as the part attached to 23. Further, an insertion hole 63 (see FIG. 3) for accommodating the retainer 45 in the airbag 60 is disposed in the vicinity of the attachment portion 62.

  As shown in FIGS. 5 to 7, an assembly jig 70 used when assembling the assembly preparation body P <b> 1 including the inflator 40, the retainer 45, and the airbag 60 to the case 20 includes a case holder 71 and 2. And two holding guide pins 81 corresponding to the assembling bolts 50 of the book.

  The case holder 71 is made of metal (made of steel) and is held by a support base (not shown) on the lower surface side so that the upper surface side can hold the bottom wall portion 23 of the case 20. Near both ends, a holding recess 71a corresponding to the outer peripheral shape on the bottom wall 23 side is provided. When the case holder 71 is placed in the holding recess 71a so as to fit the bottom wall portion 23 side of the case 20, the bottom wall portion 23 is positioned on the lower side and the protruding opening 21 side is positioned on the upper side. As described in detail, the case 20 can be held by being arranged so that the axial center of the through hole 23a of the bottom wall portion 23 is along the vertical direction. Further, the case holder 71 includes an insertion opening 71b that can move the holding guide pins 81, 81 up and down.

  The holding guide pin 81 is made of metal (steel) and extends upward from a holding base 80 connected to a predetermined reciprocating drive device such as an air cylinder. The holding base 80 is disposed below the case holder 71, and each holding guide pin 81 is inserted from the lower side of the case holder 71 through the through hole 23 a of the bottom wall portion 23 through the insertion opening 71 b. And it is arrange | positioned so that it may extend upwards.

  A fitting recess 83 as a fitting portion is formed on the tip surface (tip portion) at the upper end of each holding guide pin 81 so that the fitting projection 53 at the tip of the assembly bolt 50 can be fitted. (See FIG. 4). When the fitting concave portion 53 of the assembly bolt 50 is fitted, the fitting concave portion 83 is separately provided on the side of the folded airbag 60 before being stored in the case 20, that is, the assembly preparation body P1. It is formed in the concave shape corresponding to the fitting convex part 53 so that it can stand and arrange | position without falling down, without utilizing a support member. In the embodiment, the fitting convex portion 53 is configured by a tapered shape portion 54, and the fitting concave portion 83 is configured by a tapered hole portion 84 having a tapered surface 85 that narrows downward corresponding to the tapered shape portion 54. Has been. A round hole-shaped recess 86 is formed at the bottom of the taper hole 84.

  The holding guide pin 81 inserted through the through hole 23a has an outer diameter smaller than the inner diameter of the through hole 23a, including the tapered hole 84 as the fitting recess 83. Of course, the taper-shaped portion 54 of the assembly bolt 50 is also configured as an outer diameter that is reduced in diameter from the male screw portion 52 that passes through the through hole 23a.

  The mounting of the airbag device S1 of the embodiment on a vehicle will be described. First, the retainer 45 is housed in the airbag 60 from the insertion hole 63 so that the male screw portion 52 of each assembly bolt 50 protrudes from the mounting hole 61. To do. Then, the airbag 60 is folded so as to be housed in the case 20, and the periphery is wrapped with a wrapping material (not shown) that can be broken to prevent it from collapsing. The portion of the insertion hole 63 is exposed from the wrapping material.

  Next, the inflator 40 is inserted into the main body portion 46 of the retainer 45 in the airbag 60 from the small diameter portion 42 side through the insertion hole 63, and is composed of the folded airbag 60, the inflator 40, and the retainer 45. The assembly preparation body P1 is formed.

  Then, as shown in FIG. 5A, in advance, each holding guide pin 81 protrudes upward away from the holding recess 71a through the insertion opening 71b of the case holder 71. The case 20 is held by a holding arm of an assembly device (not shown), the protruding opening 21 is directed upward, the bottom wall portion 23 is positioned downward, and the holding guide pin 81 is passed through the through hole 23a. 20 is lowered and placed in the holding recess 71 a of the case holder 71.

  At this time, the bottom wall 23 of the case 20 is first placed on the holding recess 71a of the case holder 71 with the protruding opening 21 facing upward by the holding arm of the assembling apparatus (not shown). The holding base 80 is raised, the holding guide pin 81 is passed through the through hole 23a of the bottom wall portion 23 of the case 20 held by the case holder 71, and the tapered hole portion 84 as a fitting recess is formed in the case. You may arrange | position above 20.

  Thereafter, as shown in FIG. 5B and FIG. 6, the assembly preparation body P <b> 1 is held by a holding arm of an assembly device (not shown), and the tapered portion 54 of the fitting convex portion 53 of each assembly bolt 50. Is fitted into the tapered hole portion 84 of the fitting recess 83 of the corresponding holding guide pin 81, and the tapered portion 54 is fitted into the tapered hole portion 84. At this time, the fitting shape of the tapered shape portion 54 as the fitting convex portion 53 of the assembly bolt 50 and the tapered hole portion 84 as the fitting concave portion 83 of the holding guide pin 81 is the preparation for assembly on the airbag 60 side. The body P1 is configured in a shape that can be held by the holding guide pin 81 in a self-standing state, and the assembly preparation body P1 is stable even if a holding arm (not shown) is removed from the assembly preparation body P1. The posture is maintained and held by holding guide pins 81, 81.

  Next, if the assembly preparation body P1 is pushed down together with the holding base 80 from the upper surface Pu side of the assembly preparation body P1 using the pusher 75 or the like, as shown in FIG. 5C and FIG. The guide pins 81, 81 are detached from the through holes 23a, the respective assembly bolts 50 pass through the through holes 23a, the male screw portions 52 project downward from the bottom wall portion 23, and at the same time, the assembly preparation body P1. The folded airbag 60 and inflator 40 are housed in the case 20.

  Thereafter, the holding guide pins 81, 81 are further lowered, detached from the assembly bolts 50, and the nuts 90 are fastened to the assembly bolts 50, whereby the retainer 45 is fixed to the bottom wall portion 23 of the case 20. Accordingly, the attachment portion 62 of the airbag 60 is sandwiched between the retainer 45 and the bottom wall portion 23 of the case 20, the airbag 60 is fixed to the case 20, and the inflator 40 is connected to the pressing portion of the retainer 45. 46b and the support projection 23b of the bottom wall 23 of the case 20 are fixed to the case 20, the assembly preparation body P1 is stored and fixed in the case 20, and the assembly of the airbag assembly AB1 is completed. It becomes.

  And if the peripheral wall part 14 of the airbag cover 10 is couple | bonded with the peripheral wall part 25 so that the latching claw part 28 may be latched by the latching hole 17, the airbag apparatus S1 can be assembled.

  Thereafter, the mounting piece 32 of the case 20 is fastened with a bolt 35 and fixed to the bracket 2, and the lead wire connector extending from the airbag operating circuit is passed through the insertion hole 33 of the case 20 to the connecting portion 41 a of the inflator 40. If the instrument panel 7 and the under cover 8 (see FIGS. 1 and 2) are attached to the vehicle body side, the airbag device S1 can be attached to the vehicle.

  If the operation signal is input to the inflator 40 after the airbag device S1 is mounted on the vehicle, the inflation gas is discharged from the gas discharge port 42a and flows into the airbag 60. The inflation gas is introduced to inflate, break the wrapping material (not shown), break the planned break portion 11c, push the door portions 11a, 11a of the airbag cover 10 open, and from the protruding opening 21 of the case 20 As shown by the two-dot chain line in FIG. 1, the expansion is completed in such a manner that the knee K of the driver D can be protected.

  In the assembly method of the airbag assembly AB1 of the embodiment, the fitting convex portion 53 at the tip of the assembling bolt 50 and the fitting concave portion 83 at the upper end of the holding guide pin 81 are fitted to each other. The assembly preparation body P1 on the folded airbag 60 side before being stored in the case 20 is configured as a fitting shape that can be placed on the holding guide pins 81 by being self-supporting. Therefore, when assembling, first, the case holder 71 of the assembling jig 70 is made to hold the case 20 with the protruding opening 21 side facing up and the bottom wall 23 side facing down, and each holding The guide pins 81 are projected upward through the through holes 23a of the case 20. Thereafter, the fitting convex portion 53 is fitted into the fitting concave portion 83, and the assembly guide body P <b> 1 is held by the holding guide pin 81. At this time, the assembly preparation body P1 itself on the airbag 60 side does not contact the holding guide pin 81 or the case 20, but simply holds the assembly preparation body P1 and fits the tip of the assembly bolt 50. Since the convex portion 53 can be fitted into the fitting concave portion 83 of the holding guide pin 81, the fitting convex portion 53 and the fitting concave portion 83 can be easily fitted to each other. Further, at the end of the fitting, the assembly preparation body P1 can stand on its own without falling down, and can stably maintain the posture held by the holding guide pins 81. If the assembly bolts 50 and the holding guide pins 81 are pushed down toward the case 20 along the axial direction, the assembly preparation body P1 can be moved while protruding the respective assembly bolts 50 from the through holes 23a of the bottom wall 23. It can be stored in the case 20. That is, if the fitting protrusion 53 is fitted to the fitting recess 83 so that the assembly preparation body P1 is placed on the holding guide pin 81, a member that supports the assembly preparation body P1 separately so as not to fall down is surrounded. After that, the assembly preparation body P1 is simply moved linearly so as to push down the assembly preparation body P1 along the axial direction of the assembly bolt 50 and the holding guide pin 81. By simply doing so, the airbag 60 and the inflator 40 can be smoothly accommodated in the case, and the assembly bolt 50 can be protruded from the through hole 23a.

  For this reason, the assembly bolt 50 can be easily fitted to the holding guide pin 81, and the movement after the fitting can be performed only by a linear pressing operation. Therefore, the assembly preparation body P1 can be easily automated. Can be stored in the case 20 and the assembly bolt 50 can be passed through the case 20.

  And after accommodating the assembly preparation body P1 in the case 20, if the nut 90 is fastened to each assembly bolt 50 projecting from the case 20, the airbag 60 and the inflator 40 are stably attached to the case 20. Can be stored and fixed.

  Therefore, in the assembly method of the airbag assembly AB1 of the first embodiment, the plurality of assembly bolts 50 for storing and fixing the folded airbag 60 and the inflator 40 in the case 20 can be easily attached to the case 20. It can be penetrated and automation can be facilitated.

  And in 1st Embodiment, the fitting convex part 53 is comprised from the assembly | attachment volt | bolt 50 which provided the fitting convex part 53, and the conical taper-shaped part 54 which made the axial center C1 correspond, and the fitting recessed part 83 is comprised. Is composed of a tapered hole portion 84 corresponding to the tapered shape portion 54, and the tapered shape portion 54 and the tapered hole portion 84 make the assembly preparation body P <b> 1 before being stored in the case 20 stand by itself when fitted to each other. It is configured as a fitting shape that can be arranged.

  Therefore, in the first embodiment, if the tapered portion 54 of the assembly bolt 50 is inserted into the tapered hole portion 84 of each holding guide pin 81, the inner peripheral surface 85 of the tapered hole portion 84 and the tapered portion 54 are By sliding the taper surfaces 85, 55 with the outer peripheral surface 55, the axes can be made coincident with each other, and even if there is a slight misalignment between the holding guide pin 81 and the assembly bolt 50, it can be easily corrected. Thus, the fitting can be performed while aligning, and the fitting work is facilitated.

  Furthermore, in the above configuration, the tapered surfaces 85 and 55 are fitted to each other between the inner peripheral surface of the tapered hole portion 84 and the outer peripheral surface of the tapered portion 54, and the assembly preparation body P1 on the airbag 60 side is self-supporting. A stable posture can be secured without rattling.

  Note that the taper angle θ1 and the length dimension L1 between the tapered portion 54 and the tapered hole portion 84 are only required to stably hold the assembly preparation body P1, and the assembly bolt 50 usually has a screw specification of about M5. In view of compactness and durability, the taper angle θ1 is 10 to 25 °, the length L1 is 2.0 to 7.0 mm, and the outer diameter d1 of the tip surface 56 of the tapered portion 54 is 2. .5-3.5φ is desirable.

  Moreover, as a fitting shape as a fitting convex part and a fitting recessed part, it is not necessary to make it into a taper shape. For example, like the airbag assembly AB2 of the airbag device S2 of the second embodiment shown in FIGS. 8 and 9, the fitting convex portion 53A of the tip of the assembly bolt 50A is on the tip side of the male screw portion 52. The assembly bolt 50 </ b> A and the shaft center may be aligned, and a columnar columnar portion 57 having a smaller diameter than the male screw portion 52 may be provided.

  As shown in FIG. 9, the fitting recess 83A on the holding guide pin 81A side corresponding to the fitting convex portion 53A corresponds to the columnar shape portion 57 and is fitted in a round hole shape to fit the columnar shape portion 57. A joint hole 87 is provided. Further, the fitting hole 87 is set to a depth dimension h in which the front end surface 58 of the columnar portion 57 is brought into contact with the bottom surface 88 thereof.

  The fitting convex portion 53A and the fitting concave portion 83A fit the columnar portion 57 and the fitting hole 87 at the time of mutual fitting, and are substantially orthogonal to the axis C1 of the assembly bolt 50A. The front end surface 58 and the bottom surface 88 which are parts in the direction are brought into contact with each other so that the assembly preparation body P2 on the side of the folded airbag 60 before being stored in the case 20 can be self-supported and disposed. ,It is configured.

  Also in the second embodiment, as shown in FIG. 10A, each holding guide pin 81A is previously projected upward through the insertion opening 71b of the case holder 71 and away from the holding recess 71a. In this state, the case 20 is held by a holding arm of an assembling apparatus (not shown), the protruding opening 21 is directed upward, the bottom wall portion 23 is positioned downward, and the holding guide pin 81A is placed in the through hole 23a. While penetrating, the case 20 is lowered and placed in the holding recess 71 a of the case holder 71.

  Thereafter, as shown in FIG. 10B and FIG. 11, the retainer 45 having the assembly bolt 50 </ b> A is stored and folded into the airbag 60 and the retainer 45 by the holding arm of the assembly device (not shown). The assembly body P2 including the inflator 40 is held, and the columnar shape portion 57 of the fitting convex portion 53A of each mounting bolt 50A is fitted to the fitting hole 87 of the fitting concave portion 83A of the corresponding holding guide pin 81A. The fitting convex portion 53A is fitted into the fitting concave portion 83A. At this time, the fitting shape between the fitting convex portion 53A of the assembly bolt 50A and the fitting concave portion 83A of the holding guide pin 81A is such that the columnar portion 57 is fitted into the fitting hole 87, and the columnar portion 57 The front end surface 58 is in contact with the bottom surface 88 of the fitting hole 87, and is configured in a shape that can maintain the state of being held by the holding guide pin 81A in a state where the assembly preparation body P2 is self-supporting. Even when the assembly preparation body P2 is removed, the assembly preparation body P2 maintains a stable posture and is held by the holding guide pins 81A and 81A.

  After that, if the assembly preparation body P2 is pushed down together with the holding base 80 from the upper surface Pu side of the assembly preparation body P2 using the pusher 75 or the like, as shown in FIG. 10C and FIG. The guide pins 81A and 81A are detached from the through holes 23a, the respective assembly bolts 50A pass through the through holes 23a, and the male screw portions 52 protrude downward from the bottom wall portion 23. At the same time, the assembly preparation body P2 The folded airbag 60 and inflator 40 are housed in the case 20.

  Thereafter, the holding guide pins 81A and 81A are further lowered to be detached from the assembly bolts 50A, and the retainers 45 are fixed to the bottom wall portion 23 of the case 20 by fastening the nuts 90 to the assembly bolts 50A. Accordingly, the attachment portion 62 of the airbag 60 is sandwiched between the retainer 45 and the bottom wall portion 23 of the case 20, the airbag 60 is fixed to the case 20, and the inflator 40 is connected to the pressing portion of the retainer 45. 46b and the support projection 23b of the bottom wall 23 of the case 20, the case 20 is fixed, the assembly preparation body P2 is housed and fixed in the case 20, and the airbag assembly AB2 is assembled. Completed.

  That is, also in the second embodiment, the columnar shape portion 57 and the fitting hole 87 can ensure stable independence of the assembly preparation body P2 at the time of mutual fitting. An effect can be obtained. Further, in the second embodiment, a step is provided at the tip of the assembly bolt 50A to provide a columnar shaped portion 57, and a corresponding fitting hole 87 is provided on the tip surface of the holding guide pin 81A. Since the tapered surfaces 55 and 85 do not have to be provided, the columnar portion 57 and the fitting hole 87 can be formed by easy processing.

  In the case of the second embodiment, as a configuration in which the axial center C1 of the assembly bolt 50A and the parts in a substantially orthogonal direction are brought into contact with each other, the front end surface 58 of the columnar portion 57 and the bottom surface 88 of the fitting hole 87 are abutted. Although it is configured to contact, the stepped portion of the male screw portion 52 with the columnar shape portion 57 and the periphery of the fitting hole 87 on the tip surface side of the holding guide pin 81A may be contacted.

  In the first and second embodiments, the airbag devices S1 and S2 are described by taking the knee protection airbag device as an example, but an airbag assembly to which the present invention is applicable is provided. The airbag device is not limited to this. For example, an airbag for a driver's seat mounted on a steering wheel may be used as long as the assembly preparation body on the airbag side is stored and fixed in a case using a retainer. The present invention can also be applied to an apparatus.

DESCRIPTION OF SYMBOLS 20 ... Case, 21 ... Projection opening, 23 ... Bottom wall part, 23a ... Through-hole, 45 ... Retainer, 50, 50A ... Assembly bolt, 52 ... Male screw part, 53, 53A ... (Fitting part) Fitting convexity 54, tapered shape portion / conical shape portion, 55 ... (outer peripheral surface) tapered surface, 57 ... columnar shape portion, 58 ... tip end surface, 60 ... airbag,
70 ... Assembly jig, 71 ... Case holder, 81, 81A ... Holding guide pin, 83, 83A ... (Fitting portion) Fitting recess, 84 ... Tapered hole portion, 85 ... (Inner peripheral surface) Tapered surface, 87: fitting hole,
C1 ... axis of assembly bolt
AB1, AB2 ... airbag assembly, P1, P2 ... assembly preparation, S1, S2 ... knee protection airbag devices.

Claims (3)

An airbag assembly includes a folded airbag, a case that stores the folded airbag, and a plurality of assembly bolts that are disposed in the folded airbag and project outside the airbag. And a retainer having
The assembly preparation body on the side of the airbag folded in a state in which the retainer is disposed while projecting each of the assembly bolts out of the case from the projecting opening side of the airbag in the case. An airbag assembly that is housed on the bottom wall portion side provided with a through-hole of an assembly bolt, and a nut is fastened to each assembly bolt that protrudes outside the case, and the airbag is fixed to the case and assembled. In the attachment method of the appendix,
A case holder for holding the case by positioning the bottom wall portion of the case on the lower side and positioning the protruding opening side on the upper side;
A plurality of holding guide pins that extend upward through a through-hole in the bottom wall portion from the lower side of the case holder, and move up and down integrally;
Use an assembly jig equipped with
A fitting portion that is fitted to each other is disposed at the upper end of each holding guide pin and the tip of the assembly bolt that corresponds to the holding guide pin.
The fitting portion on the assembly bolt side is configured as a fitting convex portion that protrudes along the axis of the assembly bolt from a male screw portion that is screwed into the nut of the assembly bolt,
The fitting portion on the holding guide pin side is configured as a fitting concave portion disposed on the front end surface of the holding guide pin so that the fitting convex portion can be fitted,
The fitting convex portion and the fitting concave portion are configured as a fitting shape that can be placed on the holding guide pin by allowing the assembly preparation body before being stored in the case to be self-supported when being fitted to each other. And
During assembly,
The case holder of the assembly jig holds the case, and the holding guide pins protrude upward through the through holes of the case,
The fitting convex part and the fitting concave part are fitted to each other, and the assembly preparation body is arranged on the holding guide pin,
The assembly guide body is pushed into the case while the holding guide pin is lowered so as to be pulled out from the through-hole, and the assembly bolts are assembled by projecting from the bottom wall portion of the case. An assembly method for the airbag assembly. The fitting convex portion includes a conical tapered shape portion whose axial center coincides with the assembly bolt provided with the fitting convex portion, and the fitting concave portion is a tapered hole corresponding to the tapered shape portion. Configured with parts,
The tapered shape portion and the tapered hole portion are configured as a fitting shape that can be placed by allowing the assembly preparation body before being stored in the case to stand by itself when fitted to each other. The method for assembling the airbag assembly according to claim 1. The fitting convex part includes a columnar columnar part having a diameter smaller than that of the male screw part by aligning the shaft center with the assembly bolt provided with the fitting convex part, and the fitting concave part is the columnar part. Equipped with a fitting hole corresponding to the shape part,
The columnar-shaped portion and the fitting hole are configured as shapes that can be placed by allowing the assembly preparation body before being stored in the case to stand by itself when fitted to each other. Item 2. An assembly method for an airbag assembly according to Item 1.

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