JP6601337B2 - Head protection airbag device - Google Patents

Description

  The present invention is configured to cover a vehicle window when deployed and inflated, and is stored in an upper edge side of the window inside the vehicle, an inflator for supplying inflation gas to the airbag, and an inflator on the upper edge side of the window The head protection airbag apparatus of a structure provided with the attachment bracket attached to a body side.

  Conventionally, in a head protection airbag device, a cylindrical inlet for connecting an inflator has been formed in the airbag, and the gas discharge side of a substantially cylindrical inflator is inserted into the inlet. In this state, the inflator was connected to the inlet portion of the airbag using the fastening member.

  For example, the following patent document 1 shows an example. In Patent Document 1, an annular concave groove is formed on the outer peripheral surface of the inflator, and the gas discharge side of the inflator including the concave groove is inserted inside the airbag inlet portion, and tightened from the outside of the airbag. The airbag and the inflator are integrally connected by winding a resin band as an attachment member in the concave groove. Further, in this example, even when the airbag device is operated, even when the resin band is expanded with the airbag due to the pressure of the inflation gas, and the compressive force in the reduced diameter direction by the resin band is reduced, Since it is wound in the groove, it prevents the resin band from coming off from the inflator.

JP 2014-124965 A

  However, when adopting the above-described airbag fixing structure, the outer peripheral surface of the inflator must be provided with a groove processing, which impairs the versatility of the inflator. Moreover, when processing the outer peripheral surface of an inflator, the device for ensuring the durability of an inflator is needed. The present invention solves the above-mentioned problem, and prevents the inflow portion of the airbag from coming off using a tightening member and connecting it to the inflator without performing special processing on the outer peripheral surface of the inflator. It is an object of the present invention to provide an airbag device that can be used.

An airbag apparatus according to the present invention is configured to cover a vehicle window when deployed and inflated, and includes an airbag housed on an upper edge side of the window inside the vehicle and a gas discharge port portion. As a configuration comprising a substantially cylindrical inflator that supplies gas, and a mounting bracket that holds the inflator and is attached to the body side on the upper edge side of the window,
The airbag has a cylindrical inlet port connected to the inflator,
The mounting bracket is provided as a back connection part for connecting the inflow part of the airbag and the inflator to the gas discharge port side of the holding part for holding the inflator.
A wound portion in which an inner surface is brought into contact with the outer peripheral surface of the inflator and a ring-shaped fastening member is wound from the outer surface side;
It is partially formed in the circumferential direction of the inflator on the outflow direction side of the inflation gas into the airbag from the wound portion, and stands outward from the wound portion. And a protruding portion having a stepped surface,
With the projecting portion and the gas discharge port side of the inflator being disposed inside the inflow port portion of the airbag, the tightening member wound from the outside of the inflow port portion causes the winding The airbag and the inflator are fastened and fixed at the portion.

  In the head protection airbag device according to the present invention, the mounting bracket serves as a back connection part for connecting the inflow part of the airbag and the inflator, and causes the inner surface to abut against the outer peripheral surface of the inflator and the ring from the outer surface side. And a protrusion having a stepped surface rising outward from the wound portion, and this protrusion is on the gas discharge port side of the inflator At the same time, in a state of being disposed inside the inflow port portion of the airbag, the fastening by the fastening member is performed. In the head protection airbag device of the present invention, the protrusion is positioned on the outflow direction side of the inflation gas with respect to the wound portion around which the tightening member is wound. Even when the tightening member is expanded in diameter and the compressive force in the contraction direction is reduced, the movement of the tightening member toward the outflow direction of the expansion gas is caused by the protrusion (specifically, the step surface of the protrusion). Since the air inlet portion of the airbag is blocked and held between the stepped surface and the fastening member, it is possible to satisfactorily prevent the inlet portion from coming out of the inflator. Therefore, according to the head protection airbag device of the present invention, the air inlet portion of the airbag is prevented from being pulled out by using the fastening member without being specially processed on the outer peripheral surface of the inflator and connected to the inflator. Can do.

  In the head protection airbag device of the present invention, since the protrusion of the mounting bracket is partially formed in the circumferential direction instead of the entire circumference of the inflator, the protrusion is attached to the airbag together with the inflator. Even when inserting into the inlet portion, the insertion operation can be performed more easily than when the protruding portion is formed over the entire circumference in the circumferential direction.

  In the head protecting airbag device of the present invention, it is desirable to provide the protrusion for preventing the above-mentioned removal at the tip of the mounting bracket.

  Further, in the head protection airbag device of the present invention, the protruding portion has a diameter-expanded portion that is expanded outward from the wound portion, and an axial direction of the inflator continuously from the diameter-expanded portion. And a peripheral wall portion extending in a straight line. As for the protruding part intended to prevent detachment, for example, it is possible to bend and raise the end of the wound part upward to provide a stepped surface, but in that case the strength of the protruding part is insufficient. It is also conceivable that the insertion workability when the protruding portion is inserted into the airbag deteriorates. For this reason, in the present invention, the projecting portion is provided with a diameter-enlarged portion that is expanded outward than the wound portion, and a peripheral wall portion that extends continuously from the diameter-enlarged portion in the axial direction of the inflator. Is desirable.

  By doing in this way, while making the surface by the side of the to-be-wound part of an enlarged diameter part into a level | step difference surface, the rigidity of a protrusion part can be improved by the surrounding wall part extended in the axial direction of an inflator following an enlarged diameter part. In addition, since the end surface of the protruding portion changes from the radially upward direction in the enlarged diameter portion to the axially forward direction in the peripheral wall portion, it is difficult for the protruding portion to be caught during insertion into the airbag, and the end surface of the protruding portion becomes The insertion workability is improved as compared with the case of upward in the radial direction. Further, if a reduced diameter portion bent inward is provided following the peripheral wall portion and the end surface of the protruding portion is directed toward the inflator, the workability during the insertion operation can be further improved.

Moreover, in the head protection airbag device of the present invention, the holding portion of the mounting bracket includes a first wound portion formed on the gas discharge port portion side, and the first wound portion. Is provided with a second wound portion formed on the opposite side in the axial direction,
A first fastening member for fastening and fixing the airbag and the inflator together in the first wound portion;
In the second wound portion, the airbag and the inflator can be fixed to the holding portion by a second fastening member that fastens and fixes only the inflator.

  In the head protection airbag device according to the present invention, the protruding portion is provided on the mounting bracket so that the fastening member is prevented from coming off well. Therefore, the fastening device used when both the airbag and the inflator are fastened and fixed to the mounting bracket. Only one attachment member can be provided (the purpose of preventing the removal can be achieved with only one attachment member). For this reason, in the head protection airbag device of the present invention, the first fastening member that fastens and fixes both the airbag and the inflator, the second fastening member that fastens and fixes only the inflator, and the two With the fastening member, the airbag and the inflator can be fixed to the mounting bracket.

Here, in the head protection airbag device of the present invention, the same fastening member can be used in the first fastening member and the second fastening member.
The peripheral length of the second wound portion to which only the inflator is tightened and fixed is longer than the peripheral length of the first wound portion to which both the airbag and the inflator are fastened and fixed. Can be set to

  The first tightening member and the second tightening member have different tightening volumes depending on the presence or absence of an air bag, and different tightening work conditions for obtaining a predetermined compressive force. End up. Therefore, in the head protection airbag device of the present invention, by setting the circumference of the wound portion of the mounting bracket to be longer in the second wound portion than in the first wound portion. The volume of the tightening object including the wound portion can be adjusted, and the tightening member can be made common. As a result, parts management becomes easy, and the assembling work can be performed efficiently with the same tightening force.

  Further, in the head protecting airbag device of the present invention, a thick wall portion in which the cloth material constituting the inflow port portion is integrally joined in the folded state is provided at the edge of the opening of the inflow port portion in the airbag. I can keep it. When the fastening member is expanded in diameter by the gas pressure when the inflation gas is generated and the compressive force in the reduced diameter direction is reduced, even if the airbag may move in the removal direction with respect to the fastening member, If a thick wall portion is formed at the edge of the opening of the inflow port portion, the thick wall portion abuts against the fastening member to prevent the airbag from moving and prevent the airbag from coming off from the inflator. Can do.

It is the schematic front view which looked at the head protection airbag apparatus which is one Embodiment of this invention from the vehicle inside. It is a longitudinal cross-sectional view of the vehicle-mounted state of the head protection airbag device of the embodiment, and corresponds to the II-II portion of FIG. It is a longitudinal cross-sectional view of the vehicle mounted state of the head protection airbag device of the embodiment, and corresponds to the III-III portion of FIG. It is the front view and axial direction sectional drawing of a mounting bracket used in the head protection airbag apparatus of embodiment. B is a sectional view taken along the line BB of the mounting bracket of FIG. 4, C is a sectional view taken along the line CC, and D is a sectional view taken along the line DD. It is a schematic perspective view of the mounting bracket of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a state in which an airbag used in a head protection airbag device of an embodiment is flattened, and a view for sequentially explaining a state in which the airbag is folded and a wrapping material is wound. It is a figure explaining the process of attaching an airbag and an inflator to a mounting bracket. It is the figure which showed the state by which the airbag was fastened and fixed. It is a general | schematic partial expansion perspective view which shows the state which arranged the folding completion body and case formed by folding an airbag. It is a general | schematic partial expansion perspective view which shows the state which accommodated the folding completion body in the case and assembled the inflator to the case. It is operation | movement explanatory drawing of embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the head protection airbag device M of the present embodiment is configured so that the airbag 30 can be covered with the windows W1 and W2 so that the windows (side windows) W1 and W2 of the vehicle V can be covered when the inflation is completed. The upper edge side is folded and stored in the range from the front pillar portion FP to the vicinity of the upper portion of the rear pillar portion RP through the roof side rail portion RR. In the case of this embodiment, the vehicle V is configured such that one intermediate pillar portion CP is disposed between the front pillar portion FP and the rear pillar portion RP so as to be substantially along the vertical direction. As shown by the two-dot chain line in FIG. 1, the airbag 30 at the completion of the inflation includes the windows W1 and W2 and the intermediate pillar garnish 7 disposed in the intermediate pillar portion CP and the rear pillar disposed in the rear pillar portion RP. A part of the inside of the garnish 8 is also covered.

  As shown in FIGS. 1 to 3, the head protecting airbag device M includes an airbag 30, an inflator 12 that supplies inflation gas to the airbag 30, mounting brackets 17 and 26, mounting bolts 24 and 27, and fastening members. And a case 50, 52 for storing a folding completion body 45 formed by folding the airbag 30. The folded airbag 30 (folded body 45), inflator 12, and cases 50 and 52, including the mounting brackets 17 and 26, cover the vehicle interior I with the airbag cover 10 when mounted on the vehicle V. Is stored (see FIGS. 1 to 3). In the present embodiment, the airbag cover 10 includes a lower edge 5a of the front pillar garnish 5 that covers the inside of the front pillar portion FP, and a lower edge 6a of the roof head lining 6 that covers the inside of the roof side rail portion RR. , Is composed of.

  The front pillar garnish 5 and the roof head lining 6 are made of synthetic resin together with the intermediate pillar garnish 7 and the rear pillar garnish 8, and are members on the body 1 side in the front pillar portion FP and the roof side rail portion RR by attachment means (not shown). It is attached to the inner side I of an inner panel 2. The airbag cover 10 composed of the lower edges 5a and 6a of the front pillar garnish 5 and the roof head lining 6 is pushed by the airbag 30 so that the airbag 30 can be protruded when deployed and inflated. It is comprised so that 5a, 6a may be opened to the vehicle inside I (refer the dashed-two dotted line of FIG. 2).

  The inflator 12 supplies inflation gas to the airbag 30, and as shown in FIG. 1, the inflator 12 is a substantially cylindrical cylinder type that has a folding body 45 formed by folding the airbag 30 in the axial direction. It arrange | positions so that it may follow along an axial direction substantially. In the case of the present embodiment, the inflator 12 is configured so that the folding completion body 45 is in a region above the window W2, which is an upper region near the center in the front-rear direction of the folding completion body 45, as shown in FIGS. Adjacent to the upper side, it is arranged so that the axial direction is substantially along the front-rear direction. In the case of this embodiment, the inflator 12 has a substantially cylindrical main body 13 and a gas discharge port 14 disposed on one end side in the axial direction of the main body 13, as shown by a two-dot chain line in FIG. 4. And a connection port portion 15 disposed on the other end side in the axial direction of the main body portion 13.

  In the case of the present embodiment, the gas discharge port portion 14 is arranged on the front end 13a side of the main body portion 13, and has a gas discharge port (not shown) that is smaller in diameter than the main body portion 13 and that opens the expansion gas so as to be discharged. Many are arranged. The connection port portion 15 disposed on the rear end 13b side which is the other end side of the main body portion 13 is for connecting a connector (not shown) in which a lead wire for operating signal input is connected. The inflator 12 inserts the front end 13a side (gas discharge port portion 14 side) of the main body portion 13 into an inflow port portion 33 to be described later of the airbag 30, and the rear end 13b side (connection port portion 15 side) of the main body portion 13. ) Protrudes from the inlet portion 33 and is connected to the airbag 30 using the clamp 23 disposed on the outer peripheral side of the rear end 33a side of the inlet portion 33 (see FIG. 11).

  In the case of this embodiment, the main body part 13 of the inflator 12 has a rear end side part 13c on the connection port part 15 side slightly smaller in diameter so as to provide a step between the general part 13e and the rear end side part 13c. It is configured. The inflator 12 is attached to the inner panel 2 using an attachment bracket 17, a clamp 23, and attachment bolts 24 for fixing the attachment bracket 17 to the inner panel 2 on the body 1 side. In the present embodiment, two of the same clamps 23 are used, and a front end side clamp (first tightening member) used in a front end side wound portion (first wound portion) 19a described later. ) Is 23-1, and a rear end side clamp (second tightening member) used in the rear end side wound portion (second winding portion) 20a opposite to this is 23−. 2.

  In the case of this embodiment, the mounting bracket 17 is configured to be disposed so as to cover the vehicle outer side O of the inflator 12 as shown in FIG. Specifically, as shown in FIGS. 4 and 6, the mounting bracket 17 includes a holding portion 18 that holds the vehicle outer side O of the main body portion 13 of the inflator 12 over a predetermined length in the circumferential direction, and a holding portion 18. The mounting piece 22 is attached to the inner panel 2 on the body 1 side, and the fitting portion 21 extends rearward from the rear end side of the holding portion 18.

  As shown in FIG. 4, the holding portion 18 extends substantially along the front-rear direction so as to be wider than the attachment piece portion 22 in the front-rear direction so as to be able to cover the outer side of the inflator 12 except for the front and rear ends. It is long. The holding portion 18 is formed in a curved shape along the outer peripheral surface of the main body portion 13 of the inflator 12 (see FIGS. 2 and 5), and is configured to cover the outer peripheral surface side of the main body portion 13 without a substantial gap. ing. This holding part 18 is in a state where it is arranged so as to cover the outer peripheral side of the main body part 13 of the inflator 12, using a clamp 23 made of a sheet metal arranged on the outer peripheral side of the main body part 13 and the holding part 18, The inflator 12 is attached. Specifically, as shown by a two-dot chain line in FIG. 4, the clamp 23 has one on the front end side portion 19 disposed on the front side of the attachment piece portion 22 in the holding portion 18 and the attachment piece portion on the holding portion 18. A total of two are arranged, one on the rear end side portion 20 arranged on the rear side from the number 22.

  The front end side portion 19 in the holding portion 18 is a portion inserted into the inflow port portion 33 of the airbag 30 together with the inflator 12, and the clamp 23-1 disposed on the front end side is an inflow port in the airbag 30. It is arrange | positioned at the outer peripheral side of the part 33, and the inflator 12 will be attached to the attachment bracket 17 simultaneously with connecting the inflow port part 33 and the inflator 12 (refer FIG. 9).

  In the present embodiment, in the front end side portion 19, an area on the base end side that is the attachment piece 22 side (rear end side area) is a wound portion around which the clamp 23-1 is wound as shown in FIG. 4. 19a. Further, in the front end side portion 19, the front end side (front end side) portion is configured as a protruding portion 19 b, and the wound portion 19 a and the protruding portion 19 b are the inlet portion 33 and the inflator 17 of the airbag 30. And a connecting portion for back.

  As shown in the AA partial enlarged view of FIG. 4, the protruding portion 19b includes a diameter-enlarged portion 19ba that is expanded outward from the wound portion 19a, specifically, the outside of the vehicle, and a diameter-expanded portion 19ba. A peripheral wall portion 19bb extending continuously in the axial direction of the inflator 12, and a reduced diameter portion 19bc formed at the end of the peripheral wall portion 19bb opposite to the enlarged diameter portion 19ba. The surface of the expanded diameter portion 19ba on the wound portion 19a side is a step surface 19bd that stands outward from the wound portion 19a. The step surface 19bd is the outer peripheral side of the wound portion 19a. In addition, the clamp 23-1 that is wound around the air inlet portion 33 of the airbag 30 is formed as a retaining stopper.

  As shown in FIG. 5B, the peripheral wall portion 19bb is curved so that the shape of the cross section is along the outer peripheral surface of the inflator 12 at a radial height having a certain gap from the outer peripheral surface of the inflator 12. The peripheral wall portion 19bb is formed not in the entire circumference in the circumferential direction but partially in the circumferential direction (substantially in a halved shape). Moreover, as shown in the AA partial enlarged view of FIG. 4, the peripheral wall portion 19bb extends in the axial direction at the same radial height over a predetermined length. Thus, by providing the peripheral wall portion 19bb extending in the axial direction of the inflator 12 following the enlarged diameter portion 19ba, the rigidity of the protruding portion 19b can be increased. In the present embodiment, a reduced diameter portion 19bc is formed that is bent from the axial end portion (tip end portion) of the peripheral wall portion 19bb toward the radial inner side (inflator side). Thus, if the end surface of the projecting portion 19b is directed toward the inflator 12, it is possible to prevent the end portion of the projecting portion 19b from being caught when the projecting portion 19b is inserted into the airbag 30.

  Further, in the rear end side portion 20 of the mounting bracket 17, a region on the rear end side that is the side away from the mounting piece portion 22 is wrapped around the clamp 23 (23-2) as shown in FIG. 4. Part 20a. Unlike the wound portion 19a on the front end side, the rear end side wound portion 20a reduces the diameter of the clamp 23 without an airbag mounted around the wound portion (FIGS. 2 and 2). 5), the condition of the tightening operation for obtaining a predetermined compressive force is different from that of the wound portion 19a on the front end side. For this reason, in this embodiment, in order to adjust the shortage of the volume to be tightened due to the absence of the airbag, as shown by D in FIG. It is set longer than the side-wound portion 19a (see C in FIG. 5).

  The attachment piece 22 is configured to be disposed in a lower region in the approximate center before and after the inflator 12, and is fixed to the inner panel 2 on the body 1 side at two locations along the front-rear direction side. An insertion hole 22a through which a bolt 24 for this purpose can be inserted is opened (see FIGS. 2 and 4). Further, on both front and rear edges of the mounting piece 22, there are locking claws 22b that are locked to the periphery of a locking hole (not shown) formed on the inner panel 2 side and can temporarily fix the position of the mounting bracket 17. It is formed so as to protrude toward the vehicle outer side O on the panel 2 side.

  The fitting portion 21 can be inserted into a fitting hole 69 (see FIG. 10) formed in the case 52, and extends rearward from the rear end side of the holding portion 18 so that the shaft of the inflator 12 is extended. It is arrange | positioned along the direction (front-back direction) substantially.

  Each mounting bracket 26 is composed of two sheet metal plates. As shown in FIGS. 10 and 11, each mounting portion 38, which will be described later, of the airbag 30 is sandwiched from the front and back. Each attachment portion 38 is attached and fixed to the inner panel 2 on the body 1 side using bolts 27 (see FIG. 1).

  As shown by a two-dot chain line in FIG. 1, the airbag 30 is caused to flow inflating gas from the inflator 12 and expand from a folded state, so that the windows W1 and W2, the intermediate pillar portion CP, and the rear pillar are expanded. The intermediate pillar garnish 7 and the rear pillar garnish 8 in the portion RP are configured to expand and expand so as to cover the inside of the vehicle. As shown in FIG. 7A, the airbag 30 includes a gas inflow portion 31 that inflates to inflate an inflating gas and separates the vehicle inner wall portion 31a and the vehicle outer wall portion 31b, the vehicle inner wall portion 31a, the vehicle A non-inflow portion 36 that is formed so as to couple the outer side wall portions 31b and does not allow the inflation gas to flow in. In this embodiment, the gas inflow portion 31 includes a protective expansion portion 32 and an inflow port portion 33, and the non-inflow portion 36 includes a peripheral edge portion 37, an attachment portion 38, plate-like portions 39 and 40, and a closing portion 41. Is provided.

  As shown in FIG. 7A, the protective inflating portion 32 of the gas inflow portion 31 includes a front protective portion 32a that covers the window W1 on the side of the front seat and a side of the rear seat when the airbag 30 is completely inflated. And a rear protection portion 32b that covers the window W2. The front protective portion 32a and the rear protective portion 32b are plates that are narrowed in the front-rear direction width from the flatly deployed state when the airbag 30 is completely inflated, and that extend in the front-rear direction with a regulated thickness A closing portion 41 is arranged in the inner region so that the shape can be maintained.

  The inflow port portion 33 is configured to protrude upward from the upper edge side of the intermediate portion of the airbag 30 excluding the front and rear end edges, and in this embodiment, the rear end of the front protection portion 32a. It is arranged near the center in the front-rear direction, which is the vicinity. This inflow port portion 33 is formed so as to protrude upward from the upper edge 30a side of the airbag 30 while being inclined rearwardly, and an opening 33b is formed on the rear end 33a side so that the inflator 12 can be connected. Yes. In addition, on the rear end 33a side of the inflow port portion 33, as shown in FIG. 9, the cloth material constituting the inflow port portion 33 is folded outward, and the overlapped cloth materials are heated at the welding portion 33e. A thick portion 33c is formed at the periphery of the opening 33b by being integrally coupled by welding.

  The peripheral edge portion 37 in the non-inflow portion 36 is formed so as to surround the outer peripheral edge of the gas inflow portion 31 over the entire area except for the rear end 33a side of the inflow port portion 33. The plate-like portion 39 is disposed between the front protection portion 32a and the rear protection portion 32b, and has a substantially rectangular plate shape. The plate-like portion 40 is disposed on the front end side of the airbag 30 and has a substantially rectangular plate shape, and a belt portion 40a extending forward as a substantially belt-like shape is disposed on the lower end side.

  The attachment portion 38 is disposed on the upper edge 30a side when the airbag 30 is completely inflated, including the front end side of the belt portion 40a in the plate-like portion 40, and the upper edge 30a side of the airbag 30 is disposed on the vehicle side. It is a part for attaching to the inner panel 2 on the body 1 side of V. A plurality of attachment portions 38 are arranged along the front-rear direction (six in the case of the present embodiment), and as described above, the inner panel on the body 1 side using the attachment bracket 26 and the bolts 27. 2 will be attached.

  Then, from the state where the airbag 30 is flatly deployed so that the vehicle inner wall portion 31a and the vehicle outer wall portion 31b overlap each other, the lower edge 30b side is brought closer to the upper edge 30a side, as shown in FIG. The vehicle is folded and mounted on the vehicle V so as to form a long folding completion body 45 along the front-rear direction. In the present embodiment, as shown in FIGS. 2 and 3, the airbag 30 has an upper edge 30 a side region folded in a bellows, and a lower side region wound from the lower edge 30 b side toward the vehicle outer side O. Folded by roll folding. In the folding completion body 45, each attachment part 38 and the inflow port part 33 will be arrange | positioned so that it may protrude upward from the upper surface of the folding completion body 45, as shown to B of FIG.

  In the present embodiment, the case 52 projects the mounting portions 38 from the openings 53a formed in the storage portion 53 in a state in which the folding completion body 45 is stored therein, and the outer peripheral side of the storage portion 53. Therefore, the folded state of the folded body 45 in the case 52 is maintained by partially wrapping the wrapping material 75 that can be broken (see FIGS. 10 and 11).

  Next, the mounting of the head protection airbag device M of the present embodiment on the vehicle V will be described. First, the airbag 30 is folded as shown in FIG. In the case of this embodiment, from the state in which the airbag 30 is flattened with the vehicle interior side wall portion 31a and the vehicle outer side wall portion 31b overlapped, the region on the upper edge 30a side is folded in a fold substantially parallel to the upper edge 30a. At the same time, the bellows is folded, and the lower region is roll-folded so that the lower edge 30b is wound on the vehicle outer wall portion 31b side, thereby forming the folding completion body 45. Thereafter, a wrapping material 75 that can be broken is partially wound around the folding completion body 45 (see B in FIG. 7).

  Next, as shown in FIG. 8, the inflator 12 (main body portion) is attached to the wound portion 20 a on the rear end side of the mounting bracket 17 with the main body portion 13 of the inflator 12 being placed along the holding portion 18 of the mounting bracket 17. 13) and the diameter of the clamp 23-2 is reduced from the outer peripheral side of the mounting bracket 17, and the rear end side of the inflator 12 is mounted and fixed to the mounting bracket 17. On the other hand, the front end side of the inflator 12 is inserted into the inflow port portion 33 through the opening 33b of the airbag 30 (inflow port portion 33) together with the front end side portion 19 of the mounting bracket 17, and in this state, the front end of the mounting bracket 17 is inserted. The diameter of the clamp 23-1 is reduced from the outer peripheral side of the airbag 30 (inflow port portion 33) in the wound portion 19 a on the side. Note that the order of tightening and fixing the two clamps can be changed as appropriate.

  FIG. 9 is a view showing a state at that time, that is, a state in which the airbag 30 and the inflator 12 are fastened and fixed in the wound portion 19a. As shown in FIG. 7B, the inlet portion of the airbag 30 is formed from the outer peripheral side of the wound portion 19a in a state where the inner peripheral surface of the wound portion 19a is in contact with the outer peripheral surface of the inflator 12. A clamp 23 with a reduced diameter is wound around 33, and the airbag 30 and the inflator 12 are fastened and fixed to the mounting bracket 17.

  Thereafter, the folding completion body 45 is accommodated in the cases 50 and 52, and the wrapping material 75 is wound around the cases 50 and 52 and the folding completion body 45 from the outer peripheral side of the cases 50 and 52. Then, the inflator 12 is moved rearward along the axial direction so that the rear end portion 13c of the main body 13 is inserted into the insertion hole 57, and at the same time, the fitting portion 21 of the mounting bracket 17 is fitted. If the inflator 12 is assembled into the assembly portion 55 of the case 52 by being inserted through the insertion opening of the joint hole portion 69, an airbag assembly AM as shown in FIG. 11 can be formed.

  Then, the mounting brackets 17 and 26 are arranged at predetermined positions on the inner panel 2 on the body 1 side, are fastened with bolts 24 and 27, and lead wires (not shown) extending from a predetermined control device for inflator operation are connected to the inflator 12. If the front pillar garnish 5 and the roof head lining 6 are attached to the inner panel 2 on the body 1 side, and the pillar garnishes 7 and 8 are attached to the inner panel 2 on the body 1 side, the head is protected. The airbag device M can be mounted on the vehicle V.

  After the head protection airbag device M is mounted on the vehicle V, the inflation gas discharged from the inflator 12 flows into the airbag 30 if the inflator 12 is activated in response to an operation signal from the control device. The inflating airbag 30 is deployed while pushing the airbag cover 10 open and projecting downward, and as shown by the two-dot chain line in FIG. 1, the interior side of the windows W1, W2, the intermediate pillar portion CP, and the rear pillar portion RP Expansion will be completed so that it may cover.

  In the head protection airbag device M of this embodiment, the following actions and effects can be obtained.

  In this head protection airbag device M, as shown in FIG. 9 and the like, the mounting bracket 17 causes the inner surface to contact the outer peripheral surface of the inflator 12, and the clamp 23-1 is wound from the outer surface side. 19a and a projecting portion 19b having a stepped surface 19bd standing outward from the wound portion 19a. The projecting portion 19b together with the gas discharge port portion 14 side of the inflator 12 is provided on the airbag 30. The clamp 23-1 is fastened and fixed in a state of being inserted into the inflow port portion 33.

  In this head protection airbag device M, as shown in FIG. 12A, the protruding portion 19b is positioned on the outflow direction side of the inflation gas G with respect to the wound portion 19a around which the clamp 23-1 is wound. Therefore, when the inflation gas G is generated, the gas pressure increases the diameter of the clamp 23-1 together with the inflow port 33 of the airbag 30, and the compression force of the clamp 23-1 is reduced. The movement of the clamp 23-1 to the outflow direction side (left direction in the figure) of the inflation gas G is blocked by the protrusion 19b (specifically, the step surface 19bd), and the inflow port 33 of the airbag 30 becomes the step surface 19bd. Therefore, the inflow port portion 33 can be satisfactorily prevented from falling out of the inflator 12. Therefore, according to the head protection airbag device M, the clamp 23-1 is used to prevent the inflator 12 from slipping out of the inlet portion 33 of the airbag 30 without performing special processing on the outer peripheral surface of the inflator 12. Can be connected.

  Further, in the head protection airbag device M, the protruding portion 19b of the mounting bracket 17 is partially formed in the circumferential direction instead of the entire circumference in the circumferential direction of the inflator 12, so that the mounting bracket 17 projects together with the inflator 12. Even when the portion 19b is inserted into the inflow port portion 33 of the airbag 30, the insertion operation can be performed more easily than when the protruding portion is formed over the entire circumference.

  Further, in the head protecting airbag device M, as shown in FIG. 12B, the cloth material constituting the inlet portion 33 is folded in the edge portion of the opening 33 b of the inlet portion 33 in the airbag 30. Even when a thrust force in the left direction in the figure acts on the airbag 30 by the gas pressure when the inflation gas G is generated, the thick portion 33c is integrally connected. The airbag 30 is prevented from moving by contacting the clamp 23-1, and the airbag 30 can be prevented from coming off from the inflator 12.

  Further, in the head protecting airbag device M, the protruding portion 19b is provided with an enlarged diameter portion 19ba and a peripheral wall portion 19bb extending continuously from the enlarged diameter portion 19ba in the axial direction of the inflator 12, for example, The rigidity of the protruding portion can be increased as compared with the case where the end portion of the attachment portion is bent upward and provided with a stepped surface for retaining. Further, since the end surface of the protruding portion 19b changes from the upward in the radial direction at the enlarged diameter portion 19ba to the front in the axial direction at the peripheral wall portion 19bb, it is difficult for the protruding portion 19b to be caught during insertion into the airbag 30. Insertion workability is improved. Further, in the head protection airbag device M, the diameter-reduced portion 19bc that is bent inward is provided after the peripheral wall portion 19bb, and the end surface of the protruding portion 19b faces the inflator 12, so that the insertion work is further performed. Workability at the time can be improved.

  As described above, in the head protection airbag device M, the protrusions 19b are provided on the mounting bracket 17 so that the clamp 23 can be prevented from coming off. Therefore, both the airbag 30 and the inflator 12 are fastened to the mounting bracket 17. Only one clamp 23 on the front end side to be fixed is used (the purpose of preventing removal can be achieved with only one clamp 23). For this reason, the front end side clamp 23-1 for fastening and fixing the airbag 30 and the inflator 12 together, the rear end side clamp 23-2 for fastening and fixing only the inflator 12, and these two clamps (tightening) By the member, the airbag 30 and the inflator 12 can be fixed to the mounting bracket 17.

  However, the clamps 23-1 on the front end side and the clamps 23-2 on the rear end side have different volumes to be tightened depending on the presence or absence of the airbag 30, and the conditions of the tightening operation for obtaining a predetermined compressive force. Will be different. Therefore, in the head protection airbag device M, the circumference of the wound portion of the mounting bracket 17 is set to be longer at the wound portion 20a on the rear end side than the wound portion 19a on the front end side. Thus, the volume of the tightening target including the wound portion is adjusted, and the clamp 23 is made common. As a result, parts management becomes easy, and the assembling work can be performed efficiently with the same tightening force.

  Although the embodiment of the present invention has been described in detail above, this is merely an example. In the present embodiment, the gas discharge port portion of the inflator is disposed on the front end side, but in some cases, the gas discharge port portion of the inflator can be disposed on the rear end side. In addition, the tightening member to be used can be appropriately applied as long as it is wound from the outer peripheral side to generate a compressive force in the diameter reducing direction, and the present invention has been variously modified without departing from the gist thereof. It can be implemented in an embodiment.

DESCRIPTION OF SYMBOLS 1 ... Body, 12 ... Inflator, 14 ... Gas discharge port part, 17 ... Mounting bracket, 18 ... Holding part, 19a ... Wound part (1st to-be-wound part), 19b ... Projection part (bag connection part) ), 19ba ... enlarged diameter part, 19bb ... peripheral wall part, 19bd ... stepped surface, 20a ... wound part (second wound part), 23 ... clamp (clamping member), 23-1 ... on the front end side Clamp (first tightening member), 23-2 ... Rear end side clamp (second tightening member), 30 ... Air bag, 33 ... Inlet port, 33b ... Opening, 33c ... Thick part, W1 , W2 ... window, V ... vehicle, M ... head protection airbag device.

Claims (4)

An airbag that covers a vehicle window when deployed and inflated and is housed on the upper edge side of the window inside the vehicle, and a substantially cylindrical inflator that has a gas discharge port and supplies inflation gas to the airbag And a mounting bracket that holds the inflator and is attached to the body side on the upper edge side of the window,
The airbag has a cylindrical inlet port connected to the inflator,
The mounting bracket is provided as a back connection part for connecting the inflow part of the airbag and the inflator to the gas discharge port side of the holding part for holding the inflator.
A wound portion in which an inner surface is brought into contact with the outer peripheral surface of the inflator and a ring-shaped fastening member is wound from the outer surface side;
It is partially formed in the circumferential direction of the inflator on the outflow direction side of the inflation gas into the airbag from the wound portion, and stands outward from the wound portion. And a protruding portion having a stepped surface,
With the projecting portion and the gas discharge port side of the inflator being disposed inside the inflow port portion of the airbag, the tightening member wound from the outside of the inflow port portion causes the winding The airbag and inflator are fastened and fixed at the section ,
The holding portion of the mounting bracket includes a first wound portion formed on the gas discharge port portion side and a second wound portion formed on the opposite side of the first wound portion in the axial direction. A wound portion, and
A first fastening member for fastening and fixing the airbag and the inflator together in the first wound portion;
In the second wound portion, the airbag and the inflator are fixed to the holding portion by a second fastening member that fastens and fixes only the inflator ,
The first fastening member and the second fastening member can use the same fastening member,
The peripheral length of the second wound portion to which only the inflator is tightened and fixed is longer than the peripheral length of the first wound portion to which both the airbag and the inflator are fastened and fixed. A head protecting airbag device, characterized in that the head protecting airbag device is set. An airbag that covers a vehicle window when deployed and inflated and is housed on the upper edge side of the window inside the vehicle, and a substantially cylindrical inflator that has a gas discharge port and supplies inflation gas to the airbag And a mounting bracket that holds the inflator and is attached to the body side on the upper edge side of the window,
The airbag has a cylindrical inlet port connected to the inflator,
The mounting bracket is provided as a back connection part for connecting the inflow part of the airbag and the inflator to the gas discharge port side of the holding part for holding the inflator.
A wound portion in which an inner surface is brought into contact with the outer peripheral surface of the inflator and a ring-shaped fastening member is wound from the outer surface side;
It is partially formed in the circumferential direction of the inflator on the outflow direction side of the inflation gas into the airbag from the wound portion, and stands outward from the wound portion. And a protruding portion having a stepped surface,
With the projecting portion and the gas discharge port side of the inflator being disposed inside the inflow port portion of the airbag, the tightening member wound from the outside of the inflow port portion causes the winding The airbag and inflator are fastened and fixed at the section ,
The protruding portion is provided at a position on the outflow direction side of the inflation gas with respect to the fastening member and at a position in contact with the outer peripheral surface of the inflator. A head protecting airbag device comprising: a diameter-enlarged portion that is expanded outwardly, and a peripheral wall portion that extends continuously from the expanded-diameter portion in the axial direction of the inflator. The head-protecting airbag device according to claim 2, wherein the enlarged-diameter portion is partially formed in a circumferential direction of the inflator. The projecting portion is formed with a reduced diameter portion following the peripheral wall portion,
3. The head protection airbag device according to claim 2, wherein the reduced diameter portion is inclined from an end portion of the peripheral wall portion toward the inflator in a cross-sectional view along the axial direction.

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