JP6421939B2 - Side curtain airbag - Google Patents

Description

  The present invention relates to a side curtain airbag.

  A side curtain airbag (hereinafter referred to as “curtain airbag”) that protects an occupant may be installed on the roof side portion of the vehicle when an impact is input during a side collision or rollover. This type of curtain airbag mainly includes a bag body that expands in a curtain shape when an impact is input, a protector that guides the expansion of the bag body, and an inflator that supplies gas to the bag body (for example, See Patent Document 1 below).

By the way, the bag body mentioned above is hold | maintained at the protector in the folded state in normal time (when not in use). Therefore, the curtain airbag has a long shape extending along the roof side portion in a state where the bag body is folded. In this case, when assembling the curtain airbag to the roof side, the operator needs to be careful so that the bag body is not twisted and assembled with the longitudinal direction of the curtain airbag as an axis.
Therefore, Patent Document 1 below discloses a configuration in which a twist preventing member is applied to the bag body, and the bag body and the twist preventing member are collectively covered with a heat shrink film.

International Publication No. 2014/129054

However, in the configuration of Patent Document 1 described above, there is a problem that the number of parts increases because separate parts such as a twist preventing member and a heat shrink film are required.
Moreover, after a bag body is coat | covered with a heat shrink film, there exists a subject that a bag body cannot be bent and transportability is bad.

  The present invention has been made in view of the above circumstances, and is a side curtain that can improve assemblability by suppressing twisting of a bag body while reducing the number of parts and improving transportability. An object is to provide an airbag.

  In order to achieve the above object, the invention described in claim 1 is a bag that is attached to a roof side portion (for example, the roof side portion 3 in the embodiment) that extends in the vehicle front-rear direction and expands in a curtain shape when an impact is input. A body (for example, the bag body 21 in the embodiment), a belt-shaped member extending from the bag body (for example, the belt-shaped member 41 in the embodiment), and holding the bag body to guide the development of the bag body, A plurality of protectors (for example, the protectors 22 to 24 in the embodiment) arranged at intervals in the vehicle front-rear direction, and an inflator (for example, the inflator 25 in the embodiment) for introducing gas into the bag body, The inflator is a first protector adjacent to the protector in the vehicle front-rear direction (for example, the central protector 23 in the embodiment). And the second protector (for example, the rear protector 24 in the embodiment) spanned between the bags, and the first end of the inflator located near the first protector is A second end portion that is inserted into the gas introduction path (for example, the gas introduction path 32 in the embodiment) of the bag body and is located closer to the second protector is a notch formed in the second protector (for example, the embodiment). In this case, it is connected to the belt-like member drawn out through the lead-out hole 55).

  The invention described in claim 2 is characterized in that the belt-like member is wound around the inflator.

  In the invention described in claim 3, the inflator is provided with a bracket (for example, the bracket 61 in the embodiment) for attaching the inflator to the roof side portion, and the bracket is a bracket fixing member (for example, in the embodiment). The inflator is fixed by a bracket fixing ring 65), and the belt-like member is connected to a position adjacent to the bracket fixing member in the second end portion of the inflator.

According to the first aspect of the present invention, the portion of the bag body that is positioned between the first protector and the second protector can be supported by the inflator, so that twisting of the bag body can be suppressed. Therefore, the assembly property of the curtain airbag can be improved.
Further, by supporting the bag body using the inflator, it is possible to reduce the number of parts as compared with a conventional structure in which the bag body is supported using another part.
Furthermore, since the portion located between the first protector and the second protector of the bag body can be folded and transported before the inflator is attached, the transportability can be improved.

  According to the invention described in claim 2, since the belt-like member is wound around the inflator, the belt-like member and the inflator can be firmly connected.

  According to the invention described in claim 3, the band-shaped member can be positioned in the front-rear direction by the bracket fixing member by connecting the band-shaped member to a position adjacent to the bracket fixing member in the second end portion of the inflator. it can. Thereby, alignment with an inflator and a bag becomes easy, and the assembly | attachment property of an inflator and a bag can be improved.

It is the side view which looked at the state where the curtain airbag which concerns on embodiment was attached to the vehicle from the outer side of the vehicle width direction. It is a partial expanded view of the bag which concerns on embodiment. It is the expanded side view which looked at the curtain airbag which concerns on embodiment from the outer side of the vehicle width direction. It is the expanded side view which looked at the curtain airbag which concerns on embodiment from the inner side of the vehicle width direction. It is an expansion perspective view of the curtain airbag which concerns on embodiment. It is sectional drawing equivalent to the VI-VI line of FIG. It is a top view of the back protector concerning other composition of an embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description, the directions such as front, rear, up, down, left and right are the same as those in the vehicle unless otherwise specified. In the figure, the arrow UP indicates the upward direction, and the arrow FR indicates the forward direction. In addition, since the side curtain airbag (hereinafter simply referred to as a curtain airbag) of the present embodiment has the same configuration on both sides in the vehicle width direction, in the following description, the curtain airbag on one side in the vehicle width direction will be described. explain.

<Curtain airbag>
FIG. 1 is a side view of a state in which the curtain airbag 1 is attached to the vehicle 2 as viewed from the outside in the vehicle width direction.
As shown in FIG. 1, the curtain airbag 1 is provided along the roof side portion 3 of the vehicle 2. In the present embodiment, the roof side portion 3 is a portion from the front pillar 11 through the roof side rail 12 to the rear pillar 13 and extends along the front-rear direction. Reference numeral 14 denotes a center pillar, which extends downward from the central portion of the roof side rail 12 in the front-rear direction. A front door opening 15 is defined below the roof side 3 and forward of the center pillar 14, and a rear door opening 16 is defined behind the center pillar 14. .

  The curtain airbag 1 mainly includes a bag body 21, protectors 22 to 24, and an inflator 25. The curtain airbag 1 is a device that inflates the bag body 21 with gas supplied from the inflator 25 at the time of a vehicle collision and deploys the bag body 21 in a curtain shape along the inner surface of the side portion of the passenger compartment.

(Bag)
FIG. 2 is a partial development view of the bag body 21.
As shown in FIG. 2, the bag body 21 is formed in a bag shape by sewing the outer peripheral portion of the overlapped base fabric over the entire periphery. The bag body 21 includes a deployment portion 31 that can be deployed in a curtain shape, and a gas introduction path 32 through which the gas supplied from the inflator 25 is circulated into the deployment portion 31.

The development part 31 is formed in a rectangular shape whose longitudinal direction is the front-rear direction when viewed from the side in the vehicle width direction. A plurality of tabs 33 for attaching the bag body 21 to the roof side portion 3 are connected to the upper edge portion of the development portion 31. The tabs 33 are arranged at intervals in the front-rear direction at the upper edge of the developed portion 31. Each tab 33 is connected to the development part 31 in a state of protruding upward from the upper edge of the development part 31.
The gas introduction path 32 protrudes upward from the central portion in the front-rear direction at the upper edge portion of the development portion 31. In the present embodiment, the gas introduction path 32 extends backward as it goes upward. A gas introduction port 35 for allowing gas to flow into the bag body 21 is formed at the distal end (upper end) of the gas introduction path 32.

  A band-like member 41 is disposed in a portion located rearward of the gas introduction path 32 at the upper edge portion of the development portion 31. The belt-like member 41 extends upward from the upper edge portion of the development portion 31. The width of the belt-like member 41 (the width in the front-rear direction) is wider at both ends in the extending direction (the vertical direction in the illustrated example) than at the center. Therefore, the belt-like member 41 includes a base wide portion 42 positioned at the base end portion in the extending direction, a wide end portion 43 positioned at the front end portion in the extending direction, and a width connecting the wide portions 42 and 43. And a narrow portion 44. The wide portions 42 and 43 are widened forward with respect to the narrow portion 44. Further, the belt-like member 41 may be formed integrally with the development part 31 or may be formed separately.

The base end wide portion 42 is formed with an insertion hole 45 penetrating the base end wide portion 42. The insertion hole 45 is a long hole whose longitudinal direction is the front-rear direction. In the illustrated example, the inner diameter of the insertion hole 45 in the longitudinal direction is narrower than the width of the narrow portion 44. However, the shape and inner diameter of the insertion hole 45 can be changed as appropriate.
A locking hole 46 that penetrates the wide tip portion 43 is formed in the wide tip portion 43. The locking hole 46 is a round hole whose inner diameter is smaller than the inner diameter in the longitudinal direction of the insertion hole 45. However, the shape and inner diameter of the locking hole 46 can be changed as appropriate.

  As shown in FIG. 1, the above-described bag body 21 is disposed along the roof side portion 3 in a state where the development portion 31 is folded. Therefore, the bag body 21 is formed in a long shape extending in the front-rear direction in the folded state. In addition, the folding method of the expansion | deployment part 31 can be changed suitably, such as a zigzag shape and a roll shape.

(Protector)
The protectors 22 to 24 hold the bag body 21 and guide the downward deployment of the bag body 21 (deployment portion 31). The protectors 22 to 24 cover the bag body 21 from the outer side and the upper side in the vehicle width direction, and open at least downward. Each of the protectors 22 to 24 is provided with a binding tape 51 that binds the protectors 22 to 24 and the developing portion 31. The binding tape 51 is made of, for example, cloth. The binding tape 51 is wound around the protectors 22 to 24 and the bag body 21, and a plurality of binding tapes 51 are provided at intervals in the front-rear direction. Thereby, the bag body 21 is hold | maintained in the protectors 22-24 in the folded state. In addition, the above-described tabs 33 penetrate the protectors 22 to 24 upward.

In the present embodiment, a plurality of protectors 22 to 24 are arranged in the front-rear direction. Specifically, the protectors 22 to 24 are a front protector 22, a central protector (first protector) 23, and a rear protector (second protector) 24.
The front protector 22 holds the front part of the development part 31 with the front end part of the development part 31 protruding.

FIG. 3 is an enlarged side view of the curtain airbag 1 as viewed from the outside in the vehicle width direction.
FIG. 4 is an enlarged side view of the curtain airbag 1 as viewed from the inside in the vehicle width direction.
As shown in FIGS. 3 and 4, the central protector 23 includes a deployment portion holding portion 52 and an introduction path holding portion 53.
The development part holding part 52 holds the central part of the development part 31 in the front-rear direction. The front end portion of the developing portion holding portion 52 overlaps the rear end portion of the front protector 22.
The introduction path holding part 53 bulges upward from the rear part of the development part holding part 52. The introduction path holding portion 53 holds the gas introduction path 32 of the bag body 21 and holds the front end portion of the inflator 25 described above. The rear end portion of the introduction path holding portion 53 is located behind the rear end portion of the developing portion holding portion 52.

FIG. 5 is an enlarged perspective view of the curtain airbag 1.
As shown in FIGS. 3 and 5, the rear protector 24 holds the rear part of the developing part 31. The rear protector 24 is arranged with a space in the front-rear direction with respect to the central protector 23. The separation distance between the central protector 23 and the rear protector 24 is set to be equal to or shorter than the length of the inflator 25 in the front-rear direction.

  In the front end portion of the rear protector 24, a lead-out hole (notch portion) 55 penetrating the rear protector 24 in the vertical direction is formed. The drawer hole 55 of this embodiment is surrounded by the rear protector 24. The above-described belt-like member 41 of the bag body 21 is inserted into the drawing hole 55. The band-like member 41 is drawn out above the rear protector 24 through the drawing hole 55. In this case, the belt-like member 41 is restricted from moving back and forth and left and right by the opening edge of the extraction hole 55. And the part which comprises the opening edge of the drawer | drawing-out hole 55 among the back side protectors 24 comprises the control part which controls the relative movement to the back side protector 24 to the front and rear, right and left.

(Inflator)
As shown in FIG. 4, the inflator 25 supplies gas into the bag body 21 to expand the bag body 21. The inflator 25 is formed in a cylindrical shape that extends in the front-rear direction. The inflator 25 is juxtaposed with the bag body 21 above the bag body 21. As shown in FIG. 3, a bracket 61 for fixing the inflator 25 to the roof side portion 3 is attached to the inflator 25.

As shown in FIG. 3, the bracket 61 includes a base portion 62 attached to the inflator 25 and an attachment piece 63 formed integrally with the base portion 62.
The base 62 is formed in an arc shape that follows the outer surface shape of the inflator 25 when viewed from the front and back. Both ends of the base 62 in the front-rear direction are bound to the inflator 25 by bracket fixing rings (bracket fixing members) 65. The bracket fixing ring 65 is made of metal, for example. The bracket fixing ring 65 has a crimping portion 66 that protrudes upward. The caulking portion 66 is formed by tightening (caulking) a part of the bracket fixing ring 65 in a state where the inflator 25 and the base portion 62 are inserted inside the bracket fixing ring 65.
The attachment piece 63 extends downward from the base portion 62. An attachment hole 64 is formed in the attachment piece 63 so as to penetrate the attachment piece 63 in the vehicle width direction.

  Here, as shown in FIGS. 3 and 4, the inflator 25 is connected to the central protector 23, the rear protector 24, and the bag body 21 in a state of being spanned between the central protector 23 and the rear protector 24 described above. Has been. Specifically, the front end portion (first end portion) of the inflator 25 is inserted into the gas introduction path 32 through the gas introduction port 35 of the bag body 21 described above. The front end portion of the inflator 25 is bound to the gas introduction path 32 by a bag fixing ring 71. The bag fixing ring 71 has a caulking portion 72 (see FIG. 3), like the bracket fixing ring 65 described above. That is, the bag fixing ring 71 binds the front end of the inflator 25 and the gas introduction path 32 by tightening a part of the inflator 25 while the front end of the inflator 25 is inserted into the gas introduction path 32. . Note that the front end portion of the inflator 25 is bound by the binding tape 51 together with the introduction path holding portion 53, the gas introduction path 32, and the development portion 31 described above.

6 is a cross-sectional view corresponding to the line VI-VI in FIG.
As shown in FIG. 6, the rear end portion (second end portion) of the inflator 25 is connected to the band-shaped member 41 described above. After the belt-like member 41 is wound around the inflator 25 once, the distal end portion is passed through the insertion hole 45 of the base end wide portion 42 and is further wound around the inflator 25. As shown in FIGS. 3 and 5, the locking hole 46 formed in the wide end portion 43 of the band-shaped member 41 is a bracket fixing ring adjacent to the band-shaped member 41 in the bracket fixing ring 65 described above. It is latched by the crimping part 66 of 65a. In this case, the narrow portion 44 of the belt-like member 41 functions as an escape portion that avoids interference with the bracket fixing ring 65a. Thereby, the rear end portion of the inflator 25 is connected to the bag body 21.

Thus, in this embodiment, it was set as the structure by which the inflator 25 was spanned between the center protector 23 and the rear side protector 24. FIG. Further, in the present embodiment, the front end portion of the inflator 25 is inserted into the gas introduction path 32 on the central protector 23 side, and the rear end portion of the inflator 25 is connected to the belt-like member 41.
According to this structure, since the part located between the center protector 23 and the rear side protector 24 among the bag bodies 21 (deployment part 31) can be supported by the inflator 25, the twist of the bag body 21 can be suppressed. Therefore, the assembly property of the curtain airbag 1 can be improved.
Moreover, by supporting the bag body 21 using the inflator 25, the number of parts can be reduced as compared with a configuration in which the bag body 21 is supported using another part as in the prior art.
Furthermore, in the state before attaching the inflator 25, since the part located between the center protector 23 and the rear protector 24 among the bag bodies 21 can be bent and transported, the transportability can also be improved.

  In the present embodiment, since the belt-like member 41 is wound around the inflator 25, the belt-like member 41 and the inflator 25 can be firmly connected.

In the present embodiment, the strip member 41 is disposed adjacent to the bracket fixing ring 65a, whereby the strip member 41 can be positioned in the front-rear direction by the bracket fixing ring 65a. Thereby, position alignment with the inflator 25 and the bag body 21 becomes easy, and the assembly property of the inflator 25 and the bag body 21 can be improved.
In particular, in this embodiment, the band-shaped member 41 can be easily connected to the inflator 25 by locking the locking hole 46 of the band-shaped member 41 to the caulking portion 66 of the bracket fixing ring 65. Further, the slack of the belt-like member 41 can be suppressed, and the belt-like member 41 and the inflator 25 can be firmly connected.

The technical scope of the present invention is not limited to the above-described embodiments, and includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention. In other words, the configuration described in the above-described embodiment is merely an example, and can be changed as appropriate.
For example, in the above-described embodiment, the case where the extraction hole 55 penetrating the rear protector 24 is employed as the notch of the present invention has been described. However, the present invention is not limited to this. That is, as long as the notch penetrates the rear protector 24, a part in the front-rear direction and the left-right direction may be opened. For example, like the notch 100 shown in FIG. 7, the front end edge of the rear protector 24 may be opened. In this case, it is preferable that a restriction portion 101 that restricts the forward movement of the belt-like member 41 is formed at the opening edge of the notch portion 100. In addition, the control part 101 is formed in L shape by planar view seen from upper direction.

In the above-described embodiment, the configuration in which the belt-like member 41 is wound around the inflator 25 has been described. However, the configuration is not limited thereto. That is, the belt-like member 41 can be connected to the inflator 25 by various methods.
In the above-described embodiment, the configuration in which the belt-like member 41 and the rear end portion of the inflator 25 are connected has been described. However, the configuration is not limited thereto, and the belt-like member may be connected to the front end portion of the inflator 25. Moreover, you may connect a strip | belt-shaped member separately to the front and rear both ends of the inflator 25, respectively.

  In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 1 ... Curtain airbag 2 ... Vehicle 3 ... Roof side part 21 ... Bag body 23 ... Central protector (1st protector)
24 ... Rear protector (second protector)
25 ... Inflator 32 ... Gas introduction passage 41 ... Band-shaped member 55 ... Lead-out hole (notch)
61 ... Bracket 65 ... Bracket fixing ring (bracket fixing member)
100 ... notch

Claims (3)

A bag that is attached to the roof side that extends in the longitudinal direction of the vehicle and that expands into a curtain when an impact is input,
A belt-like member extending from the bag,
While holding the bag body and guiding the development of the bag body, a plurality of protectors arranged at intervals in the vehicle front-rear direction,
An inflator for introducing gas into the bag body,
The inflator is juxtaposed with the bag body in a state of being bridged between the first protector and the second protector that are adjacent in the vehicle longitudinal direction among the protectors,
Of the inflator, a first end located closer to the first protector is inserted into a gas introduction path of the bag body, and a second end located closer to the second protector is formed in the second protector. A side curtain airbag, wherein the side curtain airbag is connected to the belt-like member drawn out through the notch.   The side curtain airbag according to claim 1, wherein the belt-shaped member is wound around the inflator. The inflator is provided with a bracket for attaching the inflator to the roof side portion,
The bracket fixes the inflator by a bracket fixing member,
3. The side curtain airbag according to claim 1, wherein the belt-shaped member is connected to a position adjacent to the bracket fixing member in the second end portion of the inflator.

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