JP2013028241A - Seat belt for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt for a vehicle in which an air bag part is satisfactorily widen when expanded, thereby absorbing and easing impact applied on an occupant.SOLUTION: In the seat belt for a vehicle, a belt body includes an airbag part 11 having a texture of one surface and a texture of the other surface which are woven by hollow weave. The airbag part 11 includes a tether 2 formed by folding both width-direction end parts 11a formed widely toward inside and restricting the development in the thickness direction. The tether 2 is formed by a weft and/or warp bridged from one texture to the other texture in the texture of one surface side and the texture of the other surface side. It is preferable that the tether 2 is formed by a weft bridged between the width-direction end part 11 b of one texture and the center part 11c of the other texture in the texture of one surface side and the texture of the other surface side.

Description

  The present invention relates to a vehicle seat belt provided with an airbag portion that expands and absorbs an impact applied to an occupant, particularly an impact applied to a shoulder and a chest, when the vehicle collides. More specifically, the present invention can absorb and relieve an impact applied to the occupant, particularly the shoulder and chest, in the event of a collision, etc., since the airbag portion is sufficiently widened during deployment and does not become excessively thick. The present invention relates to a vehicle seat belt that can be used.

  Conventionally, a seat belt is attached to a vehicle in order to protect an occupant from an impact at the time of a vehicle collision or the like. In addition, various airbags such as a front airbag and a side airbag are usually arranged on the assumption that the seat belt is worn. In these airbags, it is necessary to regulate the thickness at the time of deployment. However, when the fabrics on the front and back sides are directly stitched together, the stitched portion does not expand at all. Therefore, the thickness is regulated by providing a tether inside instead of stitching, but the wide tether influences the gas flow, so it is arranged so as not to hinder the deployment of the airbag There is a need.

  Furthermore, the seatbelt cannot be made excessively wide in order to achieve both operability at the time of attachment / detachment and wearing feeling, that is, the functionality at the time of attachment / detachment and the comfort at the time of attachment. Therefore, the width of the pelt is naturally limited, and a local load from the seat belt is applied to the occupant during a collision or the like. In order to relieve the local load caused by such a seat belt, a seat belt having an airbag function has been proposed and put into practical use. For example, belt belts such as an inflatable seat belt having a folded structure in which a specific upper web layer and a lower web layer are woven are known (for example, see Patent Document 1), and in the event of an accident. In this case, it is explained that the appropriate buffer protection for passengers is ensured, and that it is advantageous in terms of cost.

  Further, an air belt including a gas outflow regulating member having a lid that covers a vent hole and a tether is also known (see, for example, Patent Document 2), and when the chest facing surface is pressed, the tether relaxes, It is described that the vent hole is opened. And a spacer for limiting the distance between the fabric layers, wherein the warp and weft extend toward the opposite fabric layer and are connected to the warp and / or weft of the opposite fabric layer to form the spacer. Gas bags are known (see, for example, Patent Document 3), and the action of the spacer is described as preventing the gas bag from excessively inflating.

JP-T-2002-502918 JP 2009-298349 A JP 2001-138852 A

  However, in the belt belt-like material described in Patent Document 1, since the end portions and the like are sewn, a sewing process is essential, the man-hours are large, the sewn end portions are thick, and the wearing feeling is always good. I can't say that. Further, the air belt described in Patent Document 2 requires a step of producing a tether as a separate member and a step of attaching the tether, which is disadvantageous in terms of the number of parts and the number of man-hours. Furthermore, in the gas bag described in Patent Document 3, the spacer is formed at the time of weaving the fabric layer. In this gas bag, although it is intended to prevent excessive swelling, the spacer has a thickness when expanded. No particular mention is made of the characteristics required particularly for the seat belt airbag, such as suppressing the width and widening as much as possible, and sufficiently absorbing and mitigating the impact on the occupant. Moreover, in the gas bag described in patent document 3, the structure folded in the width direction is not intended at all.

  The present invention has been made in view of the above-described conventional situation, and the airbag portion is sufficiently widened at the time of deployment and is not excessively thick. An object of the present invention is to provide a vehicle seat belt capable of absorbing and mitigating applied impact.

The present invention is as follows.
1. In vehicle seat belts,
The vehicle seat belt includes a belt body,
The belt body includes an airbag portion having a woven fabric on one side and a woven fabric on the other side woven by bag weaving,
The airbag portion includes a tether that is formed by weaving both ends in the width direction formed in a wide direction inwardly and restricting the expansion in the thickness direction. Seat belt.
2. The tether is formed by at least one of a weft and a warp spanned from one woven fabric to the other woven fabric of the one side woven fabric and the other side woven fabric during the weaving. 1. The vehicle seat belt described in 1.
3. The tether is formed by a weft spanned between an end in the width direction of one of the woven fabric on the one surface side and the woven fabric on the other surface side and a central portion in the width direction of the other woven fabric. 2. The vehicle seat belt described in 1.

In the vehicle seat belt of the present invention, both end portions in the width direction of the airbag unit woven by bag weaving are woven inward, and there is no great difference in thickness in the width direction. Good wearing feeling during normal use. Further, at the time of a collision or the like, the airbag portion to be deployed is sufficiently widened and the thickness is regulated by the tether. Therefore, while securing the inherent restraint force of the seat belt, the wide and thick airbag portion can sufficiently absorb and mitigate the impact applied to the occupant, particularly the impact applied to the shoulder and chest. Furthermore, since the airbag portion is provided in the belt body itself, the structure can be simplified as a whole.
In addition, when the tether is formed by at least one of the weft and the warp yarns spanned from one woven fabric to the other woven fabric at the time of weaving, There is no need for a step of producing a tether as a separate member and a step of attaching the tether to the inner surface of the airbag portion by sewing or the like, which is extremely advantageous in terms of the number of parts and the number of man-hours. Furthermore, compared with a conventional tether made of a woven fabric or the like, when the gas flows in and the airbag portion is deployed, the gas flow is not hindered by the tether.
Further, the tether is formed by a weft spanned between the widthwise end of one of the one side woven fabric and the other side woven fabric and the widthwise central portion of the other woven fabric. When it is woven, both ends in the width direction of the airbag portion can be woven without being disturbed by the tether, and it can be easily made into a vehicle seat belt with a predetermined width. Can do. Moreover, it can be set as the airbag part which does not have a big difference in the thickness of the width direction.

It is a typical perspective view of a vehicle seat and an attached vehicle seat belt. FIG. 2 is a schematic perspective view for explaining a state in which an airbag portion provided in a belt main body of the vehicle seat belt in FIG. 1 is deployed. It is the schematic of the cross section of the airbag part of the vehicle seatbelt of this invention by which the both ends of the width direction were woven inward, and were made into predetermined width. FIG. 4 is a schematic diagram for explaining a state in which the airbag portion of the vehicle seat belt in FIG. 3 is deployed and both end portions project outward and are widened and thickened. It is a schematic diagram for demonstrating a mode that the expansion | deployment to the thickness direction of an airbag part is controlled by the tether part. It is a schematic diagram for demonstrating a mode provided with more tethers and being regulated so that the thickness of the developed airbag part may become more constant. FIG. 7 is a diagram before the airbag portion of the vehicle seat belt in FIG. 6 is deployed, and is a schematic cross-sectional view of the airbag portion in which both end portions in the width direction are woven inward and have a predetermined width. . FIG. 3 is a schematic perspective view seen from an oblique direction in order to three-dimensionally explain a tether provided by wefts.

Hereinafter, the present invention will be described in detail with reference to FIGS.
The items shown here are for illustrative purposes and exemplary embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

  The vehicle seat belt of the present invention includes a belt body 1, and the belt body 1 includes an airbag portion 11 having a woven fabric on one side and a woven fabric on the other side woven by bag weaving (see FIGS. 1 and 2). ). Moreover, the airbag part 11 is provided with the tether 2 which regulates the expansion | deployment to a thickness direction while the both-ends part 11a of the width direction formed wide is woven inwardly, and is formed (FIG. 3 and 7).

  The “belt body 1” includes an airbag portion 11 and a non-airbag portion 12 connected to both end portions in the length direction of the airbag portion 11 (see FIGS. 1 and 2). The belt body 1 is not only the airbag portion 11 but also the non-airbag portion 12 is usually woven by bag weaving, and the entire belt body 1 is woven by bag weaving on one side and the other side woven fabric. Have Thus, if the airbag part 11 and the non-airbag part 12 are both woven by bag weaving, the entire belt body 1 including the airbag part 11 and the non-airbag part 12 is woven continuously and integrally. This is preferable.

  When the airbag portion 11 and the non-airbag portion 12, that is, the entire belt body 1 is woven by bag weaving, the fabric structure is not particularly limited. For example, a plain weave structure, an oblique structure, an oblique structure, a satin structure It can be set as various textile structures, such as. In addition, the woven structure of the woven fabric constituting each of the airbag portion 11 and the non-airbag portion 12 is not particularly limited, and the woven fabric in which the belt body 1 does not become too rigid and the feeling of wearing as a seat belt is not impaired. An organization is preferred.

[1] Airbag portion The “airbag portion 11” is made of a woven fabric woven by bag weaving, has a woven fabric on one surface side and a woven fabric on the other surface side, and has both ends 11a in the width direction formed wide. Is folded inward (see FIGS. 3 and 7). The airbag portion 11 is provided in the middle portion of the belt body 1 in the longitudinal direction. When an impact is applied due to a vehicle collision or the like, for example, high-pressure gas ejected from the inflator 3 flows into the interior and deploys. As the width increases, the thickness increases (see FIG. 4), and the impact applied to the occupant, particularly the impact applied to the shoulder and chest, is reduced (see FIG. 2).

  Further, the width of both end portions 11a of the airbag portion 11 is not particularly limited, but when the both end portions 11a (see FIGS. 4 and 6) are folded inward (see FIGS. 3 and 7), the side end portions are The width of the belt main body 1 needs to be a width that does not greatly protrude outward beyond the side end of the non-airbag portion 12 (see FIGS. 1 and 2). Furthermore, the side end when the both end portions 11a of the airbag portion 11 are folded inward (refer to the position of the reference numeral 11b in FIGS. 3 and 7) and the side end portion of the non-airbag portion 12 are wide. It is preferable that the airbag portion 11 and the non-airbag portion 12 at the time of non-deployment have substantially the same width in the width direction. On the other hand, the airbag portion 11 is preferably wider when deployed from the viewpoint of shock mitigation, and the width when the airbag portion 11 is deployed is 1.2 to 3.0 times the width when not deployed. It can be.

  Further, in the seat belt functioning as an airbag like the vehicle seat belt of the present invention, the airbag portion 11 may be wider than the thickness thereof as described above from the viewpoint of impact mitigation. More preferred. Therefore, the airbag portion 11 is provided with a tether 2 that restricts the deployment of the airbag portion 11 in the thickness direction when deployed (a perspective view for explaining the tether 2 and the tether 2 three-dimensionally). (See FIG. 8). By providing such a tether 2, deployment of the airbag portion 11 in the thickness direction is suppressed, the airbag portion 11 is sufficiently widened, and an impact on the occupant is absorbed and relaxed.

  The method of providing the tether 2 is not particularly limited, but when weaving the airbag portion 11, wefts and / or warps spanned from one woven fabric to the other woven fabric on the one side woven fabric and the other side woven fabric. (See FIGS. 3 to 8). The tether 2 can be provided by a method of sewing a woven fabric previously woven as a separate member to each inner surface of the woven fabric on one side and the woven fabric on the other side, but it is disadvantageous in terms of the number of parts and man-hours. It is. On the other hand, the method of providing the tether 2 by laying the weft and / or warp from one woven fabric to the other woven fabric simultaneously with the weaving of the airbag portion 11 is advantageous in terms of both work efficiency and cost. .

  As described above, when the tether 2 is provided using the weft and / or the warp, a part of the weft and / or the warp of the woven fabric on the one side is separated from the woven fabric on the one side at a certain weaving point and separated by a predetermined dimension. The tether 2 spanned from one woven fabric to the other woven fabric can be formed by weaving into the woven fabric on the other surface side. Similarly, the tether 2 spanned from the other woven fabric to the one woven fabric can be formed.

  The weaving point for separating the weft and / or warp from the one side fabric and the other side fabric, and the position where the separated weft and / or warp is woven into the other side fabric and the one side fabric are particularly limited. Not. The length of the tether 2 is determined by the weaving point at which the yarn is separated on the one side and the other side, and the position where the yarn is woven on the other side and the one side. The length of the tether 2 determines the length of the airbag. The development of the portion 11 in the thickness direction is adjusted. For this reason, it is preferable to set the weaving point and the weaving position in consideration of the widening of the airbag portion 11 and the increase in thickness.

  Although the position where the tether 2 is bridged between the woven fabrics on the one side and the other side is not particularly limited as described above, the tether 2 is bridged from the woven fabric on the one side to the woven fabric on the other side. And the tether 2 spanned from the woven fabric on the other surface side to the woven fabric on the one surface side is preferably provided so as to intersect (see FIGS. 3, 4 and 6, 7, etc.). Thus, when the tether 2 is provided so as to intersect, when the airbag portion 11 is deployed, the fabric is expanded in the surface direction such as the width direction and the airbag portion 11 is deployed in the thickness direction. And the air bag portion 11 having a predetermined three-dimensional shape can be easily obtained (see FIGS. 5 and 6).

  The tether 2 may be provided evenly on the entire surface of the airbag portion 11 or may be provided unevenly. Furthermore, the length of the tether 2 may be substantially the same over the entire surface of the airbag unit 11 or may be different in the surface direction. If the tether 2 is provided uniformly on the entire surface of the airbag portion 11 and the length of the tether 2 is substantially the same on the entire surface of the airbag portion 11, the entire surface becomes more uniform in width and thickness when deployed. The airbag portion 11 can be obtained. Further, if necessary, the airbag portion 11 can be made to have a thickness changed in the surface direction depending on the position where the tether 2 is provided, the length of the tether 2, and the like.

  Further, the tether 2 may be provided by a single thread that is spanned at a predetermined interval in the weft direction and the warp direction, or may be provided in a belt shape by continuously spanning a plurality of threads. When the tether 2 made of one yarn is provided every predetermined number, a large number of tethers 2 can be provided at predetermined positions apart from each other, and the gas flow is not hindered by the tether 2. On the other hand, when the tether 2 is provided in a belt shape, the number of yarns continuously stretched is not particularly limited, but when viewed as the width of the belt portion, the belt width can be 5 to 20 mm. Further, the tether 2 may be provided in a direction substantially orthogonal to the weaving direction of the weft and the warp, or may be provided in an oblique direction. However, the tether 2 is not necessarily provided in the oblique direction, and is substantially orthogonal to the weaving direction of the weft and the warp. By providing in the direction to perform, it functions sufficiently as the tether 2.

[2] Non-Airbag Part The non-airbag part 12 (see the non-airbag part 12 in FIGS. 1 and 2) connected to the airbag part 11 in the longitudinal direction of the belt body 1 is It can be woven continuously, and can be formed by bag weaving in the same manner as the airbag portion 11. As described above, it is preferable to continuously weave the airbag portion 11 and the non-airbag portion 12 continuously because the belt body 1 can be manufactured extremely efficiently. The woven structure of the non-airbag portion 12 is closed at the side end portion so that the woven fabric on the one surface side is separated from the woven fabric on the other surface side at both ends in the width direction and the side end portion is not opened. There is no particular limitation except that the portion is formed, and it can be the same as the woven structure of the airbag portion 11 described above.

  Similarly to the airbag portion 11, the non-airbag portion 12 is formed such that both ends in the width direction that are formed wide are woven inward to form a belt body 1 having a predetermined width. Alternatively, the belt body 1 may be woven so as to have a predetermined width from the beginning. In any case, it is necessary to form closed portions at both end portions in the width direction of the non-airbag portion 12 so that the side end portions are not opened.

[3] Material of yarn, fineness, etc. For production of the vehicle seat belt of the present invention, a filament made of a synthetic resin is usually used. The filament includes a multifilament and a monofilament, and a multifilament is often used. The material of the filament is not particularly limited, and filaments made of various synthetic resins can be used.

  The synthetic resin is not particularly limited. For example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide resins such as nylon 6 and nylon 66, polyacrylic resins, and high-density polyethylene and polypropylene. And polyolefin resins. As the synthetic resin, polyester resins and polyamide resins are particularly preferable. Further, the belt body 1 needs to have a predetermined tensile strength in the length direction, and both the airbag portion 11 and the non-airbag portion 12 are made of polyester resin having excellent tensile strength, particularly as warps. It is more preferred to use

  The fineness of the synthetic resin filament such as a multifilament is not particularly limited, and it is preferable to use a multifilament having an appropriate fineness. If the warp and the weft are finenesses within a preferable range, the warp and the weft have sufficient tensile strength as a seat belt, and air leakage from the closed portion is sufficiently suppressed during operation as an airbag. In the case of a multifilament, the number of filaments constituting the multifilament is not particularly limited, and can be set according to the fineness thereof.

  In the vehicle seat belt according to the present invention, the airbag portion 11 provided in the belt body 1 is deployed at the time of a collision and the like, widens and increases in thickness, and the shock from the shoulder, particularly from the shoulder to the chest, is absorbed and mitigated. Thus, it functions as an airbag, but normally functions as a seat belt. Therefore, it is necessary to have the required strength as a seat belt, and as described above, the material of the warp is preferably a synthetic resin having an excellent tensile strength, more preferably a polyester resin. preferable.

[4] Impregnation with resin, etc. At least a part of the woven fabric woven by bag weaving that functions as an airbag by developing at the time of gas flow is made of resin and / or rubber on the outer surface side, etc. It is preferable to impregnate and improve airtightness and the like. Thereby, it can be set as the airbag part 11 by which ventilation | gas_flowing is suppressed and sufficient expansion | deployment speed is ensured. Examples of the resin and rubber used include polyamide-based, polyester-based, polyacryl-based, polyolefin-based, fluorine-based, chlorosulfonated polyethylene-based, chloroprene-based, silicone-based, urethane-based resins, and rubbers.

  The method of impregnating the resin and / or rubber is not particularly limited. For example, at least a portion of the fabric constituting the airbag portion 11 is impregnated with an emulsion containing the resin and / or rubber, and the medium is removed by heating. A method is mentioned. In this case, the air permeability of the airbag unit 11 can be adjusted by the amount of resin and / or rubber attached, and the heat resistance can be improved depending on the type of resin and rubber. This resin and / or rubber impregnation is preferably carried out as necessary in consideration of the difference in air permeability between the woven structure and the woven structure, but is usually carried out.

  It should be noted that the above description is for illustrative purposes only and is not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than restrictive. As detailed herein, modifications may be made in the embodiments within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials, and embodiments have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention can be used in the technical field of seat belts for vehicles and the technical field of airbags. Especially in the length direction of the belt, the part that will be located from the shoulder to the chest when worn is equipped with an airbag part that functions as an airbag in the event of a collision, etc., together with other airbags, more fully occupants It can utilize suitably in the technical field of the seatbelt airbag which can be protected.

  DESCRIPTION OF SYMBOLS 10; Vehicle seat, 10a; Seat cushion, 10b; Seat back, 1; Belt main body, 11; Airbag part, 11a; Both ends of airbag part, 11b: End part of airbag part, 11c; 12; non-airbag part; 2; tether; 3; inflator.

Claims (3)

In vehicle seat belts,
The vehicle seat belt includes a belt body,
The belt body includes an airbag portion having a woven fabric on one side and a woven fabric on the other side woven by bag weaving,
The airbag portion includes a tether that is formed by weaving both ends in the width direction formed in a wide direction inwardly and restricting the expansion in the thickness direction. Seat belt.   The tether is formed by at least one of a weft and a warp spanned from one woven fabric to the other woven fabric of the one side woven fabric and the other side woven fabric during the weaving. Item 2. The vehicle seat belt according to Item 1.   The tether is formed by a weft spanned between an end in the width direction of one of the woven fabric on the one surface side and the woven fabric on the other surface side and a central portion in the width direction of the other woven fabric. The vehicle seat belt according to claim 2.

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