JP4897714B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag device that protects an occupant by deploying an airbag in the event of a vehicle collision. For example, the present invention relates to an airbag device that protects an occupant by inflating and deploying an airbag in a predetermined direction by a gas generator (inflator) installed inside the airbag.

  Currently, a seat belt device for safely holding (restraining) a vehicle occupant or the like in a seat is in widespread use. Further, as a buffer system that supports the seat belt device, an airbag device that protects an occupant with a balloon-like airbag at the time of a collision has been put into practical use.

  As the airbag device, those having various configurations are known. For example, there are an airbag device for a driver seat and a passenger seat stored in a steering wheel or an instrument panel. In such an airbag apparatus, a folded airbag and an inflator (gas generator) are housed in an airbag module, and the inflator is ignited by an electrical signal from a sensor that detects a vehicle collision, and then rapidly The air bag is inflated instantly by the burned gas.

  Also, in recent years, when another car collides with the side of the car, or when the side of the spun car collides with a guide rail, a power pole, etc., between the occupant's body and the door. A side collision airbag (side airbag) device that inflates the airbag and prevents the passenger's body and the inner surface of the door or the like from directly colliding with each other has been put into practical use.

As a side airbag device, what was indicated by patent documents 1, patent documents 2, etc. is proposed.
JP-A-2005-104176 JP 2004-291887 A

  In FIG. 1, an example of the airbag structure used for the conventional side airbag apparatus is shown. FIG. 2 is a cross-sectional view in the AA direction of FIG. A conventional airbag apparatus 10 shown in FIG. 1 includes an airbag that is inflated and deployed to protect an occupant when an accident such as a collision occurs, and an inflator 16 that is accommodated inside the airbag and generates inflation gas.

  The airbag includes a base cloth 12 that forms a bag shape as a whole, and a reinforcing cloth 18 that is disposed between the base cloth 12 and the inflator 16 so as to cover the inflator 16. The base fabric 12 is sewn in a bag shape, and an air vent 14 is formed on the tip side. The air vent 14 is for reducing the impact on the occupant by releasing the internal pressure after the airbag is inflated.

  The inflator 16 is connected to a collision sensor (not shown) by a harness 22. Electric power for ignition is supplied to the inflator 16 through the harness 22. Holes (24, 26) through which the harness 22 passes are formed in a part of the base fabric 12 and the reinforcing fabric 18 constituting the airbag. The holes (24, 26) are overlapped at the same position on the base cloth 12 and the reinforcing cloth 18, and the peripheries thereof are sewn together.

  Two reinforcing cloths 18 are provided inside the base cloth 12, and the inflator 16 is sandwiched from both sides (front side and back side in FIG. 1) inside the bag-like base cloth 12. . The side of the reinforcing cloth 18 on the side of the airbag tip (inflated tip) is provided so that the inflator 16 is open with respect to the inside of the airbag.

  The airbag shown in FIG. 1 is folded in a bellows shape from the left side to the right side of the drawing when accommodated, and is generally deployed toward the left side of the drawing when the device is operated.

  In the conventional airbag apparatus having the structure shown in FIG. 1, there is a possibility that inflation gas generated in the inflator 16 leaks from the hole 24 when the airbag is deployed. Further, there is a problem that the harness 22 is pulled by the behavior of the airbag when not in use, and the squib connector is damaged, for example.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide an airbag device having a structure capable of reducing the amount of inflation gas leaking from an opening through which a harness passes.

  It is another object of the present invention to provide an airbag device that can reduce stress on the harness or the connector portion.

  In order to achieve the above object, the present invention provides an inflator that is accommodated inside an airbag and supplies inflation gas to the airbag in an airbag device that protects an occupant in a vehicle by inflating and deploying the airbag. And a harness connected to the inflator and supplying ignition power to the inflator. And the said airbag is equipped with the base fabric shape | molded by the bag shape; and the reinforcement cloth arrange | positioned between the said base fabric and the said inflator. The reinforcing cloth is provided with a first opening through which the harness passes, and the base cloth is provided with a second opening through which the harness passes through the first opening. Furthermore, when the airbag is deployed, the first opening and the second opening are arranged so as not to overlap each other when viewed from the normal direction of the base fabric.

  The present invention can be applied to various types of airbag apparatuses in which an inflator is disposed inside an airbag, and is particularly effective for a side airbag apparatus that requires a high deployment speed.

  In the airbag device according to the present invention as described above, the second opening provided in the base fabric and the first opening provided in the reinforcing fabric do not overlap when the airbag is deployed. The amount of gas leaking from the gas can be minimized. In addition, since the position (posture) of the harness is regulated between the base fabric and the reinforcing fabric, stress on the harness and the connector portion can be reduced.

  Note that “does not overlap when viewed from the normal direction” means that the first opening provided in the base fabric and the second opening provided in the reinforcing fabric partially overlap when the airbag is deployed. Means not fit.

  Preferably, the first opening provided in the reinforcing cloth is a slit (cut), and the second opening provided in the base cloth is a hole. Here, the “slit” can be an elongated hole cut out in a plane in addition to a single straight cut. In the case of “simple cut”, there is no opening width (gap), so there is an advantage that the posture of the harness can be regulated. On the other hand, in the case of an elongated hole, there is an advantage that it is easy to pass the harness during assembly.

  More preferably, the airbag is folded and accommodated so that the second opening is located on the outermost surface. Thereby, while being able to suppress the twist of a harness, the length of a harness can be shortened.

  Hereinafter, the present invention will be described in detail with reference to examples. FIG. 3 is a perspective view showing a side airbag device according to the present invention mounted and deployed (operated). FIG. 4 is a plan view showing the structure of the side airbag device according to the present invention. FIG. 5 is a cross-sectional view in the BB direction of FIG.

  As shown in FIG. 3, the airbag 100 of the side airbag device according to the present invention is housed inside a vehicle seat 102 and is inflated and deployed from the side of the seat 102 when a situation such as a vehicle collision occurs. It is like that. The present invention can be applied not only to the side airbag device but also to other airbag devices.

  The airbag apparatus 110 of the present invention shown in FIG. 4 includes an airbag (100) that is inflated and deployed to protect an occupant when an accident such as a collision occurs, and an inflator that is accommodated inside the airbag (100) and generates inflation gas. 116. The airbag (100) includes a base fabric 112 that forms an overall shape, and two reinforcing fabrics 118 (118a, 118b) that are disposed between the base fabric 112 and the inflator 116 so as to cover the inflator 116. Composed. The base fabric 112 is sewn in a bag shape, and an air vent 114 is formed on the tip side. The air vent 114 is for reducing the impact on the occupant by releasing the internal pressure after the airbag is inflated.

  Two reinforcing cloths 118 are provided inside the base cloth 112, and the inflator 116 is sandwiched from both sides (the front side and the back side in the figure) inside the bag-like base cloth 112. In the reinforcing cloth 118, the side of the airbag inside (deployment tip) side is not sewn and is open.

  The inflator 116 is connected to a collision sensor (not shown) by a harness 122. Electric power for ignition is supplied to the inflator 116 via the harness 122. Openings (124, 126) through which the harness 122 passes are formed in part of the base fabric 112 and the reinforcing fabric 118 (118a, 118b) that constitute the airbag.

  7 and 8 are development views showing the structure of the airbag of the side airbag device according to the present invention, the state before the reinforcement cloth 118 (118a, 118b) is attached (FIG. 7) and the reinforcement cloth 118 ( 118a and 118b) are shown (FIG. 8).

  A first opening 126 through which the harness 122 passes is provided in one of the two reinforcing cloths 118a and 118b. The base fabric 112 is provided with a second opening 124 through which the harness 122 passing through the first opening 126 passes. As shown in FIGS. 6 and 8, the first opening 126 and the second opening 124 are arranged so as not to overlap each other when viewed from the normal direction of the base fabric 112 when the airbag is deployed.

  Referring to FIG. 6, the first opening 126 formed in the reinforcing cloth 118a has a slit shape, and the width (gap) can be set to 25 mm, for example. On the other hand, the second opening 124 formed in the base fabric 112 may be a circular hole having a diameter of 16 mm, for example. In addition, the distance D between the end of the first opening 126 and the end of the second opening 124 is preferably 0 mm or more. That is, it is preferable that the two openings 126 and 124 do not overlap in the direction in which the harness 122 extends (the vertical direction in the figure).

  In manufacturing the airbag, a base fabric 112 and reinforcing fabrics 118a and 118b as shown in FIG. 7 are prepared. Next, as shown in FIG. 8, the reinforcing cloths 118 a and 118 b are superposed on the base cloth 112, and the harness 122 connected in advance to the inflator 116 is pulled out from the first opening 126 and the second opening 124. Thereafter, the base fabric 112 is folded around the center of the air vent 114 and the edge is sewn to form a bag-like airbag. This is the state shown in FIG.

  Next, the airbag is folded in a bellows shape from the left side to the right side in the state of FIG. 4 and accommodated in the seat. At this time, by allowing the second opening 124 to be positioned on the outermost surface, the twist of the harness 122 can be suppressed and the length of the harness 122 can be designed to be short.

  In the airbag apparatus having the above-described structure, for example, when a collision accident occurs, an electrical signal (ignition power) from a sensor that detects a vehicle collision is transmitted to the inflator 116 via the harness 122. The inflator 116 is ignited by this signal, and rapidly burned gas is supplied to the inside of the airbag to inflate the airbag between the occupant's body and the door. This prevents the passenger's body from colliding directly with the inner surface of the door or the like.

  Here, since the second opening 124 provided in the base cloth 112 and the first opening 126 provided in the reinforcing cloth 118 do not overlap, the amount of gas leaking from that portion can be minimized. . In addition, since the position (posture) of the harness 122 is regulated between the base fabric 112 and the reinforcing fabric 118, it is possible to suppress stress on the harness 122 and the connector portion.

  FIG. 9 is an explanatory view showing a structure of a main part of a side airbag device according to another example of the present invention. Instead of the example (hole shape) shown in FIG. 6, the structure shown in (A) or (B) can be adopted.

  In the case of FIG. 9A, the first opening formed in the reinforcing cloth 118 is not a cutout, but a single straight cut 226. Since there is substantially no gap in the opening, the harness 122 is lightly pressed by the cut of the notch 226, and the posture of the harness 122 is regulated.

  In the case of FIG. 9B, both the second opening formed in the base cloth 112 and the first opening formed in the reinforcing cloth 118 are formed in a slit shape (simply cut). By adopting such a structure, the posture regulation effect of the harness 122 is further improved.

  FIG. 10 is an explanatory view showing a structure of a main part of a side airbag device according to another embodiment of the present invention. In the present embodiment, the first opening formed in the reinforcing cloth 118 is cut out or a single straight cut 426. On the other hand, the second opening 124 formed in the base fabric 112 is, for example, a circular hole having a diameter of 16 mm, as in the above-described embodiment (FIGS. 6 and 9A). The distance D between the end portion of the first opening 426 and the end portion of the second opening 124 is preferably 0 mm or more, and the two openings 426 and 124 preferably do not overlap in the direction perpendicular to the paper surface.

  A major feature of the embodiment shown in FIG. 10 is the arrangement of the first opening 426 and the second opening 124. In this example, the center of the second opening 124 formed in the base cloth 112 is disposed on the extension line of the first opening 426 formed in the reinforcing cloth 118. With such a configuration, the rate at which the harness 122 bends within the plane of the drawing is reduced, and the first opening 426 can be easily passed from the second opening 124 to improve workability. In the figure, the first opening 426 is cut, but a slit having an opening width may be used as in the embodiment of FIG.

  As mentioned above, although the Example of this invention was described, this invention is not limited to these Examples at all, It can change in the category of the technical idea shown by the claim.

FIG. 1 is a plan view showing an example of the structure of a conventional side airbag device. FIG. 2 is a cross-sectional view in the AA direction of FIG. FIG. 3 is a perspective view showing a side airbag device according to the present invention mounted and deployed (operated). FIG. 4 is a plan view showing the structure of the side airbag device according to the present invention. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is an explanatory view showing the structure of the main part of the side airbag device according to the present invention. FIG. 7 is a development view showing the structure of the airbag of the side airbag device according to the present invention, and shows a state before the reinforcing cloth is attached. FIG. 8 is a development view showing the structure of the airbag of the side airbag device according to the present invention, showing a state in which a reinforcing cloth is attached. FIG. 9 is an explanatory view showing a structure of a main part of a side airbag device according to another example of the present invention. FIG. 10 is an explanatory view showing a structure of a main part of a side airbag device according to another embodiment of the present invention.

Explanation of symbols

110 Airbag device 112 Base cloth 116 Inflator 118 Reinforcement cloth 122 Harness 124 Second opening 126 First opening

Claims (6)

In an airbag device that protects an occupant in a vehicle by inflating and deploying an airbag,
An inflator housed in the airbag and supplying inflation gas into the airbag;
A harness that is connected to the inflator and supplies ignition power to the inflator;
The airbag includes a base fabric formed in a bag shape; and a reinforcing fabric disposed between the base fabric and the inflator,
The reinforcing cloth is provided with a first opening through which the harness passes, and the base cloth is provided with a second opening through which the harness passes through the first opening,
When the airbag is deployed, the first opening and the second opening are formed so as to spread in the plane of the reinforcing cloth and the base cloth when viewed from the normal direction of the base cloth. The first opening and the second opening are arranged so as not to overlap each other when viewed from the normal direction , the first opening is covered with the base cloth, and the second opening is the reinforcing member An airbag device characterized by being covered with a cloth . The airbag device according to claim 1, wherein the first opening and the second opening are arranged so as not to overlap in a direction in which the harness extends. The airbag apparatus according to claim 1 or 2 , wherein the first opening is a slit (notch), and the second opening is a hole.   In an airbag device that protects an occupant in a vehicle by inflating and deploying an airbag,
  An inflator housed in the airbag and supplying inflation gas into the airbag;
  A harness that is connected to the inflator and supplies ignition power to the inflator;
  The airbag includes a base fabric formed in a bag shape; and a reinforcing fabric disposed between the base fabric and the inflator,
  The reinforcing cloth is provided with a first opening through which the harness passes, and the base cloth is provided with a second opening through which the harness passes through the first opening,
  At the time of deployment of the airbag, the first opening and the second opening are arranged so as not to overlap when viewed from the normal direction of the base fabric,
  The first opening is a slit (notch), and the second opening is a hole,
  The airbag device, wherein a center of the second opening is located on an extension line of the first opening. The airbag apparatus according to any one of claims 1 to 4 , wherein the airbag apparatus is a side airbag apparatus having a structure in which the airbag is deployed from a side portion of a seat. The airbag device according to any one of claims 1 to 5 , wherein the airbag is folded and accommodated such that the second opening is positioned on an outermost surface.

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