JP2012166685A - Vehicle airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To capture a nearby occupant by opening a vent hole in the small capacity expansion at an initial stage of the inflation and deployment of the airbag, and to capture the separately-placed occupant by allowing the vent hole to open in this state in the process of the full inflation and deployment in which the vent hole is blocked to enable a quick full inflation and deployment.SOLUTION: At the initial stage of inflation and deployment, a first surface forming base fabric 11 and a second surface forming base fabric 12 are joined at a joint part 13 in which each can be separated from each other at the outer peripheral side under a predetermined inflation gas pressure, and the vent hole 5 at the second surface forming base fabric 12 side is opened without being blocked by a vent hole cover 6 having a hauling part 6b. In the initial stage of inflation and deployment, the airbag 1 undergoes inflation, so that the joint part 13 is separated to form in a large capacity expansion shape. In the process of progress, the vent hole 5 is blocked by a pulling action due to elongation of the vent hole cover 6 to be in a full inflation and deployment state early, and the vent hole 5 is opened by relaxing the vent hole cover 6 when the occupant 10 is brought into contact with the airbag.

Description

  In the present invention, when an impact such as a collision is applied to a vehicle, an airbag that is inflated and deployed by an inflating gas ejected from an inflator to protect an occupant has a first surface configuration base fabric and an opposite occupant side And a vent hole provided on the second surface configuration base fabric side of the airbag is inflated by opening and closing according to the inflation and deployment of the airbag. The present invention relates to a vehicle airbag configured to be capable of adjusting a gas pressure.

  This type of conventional vehicle airbag detects a shock such as a vehicle collision and inflates and expands with an inflation gas ejected from an inflator. In consideration of whether the air bag is close to or away from the air bag, an air bag inflated shape or an inflated gas pressure (internal pressure) inside the air bag can be appropriately selected. One is a so-called pressure-accumulation airbag, and the other is a variable capacity airbag.

  Both the pressure accumulation type airbag and the variable capacity type airbag are provided with a vent hole in the base fabric constituting the airbag, and the internal inflation gas pressure is adjusted by opening and closing the vent hole as appropriate. Yes.

  Of the two types of airbags, the pressure-accumulation airbag opens the vent hole in the initial stage of inflation and deployment to allow the release of inflation gas, and the impact of the occupant seated close to the airbag In addition, if the occupant is seated separately from the airbag, it is further inflated and deployed from the initial stage of inflation and deployment, and the vent hole is closed or opened in the process. By suppressing the release of inflation gas and achieving early inflation and deployment, it is intended to reliably capture and protect occupants that are separated (see Patent Document 1).

  In addition, the variable capacity airbag has a vent hole formed in a pair of base fabrics constituting the airbag, and the vent hole is formed in the process of deploying the airbag with a gas (inflation gas) generated by an inflator at the time of a vehicle collision. In order to be configured to open, a pair of overlapped base fabrics are joined at a separable joint, and the joint is separable by a load when the airbag is deployed, and the vent hole is closed. The end of the vent hole cover is joined at the joint near the outer periphery of the airbag, and the vent hole is opened by separating the end of the vent hole cover from the base cloth by separating the joint. ing.

  In such a variable capacity airbag, since the joint portion is in an unseparated state at the initial stage of inflation and deployment, the vent hole is closed by the vent hole cover to form a small-capacity deployment shape, so For the occupants who are separated and separated, the joints are separated so that a large-capacity full inflated deployment shape is achieved, and the vent hole is blocked by the vent hole cover so that the inside of the airbag is appropriately inflated. It is intended to gently protect the gas by releasing it to the outside (see Patent Document 2).

JP 2005-14862 A JP 2010-173620 A

  By the way, this type of vehicle airbag is inflated and deployed at an early stage in order to capture and protect the occupant seated in close proximity, and to appropriately release internal inflation gas. It is necessary to inflate and deploy to a large capacity fully inflated and deployed shape for an occupant seated apart, and to release the inflated gas as appropriate. It is important to take it more gently.

  From this point of view, when the above-described two-type vehicle airbags are examined, when both airbags are inflated and deployed and are fully inflated and deployed, the vent holes can be opened and internal inflation gas can be appropriately discharged to the outside. Therefore, it can be said that the separated occupant can be gently captured and protected.

  However, since the former pressure-accumulation airbag has a vent hole opened in the initial stage of inflation and deployment, the passenger can be gently captured and protected, but the airbag is inflated and deployed with a large capacity. Therefore, it can be said that the problem remains in terms of early expansion and deployment. Further, in the latter variable type airbag, when the airbag is inflated and deployed to a small capacity with the joint portion in the initial stage of inflation and deployment being separated, the vent hole is closed, so that the adjacent occupant It can be said that there remains a problem in terms of gently capturing and protecting the image.

  Therefore, in view of the problems in the prior art, the present invention inflates and deploys to a small capacity at the initial stage of inflation and deployment of the airbag, opens a vent hole, gently captures and protects an adjacent passenger, In the process of further expanding from the initial stage of expansion and expansion to the full expansion and expansion, the vent hole that has been opened is closed or small opening, and the full expansion and expansion is performed at an early stage. It is an object of the present invention to provide a vehicle airbag that can reliably and gently capture and protect a passenger.

  In the vehicle airbag according to the present invention, the airbag that is inflated and deployed by the inflation gas ejected from the inflator to protect the occupant has the first surface configuration base fabric that faces the occupant side and the second surface that faces the occupant side. And a configuration that allows adjustment of the inflation gas pressure by opening and closing a vent hole provided on the second surface construction base fabric side of the airbag according to the inflation and deployment of the airbag. An air bag for a vehicle, wherein one end portion of a vent hole cover that opens and closes the vent hole is fastened to a first surface configuration base fabric, and a hand feeding portion is formed on the other end side of the vent hole cover. A vent hole is opened, the other end is joined to the first surface configuration base fabric or the second surface configuration base fabric on the outer peripheral side of the vent hole, and the feeding portion, the first surface configuration base fabric, and the second surface configuration Bentho together with the base fabric The outer peripheral portion is joined at a joining portion that can be separated by a predetermined inflation gas pressure to form a small-capacity small bag portion, and the joining portion where the vent hole cover can be separated is released from the hand feeding portion. A guide piece that guides the pulling action when pulled is provided on the inner peripheral side of the vent hole, and the pulling action of the vent hole cover releases the pulling part to close or open the vent hole. The vent hole cover is relaxed to open the vent hole when the airbag in the fully inflated and deployed state is pressed by the occupant's abutment when the vent hole is closed or in a small opening state. It is a feature.

  In the present invention configured as described above, in the initial stage of expansion and deployment, the first surface configuration base fabric and the second surface configuration base fabric are joined to each other at a joint portion that can be separated by a predetermined inflation gas pressure on the outer peripheral portion side. In addition, since the vent hole provided on the second surface configuration base fabric side is configured to open without being closed by the vent hole cover in a state where the hand-drawing portion is joined by the joint portion, a small capacity As a small bag portion, the inflated gas can be inflated and deployed at an early stage, and the inflated gas can be appropriately discharged from the vent hole to the outside, so that an adjacent passenger can be surely and gently captured and protected.

  Further, in the present invention configured as described above, in the state where the inflation and deployment of the airbag has progressed from the initial stage of the inflation and deployment, when the predetermined inflation gas pressure is reached, the joint portion is separated to open the hand feeding portion, The airbag is fully deployed, and the vent hole is closed or made small by opening the vent hole cover in the process of progress. In addition, when the airbag is pressed by the capture and protection of the occupant, the vent hole cover is relaxed to open the vent hole, and is released by releasing the inflation gas in the airbag to the outside. Crew can be gently protected.

1 is a partially broken schematic perspective view drawn with an inflator, an airbag cover, and a back plate in an exploded state in an inflated and deployed state of an airbag according to Embodiment 1 of the present invention. FIG. It is the top view drawn in the state which fractured | ruptured the airbag shown in FIG. It is AA sectional drawing of FIG. It is a disassembled perspective view of the airbag shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which drawn the expansion | deployment deployment state of the airbag which concerns on Example 1 of this invention, among these, (a) is the initial stage expansion | deployment deployment state of the airbag when a passenger | crew is approaching, (b) is a passenger | crew's. (C) is a fully deployed state where the airbag has been inflated and deployed from the state of (a) when separated, and (c) is a fully deployed state of the airbag shown in FIG. Fig. 5 shows a state where a part of the inflation gas is released to the outside to capture and protect the occupant. It is the fragmentary perspective view which expanded and drawn the state in which the vent hole in FIG.5 (c) is opening. It is the fragmentary perspective view which expanded and drawn the principal part of the airbag which concerns on Example 2 of this invention.

  The vehicle airbag according to the present invention is inflated and deployed to a small capacity at the initial stage of inflation and deployment of the airbag and opens a vent hole so as to gently capture and protect a nearby occupant. In the process of progressing and fully inflating and deploying, the vent hole that has been opened is closed or small-opened and fully inflated and deployed at an early stage. It is configured to gently capture and protect.

  Next, the Example which concerns on the airbag for vehicles of this invention is described using figures.

  First, the structure of Example 1 as a vehicle airbag according to the present invention will be described with reference to FIGS.

  The airbag 1 according to the first embodiment of the present invention captures and protects the occupant 10 (see FIG. 5) by inflating and deploying with the inflation gas ejected from the inflator 2 when an impact such as a collision is applied to the vehicle. For this purpose, for example, the first surface constituting base fabric 11 facing the occupant 10 side and the second surface constituting base fabric 12 facing the occupant side are bonded to each other at the outer peripheral portion, for example, by main sewing. It is comprised by joining by the sewing by and forming in a bag shape. When the vehicle is in a normal state, the vehicle is folded into an appropriate shape and is accommodated in the accommodation chamber formed by the airbag case 3 and the back plate 4, for example, on the vehicle body side such as a steering wheel (not shown). is set up.

  The second surface configuration base fabric 12 uses a plurality of inflator mounting holes 12b formed so that the inflator 2 inserted into the inflator insertion hole 12a formed in the substantially central portion surrounds the inflator insertion hole 12a. It is attached with bolts (not shown).

  Further, a vent hole 5 is formed in the second surface configuration base fabric 12 on the outer peripheral side from the inflator insertion hole 12a. The vent hole 5 is configured to be opened and closed by a vent hole cover 6.

  The vent hole cover 6 includes a cover body 6-1 that closes the vent hole 5 and cover leg pieces 6-2 and 6-3 that are bifurcated from the cover body 6-1. Yes. The front end portions of the cover leg piece portions 6-2 and 6-3 (one end portion of the vent hole cover 6) are sewn to the second surface constituting base fabric 12 by main sewing. The front end portion of the cover body portion 6-1 (the other end portion of the vent hole cover 6) is, for example, folded back twice to form the hand-feeding portion 6b, and then is sewn on the second surface configuration base cloth 12 Are sewn. A portion where the cover body 6-1 and the cover leg pieces 6-2 and 6-3 branch is configured as a communication portion 6a that communicates with the vent hole 5.

  In addition, the first surface constituting base fabric 11 and the second surface constituting base fabric 12 are each formed with a joint 13 that is separable by a predetermined inflation gas pressure on the outer peripheral side from the vent hole 5. For example, as clearly shown in FIG. 2, the joint portion 13 includes a vent hole 5 by sewing a plurality of terminal portions in a spiral shape from the outer peripheral portion of the airbag 1 toward the central portion so as to face each other. A small bag portion 14 is defined on the inner peripheral side.

  Further, the guide hole 7 covers the vent hole cover 6 in a state where the cover body 6-1 and the cover leg pieces 6-2 and 6-3 are straddled. The guide piece 7 exists on the first surface constituting base fabric 12 side with respect to the hand feeding portion 6b, and together with the hand feeding portion 6b, the first surface constituting base fabric 11 and the second surface constituting base fabric are formed by the joint portion 13. 12 (see FIGS. 2 and 33). The guide piece 7 is formed with a communication hole 7a that communicates with the vent hole 5 through the communication portion 6a.

  In the first embodiment according to the present invention configured as described above, when an impact occurs due to a vehicle collision accident or the like, such an impact is detected by an airbag control device (not shown) and a command is sent to the inflator 2. Then, the inflation gas is supplied into the airbag 1 to inflate and deploy the airbag 1.

  When an occupant 10 is relatively close to the airbag 1 when encountering such a vehicle collision accident or the like, as the initial stage of inflating and deploying shown in FIG. The second surface configuration base fabrics 12 are joined to each other on the outer peripheral side by a joining part 13 that can be separated by a predetermined inflation gas pressure. And the vent hole 5 provided in the 2nd surface structure base fabric 12 side is joined to the 1st surface structure base fabric 11 and the 2nd surface structure base fabric 12 by the joint part 13 by the hand feeding part 6b of the vent hole cover 6. FIG. Since it is held, it opens without being closed by communicating with the communicating portion 6a of the vent hole cover 6 and the communicating hole 7a of the guide piece 7. As a result, the airbag 1 is inflated and deployed at an early stage in a small capacity state by the small back portion 14. In such a state, the inflation gas can be discharged to the outside from the vent hole 5 through the communication portion 6a and the communication hole 7a of the guide piece 7 (see the arrow). Even if it comes into contact, the airbag 1 is appropriately contracted, and is reliably and gently captured and protected.

  Further, when an occupant 10 is seated in a state of being relatively separated from the airbag 1 when a vehicle collision accident or the like is encountered, the airbag 1 proceeds from the initial stage of inflation and deployment, and is fully inflated and deployed. Transition to the state. In the progressing process, when the inflation gas pressure of the inflation gas in the airbag 1 rises to a predetermined pressure or higher, the sewing constituting the joining portion 13 is separated. As a result, the airbag 1 Then, it will shift to a fully expanded and expanded state. Then, the segregation of the sewing that constitutes the joining portion 13 releases the dragging portion 6b in the vent hole cover 6, and the vent hole cover 6 is stretched and pulled while being guided by the guide piece 7. By operating, the vent hole 5 is closed together with the communication hole 7a of the guide piece 7 by the cover body 6-1 (the state shown in FIG. 5b). In addition, although block | close of the vent hole 5 by the cover main-body part 6-1 is comprised so that it may be completely obstruct | occluded, you may comprise so that it may be in a small opening state, without being limited to this.

  As a result, the airbag 1 is formed into a large-capacity deployment shape by separating the joint portion 13, and the vent hole 5 is closed or opened by a pulling operation of the vent hole cover 6 in the progressing process. The occupant 10 that is separated in the fully inflated and deployed state at an early stage is captured early and reliably.

  In the fully inflated and deployed state, when the occupant 10 comes into contact with the airbag 1 as shown in FIG. 5C, the airbag 1 is pressed. As a result, the vent hole cover 6 is relaxed while being guided by the guide piece 7 by the movement of the expansion gas, and the vent hole 5 is opened. Therefore, the inflation gas is released to the outside of the airbag 1 as shown by the arrow in FIG. 6, and the airbag 1 follows the shape of the head of the occupant 10 as shown in FIG. 5 (c). The occupant 10 that is recessed and separated is gently protected.

  In the airbag 1 according to Example 1 configured as described above, in the initial stage of inflation and deployment, the first surface configuration base fabric 11 and the second surface configuration base fabric 12 can be separated from each other on the outer peripheral side. The vent hole 5 that is joined and provided on the second surface configuration base fabric 12 side is configured to join the hand feeding portion 6b by the joining portion 13 and open without being closed by the vent hole cover 6. From this, the airbag 1 can be inflated and deployed as a small-capacity small bag portion 14 at an early stage by inflating and deploying the small bag portion 14, and the inflation gas can be appropriately discharged from the vent hole 5 to the outside. The passenger can be captured and protected reliably and gently.

  Further, when the occupant 10 is seated in a relatively separated state with respect to the airbag 1, the airbag 1 can be brought into a fully inflated and deployed state by separating the joint 13 by the inflation gas pressure. However, in the process of proceeding to the fully expanded and expanded state, the vent hole cover 6 extends and performs a pulling operation to close the vent hole 5 (or a small opening). The occupant 10 that is in an inflated and deployed state is quickly and reliably captured, and when the airbag 1 is pressed by the capture protection of the occupant 10, the vent hole cover 6 is relaxed to vent the vent hole 5. Thus, the occupant 10 can be gently protected.

  FIG. 7 shows a second embodiment according to the present invention. According to FIG. 7, the second embodiment changes the shape of the vent hole cover 6 to the bifurcated configuration by the cover leg pieces 6-2 and 6-3 in the first embodiment, and replaces the straight cover body 6-1. It consists only of. From this, the communicating part 6a with the vent hole 5 is configured by a hole shape, and a hand feeding part 6b is provided on one end side of the cover main body part 6-1, and the hand feeding part 6b is expanded to a predetermined extent. The point which is joined to the 1st surface composition base fabric 11 and the 2nd surface composition base fabric 12 by the junction part 13 separable by gas pressure, the point which has extended the guide piece 7 over the vent hole cover 6, etc. This configuration has the same configuration as that of the first embodiment.

  Accordingly, in the airbag 1 according to the second embodiment, as in the first embodiment, in the initial stage of the inflation and deployment, the first surface configuration base fabric 11 and the second surface configuration base fabric 12 are each provided with a predetermined inflation gas on the outer peripheral side. Since the vent hole 5 which is joined at the joint portion 13 separable by pressure and provided on the second surface configuration base fabric 12 side joins the hand-drawing portion 6b by the joint portion 13, the vent hole cover 6 The communication portion 6a and the communication hole 7a of the guide piece 7 are connected to each other so as to be opened without being closed. From this, the airbag 1 can be inflated and deployed early in a small capacity state by inflating and deploying the small bag portion 14 and, at the same time, the inflation gas can be discharged to the outside from the vent hole 5 as appropriate. Moreover, it can be gently captured and protected.

  Further, when the occupant 10 is seated in a relatively separated state with respect to the airbag 1, the airbag 1 is separated into the fully inflated deployed state by separating the joint portion 13 with a predetermined inflation gas pressure. However, in the process of proceeding to the fully inflated and expanded state, the vent hole cover 6 is extended to perform a pulling operation, so that the vent hole 5 is closed or made into a small opening, so that When the airbag 1 is pressed by the capture protection of the occupant 10 at an early stage, the vent hole cover 6 is relaxed and vented. By opening the hole 5 greatly, the separated passenger 10 can be gently protected.

  In the present invention, the airbag is inflated and deployed to a small capacity at the initial stage of inflation and opening, and a vent hole is opened to gently capture and protect a nearby occupant. In the process of making it, the vent hole that was opened is closed or small opening and fully expanded and expanded at an early stage, and after the full expansion and deployment, the vent hole is opened, so that the separated occupant can be reliably and gently captured and protected. It can be said that it is suitable for a vehicle airbag or the like that has a vent hole and is configured to be able to adjust the inflation gas pressure of the airbag by opening and closing according to inflation and deployment.

1 Airbag
11 First side composition base fabric
12 Second side composition base fabric
13 joints
14 Small bag 5 Vent hole 6 Vent hole cover
6a Communication part
6b Pulling part 7 Guide piece 10 Crew

Claims (1)

  An airbag that is inflated and deployed by an inflation gas ejected from an inflator to protect an occupant has a first surface configuration base fabric that faces the occupant side and a second surface configuration base fabric that faces the occupant side. And a vehicular airbag configured to be able to adjust an inflation gas pressure by opening and closing a vent hole provided on the second surface configuration base fabric side of the airbag according to the inflation and deployment of the airbag. , One end of the vent hole cover that opens and closes the vent hole to the first surface configuration base fabric is fastened, and the vent hole is opened by forming a gripping portion on the other end side of the vent hole cover, The other end is joined to the first surface configuration base fabric or the second surface configuration base fabric on the outer peripheral side from the vent hole, and the hand feeding portion, the first surface configuration base fabric, and the second surface configuration base fabric are Both from vent holes Joined at a joining part separable by a predetermined inflation gas pressure on the periphery side to form a small-capacity small bag part, and the separable joining part of the vent hole cover is released from the hand feeding part A guide piece that guides the pulling operation when pulled is provided on the inner peripheral side of the vent hole, and the pulling operation of the vent hole cover releases the pulling portion to close or close the vent hole. When the airbag in the fully inflated and deployed state is pressed by the occupant's contact and capture when the vent hole is closed or in a small opening state, the vent hole cover is relaxed and the vent hole is A vehicular airbag characterized by being configured to open.

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