JP2017114242A - Side air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side air bag device that can inflate and deploy an air bag properly irrespective of a body type of an occupant and a collision speed.SOLUTION: When the air bag 20 is inflated and deployed, an inner vent hole 23 is opened in an inner part of an outer bag 21 in a first deployment state, while the inner vent hole 23 is opened on an outer side of the outer bag 21 in a second deployment state.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a side airbag device in which an airbag is deployed on a seat side portion of a vehicle.

  Conventionally, there is a side airbag device as one of the passenger safety devices. The side airbag device includes an airbag that can be inflated and deployed between an occupant and a door trim (side door) by gas ejected from an inflator fixed to a frame of a seatback (or door trim). The side airbag device protects an occupant from an impact caused by a side collision by inflating and deploying the airbag when an impact is applied to the vehicle due to a side collision or the like.

  The gap between the occupant and the side door changes depending on the physique of the occupant, and the pressure when the airbag is inflated and deployed changes accordingly. That is, the pressure when the airbag is inflated varies depending on the physique of the occupant. Therefore, there is a possibility that the protection performance (restraint performance) by the airbag changes depending on the physique of the occupant.

  In order to solve such problems, there has been proposed an airbag device capable of adjusting the deployment thickness of the airbag according to the occupant's physique. Specifically, a main bag and a sub bag are provided as airbags, and when the occupant has a large physique, the main bag is deployed, and when the occupant has a small physique, the main bag and the sub bag By deploying both of these, there is one that stabilizes the protection performance (restraint performance) of the occupant regardless of the physique of the occupant (see, for example, Patent Document 1).

Japanese Patent No. 4952321

  However, when the thickness of the side bag in the vehicle width direction is changed according to the occupant's physique as in the invention described in Patent Document 1, the protection performance of the occupant may not be sufficiently exhibited depending on the collision speed. Specifically, when the collision speed is high, the gap between the occupant and the side door is instantly narrowed even if the occupant's physique is small. Therefore, in such a situation, if the airbag is deployed according to the small occupant's physique, the pressure in the airbag may increase.

  The present invention has been made in view of such circumstances, and provides a side airbag device capable of inflating and deploying an airbag with a more appropriate internal pressure irrespective of the occupant's physique and collision speed. Objective.

  A first aspect of the present invention that solves the above problem is a side airbag device that inflates and deploys an airbag with an inflator between a side member of a vehicle and an occupant seated on a seat, and the airbag includes the airbag An outer bag that forms an outer peripheral surface of the airbag, and an inner bag that is disposed inside the outer bag and that is supplied with gas from the inflator, and the inner bag discharges the gas supplied from the inflator When the airbag is inflated and deployed, the inner vent hole is opened in the outer bag in the first deployed state, and in the vehicle width direction as compared with the first deployed state. The side airbag is configured such that the inner vent hole is opened to the outside of the outer bag in the second deployed state where the airbag is deployed in a narrow width. Apparatus is in.

  According to a second aspect of the present invention, in the side airbag device according to the first aspect, the inner bag includes a main body portion that is deployed in the outer bag, and the main body portion in a state in which the airbag is deployed. The outer bag has an insertion hole through which a tip end portion of the columnar projection is slidably inserted, and the inner vent hole is the columnar shape. The inner bag has the inner vent hole located inside the insertion hole in the first deployed state, and the inner bag has the inner vent hole in the insertion hole in the second deployed state. The side airbag device is configured to be located outside.

  According to a third aspect of the present invention, in the side airbag device according to the second aspect, gas is supplied to the inner bag from the rear side of the vehicle by the inflator, and the columnar protrusion is formed from the main body. The side airbag device is provided so as to protrude toward the front side of the vehicle.

  According to a fourth aspect of the present invention, in the side airbag device according to the second or third aspect, a base fabric forming the inner bag is folded at a boundary portion between the columnar protrusion and the main body. The side airbag device is characterized in that an inflation regulating portion is provided that regulates the inflation of the columnar protrusion in the first deployed state by being held.

  According to such a side airbag device of the present invention, the airbag can be inflated and deployed at a more appropriate internal pressure regardless of the physique and collision speed of the occupant, and the protection performance (restraint performance) of the occupant can be further stabilized. Can do.

It is a figure which shows schematic structure of the side airbag apparatus which concerns on this invention. It is a figure which shows schematic structure of the side airbag apparatus which concerns on this invention. It is a figure which shows typically schematic structure of the airbag which concerns on one Embodiment of this invention. It is a figure which shows typically schematic structure of the airbag which concerns on one Embodiment of this invention. It is a figure which shows an example of the holding structure of the columnar protrusion part which concerns on one Embodiment of this invention. It is a figure which shows the modification of the expansion control part which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 are schematic views showing a schematic configuration of the airbag apparatus according to the present embodiment, both of which show a state where the airbag is inflated and deployed.

  As shown in FIG.1 and FIG.2, the side airbag apparatus 10 is each provided in the sheet | seat 1 on which the passenger | crew C sits. In the present embodiment, the side airbag device 10 is provided on a side portion of the seat back 2 (a side portion on the side door 3 that is an example of a side member of the vehicle). The side airbag device 10 includes a bag-like airbag 20 formed of a base fabric, and an inflator (gas introduction means) 40 for supplying gas from the vehicle rear side into the airbag 20. Yes.

  At normal time, the airbag 20 is folded and stored in the side part of the seat back 2, for example. When a vehicle collision (for example, a side collision) is detected, the side airbag device 10 is activated, and gas is ejected from the inflator 40, so that the occupant C seated on the seat 1 and the vehicle side It is inflated and deployed between the door 3. The airbag 20 inflated and deployed in this manner reduces the impact input to the occupant C when the vehicle collides. Therefore, the occupant C can be appropriately protected at the time of a vehicle collision.

  FIG. 3 is a diagram schematically illustrating the internal structure of the deployed airbag, and FIG. 3A is a diagram illustrating the internal structure of the airbag in the first deployed state in the vehicle front-rear direction. FIG. 3B is a view showing the internal structure of the airbag in the cross section taken along the line AA ′ of FIG. 3A, and FIG. 3C is a cross section taken along the line BB ′ of FIG. It is a figure which shows the internal structure of the airbag in FIG. FIG. 4 is a diagram schematically showing the internal structure of the airbag in the second deployed state.

  As shown in FIGS. 3 and 4, the airbag 20 includes an outer bag 21 that forms the outer peripheral surface of the airbag 20, and an inner bag 22 that is disposed inside the outer bag 21. The inflator 40 supplies gas into the inner bag 22 at the time of a vehicle collision or the like, and is disposed in the inner bag 22 in this embodiment. Of course, the inflator 40 may be disposed outside the airbag 20 and connected to the airbag 20 so that gas can be supplied into the inner bag 22.

  The inner bag 22 is formed with an inner vent hole 23 for discharging the gas supplied from the inflator 40 and adjusting the inner pressure. When the airbag 20 is inflated and deployed, the inner bag 22 is located in the outer bag 21 in the first deployed state where the width of the airbag 20 in the vehicle width direction is relatively wide. It is comprised so that it may open. Further, the inner bag 22 is configured such that the inner vent hole 23 opens to the outside of the outer bag 21 in the second deployed state where the width of the airbag 20 in the vehicle width direction is narrower than that in the first deployed state. Has been.

  The first deployed state is, for example, a deployed state of the airbag 20 when the amount of deformation of the side door 3 due to a side collision is relatively small and the gap between the occupant C and the side door 3 is relatively wide. The second deployed state is, for example, a deployed state of the airbag 20 when the deformation amount of the side door 3 due to a side collision is relatively large and the gap between the occupant C and the side door 3 is relatively narrow.

  The inner bag 22 according to the present embodiment includes a main body portion 24 that is deployed in the outer bag 21 and a columnar protrusion portion 25 that protrudes in a columnar shape from the main body portion 24. The main body 24 is disposed on the vehicle rear side inflator 40 side of the outer bag 21, and the gas supplied from the inflator 40 is used regardless of whether the main bag 24 is in the first deployed state or the second deployed state. It is deployed only in the outer bag 21.

  The columnar projecting portion 25 is provided so as to project in a columnar shape from the main body portion 24 in a state where the airbag 20 is inflated and deployed, and in this embodiment, projecting in a columnar shape toward the vehicle front side. The inner vent hole 23 described above is provided in the vicinity of the tip of the columnar protrusion 25. Further, the base end portion of the columnar protruding portion 25, that is, the boundary portion between the columnar protruding portion 25 and the main body portion 24 is temporarily fixed in a state where the base fabric constituting the inner bag 22 is folded, and the expansion of the columnar protruding portion 25 is performed. An expansion regulating portion 26 that regulates the pressure is formed. In this embodiment, the expansion restricting portion 26 is temporarily fixed by sewing the folded base fabric with a thread. As will be described in detail later, the columnar protrusion 25 is deployed only in the outer bag 21 in the first deployed state, and is deployed to the outside of the outer bag 21 in the second deployed state.

  On the other hand, the outer bag 21 is provided with an outer vent hole 27 that discharges the gas supplied into the outer bag 21 and adjusts the internal pressure, and is opposed to the tip of the columnar protrusion 25 of the inner bag 22. In addition, a sub vent hole 28 as an insertion hole is provided. In the sub vent hole 28, the tip end portion of the columnar protrusion 25 of the inner bag 22 is held in a slidably inserted state.

  The method of holding the state where the columnar protrusion 25 is inserted into the sub vent hole 28 is not particularly limited. For example, as shown in FIG. 5, a belt member having a predetermined length is provided at the tip of the columnar protrusion 25. 29 and a guide member 30 connected to the belt member 29 may be provided on the inner surface of the outer bag 21. Both ends of the belt member 29 are fixed to the columnar protrusions 25, and the guide member 30 is inserted into a space between the columnar protrusions 25 and the belt member 29, and both ends thereof are fixed to the inner surface of the outer bag 21. ing. With such a configuration, the columnar protrusion 25 can be prevented from coming off from the sub vent hole 28, and the columnar protrusion 25 can slide within the length of the belt member 29.

  In the first deployed state in which the deployment width W1 of the main body 24 (inner bag 22) in the vehicle width direction is relatively wide, the columnar protrusion 25 is substantially inflated and deployed in the outer bag 21 (see FIG. 3). ). In the first deployed state, the main body portion 24 has a relatively large amount of expansion in the vehicle width direction and a relatively small amount of expansion in the vehicle front-rear direction. Further, in the first deployed state, since the internal pressure of the main body 24 is low, the expansion restricting portion 26 is not opened, and the length (projection amount) of the columnar protrusion 25 from the main body 24 can be kept short.

  Therefore, the inner vent hole 23 opens inside the sub vent hole 28, that is, in the outer bag 21. Therefore, in the first deployed state, the gas discharged from the inner vent hole 23 is supplied into the outer bag 21, and the outer bag 21 is greatly expanded and deployed in the vehicle width direction. As a result, the amount of expansion of the inner bag 22 in the vehicle width direction is further increased. Thereby, for example, even when the amount of deformation of the side door 3 due to the side collision is relatively small and the gap between the occupant C and the side door 3 is relatively wide, the internal pressure of the airbag 20 is set to an appropriate pressure. And the passenger C can be properly protected. The gas supplied to the outer bag 21 is discharged to the outside from the outer vent hole 27, and the inside of the outer bag 21 is adjusted to an appropriate pressure.

  On the other hand, in the second deployed state where the deployment width W2 of the main body 24 (inner bag 22) in the vehicle width direction is relatively narrow, the columnar protrusion 25 is inflated and deployed to the outside of the outer bag 21 (see FIG. 4). In the second deployed state, the main body portion 24 has a relatively small amount of expansion in the vehicle width direction, and accordingly, the amount of expansion in the vehicle front-rear direction is relatively large. Further, in the second deployed state, the expansion regulating portion 26 is opened by increasing the internal pressure of the main body 24, and the length (projection amount) of the columnar protrusion 25 from the main body 24 becomes relatively long. That is, the yarn that temporarily fixes the folded base fabric breaks and the base fabric spreads, so that the protruding amount of the columnar protrusion 25 is longer than that in the first deployed state.

  For this reason, the columnar protrusion 25 is inflated and deployed to the outside of the outer bag 21 by sliding along the sub vent hole 28. The inner vent hole 23 opens outside the sub vent hole 28, that is, outside the outer bag 21. Therefore, in the second deployed state, the gas in the inner bag 22 is discharged outside the airbag 20 without being supplied into the outer bag 21. Specifically, while the inner bag 22 is inflated and deployed to the second deployed state, that is, while the inner vent hole 23 is opened in the outer bag 21, the gas in the inner bag 22 is removed from the inner vent hole 23. The outer bag 21 is inflated and deployed by being supplied into the bag 21, but no gas is supplied to the outer bag 21 when the second deployed state is reached.

  Therefore, the deployment amount of the outer bag 21 (particularly, the deployment amount in the vehicle width direction) can be kept small. As a result, the amount of expansion of the inner bag 22 in the vehicle width direction is also reduced. Accordingly, for example, even when the deformation amount of the side door 3 due to the side collision is relatively large and the gap between the occupant C and the side door 3 is relatively narrow, the internal pressure of the airbag 20 is set to an appropriate pressure. And the occupant C can be protected more appropriately.

  As described above, in the present invention, when the airbag 20 is inflated and deployed, the inner vent hole 23 opens inside the outer bag 21 in the first deployed state, and the inner vent hole 23 in the second deployed state. Opened to the outside of the outer bag 21. As a result, for example, when an impact is applied to the vehicle due to a side collision or the like, the occupant C is more appropriate regardless of the size of the occupant C and the collision speed, that is, regardless of the size of the gap between the occupant C and the side door 3. Can be protected.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the base cloth that forms the inner bag 22 is held in a folded state at the base end portion of the columnar protrusion 25, and the expansion restricting portion 26 that restricts the expansion of the columnar protrusion 25 is provided. I made it. However, the expansion restricting portion 26 is not particularly limited as long as it can restrict the expansion of the columnar protrusion 25 in the first deployed state.

  For example, as illustrated in FIG. 6, the expansion regulating unit 26 may be configured by a first tether 31 and a second tether 32 that are string-like members. The first tether 31 is connected to the mutually facing inner surfaces 24 a and 24 b of the main body portion 24 of the inner bag 22. Further, the first tether 31 is provided with a predetermined length so as to be along the vehicle width direction in a state where the airbag 20 is deployed. The second tether 32 is wound around the first tether 31, and both ends thereof are connected to the vicinity of the base end portion of the columnar protrusion 25.

  In such a configuration, when the airbag 20 is in the first deployed state (FIG. 6A), that is, when the main body 24 is deployed relatively large in the vehicle width direction, the first tether 31 extends. Will be in a state of tension. For this reason, the movement of the second tether 32 toward the vehicle front side is restricted. Therefore, expansion of the vicinity of the base end portion of the columnar protrusion 25 to which both end portions of the second tether 32 are connected is restricted.

  On the other hand, when the airbag 20 is in the second deployed state (FIG. 6B), the first tether 31 is in a loose state (a state where no tension is applied), and the second tether 32 is in front of the vehicle. Movement to the side is allowed. Therefore, the expansion | swelling of the base end part vicinity of the columnar protrusion part 25 to which the both ends of the 2nd tether 32 were connected is accept | permitted.

  Even if the expansion regulating portion 26 has such a configuration, the internal pressure of the airbag 20 is appropriately adjusted by appropriately controlling the amount of expansion of the columnar protrusion 25 in the first deployed state and the second deployed state. Can do.

  Further, in the above-described embodiment, the configuration in which the columnar protrusion 25 protrudes from the main body 24 to the front side of the vehicle is illustrated, but the direction in which the columnar protrusion 25 protrudes is not particularly limited, and may be, for example, upward or downward You may make it project.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Side door 10 Side airbag apparatus 20 Air bag 21 Outer bag 22 Inner bag 23 Inner vent hole 24 Main body part 25 Columnar protrusion 26 Expansion restriction part 27 Outer vent hole 28 Sub vent hole 29 Belt member 30 Guide Member 31 First tether 32 Second tether 40 Inflator

Claims (4)

A side airbag device in which an airbag is inflated and deployed by an inflator between a side member of a vehicle and an occupant seated on a seat,
The airbag has an outer bag that forms an outer peripheral surface of the airbag, and an inner bag that is disposed inside the outer bag and is supplied with gas from the inflator,
The inner bag is
An inner vent hole for discharging the gas supplied from the inflator;
When the airbag is inflated and deployed, the inner vent hole opens inside the outer bag in the first deployed state, and the deployment width of the airbag in the vehicle width direction is narrower than in the first deployed state. In the second deployed state, the inner vent hole is configured to open to the outside of the outer bag. In the side airbag device according to claim 1,
The inner bag includes a main body portion that is deployed in the outer bag, and a columnar protrusion that projects in a columnar shape from the main body portion toward the outside in a state where the airbag is deployed. Has an insertion hole through which the tip of the columnar protrusion is slidably inserted,
The inner vent hole is provided in the columnar protrusion,
The inner bag is configured such that the inner vent hole is positioned inside the insertion hole in the first deployed state, and the inner vent hole is positioned outside the insertion hole in the second deployed state. A side airbag device characterized by comprising: In the side airbag device according to claim 2,
Gas is supplied to the inner bag from the rear side of the vehicle by the inflator, and the columnar protruding portion is provided to protrude from the main body portion toward the front side of the vehicle. Airbag device. In the side airbag device according to claim 2 or 3,
Expansion that regulates expansion of the columnar protrusion in the first deployed state by holding the base fabric that forms the inner bag in a folded state at the boundary between the columnar protrusion and the main body. A side airbag device characterized in that a regulating portion is provided.

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