JP6687884B2 - Side airbag device - Google Patents

Description

  The present invention relates to a side airbag device that deploys an airbag on a side portion of a vehicle seat.

  Conventionally, there is a side airbag device as one of occupant 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 seat back (or a door trim). The side airbag device protects an occupant from a side impact by inflating and deploying the airbag when the vehicle is impacted by a side impact or the like.

  The clearance 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 changes depending on the physique of the occupant. Therefore, the protection performance (restraint performance) of the airbag may change depending on the physique of the occupant.

  In order to solve such a problem, there has been proposed an airbag device capable of adjusting the deployment thickness of the airbag according to the physique of the occupant. Specifically, it is equipped with a main bag and a sub-bag as an airbag. 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 are provided. By deploying both of them, there is one in which the protection performance (restraint performance) of the occupant is stabilized regardless of the physique of the occupant (for example, see Patent Document 1).

Japanese Patent No. 4952321

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

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a side airbag device capable of inflating and deploying an airbag at a more appropriate internal pressure, regardless of the occupant's physique and collision speed. To aim.

A first aspect of the present invention that solves the above-mentioned problems is a side airbag device for inflating and deploying an airbag with an inflator between a side member of a vehicle and an occupant seated on a seat. The air bag includes an outer bag forming an outer peripheral surface of the airbag, and an inner bag disposed inside the outer bag and supplied with gas from the inflator. The inner bag discharges gas supplied from the inflator. An inner vent hole , a main body portion that is deployed in the outer bag, and a columnar protrusion that protrudes outward from the main body portion in a columnar shape in a state where the airbag is deployed, while the outer The bag has an insertion hole into which a tip end of the columnar protrusion is slidably inserted, the inner vent hole is provided in the columnar protrusion, and the inner bag has a first expansion. In the state, the inner vent hole is located inside the insertion hole and opens inside the outer bag, and a second expanded state in which the expanded width of the airbag in the vehicle width direction is narrower than that in the first expanded state. Then, the inner vent hole is located outside the insertion hole so as to open to the outside of the outer bag, and gas is supplied to the inner bag from the rear side of the vehicle by the inflator, In the side airbag device, the columnar protrusion is provided so as to protrude from the main body toward the front side of the vehicle .

A second aspect of the present invention is the side airbag device according to the first aspect , in which a base fabric forming the inner bag is held in a folded state at a boundary portion between the columnar protrusion and the main body. Thus , the side airbag device is characterized in that the expansion regulating portion that regulates the expansion of the columnar protruding portion in the first deployed state is provided .

A third aspect of the present invention is a side airbag device for inflating and deploying an airbag with an inflator between a side member of a vehicle and an occupant seated on a seat, wherein the airbag is 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, wherein the inner bag has an inner vent hole that discharges the gas supplied from the inflator. A main body that is deployed in the outer bag, and a columnar protrusion that protrudes outward in a columnar shape from the main body when the airbag is deployed, while the outer bag has the columnar shape. The protrusion has an insertion hole through which the tip portion of the protrusion is slidably inserted, the inner vent hole is provided in the columnar protrusion, and the inner bag has the inner bag in the first expanded state. A toe hole is located inside the insertion hole and opens inside the outer bag, and the inner vent hole is in a second expanded state in which the expanded width of the airbag in the vehicle width direction is narrower than that in the first expanded state. Is located outside the insertion hole and opens to the outside of the outer bag, and the base cloth forming the inner bag is folded at the boundary between the columnar protrusion and the main body. The side airbag device is characterized in that the side airbag device is provided with an expansion restricting part for restricting expansion of the columnar protruding part in the first expanded state by holding the expansion restricting part .

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

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 the schematic structure of the airbag which concerns on one Embodiment of this invention. It is a figure which shows typically the 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 diagrams showing a schematic configuration of the airbag device according to the present embodiment, and both are diagrams showing a state in which the airbag is inflated and deployed.

  As shown in FIGS. 1 and 2, the side airbag device 10 is provided in each of the seats 1 on which the occupant 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 side, which is an example of a side member of a vehicle). The side airbag device 10 includes a bag-shaped airbag 20 formed of a base cloth, and an inflator (gas introducing means) 40 for supplying gas into the airbag 20 from the vehicle rear side. There is.

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

  FIG. 3 is a diagram schematically showing the internal structure of the deployed airbag, and FIG. 3A is a diagram showing the internal structure of the airbag in the first deployed state in the front-rear direction of the vehicle. 3B is a view showing the internal structure of the airbag taken along the line AA ′ in FIG. 3A, and FIG. 3C is a sectional view taken along the line BB ′ in FIG. FIG. 3 is a diagram showing an 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 forming an outer peripheral surface of the airbag 20 and an inner bag 22 arranged inside the outer bag 21. The inflator 40 supplies gas into the inner bag 22 in the event of a vehicle collision or the like, and is arranged in the inner bag 22 in the present embodiment. Of course, the inflator 40 may be arranged 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 vent hole 23 is located inside the outer bag 21 in the first deployed state in which the width of the airbag 20 in the vehicle width direction is relatively wide. It is configured to open. Further, the inner bag 22 is configured such that the inner vent hole 23 is opened to the outside of the outer bag 21 in the second expanded state in which the width of the airbag 20 in the vehicle width direction is narrower than that in the first expanded state. Has been done.

  The first deployed state is, for example, the deployed state of the airbag 20 when the deformation amount 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. Further, 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 has 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 portion 24 is arranged on the vehicle rear side inflator 40 side of the outer bag 21), and regardless of whether it is in the first deployed state or the second deployed state, the main body portion 24 is provided by the gas supplied from the inflator 40. It is deployed only in the outer bag 21.

  The columnar protruding portion 25 is provided so as to protrude in a columnar shape from the main body portion 24 in the state where the airbag 20 is inflated and deployed, and in the present embodiment, protrudes in a columnar shape toward the vehicle front side. The above-mentioned inner vent hole 23 is provided in the vicinity of the tip of this columnar protrusion 25. In addition, the base fabric forming the inner bag 22 is temporarily fixed to the base end of the columnar protrusion 25, that is, the boundary between the columnar protrusion 25 and the main body 24 in a folded state, and the columnar protrusion 25 expands. The expansion regulation part 26 which regulates is formed. In this embodiment, the expansion restricting portion 26 is temporarily fixed by stitching the folded base cloth with a thread. As will be described later in detail, the columnar protrusion 25 is expanded only in the outer bag 21 in the first expanded state, and is expanded to the outside of the outer bag 21 in the second expanded state.

  On the other hand, the outer bag 21 is provided with an outer vent hole 27 for discharging the gas supplied into the outer bag 21 and adjusting the inner pressure, and at a position facing the tip of the columnar protrusion 25 of the inner bag 22. Further, a sub vent hole 28 as an insertion hole is provided. The tip end of the columnar protrusion 25 of the inner bag 22 is slidably inserted and held in the sub vent hole 28.

  The method of maintaining 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 protrusion 25, and the guide member 30 is inserted into the space between the columnar protrusion 25 and the belt member 29 so that both ends thereof are fixed to the inner surface of the outer bag 21. ing. With this structure, the columnar protrusion 25 can be prevented from coming off the sub vent hole 28, and the columnar protrusion 25 can slide within the length of the belt member 29.

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

  Therefore, the inner vent hole 23 opens inside the sub vent hole 28, that is, inside 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 largely inflated and deployed in the vehicle width direction. As a result, the deployment amount of the inner bag 22 in the vehicle width direction is further increased. Thereby, for example, even when the deformation amount 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. Therefore, the occupant C can be appropriately protected. The gas supplied to the outer bag 21 is discharged to the outside through the outer vent hole 27, and the pressure inside the outer bag 21 is adjusted to an appropriate pressure.

  On the other hand, in the second deployed state in which 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 body portion 24 has a relatively small expansion amount in the vehicle width direction, and accordingly, the expansion amount in the vehicle front-rear direction becomes relatively large. Further, in the second expanded state, the internal pressure of the main body portion 24 is increased, so that the expansion restriction portion 26 is opened, and the length (projection amount) of the columnar protruding portion 25 from the main body portion 24 becomes relatively long. That is, the yarn temporarily fixing the folded base cloth is broken and the base cloth spreads, so that the protrusion amount of the columnar protrusion 25 becomes longer than that in the first unfolded state.

  Therefore, the columnar protrusion 25 slides in the sub vent hole 28 and is inflated and expanded to the outside of the outer bag 21. 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 to the outside of the airbag 20 without being supplied to 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 open in the outer bag 21, the gas in the inner bag 22 is released from the inner vent hole 23. The outer bag 21 is inflated and deployed by being supplied into the bag 21, but when the second deployed state is reached, gas is not supplied to the outer bag 21.

  Therefore, the expansion amount of the outer bag 21 (in particular, the expansion amount in the vehicle width direction) can be suppressed to be small. Along with this, the amount of expansion of the inner bag 22 in the vehicle width direction can be suppressed to a smaller amount. Thereby, 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. Therefore, 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. Is opened to the outside of the outer bag 21. Thereby, for example, when an impact is applied to the vehicle due to a side collision or the like, the occupant C can be more appropriately adjusted regardless of the physique or the collision speed of the occupant C, that is, regardless of the size of the gap between the occupant C and the side door 3. Can be protected.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. The present invention can be modified as appropriate without departing from the spirit thereof.

  For example, in the above-described embodiment, the base end portion of the columnar protrusion 25 holds the base cloth forming the inner bag 22 in a folded state, and the expansion regulation unit 26 that regulates the expansion of the columnar protrusion 25 is provided. I chose However, the expansion restricting portion 26 is not particularly limited as long as it can restrict the expansion of the columnar protruding portion 25 in the first expanded state.

  For example, as shown in FIG. 6, the expansion restricting portion 26 may be composed of a first tether 31 and a second tether 32 that are string-shaped members. The first tethers 31 are connected to the inner surfaces 24a and 24b of the main body 24 of the inner bag 22 that face each other. Further, the first tether 31 is provided with a predetermined length so as to extend along the vehicle width direction with the airbag 20 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, respectively.

  With such a configuration, when the airbag 20 is in the first deployed state (FIG. 6A), that is, when the main body portion 24 is deployed relatively large in the vehicle width direction, the first tether 31 extends. It will be in a state where it is in a tensioned state. Therefore, the movement of the second tether 32 toward the vehicle front side is restricted. Therefore, the expansion in the vicinity of the base end of the columnar protrusion 25 to which both ends 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 loosened state (a state in which no tension is applied), and the second tether 32 is in front of the vehicle. Movement to the side is allowed. Therefore, expansion in the vicinity of the base end of the columnar protrusion 25 to which both ends of the second tether 32 are connected is allowed.

  Even if the inflation restricting portion 26 has such a configuration, the inflation amount of the columnar protrusion 25 in the first deployed state and the second deployed state is appropriately controlled to appropriately adjust the internal pressure of the airbag 20. You can

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

1 Seat 2 Seat Back 3 Side Door 10 Side Air Bag Device 20 Air Bag 21 Outer Bag 22 Inner Bag 23 Inner Vent Hole 24 Main Body 25 Columnar Projection 26 Expansion Limiting Part 27 Outer Vent Hole 28 Sub Vent Hole 29 Belt Member 30 Guide Member 31 1st tether 32 2nd tether 40 Inflator

Claims (3)

A side airbag device for inflating and deploying an airbag with an inflator between a side member of a vehicle and an occupant seated on a seat,
The airbag has an outer bag forming an outer peripheral surface of the airbag, and an inner bag arranged inside the outer bag and supplied with gas from the inflator,
The inner bag is
An inner vent hole for discharging the gas supplied from the inflator, a main body portion that is deployed in the outer bag, and a columnar protrusion that protrudes outward in a columnar shape from the main body portion when the airbag is deployed. While the outer bag 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,
In the inner bag, the inner vent hole is located inside the insertion hole and opens inside the outer bag in the first deployed state, and the inner bag is closer to the airbag in the vehicle width direction than in the first deployed state. In a second deployed state in which the deployed width is narrow, the inner vent hole is located outside the insertion hole and is configured to open to the outside of the outer bag,
Gas is supplied to the inner bag from the rear side of the vehicle by the inflator, and the columnar protruding portion is provided so as to protrude from the main body portion toward the front side of the vehicle. Side airbag device characterized by. The side airbag device according to claim 1,
At the boundary between the columnar protrusion and the main body, the base fabric forming the inner bag is held in a folded state to expand the columnar protrusion in the first unfolded state. A side airbag device characterized in that a restriction portion is provided . A side airbag device for inflating and deploying an airbag with an inflator between a side member of a vehicle and an occupant seated on a seat,
The airbag has an outer bag forming an outer peripheral surface of the airbag, and an inner bag arranged inside the outer bag and supplied with gas from the inflator,
The inner bag is
An inner vent hole for discharging the gas supplied from the inflator, a main body portion that is deployed in the outer bag, and a columnar protrusion that protrudes outward in a columnar shape from the main body portion when the airbag is deployed. While the outer bag 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,
In the inner bag, the inner vent hole is located inside the insertion hole and opens inside the outer bag in the first deployed state, and the inner bag is closer to the airbag in the vehicle width direction than in the first deployed state. In a second deployed state in which the deployed width is narrow, the inner vent hole is located outside the insertion hole and is configured to open to the outside of the outer bag,
In addition, by holding the base cloth forming the inner bag in a folded state at the boundary between the columnar protrusion and the main body, expansion of the columnar protrusion is restricted in the first unfolded state. A side airbag device characterized in that an inflation restricting portion is provided .

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