JP2012025182A - Side airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect both of an occupant of a proper position and an occupant of a non-proper position with desirable characteristics of a side airbag device which expands the airbag to side of the occupant who takes a seat.SOLUTION: An expansion part 30 of the airbag 11 is divided into front and rear parts by a partition 40, and a first expansion part 41 and a second expansion part 42 are formed. The partition 40 is prepared at a position of ribs L of the occupant A of proper position. A communication port 44 which carries out communication of the first expansion part 41 and the second expansion part 42 is formed in the partition 40. The influence given to the occupant of the non-proper position is suppressed while the occupant A of the proper position is protected with sufficient reaction force from an early stage.

Description

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

  2. Description of the Related Art Conventionally, for example, a side airbag device is known in which an airbag is deployed to the side of an occupant seated in a car seat to protect the occupant. The side airbag device includes an airbag housed in a side portion of a seat and an inflator that supplies gas to the airbag, and deploys the airbag between a passenger seated in a side collision and a door to Is supposed to protect.

  As such a side airbag device, a seam is formed by sewing the opposing portions of the airbag base fabric, the inside of the airbag is divided into a main inflation chamber and a sub-inflation chamber, and the seam portion is a gas Is known to be able to pass through (see, for example, Patent Document 1). In this configuration, the main expansion chamber is arranged so as to correspond to the thoracic part of the occupant, and the internal pressure of the main expansion chamber is ensured in the initial stage of deployment, and when the occupant comes into contact with the airbag, gas is passed through the seam passage. It flows from the main expansion chamber to the sub-expansion chamber to reduce the internal pressure of the main expansion chamber.

  That is, in this configuration, the main expansion chamber is disposed so as to correspond to the thoracic portion of the occupant, and the front end portion of the seam is disposed in front of the thoracic portion of the occupant.

JP-A-2005-29073

  In the configuration including the main expansion chamber corresponding to the thoracic part of the occupant as in the conventional case, the airbag is deployed forward to the seam position, that is, the position exceeding the occupant's thoracic part at the initial stage of deployment. Here, the occupant is not seated at an appropriate position of the seat with the seat belt attached, and the occupant is present at an improper riding position such as a position along the door where the airbag is deployed. of position), the occupant is pushed forward to a certain size by the airbag. On the other hand, if the dimension that the airbag is deployed at the initial stage of deployment is small, the area that restrains the passenger at the proper position is reduced.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a side airbag device that can protect an occupant at an appropriate position and suppress an influence on the occupant at an inappropriate ride position.

  The side airbag device according to claim 1 is provided in a vehicle compartment of a vehicle, and a deployment direction from the back side of the occupant toward the front side along a space between the occupant seated in the seat and a side wall portion of the cabin. A side airbag device having an airbag that is inflated and deployed, and an inflator that supplies gas to the airbag, wherein the airbag includes an inflating portion into which gas is introduced from the inflator, and the inflating portion to the inflating portion. A partition that is partitioned in a deployment direction and forms a first expansion portion on the upstream side of the gas and a second expansion portion on the downstream side of the first expansion portion, and the first expansion portion and the second partition provided on the partition. A communication port that communicates with the inflatable part, and the partition is seated at an appropriate position of the seat in the deployed state of the first inflated part in the deployed state of the airbag. Corresponding to the side of the crew's ribs Those disposed location.

  The side airbag device according to claim 2 is the side airbag device according to claim 1, wherein the airbag constitutes the outer shell of the inflating portion and is located on the seat side in the deployed state. And an outer base cloth part positioned in the width direction, and the partition wall is a belt having a dimension in the width direction, and connects the inner base cloth part and the outer base cloth part so as to be separable in the width direction.

  According to the side airbag device of the first aspect, the gas supplied from the inflator to the inflating portion when the air bag is inflated and deployed is first supplied to the first inflating portion on the upstream side, and the first inflating portion is inflated. Next, the first inflatable portion is supplied to the second inflatable portion on the downstream side through the communication port of the partition wall, and the second inflatable portion is inflated and deployed. The occupant seated in the seat is protected by restraining movement to the side by restraining the first inflatable portion and the second inflatable portion by the airbag inflated and deployed, and restraining contact with the side wall portion. The At the initial stage of deployment of the airbag, the first inflatable portion is rapidly inflated and deployed at a predetermined internal pressure, and at least a part of the side portion of the rib portion of the occupant can be restrained and protected with a predetermined reaction force. On the other hand, since the position of the front end portion in the deployment direction of the first inflating portion is disposed at a position corresponding to the side portion of the rib portion of the occupant seated at the appropriate position of the seat, the airbag in which the occupant is in an inappropriate riding position Even when the vehicle is present in the front in the unfolding direction, it is possible to reduce the distance that the passenger at the inappropriate riding position is moved by being pressed by the first inflating portion. Since the second inflating part that inflates and deploys following the first inflating part is inflated and deployed gradually at a lower pressure than the first inflating part, the influence on the occupant at the inappropriate riding position can be suppressed and protected. By adjusting the communication port provided in the partition wall, it is possible to easily adjust the reaction force characteristics of the first inflatable portion and the second inflatable portion when the passenger is restrained.

  According to the side airbag device of the second aspect, in addition to the effect of the first aspect, since the partition wall has a band shape having a dimension in the width direction, the inner base fabric portion and the outer base fabric portion at the position of the partition wall. Separation is possible, that is, the stroke of the inflating portion is secured, and contact with the side wall of the occupant can be suppressed and protected.

It is explanatory drawing seen from the side of the state which the airbag which shows one Embodiment of the side airbag apparatus of this invention expand | deployed. It is explanatory drawing seen from the upper side of a side airbag apparatus same as the above. It is a perspective view of the airbag of a side airbag apparatus same as the above. It is explanatory drawing seen from the side of a side airbag apparatus same as the above. It is explanatory drawing explaining the operation | movement with respect to the passenger | crew of the improper boarding position of a side airbag apparatus same as the above, (a) is a state at the initial stage of deployment, and (b) is a state following (a). It is a graph explaining operation | movement of a side airbag apparatus same as the above. It is a graph explaining operation | movement of a side airbag apparatus same as the above. It is explanatory drawing seen from the side of the state which the airbag which shows other embodiment of the side airbag apparatus of this invention expand | deployed.

  Hereinafter, an embodiment of a side airbag device of the present invention will be described with reference to the drawings.

  1 to 4, reference numeral 1 denotes a side airbag device. The side airbag device 1 is attached to a seat 4 of a passenger compartment 3 of a vehicle 2 that is an automobile, and includes a passenger A seated in the seat 4 and a door. The airbag 11 is inflated and deployed along the side wall portion 6 of the passenger compartment 3 to restrain the occupant and to prevent the seated occupant A from being in contact with the side wall portion 6 while being restrained. In each figure, the occupant A is shown by a dummy, and the occupant A shown in FIGS. 1 and 3 is a side collision dummy (trade name ES-2 dummy model) that imitates an adult male. Further, an occupant B shown in FIG. 5 is a dummy imitating a child. Further, the directions such as front and rear, both sides, and up and down are based on the straight traveling direction of the vehicle 2, F in FIG. 1 is the front as the deployment direction, U is the upper side, and W in FIG. 2 is the outer side along the width direction. . The seat 4 includes a seat portion 4a and a back portion (seat back) 4b erected upward from the rear portion of the seat portion 4a. The back portion 4b is provided so as to be adjustable in angle, and is normally used in an inclined state as shown in FIG. 1. Hereinafter, the back portion 4b is vertical as shown in FIG. In the following description, it is assumed that the upper side is vertically erected.

  The side airbag device 1 includes a bag-like airbag 11 that is inflated and deployed when supplied with a gas, an inflator 12 that supplies gas to the airbag 11, and the airbag 11 and the inflator 12 that are seated. 4 is provided with a fixture 16 that is an attachment member that is fixed to 4 and a resin case body (not shown) that is a cover for storing these members, and is stored in a storage position 18 provided on the side of the back portion 4b of the seat 4. And fixed to a frame (seat frame) 4c of the seat 4. The side airbag device 1 includes a control device (not shown) provided in the vehicle 2, and the inflator 12 is controlled by the control device.

  The inflator 12 includes a substantially columnar main body 21 and a gas supply unit 22 protruding from an upper end that is one end of the main body 21. In addition, a lower end portion which is the other end portion of the main body portion 21 is provided with a connector (not shown) that is connected to the control means and activates the inflator 12. The gas supply unit 22 is also called a diffuser, and protrudes from one end of the main body 21 into a cylindrical shape having a smaller diameter than the main body 21, and a plurality of circular holes serving as gas discharge ports on the peripheral surface Is formed. The inflator 12 can take various forms. For example, the inflator 12 is a so-called hybrid type, and when the ignition signal flows through the connector, the propellant filled in the main body 21 is reacted, and the main body 21 The gas stored in the cylinder inside is released, and the gas at a relatively low temperature is injected from the gas supply unit 22.

  The fixture 16 is also called a retainer, and includes a retainer main body portion 25 formed by bending a sheet metal, and a pair of bolts as attachment means (not shown) fixed to the retainer main body portion 25. The retainer main body portion 25 includes a substantially flat substrate portion 26 and an inflator holding portion 27 that is integrally extended from the substrate portion 26 to the front side that is the outer side. The inflator holding portion 27 is curved into a substantially cylindrical shape into which the main body portion 21 of each inflator 12 can be inserted, and the tip portion is fastened and fixed to the substrate portion 26 with a fixing tool such as a bolt or a rivet. -Hold the tab 12 securely. Further, the bolt is fixed to the substrate portion 26 of the retainer main body portion 25 and protrudes from the back surface side.

  The airbag 11 is inflated and deployed in a deployment direction from the rear side of the occupant A to the front side, that is, from the rear side to the front side. The airbag 11 is stitched with a base fabric called one or more panels, and the inside is inflated. It is configured in a bag shape as an inflating part 30 which is an air chamber into which gas is introduced. In the present embodiment, the inner base cloth part 31 located on the seat 4 side, that is, the occupant A side in the unfolded state, and the outer base cloth part 32 located on the outer side of the inner base cloth part 31 and located on the side wall part 6 side. 4 and the outer peripheral base fabric portion 33 that connects the outer peripheral portions of the base fabric portions 31 and 32 are joined together by sewing along the joining line 34 shown in FIG. An outer shell 35 of a flat bag made of a single base fabric is formed. Further, an opening 37 for inserting the inflator 12 and the like is provided at the rear end of the outer shell 35, and the inflator 12 is disposed at the rear side of the inflating part 30.

  Further, a strip-shaped partition wall 40 is provided inside the airbag 11, and the partition wall 40 divides the inflating portion 30 in the deployment direction, that is, in the front-rear direction, and is located on the rear side and serves as an air chamber on the upstream side of the gas. A first inflating part 41 and a second inflating part 42 which is located in front of the first inflating part 41 and serves as an air chamber on the downstream side of the gas are provided. In other words, the first expansion portion 41 that is a high-pressure chamber and the second expansion portion 42 that is a low-pressure chamber are partitioned and formed using the partition wall 40 that partitions the expansion portion 30 as a longitudinal direction in the direction intersecting the deployment direction. It is a parallel bag. The partition 40 is formed as a divided band by a strip-shaped base fabric having dimensions in the width direction, and both side portions are connected to the inner base fabric portion 31 and the outer base fabric portion 32 by the partition joint line 43 shown in FIG. The inner base fabric portion 31 and the outer base fabric portion 32 are connected so as to be separable in the width direction, and the expansion size of the inflatable portion 30 of the airbag 11, that is, the outer shell 35 is regulated. It can be flattened with a predetermined width. Further, the partition wall 40 has an upper end portion sewn and joined to the upper side portion of the outer peripheral base fabric portion 33, and a lower end portion sewn and joined to the lower side portion of the outer peripheral base fabric portion 33. The partition wall 40 has a longitudinal or vertical middle portion that is vertical or slightly inclined and has a straight line shape when viewed from the side. Further, in this partition wall 40, only the vicinity of the upper and lower end portions connected to the outer peripheral base cloth portion 33 is curved in a curved shape toward the rear side. The position of the front end, which is the front end of the partition wall 40, that is, the first inflating portion 41, is, as will be described later, the occupant A who is seated at an appropriate position of the seat 4 and is fitted with a seat belt when the airbag 11 is deployed. It arrange | positions in the position corresponding to the rib part L, ie, the position which opposes the side part of the rib part L, More preferably, it arrange | positions along the center position of the front-back direction of the rib part L of the passenger | crew A. In other words, the inflatable portion 30 that is the combination of the first inflatable portion 41 and the second inflatable portion 42 covers the entire lateral direction of the rib portion L of the occupant A, but the first inflatable portion 41 is in the proper position. It does not cover the entire lateral direction of the occupant A, but covers only a part.

  In addition, the partition wall 40 is formed with a communication port 44 that allows the first expansion portion 41 and the second expansion portion 42 to communicate with each other. This communication port 44 allows the gas to communicate with the first expansion portion 41 and the second expansion portion 42 while having a predetermined ventilation resistance, and is formed with one or a plurality of through holes. In the present embodiment, It is formed by two circular holes that are spaced apart in the vertical direction.

  Further, the outer shell 35 of the airbag 11 is provided with a vent hole 46 that is an exhaust port that communicates the inflating portion 30 to the outside. In the present embodiment, the vent hole 46 is formed as a single circular hole that opens forward in the outer peripheral base fabric portion 33 positioned at the middle portion in the vertical direction at the front end portion of the airbag 11. .

  Further, the rear end portion of the airbag 11 provided with the opening 37 of the outer shell 35 is a base portion 48 that is folded inward, and the base portion 48 includes base cloth portions 31, 32. A mounting hole (not shown) penetrating through is formed.

  Although not shown, a reinforcing cloth called a flameproof cloth or the like is sewed on the inside or the outside of the outer shell 35 as needed.

  Next, an assembly process of the side airbag device 1 will be described.

  First, the inflator 12 is configured by attaching the inflator 12 to the fixture 16. Then, the inflator unit is inserted into the inflatable portion 30 from the opening 37 at the rear end of the sewn airbag 11, the base 48 of the airbag 11 is folded, and the bolt of the fixture 16 is pulled out from the mounting hole. Secure with nuts (not shown). In this state, the gas supply unit 22 of the inflator 12 is disposed in the vicinity of the rear end portion of the first expansion unit 41.

  Then, the airbag 11 combined with the inflator 12 and the fixture 16 in this way is folded into a predetermined shape, and further, the airbag 11, the inflator 12 and the fixture 16 are housed in a case as necessary, and the side An airbag device 1 is configured. And this side airbag apparatus 1 is accommodated in the storage position 18 of the side part of the seat 4, and is attached to the seat 4 of a motor vehicle by fixing each bolt of the fixture 16 to the frame 4c of the seat 4, etc. That is, the airbag 11 and the inflator 12 are attached to the vehicle body via the fixture 16. Furthermore, the connector of the inflator 12 of the side airbag device 1 is connected to a control device provided on the vehicle 2 side via a harness (not shown). The control device includes a CPU and is connected to one or more sensors, and starts the inflator 12 at a predetermined timing according to the state of the occupant and the state of the collision obtained by these sensors.

  Next, a deployment operation of the side airbag device 1 will be described.

  When the vehicle 2 receives an impact such as a side collision, the control unit activates the inflator 12 in a state suitable for occupant protection and injects gas from the gas supply unit 22. Then, the gas is first supplied directly to the first inflating portion 41, and the first inflating portion 41 is inflated and deployed. Then, with this inflating and deploying pressure, the airbag 11 projects from the seat 4 with the cover open, and inflates and deploys forward. In this initial development state, the flow of gas into the second expansion portion 42 is suppressed by the partition wall 40, so that the first expansion portion 41 expands quickly, that is, the first expansion is greater than the second expansion portion 42. The internal pressure of the portion 41 is quickly increased, and a necessary reaction force is ensured. Further, in the later stage of expansion after the first inflating part 41 is inflated and deployed, gas is gradually introduced from the first inflating part 41 to the second inflating part 42 through the communication port 44 of the partition wall 40, and the second inflating part. 42 gradually expands and expands, and the pressures of the first and second inflating portions 41 and 42 become equal.

  Therefore, for example, in the case of an average adult male occupant A who is seated at a normal position of the seat 4 and wears a seat belt, as shown in FIGS. 1, 2, and 4, the chest of the occupant A is mainly used. The inflatable portion 30 of the airbag 11 is deployed between the occupant A and the side wall portion 6 of the vehicle 2 with a predetermined area, a predetermined thickness, and a predetermined internal pressure, that is, a predetermined reaction force. The passenger A is protected. Since the first inflating portion 41 constituting the inflating portion 30 is rapidly inflated and deployed with a sufficient internal pressure, that is, a reaction force at the initial stage of deployment, even if the occupant A tries to move sideways at the initial stage of deployment, the airbag 11 The occupant A can be restrained and protected by the first inflating portion 41. That is, for the occupant A seated at the proper boarding position, the back 4b side of the occupant A can be restrained from the early stage by the high-pressure first inflatable portion 41, and further, the deployment of the first inflatable portion 41 continues. After the pressure of the second inflating portion 42, which is lower than that of the first inflating portion 41, becomes the same size as that of the first inflating portion 41, the entire occupant restraint surface can be restrained by the occupant restraining surface formed to be large. Further, the gas is exhausted from the vent hole 46 after the airbag 11 is fully deployed or when the occupant A is in contact with the airbag 11.

  On the other hand, when the occupant B is present at the improper boarding position, for example, as shown in FIG. 5, the occupant B as a child has a backward riding posture on the front portion in the deployment direction of the airbag 11 at the improper boarding position. In the case of existing proximity deployment or when the seated occupant A is seated while being displaced in the deployment direction of the airbag 11, only the first inflatable portion 41 is sufficient in the initial deployment state. Inflate and deploy rapidly with the internal pressure, that is, as shown in FIG. 5A, the inflated and deploy quickly with a sufficient internal pressure only up to a position corresponding to the side of the rib portion L of the occupant A at the maximum. That is, the high-pressure first inflating portion 41 is formed with a short dimension in the front-rear direction with respect to the entire inflating portion 30. Therefore, even if the occupant B is very close to the outer edge of the back portion 4b of the seat 4, the first inflating portion 41 that rapidly inflates and deploys with sufficient internal pressure to protect the occupant A in the normal position. The distance to which the passenger B in the non-regular position is pushed is small, so that the pressing force is greatly reduced as compared with the airbag having an air chamber that integrally covers the side of the passenger A. The influence on B is suppressed. In the later stage of deployment, as shown in FIG. 5 (b), the second inflating part 42 inflates and deploys, and the occupant B is pushed by the second inflating part 42. The communication port 44 prevents gas from flowing in. Therefore, the occupant B is softly pressed forward by the second inflating portion 42 that gradually inflates and deploys at a low pressure, and the influence on the occupant B at the non-regular position is suppressed.

  FIG. 6 shows a graph of a waveform of an experimental result obtained by measuring a reaction force applied from the airbag 11 to the occupant B at an inappropriate riding position. The horizontal axis t is time [milliseconds], the vertical axis F1 is reaction force [kN], B1 is an airbag 11 having the partition 40 of the above embodiment, and B2 is an airbag without a partition used as a comparative example. It is. In the airbag of this comparative example, the gas input of the inflator 12 is directly a reaction force to the occupant, whereas the airbag 11 of the present embodiment has once input the gas at the first inflating portion 41 on the upstream side. The reaction force to the occupant B is reduced because the gas flows through the communication port 44 to the second inflating portion 42 on the distal end side. And, according to the graph of this experimental result, the maximum value of the reaction force at the initial stage of deployment of the airbag 11 of the present embodiment is reduced by C in the figure, and the reaction force to the passenger B in the proximity deployment can be reduced. Was confirmed.

  FIG. 7 shows a graph of a waveform of an experimental result obtained by measuring the reaction force of the airbag 11 against the occupant A at an appropriate position. The horizontal axis S is shown as a negative value of the thickness dimension of the airbag 11, that is, the remaining stroke amount [mm], and the remaining stroke amount is larger toward the left side. The origin on the right side is the remaining stroke because the airbag is crushed. There is no state. The vertical axis F2 is the reaction force [kN] when the airbag 11 comes into contact with the occupant A at the appropriate position, D1 is the airbag 11 provided with the partition wall 40 of the above embodiment, and D2 is used as a comparative example. The airbag does not have a partition wall. This graph shows that the reaction force of the airbag 11 of the present embodiment provided with the partition wall 40 is larger than that of the comparative example when compared with the same remaining stroke amount, that is, the same thickness dimension. ing. This is because the air bag composed of one chamber of the comparative example has a large capacity, so that the internal pressure increases, that is, it takes time to obtain the reaction force necessary to restrain the occupant, but it is composed of two chambers. In the present embodiment, it is understood that the internal pressure of the small-capacity first inflating portion 41 has rapidly increased. Then, according to the graph of this experimental result, in the region E between D1 and D2 in the figure, the airbag 11 according to the present embodiment, which has two chambers, increases the slope of the rise of the reaction force, so that the initial deployment stage As a result, it was confirmed that the occupant A at the proper position could be restrained early.

  As described above, according to the present embodiment, the front side of the occupant A is viewed from the back side along the space between the occupant A seated in the seat 4 and the side wall portion 6 of the cab 3 in the passenger compartment 3 of the vehicle 2. In the side airbag device 1 having an airbag 11 that is inflated and deployed in a deployment direction toward the side, and an inflator 12 that supplies gas to the airbag 11, the airbag 11 is an inflatable portion into which gas is introduced from the inflator 12 30, a partition wall 40 that divides the expansion portion 30 in the development direction and forms a first expansion portion 41 on the upstream side of the gas and a second expansion portion 42 on the downstream side of the first expansion portion 41, and the partition wall 40 Provided with a communication port 44 that communicates the first inflatable portion 41 and the second inflatable portion 42, and the partition wall 40 is in a deployed state of the first inflatable portion 41 in the deployed state of the airbag 11. Is located at a position corresponding to the side of the rib part L of the occupant A seated at an appropriate position of the seat 4 It has been. Therefore, the gas supplied from the inflator 12 to the inflating part 30 when the airbag 11 is inflated and deployed is first supplied to the first inflating part 41 on the upstream side, and the first inflating part 41 is inflated and deployed. The first inflating part 41 is supplied to the second inflating part 42 on the downstream side through the communication port 44 of the partition wall 40, and the second inflating part 42 is inflated and deployed. The occupant A seated in the seat 4 is restrained from moving laterally by being restrained by the airbag 11 in which the first inflatable portion 41 and the second inflatable portion 42 are inflated and deployed, and is in contact with the side wall portion 6. Is suppressed and protected.

  Then, when the airbag 11 is initially deployed, the first inflating portion 41 is rapidly inflated and deployed with a predetermined sufficient internal pressure, that is, with a predetermined sufficient reaction force. Even so, the airbag 11 can be protected by restraining at least a part of the side portion of the rib portion L of the occupant A seated at an appropriate position by the first inflating portion 41 with a predetermined reaction force.

  On the other hand, the position of the distal end portion in the deploying direction of the first inflating portion 41 is arranged at a position corresponding to the side portion of the rib portion L of the occupant seated at an appropriate position of the seat 4. At the maximum, only the position corresponding to the side portion of the rib portion L of the occupant A is rapidly inflated and deployed. Therefore, even in the case of a so-called OOP in which the occupant B is in the vicinity of the front surface in the deployment direction of the airbag 11 at the improper boarding position, the occupant B of the seat 4 at the improper boarding position is the first inflating portion 41. Since the second inflated portion 42 that is inflated and deployed following the first inflatable portion 41 is gradually inflated and deployed at a lower pressure than the first inflatable portion 41, the distance that is moved by being pressed can be reduced. The pressing force applied to the occupant B by 11 can be greatly reduced, and the influence on the occupant B at the inappropriate riding position can be suppressed and protected.

  In this way, by separating the first inflatable portion 41 and the second inflatable portion 42 by the partition wall 40 provided at the position of the rib portion L of the occupant A at an appropriate position, both the occupant restraint performance and the reduction of the influence on the occupant are achieved. That is, it is possible to easily realize a desirable characteristic of suppressing the influence on the occupant B at the improper boarding position while protecting the occupant A at the appropriate position with a sufficient reaction force from an early stage.

  In addition, the airbag 11 is adjusted by adjusting the ventilation resistance, that is, the opening area and shape of the communication port 44 of the partition wall 40 that allows gas movement from the first inflating portion 41 to the second inflating portion 42. The internal pressure of the part 41 and the second inflating part 42, that is, the characteristic of the reaction force when restraining the occupant can be easily adjusted.

  Further, since the airbag 11 defines the inflatable portion 30 by the partition wall 40 and forms the first inflatable portion 41 on the upstream side, the first inflatable portion 41 can be smoothly and quickly made with sufficient internal pressure by efficiently using the gas pressure. Thus, the inflator 12 can be miniaturized.

  The airbag 11 includes an inner base fabric portion 31 that is located on the seat 4 side and an outer base fabric portion 32 that is positioned on the side wall portion 6 side in the deployed state. Is a strip having a dimension in the width direction, and connects the inner base fabric portion 31 and the outer base fabric portion 32 so as to be separable in the width direction, and the partition wall 40 has a strip shape having a dimension in the width direction. The inner base cloth part 31 and the outer base cloth part 32 can be separated from each other at the position 40, that is, the stroke of the inflating part 30 is secured, and the contact of the occupant A with the side wall part 6 can be suppressed and protected.

  Further, in the present embodiment, the outer peripheral base fabric portion 33 is provided in the outer peripheral portion of the outer shell 35 of the inflatable portion 30, and the stroke is ensured in almost the entire inflatable portion 30 that is the protection region of the airbag 11. The contact of the occupant A with the side wall portion 6 can be suppressed and protected.

  In the above-described embodiment, the partition wall 40 and the outer peripheral base fabric portion 33 that connect the inner base fabric portion 31 and the outer base fabric portion 32 are both formed of a band-shaped base fabric, but the configuration is not limited thereto. For example, the joint portions on the outer periphery of the partition wall 40 and the outer shell 35 can be formed by directly connecting the inner base fabric portion 31 and the outer base fabric portion 32 by stitching using a thread or the like.

  Further, the deployment shape of the airbag 11 can take an appropriate shape depending on the shape of the region that needs to be protected. For example, as shown in FIG. 8, the first inflating portion 41 is formed so that the vertical dimension gradually increases from the rear end portion, which is the base end, toward the portion of the partition wall 40, which is the front end side, in a side view. You can also

  In addition, the inflator 12 may adopt a so-called pyro type configuration in which gas is supplied by combustion in addition to the hybrid type.

  The present invention is used, for example, as a side airbag device that is housed in a side portion of a seat of an automobile and protects the occupant by deploying an airbag between the occupant and the door.

DESCRIPTION OF SYMBOLS 1 Side airbag apparatus 2 Vehicle 3 Car compartment 4 Seat 6 Side wall part
11 Airbag
12 Inflator
30 Expansion part
31 Inner base fabric
32 Outer base fabric
35 outer shell
40 Bulkhead
41 1st expansion part
42 Second expansion part
44 Communication port A Crew F Deployment direction L Rib

Claims (2)

An airbag provided in a vehicle cabin and inflated and deployed in a deployment direction from the back side of the occupant toward the front side along a side wall portion of the occupant seated on the seat and the airbag, and the airbag A side airbag device having an inflator for supplying gas to
The airbag includes an inflating portion into which a gas is introduced from the inflator, a first inflating portion that divides the inflating portion in the deployment direction, and a second inflating downstream of the first inflating portion A partition that forms a portion, and a communication port that is provided in the partition and communicates with the first expansion portion and the second expansion portion,
The partition is disposed at a position corresponding to a side portion of a rib portion of an occupant seated at an appropriate position of the seat when the airbag is in a deployed state and the position of the distal end portion in the deployment direction of the first inflating portion is A side airbag device characterized by that. The airbag includes an inner base fabric portion that is positioned on the seat side in the deployed state and forms an outer shell of the inflatable portion, and an outer base fabric portion that is positioned on the side wall portion side,
2. The side airbag device according to claim 1, wherein the partition wall is a belt having a dimension in the width direction and connects the inner base fabric portion and the outer base fabric portion so as to be separable in the width direction.

Images