JP2005186891A - Side airbag device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side airbag device for a vehicle which enables early restraint of an occupant's waist part by securing and maintaining an internal pressure difference between an airbag part for protecting the occupant's body waist part and an airbag part for protecting the occupant's chest to abdomen parts. <P>SOLUTION: An airbag 11 is provided with a sewing part 11c which divides the interior of the airbag into an upper airbag chamber 11a and a lower airbag chamber 11b. The upper airbag chamber protects the occupant P's chest to abdomen parts, and the lower air bag chamber protects the occupant P's near waist part. Then the sewing part 11c generates a requested pressure difference by appropriately distributing the gas generated by an inflater 12 to the upper and lower airbag chambers 11a, 11b. The sewing part 11c is extended stretching from the position which can be caught between a case 13 and an opening and closing part 13a to the front of the airbag 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a side airbag device for a vehicle.

In general, a side airbag device for a vehicle includes a folded side airbag and an inflator that supplies gas into the side airbag. These side airbags and inflators are housed in seats and door trims while being housed in a module case. When an impact exceeding the set value is applied from the side of the vehicle body, the inflator ignites and the generated gas enters the vehicle interior. The side air bag is deployed between the vehicle body constituting member (for example, the door trim of the side door, the B pillar, etc.) and the occupant seated on the seat to reduce the impact applied to the occupant.
A recent side airbag device tends to include a side airbag that expands a protection area so as to be deployed so as to protect a substantially lower back from an approximately chest of an occupant. When deploying such a side airbag, the internal pressure (drag) of the airbag part that protects the occupant's waist is protected from the occupant's approximate chest to reduce the occupant's lower back injury value during a side impact. It is necessary to ensure about 3 to 4 times higher than the internal pressure of the airbag portion.

Therefore, a side airbag device is proposed that is configured so that when the airbag is deployed, the airbag portion that protects the occupant's substantially lower waist is deployed earlier and the internal pressure is higher than the airbag portion that protects the abdomen from the occupant's approximate chest. (For example, refer to Patent Document 1).
In such a side airbag device 1, as shown in FIG. 18, an airbag portion that protects the substantially abdomen from the substantially chest portion of the occupant in the airbag 2, and an airbag portion that protects the substantially lumbar portion of the occupant A suturing portion 3 (shown by a broken line in the figure) is disposed between the upper airbag chamber 2a for protecting the abdomen from the substantially chest portion of the occupant and the lumbar portion of the occupant. The lower airbag chamber 2b is formed, and the gas G blown from the lower portion of the inflator 4 is appropriately distributed so that the lower airbag chamber 2b is deployed earlier than the upper airbag chamber 2a when the airbag is deployed, and the internal pressure is increased. Is configured to do.

However, in the above-described conventional side airbag device for a vehicle, as shown in FIG. 18, the upper airbag chamber 2 a and the lower airbag chamber 2 b are connected to both the front and rear sides of the stitched portion 3. Therefore, as shown in FIG. 19, when the lower airbag chamber 2b is sandwiched between the substantially waist portion of the occupant P and the vehicle body constituting member 5 entering toward the vehicle interior, the gas in the lower airbag chamber 2b is Since it flows into the upper airbag chamber 2a, there is a problem that it is difficult to secure and maintain the internal pressure difference between the upper airbag chamber 2a and the lower airbag chamber 2b.
And if it is difficult to secure and maintain the internal pressure difference between the upper airbag chamber 2a and the lower airbag chamber 2b at the time of a side collision, it will be difficult to accelerate the waist restraint of the occupant P. May be damaged.
JP-A-11-180244 (FIG. 7)

  Therefore, the present invention has been made to solve the problems of the vehicle side airbag device described above, and in the event of a side collision, the airbag portion that protects the occupant's substantially lower back and the occupant's An object of the present invention is to provide a vehicle side airbag device capable of securing and maintaining a difference in internal pressure with an airbag portion that protects a substantially abdominal portion from a substantially chest portion, and thereby accelerating occupant's waist restraint.

In order to achieve the above object, the invention according to claim 1 is an airbag that deploys so as to protect a substantially lower back from an occupant's substantially chest, the airbag before deployment, and gas generation that deploys the airbag. In a side airbag device for a vehicle having a case having an opening and closing portion opened by the airbag when deployed, and a seat back incorporating the case,
The airbag divides the airbag into an upper airbag chamber that protects the abdomen from the substantially occupant's chest and a lower airbag chamber that protects the occupant's waist, and the upper and lower airbag chambers include the airbag. First gas flow restriction means for appropriately distributing the gas generated by the gas generator to generate a desired pressure difference, and the first gas flow restriction means can be sandwiched between the case and the opening / closing portion. It is characterized by extending from the position to be connected to the front portion of the airbag.

In order to achieve the above object, the invention according to claim 2 is an airbag that deploys so as to protect a substantially lower back from an occupant's substantial chest, the airbag before deployment, and gas generation that deploys the airbag. In a side airbag device for a vehicle having a seat back incorporating the device,
The airbag divides the airbag into an upper airbag chamber that protects the abdomen from the substantially occupant's chest and a lower airbag chamber that protects the occupant's waist, and the upper and lower airbag chambers include the airbag. A second gas flow restricting means for distributing a gas generated by the gas generating device to generate a desired pressure difference; the second gas flow restricting means is directed toward the vehicle interior when the seat back collides with the seat back; It extends from the position which can be inserted | pinched by the vehicle body structural member which approachs by approaching so that the said airbag front part may be continued.

  According to a third aspect of the present invention, in order to achieve the above object, in addition to the configuration of the first or second aspect of the present invention, the first or second gas flow regulating means is provided to inflate the airbag. It is a sewing part which regulates development.

  In order to achieve the above-mentioned object, in addition to the configuration of the invention described in claim 1 or 2, the invention described in claim 4 includes the airbag in the deployed state and the side portion of the seat back. And at least one third gas flow regulating means for reducing the bag capacity of the airbag.

  According to a fifth aspect of the present invention, in order to achieve the above object, in addition to the configuration of the fourth aspect of the invention, the third gas flow regulating means includes a sewing portion that regulates the inflation of the airbag. It is characterized by being.

  In order to achieve the above object, a sixth aspect of the present invention, in addition to the configuration of the fourth aspect of the present invention, includes the first or second gas flow restriction means and the third gas flow restriction means. Is connected along the side portion of the seat back.

  According to a seventh aspect of the invention, in order to achieve the above object, in addition to the configuration of the first or second aspect of the invention, the first or second gas flow restricting means is provided at the time of the side collision. The vehicle body component that enters the interior of the vehicle body is provided at a height position corresponding to a recess formed in the body, close to the front end of the first or second gas flow regulating means, and An exhaust hole for discharging gas in the upper and lower airbag chambers to the outside of the airbag is provided opposite to the concave portion of the vehicle body constituting member.

  In order to achieve the above object, according to an eighth aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, the airbag is configured so that the gas generated by the gas generating device is transferred to the upper and lower portions. A gas rectifier that diverts toward the airbag chamber is provided.

  In order to achieve the above object, the invention according to claim 9 is characterized in that, in addition to the configuration of the invention according to claim 8, the gas rectifying means includes: a gas amount that causes the gas to flow into the upper airbag chamber; An opening for adjusting the amount of gas flowing into the lower airbag chamber is provided.

  In order to achieve the above object, a tenth aspect of the present invention is the height of the upper end portion of the airbag and the upper end portion of the case in a deployed state in addition to the configuration of the first aspect of the invention. It is characterized by substantially matching the positions.

  In order to achieve the object described above, the invention according to claim 11 includes, in addition to the configuration of the invention according to claim 1 or 10, a lower end portion of the airbag in a deployed state and a lower end portion of the case. The height position is substantially matched.

  In order to achieve the above object, the invention described in claim 12 is directed to the lower airbag chamber in the vicinity of the gas blowing portion of the gas generator in addition to the configuration of the invention described in claim 1 or 2. And a check valve for preventing the gas flowing into the lower airbag chamber from flowing out of the lower airbag chamber.

  According to a thirteenth aspect of the present invention, in order to achieve the above object, in addition to the configuration of the first aspect of the present invention, the upper airbag chamber and the lower airbag chamber are arranged between the upper airbag chamber and the upper airbag chamber. A check valve is provided to allow the gas to flow only from the airbag chamber toward the lower airbag chamber.

  In order to achieve the above-mentioned object, the check valve according to the fourteenth aspect of the invention, in addition to the configuration of the invention according to the twelfth or thirteenth aspect, causes the gas generated by the gas generator to flow. A variable flow path portion that is crushed by the pressure of the gas flowing into the upper or lower airbag chamber and blocks the gas flow is provided.

  In order to achieve the above-mentioned object, the end of the check valve is arranged in the vicinity of a substantially central position in the lower airbag chamber. It is located.

  According to the first aspect of the present invention, when the opening / closing part of the case is closed by the vehicle body constituent member that enters the vehicle interior at the time of a side collision, the first gas flow regulating means includes the case, the opening / closing part, Therefore, the gas flow between the upper airbag chamber and the lower airbag chamber is blocked. Therefore, even if the lower airbag chamber of the airbag developed at the time of a side collision is sandwiched between the substantially waist portion of the occupant and the vehicle body constituent member entering toward the vehicle interior, the gas in the lower airbag chamber remains Since it is prevented from flowing into the cabin, it becomes possible to secure and maintain the internal pressure difference between the upper airbag chamber and the lower airbag chamber, so that the occupant's waist restraint can be accelerated. Become.

  According to the second aspect of the present invention, when the second gas flow restricting means is sandwiched between the seat back and the vehicle body constituent member that enters the vehicle interior at the time of a side collision, the upper airbag chamber and the lower air bag The gas flow with the bag chamber is shut off. Therefore, even if the lower airbag chamber of the airbag chamber developed at the time of a side collision is sandwiched between the substantially waist portion of the occupant and the vehicle body constituent member entering toward the vehicle interior, the gas in the lower airbag chamber is Since it is prevented from flowing into the bag compartment, the internal pressure difference between the upper airbag compartment and the lower airbag compartment can be secured and maintained, so that the occupant's waist restraint can be accelerated. become.

  According to the invention described in claim 3, in addition to the operational effects of the invention described in claim 1 or 2, in a state where the first or second gas flow regulating means is sandwiched at the time of a side collision, The gas flow between the upper airbag chamber and the lower airbag chamber can be reliably blocked.

  According to the invention described in claim 4, in addition to the operational effects of the invention described in claim 1 or 2, since the airbag capacity is reduced by the arrangement of the third gas flow regulating means, the early stage of the airbag is achieved. Deployment performance is improved. Moreover, since the output of the gas generator can be reduced, it is possible to reduce harm to passengers who are not seated in the seat in a normal state, that is, deterioration of OOP (Out Of Position) performance.

  According to the invention described in claim 5, in addition to the function and effect of the invention described in claim 4, since the structure is simple, the early deployment performance of the airbag can be improved at low cost.

  According to the sixth aspect of the invention, in addition to the function and effect of the fourth aspect of the invention, the first or second gas flow restriction means and the third gas flow restriction means are connected to each other. Bag capacity is greatly reduced. Therefore, the early deployment performance of the airbag can be further improved, and the output of the gas generator can be further reduced, so that the OOP performance deterioration can be greatly reduced.

  According to the invention described in claim 7, in addition to the operational effects of the invention described in claim 1 or 2, the exhaust hole is blocked by the vehicle body structural member that enters the vehicle interior in a side collision. In addition, since the gas discharged from the exhaust hole is prevented from being blown out toward the occupant, the protection enhancement of the occupant can be improved.

  According to the invention described in claim 8, in addition to the operational effects of the invention described in claim 1 or 2, the gas generated by the gas generator is directed toward the upper and lower airbag chambers by the gas rectifying means. Since the flow is divided, the internal pressure difference between the upper airbag chamber and the lower airbag chamber can be more efficiently secured and maintained, and the occupant's waist restraint can be accelerated.

  According to the ninth aspect of the invention, in addition to the function and effect of the eighth aspect of the invention, the amount of gas flowing into the upper airbag chamber and the amount of gas flowing into the lower airbag chamber are adjusted by the opening. Therefore, the deployment speed and the internal pressure corresponding to the upper and lower airbag chambers can be easily obtained.

  According to the invention described in claim 10, in addition to the function and effect of the invention described in claim 1, the upper airbag chamber can be easily deployed forward, so that the protection of the occupant can be enhanced. The deployment of the upper airbag chamber can be stabilized and accelerated.

  According to the invention described in claim 11, in addition to the operational effects of the invention described in claim 1 or 10, the lower airbag chamber can be easily deployed forward, so that the protection of passengers can be enhanced. In addition, the deployment of the lower airbag chamber can be stabilized and accelerated.

  According to the twelfth aspect of the invention, in addition to the effects of the first or second aspect of the invention, the gas flowing into the lower airbag chamber is prevented from flowing out of the lower airbag chamber by the check valve. Therefore, the internal pressure difference between the upper airbag chamber and the lower airbag chamber can be secured and maintained easily, and the occupant's waist restraint can be accelerated.

  According to the invention described in claim 13, in addition to the operational effects of the invention described in claim 1 or 2, the gas flowing into the upper airbag chamber flows only toward the lower airbag chamber. The difference in internal pressure between the bag chamber and the lower airbag chamber can be easily secured and maintained, and the occupant's waist restraint can be accelerated.

  According to the invention described in claim 14, in addition to the effects of the invention described in claim 10 or 11, the gas flow is interrupted when the variable flow path portion is crushed by the gas pressure in the upper or lower airbag chamber. Therefore, the gas shut-off performance is improved, the internal pressure difference between the upper airbag chamber and the lower airbag chamber can be secured and maintained more reliably, and the occupant's waist restraint can be accelerated. Will be able to.

  According to the invention of the fifteenth aspect, in addition to the function and effect of the invention of the fourteenth aspect, the end portion of the check valve is located near the substantially central position of the lower airbag chamber. The gas shutoff performance of the stop valve is improved. Accordingly, particularly when the airbag is deployed, the pressure in the lower airbag chamber can be reliably ensured and maintained, and the waist restraining performance of the occupant can be improved.

  As a result, in the event of a side impact, the internal pressure difference between the airbag part that protects the occupant's waist and the airbag part that protects the abdomen from the occupant's approximate chest is secured and maintained, and the occupant's waist restraint is accelerated. It is possible to provide a vehicle side airbag device capable of achieving the above.

  By blocking the gas flow in the upper and lower airbag chambers using vehicle body components that enter the vehicle compartment during a side impact, the internal pressure difference between the upper and lower airbag chambers can be reliably secured and maintained. I made it.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view for explaining the outline of the side airbag device, FIG. 2 is a side sectional view showing a modification of the first gas flow regulating means in the example, and FIG. 3 is a module. FIG. 4 is a perspective view showing an airbag sandwiched between module cases, and FIG. 5 shows an airbag deployed between a vehicle body component and an occupant. FIG. 6 is a front view showing the airbag deployed between the vehicle body constituting member and the occupant during a side collision.

  First, the configuration of the side airbag device 10 will be described. As shown in FIGS. 1 and 2, the side airbag device 10 includes an airbag 11 that is deployed so as to protect an occupant side part in a side collision, and a gas generator that supplies gas into the airbag 11. 1 and an airbag module case (hereinafter referred to as a case) 13 in which the airbag 11 and the inflator 12 are housed.

  The case 13 is a seat 14 (indicated by a two-dot chain line in FIGS. 1 and 2) such as a driver seat, a passenger seat, or a rear seat, and a passenger P (one point in FIGS. 1 and 2). It is embedded in the side door side (the vehicle outer side) of the seat back 15 that supports the back portion (shown by a chain line). The side surface portion 13a facing the vehicle exterior side of the case 13, that is, the side surface portion 13a facing the vehicle body component member 16 side (shown in FIGS. 5 and 6) that enters the vehicle interior when a side collision occurs can be opened and closed. As shown in FIGS. 3 and 4, the opening / closing portion is configured to be opened toward the vehicle body component 16 by the airbag 11 that inflates and deploys forward when a side collision occurs. The side of the seat back 15 is pressed by the vehicle body constituting member 16 entering toward the vehicle, so that it is closed. That is, the side surface portion 13 a is configured to sandwich the proximal end portion side of the deployed airbag 11 when closed by the vehicle body constituting member 16.

  The inflator 12 accommodated in the case 13 is a metal cylinder member containing an ignition device, a transfer agent, and compressed gas (all not shown). When the ignition device ignites on the basis of an output signal from an airbag sensor (not shown) that has detected an impact higher than the set value at the time of a side collision, the inflator 12 is generated by burning a transfer agent and expanding compressed gas. The discharged gas is blown out from the gas outlet 12a. Then, the blown-out gas is caused to flow into the airbag 11 so that the airbag 11 is inflated and deployed. Further, the gas outlet 12a is disposed so as to be located on the lower side (on the side of the airbag portion that protects the substantially waist portion of the occupant P). As a result, when the airbag is deployed, the airbag portion that protects the substantially waist portion of the occupant P is deployed earlier and has a higher internal pressure than the airbag portion that protects the abdomen from the approximately chest portion of the occupant P.

  The airbag 11 is housed and disposed in the case 13 in a state where the airbag 11 is folded so as to be easily deployed forward and in the vertical direction on the side of the occupant P seated on the seat 14 (outside the vehicle body). In a state where the airbag 11 is deployed by the gas generated by the inflator 12, as shown in FIGS. 1 and 2, a range from the substantially chest portion to the substantially waist portion of the occupant P seated on the seat 14 is shown. In order to protect, it is formed in a vertically long bag shape.

The airbag 11 is divided into an upper airbag chamber 11a that protects the abdomen from the chest of the occupant P and a lower airbag chamber 11b that protects the lumbar portion of the occupant P. The gas generated by the inflator 12 is appropriately distributed up and down in the lower airbag chambers 11a and 11b so that a desired pressure difference, that is, the internal pressure of the lower airbag chamber 11b is about 3 to 4 times the internal pressure of the upper airbag chamber 11a. A sewing portion 11c is provided as a first gas flow regulating means for securing and maintaining a pressure difference that increases. The sewing portion 11c is extended from the position on the proximal end side of the deployed airbag 11 so as to be sandwiched between the case 13 and the side surface portion 13a so as to continue to the front portion of the airbag 11.
In addition, the sewing part 11c is not limited to a linear thing as shown in FIG. 1, For example, you may form in the curved thing as shown in FIG. Moreover, the sewing part 11c is not limited to a linear thing.

  As a result, the airbag 11 at the time of a side collision starts to be instantly deployed in the case 13 by the gas generated by the inflator 12, and the side surface portion 13a of the case 13 is opened to the outside of the vehicle and rapidly inflated forward. Unfolds and breaks the skin of the seat back 15 to protect the range from the vehicle body constituting member 16 entering toward the passenger compartment side from the substantially chest part to the substantially waist part of the occupant P (see FIG. 5). In the state where the airbag 11 is deployed, the internal pressure of the lower airbag chamber 11b is about 3 to 4 times higher than the internal pressure of the upper airbag chamber 11a. High internal pressure has been achieved.

The airbag 11 in the deployed state is pressed against the side portion of the seat back 15 by the vehicle body constituting member 16 entering the vehicle interior, and the side surface portion 13a of the case 13 is closed. Is sandwiched between the case 13 and the side surface 13a (see FIGS. 4 and 6). In the airbag 11 in which the base end side is sandwiched, the gas flow between the upper and lower airbag chambers 11 a and 11 b is blocked by the sewing portion 11 c and the case 13. Therefore, even if the lower airbag chamber 11b of the airbag 11 deployed at the time of a side collision is sandwiched between the substantially waist portion of the occupant P and the vehicle body component member 16 entering toward the vehicle interior, the interior of the lower airbag chamber 11b Gas is prevented from flowing into the upper airbag chamber 11a, so that an internal pressure difference between the upper airbag chamber 11a and the lower airbag chamber 11b can be secured and maintained, and the waist restraint of the occupant P can be restrained. It will be possible to speed up.
And since the waist restraint of the occupant P is accelerated, the vehicle body constituent member entering the vehicle interior can first push the waist of the occupant P that strikes toward the vehicle interior, The lower back injury value of the occupant P at the time of a side collision can be reduced.

  In addition, you may implement a present Example, changing as follows.

  In other words, the first embodiment described above is configured such that the case 13 containing the airbag 11 and the inflator 12 is embedded in the seat back 15. Therefore, the sewing part 11c is extended so as to be connected to the front part of the airbag 11 from a position where it can be sandwiched between the case 13 and the side part 13a on the base end side of the deployed airbag 11. .

Instead of this configuration, in the configuration in which the airbag 11 and the inflator 12 are not housed in the case 13 and are embedded in the seat back 15, as shown in FIG. 11d from the position at which the sewn portion 11d can be sandwiched by the seat back 14 and the vehicle body component member 16 (see FIGS. 5 and 6) that enters the vehicle interior at the time of a side collision to the front portion of the airbag 11. You may make it extend so that it may continue.
According to this configuration, when the sewing portion 11d is sandwiched between the vehicle body constituting member 16 and the seat back 15 that enter the vehicle interior at the time of a side collision, the gas in the upper airbag chamber 11a and the lower airbag chamber 11b The flow is interrupted. Therefore, even if the lower airbag chamber 11b of the airbag 11 deployed at the time of a side collision is sandwiched between the substantially waist portion of the occupant P and the vehicle body component member 16 entering toward the vehicle interior, the interior of the lower airbag chamber 11b Is prevented from flowing into the upper airbag chamber 11a, so that an internal pressure difference between the upper airbag chamber 11a and the lower airbag chamber 11b can be secured and maintained. Early restraint can be achieved.

Further, as shown in FIGS. 1, 2, and 7, a third gas flow restriction for reducing the bag capacity of the airbag 11 is provided at a position where the airbag 11 in the deployed state and the side portion of the seatback 15 overlap each other. You may make it provide at least one sewing part 11e as a means.
According to this configuration, since the airbag capacity is reduced by the arrangement of the sewing portion 11e, the early deployment performance of the airbag 11 is improved. In addition, since the output of the inflator 12 can be reduced, it is possible to reduce harm to passengers who are not seated in the seat 14 in a normal state, that is, deterioration of OOP performance.

As shown in FIGS. 8 to 10, the sewing portion 11 c or the sewing portion 11 d and the sewing portion 11 e may be connected along the side portion of the seat back 15.
According to this configuration, the airbag capacity of the portion overlapping the seat back 15 that is not significantly involved in the passenger protection performance is greatly reduced. Therefore, the early deployment performance of the airbag 11 can be further improved and the output of the inflator 12 can be further reduced, so that the OOP performance deterioration can be greatly reduced.

Further, as shown in FIGS. 5 and 6, the height corresponding to the recessed portion 17 formed in the vehicle body component member 16 entering the sewing portion 11 c or the sewing portion 11 d toward the vehicle interior at the time of a side collision. As shown in FIGS. 1, 2 and 7, the upper and lower airbag chambers are close to the front end of the sewing portion 11c or the sewing portion 11d and face the concave portion 17 of the vehicle body constituting member 16, as shown in FIGS. You may make it have the exhaust holes 11f and 11g which discharge | emit the gas in 11a and 11b out of the airbag 11. FIG.
According to this configuration, the exhaust holes 11f and 11g are not blocked by the vehicle body constituting member 16 that enters the vehicle interior at the time of a side collision, and the gas discharged from the exhaust holes 11f and 11g is occupant. Since it is prevented that it blows out toward P, the protection reinforcement | strengthening of the passenger | crew P can be improved.

Moreover, as shown in FIG. 11, a cylindrical rectifying cloth 18 may be provided as gas rectifying means for diverting the gas generated by the inflator 12 toward the upper and lower airbag chambers 11 a and 11 b. .
According to this configuration, the gas generated by the inflator 12 is diverted toward the upper and lower airbag chambers 11a and 11b by the rectifying cloth 18, so that the internal pressure between the upper airbag chamber 11a and the lower airbag chamber 11b is reduced. The difference can be secured and maintained more efficiently, and the waist restraint of the occupant P can be accelerated.

In addition, as shown in FIG. 12A, the rectifying cloth 18 has different diameters at the top and bottom in order to adjust the amount of gas flowing into the upper airbag chamber 11a and the amount of gas flowing into the lower airbag chamber 11b. 12a or 12b, or provided with openings 18c on the upper and lower side walls of the rectifying cloth 18, as shown in FIG. 12 (b). It may be different.
According to this configuration, the amount of gas flowing into the upper airbag chamber 11a and the amount of gas flowing into the lower airbag chamber 11b are adjusted by the openings 18a to 18c of the rectifying cloth 18, so that the upper and lower airbag chambers The deployment speed and internal pressure corresponding to 11a and 11b can be easily obtained.

Further, as shown in FIGS. 13 and 14, the height position of the upper end portion of the airbag 11 in the deployed state and the upper end portion of the case 13 may be substantially matched.
According to such a configuration, since the upper airbag chamber 11a does not need to be deployed upward, the airbag configuration is simplified, and the upper airbag chamber 11a is easily deployed forward, thereby enhancing the protection of the occupant P. It can be achieved and the deployment of the upper airbag chamber 11a can be stabilized and accelerated.

Further, as shown in FIGS. 13 and 14, the height positions of the lower end portion of the airbag 11 in the deployed state and the lower end portion of the case 13 may be substantially matched.
According to this configuration, the lower airbag chamber 11a can be easily deployed toward the front, so that the protection of the occupant P can be enhanced and the deployment of the lower airbag chamber 11b can be stabilized and accelerated. it can.

Further, as shown in FIG. 15, the gas flows into the lower airbag chamber 11b in the vicinity of the gas outlet 12a of the inflator 12, and the gas flowing into the lower airbag chamber 11b flows from the lower airbag chamber 11b. You may make it provide the non-return valve 19 for preventing that it flows out.
According to this configuration, the gas flowing into the lower airbag chamber 11b is prevented from flowing out from the lower airbag chamber 11b by the check valve 19, so that the internal pressure between the upper airbag chamber 11a and the lower airbag chamber 11b is reduced. The difference can be easily secured and maintained, and the waist restraint of the occupant P can be accelerated.

Further, as shown in FIG. 16, between the upper airbag chamber 11a and the lower airbag chamber 11b, that is, in the sewing portion 11c or the sewing portion 11d, from the upper airbag chamber 11a to the lower airbag chamber 11b. It is also possible to provide a check valve 19 'for allowing only gas to flow.
According to such a configuration, since the gas flowing into the upper airbag chamber 11a flows only toward the lower airbag chamber 11b, the internal pressure difference between the upper airbag chamber 11a and the lower airbag chamber 11b is secured and maintained. It is possible to facilitate the occupant P's lower back restraint.

Further, as shown in FIGS. 17A and 17B, the check valves 19 and 19 ′ circulate the gas generated by the inflator 12, and are pushed by the pressure of the gas flowing into the lower airbag chamber 11b. You may make it have the variable flow-path part 20 which is crushed and interrupts | blocks a gas flow. This variable flow path portion 20 is obtained by stitching together one side portion and the other side portion along the gas flow direction in a state where the two base fabrics 21 and 21 having a truncated cone shape are overlapped, The cross-sectional area is configured to be zero in a static state (see FIG. 17A).
According to such a configuration, the gas flow is blocked by crushing both sides of the variable flow path portion 20 by the gas pressure in the lower airbag chamber 11b, so that the gas blocking performance is improved, and the upper airbag chamber 11a. As a result, the difference in internal pressure between the lower airbag chamber 11b and the lower airbag chamber 11b can be ensured and maintained more reliably, and the waist restraint of the occupant P can be accelerated.

Further, as shown in FIGS. 15 and 16, the end portions of the check valves 19 and 19 ′ may be positioned in the vicinity of the substantially central position in the lower airbag chamber 11b.
According to such a configuration, the gas cutoff performance of the check valves 19 and 19 ′ is further improved. Therefore, particularly when the airbag is deployed, the pressure in the lower airbag chamber 11b can be reliably secured and maintained, and the waist restraining performance of the occupant P can be improved.

  The side airbag device 10 is not provided only in the seat back 15, but may be provided in the vehicle body component member 16 such as a door trim or an armrest, for example.

Further, when the drag force at the time of deployment of the upper and lower airbag chambers 11a and 11b is insufficient, the shape of the airbag 11, the capacity of the upper and lower airbag chambers 11a and 11b, the shape of the sewing portions 11c and 11d, etc. It is preferable to adjust by changing.
Furthermore, the upper airbag chamber 11a is not limited to a configuration that only protects the abdomen from the substantially chest part of the occupant P, but is deployed so as to protect the abdomen from the substantially neck and head of the occupant P. You may comprise as follows.

It is a sectional side view for demonstrating the outline of this side airbag apparatus. It is the sectional side view which showed the modification of the 1st gas flow control means in the example. It is the perspective view which showed the airbag which inflate-deployed from the module case. It is the perspective view which showed the airbag pinched | interposed into the module case. It is the front view which showed the airbag expand | deployed between the vehicle body structural member and the passenger | crew. It is the front view which showed the airbag developed between the vehicle body structural member and the passenger | crew at the time of a side collision. It is the sectional side view which showed the 2nd modification of the 1st gas flow control means in the example. It is a modification of the side airbag apparatus in the example. It is a modification of the side airbag apparatus in the example. It is a modification of the side airbag apparatus in the example. It is the schematic for demonstrating a baffle cloth. (A), (b) is the schematic which showed the modification of the baffle cloth shown in FIG. It is a modification of the side airbag apparatus in the example. It is a modification of the side airbag apparatus in the example. It is a modification of the side airbag apparatus in the example. It is a modification of the side airbag apparatus in the example. (A), (b) is the schematic for demonstrating a non-return valve. It is a perspective view for demonstrating the outline of the conventional side airbag apparatus. It is a front view for demonstrating the conventional side airbag apparatus at the time of a side collision.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Side airbag apparatus 11 Airbag 11a Upper airbag chamber 11b Lower airbag chamber 11c Sewing part (1st gas flow control means)
11d Sewing part (second gas flow regulating means)
11e Sewing part (third gas flow regulating means)
12 Inflator (gas generator)
13 Case (Airbag module case)
13a Side part (opening / closing part)
14 Seat 15 Seat back 16 Car body component 17 Recess 18 Rectification cloth (gas rectification means)
19, 19 'Check valve

Claims (15)

An airbag that deploys so as to protect the substantially lower back from the substantially chest of the occupant, the airbag before deployment, and a gas generator that deploys the airbag are housed inside and opened by the airbag when deployed. In a side airbag device for a vehicle having a case having an opening / closing portion that is opened and a seat back incorporating the case,
The airbag divides the airbag into an upper airbag chamber that protects the abdomen from the substantially occupant's chest and a lower airbag chamber that protects the occupant's waist, and the upper and lower airbag chambers include the airbag. First gas flow restriction means for appropriately distributing the gas generated by the gas generator to generate a desired pressure difference, and the first gas flow restriction means can be sandwiched between the case and the opening / closing portion. A side airbag device for a vehicle, wherein the vehicle side airbag device extends from the position where the airbag is connected to the front portion of the airbag. A side airbag device for a vehicle, comprising: an airbag that is deployed so as to protect a substantially waist portion from a substantially chest portion of an occupant; and a seat back that includes the airbag before deployment and a gas generator that deploys the airbag. In
The airbag divides the airbag into an upper airbag chamber that protects the abdomen from the substantially occupant's chest and a lower airbag chamber that protects the occupant's waist, and the upper and lower airbag chambers include the airbag. A second gas flow restricting means for distributing a gas generated by the gas generating device to generate a desired pressure difference; the second gas flow restricting means is directed toward the vehicle interior when the seat back collides with the seat back; A side airbag device for a vehicle, characterized in that the vehicle side airbag device is extended from a position where it can be sandwiched by a vehicle body constituent member that enters the vehicle, and continues to the front portion of the airbag.   3. The vehicle side airbag device according to claim 1, wherein the first or second gas flow regulating means is a sewing portion that regulates inflation and deployment of the airbag.   The airbag has at least one third gas flow regulating means for reducing a bag capacity of the airbag at a position where the airbag in a deployed state and the seat back side portion overlap each other. The side airbag device for a vehicle according to claim 1, wherein the side airbag device is for a vehicle.   The vehicle side airbag device according to claim 4, wherein the third gas flow regulating means is a sewing portion that regulates inflation of the airbag.   5. The vehicle side air according to claim 4, wherein the first or second gas flow restriction means and the third gas flow restriction means are connected along the side portion of the seat back. Bag device.   The first or second gas flow restricting means is provided at a height position corresponding to a recess formed in a vehicle body constituting member that enters the vehicle interior when a side collision occurs. Alternatively, it has an exhaust hole for discharging gas in the upper and lower airbag chambers to the outside of the airbag near the front end of the second gas flow regulating means and facing the recess of the vehicle body constituting member. The vehicle side airbag device according to claim 1 or 2.   3. The vehicle side according to claim 1, wherein the airbag includes a gas rectifier that diverts the gas generated by the gas generator toward the upper and lower airbag chambers. Airbag device.   The said gas rectification | straightening means has an opening part for adjusting the gas amount which flows in the said gas into the said upper airbag chamber, and the gas amount which flows in into the said lower airbag chamber. Side airbag device for vehicles.   The side airbag device for a vehicle according to claim 1, wherein the height position of the upper end portion of the airbag in the deployed state and the upper end portion of the case is substantially matched.   The vehicle side airbag device according to claim 1 or 10, wherein height positions of a lower end portion of the airbag in a deployed state and a lower end portion of the case are substantially matched.   In order to prevent the gas flowing into the lower airbag chamber from flowing out from the lower airbag chamber, while allowing the gas to flow toward the lower airbag chamber in the vicinity of the gas blowing portion of the gas generator The side airbag device for a vehicle according to claim 1, wherein a check valve is provided.   2. A check valve that circulates the gas only from the upper airbag chamber toward the lower airbag chamber is provided between the upper airbag chamber and the lower airbag chamber. Or the side airbag apparatus of the vehicle of 2.   The check valve has a variable flow path portion that circulates the gas generated by the gas generator and is crushed by the pressure of the gas flowing into the upper or lower airbag chamber to block the gas flow. The vehicle side airbag device according to claim 12 or 13, wherein the vehicle side airbag device is provided.   The side airbag device for a vehicle according to claim 14, wherein an end portion of the check valve is located near a substantially central position in the lower airbag chamber.

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