JP2013177023A - Airbag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airbag advantageous in fully exhibiting a shock absorbing by ensuring the thickness of the whole airbag early.SOLUTION: An airbag 12 includes: a main chamber 18; two one-end-side sub chambers 20, 22 positioned ahead of the main chamber 18; and two other-end-side sub chambers 24, 26 positioned behind the main chamber 18. The main chamber 18 first swells and deploys by charging gas. The one-end-side first sub chamber 20 and the other-end-side first sub chamber 24 are positioned outside a vehicle cabin. The one-end-side second sub chamber 22 and the other-end-side second sub chamber 26 are positioned inside a vehicle cabin. Each of the main chamber 18 and the two one-end-side sub chambers 20, 22 is brought into communication by a one-end-side first opening 28 and a one-end-side second opening 30. Each of the main chamber 18 and the two other-end-side sub chambers 24, 26 is brought into communication by an other-end-side first opening 32 and an other-end-side second opening 34.

Description

  The present invention relates to an airbag.

There is an airbag that protects the occupant's head by inflating along the window of the side door of the vehicle by injecting gas. From the viewpoint of shock absorption, there is an airbag 2 in the direction connecting the vehicle interior and the vehicle exterior. Two rooms are arranged side by side.
For example, Patent Document 1 includes a first chamber that expands when a gas is introduced and a second chamber that expands when a gas in the first chamber is introduced, and the first chamber and the second chamber. Are separated by a breathable panel (see Patent Document 1).
According to the above prior art, since the second chamber is expanded by the gas that has permeated the breathable panel from the first chamber, the pressure fluctuation in each chamber becomes gentle.

Japanese Patent Laid-Open No. 2004-210257

However, in the above prior art, because the second chamber is expanded by the gas that has permeated through the breathable panel, gas is not sufficiently injected into the second chamber at the initial stage of gas injection, and the second chamber is not expanded. It is considered that the thickness of the entire airbag becomes insufficient because it becomes sufficient.
If the thickness of the entire airbag is insufficient at the initial stage of gas injection, a portion where the thickness cannot be secured occurs in the airbag, and there is a concern that the function of absorbing the impact on the head of the occupant is reduced.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airbag that is advantageous in sufficiently exhibiting an impact absorbing function by ensuring the thickness of the entire airbag at an early stage.

In order to achieve the above object, the invention according to claim 1 crosses the longitudinal direction of the airbag storage state by injecting gas from the injection port from the airbag storage state stored in an elongated shape in the passenger compartment. An airbag that is inflated and deployed in a first direction to be in a deployed state, and in the deployed state, a main chamber that is inflated by injecting gas into the inlet and in the deployed state, A plurality of one-end-side sub-chambers arranged adjacent to one end of the main chamber in a second direction intersecting the longitudinal direction and the first direction; and the main chamber and the plurality of one-end sides It is characterized by comprising a plurality of one end side openings that individually communicate with the sub chamber.
According to a second aspect of the present invention, the plurality of one-end-side sub chambers are two of one end-side first sub-chamber and one end-side second sub-chamber, and the plurality of openings are the main chamber and the one-end side. One end side first opening communicating with the first sub chamber, and one end side second opening communicating between the main chamber and the one end side second sub chamber, wherein the one end side first sub chamber is a vehicle compartment It is located outside, the one end side second subchamber is located on the vehicle interior side, and the area of the one end side first opening is larger than the area of the one end side second opening. .
According to a third aspect of the present invention, the plurality of one-end-side sub chambers are three of one end-side first sub-chamber, one end-side second sub-chamber, and one end-side third sub-chamber, and the plurality of openings are One end side first opening that communicates the main chamber and the one end side first sub chamber, one end side second opening that communicates the main chamber and the one end side second sub chamber, and the main chamber The one end-side third sub-chamber communicates with the one end-side third sub-chamber, and the one end-side second sub-chamber is located between the one end-side first sub-chamber and the one end-side third sub-chamber. And the area of the one end side first opening and the area of the one end side third opening are equal, and the area of the one end side second opening is larger than the area of the one end side first opening. To do.
The invention according to claim 4 is the plurality of other end sides partitioned from the main chamber and arranged in the second direction at a position of the main chamber located on the opposite side of the one end side sub chamber in the deployed state. The apparatus further comprises a sub chamber, and a plurality of other end side openings that individually communicate the main chamber and the plurality of other end side sub chambers.
According to a fifth aspect of the present invention, in the deployed state, the first outer cloth and the second outer cloth, which form the surface of the airbag so as to face each other, are spanned between the first outer cloth and the second outer cloth. The one end side main partition cloth that divides the space between the first outer cloth and the second outer cloth into the main chamber and the one end side sub chamber space, and the one end side main partition cloth from the first end cloth. One end side sub-partition cloth extending between the one outer side cloth and the second outer side cloth and partitioning the one end side sub chamber space into the one end side first sub chamber and the one end side second sub chamber is provided. The one end side first opening and the one end side second opening are formed in the one end side main partition cloth.
According to a sixth aspect of the present invention, in the deployed state, the first outer cloth and the second outer cloth that form the surface of the air bag opposite to each other, and the first outer cloth and the second outer cloth are stretched over. The one end side main partition cloth that divides the space between the first outer cloth and the second outer cloth into the main chamber and the one end side sub chamber space, and the one end side main partition cloth from the first end cloth. The one outer side cloth and the second outer cloth extend at a distance from each other, and the one end side sub chamber space is defined as the one end side first sub chamber, the one end side second sub chamber, and the one end side third. The first end side first opening portion, the one end side second opening portion, and the one end side third opening portion are formed in the one end side main partition cloth. It is characterized by.

According to the first aspect of the present invention, the gas that has flowed into the main chamber passes through the plurality of one-end-side openings in which the gas flow passage area is ensured and flows into the plurality of one-end-side subchambers. Since all of the side sub chambers are inflated at an early stage, the thickness of the entire airbag can be ensured at an early stage, which is advantageous in sufficiently exhibiting the shock absorbing function by the airbag.
Moreover, the internal pressure of the main chamber is greater than the internal pressure of the plurality of one-end side sub chambers.
Therefore, as the restraint force required for each part of the airbag, the restraint force of the occupant by the main chamber is the largest, and the restraint force of the occupant by the plurality of one-end side sub-chambers is required to be lower than that of the main chamber. This is advantageous when done.
According to the second aspect of the present invention, since the area of the one end side first opening is larger than the area of the one end side second opening, the main chamber, the one end side first sub chamber, and the one end side second sub chamber are arranged. The magnitude relationship between the internal pressures P1, P2, and P3 is P1>P2> P3.
Therefore, as the restraining force required corresponding to each part of the airbag, the restraining force of the occupant by the main chamber is the largest, and the restraining force of the occupant by the one end side first sub chamber and the one end side second sub chamber is the main chamber. This is advantageous when it is required to be lower.
In addition, since the one end side first sub chamber expands in a hard state and the one end side second sub chamber expands in a soft state, if the impact energy applied to the occupant is relatively small, the occupant is in the one end side second sub chamber. Being caught softly and restrained. Further, when the impact energy applied to the occupant is relatively large, the one-side first sub chamber is surely restrained.
Therefore, an appropriate restraining force corresponding to the magnitude of impact energy applied to the occupant can be obtained while relaxing the impact force applied to the occupant from the airbag.
According to the third aspect of the present invention, the magnitude relationship among the internal pressures P1, P2, P3, and P4 of the main chamber, the one end side first sub chamber, the one end side second sub chamber, and the one end side third sub chamber is P1> P3. > P2 = P4.
Therefore, the restraint force required for each part of the airbag is the largest for the passenger to be restrained by the main room, and the restraint force for the passenger by the three one-end side sub-chambers is required to be lower than that for the main room. This is advantageous when done.
In addition, since the one end side second sub chamber expands in a hard state, and the one end side first sub chamber and the one end side third sub chamber expand in a soft state, if the impact energy applied to the passenger is relatively small, The one end side first sub chamber and the one end side third sub chamber are softly received and restrained. Further, when the impact energy applied to the occupant is relatively large, the occupant is surely restrained in the second sub chamber on the one end side.
Therefore, an appropriate restraining force corresponding to the magnitude of impact energy applied to the occupant can be obtained while relaxing the impact force applied to the occupant from the airbag.
According to the fourth aspect of the present invention, the gas flowing into the main chamber passes through the plurality of one end side openings and the other end side openings in which the gas flow passage area is ensured and passes through the plurality of one end side sub-portions. And the other end side sub chamber and the other end side sub chamber are all inflated at an early stage, so that the thickness of the entire airbag can be secured at an early stage. This is advantageous for fully exhibiting the shock absorbing function.
Further, the internal pressure of the main chamber is larger than the internal pressures of the plurality of one end side sub chambers and the plurality of other end side sub chambers.
Therefore, the restraining force required for each part of the airbag is the largest restraining force of the occupant by the main chamber, and the restraining force of the occupant by the plurality of one end side sub chambers and the plurality of other end side sub chambers is the main restraining force. This is advantageous when it is required to be lower than the chamber.
According to the fifth aspect of the invention, the first outer cloth, the second outer cloth, the one end side main partition cloth, and the one end side sub partition cloth are used, and the one end side first opening portion and the one end side of the one end side main partition cloth are used. Since the airbag can be manufactured with a simple configuration of forming the second opening, the configuration can be simplified and the degree of freedom of design compared to the case of using a breathable panel that is restricted by the gas permeability. This is also advantageous for improving the quality.
According to the sixth aspect of the present invention, the first outer cloth, the second outer cloth, the one end side main partition cloth, the two one end side sub partition cloths are used, and the one end side first opening is formed in the one end side main partition cloth. Since the airbag can be manufactured with a simple configuration of forming the one end-side second opening and the one end-side third opening, it is configured compared to the case of using a breathable panel that is restricted by the gas permeability. This is advantageous for improving the degree of freedom of design.

It is explanatory drawing which shows the accommodation state of the airbag in 1st Embodiment. It is explanatory drawing which shows the deployment state of the airbag in 1st Embodiment. It is explanatory drawing which shows the structure of the airbag in 1st Embodiment, and is the perspective view which looked at the AA line cross section of FIG. 2 from upper direction and back. It is explanatory drawing which shows the deployment state of the airbag in 2nd Embodiment. It is explanatory drawing which shows the structure of the airbag in 2nd Embodiment, and is the perspective view which looked at the AA sectional view of FIG. 4 from upper direction and back. It is explanatory drawing which shows the structure of the airbag in 3rd Embodiment, and is a perspective view similar to FIG. It is explanatory drawing which shows the structure of the airbag in 4th Embodiment, and is a perspective view similar to FIG. It is explanatory drawing which shows the structure of the airbag in 5th Embodiment, and is a perspective view similar to FIG.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case will be described in which the airbag is a curtain airbag that is deployed in a planar shape to the side of the occupant to protect the occupant when subjected to an impact such as a side collision.
As shown in FIG. 1, the front door 2 is located on the side of the front seat in the vehicle interior, and a roof side rail 4 is formed to extend along the front-rear direction of the vehicle above the front door 2. A symbol W indicates a window of the front door 2.
An airbag device 10 is provided on a roof side portion 6 surrounded by the roof side rail 4 and a head lining (not shown).
The airbag device 10 includes an airbag 12A (FIG. 2) according to the present invention, an inflator (not shown), and a sleeve 14.
The airbag 12 </ b> A is elongated in the roof side portion 6, extends in the front-rear direction of the vehicle, and is stored in the sleeve 14. A plurality of attachment pieces 1202 project from the edge of the airbag 12A, and these attachment pieces 1202 are attached to the roof side rail 4 via brackets (not shown). A tether belt 1204 projects from the front end of the airbag 12A, and the tether belt 1204 is attached to the front pillar.
The inflator operates when a vehicle collides, rolls over, and supplies gas to an inlet (not shown) of the airbag 12A.
The sleeve 14 is a cylindrical covering member that covers the folded airbag 12A and maintains its shape, and the airbag 12A is covered with the sleeve 14 and is in a housed state. The sleeve 14 is configured to be easily broken by the inflation and deployment of the airbag 12A. The sleeve 14 is attached to the roof side rail 4 via a bracket.

The air bag 12A is inflated by injecting the gas ejected from the inflator through the injection path 16 from the injection port into the inside thereof, and quickly protrudes downward from the roof side portion 6 while breaking the sleeve 14. Then, it expands and develops downward along the window, and the expanded state shown in FIG. 2 is obtained.
In the present embodiment, the longitudinal direction of the airbag storage state is the longitudinal direction of the vehicle, and the first direction intersecting the longitudinal direction (the direction in which the airbag 12A is inflated and deployed) is the vertical direction, The second direction (the direction in which the plurality of one-end side sub-chambers are arranged and the direction in which the plurality of the other-end side sub-chambers are arranged) is the vehicle width direction.

As shown in FIG. 3, in the deployed state, the airbag 12A is in the second direction adjacent to one end of the main chamber 18 in the longitudinal direction and the main chamber 18 in the longitudinal direction of the airbag storage state. A plurality of one-side sub-chambers 20 and 22 arranged in a row and a main chamber 18 located on the opposite side of the one-end side sub-chambers 20 and 22 are partitioned from the main chamber 18 and arranged in the second direction. The other end side sub chambers 24 and 26 are provided.
In addition, the airbag 12A includes a plurality of one end openings 28 and 30 that individually communicate the main chamber 18 and the plurality of one end side sub chambers 20 and 22, respectively, and the main chamber 18 and the plurality of other end side sub chambers 24. , 26 are respectively provided with a plurality of openings 32, 34 on the other end side that communicate with each other individually.
In the present embodiment, the plurality of one end side sub chambers 20 and 22 are two, one end side first sub chamber 20 and one end side second sub chamber 22, and the other end side sub chambers 24 and 26 are The other end side first sub chamber 24 and the other end side second sub chamber 26.
The plurality of one end side openings 28 and 30 are two, one end side first opening 28 and one end side second opening 30, and the other end side openings 32 and 34 are the other end side first openings 28 and 30. One opening 32 and the other end-side second opening 34.

The main chamber 18 is provided in communication with the injection path 16, and the main chamber 18 is in communication with the injection port via the injection path 16.
Therefore, the main chamber 18 bulges and expands first when gas is injected.

The one end-side first sub-chamber 20 and the one end-side second sub-chamber 22 are provided adjacent to the front end of the main compartment 18 in the deployed state, and are arranged in a direction connecting the vehicle interior and the exterior of the vehicle compartment. It has been.
The one end side first sub chamber 20 is located outside the vehicle compartment, and the one end side second sub chamber 22 is located inside the vehicle compartment.
And the one end side 1st opening part 28 which connects the main chamber 18 and the one end side 1st subchamber 20 and the one end side 2nd opening part 30 which connects the main chamber 18 and the one end side 2nd subchamber 22 are provided. Is provided.
The area of the one end side first opening 28 is larger than the area of the one end side second opening 30.

The other end-side first sub-chamber 24 and the other end-side second sub-chamber 26 are in a deployed state at a location of the main chamber 18 located opposite to the one-end-side first sub-chamber 20 and the one-end-side second sub-chamber 22. Provided, that is, adjacent to the rear end portion of the passenger compartment of the main compartment 18 and arranged in a direction connecting the passenger compartment and the exterior of the passenger compartment.
The other end side first sub chamber 24 is located outside the vehicle compartment, and the other end side second sub chamber 26 is located inside the vehicle compartment.
And the other end side 1st opening part 32 which connects the main chamber 18 and the other end side 1st subchamber 24, and the other end side 2nd opening which connects the main chamber 18 and the other end side 2nd subchamber 26 Part 34 is provided.
The area of the other end side first opening 32 is larger than the area of the other end side second opening 34.

More specifically, as shown in FIG. 3, the airbag 12 </ b> A includes a first outer cloth 36, a second outer cloth 38, one end side main partition cloth 40, one end side sub partition cloth 42, and the other end side main partition cloth. 44, the other end side sub-partition cloth 46 is provided.
As the first outer cloth 36, the second outer cloth 38, one end side main partition cloth 40, one end side sub partition cloth 42, the other end side main partition cloth 44, and the other end side sub partition cloth 46, nylon thread and polyester thread are used. Various conventionally known materials such as the woven fabric used can be used.

  The first outer cloth 36 is located in the entire region outside the passenger compartment of the airbag 12A in the deployed state, and the second outer cloth 38 is located in the entire region inside the passenger compartment of the airbag 12A in the deployed state. The first outer cloth 36 and the second outer cloth 38 face each other to form the surface of the airbag 12A.

In the deployed state, the one end side main partition cloth 40 is a space between the first outer cloth 36 and the second outer cloth 38 near the front portion of the airbag 12A. And 2 minutes. That is, the one end side main partition cloth 40 is located near the front part of the airbag 12A, and the outer edge between the first outer cloth 36 and the second outer cloth 38 is the first outer cloth 36 and the second outer cloth 38. And are extended obliquely in the vertical direction.
The one end side sub partition cloth 42 divides the one end side sub chamber space 20 </ b> A into one end side first sub chamber 20 and one end side second sub chamber 22 arranged in the vehicle width direction. That is, the one end side sub-partition cloth 42 extends from the intermediate portion in the width direction of the one end side main partition cloth 40 to the front of the vehicle compartment between the first outer cloth 36 and the second outer cloth 38, and the one end side sub partition cloth 42. The outer edge of the cloth 42 is stitched to the mating surface of the first outer cloth 36 and the second outer cloth 38.
The one end side first sub chamber 20 is formed of a first outer cloth 36, one end side main partition cloth 40, and one end side sub partition cloth 42.
The one end side second sub chamber 22 is formed of a second outer cloth 38, one end side main partition cloth 40, and one end side sub partition cloth 42.
The one end side first opening 28 and the one end side second opening 30 are formed in the one end side main partition cloth 40.

In the deployed state, the other end side main partition cloth 44 is a space between the first outer cloth 36 and the second outer cloth 38 at a position near the rear part of the airbag 12A, and the space for the main chamber 18 and the other end side sub chamber. 2 minutes to 24A. That is, the other end side main partition cloth 44 is located near the rear part of the airbag 12A, and the outer edge between the first outer cloth 36 and the second outer cloth 38 is the first outer cloth 36 and the second outer cloth 38. And extend obliquely with respect to the vertical direction.
In the present embodiment, as shown in FIG. 2, the upper part of the other end-side main partition cloth 44 is a lateral part 48 extending rearward through a bent part, and the lateral part 48 and the first outer cloth 36. And the second outer cloth 38 form an injection path 16 communicating with the main chamber 18.
The other end side sub partition cloth 46 divides the other end side sub chamber space 24 </ b> A into the other end side first sub chamber 24 and the other end side second sub chamber 26 arranged in the vehicle width direction. In other words, the other end side sub-partition cloth 46 extends rearward from the intermediate portion in the width direction of the other end side main partition cloth 44 between the first outer cloth 36 and the second outer cloth 38 and the other end. The outer edge of the side auxiliary partition cloth 46 is stitched to the other end side main partition cloth 44 and the mating surface of the first outer cloth 36 and the second outer cloth 38.
The main chamber 18 is formed of a first outer cloth 36, a second outer cloth 38, one end side main partition cloth 40, and the other end side main partition cloth 44.
The other end side first sub chamber 24 is formed by a first outer cloth 36, the other end side main partition cloth 44, and the other end side sub partition cloth 46.
The other end side second sub chamber 26 is formed of a second outer cloth 38, the other end side main partition cloth 44, and the other end side sub partition cloth 46.
The other end side first opening 32 and the other end side second opening 34 are formed in the other end side main partition cloth 44.

Next, the function and effect of the first embodiment will be described.
When the inflator is activated and the gas is supplied from the inlet to the injection path 16 in the event of a vehicle collision or rollover, the gas first flows into the main chamber 18, and then the one end side openings 28, 30, etc. It flows into the one end side sub chambers 20 and 22 and the other end side sub chambers 24 and 26 through the end openings 32 and 34, respectively.
The gas that has flowed into the main chamber 18 passes through the one end side openings 28 and 30 and the other end side openings 32 and 34 in which the gas flow passage area is secured, and then passes through the one end side sub chambers 20 and 22 and the other end side sub chamber. Since the air flows into the chambers 24 and 26, the one end side sub-chambers 20 and 22 and the other end side sub-chambers 24 and 26 all inflate at an early stage, so that the thickness of the entire airbag 12A can be secured at an early stage.
Therefore, it is advantageous in sufficiently exhibiting the shock absorbing function by the airbag 12A.

Further, when the inflow of gas from the inflator to the airbag 12A is started, the internal pressure P1 of the main chamber 18 into which the gas first flows becomes the highest, and then the one end side sub chambers 20 and 22 into which the gas flows in, the other end side. The internal pressures P2 to P5 of the sub chambers 24 and 26 are lower than the internal pressure P1 of the main chamber 18, and as will be described below, the main chamber 18, the one end side sub chambers 20, 22, and the other end side sub chambers 24, 26. An internal pressure difference occurs between
This internal pressure difference occurs during the period in which gas flows from the inflator to the airbag 12A. Eventually, the internal pressures P1 to P5 and the inflator in the main chamber 18, the one end side sub chambers 20, 22, and the other end side sub chambers 24, 26 are inflated. The internal pressure difference becomes zero when the inflow of gas from the inflator to the airbag 12A stops.
Actually, the timing at which the airbag 12A receives the occupant is a period during which gas flows into the airbag 12A from the inflator. Therefore, the airbag 12A has the main chamber 18, the one-end side sub-chambers 20, 22, and the like. The occupant is received in a state where the internal pressure difference between the end side sub chambers 24 and 26 is generated.

Since the area of the one end side first opening portion 28 is larger than the area of the one end side second opening portion 30, the one end side first opening portion 28 is introduced from the main chamber 18 into the one end side first sub chamber 20 through the one end side first opening portion 28. The flow rate of the gas is greater than the flow rate of the gas introduced from the main chamber 18 to the one end side second sub chamber 22 through the one end side second opening 30.
Accordingly, the internal pressure P2 in the one end-side first sub chamber 20 is higher than the internal pressure P3 in the one end side second sub chamber 22.
Further, since the area of the other end side first opening 32 is larger than the area of the other end side second opening 34, the other end side first sub-portion from the main chamber 18 through the other end side first opening 32. The flow rate of the gas introduced into the chamber 24 is greater than the flow rate of the gas introduced from the main chamber 18 into the other end side second sub chamber 26 via the other end side second opening 34.
Accordingly, the internal pressure P4 of the other end side first sub chamber 24 is higher than the internal pressure P5 of the other end side second sub chamber 26.
The magnitude relationship of the internal pressures of the main chamber 18, the one end side sub chambers 20, 22, and the other end side sub chambers 24, 26 is as follows.
P1>P2> P3, P1>P4> P5

Therefore, the impact energy of the occupant that can be received by the main chamber 18 is the largest, and the impact energy of the occupant that can be received by the one-end side sub-chambers 20 and 22 and the other-end side sub-chambers 24 and 26 is lower than that of the main chamber 18. It will be a thing.
In other words, the occupant's restraining force by the main chamber 18 is the largest, and the occupant's restraining force by the one end side sub chambers 20, 22 and the other end side sub chambers 24, 26 is lower than that of the main chamber 18.

The restraint force required for each part of the airbag 12A is set in consideration of the physique of the occupant, the seating position in the front-rear direction, the collision position and the collision direction when another vehicle collides with the host vehicle, and the like. . Therefore, it is important to appropriately set the restraining force of each chamber according to the magnitude of the restraining force required for each part of the airbag 12A.
In the present embodiment, the restraining force by the main chamber 18 located at the intermediate portion in the extending direction of the airbag 12A is the highest, and the first end located at the front portion that is one of the extending directions of the airbag 12A. Due to the restraining force of the one sub chamber 20 and the second sub chamber 22 on the one end side, and the other end side first sub chamber 24 and the other end side second sub chamber 26 located at the rear, which is the other side in the extending direction of the airbag 12A. This is advantageous when the restraining force is required to be lower than the restraining force of the main chamber 18.
In addition, the area of the one end side 1st opening part 28, the one end side 2nd opening part 30, the other end side 1st opening part 32, and the other end side 2nd opening part 34 is restraint requested | required for every site | part of the airbag 12A. It is set appropriately according to the force.

Further, in the present embodiment, the internal pressure P3 of the one end side second sub chamber 22 on the vehicle interior side is set lower than the internal pressure P2 of the one end side first sub chamber 20 on the outside of the vehicle interior, so the one end side first sub chamber 20 expands in a hard state, and the one end side second sub chamber 22 expands in a soft state.
Further, since the internal pressure P5 of the other end side second sub chamber 26 on the vehicle interior side is set lower than the internal pressure P4 of the other end side first sub chamber 24 outside the vehicle interior, the other end side first sub chamber 24 is hard. The second sub chamber 26 on the other end side expands in a soft state.
Therefore, when the impact energy applied to the occupant is relatively small, the occupant is softly received and restrained by the one end side second sub chamber 22 or the other end side second sub chamber 26.
Further, when the impact energy applied to the occupant is relatively large, the impact energy is surely restrained in the first sub chamber 20 on the one end side or the first sub chamber 24 on the other end side.
Therefore, an appropriate restraining force corresponding to the magnitude of the impact energy applied to the occupant can be obtained while relaxing the impact force applied to the occupant from the airbag 12A.
Further, during the period in which gas flows from the inflator to the airbag 12A, the internal pressures P2 and P4 in the compartment outside the vehicle compartment (the first side first subchamber 20 and the other end side first subchamber 24) are on the vehicle interior side. This is higher than the internal pressures P3 and P5 of the first chamber (the second sub chamber 22 on the one end side and the second sub chamber 26 on the other end side), which is advantageous in increasing the deployment speed of the airbag 12A.

Further, in the present embodiment, the first outer cloth 36, the second outer cloth 38, the one end side main partition cloth 40, the one end side sub partition cloth 42, the other end side main partition cloth 44, and the other end side sub partition cloth 46 are provided. In addition, one end side first opening 28 and one end side second opening 30 are formed in the one end side main partition cloth 40, and the other end side first opening 32 is formed in the other end side main partition cloth 44. Since the airbag 12A can be manufactured with a simple configuration in which two openings 34 are formed, the configuration can be simplified and the design freedom can be achieved as compared with the case of using a breathable panel that is restricted by the gas permeability. This is also advantageous in improving the degree.
In the embodiment, the area of the first opening 28 on the one end side is larger than the area of the second opening 30 on the one end side, and the area of the first opening 32 on the other end side is the area of the second opening 34 on the other end side. Although the case where the area is larger than the area has been described, the areas of the openings may be equal, or the area of the first opening 28 on the one end side may be smaller than the area of the second opening 30 on the one end. The area of the end-side first opening 32 may be smaller than the area of the other-end-side second opening 34. In those cases, the internal pressure P1 of the main chamber 18 is larger than the internal pressures P2 and P3 of the two one-end side sub-chambers 20 and 22, and larger than the internal pressures P4 and P5 of the two other-end side sub-chambers 24 and 26. For this reason, as the restraining force required corresponding to each part of the airbag, the restraining force of the occupant in the main chamber 18 is the largest, and the two one end side sub chambers 20 and 22 or the two other end side sub chambers 24 and 26 are provided. This is advantageous when it is required that the restraining force of the occupant be lower than that of the main chamber 18.

(Second Embodiment)
Next, a second embodiment will be described. In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be simplified.
As shown in FIGS. 4 and 5, in the second embodiment, in the deployed state, the airbag 12 </ b> B has three chambers: a main chamber 18, a first end first sub chamber 20, and a first end second sub chamber 22. This is different from the first embodiment. That is, in the second embodiment, the other end side first sub chamber 24 and the other end side second sub chamber 26 are removed from the first embodiment.
The main chamber 18 is provided in communication with the injection path 16.
The one end side first sub chamber 20 and the one end side second sub chamber 22 are located in front of the main chamber 18.
The one end side first sub chamber 20 is located outside the vehicle compartment, the one end side second sub chamber 22 is located inside the vehicle compartment, and the area of the one end side first opening 28 is the area of the one end side second opening 30. Bigger than.

The first outer cloth 36 is located in the entire region outside the passenger compartment of the airbag 12B in the deployed state, and the second outer cloth 38 is located in the entire region inside the passenger compartment of the airbag 12B in the deployed state.
In the deployed state, the one end side main partition cloth 40 has a space between the first outer cloth 36 and the second outer cloth 38 at the front and rear intermediate portions of the airbag 12B as the main chamber 18 and the one end side sub chamber space 20A. The one end side main partition cloth 40 is sewn to the first outer cloth 36 and the second outer cloth 38, and extends in the diagonally up and down direction.
The one-end-side sub-partition cloth 42 divides the one-end-side sub-chamber space 20 </ b> A into the one-end-side first sub-chamber 20 and the one-end-side second sub-chamber 22. The one end side sub-partition cloth 42 extends forward from the middle portion in the width direction of the one end side main partition cloth 40 between the first outer cloth 36 and the second outer cloth 38, and the one end side sub partition cloth 42. The outer edge is stitched to one end side main partition cloth 40 and the mating surface of the first outer cloth 36 and the second outer cloth 38.
The one end side first opening 28 and the one end side second opening 30 are formed in the one end side main partition cloth 40.

Next, the function and effect of the second embodiment will be described.
In the event of a vehicle collision or rollover, when the inflator is activated and gas is supplied from the inlet to the injection path 16, the gas first flows into the main chamber 18, and then the one end side first opening 28, one end. It flows into the one end side first sub chamber 20 and the one end side second sub chamber 22 through the side second opening 30.
The gas that has flowed into the main chamber 18 passes through the one end-side first opening 28 and the one end-side second opening 30 where the gas passage area is ensured, and then the one end-side first sub-chamber 20 and the one end-side second sub-portion. Since it flows into the chamber 22, the main chamber 18, the one end side first sub chamber 20, and the one end side second sub chamber 22 are all inflated at an early stage, so that the thickness of the entire airbag 12 </ b> B can be secured at an early stage. .
Therefore, it is advantageous to sufficiently exhibit the shock absorbing function by the airbag 12B.

  Further, when the inflow of gas from the inflator to the airbag 12B is started, the internal pressure P1 of the main chamber 18 into which the gas first flows in becomes the highest pressure, and then the one end side first sub chamber 20 into which the gas flows in, The internal pressures P2 and P3 of the two sub chambers 22 are lower than the internal pressure P1 of the main chamber 18, and as described below, the main chamber 18, the one end side first sub chamber 20, and the one end side second sub chamber 22 An internal pressure difference occurs between them.

Since the area of the one end side first opening portion 28 is larger than the area of the one end side second opening portion 30, the one end side first opening portion 28 is introduced from the main chamber 18 into the one end side first sub chamber 20 through the one end side first opening portion 28. The flow rate of the gas is greater than the flow rate of the gas introduced from the main chamber 18 to the one end side second sub chamber 22 through the one end side second opening 30.
Accordingly, the internal pressure P2 in the one end-side first sub chamber 20 is higher than the internal pressure P3 in the one end side second sub chamber 22.
The magnitude relationships among the internal pressures P1, P2, and P3 of the main chamber 18, the one end side first sub chamber 20, and the one end side second sub chamber 22 are as follows.
P1>P2> P3

Therefore, the impact energy of the occupant that can be received by the main chamber 18 is the largest, and the impact energy of the occupant that can be received by the one end side first sub chamber 20 and the one end side second sub chamber 22 is lower than that of the main chamber 18. It becomes.
In other words, the occupant restraining force by the main chamber 18 is the largest, and the occupant restraining force by the one end side first sub chamber 20 and the one end side second sub chamber 22 is lower than that of the main chamber 18.
In the present embodiment, the restraining force by the main chamber 18 located at the rear portion of the airbag 12B is the highest, and the one end side first sub chamber 20 and the one end side second sub chamber 22 located at the front portion of the airbag 12B. This is advantageous when it is required that the restraining force by is lower than the restraining force by the main chamber 18.
In addition, the area of the one end side 1st opening part 28 and the one end side 2nd opening part 30 is suitably set according to the binding force requested | required for every site | part of the airbag 12B.

Further, in the second embodiment, the internal pressure P3 of the one end side second subchamber 22 on the vehicle interior side is set lower than the internal pressure P2 of the one end side first subchamber 20 on the outside of the vehicle compartment, so that the first end side first The sub chamber 20 expands in a hard state, and the one end side second sub chamber 22 expands in a soft state.
Therefore, when the impact energy applied to the occupant is relatively small, the occupant is softly received and restrained by the second sub chamber 22 on the one end side.
In addition, when the impact energy applied to the occupant is relatively large, the one-side first sub chamber 20 is surely restrained.
Therefore, an appropriate restraining force corresponding to the magnitude of the impact energy applied to the occupant can be obtained while alleviating the impact force applied to the occupant from the airbag 12B.
Further, during the period in which gas flows from the inflator to the airbag 12B, the internal pressure P2 of the chamber outside the vehicle interior (one end side first sub chamber 20) is the vehicle interior side chamber (one end side second sub chamber 22). Therefore, it is advantageous in increasing the deployment speed of the airbag 12B.

In the second embodiment, the first outer cloth 36, the second outer cloth 38, the one-end side main partition cloth 40, and the one-end side sub-partition cloth 42 are used, and the one-end-side main partition cloth 40 is connected to the one-end side first partition cloth 40. Since the airbag 12B can be manufactured with a simple configuration in which the opening 28 and the second opening 30 on the one end side are formed, the configuration is simple compared to the case of using a breathable panel that is restricted by the gas permeability. This is advantageous for improving the degree of freedom of design.
In the embodiment, the case where the area of the first opening 28 on the one end side is made larger than the area of the second opening 30 on the one end side may be equal. The area of the one end side first opening 28 may be smaller than the area of the one end side second opening 30. In those cases, the internal pressure P1 of the main chamber 18 is larger than the internal pressures P2 and P3 of the two one-end side sub-chambers 20 and 22, and therefore, as a binding force required corresponding to each part of the airbag, This is advantageous when the occupant restraining force by the chamber 18 is the largest and it is required to make the occupant restraining force by the two one-end side sub-chambers 20 and 22 lower than that of the main chamber 18.

(Third embodiment)
Next, a third embodiment will be described.
The third embodiment is a modification of the first embodiment, and differs from the first embodiment in that three one-end side sub chambers and three other end-side sub chambers are provided. ing.
As shown in FIG. 6, in the third embodiment, in the deployed state, the airbag 12C has a main chamber 18 located at the center in the longitudinal direction in the airbag storage state, and one end of the main chamber 18 in the longitudinal direction. Partitioned from the main chamber 18 at three adjacent one-end side sub-chambers 20, 22, 23 arranged in the second direction and the main chamber 18 located on the opposite side of the one-end sub-chambers 20, 22, 23. The other end side sub-chambers 24, 26, and 27 are arranged in the second direction.
In addition, the airbag 12C includes three one-end openings 28, 30, 31 that individually communicate with the main chamber 18 and the three one-end sub-chambers 20, 22, 23, and the main chamber 18 and three other ends. Three other opening portions 32, 34, and 35 that individually communicate with the side sub chambers 24, 26, and 27 are provided.

The main chamber 18 is provided in communication with the injection path 16, and the main chamber 18 bulges and expands first when gas is injected.
The three one-end-side sub chambers 20, 22, and 23 are the one-end-side first sub-chamber 20, the one-end-side second sub-chamber 22, and the one-end-side third sub-chamber 23, and the three one-end-side openings 28, 30, and 31. Are one end side first opening 28, one end side second opening 30, and one end side third opening 31.
The other end side sub chambers 24, 26, and 27 are the other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27. The openings 32, 34, and 35 are the other end-side first opening 32, the other end-side second opening 34, and the other end-side third opening 35.

The one end side first sub chamber 20, the one end side second sub chamber 22, and the one end side third sub chamber 23 are provided adjacent to the front end of the main chamber 18 in the unfolded state. They are arranged in the direction connecting the outside of the passenger compartment.
The one end side first sub chamber 20 is located outside the vehicle compartment, the one end side third sub chamber 23 is located on the vehicle interior side, and the one end side second sub chamber 22 is connected to the one end side first sub chamber 20 and one end. It is located between the side third sub chamber 23.
The one end side first opening portion 28 communicates the main chamber 18 and the one end side first sub chamber 20, and the one end side second opening portion 30 communicates the main chamber 18 and the one end side second sub chamber 22, The one end side third opening 31 communicates the main chamber 18 and the one end side third sub chamber 23.
The area of the one end side first opening portion 28 is equal to the area of the one end side third opening portion 31, and the area of the one end side second opening portion 30 is larger than the area of the one end side first opening portion 28.

The other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27 are provided adjacent to the rear end of the main compartment 18, and It is arranged in the direction connecting the outdoor.
The other end side first sub chamber 24 is located outside the vehicle compartment, the other end side third sub chamber 27 is located inside the vehicle compartment, and the other end side second sub chamber 26 is the other end side first sub chamber. It is located between the chamber 20 and the third sub chamber 27 on the other end side.
The other end side first opening 32 communicates the main chamber 18 and the other end side first sub chamber 24, and the other end side second opening 34 communicates with the main chamber 18 and the other end side second sub chamber 26. The other end side third opening 35 communicates the main chamber 18 and the other end side third sub chamber 27.
The area of the other end side first opening 32 and the area of the other end side third opening 35 are equal, and the area of the other end side second opening 34 is larger than the area of the other end side first opening 32.

More specifically, as shown in FIG. 6, the airbag 12 </ b> C includes a first outer cloth 36, a second outer cloth 38, one end side main partition cloth 40, two one end side sub partition cloths 42, and the other end side. A main partition cloth 44 and two other-side sub partition cloths 46 are provided.
In the deployed state of the airbag 12C, the space located inside the first outer cloth 36 and the second outer cloth 38 is one end side located forward by the one end main partition cloth 40 and the other end main partition cloth 44. The sub-chamber space 20A, the main chamber 18 located behind the sub-chamber space 20A, and the other-end side sub-chamber space 24A located behind the sub-chamber space 20A are divided into three.

The two one-end-side sub-partition cloths 42 extend forward of the vehicle compartment between the first outer cloth 36 and the second outer-cloth 38 from a portion spaced in the vehicle width direction of the one-end main partition cloth 40. The outer edge of each one-end-side sub-partition cloth 42 is stitched to the mating surface of the first outer cloth 36 and the second outer cloth 38.
Accordingly, the one end side sub chamber space 20A is arranged inward from the outer side in the vehicle width direction by the two end side sub partition cloths 42, one end side first sub chamber 20, one end side second sub chamber 22, one end side. The third sub chamber 23 is partitioned into three one-end side sub chambers.
The one end side first opening 28, the one end side second opening 30, and the one end side third opening 31 are formed in the one end side main partition cloth 40.

Further, the two other end side sub-partition cloths 46 are located in the rear of the vehicle compartment between the first outer cloth 36 and the second outer cloth 38 from a position spaced in the vehicle width direction of the other end side main partition cloth 44. The outer edge of each other-end-side sub-partition cloth 44 is stitched to the mating surface of the first outer cloth 36 and the second outer cloth 38 and the lateral portion 48.
Accordingly, the other end side sub chamber space 24A is arranged by the other end side sub partition cloth 46 so that the other end side first sub chamber 24 and the other end side second sub chamber are arranged inward from the outer side in the vehicle width direction. 26, the other end side sub chamber 27 is partitioned into three other end side sub chambers.
The other end side first opening 32, the other end side second opening 34, and the other end side third opening 35 are formed in the other end side main partition cloth 44.

Next, the function and effect of the third embodiment will be described.
In the event of a vehicle collision or rollover, when the inflator is activated and gas is supplied from the inlet to the injection path 16, the gas first flows into the main chamber 18, and then the three one-end openings 28, 30. , 31, and the three other end side sub chambers 20, 22, 23, and the other end side sub chambers 24, 26, 27 through the three other end side openings 32, 34, 35, respectively.
Since the three one-end openings 28, 30, 31 and the three other-end openings 32, 34, 35 have a gas flow passage area, the three one-end sub chambers 20, 22, 23 and Since all of the three other-end-side sub chambers 24, 26, and 27 are inflated at an early stage, the thickness of the entire airbag 12C can be secured at an early stage.
Therefore, it is advantageous to sufficiently exhibit the shock absorbing function by the airbag 12C.

Further, when the inflow of gas from the inflator to the airbag 12C is started, the internal pressure P1 of the main chamber 18 into which the gas first flows becomes the highest pressure, and then the one end side first sub chamber 20 into which the gas flows in, the one end side first The internal pressures P2 to P7 of the two sub chambers 22, the one end side third sub chamber 23, the other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27 are the internal pressures of the main chamber 18. The pressure is lower than that of P1, and an internal pressure difference is generated between the main chamber 18 and the three one end side sub chambers 20, 22, 23, and the three other end side sub chambers 24, 26, 27.
This internal pressure difference occurs during a period in which gas flows from the inflator to the airbag 12C. Eventually, the main chamber 18, the three one end side sub chambers 20, 22, 23, the three other end side sub chambers 24, When the internal pressures P1 to P7 of 26 and 27 are balanced with the pressure of the inflator and the inflow of gas from the inflator to the airbag 12C stops, the internal pressure difference becomes zero.
Actually, the timing at which the airbag 12C receives the occupant is a period in which gas flows into the airbag 12C from the inflator. Therefore, the airbag 12C includes the main chamber 18, the three one-end side sub chambers 20, The occupant is received in a state in which an internal pressure difference is generated between the second end chambers 24, 26, and 27.

Since the area of the one end side second opening 30 is larger than the areas of the one end side first opening 28 and the one end side third opening 31, the gas introduced from the main chamber 18 into the one end side second sub chamber 22 The flow rate is higher than the flow rate of the gas introduced from the main chamber 18 into the one end side first sub chamber 20 and the one end side third sub chamber 23.
Therefore, the internal pressure P3 in the one end-side second sub chamber 22 is higher than the internal pressures P2, P4 in the one end side first sub chamber 20 and the one end side third sub chamber 23.
Further, the area of the second opening 34 on the other end side is larger than the areas of the first opening 32 on the other end side and the third opening 35 on the other end side. The flow rate of the gas introduced into the main chamber 18 is larger than the flow rate of the gas introduced from the main chamber 18 into the other end side first sub chamber 24 and the other end side third sub chamber 27.
Therefore, the internal pressure P6 of the other end side second sub chamber 26 is higher than the internal pressures P5 and P7 of the other end side first sub chamber 24 and the other end side third sub chamber 27.
The magnitude relationship between these internal pressures is as follows.
P1>P3> P2 = P4, P1>P6> P5 = P7

Accordingly, the impact energy of the occupant that can be received by the main chamber 18 is the largest, and the impact energy of the occupant that can be received by the three one-end side sub-chambers 20, 22, 23, and the three other-end side sub-chambers 24, 26. , 27, the impact energy of the occupant that can be received by the passengers 27 is lower than that of the main chamber 18.
In other words, the occupant's restraining force by the main chamber 18 is the largest, and the occupant's restraining force by the three one-end side sub-chambers 20, 22 and 23 and the occupant's restraining force by the three other-end side sub-chambers 24, 26 and 27. Is lower than the main room 18.
Therefore, it is advantageous when the restraining force at the front and rear portions of the airbag 12C is required to be lower than the restraining force at the front and rear intermediate portions of the airbag 12C.

Further, in the present embodiment, the internal pressures P2 and P4 of the one end side first sub chamber 20 and the one end side third sub chamber 23 located on the vehicle exterior side and the vehicle interior side are arranged on the one end side located in the center in the vehicle width direction. Since the pressure is lower than the internal pressure P3 of the second sub chamber 22, the one end side second sub chamber 22 expands in a hard state, and the one end side first sub chamber 20 and the one end side third sub chamber 23 expand in a soft state. .
Similarly, the internal pressures P5 and P7 of the other end side first sub chamber 24 and the other end side third sub chamber 27 located on the vehicle interior side and vehicle interior side are set to the other end side second position located at the center in the vehicle width direction. Since the pressure is lower than the internal pressure P6 of the sub chamber 26, the other end side second sub chamber 26 expands in a hard state, and the other end side first sub chamber 24 and the other end side third sub chamber 27 expands in a soft state. To do.
Therefore, when the impact energy applied to the occupant is relatively small, the occupant is in the one end side first sub chamber 20 and the one end side third sub chamber 23 or the other end side first sub chamber 24 and the other end side third sub chamber 27. Being caught softly and restrained.
Further, when the impact energy applied to the occupant is relatively large, the impact energy is surely restrained by the one end side second sub chamber 22 or the other end side second sub chamber 26.
Therefore, an appropriate restraining force corresponding to the magnitude of the impact energy applied to the occupant can be obtained while relaxing the impact force applied to the occupant from the airbag 12C.

In the present embodiment, the first outer cloth 36, the second outer cloth 38, the one end side main partition cloth 40, the two one end side sub partition cloths 42, the other end side main partition cloth 44, and the other two ends. While using the side sub-partition cloth 46, the one end side main partition cloth 40 is formed with three one end side openings 28, 30, 31 and the other end side main partition cloth 44 is provided with three other end side openings 32, 34, Since the air bag 12C can be manufactured with a simple configuration of forming the air flow 35, the configuration can be simplified and the degree of freedom in design can be improved as compared with the case of using a breathable panel that is restricted by the gas permeability. This is also advantageous for achieving this.
The size relationship between the area of the three one end side openings 28, 30, 31 and the area of the three other end openings 32, 34, 35 may be reversed from that of the embodiment, or the areas may be equal. May be. In those cases, the internal pressure P1 of the main chamber 18 is greater than the internal pressures P2, P3, P4 of the three one-end side sub-chambers 20, 22, 23, and the internal pressures of the three other-end side sub-chambers 24, 26, 27. Since it is larger than P5, P6, and P7, the restraint force required by the main chamber 18 is the largest as the restraint force required for each part of the airbag, and the three one-end side sub-chambers 20, 22, 23 or This is advantageous when it is required that the restraining force of the occupant by the three other-end side sub chambers 24, 26, 27 be lower than that of the main chamber 18.

(Fourth embodiment)
Next, a fourth embodiment will be described.
As shown in FIG. 7, in the fourth embodiment, in the deployed state, the airbag 12D has the main chamber 18, one end side first sub chamber 20, one end side second sub chamber 22, and one end side third sub chamber 23. This is different from the first embodiment in that the four chambers are provided. That is, in the fourth embodiment, the other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27 are removed from the third embodiment.
The main chamber 18 is provided in communication with the injection path 16.
The one end side first sub chamber 20, the one end side second sub chamber 22, and the one end side third sub chamber 23 are located in front of the main chamber 18.
The one end side first sub chamber 20, the one end side second sub chamber 22, and the one end side third sub chamber 23 are arranged in a direction connecting the vehicle interior and the outside of the vehicle interior, and the one end side first sub chamber 20 is arranged outside the vehicle interior. The one end side third sub chamber 23 is located on the vehicle interior side, and the one end side second sub chamber 22 is located between the one end side first sub chamber 20 and the one end side third sub chamber 23. ing.
The area of the one end side first opening portion 28 is equal to the area of the one end side third opening portion 31, and the area of the one end side second opening portion 30 is larger than the area of the one end side first opening portion 28.

The first outer cloth 36 is located in the entire region outside the passenger compartment of the airbag 12D in the deployed state, and the second outer cloth 38 is located in the entire region inside the passenger compartment of the airbag 12D in the deployed state.
The one-end-side main partition cloth 40 is in a deployed state, and the space between the first outer cloth 36 and the second outer cloth 38 is divided into the main chamber 18 and the one-end sub-chamber space 20A at the front and rear intermediate portions of the airbag 12D. The one end side main partition cloth 40 is sewn to the first outer cloth 36 and the second outer cloth 38, and extends in the diagonally up and down direction.
The two one-end-side sub-division cloths 42 divide the one-end-side sub-chamber space 20 </ b> A into three, ie, one-end-side first sub-chamber 20, one-end-side second sub-chamber 22, and one-end-side third sub-chamber 23. . Each one-end-side sub-partition cloth 42 extends from the intermediate portion in the width direction of the one-end-side main partition cloth 40 between the first outer cloth 36 and the second outer cloth 38, respectively, and the outer edges thereof are The one end side main partition cloth 40 and the mating surface of the first outer cloth 36 and the second outer cloth 38 are stitched together.
The one end side first opening 28, the one end side second opening 30, and the one end side third opening 31 are formed in the one end side main partition cloth 40.

Next, the function and effect of the fourth embodiment will be described.
In the event of a vehicle collision or rollover, when the inflator is activated and gas is supplied from the inlet to the injection path 16, the gas first flows into the main chamber 18, and then the three one-end openings 28, 30. , 31 to the three one-end side sub-chambers 20, 22, 23, respectively.
Since the three one-end-side openings 28, 30, and 31 have a gas flow passage area, the three one-end-side sub chambers 20, 22, and 23 are all inflated at an early stage, so that an air bag can be obtained at an early stage. The thickness of the entire 12D can be ensured.
Therefore, it is advantageous in sufficiently exhibiting the shock absorbing function by the airbag 12D.

Further, when the inflow of gas from the inflator to the airbag 12D is started, the internal pressure P1 of the main chamber 18 into which the gas first flows becomes the highest pressure, and then the one end side first sub chamber 20 into which the gas flows in, the one end side first The internal pressures P2 to P4 of the two sub chambers 22 and the one end side third sub chamber 23 are lower than the internal pressure P1 of the main chamber 18, and the internal pressure between the main chamber 18 and the three one end side sub chambers 20, 22, and 23. A difference occurs.
This internal pressure difference occurs during a period in which gas flows from the inflator to the airbag 12D. Eventually, the main chamber 18, the internal pressures P1 to P4 of the three one-end side sub-chambers 20, 22, and 23, and the pressure of the inflator When the gas flows into the airbag 12D from the inflator and the inflow is stopped, the internal pressure difference becomes zero.
Actually, the timing at which the airbag 12D receives the occupant is a period in which gas flows into the airbag 12D from the inflator. Therefore, the airbag 12D includes the main chamber 18, the three one-end side sub chambers 20, An occupant is received in a state where an internal pressure difference is occurring between 22 and 23.

Since the area of the one end side second opening 30 is larger than the areas of the one end side first opening 30 and the one end side third opening 31, the gas introduced from the main chamber 18 into the one end side second subchamber 22. The flow rate is higher than the flow rate of the gas introduced from the main chamber 18 into the one end side first sub chamber 20 and the one end side third sub chamber 23.
Therefore, the internal pressure P3 in the one end-side second sub chamber 22 is higher than the internal pressures P2, P4 in the one end side first sub chamber 20 and the one end side third sub chamber 23.
The magnitude relationship between these internal pressures is as follows.
P1>P3> P2 = P4

Therefore, the impact energy of the occupant that can be received by the main chamber 18 is the largest, and the impact energy of the occupant that can be received by the three one-end side sub chambers 20, 22, and 23 is lower than that of the main chamber 18.
In other words, the occupant's restraining force by the main chamber 18 is the largest, and the occupant's restraining force by the three one-end side sub-chambers 20, 22, 23 is lower than that of the main chamber 18.
Therefore, it is advantageous when the restraining force at the front portion of the airbag 12D is required to be lower than the restraining force due to the rear portion of the airbag 12D.

Further, in the present embodiment, the internal pressures P2 and P4 of the one end side first sub chamber 20 and the one end side third sub chamber 23 located on the vehicle exterior side and the vehicle interior side are arranged on the one end side located in the center in the vehicle width direction. Since the pressure is lower than the internal pressure P3 of the second sub chamber 22, the one end side second sub chamber 22 expands in a hard state, and the one end side first sub chamber 20 and the one end side third sub chamber 23 expand in a soft state. .
Therefore, when the impact energy applied to the occupant is relatively small, the occupant is softly received and restrained by the one end side first sub chamber 20 and the one end side third sub chamber 23.
Further, when the impact energy applied to the occupant is relatively large, the one-end-side second sub chamber 22 is surely restrained.
Therefore, it is possible to obtain an appropriate restraining force corresponding to the magnitude of the impact energy applied to the occupant while relaxing the impact force applied to the occupant from the airbag 12D.

In the present embodiment, the first outer cloth 36, the second outer cloth 38, the one end side main partition cloth 40, two one end side sub partition cloths 42 are used, and the one end side main partition cloth 40 has three one ends. Since the airbag 12D can be manufactured with a simple configuration in which the side openings 28, 30, and 31 are formed, the configuration can be simplified compared to the case of using a breathable panel that is restricted by the gas permeability. This is also advantageous for improving the degree of freedom of design.
The size relationship of the areas of the three one-end openings 28, 30, 31 may be reversed from that of the embodiment, or the areas may be equal. In those cases, the internal pressure P1 of the main chamber 18 is greater than the internal pressures P2, P3, P4 of the three one-end side sub-chambers 20, 22, 23, so that the restraint required corresponding to each part of the airbag is required. As the force, the occupant's restraining force by the main chamber 18 is the largest, which is advantageous when it is required to make the occupant's restraining force by the three one-end side sub-chambers 20, 22, 23 lower than that of the main chamber 18.

(Fifth embodiment)
Next, a fifth embodiment will be described.
The fifth embodiment is a modification of the first embodiment and the third embodiment, and is provided with two one-end side sub-chambers and three other-end side sub-chambers. Is different from the first embodiment and the third embodiment.
As shown in FIG. 8, in the third embodiment, in the deployed state, the airbag 12E has a main chamber 18 located at the center in the longitudinal direction of the airbag storage state, and a vehicle width adjacent to the front end of the main chamber 18. Two one-end side sub-chambers 20 and 22 arranged in the direction and three other-end side sub-chambers 24, 26, and 27 arranged adjacent to the rear end of the main chamber 18 in the vehicle width direction are provided.
The airbag 12E includes two one-end openings 28 and 30 that individually communicate the main chamber 18 and the two one-end sub-chambers 20 and 22, respectively, and the main chamber 18 and the three other-end sub-chambers 24. , 26, 27 are provided with three other end side openings 32, 34, 35 respectively communicating with each other.

The main chamber 18 is provided in communication with the injection path 16, and the main chamber 18 bulges and expands first when gas is injected.
The two one-end-side sub chambers 20 and 22 are the one-end-side first sub-chamber 20 and the one-end-side second sub-chamber 22, and the two one-end-side openings 28 and 30 are the one-end-side first opening 28 and one-end side. This is the second opening 30.
The other end side sub chambers 24, 26, 27 are the other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27. The openings 32, 34, and 35 are the other end-side first opening 32, the other end-side second opening 34, and the other end-side third opening 35.

The one end side first sub chamber 20 is located outside the vehicle compartment, the one end side third sub chamber 23 is located inside the vehicle compartment, and the area of the one end side first opening 28 is the same as that of the one end side second opening 30. Greater than area.
The other end side first sub chamber 24 is located outside the vehicle compartment, the other end side third sub chamber 27 is located inside the vehicle compartment, and the other end side second sub chamber 26 is the other end side first sub chamber. It is located between the chamber 20 and the third sub chamber 27 on the other end side.
The area of the other end side first opening 32 and the area of the other end side third opening 35 are equal, and the area of the other end side second opening 34 is larger than the area of the other end side first opening 32.

The airbag 12E includes a first outer cloth 36, a second outer cloth 38, one end side main partition cloth 40, one end side sub partition cloth 42, the other end side main partition cloth 44, and two other end side sub partitions. A cloth 46 is provided.
One end side of the space located inside the first outer cloth 36 and the second outer cloth 38 in the deployed state of the airbag 12E is positioned forward by the one end side main partition cloth 40 and the other end side main partition cloth 44. The sub-chamber space 20A, the main chamber 18 located behind the sub-chamber space 20A, and the other-end side sub-chamber space 24A located behind the sub-chamber space 20A are divided into three.

The two one-end-side sub-partition cloths 42 partition the one-end-side sub-chamber space 20 </ b> A into two one-end-side sub-chambers, one-end-side first sub-chamber 20 and one-end-side second sub-chamber 22.
The one end side first opening 28 and the one end side second opening 30 are formed in the one end side main partition cloth 40.
Further, the two other-end-side sub-partition cloths 46, the other-end-side sub-chamber space 24 </ b> A, the other-end-side first sub-chamber 24, the other-end-side second sub-chamber 26, and the other-end-side third sub-chamber 27. Are divided into three sub-chambers on the other end side.
The other end side first opening 32, the other end side second opening 34, and the other end side third opening 35 are formed in the other end side main partition cloth 44.

Next, the function and effect of the fifth embodiment will be described.
When the inflator is activated and the gas is supplied from the injection port to the injection path 16 in the event of a vehicle collision or rollover, the gas first flows into the main chamber 18 and then the two one-end openings 28 and 30. It flows into the two one end side sub chambers 20 and 22 and the three other end side sub chambers 24, 26 and 27 through the three other end side openings 32, 34 and 35, respectively.
Since the two one-end openings 28, 30 and the three other-end openings 32, 34, 35 have a gas flow passage area, the two one-end sub chambers 20, 22 and the three other ends Since all of the side sub chambers 24, 26 and 27 are inflated at an early stage, the thickness of the entire airbag 12E can be secured at an early stage.
Therefore, it is advantageous in sufficiently exhibiting the shock absorbing function by the airbag 12E.

Further, when the inflow of gas from the inflator to the airbag 12E is started, the internal pressure P1 of the main chamber 18 into which the gas first flows becomes the highest pressure, and then the one end side first sub chamber 20 into which the gas flows in, the one end side first The internal pressures P2 to P6 of the second sub chamber 22, the other end side first sub chamber 24, the other end side second sub chamber 26, and the other end side third sub chamber 27 are lower than the internal pressure P1 of the main chamber 18, and the main chamber An internal pressure difference is generated between 18 and the two one end side sub chambers 20 and 22 and the three other end side sub chambers 24, 26 and 27.
This internal pressure difference occurs during a period in which gas flows from the inflator to the airbag 12E. Eventually, the main chamber 18, the two one end side sub chambers 20, 22, and the three other end side sub chambers 24, 26, When the internal pressures P1 to P6 of 27 and the pressure of the inflator are balanced and the inflow of gas from the inflator to the airbag 12E stops, the internal pressure difference becomes zero.
Actually, the timing at which the airbag 12E receives the occupant is a period during which gas flows into the airbag 12E from the inflator. Therefore, the airbag 12E includes the main chamber 18, the two one-end side sub chambers 20, 22, the occupant is received in a state in which an internal pressure difference is generated between the three other end side sub chambers 24, 26, and 27.

Since the area of the one end side first opening portion 28 is larger than the area of the one end side second opening portion 30, the flow rate of the gas introduced from the main chamber 18 into the one end side first sub chamber 20 is one end side from the main chamber 18. More than the flow rate of the gas introduced into the second sub chamber 22.
Accordingly, the internal pressure P2 in the one end-side first sub chamber 20 is higher than the internal pressure P3 in the one end side second sub chamber 22.
Further, the area of the second opening 34 on the other end side is larger than the areas of the first opening 32 on the other end side and the third opening 35 on the other end side. The flow rate of the gas introduced into the main chamber 18 is larger than the flow rate of the gas introduced from the main chamber 18 into the other end side first sub chamber 24 and the other end side third sub chamber 27.
Therefore, the internal pressure P5 in the other end side second sub chamber 26 is higher than the internal pressures P4 and P6 in the other end side first sub chamber 24 and the other end side third sub chamber 27.
The magnitude relationship between these internal pressures is as follows.
P1>P2> P3, P1>P5> P4 = P6

Therefore, the impact energy of the occupant that can be received by the main chamber 18 is the largest, and the impact energy of the occupant that can be received by the two one-end side sub-chambers 20 and 22 and the three other-end side sub-chambers 24, 26, and 27. The impact energy of the occupant that can be received by the vehicle is lower than that of the main chamber 18.
In other words, the occupant's restraining force by the main chamber 18 is the largest, and the occupant's restraining force by the two one-end side sub-chambers 20 and 22 and the occupant's restraining force by the three other-end side sub-chambers 24, 26, and 27 It is lower than the chamber 18.
Therefore, it is advantageous when the restraining force at the front and rear portions of the airbag 12E is required to be lower than the restraining force at the front and rear intermediate portions of the airbag 12E.

Further, in the present embodiment, the internal pressure P3 of the one end side second sub chamber 22 on the vehicle interior side is set lower than the internal pressure P2 of the one end side first sub chamber 20 on the outside of the vehicle interior, so the one end side first sub chamber 20 expands in a hard state, and the one end side second sub chamber 22 expands in a soft state.
Further, the internal pressures P5 and P7 of the other end side first sub chamber 24 and the other end side third sub chamber 27 located on the vehicle exterior side and vehicle interior side are set to the other end side second sub chamber located in the center in the vehicle width direction. Since the internal pressure P6 is lower than the internal pressure P6 of the chamber 26, the other end side second sub chamber 26 expands in a hard state, and the other end side first sub chamber 24 and the other end side third sub chamber 27 expand in a soft state. .
Therefore, when the impact energy applied to the occupant is relatively small, the occupant is softly received and restrained by the one end side second sub chamber 22 or the other end side first sub chamber 24 and the other end side third sub chamber 27.
In addition, when the impact energy applied to the occupant is relatively large, the impact energy is surely restrained in the first sub chamber 20 on the one end side or the second sub chamber 26 on the other end side.
Therefore, an appropriate restraining force corresponding to the magnitude of impact energy applied to the occupant can be obtained while relaxing the impact force applied to the occupant from the airbag 12E.

In the present embodiment, the first outer cloth 36, the second outer cloth 38, the one end side main partition cloth 40, the one end side sub partition cloth 42, the other end side main partition cloth 44, and the other end of the two sheets. While using the side sub-partition cloth 46, the one end side main partition cloth 40 is formed with two one end side openings 28 and 30, and the other end side main partition cloth 44 is provided with three other end side openings 32, 34 and 35. Since the airbag 12E can be manufactured with a simple configuration of forming, the configuration can be simplified and the degree of freedom in design can be improved as compared with the case of using a breathable panel that is restricted by the gas permeability. This is also advantageous.
The size relationship between the area of the two one end side openings 28 and 30 and the area of the three other end side openings 32, 34 and 35 may be reversed from the embodiment, or the areas may be equalized. Also good. In those cases, the internal pressure P1 of the main chamber 18 is larger than the internal pressures P2 and P3 of the two one-end side sub-chambers 20 and 22, and the internal pressures P4, P5 of the three other-end side sub-chambers 24, 26, and 27, Since it is larger than P6, the restraining force of the occupant by the main chamber 18 is the largest as the restraining force required corresponding to each part of the airbag. This is advantageous when it is required that the restraining force of the occupant by the chambers 24, 26 and 27 be lower than that of the main chamber 18.

In addition, although embodiment demonstrated the case where the airbag 12 was the curtain airbag 12 which inflate-deploys below along the window part from the roof side part 6 above the front door 2, this invention is the following, for example It can also be applied to other airbags.
1) A curtain airbag in which the airbag 12 is inflated and deployed downward from the roof side portion 6 above the rear door along the window portion.
2) An airbag that bulges and expands upward along the window from a state in which the door trim under the window extends in the front-rear direction of the vehicle.
3) An airbag that bulges and expands rearward along the window from a state where it extends and is stored in the instrument panel in front of the driver's seat.
4) An airbag that bulges and deploys downward along the rear glass from a state in which it extends in the vehicle width direction and is stored above the rear glass.
5) An airbag that inflates and deploys forward or backward between the seat portions arranged in the vehicle width direction.
That is, the present invention is applicable to various conventionally known inflatable and deployable air bags regardless of the installation location, such as an airbag that is inflated and deployed in the front-rear direction of the vehicle from the stored state and an airbag that is inflated and deployed in the vehicle width direction from the stored state. Widely applicable to bags.
In the case of the airbags 1) and 2) above, the longitudinal direction of the airbag storage state is the longitudinal direction of the vehicle, and the first direction intersecting the longitudinal direction (the direction in which the airbag is inflated and deployed) ) Is a vertical direction, and a second direction (a direction in which a plurality of one-end side sub-chambers are arranged and a direction in which a plurality of other-end side sub-chambers are arranged) is a vehicle width direction.
In the case of the airbags 3) and 5) above, the longitudinal direction of the airbag storage state is the vertical direction, and the first direction intersecting the longitudinal direction (the direction in which the airbag is inflated and deployed) is The second direction (the direction in which the plurality of one-end side sub-chambers are arranged and the direction in which the plurality of one-end side sub-chambers are arranged) is the vehicle width direction, which is the vehicle front-rear direction and intersects the first direction.
In the case of the curtain airbag of 4), the longitudinal direction of the airbag storage state is the vehicle width direction, and the first direction intersecting the longitudinal direction (the direction in which the airbag is inflated and deployed) is The second direction (the direction in which the plurality of one-end side sub-chambers are arranged and the direction in which the plurality of one-end side sub-chambers are arranged) is the front-rear direction of the vehicle.

  2 ... Front door, 4 ... Roof side rail, 6 ... Roof side section, 10 ... Air bag device, 12A, 12B, 12C, 12D, 12E ... Air bag, 1202 ... Mounting piece, 14 ... Sleeve ... 16 ... Injection path, 18 ... Main chamber, 20 ... One end side first sub chamber, 22 ... One end side second sub chamber, 23 ... One end side third sub chamber, 24 ... Other end side First sub-chamber, 26 ... second sub-chamber at the other end, 27 ... third sub-chamber at the other end, 28 ... one end first opening, 30 ... one end second opening, 31 ... One end side third opening, 32 ... the other end side first opening, 34 ... the other end side second opening, 35 ... the other end side third opening, 36 ... the first outer cloth, 38 ... 2nd outer fabric, 40 ... one end side main partition fabric, 42 ... one end side sub partition fabric, 44 ... other end side main partition fabric, 46 ... other end side sub partition fabric, 48 ... Part.

Claims (6)

Air that is inflated and deployed in a first direction that intersects the longitudinal direction of the airbag storage state by injecting gas from the airbag storage state that is stored in a slender shape in the passenger compartment. A bag,
In the expanded state, a main chamber that swells when gas is injected into the injection port, and
A plurality of one-end-side sub-chambers arranged in a second direction adjacent to one end of the main chamber and intersecting the longitudinal direction and the first direction;
A plurality of one end side openings that individually communicate the main chamber and the plurality of one end side sub chambers;
An air bag comprising: The plurality of one end side sub chambers are two, one end side first sub chamber and one end side second sub chamber,
The plurality of openings include a first end first opening that communicates the main chamber with the first end first sub chamber, and a first end second opening that communicates the main chamber with the one end second sub chamber. Department,
The one end side first sub chamber is located outside the vehicle compartment, and the one end side second sub chamber is located inside the vehicle compartment,
The area of the one end side first opening is larger than the area of the one end side second opening,
The airbag according to claim 1. The plurality of one-end-side sub chambers are three, one end-side first sub-chamber, one end-side second sub-chamber, and one end-side third sub-chamber,
The plurality of openings include a first end first opening that communicates the main chamber with the first end first sub chamber, and a first end second opening that communicates the main chamber with the one end second sub chamber. A first end side third opening that communicates the portion with the main chamber and the one end side third sub chamber;
The one end side second sub chamber is located between the one end side first sub chamber and the one end side third sub chamber,
The area of the one end side first opening and the area of the one end side third opening are equal,
The area of the one end side second opening is larger than the area of the one end side first opening,
The airbag according to claim 1. A plurality of other-side sub chambers separated from the main chamber and arranged in the second direction at a location of the main chamber located on the opposite side of the one-end side sub-chamber in the deployed state;
A plurality of other end side openings that individually communicate the main chamber and the plurality of other end side sub chambers;
The airbag according to any one of claims 1 to 3, further comprising: In the deployed state, the first outer cloth and the second outer cloth that form the surface of the air bag opposite to each other, and the first outer cloth and the second outer cloth are stretched over the first outer cloth and the second outer cloth. One end side main partition cloth that divides the space between the two outer cloths into the main chamber and the one end side sub chamber space; and the first outer cloth and the second outer side from the one end side main partition cloth. One end side subpartition cloth extending between the cloth and partitioning the one end side subchamber space into the one end side first subchamber and the one end side second subchamber,
The one end side first opening and the one end side second opening are formed in the one end side main partition cloth,
The airbag according to claim 2. In the deployed state, the first outer cloth and the second outer cloth that form the surface of the air bag opposite to each other, and the first outer cloth and the second outer cloth are stretched over the first outer cloth and the second outer cloth. One end side main partition cloth that divides the space between the two outer cloths into the main chamber and the one end side sub chamber space; and the first outer cloth and the second outer side from the one end side main partition cloth. One end of two sheets extending at a distance from each other and partitioning the one end side sub chamber space into the one end side first sub chamber, the one end side second sub chamber, and the one end side third sub chamber A collateral partition cloth,
The one end side first opening, the one end side second opening, and the one end side third opening are formed in the one end side main partition cloth,
The airbag according to claim 3.

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